зеркало из https://github.com/mozilla/gecko-dev.git
5395 строки
203 KiB
C++
5395 строки
203 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* utility functions for drawing borders and backgrounds */
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#include <ctime>
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#include "gfx2DGlue.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/Helpers.h"
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#include "mozilla/gfx/PathHelpers.h"
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#include "mozilla/HashFunctions.h"
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#include "mozilla/MathAlgorithms.h"
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#include "nsStyleConsts.h"
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#include "nsPresContext.h"
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#include "nsIFrame.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "nsIPresShell.h"
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#include "nsFrameManager.h"
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#include "nsStyleContext.h"
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#include "nsGkAtoms.h"
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#include "nsCSSAnonBoxes.h"
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#include "nsIContent.h"
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#include "nsIDocumentInlines.h"
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#include "nsIScrollableFrame.h"
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#include "imgIRequest.h"
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#include "imgIContainer.h"
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#include "ImageOps.h"
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#include "nsCSSRendering.h"
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#include "nsCSSColorUtils.h"
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#include "nsITheme.h"
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#include "nsThemeConstants.h"
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#include "nsLayoutUtils.h"
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#include "nsBlockFrame.h"
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#include "gfxContext.h"
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#include "nsRenderingContext.h"
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#include "nsStyleStructInlines.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsCSSProps.h"
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#include "nsContentUtils.h"
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#include "nsSVGEffects.h"
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#include "nsSVGIntegrationUtils.h"
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#include "gfxDrawable.h"
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#include "GeckoProfiler.h"
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#include "nsCSSRenderingBorders.h"
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#include "mozilla/css/ImageLoader.h"
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#include "ImageContainer.h"
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#include "mozilla/Telemetry.h"
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#include "gfxUtils.h"
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#include "gfxColor.h"
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#include "gfxGradientCache.h"
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#include "GraphicsFilter.h"
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#include <algorithm>
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using namespace mozilla;
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using namespace mozilla::css;
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using namespace mozilla::gfx;
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using mozilla::image::ImageOps;
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using mozilla::CSSSizeOrRatio;
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static int gFrameTreeLockCount = 0;
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// To avoid storing this data on nsInlineFrame (bloat) and to avoid
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// recalculating this for each frame in a continuation (perf), hold
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// a cache of various coordinate information that we need in order
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// to paint inline backgrounds.
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struct InlineBackgroundData
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{
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InlineBackgroundData()
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: mFrame(nullptr), mBlockFrame(nullptr)
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{
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}
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~InlineBackgroundData()
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{
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}
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void Reset()
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{
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mBoundingBox.SetRect(0,0,0,0);
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mContinuationPoint = mLineContinuationPoint = mUnbrokenWidth = 0;
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mFrame = mBlockFrame = nullptr;
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mLeftBorderData.Reset();
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}
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/**
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* Return a continuous rect for (an inline) aFrame relative to the
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* continuation that draws the left-most part of the background.
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* This is used when painting backgrounds.
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*/
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nsRect GetContinuousRect(nsIFrame* aFrame)
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{
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MOZ_ASSERT(aFrame->GetType() == nsGkAtoms::inlineFrame);
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SetFrame(aFrame);
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nscoord x;
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if (mBidiEnabled) {
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x = mLineContinuationPoint;
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// Scan continuations on the same line as aFrame and accumulate the widths
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// of frames that are to the left (if this is an LTR block) or right
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// (if it's RTL) of the current one.
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bool isRtlBlock = (mBlockFrame->StyleVisibility()->mDirection ==
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NS_STYLE_DIRECTION_RTL);
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nscoord curOffset = aFrame->GetOffsetTo(mBlockFrame).x;
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// If the continuation is fluid we know inlineFrame is not on the same line.
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// If it's not fluid, we need to test further to be sure.
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nsIFrame* inlineFrame = aFrame->GetPrevContinuation();
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while (inlineFrame && !inlineFrame->GetNextInFlow() &&
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AreOnSameLine(aFrame, inlineFrame)) {
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nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
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if(isRtlBlock == (frameXOffset >= curOffset)) {
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x += inlineFrame->GetSize().width;
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}
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inlineFrame = inlineFrame->GetPrevContinuation();
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}
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inlineFrame = aFrame->GetNextContinuation();
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while (inlineFrame && !inlineFrame->GetPrevInFlow() &&
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AreOnSameLine(aFrame, inlineFrame)) {
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nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
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if(isRtlBlock == (frameXOffset >= curOffset)) {
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x += inlineFrame->GetSize().width;
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}
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inlineFrame = inlineFrame->GetNextContinuation();
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}
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if (isRtlBlock) {
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// aFrame itself is also to the right of its left edge, so add its width.
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x += aFrame->GetSize().width;
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// x is now the distance from the left edge of aFrame to the right edge
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// of the unbroken content. Change it to indicate the distance from the
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// left edge of the unbroken content to the left edge of aFrame.
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x = mUnbrokenWidth - x;
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}
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} else {
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x = mContinuationPoint;
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}
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// Assume background-origin: border and return a rect with offsets
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// relative to (0,0). If we have a different background-origin,
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// then our rect should be deflated appropriately by our caller.
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return nsRect(-x, 0, mUnbrokenWidth, mFrame->GetSize().height);
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}
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/**
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* Return a continuous rect for (an inline) aFrame relative to the
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* continuation that should draw the left-border. This is used when painting
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* borders and clipping backgrounds. This may NOT be the same continuous rect
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* as for drawing backgrounds; the continuation with the left-border might be
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* somewhere in the middle of that rect (e.g. BIDI), in those cases we need
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* the reverse background order starting at the left-border continuation.
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*/
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nsRect GetBorderContinuousRect(nsIFrame* aFrame, nsRect aBorderArea)
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{
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// Calling GetContinuousRect(aFrame) here may lead to Reset/Init which
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// resets our mLeftBorderData so we save it ...
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LeftBorderData saved(mLeftBorderData);
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nsRect joinedBorderArea = GetContinuousRect(aFrame);
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if (!saved.mIsValid || saved.mFrame != mLeftBorderData.mFrame) {
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if (aFrame == mLeftBorderData.mFrame) {
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mLeftBorderData.SetX(joinedBorderArea.x);
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} else if (mLeftBorderData.mFrame) {
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mLeftBorderData.SetX(GetContinuousRect(mLeftBorderData.mFrame).x);
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}
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} else {
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// ... and restore it when possible.
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mLeftBorderData.mX = saved.mX;
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}
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if (joinedBorderArea.x > mLeftBorderData.mX) {
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joinedBorderArea.x =
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-(mUnbrokenWidth + joinedBorderArea.x - aBorderArea.width);
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} else {
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joinedBorderArea.x -= mLeftBorderData.mX;
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}
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return joinedBorderArea;
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}
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nsRect GetBoundingRect(nsIFrame* aFrame)
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{
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SetFrame(aFrame);
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// Move the offsets relative to (0,0) which puts the bounding box into
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// our coordinate system rather than our parent's. We do this by
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// moving it the back distance from us to the bounding box.
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// This also assumes background-origin: border, so our caller will
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// need to deflate us if needed.
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nsRect boundingBox(mBoundingBox);
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nsPoint point = mFrame->GetPosition();
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boundingBox.MoveBy(-point.x, -point.y);
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return boundingBox;
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}
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protected:
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struct LeftBorderData {
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nsIFrame* mFrame; // the continuation that may have a left-border
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nscoord mX; // cached GetContinuousRect(mFrame).x
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bool mIsValid; // true if mX is valid
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void Reset() { mFrame = nullptr; mIsValid = false; }
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void SetX(nscoord aX) { mX = aX; mIsValid = true; }
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};
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nsIFrame* mFrame;
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nsBlockFrame* mBlockFrame;
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nsRect mBoundingBox;
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nscoord mContinuationPoint;
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nscoord mUnbrokenWidth;
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nscoord mLineContinuationPoint;
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LeftBorderData mLeftBorderData;
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bool mBidiEnabled;
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void SetFrame(nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "Need a frame");
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NS_ASSERTION(gFrameTreeLockCount > 0,
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"Can't call this when frame tree is not locked");
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if (aFrame == mFrame) {
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return;
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}
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nsIFrame *prevContinuation = GetPrevContinuation(aFrame);
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if (!prevContinuation || mFrame != prevContinuation) {
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// Ok, we've got the wrong frame. We have to start from scratch.
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Reset();
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Init(aFrame);
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return;
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}
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// Get our last frame's size and add its width to our continuation
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// point before we cache the new frame.
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mContinuationPoint += mFrame->GetSize().width;
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// If this a new line, update mLineContinuationPoint.
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if (mBidiEnabled &&
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(aFrame->GetPrevInFlow() || !AreOnSameLine(mFrame, aFrame))) {
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mLineContinuationPoint = mContinuationPoint;
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}
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mFrame = aFrame;
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}
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nsIFrame* GetPrevContinuation(nsIFrame* aFrame)
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{
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nsIFrame* prevCont = aFrame->GetPrevContinuation();
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if (!prevCont &&
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(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
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nsIFrame* block = static_cast<nsIFrame*>
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(aFrame->Properties().Get(nsIFrame::IBSplitPrevSibling()));
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if (block) {
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// The {ib} properties are only stored on first continuations
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NS_ASSERTION(!block->GetPrevContinuation(),
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"Incorrect value for IBSplitPrevSibling");
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prevCont = static_cast<nsIFrame*>
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(block->Properties().Get(nsIFrame::IBSplitPrevSibling()));
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NS_ASSERTION(prevCont, "How did that happen?");
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}
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}
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return prevCont;
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}
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nsIFrame* GetNextContinuation(nsIFrame* aFrame)
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{
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nsIFrame* nextCont = aFrame->GetNextContinuation();
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if (!nextCont &&
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(aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT)) {
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// The {ib} properties are only stored on first continuations
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aFrame = aFrame->FirstContinuation();
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nsIFrame* block = static_cast<nsIFrame*>
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(aFrame->Properties().Get(nsIFrame::IBSplitSibling()));
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if (block) {
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nextCont = static_cast<nsIFrame*>
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(block->Properties().Get(nsIFrame::IBSplitSibling()));
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NS_ASSERTION(nextCont, "How did that happen?");
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}
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}
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return nextCont;
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}
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void Init(nsIFrame* aFrame)
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{
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mLeftBorderData.Reset();
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mBidiEnabled = aFrame->PresContext()->BidiEnabled();
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if (mBidiEnabled) {
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// Find the containing block frame
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nsIFrame* frame = aFrame;
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do {
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frame = frame->GetParent();
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mBlockFrame = do_QueryFrame(frame);
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}
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while (frame && frame->IsFrameOfType(nsIFrame::eLineParticipant));
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NS_ASSERTION(mBlockFrame, "Cannot find containing block.");
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}
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// Start with the previous flow frame as our continuation point
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// is the total of the widths of the previous frames.
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nsIFrame* inlineFrame = GetPrevContinuation(aFrame);
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while (inlineFrame) {
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if (!mLeftBorderData.mFrame &&
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!inlineFrame->GetSkipSides().Left()) {
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mLeftBorderData.mFrame = inlineFrame;
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}
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nsRect rect = inlineFrame->GetRect();
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mContinuationPoint += rect.width;
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if (mBidiEnabled && !AreOnSameLine(aFrame, inlineFrame)) {
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mLineContinuationPoint += rect.width;
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}
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mUnbrokenWidth += rect.width;
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mBoundingBox.UnionRect(mBoundingBox, rect);
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inlineFrame = GetPrevContinuation(inlineFrame);
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}
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// Next add this frame and subsequent frames to the bounding box and
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// unbroken width.
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inlineFrame = aFrame;
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while (inlineFrame) {
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if (!mLeftBorderData.mFrame &&
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!inlineFrame->GetSkipSides().Left()) {
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mLeftBorderData.mFrame = inlineFrame;
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}
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nsRect rect = inlineFrame->GetRect();
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mUnbrokenWidth += rect.width;
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mBoundingBox.UnionRect(mBoundingBox, rect);
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inlineFrame = GetNextContinuation(inlineFrame);
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}
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mFrame = aFrame;
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}
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bool AreOnSameLine(nsIFrame* aFrame1, nsIFrame* aFrame2) {
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bool isValid1, isValid2;
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nsBlockInFlowLineIterator it1(mBlockFrame, aFrame1, &isValid1);
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nsBlockInFlowLineIterator it2(mBlockFrame, aFrame2, &isValid2);
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return isValid1 && isValid2 &&
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// Make sure aFrame1 and aFrame2 are in the same continuation of
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// mBlockFrame.
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it1.GetContainer() == it2.GetContainer() &&
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// And on the same line in it
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it1.GetLine() == it2.GetLine();
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}
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};
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// A resolved color stop --- with a specific position along the gradient line,
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// and a Thebes color
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struct ColorStop {
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ColorStop(): mPosition(0), mIsMidpoint(false) {}
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ColorStop(double aPosition, bool aIsMidPoint, gfxRGBA aColor) :
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mPosition(aPosition), mIsMidpoint(aIsMidPoint), mColor(aColor) {}
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double mPosition; // along the gradient line; 0=start, 1=end
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bool mIsMidpoint;
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gfxRGBA mColor;
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};
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/* Local functions */
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static void DrawBorderImage(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aBorderArea,
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const nsStyleBorder& aStyleBorder,
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const nsRect& aDirtyRect,
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Sides aSkipSides);
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static nscolor MakeBevelColor(mozilla::css::Side whichSide, uint8_t style,
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nscolor aBackgroundColor,
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nscolor aBorderColor);
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static InlineBackgroundData* gInlineBGData = nullptr;
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// Initialize any static variables used by nsCSSRendering.
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void nsCSSRendering::Init()
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{
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NS_ASSERTION(!gInlineBGData, "Init called twice");
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gInlineBGData = new InlineBackgroundData();
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}
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// Clean up any global variables used by nsCSSRendering.
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void nsCSSRendering::Shutdown()
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{
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delete gInlineBGData;
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gInlineBGData = nullptr;
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}
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/**
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* Make a bevel color
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*/
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static nscolor
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MakeBevelColor(mozilla::css::Side whichSide, uint8_t style,
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nscolor aBackgroundColor, nscolor aBorderColor)
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{
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nscolor colors[2];
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nscolor theColor;
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// Given a background color and a border color
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// calculate the color used for the shading
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NS_GetSpecial3DColors(colors, aBackgroundColor, aBorderColor);
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if ((style == NS_STYLE_BORDER_STYLE_OUTSET) ||
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(style == NS_STYLE_BORDER_STYLE_RIDGE)) {
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// Flip colors for these two border styles
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switch (whichSide) {
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case NS_SIDE_BOTTOM: whichSide = NS_SIDE_TOP; break;
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case NS_SIDE_RIGHT: whichSide = NS_SIDE_LEFT; break;
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case NS_SIDE_TOP: whichSide = NS_SIDE_BOTTOM; break;
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case NS_SIDE_LEFT: whichSide = NS_SIDE_RIGHT; break;
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}
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}
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switch (whichSide) {
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case NS_SIDE_BOTTOM:
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theColor = colors[1];
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break;
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case NS_SIDE_RIGHT:
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theColor = colors[1];
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break;
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case NS_SIDE_TOP:
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theColor = colors[0];
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break;
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case NS_SIDE_LEFT:
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default:
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theColor = colors[0];
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break;
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}
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return theColor;
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}
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static bool
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GetRadii(nsIFrame* aForFrame, const nsStyleBorder& aBorder,
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const nsRect& aOrigBorderArea, const nsRect& aBorderArea,
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nscoord aRadii[8])
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{
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bool haveRoundedCorners;
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nsSize sz = aBorderArea.Size();
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nsSize frameSize = aForFrame->GetSize();
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if (&aBorder == aForFrame->StyleBorder() &&
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frameSize == aOrigBorderArea.Size()) {
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haveRoundedCorners = aForFrame->GetBorderRadii(sz, sz, Sides(), aRadii);
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} else {
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haveRoundedCorners =
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nsIFrame::ComputeBorderRadii(aBorder.mBorderRadius, frameSize, sz, Sides(), aRadii);
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}
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return haveRoundedCorners;
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}
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static bool
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GetRadii(nsIFrame* aForFrame, const nsStyleBorder& aBorder,
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const nsRect& aOrigBorderArea, const nsRect& aBorderArea,
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RectCornerRadii* aBgRadii)
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{
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nscoord radii[8];
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bool haveRoundedCorners = GetRadii(aForFrame, aBorder, aOrigBorderArea, aBorderArea, radii);
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if (haveRoundedCorners) {
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auto d2a = aForFrame->PresContext()->AppUnitsPerDevPixel();
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nsCSSRendering::ComputePixelRadii(radii, d2a, aBgRadii);
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}
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return haveRoundedCorners;
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}
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static nsRect
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JoinBoxesForVerticalSlice(nsIFrame* aFrame, const nsRect& aBorderArea)
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{
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// Inflate vertically as if our continuations were laid out vertically
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// adjacent. Note that we don't touch the width.
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nsRect borderArea = aBorderArea;
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nscoord h = 0;
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nsIFrame* f = aFrame->GetNextContinuation();
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for (; f; f = f->GetNextContinuation()) {
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MOZ_ASSERT(!(f->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT),
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"anonymous ib-split block shouldn't have border/background");
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h += f->GetRect().height;
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}
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borderArea.height += h;
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h = 0;
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f = aFrame->GetPrevContinuation();
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for (; f; f = f->GetPrevContinuation()) {
|
||
MOZ_ASSERT(!(f->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT),
|
||
"anonymous ib-split block shouldn't have border/background");
|
||
h += f->GetRect().height;
|
||
}
|
||
borderArea.y -= h;
|
||
borderArea.height += h;
|
||
return borderArea;
|
||
}
|
||
|
||
/**
|
||
* Inflate aBorderArea which is relative to aFrame's origin to calculate
|
||
* a hypothetical non-split frame area for all the continuations.
|
||
* See "Joining Boxes for 'slice'" in
|
||
* http://dev.w3.org/csswg/css-break/#break-decoration
|
||
*/
|
||
enum InlineBoxOrder { eForBorder, eForBackground };
|
||
static nsRect
|
||
JoinBoxesForSlice(nsIFrame* aFrame, const nsRect& aBorderArea,
|
||
InlineBoxOrder aOrder)
|
||
{
|
||
if (aFrame->GetType() == nsGkAtoms::inlineFrame) {
|
||
return (aOrder == eForBorder
|
||
? gInlineBGData->GetBorderContinuousRect(aFrame, aBorderArea)
|
||
: gInlineBGData->GetContinuousRect(aFrame)) +
|
||
aBorderArea.TopLeft();
|
||
}
|
||
return JoinBoxesForVerticalSlice(aFrame, aBorderArea);
|
||
}
|
||
|
||
static bool
|
||
IsBoxDecorationSlice(const nsStyleBorder& aStyleBorder)
|
||
{
|
||
return aStyleBorder.mBoxDecorationBreak ==
|
||
NS_STYLE_BOX_DECORATION_BREAK_SLICE;
|
||
}
|
||
|
||
static nsRect
|
||
BoxDecorationRectForBorder(nsIFrame* aFrame, const nsRect& aBorderArea,
|
||
Sides aSkipSides,
|
||
const nsStyleBorder* aStyleBorder = nullptr)
|
||
{
|
||
if (!aStyleBorder) {
|
||
aStyleBorder = aFrame->StyleBorder();
|
||
}
|
||
// If aSkipSides.IsEmpty() then there are no continuations, or it's
|
||
// a ::first-letter that wants all border sides on the first continuation.
|
||
return ::IsBoxDecorationSlice(*aStyleBorder) && !aSkipSides.IsEmpty()
|
||
? ::JoinBoxesForSlice(aFrame, aBorderArea, eForBorder)
|
||
: aBorderArea;
|
||
}
|
||
|
||
static nsRect
|
||
BoxDecorationRectForBackground(nsIFrame* aFrame, const nsRect& aBorderArea,
|
||
Sides aSkipSides,
|
||
const nsStyleBorder* aStyleBorder = nullptr)
|
||
{
|
||
if (!aStyleBorder) {
|
||
aStyleBorder = aFrame->StyleBorder();
|
||
}
|
||
// If aSkipSides.IsEmpty() then there are no continuations, or it's
|
||
// a ::first-letter that wants all border sides on the first continuation.
|
||
return ::IsBoxDecorationSlice(*aStyleBorder) && !aSkipSides.IsEmpty()
|
||
? ::JoinBoxesForSlice(aFrame, aBorderArea, eForBackground)
|
||
: aBorderArea;
|
||
}
|
||
|
||
//----------------------------------------------------------------------
|
||
// Thebes Border Rendering Code Start
|
||
|
||
/*
|
||
* Compute the float-pixel radii that should be used for drawing
|
||
* this border/outline, given the various input bits.
|
||
*/
|
||
/* static */ void
|
||
nsCSSRendering::ComputePixelRadii(const nscoord *aAppUnitsRadii,
|
||
nscoord aAppUnitsPerPixel,
|
||
RectCornerRadii *oBorderRadii)
|
||
{
|
||
Float radii[8];
|
||
NS_FOR_CSS_HALF_CORNERS(corner)
|
||
radii[corner] = Float(aAppUnitsRadii[corner]) / aAppUnitsPerPixel;
|
||
|
||
(*oBorderRadii)[C_TL] = Size(radii[NS_CORNER_TOP_LEFT_X],
|
||
radii[NS_CORNER_TOP_LEFT_Y]);
|
||
(*oBorderRadii)[C_TR] = Size(radii[NS_CORNER_TOP_RIGHT_X],
|
||
radii[NS_CORNER_TOP_RIGHT_Y]);
|
||
(*oBorderRadii)[C_BR] = Size(radii[NS_CORNER_BOTTOM_RIGHT_X],
|
||
radii[NS_CORNER_BOTTOM_RIGHT_Y]);
|
||
(*oBorderRadii)[C_BL] = Size(radii[NS_CORNER_BOTTOM_LEFT_X],
|
||
radii[NS_CORNER_BOTTOM_LEFT_Y]);
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBorder(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aBorderArea,
|
||
nsStyleContext* aStyleContext,
|
||
Sides aSkipSides)
|
||
{
|
||
PROFILER_LABEL("nsCSSRendering", "PaintBorder",
|
||
js::ProfileEntry::Category::GRAPHICS);
|
||
|
||
nsStyleContext *styleIfVisited = aStyleContext->GetStyleIfVisited();
|
||
const nsStyleBorder *styleBorder = aStyleContext->StyleBorder();
|
||
// Don't check RelevantLinkVisited here, since we want to take the
|
||
// same amount of time whether or not it's true.
|
||
if (!styleIfVisited) {
|
||
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
|
||
aDirtyRect, aBorderArea, *styleBorder,
|
||
aStyleContext, aSkipSides);
|
||
return;
|
||
}
|
||
|
||
nsStyleBorder newStyleBorder(*styleBorder);
|
||
// We could do something fancy to avoid the TrackImage/UntrackImage
|
||
// work, but it doesn't seem worth it. (We need to call TrackImage
|
||
// since we're not going through nsRuleNode::ComputeBorderData.)
|
||
newStyleBorder.TrackImage(aPresContext);
|
||
|
||
NS_FOR_CSS_SIDES(side) {
|
||
newStyleBorder.SetBorderColor(side,
|
||
aStyleContext->GetVisitedDependentColor(
|
||
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color)[side]));
|
||
}
|
||
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
|
||
aDirtyRect, aBorderArea, newStyleBorder,
|
||
aStyleContext, aSkipSides);
|
||
|
||
// We could do something fancy to avoid the TrackImage/UntrackImage
|
||
// work, but it doesn't seem worth it. (We need to call UntrackImage
|
||
// since we're not going through nsStyleBorder::Destroy.)
|
||
newStyleBorder.UntrackImage(aPresContext);
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aBorderArea,
|
||
const nsStyleBorder& aStyleBorder,
|
||
nsStyleContext* aStyleContext,
|
||
Sides aSkipSides)
|
||
{
|
||
PrintAsStringNewline("++ PaintBorder");
|
||
|
||
// Check to see if we have an appearance defined. If so, we let the theme
|
||
// renderer draw the border. DO not get the data from aForFrame, since the passed in style context
|
||
// may be different! Always use |aStyleContext|!
|
||
const nsStyleDisplay* displayData = aStyleContext->StyleDisplay();
|
||
if (displayData->mAppearance) {
|
||
nsITheme *theme = aPresContext->GetTheme();
|
||
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame, displayData->mAppearance))
|
||
return; // Let the theme handle it.
|
||
}
|
||
|
||
if (aStyleBorder.IsBorderImageLoaded()) {
|
||
DrawBorderImage(aPresContext, aRenderingContext, aForFrame,
|
||
aBorderArea, aStyleBorder, aDirtyRect, aSkipSides);
|
||
return;
|
||
}
|
||
|
||
// Get our style context's color struct.
|
||
const nsStyleColor* ourColor = aStyleContext->StyleColor();
|
||
|
||
// In NavQuirks mode we want to use the parent's context as a starting point
|
||
// for determining the background color.
|
||
bool quirks = aPresContext->CompatibilityMode() == eCompatibility_NavQuirks;
|
||
nsIFrame* bgFrame = FindNonTransparentBackgroundFrame(aForFrame, quirks);
|
||
nsStyleContext* bgContext = bgFrame->StyleContext();
|
||
nscolor bgColor =
|
||
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
|
||
|
||
nsMargin border = aStyleBorder.GetComputedBorder();
|
||
if (0 == border.left && 0 == border.right &&
|
||
0 == border.top && 0 == border.bottom) {
|
||
// Empty border area
|
||
return;
|
||
}
|
||
|
||
// Compute the outermost boundary of the area that might be painted.
|
||
// Same coordinate space as aBorderArea & aBGClipRect.
|
||
nsRect joinedBorderArea =
|
||
::BoxDecorationRectForBorder(aForFrame, aBorderArea, aSkipSides, &aStyleBorder);
|
||
RectCornerRadii bgRadii;
|
||
::GetRadii(aForFrame, aStyleBorder, aBorderArea, joinedBorderArea, &bgRadii);
|
||
|
||
PrintAsFormatString(" joinedBorderArea: %d %d %d %d\n", joinedBorderArea.x, joinedBorderArea.y,
|
||
joinedBorderArea.width, joinedBorderArea.height);
|
||
|
||
// start drawing
|
||
gfxContext* ctx = aRenderingContext.ThebesContext();
|
||
ctx->Save();
|
||
|
||
if (::IsBoxDecorationSlice(aStyleBorder)) {
|
||
if (joinedBorderArea.IsEqualEdges(aBorderArea)) {
|
||
// No need for a clip, just skip the sides we don't want.
|
||
border.ApplySkipSides(aSkipSides);
|
||
} else {
|
||
// We're drawing borders around the joined continuation boxes so we need
|
||
// to clip that to the slice that we want for this frame.
|
||
aRenderingContext.ThebesContext()->
|
||
Clip(NSRectToSnappedRect(aBorderArea,
|
||
aForFrame->PresContext()->AppUnitsPerDevPixel(),
|
||
*aRenderingContext.GetDrawTarget()));
|
||
}
|
||
} else {
|
||
MOZ_ASSERT(joinedBorderArea.IsEqualEdges(aBorderArea),
|
||
"Should use aBorderArea for box-decoration-break:clone");
|
||
MOZ_ASSERT(aForFrame->GetSkipSides().IsEmpty(),
|
||
"Should not skip sides for box-decoration-break:clone except "
|
||
"::first-letter/line continuations or other frame types that "
|
||
"don't have borders but those shouldn't reach this point.");
|
||
}
|
||
|
||
// Convert to dev pixels.
|
||
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
|
||
Rect joinedBorderAreaPx = NSRectToRect(joinedBorderArea, twipsPerPixel);
|
||
Float borderWidths[4] = { Float(border.top / twipsPerPixel),
|
||
Float(border.right / twipsPerPixel),
|
||
Float(border.bottom / twipsPerPixel),
|
||
Float(border.left / twipsPerPixel) };
|
||
|
||
uint8_t borderStyles[4];
|
||
nscolor borderColors[4];
|
||
nsBorderColors *compositeColors[4];
|
||
|
||
// pull out styles, colors, composite colors
|
||
NS_FOR_CSS_SIDES (i) {
|
||
bool foreground;
|
||
borderStyles[i] = aStyleBorder.GetBorderStyle(i);
|
||
aStyleBorder.GetBorderColor(i, borderColors[i], foreground);
|
||
aStyleBorder.GetCompositeColors(i, &compositeColors[i]);
|
||
|
||
if (foreground)
|
||
borderColors[i] = ourColor->mColor;
|
||
}
|
||
|
||
PrintAsFormatString(" borderStyles: %d %d %d %d\n", borderStyles[0], borderStyles[1], borderStyles[2], borderStyles[3]);
|
||
//PrintAsFormatString ("bgRadii: %f %f %f %f\n", bgRadii[0], bgRadii[1], bgRadii[2], bgRadii[3]);
|
||
|
||
#if 0
|
||
// this will draw a transparent red backround underneath the border area
|
||
ctx->Save();
|
||
ctx->Rectangle(ThebesRect(joinedBorderAreaPx));
|
||
ctx->SetColor(gfxRGBA(1.0, 0.0, 0.0, 0.5));
|
||
ctx->Fill();
|
||
ctx->Restore();
|
||
#endif
|
||
|
||
nsCSSBorderRenderer br(ctx->GetDrawTarget(),
|
||
joinedBorderAreaPx,
|
||
borderStyles,
|
||
borderWidths,
|
||
bgRadii,
|
||
borderColors,
|
||
compositeColors,
|
||
bgColor);
|
||
br.DrawBorders();
|
||
|
||
ctx->Restore();
|
||
|
||
PrintAsStringNewline();
|
||
}
|
||
|
||
static nsRect
|
||
GetOutlineInnerRect(nsIFrame* aFrame)
|
||
{
|
||
nsRect* savedOutlineInnerRect = static_cast<nsRect*>
|
||
(aFrame->Properties().Get(nsIFrame::OutlineInnerRectProperty()));
|
||
if (savedOutlineInnerRect)
|
||
return *savedOutlineInnerRect;
|
||
NS_NOTREACHED("we should have saved a frame property");
|
||
return nsRect(nsPoint(0, 0), aFrame->GetSize());
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aBorderArea,
|
||
nsStyleContext* aStyleContext)
|
||
{
|
||
nscoord twipsRadii[8];
|
||
|
||
// Get our style context's color struct.
|
||
const nsStyleOutline* ourOutline = aStyleContext->StyleOutline();
|
||
MOZ_ASSERT(ourOutline != NS_STYLE_BORDER_STYLE_NONE,
|
||
"shouldn't have created nsDisplayOutline item");
|
||
|
||
uint8_t outlineStyle = ourOutline->GetOutlineStyle();
|
||
nscoord width;
|
||
ourOutline->GetOutlineWidth(width);
|
||
|
||
if (width == 0 && outlineStyle != NS_STYLE_BORDER_STYLE_AUTO) {
|
||
// Empty outline
|
||
return;
|
||
}
|
||
|
||
nsIFrame* bgFrame = nsCSSRendering::FindNonTransparentBackgroundFrame
|
||
(aForFrame, false);
|
||
nsStyleContext* bgContext = bgFrame->StyleContext();
|
||
nscolor bgColor =
|
||
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
|
||
|
||
nsRect innerRect;
|
||
if (
|
||
#ifdef MOZ_XUL
|
||
aStyleContext->GetPseudoType() == nsCSSPseudoElements::ePseudo_XULTree
|
||
#else
|
||
false
|
||
#endif
|
||
) {
|
||
innerRect = aBorderArea;
|
||
} else {
|
||
innerRect = GetOutlineInnerRect(aForFrame) + aBorderArea.TopLeft();
|
||
}
|
||
nscoord offset = ourOutline->mOutlineOffset;
|
||
innerRect.Inflate(offset, offset);
|
||
// If the dirty rect is completely inside the border area (e.g., only the
|
||
// content is being painted), then we can skip out now
|
||
// XXX this isn't exactly true for rounded borders, where the inside curves may
|
||
// encroach into the content area. A safer calculation would be to
|
||
// shorten insideRect by the radius one each side before performing this test.
|
||
if (innerRect.Contains(aDirtyRect))
|
||
return;
|
||
|
||
nsRect outerRect = innerRect;
|
||
outerRect.Inflate(width, width);
|
||
|
||
// get the radius for our outline
|
||
nsIFrame::ComputeBorderRadii(ourOutline->mOutlineRadius, aBorderArea.Size(),
|
||
outerRect.Size(), Sides(), twipsRadii);
|
||
|
||
// Get our conversion values
|
||
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
|
||
|
||
// get the outer rectangles
|
||
Rect oRect(NSRectToRect(outerRect, twipsPerPixel));
|
||
|
||
// convert the radii
|
||
nsMargin outlineMargin(width, width, width, width);
|
||
RectCornerRadii outlineRadii;
|
||
ComputePixelRadii(twipsRadii, twipsPerPixel, &outlineRadii);
|
||
|
||
if (nsLayoutUtils::IsOutlineStyleAutoEnabled()) {
|
||
if (outlineStyle == NS_STYLE_BORDER_STYLE_AUTO) {
|
||
nsITheme* theme = aPresContext->GetTheme();
|
||
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame,
|
||
NS_THEME_FOCUS_OUTLINE)) {
|
||
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
|
||
NS_THEME_FOCUS_OUTLINE, innerRect,
|
||
aDirtyRect);
|
||
return;
|
||
} else if (width == 0) {
|
||
return; // empty outline
|
||
}
|
||
// http://dev.w3.org/csswg/css-ui/#outline
|
||
// "User agents may treat 'auto' as 'solid'."
|
||
outlineStyle = NS_STYLE_BORDER_STYLE_SOLID;
|
||
}
|
||
}
|
||
|
||
uint8_t outlineStyles[4] = { outlineStyle, outlineStyle,
|
||
outlineStyle, outlineStyle };
|
||
|
||
// This handles treating the initial color as 'currentColor'; if we
|
||
// ever want 'invert' back we'll need to do a bit of work here too.
|
||
nscolor outlineColor =
|
||
aStyleContext->GetVisitedDependentColor(eCSSProperty_outline_color);
|
||
nscolor outlineColors[4] = { outlineColor,
|
||
outlineColor,
|
||
outlineColor,
|
||
outlineColor };
|
||
|
||
// convert the border widths
|
||
Float outlineWidths[4] = { Float(width / twipsPerPixel),
|
||
Float(width / twipsPerPixel),
|
||
Float(width / twipsPerPixel),
|
||
Float(width / twipsPerPixel) };
|
||
|
||
// start drawing
|
||
gfxContext *ctx = aRenderingContext.ThebesContext();
|
||
|
||
nsCSSBorderRenderer br(ctx->GetDrawTarget(),
|
||
oRect,
|
||
outlineStyles,
|
||
outlineWidths,
|
||
outlineRadii,
|
||
outlineColors,
|
||
nullptr,
|
||
bgColor);
|
||
br.DrawBorders();
|
||
|
||
PrintAsStringNewline();
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintFocus(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
const nsRect& aFocusRect,
|
||
nscolor aColor)
|
||
{
|
||
nscoord oneCSSPixel = nsPresContext::CSSPixelsToAppUnits(1);
|
||
nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
|
||
|
||
Rect focusRect(NSRectToRect(aFocusRect, oneDevPixel));
|
||
|
||
RectCornerRadii focusRadii;
|
||
{
|
||
nscoord twipsRadii[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
|
||
ComputePixelRadii(twipsRadii, oneDevPixel, &focusRadii);
|
||
}
|
||
Float focusWidths[4] = { Float(oneCSSPixel / oneDevPixel),
|
||
Float(oneCSSPixel / oneDevPixel),
|
||
Float(oneCSSPixel / oneDevPixel),
|
||
Float(oneCSSPixel / oneDevPixel) };
|
||
|
||
uint8_t focusStyles[4] = { NS_STYLE_BORDER_STYLE_DOTTED,
|
||
NS_STYLE_BORDER_STYLE_DOTTED,
|
||
NS_STYLE_BORDER_STYLE_DOTTED,
|
||
NS_STYLE_BORDER_STYLE_DOTTED };
|
||
nscolor focusColors[4] = { aColor, aColor, aColor, aColor };
|
||
|
||
gfxContext *ctx = aRenderingContext.ThebesContext();
|
||
|
||
// Because this renders a dotted border, the background color
|
||
// should not be used. Therefore, we provide a value that will
|
||
// be blatantly wrong if it ever does get used. (If this becomes
|
||
// something that CSS can style, this function will then have access
|
||
// to a style context and can use the same logic that PaintBorder
|
||
// and PaintOutline do.)
|
||
nsCSSBorderRenderer br(ctx->GetDrawTarget(),
|
||
focusRect,
|
||
focusStyles,
|
||
focusWidths,
|
||
focusRadii,
|
||
focusColors,
|
||
nullptr,
|
||
NS_RGB(255, 0, 0));
|
||
br.DrawBorders();
|
||
|
||
PrintAsStringNewline();
|
||
}
|
||
|
||
// Thebes Border Rendering Code End
|
||
//----------------------------------------------------------------------
|
||
|
||
|
||
//----------------------------------------------------------------------
|
||
|
||
/**
|
||
* Helper for ComputeObjectAnchorPoint; parameters are the same as for
|
||
* that function, except they're for a single coordinate / a single size
|
||
* dimension. (so, x/width vs. y/height)
|
||
*/
|
||
typedef nsStyleBackground::Position::PositionCoord PositionCoord;
|
||
static void
|
||
ComputeObjectAnchorCoord(const PositionCoord& aCoord,
|
||
const nscoord aOriginBounds,
|
||
const nscoord aImageSize,
|
||
nscoord* aTopLeftCoord,
|
||
nscoord* aAnchorPointCoord)
|
||
{
|
||
*aAnchorPointCoord = aCoord.mLength;
|
||
*aTopLeftCoord = aCoord.mLength;
|
||
|
||
if (aCoord.mHasPercent) {
|
||
// Adjust aTopLeftCoord by the specified % of the extra space.
|
||
nscoord extraSpace = aOriginBounds - aImageSize;
|
||
*aTopLeftCoord += NSToCoordRound(aCoord.mPercent * extraSpace);
|
||
|
||
// The anchor-point doesn't care about our image's size; just the size
|
||
// of the region we're rendering into.
|
||
*aAnchorPointCoord += NSToCoordRound(aCoord.mPercent * aOriginBounds);
|
||
}
|
||
}
|
||
|
||
void
|
||
nsImageRenderer::ComputeObjectAnchorPoint(
|
||
const nsStyleBackground::Position& aPos,
|
||
const nsSize& aOriginBounds,
|
||
const nsSize& aImageSize,
|
||
nsPoint* aTopLeft,
|
||
nsPoint* aAnchorPoint)
|
||
{
|
||
ComputeObjectAnchorCoord(aPos.mXPosition,
|
||
aOriginBounds.width, aImageSize.width,
|
||
&aTopLeft->x, &aAnchorPoint->x);
|
||
|
||
ComputeObjectAnchorCoord(aPos.mYPosition,
|
||
aOriginBounds.height, aImageSize.height,
|
||
&aTopLeft->y, &aAnchorPoint->y);
|
||
}
|
||
|
||
nsIFrame*
|
||
nsCSSRendering::FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
|
||
bool aStartAtParent /*= false*/)
|
||
{
|
||
NS_ASSERTION(aFrame, "Cannot find NonTransparentBackgroundFrame in a null frame");
|
||
|
||
nsIFrame* frame = nullptr;
|
||
if (aStartAtParent) {
|
||
frame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
|
||
}
|
||
if (!frame) {
|
||
frame = aFrame;
|
||
}
|
||
|
||
while (frame) {
|
||
// No need to call GetVisitedDependentColor because it always uses
|
||
// this alpha component anyway.
|
||
if (NS_GET_A(frame->StyleBackground()->mBackgroundColor) > 0)
|
||
break;
|
||
|
||
if (frame->IsThemed())
|
||
break;
|
||
|
||
nsIFrame* parent = nsLayoutUtils::GetParentOrPlaceholderFor(frame);
|
||
if (!parent)
|
||
break;
|
||
|
||
frame = parent;
|
||
}
|
||
return frame;
|
||
}
|
||
|
||
// Returns true if aFrame is a canvas frame.
|
||
// We need to treat the viewport as canvas because, even though
|
||
// it does not actually paint a background, we need to get the right
|
||
// background style so we correctly detect transparent documents.
|
||
bool
|
||
nsCSSRendering::IsCanvasFrame(nsIFrame* aFrame)
|
||
{
|
||
nsIAtom* frameType = aFrame->GetType();
|
||
return frameType == nsGkAtoms::canvasFrame ||
|
||
frameType == nsGkAtoms::rootFrame ||
|
||
frameType == nsGkAtoms::pageContentFrame ||
|
||
frameType == nsGkAtoms::viewportFrame;
|
||
}
|
||
|
||
nsIFrame*
|
||
nsCSSRendering::FindBackgroundStyleFrame(nsIFrame* aForFrame)
|
||
{
|
||
const nsStyleBackground* result = aForFrame->StyleBackground();
|
||
|
||
// Check if we need to do propagation from BODY rather than HTML.
|
||
if (!result->IsTransparent()) {
|
||
return aForFrame;
|
||
}
|
||
|
||
nsIContent* content = aForFrame->GetContent();
|
||
// The root element content can't be null. We wouldn't know what
|
||
// frame to create for aFrame.
|
||
// Use |OwnerDoc| so it works during destruction.
|
||
if (!content) {
|
||
return aForFrame;
|
||
}
|
||
|
||
nsIDocument* document = content->OwnerDoc();
|
||
|
||
dom::Element* bodyContent = document->GetBodyElement();
|
||
// We need to null check the body node (bug 118829) since
|
||
// there are cases, thanks to the fix for bug 5569, where we
|
||
// will reflow a document with no body. In particular, if a
|
||
// SCRIPT element in the head blocks the parser and then has a
|
||
// SCRIPT that does "document.location.href = 'foo'", then
|
||
// nsParser::Terminate will call |DidBuildModel| methods
|
||
// through to the content sink, which will call |StartLayout|
|
||
// and thus |Initialize| on the pres shell. See bug 119351
|
||
// for the ugly details.
|
||
if (!bodyContent) {
|
||
return aForFrame;
|
||
}
|
||
|
||
nsIFrame *bodyFrame = bodyContent->GetPrimaryFrame();
|
||
if (!bodyFrame) {
|
||
return aForFrame;
|
||
}
|
||
|
||
return nsLayoutUtils::GetStyleFrame(bodyFrame);
|
||
}
|
||
|
||
/**
|
||
* |FindBackground| finds the correct style data to use to paint the
|
||
* background. It is responsible for handling the following two
|
||
* statements in section 14.2 of CSS2:
|
||
*
|
||
* The background of the box generated by the root element covers the
|
||
* entire canvas.
|
||
*
|
||
* For HTML documents, however, we recommend that authors specify the
|
||
* background for the BODY element rather than the HTML element. User
|
||
* agents should observe the following precedence rules to fill in the
|
||
* background: if the value of the 'background' property for the HTML
|
||
* element is different from 'transparent' then use it, else use the
|
||
* value of the 'background' property for the BODY element. If the
|
||
* resulting value is 'transparent', the rendering is undefined.
|
||
*
|
||
* Thus, in our implementation, it is responsible for ensuring that:
|
||
* + we paint the correct background on the |nsCanvasFrame|,
|
||
* |nsRootBoxFrame|, or |nsPageFrame|,
|
||
* + we don't paint the background on the root element, and
|
||
* + we don't paint the background on the BODY element in *some* cases,
|
||
* and for SGML-based HTML documents only.
|
||
*
|
||
* |FindBackground| returns true if a background should be painted, and
|
||
* the resulting style context to use for the background information
|
||
* will be filled in to |aBackground|.
|
||
*/
|
||
nsStyleContext*
|
||
nsCSSRendering::FindRootFrameBackground(nsIFrame* aForFrame)
|
||
{
|
||
return FindBackgroundStyleFrame(aForFrame)->StyleContext();
|
||
}
|
||
|
||
inline bool
|
||
FindElementBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
|
||
nsStyleContext** aBackgroundSC)
|
||
{
|
||
if (aForFrame == aRootElementFrame) {
|
||
// We must have propagated our background to the viewport or canvas. Abort.
|
||
return false;
|
||
}
|
||
|
||
*aBackgroundSC = aForFrame->StyleContext();
|
||
|
||
// Return true unless the frame is for a BODY element whose background
|
||
// was propagated to the viewport.
|
||
|
||
nsIContent* content = aForFrame->GetContent();
|
||
if (!content || content->Tag() != nsGkAtoms::body)
|
||
return true; // not frame for a "body" element
|
||
// It could be a non-HTML "body" element but that's OK, we'd fail the
|
||
// bodyContent check below
|
||
|
||
if (aForFrame->StyleContext()->GetPseudo())
|
||
return true; // A pseudo-element frame.
|
||
|
||
// We should only look at the <html> background if we're in an HTML document
|
||
nsIDocument* document = content->OwnerDoc();
|
||
|
||
dom::Element* bodyContent = document->GetBodyElement();
|
||
if (bodyContent != content)
|
||
return true; // this wasn't the background that was propagated
|
||
|
||
// This can be called even when there's no root element yet, during frame
|
||
// construction, via nsLayoutUtils::FrameHasTransparency and
|
||
// nsContainerFrame::SyncFrameViewProperties.
|
||
if (!aRootElementFrame)
|
||
return true;
|
||
|
||
const nsStyleBackground* htmlBG = aRootElementFrame->StyleBackground();
|
||
return !htmlBG->IsTransparent();
|
||
}
|
||
|
||
bool
|
||
nsCSSRendering::FindBackground(nsIFrame* aForFrame,
|
||
nsStyleContext** aBackgroundSC)
|
||
{
|
||
nsIFrame* rootElementFrame =
|
||
aForFrame->PresContext()->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
|
||
if (IsCanvasFrame(aForFrame)) {
|
||
*aBackgroundSC = FindCanvasBackground(aForFrame, rootElementFrame);
|
||
return true;
|
||
} else {
|
||
return FindElementBackground(aForFrame, rootElementFrame, aBackgroundSC);
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::BeginFrameTreesLocked()
|
||
{
|
||
++gFrameTreeLockCount;
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::EndFrameTreesLocked()
|
||
{
|
||
NS_ASSERTION(gFrameTreeLockCount > 0, "Unbalanced EndFrameTreeLocked");
|
||
--gFrameTreeLockCount;
|
||
if (gFrameTreeLockCount == 0) {
|
||
gInlineBGData->Reset();
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aFrameArea,
|
||
const nsRect& aDirtyRect,
|
||
float aOpacity)
|
||
{
|
||
DrawTarget& aDrawTarget = *aRenderingContext.GetDrawTarget();
|
||
const nsStyleBorder* styleBorder = aForFrame->StyleBorder();
|
||
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
|
||
if (!shadows)
|
||
return;
|
||
|
||
gfxContextAutoSaveRestore gfxStateRestorer;
|
||
bool hasBorderRadius;
|
||
bool nativeTheme; // mutually exclusive with hasBorderRadius
|
||
const nsStyleDisplay* styleDisplay = aForFrame->StyleDisplay();
|
||
nsITheme::Transparency transparency;
|
||
if (aForFrame->IsThemed(styleDisplay, &transparency)) {
|
||
// We don't respect border-radius for native-themed widgets
|
||
hasBorderRadius = false;
|
||
// For opaque (rectangular) theme widgets we can take the generic
|
||
// border-box path with border-radius disabled.
|
||
nativeTheme = transparency != nsITheme::eOpaque;
|
||
} else {
|
||
nativeTheme = false;
|
||
hasBorderRadius = true; // we'll update this below
|
||
}
|
||
|
||
nsRect frameRect = nativeTheme ?
|
||
aForFrame->GetVisualOverflowRectRelativeToSelf() + aFrameArea.TopLeft() :
|
||
aFrameArea;
|
||
Sides skipSides = aForFrame->GetSkipSides();
|
||
frameRect = ::BoxDecorationRectForBorder(aForFrame, frameRect, skipSides);
|
||
|
||
// Get any border radius, since box-shadow must also have rounded corners if
|
||
// the frame does.
|
||
RectCornerRadii borderRadii;
|
||
const nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
|
||
if (hasBorderRadius) {
|
||
nscoord twipsRadii[8];
|
||
NS_ASSERTION(aFrameArea.Size() == aForFrame->VisualBorderRectRelativeToSelf().Size(),
|
||
"unexpected size");
|
||
nsSize sz = frameRect.Size();
|
||
hasBorderRadius = aForFrame->GetBorderRadii(sz, sz, Sides(), twipsRadii);
|
||
if (hasBorderRadius) {
|
||
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
|
||
}
|
||
}
|
||
|
||
Rect frameGfxRect = NSRectToRect(frameRect, twipsPerPixel);
|
||
frameGfxRect.Round();
|
||
|
||
// We don't show anything that intersects with the frame we're blurring on. So tell the
|
||
// blurrer not to do unnecessary work there.
|
||
gfxRect skipGfxRect = ThebesRect(frameGfxRect);
|
||
bool useSkipGfxRect = true;
|
||
if (nativeTheme) {
|
||
// Optimize non-leaf native-themed frames by skipping computing pixels
|
||
// in the padding-box. We assume the padding-box is going to be painted
|
||
// opaquely for non-leaf frames.
|
||
// XXX this may not be a safe assumption; we should make this go away
|
||
// by optimizing box-shadow drawing more for the cases where we don't have a skip-rect.
|
||
useSkipGfxRect = !aForFrame->IsLeaf();
|
||
nsRect paddingRect =
|
||
aForFrame->GetPaddingRect() - aForFrame->GetPosition() + aFrameArea.TopLeft();
|
||
skipGfxRect = nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
|
||
} else if (hasBorderRadius) {
|
||
skipGfxRect.Deflate(gfxMargin(
|
||
std::max(borderRadii[C_TL].height, borderRadii[C_TR].height), 0,
|
||
std::max(borderRadii[C_BL].height, borderRadii[C_BR].height), 0));
|
||
}
|
||
|
||
gfxContext* renderContext = aRenderingContext.ThebesContext();
|
||
|
||
for (uint32_t i = shadows->Length(); i > 0; --i) {
|
||
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
|
||
if (shadowItem->mInset)
|
||
continue;
|
||
|
||
nsRect shadowRect = frameRect;
|
||
shadowRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
|
||
if (!nativeTheme) {
|
||
shadowRect.Inflate(shadowItem->mSpread, shadowItem->mSpread);
|
||
}
|
||
|
||
// shadowRect won't include the blur, so make an extra rect here that includes the blur
|
||
// for use in the even-odd rule below.
|
||
nsRect shadowRectPlusBlur = shadowRect;
|
||
nscoord blurRadius = shadowItem->mRadius;
|
||
shadowRectPlusBlur.Inflate(
|
||
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel));
|
||
|
||
Rect shadowGfxRectPlusBlur =
|
||
NSRectToRect(shadowRectPlusBlur, twipsPerPixel);
|
||
shadowGfxRectPlusBlur.RoundOut();
|
||
MaybeSnapToDevicePixels(shadowGfxRectPlusBlur, aDrawTarget, true);
|
||
|
||
// Set the shadow color; if not specified, use the foreground color
|
||
nscolor shadowColor;
|
||
if (shadowItem->mHasColor)
|
||
shadowColor = shadowItem->mColor;
|
||
else
|
||
shadowColor = aForFrame->StyleColor()->mColor;
|
||
|
||
gfxRGBA gfxShadowColor(shadowColor);
|
||
gfxShadowColor.a *= aOpacity;
|
||
|
||
if (nativeTheme) {
|
||
nsContextBoxBlur blurringArea;
|
||
|
||
// When getting the widget shape from the native theme, we're going
|
||
// to draw the widget into the shadow surface to create a mask.
|
||
// We need to ensure that there actually *is* a shadow surface
|
||
// and that we're not going to draw directly into renderContext.
|
||
gfxContext* shadowContext =
|
||
blurringArea.Init(shadowRect, shadowItem->mSpread,
|
||
blurRadius, twipsPerPixel, renderContext, aDirtyRect,
|
||
useSkipGfxRect ? &skipGfxRect : nullptr,
|
||
nsContextBoxBlur::FORCE_MASK);
|
||
if (!shadowContext)
|
||
continue;
|
||
|
||
MOZ_ASSERT(shadowContext == blurringArea.GetContext());
|
||
|
||
renderContext->Save();
|
||
renderContext->SetColor(gfxShadowColor);
|
||
|
||
// Draw the shape of the frame so it can be blurred. Recall how nsContextBoxBlur
|
||
// doesn't make any temporary surfaces if blur is 0 and it just returns the original
|
||
// surface? If we have no blur, we're painting this fill on the actual content surface
|
||
// (renderContext == shadowContext) which is why we set up the color and clip
|
||
// before doing this.
|
||
|
||
// We don't clip the border-box from the shadow, nor any other box.
|
||
// We assume that the native theme is going to paint over the shadow.
|
||
|
||
// Draw the widget shape
|
||
gfxContextMatrixAutoSaveRestore save(shadowContext);
|
||
gfxPoint devPixelOffset =
|
||
nsLayoutUtils::PointToGfxPoint(nsPoint(shadowItem->mXOffset,
|
||
shadowItem->mYOffset),
|
||
aPresContext->AppUnitsPerDevPixel());
|
||
shadowContext->SetMatrix(
|
||
shadowContext->CurrentMatrix().Translate(devPixelOffset));
|
||
|
||
nsRect nativeRect;
|
||
nativeRect.IntersectRect(frameRect, aDirtyRect);
|
||
nsRenderingContext wrapperCtx(shadowContext);
|
||
aPresContext->GetTheme()->DrawWidgetBackground(&wrapperCtx, aForFrame,
|
||
styleDisplay->mAppearance, aFrameArea, nativeRect);
|
||
|
||
blurringArea.DoPaint();
|
||
renderContext->Restore();
|
||
} else {
|
||
renderContext->Save();
|
||
|
||
{
|
||
// Clip out the interior of the frame's border edge so that the shadow
|
||
// is only painted outside that area.
|
||
RefPtr<PathBuilder> builder =
|
||
aDrawTarget.CreatePathBuilder(FillRule::FILL_EVEN_ODD);
|
||
AppendRectToPath(builder, shadowGfxRectPlusBlur);
|
||
if (hasBorderRadius) {
|
||
AppendRoundedRectToPath(builder, frameGfxRect, borderRadii);
|
||
} else {
|
||
AppendRectToPath(builder, frameGfxRect);
|
||
}
|
||
RefPtr<Path> path = builder->Finish();
|
||
renderContext->Clip(path);
|
||
}
|
||
|
||
// Clip the shadow so that we only get the part that applies to aForFrame.
|
||
nsRect fragmentClip = shadowRectPlusBlur;
|
||
if (!skipSides.IsEmpty()) {
|
||
if (skipSides.Left()) {
|
||
nscoord xmost = fragmentClip.XMost();
|
||
fragmentClip.x = aFrameArea.x;
|
||
fragmentClip.width = xmost - fragmentClip.x;
|
||
}
|
||
if (skipSides.Right()) {
|
||
nscoord xmost = fragmentClip.XMost();
|
||
nscoord overflow = xmost - aFrameArea.XMost();
|
||
if (overflow > 0) {
|
||
fragmentClip.width -= overflow;
|
||
}
|
||
}
|
||
if (skipSides.Top()) {
|
||
nscoord ymost = fragmentClip.YMost();
|
||
fragmentClip.y = aFrameArea.y;
|
||
fragmentClip.height = ymost - fragmentClip.y;
|
||
}
|
||
if (skipSides.Bottom()) {
|
||
nscoord ymost = fragmentClip.YMost();
|
||
nscoord overflow = ymost - aFrameArea.YMost();
|
||
if (overflow > 0) {
|
||
fragmentClip.height -= overflow;
|
||
}
|
||
}
|
||
}
|
||
renderContext->
|
||
Clip(NSRectToSnappedRect(fragmentClip,
|
||
aForFrame->PresContext()->AppUnitsPerDevPixel(),
|
||
aDrawTarget));
|
||
|
||
RectCornerRadii clipRectRadii;
|
||
if (hasBorderRadius) {
|
||
Float spreadDistance = shadowItem->mSpread / twipsPerPixel;
|
||
|
||
Float borderSizes[4];
|
||
|
||
borderSizes[NS_SIDE_LEFT] = spreadDistance;
|
||
borderSizes[NS_SIDE_TOP] = spreadDistance;
|
||
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
|
||
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
|
||
|
||
nsCSSBorderRenderer::ComputeOuterRadii(borderRadii, borderSizes,
|
||
&clipRectRadii);
|
||
|
||
}
|
||
nsContextBoxBlur::BlurRectangle(renderContext,
|
||
shadowRect,
|
||
twipsPerPixel,
|
||
hasBorderRadius ? &clipRectRadii : nullptr,
|
||
blurRadius,
|
||
gfxShadowColor,
|
||
aDirtyRect,
|
||
skipGfxRect);
|
||
renderContext->Restore();
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aFrameArea,
|
||
const nsRect& aDirtyRect)
|
||
{
|
||
const nsStyleBorder* styleBorder = aForFrame->StyleBorder();
|
||
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
|
||
if (!shadows)
|
||
return;
|
||
if (aForFrame->IsThemed() && aForFrame->GetContent() &&
|
||
!nsContentUtils::IsChromeDoc(aForFrame->GetContent()->GetCurrentDoc())) {
|
||
// There's no way of getting hold of a shape corresponding to a
|
||
// "padding-box" for native-themed widgets, so just don't draw
|
||
// inner box-shadows for them. But we allow chrome to paint inner
|
||
// box shadows since chrome can be aware of the platform theme.
|
||
return;
|
||
}
|
||
|
||
NS_ASSERTION(aForFrame->GetType() == nsGkAtoms::fieldSetFrame ||
|
||
aFrameArea.Size() == aForFrame->GetSize(), "unexpected size");
|
||
|
||
Sides skipSides = aForFrame->GetSkipSides();
|
||
nsRect frameRect =
|
||
::BoxDecorationRectForBorder(aForFrame, aFrameArea, skipSides);
|
||
nsRect paddingRect = frameRect;
|
||
nsMargin border = aForFrame->GetUsedBorder();
|
||
paddingRect.Deflate(border);
|
||
|
||
// Get any border radius, since box-shadow must also have rounded corners
|
||
// if the frame does.
|
||
nscoord twipsRadii[8];
|
||
nsSize sz = frameRect.Size();
|
||
bool hasBorderRadius = aForFrame->GetBorderRadii(sz, sz, Sides(), twipsRadii);
|
||
const nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
|
||
|
||
RectCornerRadii innerRadii;
|
||
if (hasBorderRadius) {
|
||
RectCornerRadii borderRadii;
|
||
|
||
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
|
||
Float borderSizes[4] = {
|
||
Float(border.top / twipsPerPixel),
|
||
Float(border.right / twipsPerPixel),
|
||
Float(border.bottom / twipsPerPixel),
|
||
Float(border.left / twipsPerPixel)
|
||
};
|
||
nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
|
||
&innerRadii);
|
||
}
|
||
|
||
for (uint32_t i = shadows->Length(); i > 0; --i) {
|
||
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
|
||
if (!shadowItem->mInset)
|
||
continue;
|
||
|
||
// shadowPaintRect: the area to paint on the temp surface
|
||
// shadowClipRect: the area on the temporary surface within shadowPaintRect
|
||
// that we will NOT paint in
|
||
nscoord blurRadius = shadowItem->mRadius;
|
||
nsMargin blurMargin =
|
||
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel);
|
||
nsRect shadowPaintRect = paddingRect;
|
||
shadowPaintRect.Inflate(blurMargin);
|
||
|
||
nsRect shadowClipRect = paddingRect;
|
||
shadowClipRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
|
||
shadowClipRect.Deflate(shadowItem->mSpread, shadowItem->mSpread);
|
||
|
||
RectCornerRadii clipRectRadii;
|
||
if (hasBorderRadius) {
|
||
// Calculate the radii the inner clipping rect will have
|
||
Float spreadDistance = shadowItem->mSpread / twipsPerPixel;
|
||
Float borderSizes[4] = {0, 0, 0, 0};
|
||
|
||
// See PaintBoxShadowOuter and bug 514670
|
||
if (innerRadii[C_TL].width > 0 || innerRadii[C_BL].width > 0) {
|
||
borderSizes[NS_SIDE_LEFT] = spreadDistance;
|
||
}
|
||
|
||
if (innerRadii[C_TL].height > 0 || innerRadii[C_TR].height > 0) {
|
||
borderSizes[NS_SIDE_TOP] = spreadDistance;
|
||
}
|
||
|
||
if (innerRadii[C_TR].width > 0 || innerRadii[C_BR].width > 0) {
|
||
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
|
||
}
|
||
|
||
if (innerRadii[C_BL].height > 0 || innerRadii[C_BR].height > 0) {
|
||
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
|
||
}
|
||
|
||
nsCSSBorderRenderer::ComputeInnerRadii(innerRadii, borderSizes,
|
||
&clipRectRadii);
|
||
}
|
||
|
||
// Set the "skip rect" to the area within the frame that we don't paint in,
|
||
// including after blurring.
|
||
nsRect skipRect = shadowClipRect;
|
||
skipRect.Deflate(blurMargin);
|
||
gfxRect skipGfxRect = nsLayoutUtils::RectToGfxRect(skipRect, twipsPerPixel);
|
||
if (hasBorderRadius) {
|
||
skipGfxRect.Deflate(gfxMargin(
|
||
std::max(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height), 0,
|
||
std::max(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height), 0));
|
||
}
|
||
|
||
// When there's a blur radius, gfxAlphaBoxBlur leaves the skiprect area
|
||
// unchanged. And by construction the gfxSkipRect is not touched by the
|
||
// rendered shadow (even after blurring), so those pixels must be completely
|
||
// transparent in the shadow, so drawing them changes nothing.
|
||
gfxContext* renderContext = aRenderingContext.ThebesContext();
|
||
DrawTarget* drawTarget = renderContext->GetDrawTarget();
|
||
nsContextBoxBlur blurringArea;
|
||
gfxContext* shadowContext =
|
||
blurringArea.Init(shadowPaintRect, 0, blurRadius, twipsPerPixel,
|
||
renderContext, aDirtyRect, &skipGfxRect);
|
||
if (!shadowContext)
|
||
continue;
|
||
DrawTarget* shadowDT = shadowContext->GetDrawTarget();
|
||
|
||
// shadowContext is owned by either blurringArea or aRenderingContext.
|
||
MOZ_ASSERT(shadowContext == renderContext ||
|
||
shadowContext == blurringArea.GetContext());
|
||
|
||
// Set the shadow color; if not specified, use the foreground color
|
||
Color shadowColor = Color::FromABGR(shadowItem->mHasColor ?
|
||
shadowItem->mColor :
|
||
aForFrame->StyleColor()->mColor);
|
||
renderContext->Save();
|
||
renderContext->SetColor(ThebesColor(shadowColor));
|
||
|
||
// Clip the context to the area of the frame's padding rect, so no part of the
|
||
// shadow is painted outside. Also cut out anything beyond where the inset shadow
|
||
// will be.
|
||
Rect shadowGfxRect = NSRectToRect(paddingRect, twipsPerPixel);
|
||
shadowGfxRect.Round();
|
||
if (hasBorderRadius) {
|
||
RefPtr<Path> roundedRect =
|
||
MakePathForRoundedRect(*drawTarget, shadowGfxRect, innerRadii);
|
||
renderContext->Clip(roundedRect);
|
||
} else {
|
||
renderContext->Clip(shadowGfxRect);
|
||
}
|
||
|
||
// Fill the surface minus the area within the frame that we should
|
||
// not paint in, and blur and apply it.
|
||
Rect shadowPaintGfxRect = NSRectToRect(shadowPaintRect, twipsPerPixel);
|
||
shadowPaintGfxRect.RoundOut();
|
||
Rect shadowClipGfxRect = NSRectToRect(shadowClipRect, twipsPerPixel);
|
||
shadowClipGfxRect.Round();
|
||
RefPtr<PathBuilder> builder =
|
||
shadowDT->CreatePathBuilder(FillRule::FILL_EVEN_ODD);
|
||
AppendRectToPath(builder, shadowPaintGfxRect, true);
|
||
if (hasBorderRadius) {
|
||
AppendRoundedRectToPath(builder, shadowClipGfxRect, clipRectRadii, false);
|
||
} else {
|
||
AppendRectToPath(builder, shadowClipGfxRect, false);
|
||
}
|
||
RefPtr<Path> path = builder->Finish();
|
||
shadowContext->SetPath(path);
|
||
shadowContext->Fill();
|
||
shadowContext->NewPath();
|
||
|
||
blurringArea.DoPaint();
|
||
renderContext->Restore();
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBackground(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aBorderArea,
|
||
uint32_t aFlags,
|
||
nsRect* aBGClipRect,
|
||
int32_t aLayer)
|
||
{
|
||
PROFILER_LABEL("nsCSSRendering", "PaintBackground",
|
||
js::ProfileEntry::Category::GRAPHICS);
|
||
|
||
NS_PRECONDITION(aForFrame,
|
||
"Frame is expected to be provided to PaintBackground");
|
||
|
||
nsStyleContext *sc;
|
||
if (!FindBackground(aForFrame, &sc)) {
|
||
// We don't want to bail out if moz-appearance is set on a root
|
||
// node. If it has a parent content node, bail because it's not
|
||
// a root, otherwise keep going in order to let the theme stuff
|
||
// draw the background. The canvas really should be drawing the
|
||
// bg, but there's no way to hook that up via css.
|
||
if (!aForFrame->StyleDisplay()->mAppearance) {
|
||
return;
|
||
}
|
||
|
||
nsIContent* content = aForFrame->GetContent();
|
||
if (!content || content->GetParent()) {
|
||
return;
|
||
}
|
||
|
||
sc = aForFrame->StyleContext();
|
||
}
|
||
|
||
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
|
||
aDirtyRect, aBorderArea, sc,
|
||
*aForFrame->StyleBorder(), aFlags,
|
||
aBGClipRect, aLayer);
|
||
}
|
||
|
||
static bool
|
||
IsOpaqueBorderEdge(const nsStyleBorder& aBorder, mozilla::css::Side aSide)
|
||
{
|
||
if (aBorder.GetComputedBorder().Side(aSide) == 0)
|
||
return true;
|
||
switch (aBorder.GetBorderStyle(aSide)) {
|
||
case NS_STYLE_BORDER_STYLE_SOLID:
|
||
case NS_STYLE_BORDER_STYLE_GROOVE:
|
||
case NS_STYLE_BORDER_STYLE_RIDGE:
|
||
case NS_STYLE_BORDER_STYLE_INSET:
|
||
case NS_STYLE_BORDER_STYLE_OUTSET:
|
||
break;
|
||
default:
|
||
return false;
|
||
}
|
||
|
||
// If we're using a border image, assume it's not fully opaque,
|
||
// because we may not even have the image loaded at this point, and
|
||
// even if we did, checking whether the relevant tile is fully
|
||
// opaque would be too much work.
|
||
if (aBorder.mBorderImageSource.GetType() != eStyleImageType_Null)
|
||
return false;
|
||
|
||
nscolor color;
|
||
bool isForeground;
|
||
aBorder.GetBorderColor(aSide, color, isForeground);
|
||
|
||
// We don't know the foreground color here, so if it's being used
|
||
// we must assume it might be transparent.
|
||
if (isForeground)
|
||
return false;
|
||
|
||
return NS_GET_A(color) == 255;
|
||
}
|
||
|
||
/**
|
||
* Returns true if all border edges are either missing or opaque.
|
||
*/
|
||
static bool
|
||
IsOpaqueBorder(const nsStyleBorder& aBorder)
|
||
{
|
||
if (aBorder.mBorderColors)
|
||
return false;
|
||
NS_FOR_CSS_SIDES(i) {
|
||
if (!IsOpaqueBorderEdge(aBorder, i))
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
static inline void
|
||
SetupDirtyRects(const nsRect& aBGClipArea, const nsRect& aCallerDirtyRect,
|
||
nscoord aAppUnitsPerPixel,
|
||
/* OUT: */
|
||
nsRect* aDirtyRect, gfxRect* aDirtyRectGfx)
|
||
{
|
||
aDirtyRect->IntersectRect(aBGClipArea, aCallerDirtyRect);
|
||
|
||
// Compute the Thebes equivalent of the dirtyRect.
|
||
*aDirtyRectGfx = nsLayoutUtils::RectToGfxRect(*aDirtyRect, aAppUnitsPerPixel);
|
||
NS_WARN_IF_FALSE(aDirtyRect->IsEmpty() || !aDirtyRectGfx->IsEmpty(),
|
||
"converted dirty rect should not be empty");
|
||
NS_ABORT_IF_FALSE(!aDirtyRect->IsEmpty() || aDirtyRectGfx->IsEmpty(),
|
||
"second should be empty if first is");
|
||
}
|
||
|
||
/* static */ void
|
||
nsCSSRendering::GetBackgroundClip(const nsStyleBackground::Layer& aLayer,
|
||
nsIFrame* aForFrame, const nsStyleBorder& aBorder,
|
||
const nsRect& aBorderArea, const nsRect& aCallerDirtyRect,
|
||
bool aWillPaintBorder, nscoord aAppUnitsPerPixel,
|
||
/* out */ BackgroundClipState* aClipState)
|
||
{
|
||
// Compute the outermost boundary of the area that might be painted.
|
||
// Same coordinate space as aBorderArea.
|
||
Sides skipSides = aForFrame->GetSkipSides();
|
||
nsRect clipBorderArea =
|
||
::BoxDecorationRectForBorder(aForFrame, aBorderArea, skipSides, &aBorder);
|
||
|
||
bool haveRoundedCorners = GetRadii(aForFrame, aBorder, aBorderArea,
|
||
clipBorderArea, aClipState->mRadii);
|
||
|
||
uint8_t backgroundClip = aLayer.mClip;
|
||
|
||
bool isSolidBorder =
|
||
aWillPaintBorder && IsOpaqueBorder(aBorder);
|
||
if (isSolidBorder && backgroundClip == NS_STYLE_BG_CLIP_BORDER) {
|
||
// If we have rounded corners, we need to inflate the background
|
||
// drawing area a bit to avoid seams between the border and
|
||
// background.
|
||
backgroundClip = haveRoundedCorners ?
|
||
NS_STYLE_BG_CLIP_MOZ_ALMOST_PADDING : NS_STYLE_BG_CLIP_PADDING;
|
||
}
|
||
|
||
aClipState->mBGClipArea = clipBorderArea;
|
||
aClipState->mHasAdditionalBGClipArea = false;
|
||
aClipState->mCustomClip = false;
|
||
|
||
if (aForFrame->GetType() == nsGkAtoms::scrollFrame &&
|
||
NS_STYLE_BG_ATTACHMENT_LOCAL == aLayer.mAttachment) {
|
||
// As of this writing, this is still in discussion in the CSS Working Group
|
||
// http://lists.w3.org/Archives/Public/www-style/2013Jul/0250.html
|
||
|
||
// The rectangle for 'background-clip' scrolls with the content,
|
||
// but the background is also clipped at a non-scrolling 'padding-box'
|
||
// like the content. (See below.)
|
||
// Therefore, only 'content-box' makes a difference here.
|
||
if (backgroundClip == NS_STYLE_BG_CLIP_CONTENT) {
|
||
nsIScrollableFrame* scrollableFrame = do_QueryFrame(aForFrame);
|
||
// Clip at a rectangle attached to the scrolled content.
|
||
aClipState->mHasAdditionalBGClipArea = true;
|
||
aClipState->mAdditionalBGClipArea = nsRect(
|
||
aClipState->mBGClipArea.TopLeft()
|
||
+ scrollableFrame->GetScrolledFrame()->GetPosition()
|
||
// For the dir=rtl case:
|
||
+ scrollableFrame->GetScrollRange().TopLeft(),
|
||
scrollableFrame->GetScrolledRect().Size());
|
||
nsMargin padding = aForFrame->GetUsedPadding();
|
||
// padding-bottom is ignored on scrollable frames:
|
||
// https://bugzilla.mozilla.org/show_bug.cgi?id=748518
|
||
padding.bottom = 0;
|
||
padding.ApplySkipSides(skipSides);
|
||
aClipState->mAdditionalBGClipArea.Deflate(padding);
|
||
}
|
||
|
||
// Also clip at a non-scrolling, rounded-corner 'padding-box',
|
||
// same as the scrolled content because of the 'overflow' property.
|
||
backgroundClip = NS_STYLE_BG_CLIP_PADDING;
|
||
}
|
||
|
||
if (backgroundClip != NS_STYLE_BG_CLIP_BORDER) {
|
||
nsMargin border = aForFrame->GetUsedBorder();
|
||
if (backgroundClip == NS_STYLE_BG_CLIP_MOZ_ALMOST_PADDING) {
|
||
// Reduce |border| by 1px (device pixels) on all sides, if
|
||
// possible, so that we don't get antialiasing seams between the
|
||
// background and border.
|
||
border.top = std::max(0, border.top - aAppUnitsPerPixel);
|
||
border.right = std::max(0, border.right - aAppUnitsPerPixel);
|
||
border.bottom = std::max(0, border.bottom - aAppUnitsPerPixel);
|
||
border.left = std::max(0, border.left - aAppUnitsPerPixel);
|
||
} else if (backgroundClip != NS_STYLE_BG_CLIP_PADDING) {
|
||
NS_ASSERTION(backgroundClip == NS_STYLE_BG_CLIP_CONTENT,
|
||
"unexpected background-clip");
|
||
border += aForFrame->GetUsedPadding();
|
||
}
|
||
border.ApplySkipSides(skipSides);
|
||
aClipState->mBGClipArea.Deflate(border);
|
||
|
||
if (haveRoundedCorners) {
|
||
nsIFrame::InsetBorderRadii(aClipState->mRadii, border);
|
||
}
|
||
}
|
||
|
||
if (haveRoundedCorners) {
|
||
auto d2a = aForFrame->PresContext()->AppUnitsPerDevPixel();
|
||
nsCSSRendering::ComputePixelRadii(aClipState->mRadii, d2a, &aClipState->mClippedRadii);
|
||
aClipState->mHasRoundedCorners = true;
|
||
} else {
|
||
aClipState->mHasRoundedCorners = false;
|
||
}
|
||
|
||
|
||
if (!haveRoundedCorners && aClipState->mHasAdditionalBGClipArea) {
|
||
// Do the intersection here to account for the fast path(?) below.
|
||
aClipState->mBGClipArea =
|
||
aClipState->mBGClipArea.Intersect(aClipState->mAdditionalBGClipArea);
|
||
aClipState->mHasAdditionalBGClipArea = false;
|
||
}
|
||
|
||
SetupDirtyRects(aClipState->mBGClipArea, aCallerDirtyRect, aAppUnitsPerPixel,
|
||
&aClipState->mDirtyRect, &aClipState->mDirtyRectGfx);
|
||
}
|
||
|
||
static void
|
||
SetupBackgroundClip(nsCSSRendering::BackgroundClipState& aClipState,
|
||
gfxContext *aCtx, nscoord aAppUnitsPerPixel,
|
||
gfxContextAutoSaveRestore* aAutoSR)
|
||
{
|
||
if (aClipState.mDirtyRectGfx.IsEmpty()) {
|
||
// Our caller won't draw anything under this condition, so no need
|
||
// to set more up.
|
||
return;
|
||
}
|
||
|
||
if (aClipState.mCustomClip) {
|
||
// We don't support custom clips and rounded corners, arguably a bug, but
|
||
// table painting seems to depend on it.
|
||
return;
|
||
}
|
||
|
||
DrawTarget* drawTarget = aCtx->GetDrawTarget();
|
||
|
||
// If we have rounded corners, clip all subsequent drawing to the
|
||
// rounded rectangle defined by bgArea and bgRadii (we don't know
|
||
// whether the rounded corners intrude on the dirtyRect or not).
|
||
// Do not do this if we have a caller-provided clip rect --
|
||
// as above with bgArea, arguably a bug, but table painting seems
|
||
// to depend on it.
|
||
|
||
if (aClipState.mHasAdditionalBGClipArea) {
|
||
gfxRect bgAreaGfx = nsLayoutUtils::RectToGfxRect(
|
||
aClipState.mAdditionalBGClipArea, aAppUnitsPerPixel);
|
||
bgAreaGfx.Round();
|
||
bgAreaGfx.Condition();
|
||
|
||
aAutoSR->EnsureSaved(aCtx);
|
||
aCtx->NewPath();
|
||
aCtx->Rectangle(bgAreaGfx, true);
|
||
aCtx->Clip();
|
||
}
|
||
|
||
if (aClipState.mHasRoundedCorners) {
|
||
Rect bgAreaGfx = NSRectToRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
|
||
bgAreaGfx.Round();
|
||
|
||
if (bgAreaGfx.IsEmpty()) {
|
||
// I think it's become possible to hit this since
|
||
// http://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
|
||
NS_WARNING("converted background area should not be empty");
|
||
// Make our caller not do anything.
|
||
aClipState.mDirtyRectGfx.SizeTo(gfxSize(0.0, 0.0));
|
||
return;
|
||
}
|
||
|
||
aAutoSR->EnsureSaved(aCtx);
|
||
|
||
RefPtr<Path> roundedRect =
|
||
MakePathForRoundedRect(*drawTarget, bgAreaGfx, aClipState.mClippedRadii);
|
||
aCtx->Clip(roundedRect);
|
||
}
|
||
}
|
||
|
||
static void
|
||
DrawBackgroundColor(nsCSSRendering::BackgroundClipState& aClipState,
|
||
gfxContext *aCtx, nscoord aAppUnitsPerPixel)
|
||
{
|
||
if (aClipState.mDirtyRectGfx.IsEmpty()) {
|
||
// Our caller won't draw anything under this condition, so no need
|
||
// to set more up.
|
||
return;
|
||
}
|
||
|
||
DrawTarget* drawTarget = aCtx->GetDrawTarget();
|
||
|
||
// We don't support custom clips and rounded corners, arguably a bug, but
|
||
// table painting seems to depend on it.
|
||
if (!aClipState.mHasRoundedCorners || aClipState.mCustomClip) {
|
||
aCtx->NewPath();
|
||
aCtx->Rectangle(aClipState.mDirtyRectGfx, true);
|
||
aCtx->Fill();
|
||
return;
|
||
}
|
||
|
||
Rect bgAreaGfx = NSRectToRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
|
||
bgAreaGfx.Round();
|
||
|
||
if (bgAreaGfx.IsEmpty()) {
|
||
// I think it's become possible to hit this since
|
||
// http://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
|
||
NS_WARNING("converted background area should not be empty");
|
||
// Make our caller not do anything.
|
||
aClipState.mDirtyRectGfx.SizeTo(gfxSize(0.0, 0.0));
|
||
return;
|
||
}
|
||
|
||
aCtx->Save();
|
||
gfxRect dirty = ThebesRect(bgAreaGfx).Intersect(aClipState.mDirtyRectGfx);
|
||
|
||
aCtx->NewPath();
|
||
aCtx->Rectangle(dirty, true);
|
||
aCtx->Clip();
|
||
|
||
if (aClipState.mHasAdditionalBGClipArea) {
|
||
gfxRect bgAdditionalAreaGfx = nsLayoutUtils::RectToGfxRect(
|
||
aClipState.mAdditionalBGClipArea, aAppUnitsPerPixel);
|
||
bgAdditionalAreaGfx.Round();
|
||
bgAdditionalAreaGfx.Condition();
|
||
aCtx->NewPath();
|
||
aCtx->Rectangle(bgAdditionalAreaGfx, true);
|
||
aCtx->Clip();
|
||
}
|
||
|
||
RefPtr<Path> roundedRect =
|
||
MakePathForRoundedRect(*drawTarget, bgAreaGfx, aClipState.mClippedRadii);
|
||
aCtx->SetPath(roundedRect);
|
||
aCtx->Fill();
|
||
aCtx->Restore();
|
||
}
|
||
|
||
nscolor
|
||
nsCSSRendering::DetermineBackgroundColor(nsPresContext* aPresContext,
|
||
nsStyleContext* aStyleContext,
|
||
nsIFrame* aFrame,
|
||
bool& aDrawBackgroundImage,
|
||
bool& aDrawBackgroundColor)
|
||
{
|
||
aDrawBackgroundImage = true;
|
||
aDrawBackgroundColor = true;
|
||
|
||
if (aFrame->HonorPrintBackgroundSettings()) {
|
||
aDrawBackgroundImage = aPresContext->GetBackgroundImageDraw();
|
||
aDrawBackgroundColor = aPresContext->GetBackgroundColorDraw();
|
||
}
|
||
|
||
const nsStyleBackground *bg = aStyleContext->StyleBackground();
|
||
nscolor bgColor;
|
||
if (aDrawBackgroundColor) {
|
||
bgColor =
|
||
aStyleContext->GetVisitedDependentColor(eCSSProperty_background_color);
|
||
if (NS_GET_A(bgColor) == 0) {
|
||
aDrawBackgroundColor = false;
|
||
}
|
||
} else {
|
||
// If GetBackgroundColorDraw() is false, we are still expected to
|
||
// draw color in the background of any frame that's not completely
|
||
// transparent, but we are expected to use white instead of whatever
|
||
// color was specified.
|
||
bgColor = NS_RGB(255, 255, 255);
|
||
if (aDrawBackgroundImage || !bg->IsTransparent()) {
|
||
aDrawBackgroundColor = true;
|
||
} else {
|
||
bgColor = NS_RGBA(0,0,0,0);
|
||
}
|
||
}
|
||
|
||
// We can skip painting the background color if a background image is opaque.
|
||
if (aDrawBackgroundColor &&
|
||
bg->BottomLayer().mRepeat.mXRepeat == NS_STYLE_BG_REPEAT_REPEAT &&
|
||
bg->BottomLayer().mRepeat.mYRepeat == NS_STYLE_BG_REPEAT_REPEAT &&
|
||
bg->BottomLayer().mImage.IsOpaque() &&
|
||
bg->BottomLayer().mBlendMode == NS_STYLE_BLEND_NORMAL) {
|
||
aDrawBackgroundColor = false;
|
||
}
|
||
|
||
return bgColor;
|
||
}
|
||
|
||
static gfxFloat
|
||
ConvertGradientValueToPixels(const nsStyleCoord& aCoord,
|
||
gfxFloat aFillLength,
|
||
int32_t aAppUnitsPerPixel)
|
||
{
|
||
switch (aCoord.GetUnit()) {
|
||
case eStyleUnit_Percent:
|
||
return aCoord.GetPercentValue() * aFillLength;
|
||
case eStyleUnit_Coord:
|
||
return NSAppUnitsToFloatPixels(aCoord.GetCoordValue(), aAppUnitsPerPixel);
|
||
case eStyleUnit_Calc: {
|
||
const nsStyleCoord::Calc *calc = aCoord.GetCalcValue();
|
||
return calc->mPercent * aFillLength +
|
||
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
|
||
}
|
||
default:
|
||
NS_WARNING("Unexpected coord unit");
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
// Given a box with size aBoxSize and origin (0,0), and an angle aAngle,
|
||
// and a starting point for the gradient line aStart, find the endpoint of
|
||
// the gradient line --- the intersection of the gradient line with a line
|
||
// perpendicular to aAngle that passes through the farthest corner in the
|
||
// direction aAngle.
|
||
static gfxPoint
|
||
ComputeGradientLineEndFromAngle(const gfxPoint& aStart,
|
||
double aAngle,
|
||
const gfxSize& aBoxSize)
|
||
{
|
||
double dx = cos(-aAngle);
|
||
double dy = sin(-aAngle);
|
||
gfxPoint farthestCorner(dx > 0 ? aBoxSize.width : 0,
|
||
dy > 0 ? aBoxSize.height : 0);
|
||
gfxPoint delta = farthestCorner - aStart;
|
||
double u = delta.x*dy - delta.y*dx;
|
||
return farthestCorner + gfxPoint(-u*dy, u*dx);
|
||
}
|
||
|
||
// Compute the start and end points of the gradient line for a linear gradient.
|
||
static void
|
||
ComputeLinearGradientLine(nsPresContext* aPresContext,
|
||
nsStyleGradient* aGradient,
|
||
const gfxSize& aBoxSize,
|
||
gfxPoint* aLineStart,
|
||
gfxPoint* aLineEnd)
|
||
{
|
||
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
|
||
double angle;
|
||
if (aGradient->mAngle.IsAngleValue()) {
|
||
angle = aGradient->mAngle.GetAngleValueInRadians();
|
||
if (!aGradient->mLegacySyntax) {
|
||
angle = M_PI_2 - angle;
|
||
}
|
||
} else {
|
||
angle = -M_PI_2; // defaults to vertical gradient starting from top
|
||
}
|
||
gfxPoint center(aBoxSize.width/2, aBoxSize.height/2);
|
||
*aLineEnd = ComputeGradientLineEndFromAngle(center, angle, aBoxSize);
|
||
*aLineStart = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineEnd;
|
||
} else if (!aGradient->mLegacySyntax) {
|
||
float xSign = aGradient->mBgPosX.GetPercentValue() * 2 - 1;
|
||
float ySign = 1 - aGradient->mBgPosY.GetPercentValue() * 2;
|
||
double angle = atan2(ySign * aBoxSize.width, xSign * aBoxSize.height);
|
||
gfxPoint center(aBoxSize.width/2, aBoxSize.height/2);
|
||
*aLineEnd = ComputeGradientLineEndFromAngle(center, angle, aBoxSize);
|
||
*aLineStart = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineEnd;
|
||
} else {
|
||
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
|
||
*aLineStart = gfxPoint(
|
||
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
|
||
appUnitsPerPixel),
|
||
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
|
||
appUnitsPerPixel));
|
||
if (aGradient->mAngle.IsAngleValue()) {
|
||
MOZ_ASSERT(aGradient->mLegacySyntax);
|
||
double angle = aGradient->mAngle.GetAngleValueInRadians();
|
||
*aLineEnd = ComputeGradientLineEndFromAngle(*aLineStart, angle, aBoxSize);
|
||
} else {
|
||
// No angle, the line end is just the reflection of the start point
|
||
// through the center of the box
|
||
*aLineEnd = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineStart;
|
||
}
|
||
}
|
||
}
|
||
|
||
// Compute the start and end points of the gradient line for a radial gradient.
|
||
// Also returns the horizontal and vertical radii defining the circle or
|
||
// ellipse to use.
|
||
static void
|
||
ComputeRadialGradientLine(nsPresContext* aPresContext,
|
||
nsStyleGradient* aGradient,
|
||
const gfxSize& aBoxSize,
|
||
gfxPoint* aLineStart,
|
||
gfxPoint* aLineEnd,
|
||
double* aRadiusX,
|
||
double* aRadiusY)
|
||
{
|
||
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
|
||
// Default line start point is the center of the box
|
||
*aLineStart = gfxPoint(aBoxSize.width/2, aBoxSize.height/2);
|
||
} else {
|
||
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
|
||
*aLineStart = gfxPoint(
|
||
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
|
||
appUnitsPerPixel),
|
||
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
|
||
appUnitsPerPixel));
|
||
}
|
||
|
||
// Compute gradient shape: the x and y radii of an ellipse.
|
||
double radiusX, radiusY;
|
||
double leftDistance = Abs(aLineStart->x);
|
||
double rightDistance = Abs(aBoxSize.width - aLineStart->x);
|
||
double topDistance = Abs(aLineStart->y);
|
||
double bottomDistance = Abs(aBoxSize.height - aLineStart->y);
|
||
switch (aGradient->mSize) {
|
||
case NS_STYLE_GRADIENT_SIZE_CLOSEST_SIDE:
|
||
radiusX = std::min(leftDistance, rightDistance);
|
||
radiusY = std::min(topDistance, bottomDistance);
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
|
||
radiusX = radiusY = std::min(radiusX, radiusY);
|
||
}
|
||
break;
|
||
case NS_STYLE_GRADIENT_SIZE_CLOSEST_CORNER: {
|
||
// Compute x and y distances to nearest corner
|
||
double offsetX = std::min(leftDistance, rightDistance);
|
||
double offsetY = std::min(topDistance, bottomDistance);
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
|
||
radiusX = radiusY = NS_hypot(offsetX, offsetY);
|
||
} else {
|
||
// maintain aspect ratio
|
||
radiusX = offsetX*M_SQRT2;
|
||
radiusY = offsetY*M_SQRT2;
|
||
}
|
||
break;
|
||
}
|
||
case NS_STYLE_GRADIENT_SIZE_FARTHEST_SIDE:
|
||
radiusX = std::max(leftDistance, rightDistance);
|
||
radiusY = std::max(topDistance, bottomDistance);
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
|
||
radiusX = radiusY = std::max(radiusX, radiusY);
|
||
}
|
||
break;
|
||
case NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER: {
|
||
// Compute x and y distances to nearest corner
|
||
double offsetX = std::max(leftDistance, rightDistance);
|
||
double offsetY = std::max(topDistance, bottomDistance);
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
|
||
radiusX = radiusY = NS_hypot(offsetX, offsetY);
|
||
} else {
|
||
// maintain aspect ratio
|
||
radiusX = offsetX*M_SQRT2;
|
||
radiusY = offsetY*M_SQRT2;
|
||
}
|
||
break;
|
||
}
|
||
case NS_STYLE_GRADIENT_SIZE_EXPLICIT_SIZE: {
|
||
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
|
||
radiusX = ConvertGradientValueToPixels(aGradient->mRadiusX,
|
||
aBoxSize.width, appUnitsPerPixel);
|
||
radiusY = ConvertGradientValueToPixels(aGradient->mRadiusY,
|
||
aBoxSize.height, appUnitsPerPixel);
|
||
break;
|
||
}
|
||
default:
|
||
radiusX = radiusY = 0;
|
||
NS_ABORT_IF_FALSE(false, "unknown radial gradient sizing method");
|
||
}
|
||
*aRadiusX = radiusX;
|
||
*aRadiusY = radiusY;
|
||
|
||
double angle;
|
||
if (aGradient->mAngle.IsAngleValue()) {
|
||
angle = aGradient->mAngle.GetAngleValueInRadians();
|
||
} else {
|
||
// Default angle is 0deg
|
||
angle = 0.0;
|
||
}
|
||
|
||
// The gradient line end point is where the gradient line intersects
|
||
// the ellipse.
|
||
*aLineEnd = *aLineStart + gfxPoint(radiusX*cos(-angle), radiusY*sin(-angle));
|
||
}
|
||
|
||
|
||
static float Interpolate(float aF1, float aF2, float aFrac)
|
||
{
|
||
return aF1 + aFrac * (aF2 - aF1);
|
||
}
|
||
|
||
// Returns aFrac*aC2 + (1 - aFrac)*C1. The interpolation is done
|
||
// in unpremultiplied space, which is what SVG gradients and cairo
|
||
// gradients expect.
|
||
static gfxRGBA
|
||
InterpolateColor(const gfxRGBA& aC1, const gfxRGBA& aC2, double aFrac)
|
||
{
|
||
double other = 1 - aFrac;
|
||
return gfxRGBA(aC2.r*aFrac + aC1.r*other,
|
||
aC2.g*aFrac + aC1.g*other,
|
||
aC2.b*aFrac + aC1.b*other,
|
||
aC2.a*aFrac + aC1.a*other);
|
||
}
|
||
|
||
static nscoord
|
||
FindTileStart(nscoord aDirtyCoord, nscoord aTilePos, nscoord aTileDim)
|
||
{
|
||
NS_ASSERTION(aTileDim > 0, "Non-positive tile dimension");
|
||
double multiples = floor(double(aDirtyCoord - aTilePos)/aTileDim);
|
||
return NSToCoordRound(multiples*aTileDim + aTilePos);
|
||
}
|
||
|
||
static gfxFloat
|
||
LinearGradientStopPositionForPoint(const gfxPoint& aGradientStart,
|
||
const gfxPoint& aGradientEnd,
|
||
const gfxPoint& aPoint)
|
||
{
|
||
gfxPoint d = aGradientEnd - aGradientStart;
|
||
gfxPoint p = aPoint - aGradientStart;
|
||
/**
|
||
* Compute a parameter t such that a line perpendicular to the
|
||
* d vector, passing through aGradientStart + d*t, also
|
||
* passes through aPoint.
|
||
*
|
||
* t is given by
|
||
* (p.x - d.x*t)*d.x + (p.y - d.y*t)*d.y = 0
|
||
*
|
||
* Solving for t we get
|
||
* numerator = d.x*p.x + d.y*p.y
|
||
* denominator = d.x^2 + d.y^2
|
||
* t = numerator/denominator
|
||
*
|
||
* In nsCSSRendering::PaintGradient we know the length of d
|
||
* is not zero.
|
||
*/
|
||
double numerator = d.x * p.x + d.y * p.y;
|
||
double denominator = d.x * d.x + d.y * d.y;
|
||
return numerator / denominator;
|
||
}
|
||
|
||
static bool
|
||
RectIsBeyondLinearGradientEdge(const gfxRect& aRect,
|
||
const gfxMatrix& aPatternMatrix,
|
||
const nsTArray<ColorStop>& aStops,
|
||
const gfxPoint& aGradientStart,
|
||
const gfxPoint& aGradientEnd,
|
||
gfxRGBA* aOutEdgeColor)
|
||
{
|
||
gfxFloat topLeft = LinearGradientStopPositionForPoint(
|
||
aGradientStart, aGradientEnd, aPatternMatrix.Transform(aRect.TopLeft()));
|
||
gfxFloat topRight = LinearGradientStopPositionForPoint(
|
||
aGradientStart, aGradientEnd, aPatternMatrix.Transform(aRect.TopRight()));
|
||
gfxFloat bottomLeft = LinearGradientStopPositionForPoint(
|
||
aGradientStart, aGradientEnd, aPatternMatrix.Transform(aRect.BottomLeft()));
|
||
gfxFloat bottomRight = LinearGradientStopPositionForPoint(
|
||
aGradientStart, aGradientEnd, aPatternMatrix.Transform(aRect.BottomRight()));
|
||
|
||
const ColorStop& firstStop = aStops[0];
|
||
if (topLeft < firstStop.mPosition && topRight < firstStop.mPosition &&
|
||
bottomLeft < firstStop.mPosition && bottomRight < firstStop.mPosition) {
|
||
*aOutEdgeColor = firstStop.mColor;
|
||
return true;
|
||
}
|
||
|
||
const ColorStop& lastStop = aStops.LastElement();
|
||
if (topLeft >= lastStop.mPosition && topRight >= lastStop.mPosition &&
|
||
bottomLeft >= lastStop.mPosition && bottomRight >= lastStop.mPosition) {
|
||
*aOutEdgeColor = lastStop.mColor;
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
static void ResolveMidpoints(nsTArray<ColorStop>& stops)
|
||
{
|
||
for (size_t x = 1; x < stops.Length() - 1;) {
|
||
if (!stops[x].mIsMidpoint) {
|
||
x++;
|
||
continue;
|
||
}
|
||
|
||
gfxRGBA color1 = stops[x-1].mColor;
|
||
gfxRGBA color2 = stops[x+1].mColor;
|
||
float offset1 = stops[x-1].mPosition;
|
||
float offset2 = stops[x+1].mPosition;
|
||
float offset = stops[x].mPosition;
|
||
// check if everything coincides. If so, ignore the midpoint.
|
||
if (offset - offset1 == offset2 - offset) {
|
||
stops.RemoveElementAt(x);
|
||
continue;
|
||
}
|
||
|
||
// Check if we coincide with the left colorstop.
|
||
if (offset1 == offset) {
|
||
// Morph the midpoint to a regular stop with the color of the next
|
||
// color stop.
|
||
stops[x].mColor = color2;
|
||
stops[x].mIsMidpoint = false;
|
||
continue;
|
||
}
|
||
|
||
// Check if we coincide with the right colorstop.
|
||
if (offset2 == offset) {
|
||
// Morph the midpoint to a regular stop with the color of the previous
|
||
// color stop.
|
||
stops[x].mColor = color1;
|
||
stops[x].mIsMidpoint = false;
|
||
continue;
|
||
}
|
||
|
||
float midpoint = (offset - offset1) / (offset2 - offset1);
|
||
ColorStop newStops[9];
|
||
if (midpoint > .5f) {
|
||
for (size_t y = 0; y < 7; y++) {
|
||
newStops[y].mPosition = offset1 + (offset - offset1) * (7 + y) / 13;
|
||
}
|
||
|
||
newStops[7].mPosition = offset + (offset2 - offset) / 3;
|
||
newStops[8].mPosition = offset + (offset2 - offset) * 2 / 3;
|
||
} else {
|
||
newStops[0].mPosition = offset1 + (offset - offset1) / 3;
|
||
newStops[1].mPosition = offset1 + (offset - offset1) * 2 / 3;
|
||
|
||
for (size_t y = 0; y < 7; y++) {
|
||
newStops[y+2].mPosition = offset + (offset2 - offset) * y / 13;
|
||
}
|
||
}
|
||
// calculate colors
|
||
|
||
for (size_t y = 0; y < 9; y++) {
|
||
// Calculate the intermediate color stops per the formula of the CSS images
|
||
// spec. http://dev.w3.org/csswg/css-images/#color-stop-syntax
|
||
// 9 points were chosen since it is the minimum number of stops that always
|
||
// give the smoothest appearace regardless of midpoint position and difference
|
||
// in luminance of the end points.
|
||
float relativeOffset = (newStops[y].mPosition - offset1) / (offset2 - offset1);
|
||
float multiplier = powf(relativeOffset, logf(.5f) / logf(midpoint));
|
||
|
||
gfxFloat red = color1.r + multiplier * (color2.r - color1.r);
|
||
gfxFloat green = color1.g + multiplier * (color2.g - color1.g);
|
||
gfxFloat blue = color1.b + multiplier * (color2.b - color1.b);
|
||
gfxFloat alpha = color1.a + multiplier * (color2.a - color1.a);
|
||
|
||
newStops[y].mColor = gfxRGBA(red, green, blue, alpha);
|
||
}
|
||
|
||
stops.ReplaceElementsAt(x, 1, newStops, 9);
|
||
x += 9;
|
||
}
|
||
}
|
||
|
||
static gfxRGBA
|
||
Premultiply(const gfxRGBA& aColor)
|
||
{
|
||
gfxFloat a = aColor.a;
|
||
return gfxRGBA(aColor.r * a, aColor.g * a, aColor.b * a, a);
|
||
}
|
||
|
||
static gfxRGBA
|
||
Unpremultiply(const gfxRGBA& aColor)
|
||
{
|
||
gfxFloat a = aColor.a;
|
||
return (a > 0.0) ? gfxRGBA(aColor.r / a, aColor.g / a, aColor.b / a, a) : aColor;
|
||
}
|
||
|
||
static gfxRGBA
|
||
TransparentColor(gfxRGBA aColor) {
|
||
aColor.a = 0;
|
||
return aColor;
|
||
}
|
||
|
||
// Adjusts and adds color stops in such a way that drawing the gradient with
|
||
// unpremultiplied interpolation looks nearly the same as if it were drawn with
|
||
// premultiplied interpolation.
|
||
static const float kAlphaIncrementPerGradientStep = 0.1f;
|
||
static void
|
||
ResolvePremultipliedAlpha(nsTArray<ColorStop>& aStops)
|
||
{
|
||
for (size_t x = 1; x < aStops.Length(); x++) {
|
||
const ColorStop leftStop = aStops[x - 1];
|
||
const ColorStop rightStop = aStops[x];
|
||
|
||
// if the left and right stop have the same alpha value, we don't need
|
||
// to do anything
|
||
if (leftStop.mColor.a == rightStop.mColor.a) {
|
||
continue;
|
||
}
|
||
|
||
// Is the stop on the left 100% transparent? If so, have it adopt the color
|
||
// of the right stop
|
||
if (leftStop.mColor.a == 0) {
|
||
aStops[x - 1].mColor = TransparentColor(rightStop.mColor);
|
||
continue;
|
||
}
|
||
|
||
// Is the stop on the right completely transparent?
|
||
// If so, duplicate it and assign it the color on the left.
|
||
if (rightStop.mColor.a == 0) {
|
||
ColorStop newStop = rightStop;
|
||
newStop.mColor = TransparentColor(leftStop.mColor);
|
||
aStops.InsertElementAt(x, newStop);
|
||
x++;
|
||
continue;
|
||
}
|
||
|
||
// Now handle cases where one or both of the stops are partially transparent.
|
||
if (leftStop.mColor.a != 1.0f || rightStop.mColor.a != 1.0f) {
|
||
gfxRGBA premulLeftColor = Premultiply(leftStop.mColor);
|
||
gfxRGBA premulRightColor = Premultiply(rightStop.mColor);
|
||
// Calculate how many extra steps. We do a step per 10% transparency.
|
||
size_t stepCount = NSToIntFloor(fabs(leftStop.mColor.a - rightStop.mColor.a) / kAlphaIncrementPerGradientStep);
|
||
for (size_t y = 1; y < stepCount; y++) {
|
||
float frac = static_cast<float>(y) / stepCount;
|
||
ColorStop newStop(Interpolate(leftStop.mPosition, rightStop.mPosition, frac), false,
|
||
Unpremultiply(InterpolateColor(premulLeftColor, premulRightColor, frac)));
|
||
aStops.InsertElementAt(x, newStop);
|
||
x++;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsStyleGradient* aGradient,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aDest,
|
||
const nsRect& aFillArea,
|
||
const CSSIntRect& aSrc,
|
||
const nsSize& aIntrinsicSize)
|
||
{
|
||
PROFILER_LABEL("nsCSSRendering", "PaintGradient",
|
||
js::ProfileEntry::Category::GRAPHICS);
|
||
|
||
Telemetry::AutoTimer<Telemetry::GRADIENT_DURATION, Telemetry::Microsecond> gradientTimer;
|
||
if (aDest.IsEmpty() || aFillArea.IsEmpty()) {
|
||
return;
|
||
}
|
||
|
||
gfxContext *ctx = aRenderingContext.ThebesContext();
|
||
nscoord appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
|
||
gfxSize srcSize = gfxSize(gfxFloat(aIntrinsicSize.width)/appUnitsPerDevPixel,
|
||
gfxFloat(aIntrinsicSize.height)/appUnitsPerDevPixel);
|
||
|
||
bool cellContainsFill = aDest.Contains(aFillArea);
|
||
|
||
// Compute "gradient line" start and end relative to the intrinsic size of
|
||
// the gradient.
|
||
gfxPoint lineStart, lineEnd;
|
||
double radiusX = 0, radiusY = 0; // for radial gradients only
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
|
||
ComputeLinearGradientLine(aPresContext, aGradient, srcSize,
|
||
&lineStart, &lineEnd);
|
||
} else {
|
||
ComputeRadialGradientLine(aPresContext, aGradient, srcSize,
|
||
&lineStart, &lineEnd, &radiusX, &radiusY);
|
||
}
|
||
gfxFloat lineLength = NS_hypot(lineEnd.x - lineStart.x,
|
||
lineEnd.y - lineStart.y);
|
||
|
||
NS_ABORT_IF_FALSE(aGradient->mStops.Length() >= 2,
|
||
"The parser should reject gradients with less than two stops");
|
||
|
||
// Build color stop array and compute stop positions
|
||
nsTArray<ColorStop> stops;
|
||
// If there is a run of stops before stop i that did not have specified
|
||
// positions, then this is the index of the first stop in that run, otherwise
|
||
// it's -1.
|
||
int32_t firstUnsetPosition = -1;
|
||
for (uint32_t i = 0; i < aGradient->mStops.Length(); ++i) {
|
||
const nsStyleGradientStop& stop = aGradient->mStops[i];
|
||
double position;
|
||
switch (stop.mLocation.GetUnit()) {
|
||
case eStyleUnit_None:
|
||
if (i == 0) {
|
||
// First stop defaults to position 0.0
|
||
position = 0.0;
|
||
} else if (i == aGradient->mStops.Length() - 1) {
|
||
// Last stop defaults to position 1.0
|
||
position = 1.0;
|
||
} else {
|
||
// Other stops with no specified position get their position assigned
|
||
// later by interpolation, see below.
|
||
// Remeber where the run of stops with no specified position starts,
|
||
// if it starts here.
|
||
if (firstUnsetPosition < 0) {
|
||
firstUnsetPosition = i;
|
||
}
|
||
stops.AppendElement(ColorStop(0, stop.mIsInterpolationHint, stop.mColor));
|
||
continue;
|
||
}
|
||
break;
|
||
case eStyleUnit_Percent:
|
||
position = stop.mLocation.GetPercentValue();
|
||
break;
|
||
case eStyleUnit_Coord:
|
||
position = lineLength < 1e-6 ? 0.0 :
|
||
stop.mLocation.GetCoordValue() / appUnitsPerDevPixel / lineLength;
|
||
break;
|
||
case eStyleUnit_Calc:
|
||
nsStyleCoord::Calc *calc;
|
||
calc = stop.mLocation.GetCalcValue();
|
||
position = calc->mPercent +
|
||
((lineLength < 1e-6) ? 0.0 :
|
||
(NSAppUnitsToFloatPixels(calc->mLength, appUnitsPerDevPixel) / lineLength));
|
||
break;
|
||
default:
|
||
NS_ABORT_IF_FALSE(false, "Unknown stop position type");
|
||
}
|
||
|
||
if (i > 0) {
|
||
// Prevent decreasing stop positions by advancing this position
|
||
// to the previous stop position, if necessary
|
||
position = std::max(position, stops[i - 1].mPosition);
|
||
}
|
||
stops.AppendElement(ColorStop(position, stop.mIsInterpolationHint, stop.mColor));
|
||
if (firstUnsetPosition > 0) {
|
||
// Interpolate positions for all stops that didn't have a specified position
|
||
double p = stops[firstUnsetPosition - 1].mPosition;
|
||
double d = (stops[i].mPosition - p)/(i - firstUnsetPosition + 1);
|
||
for (uint32_t j = firstUnsetPosition; j < i; ++j) {
|
||
p += d;
|
||
stops[j].mPosition = p;
|
||
}
|
||
firstUnsetPosition = -1;
|
||
}
|
||
}
|
||
|
||
// Eliminate negative-position stops if the gradient is radial.
|
||
double firstStop = stops[0].mPosition;
|
||
if (aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR && firstStop < 0.0) {
|
||
if (aGradient->mRepeating) {
|
||
// Choose an instance of the repeated pattern that gives us all positive
|
||
// stop-offsets.
|
||
double lastStop = stops[stops.Length() - 1].mPosition;
|
||
double stopDelta = lastStop - firstStop;
|
||
// If all the stops are in approximately the same place then logic below
|
||
// will kick in that makes us draw just the last stop color, so don't
|
||
// try to do anything in that case. We certainly need to avoid
|
||
// dividing by zero.
|
||
if (stopDelta >= 1e-6) {
|
||
double instanceCount = ceil(-firstStop/stopDelta);
|
||
// Advance stops by instanceCount multiples of the period of the
|
||
// repeating gradient.
|
||
double offset = instanceCount*stopDelta;
|
||
for (uint32_t i = 0; i < stops.Length(); i++) {
|
||
stops[i].mPosition += offset;
|
||
}
|
||
}
|
||
} else {
|
||
// Move negative-position stops to position 0.0. We may also need
|
||
// to set the color of the stop to the color the gradient should have
|
||
// at the center of the ellipse.
|
||
for (uint32_t i = 0; i < stops.Length(); i++) {
|
||
double pos = stops[i].mPosition;
|
||
if (pos < 0.0) {
|
||
stops[i].mPosition = 0.0;
|
||
// If this is the last stop, we don't need to adjust the color,
|
||
// it will fill the entire area.
|
||
if (i < stops.Length() - 1) {
|
||
double nextPos = stops[i + 1].mPosition;
|
||
// If nextPos is approximately equal to pos, then we don't
|
||
// need to adjust the color of this stop because it's
|
||
// not going to be displayed.
|
||
// If nextPos is negative, we don't need to adjust the color of
|
||
// this stop since it's not going to be displayed because
|
||
// nextPos will also be moved to 0.0.
|
||
if (nextPos >= 0.0 && nextPos - pos >= 1e-6) {
|
||
// Compute how far the new position 0.0 is along the interval
|
||
// between pos and nextPos.
|
||
// XXX Color interpolation (in cairo, too) should use the
|
||
// CSS 'color-interpolation' property!
|
||
double frac = (0.0 - pos)/(nextPos - pos);
|
||
stops[i].mColor =
|
||
InterpolateColor(stops[i].mColor, stops[i + 1].mColor, frac);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
firstStop = stops[0].mPosition;
|
||
NS_ABORT_IF_FALSE(firstStop >= 0.0, "Failed to fix stop offsets");
|
||
}
|
||
|
||
if (aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR && !aGradient->mRepeating) {
|
||
// Direct2D can only handle a particular class of radial gradients because
|
||
// of the way the it specifies gradients. Setting firstStop to 0, when we
|
||
// can, will help us stay on the fast path. Currently we don't do this
|
||
// for repeating gradients but we could by adjusting the stop collection
|
||
// to start at 0
|
||
firstStop = 0;
|
||
}
|
||
|
||
double lastStop = stops[stops.Length() - 1].mPosition;
|
||
// Cairo gradients must have stop positions in the range [0, 1]. So,
|
||
// stop positions will be normalized below by subtracting firstStop and then
|
||
// multiplying by stopScale.
|
||
double stopScale;
|
||
double stopOrigin = firstStop;
|
||
double stopEnd = lastStop;
|
||
double stopDelta = lastStop - firstStop;
|
||
bool zeroRadius = aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR &&
|
||
(radiusX < 1e-6 || radiusY < 1e-6);
|
||
if (stopDelta < 1e-6 || lineLength < 1e-6 || zeroRadius) {
|
||
// Stops are all at the same place. Map all stops to 0.0.
|
||
// For repeating radial gradients, or for any radial gradients with
|
||
// a zero radius, we need to fill with the last stop color, so just set
|
||
// both radii to 0.
|
||
if (aGradient->mRepeating || zeroRadius) {
|
||
radiusX = radiusY = 0.0;
|
||
}
|
||
stopDelta = 0.0;
|
||
lastStop = firstStop;
|
||
}
|
||
|
||
// Don't normalize non-repeating or degenerate gradients below 0..1
|
||
// This keeps the gradient line as large as the box and doesn't
|
||
// lets us avoiding having to get padding correct for stops
|
||
// at 0 and 1
|
||
if (!aGradient->mRepeating || stopDelta == 0.0) {
|
||
stopOrigin = std::min(stopOrigin, 0.0);
|
||
stopEnd = std::max(stopEnd, 1.0);
|
||
}
|
||
stopScale = 1.0/(stopEnd - stopOrigin);
|
||
|
||
// Create the gradient pattern.
|
||
nsRefPtr<gfxPattern> gradientPattern;
|
||
bool forceRepeatToCoverTiles = false;
|
||
gfxMatrix matrix;
|
||
gfxPoint gradientStart;
|
||
gfxPoint gradientEnd;
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
|
||
// Compute the actual gradient line ends we need to pass to cairo after
|
||
// stops have been normalized.
|
||
gradientStart = lineStart + (lineEnd - lineStart)*stopOrigin;
|
||
gradientEnd = lineStart + (lineEnd - lineStart)*stopEnd;
|
||
gfxPoint gradientStopStart = lineStart + (lineEnd - lineStart)*firstStop;
|
||
gfxPoint gradientStopEnd = lineStart + (lineEnd - lineStart)*lastStop;
|
||
|
||
if (stopDelta == 0.0) {
|
||
// Stops are all at the same place. For repeating gradients, this will
|
||
// just paint the last stop color. We don't need to do anything.
|
||
// For non-repeating gradients, this should render as two colors, one
|
||
// on each "side" of the gradient line segment, which is a point. All
|
||
// our stops will be at 0.0; we just need to set the direction vector
|
||
// correctly.
|
||
gradientEnd = gradientStart + (lineEnd - lineStart);
|
||
gradientStopEnd = gradientStopStart + (lineEnd - lineStart);
|
||
}
|
||
|
||
gradientPattern = new gfxPattern(gradientStart.x, gradientStart.y,
|
||
gradientEnd.x, gradientEnd.y);
|
||
|
||
// When the gradient line is parallel to the x axis from the left edge
|
||
// to the right edge of a tile, then we can repeat by just repeating the
|
||
// gradient.
|
||
if (!cellContainsFill &&
|
||
((gradientStopStart.y == gradientStopEnd.y && gradientStopStart.x == 0 &&
|
||
gradientStopEnd.x == srcSize.width) ||
|
||
(gradientStopStart.x == gradientStopEnd.x && gradientStopStart.y == 0 &&
|
||
gradientStopEnd.y == srcSize.height))) {
|
||
forceRepeatToCoverTiles = true;
|
||
}
|
||
} else {
|
||
NS_ASSERTION(firstStop >= 0.0,
|
||
"Negative stops not allowed for radial gradients");
|
||
|
||
// To form an ellipse, we'll stretch a circle vertically, if necessary.
|
||
// So our radii are based on radiusX.
|
||
double innerRadius = radiusX*stopOrigin;
|
||
double outerRadius = radiusX*stopEnd;
|
||
if (stopDelta == 0.0) {
|
||
// Stops are all at the same place. See above (except we now have
|
||
// the inside vs. outside of an ellipse).
|
||
outerRadius = innerRadius + 1;
|
||
}
|
||
gradientPattern = new gfxPattern(lineStart.x, lineStart.y, innerRadius,
|
||
lineStart.x, lineStart.y, outerRadius);
|
||
if (radiusX != radiusY) {
|
||
// Stretch the circles into ellipses vertically by setting a transform
|
||
// in the pattern.
|
||
// Recall that this is the transform from user space to pattern space.
|
||
// So to stretch the ellipse by factor of P vertically, we scale
|
||
// user coordinates by 1/P.
|
||
matrix.Translate(lineStart);
|
||
matrix.Scale(1.0, radiusX/radiusY);
|
||
matrix.Translate(-lineStart);
|
||
}
|
||
}
|
||
// Use a pattern transform to take account of source and dest rects
|
||
matrix.Translate(gfxPoint(aPresContext->CSSPixelsToDevPixels(aSrc.x),
|
||
aPresContext->CSSPixelsToDevPixels(aSrc.y)));
|
||
matrix.Scale(gfxFloat(aPresContext->CSSPixelsToAppUnits(aSrc.width))/aDest.width,
|
||
gfxFloat(aPresContext->CSSPixelsToAppUnits(aSrc.height))/aDest.height);
|
||
gradientPattern->SetMatrix(matrix);
|
||
|
||
if (gradientPattern->CairoStatus())
|
||
return;
|
||
|
||
if (stopDelta == 0.0) {
|
||
// Non-repeating gradient with all stops in same place -> just add
|
||
// first stop and last stop, both at position 0.
|
||
// Repeating gradient with all stops in the same place, or radial
|
||
// gradient with radius of 0 -> just paint the last stop color.
|
||
// We use firstStop offset to keep |stops| with same units (will later normalize to 0).
|
||
gfxRGBA firstColor(stops[0].mColor);
|
||
gfxRGBA lastColor(stops.LastElement().mColor);
|
||
stops.Clear();
|
||
|
||
if (!aGradient->mRepeating && !zeroRadius) {
|
||
stops.AppendElement(ColorStop(firstStop, false, firstColor));
|
||
}
|
||
stops.AppendElement(ColorStop(firstStop, false, lastColor));
|
||
}
|
||
|
||
ResolveMidpoints(stops);
|
||
ResolvePremultipliedAlpha(stops);
|
||
|
||
bool isRepeat = aGradient->mRepeating || forceRepeatToCoverTiles;
|
||
|
||
// Now set normalized color stops in pattern.
|
||
// Offscreen gradient surface cache (not a tile):
|
||
// On some backends (e.g. D2D), the GradientStops object holds an offscreen surface
|
||
// which is a lookup table used to evaluate the gradient. This surface can use
|
||
// much memory (ram and/or GPU ram) and can be expensive to create. So we cache it.
|
||
// The cache key correlates 1:1 with the arguments for CreateGradientStops (also the implied backend type)
|
||
// Note that GradientStop is a simple struct with a stop value (while GradientStops has the surface).
|
||
nsTArray<gfx::GradientStop> rawStops(stops.Length());
|
||
rawStops.SetLength(stops.Length());
|
||
for(uint32_t i = 0; i < stops.Length(); i++) {
|
||
rawStops[i].color = gfx::Color(stops[i].mColor.r, stops[i].mColor.g, stops[i].mColor.b, stops[i].mColor.a);
|
||
rawStops[i].offset = stopScale * (stops[i].mPosition - stopOrigin);
|
||
}
|
||
mozilla::RefPtr<mozilla::gfx::GradientStops> gs =
|
||
gfxGradientCache::GetOrCreateGradientStops(ctx->GetDrawTarget(),
|
||
rawStops,
|
||
isRepeat ? gfx::ExtendMode::REPEAT : gfx::ExtendMode::CLAMP);
|
||
gradientPattern->SetColorStops(gs);
|
||
|
||
// Paint gradient tiles. This isn't terribly efficient, but doing it this
|
||
// way is simple and sure to get pixel-snapping right. We could speed things
|
||
// up by drawing tiles into temporary surfaces and copying those to the
|
||
// destination, but after pixel-snapping tiles may not all be the same size.
|
||
nsRect dirty;
|
||
if (!dirty.IntersectRect(aDirtyRect, aFillArea))
|
||
return;
|
||
|
||
gfxRect areaToFill =
|
||
nsLayoutUtils::RectToGfxRect(aFillArea, appUnitsPerDevPixel);
|
||
gfxRect dirtyAreaToFill = nsLayoutUtils::RectToGfxRect(dirty, appUnitsPerDevPixel);
|
||
dirtyAreaToFill.RoundOut();
|
||
|
||
gfxMatrix ctm = ctx->CurrentMatrix();
|
||
bool isCTMPreservingAxisAlignedRectangles = ctm.PreservesAxisAlignedRectangles();
|
||
|
||
// xStart/yStart are the top-left corner of the top-left tile.
|
||
nscoord xStart = FindTileStart(dirty.x, aDest.x, aDest.width);
|
||
nscoord yStart = FindTileStart(dirty.y, aDest.y, aDest.height);
|
||
nscoord xEnd = forceRepeatToCoverTiles ? xStart + aDest.width : dirty.XMost();
|
||
nscoord yEnd = forceRepeatToCoverTiles ? yStart + aDest.height : dirty.YMost();
|
||
|
||
// x and y are the top-left corner of the tile to draw
|
||
for (nscoord y = yStart; y < yEnd; y += aDest.height) {
|
||
for (nscoord x = xStart; x < xEnd; x += aDest.width) {
|
||
// The coordinates of the tile
|
||
gfxRect tileRect = nsLayoutUtils::RectToGfxRect(
|
||
nsRect(x, y, aDest.width, aDest.height),
|
||
appUnitsPerDevPixel);
|
||
// The actual area to fill with this tile is the intersection of this
|
||
// tile with the overall area we're supposed to be filling
|
||
gfxRect fillRect =
|
||
forceRepeatToCoverTiles ? areaToFill : tileRect.Intersect(areaToFill);
|
||
// Try snapping the fill rect. Snap its top-left and bottom-right
|
||
// independently to preserve the orientation.
|
||
gfxPoint snappedFillRectTopLeft = fillRect.TopLeft();
|
||
gfxPoint snappedFillRectTopRight = fillRect.TopRight();
|
||
gfxPoint snappedFillRectBottomRight = fillRect.BottomRight();
|
||
// Snap three points instead of just two to ensure we choose the
|
||
// correct orientation if there's a reflection.
|
||
if (isCTMPreservingAxisAlignedRectangles &&
|
||
ctx->UserToDevicePixelSnapped(snappedFillRectTopLeft, true) &&
|
||
ctx->UserToDevicePixelSnapped(snappedFillRectBottomRight, true) &&
|
||
ctx->UserToDevicePixelSnapped(snappedFillRectTopRight, true)) {
|
||
if (snappedFillRectTopLeft.x == snappedFillRectBottomRight.x ||
|
||
snappedFillRectTopLeft.y == snappedFillRectBottomRight.y) {
|
||
// Nothing to draw; avoid scaling by zero and other weirdness that
|
||
// could put the context in an error state.
|
||
continue;
|
||
}
|
||
// Set the context's transform to the transform that maps fillRect to
|
||
// snappedFillRect. The part of the gradient that was going to
|
||
// exactly fill fillRect will fill snappedFillRect instead.
|
||
gfxMatrix transform = gfxUtils::TransformRectToRect(fillRect,
|
||
snappedFillRectTopLeft, snappedFillRectTopRight,
|
||
snappedFillRectBottomRight);
|
||
ctx->SetMatrix(transform);
|
||
}
|
||
ctx->NewPath();
|
||
ctx->Rectangle(fillRect);
|
||
|
||
gfxRect dirtyFillRect = fillRect.Intersect(dirtyAreaToFill);
|
||
gfxRect fillRectRelativeToTile = dirtyFillRect - tileRect.TopLeft();
|
||
gfxRGBA edgeColor;
|
||
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR && !isRepeat &&
|
||
RectIsBeyondLinearGradientEdge(fillRectRelativeToTile, matrix, stops,
|
||
gradientStart, gradientEnd, &edgeColor)) {
|
||
ctx->SetColor(edgeColor);
|
||
} else {
|
||
ctx->SetMatrix(
|
||
ctx->CurrentMatrix().Copy().Translate(tileRect.TopLeft()));
|
||
ctx->SetPattern(gradientPattern);
|
||
}
|
||
ctx->Fill();
|
||
ctx->SetMatrix(ctm);
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aBorderArea,
|
||
nsStyleContext* aBackgroundSC,
|
||
const nsStyleBorder& aBorder,
|
||
uint32_t aFlags,
|
||
nsRect* aBGClipRect,
|
||
int32_t aLayer)
|
||
{
|
||
NS_PRECONDITION(aForFrame,
|
||
"Frame is expected to be provided to PaintBackground");
|
||
|
||
// Check to see if we have an appearance defined. If so, we let the theme
|
||
// renderer draw the background and bail out.
|
||
// XXXzw this ignores aBGClipRect.
|
||
const nsStyleDisplay* displayData = aForFrame->StyleDisplay();
|
||
if (displayData->mAppearance) {
|
||
nsITheme *theme = aPresContext->GetTheme();
|
||
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame,
|
||
displayData->mAppearance)) {
|
||
nsRect drawing(aBorderArea);
|
||
theme->GetWidgetOverflow(aPresContext->DeviceContext(),
|
||
aForFrame, displayData->mAppearance, &drawing);
|
||
drawing.IntersectRect(drawing, aDirtyRect);
|
||
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
|
||
displayData->mAppearance, aBorderArea,
|
||
drawing);
|
||
return;
|
||
}
|
||
}
|
||
|
||
// For canvas frames (in the CSS sense) we draw the background color using
|
||
// a solid color item that gets added in nsLayoutUtils::PaintFrame,
|
||
// or nsSubDocumentFrame::BuildDisplayList (bug 488242). (The solid
|
||
// color may be moved into nsDisplayCanvasBackground by
|
||
// nsPresShell::AddCanvasBackgroundColorItem, and painted by
|
||
// nsDisplayCanvasBackground directly.) Either way we don't need to
|
||
// paint the background color here.
|
||
bool isCanvasFrame = IsCanvasFrame(aForFrame);
|
||
|
||
// Determine whether we are drawing background images and/or
|
||
// background colors.
|
||
bool drawBackgroundImage;
|
||
bool drawBackgroundColor;
|
||
|
||
nscolor bgColor = DetermineBackgroundColor(aPresContext,
|
||
aBackgroundSC,
|
||
aForFrame,
|
||
drawBackgroundImage,
|
||
drawBackgroundColor);
|
||
|
||
// If we're drawing a specific layer, we don't want to draw the
|
||
// background color.
|
||
const nsStyleBackground *bg = aBackgroundSC->StyleBackground();
|
||
if (drawBackgroundColor && aLayer >= 0) {
|
||
drawBackgroundColor = false;
|
||
}
|
||
|
||
// At this point, drawBackgroundImage and drawBackgroundColor are
|
||
// true if and only if we are actually supposed to paint an image or
|
||
// color into aDirtyRect, respectively.
|
||
if (!drawBackgroundImage && !drawBackgroundColor)
|
||
return;
|
||
|
||
// Compute the outermost boundary of the area that might be painted.
|
||
// Same coordinate space as aBorderArea & aBGClipRect.
|
||
Sides skipSides = aForFrame->GetSkipSides();
|
||
nsRect paintBorderArea =
|
||
::BoxDecorationRectForBackground(aForFrame, aBorderArea, skipSides, &aBorder);
|
||
nsRect clipBorderArea =
|
||
::BoxDecorationRectForBorder(aForFrame, aBorderArea, skipSides, &aBorder);
|
||
|
||
// The 'bgClipArea' (used only by the image tiling logic, far below)
|
||
// is the caller-provided aBGClipRect if any, or else the area
|
||
// determined by the value of 'background-clip' in
|
||
// SetupCurrentBackgroundClip. (Arguably it should be the
|
||
// intersection, but that breaks the table painter -- in particular,
|
||
// taking the intersection breaks reftests/bugs/403249-1[ab].)
|
||
gfxContext* ctx = aRenderingContext.ThebesContext();
|
||
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
|
||
BackgroundClipState clipState;
|
||
if (aBGClipRect) {
|
||
clipState.mBGClipArea = *aBGClipRect;
|
||
clipState.mCustomClip = true;
|
||
clipState.mHasRoundedCorners = false;
|
||
SetupDirtyRects(clipState.mBGClipArea, aDirtyRect, appUnitsPerPixel,
|
||
&clipState.mDirtyRect, &clipState.mDirtyRectGfx);
|
||
} else {
|
||
GetBackgroundClip(bg->BottomLayer(),
|
||
aForFrame, aBorder, aBorderArea,
|
||
aDirtyRect, (aFlags & PAINTBG_WILL_PAINT_BORDER), appUnitsPerPixel,
|
||
&clipState);
|
||
}
|
||
|
||
// If we might be using a background color, go ahead and set it now.
|
||
if (drawBackgroundColor && !isCanvasFrame)
|
||
ctx->SetColor(gfxRGBA(bgColor));
|
||
|
||
// NOTE: no Save() yet, we do that later by calling autoSR.EnsureSaved(ctx)
|
||
// in the cases we need it.
|
||
gfxContextAutoSaveRestore autoSR;
|
||
|
||
// If there is no background image, draw a color. (If there is
|
||
// neither a background image nor a color, we wouldn't have gotten
|
||
// this far.)
|
||
if (!drawBackgroundImage) {
|
||
if (!isCanvasFrame) {
|
||
DrawBackgroundColor(clipState, ctx, appUnitsPerPixel);
|
||
}
|
||
return;
|
||
}
|
||
|
||
if (bg->mImageCount < 1) {
|
||
// Return if there are no background layers, all work from this point
|
||
// onwards happens iteratively on these.
|
||
return;
|
||
}
|
||
|
||
// Validate the layer range before we start iterating.
|
||
int32_t startLayer = aLayer;
|
||
int32_t nLayers = 1;
|
||
if (startLayer < 0) {
|
||
startLayer = (int32_t)bg->mImageCount - 1;
|
||
nLayers = bg->mImageCount;
|
||
}
|
||
|
||
// Ensure we get invalidated for loads of the image. We need to do
|
||
// this here because this might be the only code that knows about the
|
||
// association of the style data with the frame.
|
||
if (aBackgroundSC != aForFrame->StyleContext()) {
|
||
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT_WITH_RANGE(i, bg, startLayer, nLayers) {
|
||
aForFrame->AssociateImage(bg->mLayers[i].mImage, aPresContext);
|
||
}
|
||
}
|
||
|
||
// The background color is rendered over the entire dirty area,
|
||
// even if the image isn't.
|
||
if (drawBackgroundColor && !isCanvasFrame) {
|
||
DrawBackgroundColor(clipState, ctx, appUnitsPerPixel);
|
||
}
|
||
|
||
if (drawBackgroundImage) {
|
||
bool clipSet = false;
|
||
uint8_t currentBackgroundClip = NS_STYLE_BG_CLIP_BORDER;
|
||
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT_WITH_RANGE(i, bg, bg->mImageCount - 1,
|
||
nLayers + (bg->mImageCount -
|
||
startLayer - 1)) {
|
||
const nsStyleBackground::Layer &layer = bg->mLayers[i];
|
||
if (!aBGClipRect) {
|
||
if (currentBackgroundClip != layer.mClip || !clipSet) {
|
||
currentBackgroundClip = layer.mClip;
|
||
// If clipSet is false that means this is the bottom layer and we
|
||
// already called GetBackgroundClip above and it stored its results
|
||
// in clipState.
|
||
if (clipSet) {
|
||
autoSR.Restore(); // reset the previous one
|
||
GetBackgroundClip(layer, aForFrame,
|
||
aBorder, aBorderArea, aDirtyRect, (aFlags & PAINTBG_WILL_PAINT_BORDER),
|
||
appUnitsPerPixel, &clipState);
|
||
}
|
||
SetupBackgroundClip(clipState, ctx, appUnitsPerPixel, &autoSR);
|
||
clipSet = true;
|
||
if (!clipBorderArea.IsEqualEdges(aBorderArea)) {
|
||
// We're drawing the background for the joined continuation boxes
|
||
// so we need to clip that to the slice that we want for this frame.
|
||
gfxRect clip =
|
||
nsLayoutUtils::RectToGfxRect(aBorderArea, appUnitsPerPixel);
|
||
autoSR.EnsureSaved(ctx);
|
||
ctx->NewPath();
|
||
ctx->SnappedRectangle(clip);
|
||
ctx->Clip();
|
||
}
|
||
}
|
||
}
|
||
if ((aLayer < 0 || i == (uint32_t)startLayer) &&
|
||
!clipState.mDirtyRectGfx.IsEmpty()) {
|
||
nsBackgroundLayerState state = PrepareBackgroundLayer(aPresContext, aForFrame,
|
||
aFlags, paintBorderArea, clipState.mBGClipArea, layer);
|
||
if (!state.mFillArea.IsEmpty()) {
|
||
if (state.mCompositingOp != gfxContext::OPERATOR_OVER) {
|
||
NS_ASSERTION(ctx->CurrentOperator() == gfxContext::OPERATOR_OVER,
|
||
"It is assumed the initial operator is OPERATOR_OVER, when it is restored later");
|
||
ctx->SetOperator(state.mCompositingOp);
|
||
}
|
||
state.mImageRenderer.DrawBackground(aPresContext, aRenderingContext,
|
||
state.mDestArea, state.mFillArea,
|
||
state.mAnchor + paintBorderArea.TopLeft(),
|
||
clipState.mDirtyRect);
|
||
if (state.mCompositingOp != gfxContext::OPERATOR_OVER) {
|
||
ctx->SetOperator(gfxContext::OPERATOR_OVER);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
static inline bool
|
||
IsTransformed(nsIFrame* aForFrame, nsIFrame* aTopFrame)
|
||
{
|
||
for (nsIFrame* f = aForFrame; f != aTopFrame; f = f->GetParent()) {
|
||
if (f->IsTransformed()) {
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
nsRect
|
||
nsCSSRendering::ComputeBackgroundPositioningArea(nsPresContext* aPresContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aBorderArea,
|
||
const nsStyleBackground::Layer& aLayer,
|
||
nsIFrame** aAttachedToFrame)
|
||
{
|
||
// Compute background origin area relative to aBorderArea now as we may need
|
||
// it to compute the effective image size for a CSS gradient.
|
||
nsRect bgPositioningArea;
|
||
|
||
nsIAtom* frameType = aForFrame->GetType();
|
||
nsIFrame* geometryFrame = aForFrame;
|
||
if (MOZ_UNLIKELY(frameType == nsGkAtoms::scrollFrame &&
|
||
NS_STYLE_BG_ATTACHMENT_LOCAL == aLayer.mAttachment)) {
|
||
nsIScrollableFrame* scrollableFrame = do_QueryFrame(aForFrame);
|
||
bgPositioningArea = nsRect(
|
||
scrollableFrame->GetScrolledFrame()->GetPosition()
|
||
// For the dir=rtl case:
|
||
+ scrollableFrame->GetScrollRange().TopLeft(),
|
||
scrollableFrame->GetScrolledRect().Size());
|
||
// The ScrolledRect’s size does not include the borders or scrollbars,
|
||
// reverse the handling of background-origin
|
||
// compared to the common case below.
|
||
if (aLayer.mOrigin == NS_STYLE_BG_ORIGIN_BORDER) {
|
||
nsMargin border = geometryFrame->GetUsedBorder();
|
||
border.ApplySkipSides(geometryFrame->GetSkipSides());
|
||
bgPositioningArea.Inflate(border);
|
||
bgPositioningArea.Inflate(scrollableFrame->GetActualScrollbarSizes());
|
||
} else if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
|
||
nsMargin padding = geometryFrame->GetUsedPadding();
|
||
padding.ApplySkipSides(geometryFrame->GetSkipSides());
|
||
bgPositioningArea.Deflate(padding);
|
||
NS_ASSERTION(aLayer.mOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
|
||
"unknown background-origin value");
|
||
}
|
||
*aAttachedToFrame = aForFrame;
|
||
return bgPositioningArea;
|
||
}
|
||
|
||
if (MOZ_UNLIKELY(frameType == nsGkAtoms::canvasFrame)) {
|
||
geometryFrame = aForFrame->GetFirstPrincipalChild();
|
||
// geometryFrame might be null if this canvas is a page created
|
||
// as an overflow container (e.g. the in-flow content has already
|
||
// finished and this page only displays the continuations of
|
||
// absolutely positioned content).
|
||
if (geometryFrame) {
|
||
bgPositioningArea = geometryFrame->GetRect();
|
||
}
|
||
} else {
|
||
bgPositioningArea = nsRect(nsPoint(0,0), aBorderArea.Size());
|
||
}
|
||
|
||
// Background images are tiled over the 'background-clip' area
|
||
// but the origin of the tiling is based on the 'background-origin' area
|
||
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_BORDER && geometryFrame) {
|
||
nsMargin border = geometryFrame->GetUsedBorder();
|
||
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
|
||
border += geometryFrame->GetUsedPadding();
|
||
NS_ASSERTION(aLayer.mOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
|
||
"unknown background-origin value");
|
||
}
|
||
bgPositioningArea.Deflate(border);
|
||
}
|
||
|
||
nsIFrame* attachedToFrame = aForFrame;
|
||
if (NS_STYLE_BG_ATTACHMENT_FIXED == aLayer.mAttachment) {
|
||
// If it's a fixed background attachment, then the image is placed
|
||
// relative to the viewport, which is the area of the root frame
|
||
// in a screen context or the page content frame in a print context.
|
||
attachedToFrame = aPresContext->PresShell()->FrameManager()->GetRootFrame();
|
||
NS_ASSERTION(attachedToFrame, "no root frame");
|
||
nsIFrame* pageContentFrame = nullptr;
|
||
if (aPresContext->IsPaginated()) {
|
||
pageContentFrame =
|
||
nsLayoutUtils::GetClosestFrameOfType(aForFrame, nsGkAtoms::pageContentFrame);
|
||
if (pageContentFrame) {
|
||
attachedToFrame = pageContentFrame;
|
||
}
|
||
// else this is an embedded shell and its root frame is what we want
|
||
}
|
||
|
||
// Set the background positioning area to the viewport's area
|
||
// (relative to aForFrame)
|
||
bgPositioningArea =
|
||
nsRect(-aForFrame->GetOffsetTo(attachedToFrame), attachedToFrame->GetSize());
|
||
|
||
if (!pageContentFrame) {
|
||
// Subtract the size of scrollbars.
|
||
nsIScrollableFrame* scrollableFrame =
|
||
aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
|
||
if (scrollableFrame) {
|
||
nsMargin scrollbars = scrollableFrame->GetActualScrollbarSizes();
|
||
bgPositioningArea.Deflate(scrollbars);
|
||
}
|
||
}
|
||
}
|
||
*aAttachedToFrame = attachedToFrame;
|
||
|
||
return bgPositioningArea;
|
||
}
|
||
|
||
// Apply the CSS image sizing algorithm as it applies to background images.
|
||
// See http://www.w3.org/TR/css3-background/#the-background-size .
|
||
// aIntrinsicSize is the size that the background image 'would like to be'.
|
||
// It can be found by calling nsImageRenderer::ComputeIntrinsicSize.
|
||
static nsSize
|
||
ComputeDrawnSizeForBackground(const CSSSizeOrRatio& aIntrinsicSize,
|
||
const nsSize& aBgPositioningArea,
|
||
const nsStyleBackground::Size& aLayerSize)
|
||
{
|
||
// Size is dictated by cover or contain rules.
|
||
if (aLayerSize.mWidthType == nsStyleBackground::Size::eContain ||
|
||
aLayerSize.mWidthType == nsStyleBackground::Size::eCover) {
|
||
nsImageRenderer::FitType fitType =
|
||
aLayerSize.mWidthType == nsStyleBackground::Size::eCover
|
||
? nsImageRenderer::COVER
|
||
: nsImageRenderer::CONTAIN;
|
||
return nsImageRenderer::ComputeConstrainedSize(aBgPositioningArea,
|
||
aIntrinsicSize.mRatio,
|
||
fitType);
|
||
}
|
||
|
||
// No cover/contain constraint, use default algorithm.
|
||
CSSSizeOrRatio specifiedSize;
|
||
if (aLayerSize.mWidthType == nsStyleBackground::Size::eLengthPercentage) {
|
||
specifiedSize.SetWidth(
|
||
aLayerSize.ResolveWidthLengthPercentage(aBgPositioningArea));
|
||
}
|
||
if (aLayerSize.mHeightType == nsStyleBackground::Size::eLengthPercentage) {
|
||
specifiedSize.SetHeight(
|
||
aLayerSize.ResolveHeightLengthPercentage(aBgPositioningArea));
|
||
}
|
||
|
||
return nsImageRenderer::ComputeConcreteSize(specifiedSize,
|
||
aIntrinsicSize,
|
||
aBgPositioningArea);
|
||
}
|
||
|
||
nsBackgroundLayerState
|
||
nsCSSRendering::PrepareBackgroundLayer(nsPresContext* aPresContext,
|
||
nsIFrame* aForFrame,
|
||
uint32_t aFlags,
|
||
const nsRect& aBorderArea,
|
||
const nsRect& aBGClipRect,
|
||
const nsStyleBackground::Layer& aLayer)
|
||
{
|
||
/*
|
||
* The properties we need to keep in mind when drawing background
|
||
* layers are:
|
||
*
|
||
* background-image
|
||
* background-repeat
|
||
* background-attachment
|
||
* background-position
|
||
* background-clip
|
||
* background-origin
|
||
* background-size
|
||
* background-blend-mode
|
||
* box-decoration-break
|
||
*
|
||
* (background-color applies to the entire element and not to individual
|
||
* layers, so it is irrelevant to this method.)
|
||
*
|
||
* These properties have the following dependencies upon each other when
|
||
* determining rendering:
|
||
*
|
||
* background-image
|
||
* no dependencies
|
||
* background-repeat
|
||
* no dependencies
|
||
* background-attachment
|
||
* no dependencies
|
||
* background-position
|
||
* depends upon background-size (for the image's scaled size) and
|
||
* background-break (for the background positioning area)
|
||
* background-clip
|
||
* no dependencies
|
||
* background-origin
|
||
* depends upon background-attachment (only in the case where that value
|
||
* is 'fixed')
|
||
* background-size
|
||
* depends upon box-decoration-break (for the background positioning area
|
||
* for resolving percentages), background-image (for the image's intrinsic
|
||
* size), background-repeat (if that value is 'round'), and
|
||
* background-origin (for the background painting area, when
|
||
* background-repeat is 'round')
|
||
* box-decoration-break
|
||
* no dependencies
|
||
*
|
||
* As a result of only-if dependencies we don't strictly do a topological
|
||
* sort of the above properties when processing, but it's pretty close to one:
|
||
*
|
||
* background-clip (by caller)
|
||
* background-image
|
||
* box-decoration-break, background-origin
|
||
* background-attachment (postfix for background-origin if 'fixed')
|
||
* background-size
|
||
* background-position
|
||
* background-repeat
|
||
*/
|
||
|
||
uint32_t irFlags = 0;
|
||
if (aFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES) {
|
||
irFlags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
|
||
}
|
||
if (aFlags & nsCSSRendering::PAINTBG_TO_WINDOW) {
|
||
irFlags |= nsImageRenderer::FLAG_PAINTING_TO_WINDOW;
|
||
}
|
||
|
||
nsBackgroundLayerState state(aForFrame, &aLayer.mImage, irFlags);
|
||
if (!state.mImageRenderer.PrepareImage()) {
|
||
// There's no image or it's not ready to be painted.
|
||
return state;
|
||
}
|
||
|
||
// The frame to which the background is attached
|
||
nsIFrame* attachedToFrame = aForFrame;
|
||
// Compute background origin area relative to aBorderArea now as we may need
|
||
// it to compute the effective image size for a CSS gradient.
|
||
nsRect bgPositioningArea =
|
||
ComputeBackgroundPositioningArea(aPresContext, aForFrame, aBorderArea,
|
||
aLayer, &attachedToFrame);
|
||
|
||
// For background-attachment:fixed backgrounds, we'll limit the area
|
||
// where the background can be drawn to the viewport.
|
||
nsRect bgClipRect = aBGClipRect;
|
||
|
||
// Compute the anchor point.
|
||
//
|
||
// relative to aBorderArea.TopLeft() (which is where the top-left
|
||
// of aForFrame's border-box will be rendered)
|
||
nsPoint imageTopLeft;
|
||
if (NS_STYLE_BG_ATTACHMENT_FIXED == aLayer.mAttachment) {
|
||
if ((aFlags & nsCSSRendering::PAINTBG_TO_WINDOW) &&
|
||
!IsTransformed(aForFrame, attachedToFrame)) {
|
||
// Clip background-attachment:fixed backgrounds to the viewport, if we're
|
||
// painting to the screen and not transformed. This avoids triggering
|
||
// tiling in common cases, without affecting output since drawing is
|
||
// always clipped to the viewport when we draw to the screen. (But it's
|
||
// not a pure optimization since it can affect the values of pixels at the
|
||
// edge of the viewport --- whether they're sampled from a putative "next
|
||
// tile" or not.)
|
||
bgClipRect.IntersectRect(bgClipRect, bgPositioningArea + aBorderArea.TopLeft());
|
||
}
|
||
}
|
||
|
||
// Scale the image as specified for background-size and as required for
|
||
// proper background positioning when background-position is defined with
|
||
// percentages.
|
||
CSSSizeOrRatio intrinsicSize = state.mImageRenderer.ComputeIntrinsicSize();
|
||
nsSize bgPositionSize = bgPositioningArea.Size();
|
||
nsSize imageSize = ComputeDrawnSizeForBackground(intrinsicSize,
|
||
bgPositionSize,
|
||
aLayer.mSize);
|
||
if (imageSize.width <= 0 || imageSize.height <= 0)
|
||
return state;
|
||
|
||
state.mImageRenderer.SetPreferredSize(intrinsicSize,
|
||
imageSize);
|
||
|
||
// Compute the position of the background now that the background's size is
|
||
// determined.
|
||
nsImageRenderer::ComputeObjectAnchorPoint(aLayer.mPosition,
|
||
bgPositionSize, imageSize,
|
||
&imageTopLeft, &state.mAnchor);
|
||
imageTopLeft += bgPositioningArea.TopLeft();
|
||
state.mAnchor += bgPositioningArea.TopLeft();
|
||
|
||
state.mDestArea = nsRect(imageTopLeft + aBorderArea.TopLeft(), imageSize);
|
||
state.mFillArea = state.mDestArea;
|
||
int repeatX = aLayer.mRepeat.mXRepeat;
|
||
int repeatY = aLayer.mRepeat.mYRepeat;
|
||
if (repeatX == NS_STYLE_BG_REPEAT_REPEAT) {
|
||
state.mFillArea.x = bgClipRect.x;
|
||
state.mFillArea.width = bgClipRect.width;
|
||
}
|
||
if (repeatY == NS_STYLE_BG_REPEAT_REPEAT) {
|
||
state.mFillArea.y = bgClipRect.y;
|
||
state.mFillArea.height = bgClipRect.height;
|
||
}
|
||
state.mFillArea.IntersectRect(state.mFillArea, bgClipRect);
|
||
|
||
state.mCompositingOp = GetGFXBlendMode(aLayer.mBlendMode);
|
||
|
||
return state;
|
||
}
|
||
|
||
nsRect
|
||
nsCSSRendering::GetBackgroundLayerRect(nsPresContext* aPresContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aBorderArea,
|
||
const nsRect& aClipRect,
|
||
const nsStyleBackground::Layer& aLayer,
|
||
uint32_t aFlags)
|
||
{
|
||
Sides skipSides = aForFrame->GetSkipSides();
|
||
nsRect borderArea =
|
||
::BoxDecorationRectForBackground(aForFrame, aBorderArea, skipSides);
|
||
nsBackgroundLayerState state =
|
||
PrepareBackgroundLayer(aPresContext, aForFrame, aFlags, borderArea,
|
||
aClipRect, aLayer);
|
||
return state.mFillArea;
|
||
}
|
||
|
||
/* static */ bool
|
||
nsCSSRendering::IsBackgroundImageDecodedForStyleContextAndLayer(
|
||
const nsStyleBackground *aBackground, uint32_t aLayer)
|
||
{
|
||
const nsStyleImage* image = &aBackground->mLayers[aLayer].mImage;
|
||
if (image->GetType() == eStyleImageType_Image) {
|
||
nsCOMPtr<imgIContainer> img;
|
||
if (NS_SUCCEEDED(image->GetImageData()->GetImage(getter_AddRefs(img)))) {
|
||
if (!img->IsDecoded()) {
|
||
return false;
|
||
}
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
/* static */ bool
|
||
nsCSSRendering::AreAllBackgroundImagesDecodedForFrame(nsIFrame* aFrame)
|
||
{
|
||
const nsStyleBackground *bg = aFrame->StyleContext()->StyleBackground();
|
||
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
|
||
if (!IsBackgroundImageDecodedForStyleContextAndLayer(bg, i)) {
|
||
return false;
|
||
}
|
||
}
|
||
return true;
|
||
}
|
||
|
||
static void
|
||
DrawBorderImage(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
nsIFrame* aForFrame,
|
||
const nsRect& aBorderArea,
|
||
const nsStyleBorder& aStyleBorder,
|
||
const nsRect& aDirtyRect,
|
||
Sides aSkipSides)
|
||
{
|
||
NS_PRECONDITION(aStyleBorder.IsBorderImageLoaded(),
|
||
"drawing border image that isn't successfully loaded");
|
||
|
||
if (aDirtyRect.IsEmpty())
|
||
return;
|
||
|
||
nsImageRenderer renderer(aForFrame, &aStyleBorder.mBorderImageSource, 0);
|
||
|
||
// Ensure we get invalidated for loads and animations of the image.
|
||
// We need to do this here because this might be the only code that
|
||
// knows about the association of the style data with the frame.
|
||
// XXX We shouldn't really... since if anybody is passing in a
|
||
// different style, they'll potentially have the wrong size for the
|
||
// border too.
|
||
aForFrame->AssociateImage(aStyleBorder.mBorderImageSource, aPresContext);
|
||
|
||
if (!renderer.PrepareImage()) {
|
||
return;
|
||
}
|
||
|
||
// NOTE: no Save() yet, we do that later by calling autoSR.EnsureSaved()
|
||
// in case we need it.
|
||
gfxContextAutoSaveRestore autoSR;
|
||
|
||
// Determine the border image area, which by default corresponds to the
|
||
// border box but can be modified by 'border-image-outset'.
|
||
// Note that 'border-radius' do not apply to 'border-image' borders per
|
||
// <http://dev.w3.org/csswg/css-backgrounds/#corner-clipping>.
|
||
nsRect borderImgArea;
|
||
nsMargin borderWidths(aStyleBorder.GetComputedBorder());
|
||
nsMargin imageOutset(aStyleBorder.GetImageOutset());
|
||
if (::IsBoxDecorationSlice(aStyleBorder) && !aSkipSides.IsEmpty()) {
|
||
borderImgArea = ::BoxDecorationRectForBorder(aForFrame, aBorderArea,
|
||
aSkipSides, &aStyleBorder);
|
||
if (borderImgArea.IsEqualEdges(aBorderArea)) {
|
||
// No need for a clip, just skip the sides we don't want.
|
||
borderWidths.ApplySkipSides(aSkipSides);
|
||
imageOutset.ApplySkipSides(aSkipSides);
|
||
borderImgArea.Inflate(imageOutset);
|
||
} else {
|
||
// We're drawing borders around the joined continuation boxes so we need
|
||
// to clip that to the slice that we want for this frame.
|
||
borderImgArea.Inflate(imageOutset);
|
||
imageOutset.ApplySkipSides(aSkipSides);
|
||
nsRect clip = aBorderArea;
|
||
clip.Inflate(imageOutset);
|
||
autoSR.EnsureSaved(aRenderingContext.ThebesContext());
|
||
aRenderingContext.ThebesContext()->
|
||
Clip(NSRectToSnappedRect(clip,
|
||
aForFrame->PresContext()->AppUnitsPerDevPixel(),
|
||
*aRenderingContext.GetDrawTarget()));
|
||
}
|
||
} else {
|
||
borderImgArea = aBorderArea;
|
||
borderImgArea.Inflate(imageOutset);
|
||
}
|
||
|
||
// Calculate the image size used to compute slice points.
|
||
CSSSizeOrRatio intrinsicSize = renderer.ComputeIntrinsicSize();
|
||
nsSize imageSize = nsImageRenderer::ComputeConcreteSize(CSSSizeOrRatio(),
|
||
intrinsicSize,
|
||
borderImgArea.Size());
|
||
renderer.SetPreferredSize(intrinsicSize, imageSize);
|
||
|
||
// Compute the used values of 'border-image-slice' and 'border-image-width';
|
||
// we do them together because the latter can depend on the former.
|
||
nsMargin slice;
|
||
nsMargin border;
|
||
NS_FOR_CSS_SIDES(s) {
|
||
nsStyleCoord coord = aStyleBorder.mBorderImageSlice.Get(s);
|
||
int32_t imgDimension = NS_SIDE_IS_VERTICAL(s)
|
||
? imageSize.width : imageSize.height;
|
||
nscoord borderDimension = NS_SIDE_IS_VERTICAL(s)
|
||
? borderImgArea.width : borderImgArea.height;
|
||
double value;
|
||
switch (coord.GetUnit()) {
|
||
case eStyleUnit_Percent:
|
||
value = coord.GetPercentValue() * imgDimension;
|
||
break;
|
||
case eStyleUnit_Factor:
|
||
value = nsPresContext::CSSPixelsToAppUnits(
|
||
NS_lround(coord.GetFactorValue()));
|
||
break;
|
||
default:
|
||
NS_NOTREACHED("unexpected CSS unit for image slice");
|
||
value = 0;
|
||
break;
|
||
}
|
||
if (value < 0)
|
||
value = 0;
|
||
if (value > imgDimension)
|
||
value = imgDimension;
|
||
slice.Side(s) = value;
|
||
|
||
coord = aStyleBorder.mBorderImageWidth.Get(s);
|
||
switch (coord.GetUnit()) {
|
||
case eStyleUnit_Coord: // absolute dimension
|
||
value = coord.GetCoordValue();
|
||
break;
|
||
case eStyleUnit_Percent:
|
||
value = coord.GetPercentValue() * borderDimension;
|
||
break;
|
||
case eStyleUnit_Factor:
|
||
value = coord.GetFactorValue() * borderWidths.Side(s);
|
||
break;
|
||
case eStyleUnit_Auto: // same as the slice value, in CSS pixels
|
||
value = slice.Side(s);
|
||
break;
|
||
default:
|
||
NS_NOTREACHED("unexpected CSS unit for border image area division");
|
||
value = 0;
|
||
break;
|
||
}
|
||
// NSToCoordRoundWithClamp rounds towards infinity, but that's OK
|
||
// because we expect value to be non-negative.
|
||
MOZ_ASSERT(value >= 0);
|
||
border.Side(s) = NSToCoordRoundWithClamp(value);
|
||
MOZ_ASSERT(border.Side(s) >= 0);
|
||
}
|
||
|
||
// "If two opposite border-image-width offsets are large enough that they
|
||
// overlap, their used values are proportionately reduced until they no
|
||
// longer overlap."
|
||
uint32_t combinedBorderWidth = uint32_t(border.left) +
|
||
uint32_t(border.right);
|
||
double scaleX = combinedBorderWidth > uint32_t(borderImgArea.width)
|
||
? borderImgArea.width / double(combinedBorderWidth)
|
||
: 1.0;
|
||
uint32_t combinedBorderHeight = uint32_t(border.top) +
|
||
uint32_t(border.bottom);
|
||
double scaleY = combinedBorderHeight > uint32_t(borderImgArea.height)
|
||
? borderImgArea.height / double(combinedBorderHeight)
|
||
: 1.0;
|
||
double scale = std::min(scaleX, scaleY);
|
||
if (scale < 1.0) {
|
||
border.left *= scale;
|
||
border.right *= scale;
|
||
border.top *= scale;
|
||
border.bottom *= scale;
|
||
NS_ASSERTION(border.left + border.right <= borderImgArea.width &&
|
||
border.top + border.bottom <= borderImgArea.height,
|
||
"rounding error in width reduction???");
|
||
}
|
||
|
||
// These helper tables recharacterize the 'slice' and 'width' margins
|
||
// in a more convenient form: they are the x/y/width/height coords
|
||
// required for various bands of the border, and they have been transformed
|
||
// to be relative to the innerRect (for 'slice') or the page (for 'border').
|
||
enum {
|
||
LEFT, MIDDLE, RIGHT,
|
||
TOP = LEFT, BOTTOM = RIGHT
|
||
};
|
||
const nscoord borderX[3] = {
|
||
borderImgArea.x + 0,
|
||
borderImgArea.x + border.left,
|
||
borderImgArea.x + borderImgArea.width - border.right,
|
||
};
|
||
const nscoord borderY[3] = {
|
||
borderImgArea.y + 0,
|
||
borderImgArea.y + border.top,
|
||
borderImgArea.y + borderImgArea.height - border.bottom,
|
||
};
|
||
const nscoord borderWidth[3] = {
|
||
border.left,
|
||
borderImgArea.width - border.left - border.right,
|
||
border.right,
|
||
};
|
||
const nscoord borderHeight[3] = {
|
||
border.top,
|
||
borderImgArea.height - border.top - border.bottom,
|
||
border.bottom,
|
||
};
|
||
const int32_t sliceX[3] = {
|
||
0,
|
||
slice.left,
|
||
imageSize.width - slice.right,
|
||
};
|
||
const int32_t sliceY[3] = {
|
||
0,
|
||
slice.top,
|
||
imageSize.height - slice.bottom,
|
||
};
|
||
const int32_t sliceWidth[3] = {
|
||
slice.left,
|
||
std::max(imageSize.width - slice.left - slice.right, 0),
|
||
slice.right,
|
||
};
|
||
const int32_t sliceHeight[3] = {
|
||
slice.top,
|
||
std::max(imageSize.height - slice.top - slice.bottom, 0),
|
||
slice.bottom,
|
||
};
|
||
|
||
for (int i = LEFT; i <= RIGHT; i++) {
|
||
for (int j = TOP; j <= BOTTOM; j++) {
|
||
uint8_t fillStyleH, fillStyleV;
|
||
nsSize unitSize;
|
||
|
||
if (i == MIDDLE && j == MIDDLE) {
|
||
// Discard the middle portion unless set to fill.
|
||
if (NS_STYLE_BORDER_IMAGE_SLICE_NOFILL ==
|
||
aStyleBorder.mBorderImageFill) {
|
||
continue;
|
||
}
|
||
|
||
NS_ASSERTION(NS_STYLE_BORDER_IMAGE_SLICE_FILL ==
|
||
aStyleBorder.mBorderImageFill,
|
||
"Unexpected border image fill");
|
||
|
||
// css-background:
|
||
// The middle image's width is scaled by the same factor as the
|
||
// top image unless that factor is zero or infinity, in which
|
||
// case the scaling factor of the bottom is substituted, and
|
||
// failing that, the width is not scaled. The height of the
|
||
// middle image is scaled by the same factor as the left image
|
||
// unless that factor is zero or infinity, in which case the
|
||
// scaling factor of the right image is substituted, and failing
|
||
// that, the height is not scaled.
|
||
gfxFloat hFactor, vFactor;
|
||
|
||
if (0 < border.left && 0 < slice.left)
|
||
vFactor = gfxFloat(border.left)/slice.left;
|
||
else if (0 < border.right && 0 < slice.right)
|
||
vFactor = gfxFloat(border.right)/slice.right;
|
||
else
|
||
vFactor = 1;
|
||
|
||
if (0 < border.top && 0 < slice.top)
|
||
hFactor = gfxFloat(border.top)/slice.top;
|
||
else if (0 < border.bottom && 0 < slice.bottom)
|
||
hFactor = gfxFloat(border.bottom)/slice.bottom;
|
||
else
|
||
hFactor = 1;
|
||
|
||
unitSize.width = sliceWidth[i]*hFactor;
|
||
unitSize.height = sliceHeight[j]*vFactor;
|
||
fillStyleH = aStyleBorder.mBorderImageRepeatH;
|
||
fillStyleV = aStyleBorder.mBorderImageRepeatV;
|
||
|
||
} else if (i == MIDDLE) { // top, bottom
|
||
// Sides are always stretched to the thickness of their border,
|
||
// and stretched proportionately on the other axis.
|
||
gfxFloat factor;
|
||
if (0 < borderHeight[j] && 0 < sliceHeight[j])
|
||
factor = gfxFloat(borderHeight[j])/sliceHeight[j];
|
||
else
|
||
factor = 1;
|
||
|
||
unitSize.width = sliceWidth[i]*factor;
|
||
unitSize.height = borderHeight[j];
|
||
fillStyleH = aStyleBorder.mBorderImageRepeatH;
|
||
fillStyleV = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
|
||
|
||
} else if (j == MIDDLE) { // left, right
|
||
gfxFloat factor;
|
||
if (0 < borderWidth[i] && 0 < sliceWidth[i])
|
||
factor = gfxFloat(borderWidth[i])/sliceWidth[i];
|
||
else
|
||
factor = 1;
|
||
|
||
unitSize.width = borderWidth[i];
|
||
unitSize.height = sliceHeight[j]*factor;
|
||
fillStyleH = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
|
||
fillStyleV = aStyleBorder.mBorderImageRepeatV;
|
||
|
||
} else {
|
||
// Corners are always stretched to fit the corner.
|
||
unitSize.width = borderWidth[i];
|
||
unitSize.height = borderHeight[j];
|
||
fillStyleH = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
|
||
fillStyleV = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
|
||
}
|
||
|
||
nsRect destArea(borderX[i], borderY[j], borderWidth[i], borderHeight[j]);
|
||
nsRect subArea(sliceX[i], sliceY[j], sliceWidth[i], sliceHeight[j]);
|
||
nsIntRect intSubArea = subArea.ToOutsidePixels(nsPresContext::AppUnitsPerCSSPixel());
|
||
|
||
renderer.DrawBorderImageComponent(aPresContext,
|
||
aRenderingContext, aDirtyRect,
|
||
destArea, CSSIntRect(intSubArea.x,
|
||
intSubArea.y,
|
||
intSubArea.width,
|
||
intSubArea.height),
|
||
fillStyleH, fillStyleV,
|
||
unitSize, j * (RIGHT + 1) + i);
|
||
}
|
||
}
|
||
}
|
||
|
||
// Begin table border-collapsing section
|
||
// These functions were written to not disrupt the normal ones and yet satisfy some additional requirements
|
||
// At some point, all functions should be unified to include the additional functionality that these provide
|
||
|
||
static nscoord
|
||
RoundIntToPixel(nscoord aValue,
|
||
nscoord aTwipsPerPixel,
|
||
bool aRoundDown = false)
|
||
{
|
||
if (aTwipsPerPixel <= 0)
|
||
// We must be rendering to a device that has a resolution greater than Twips!
|
||
// In that case, aValue is as accurate as it's going to get.
|
||
return aValue;
|
||
|
||
nscoord halfPixel = NSToCoordRound(aTwipsPerPixel / 2.0f);
|
||
nscoord extra = aValue % aTwipsPerPixel;
|
||
nscoord finalValue = (!aRoundDown && (extra >= halfPixel)) ? aValue + (aTwipsPerPixel - extra) : aValue - extra;
|
||
return finalValue;
|
||
}
|
||
|
||
static nscoord
|
||
RoundFloatToPixel(float aValue,
|
||
nscoord aTwipsPerPixel,
|
||
bool aRoundDown = false)
|
||
{
|
||
return RoundIntToPixel(NSToCoordRound(aValue), aTwipsPerPixel, aRoundDown);
|
||
}
|
||
|
||
static void SetPoly(const Rect& aRect, Point* poly)
|
||
{
|
||
poly[0].x = aRect.x;
|
||
poly[0].y = aRect.y;
|
||
poly[1].x = aRect.x + aRect.width;
|
||
poly[1].y = aRect.y;
|
||
poly[2].x = aRect.x + aRect.width;
|
||
poly[2].y = aRect.y + aRect.height;
|
||
poly[3].x = aRect.x;
|
||
poly[3].y = aRect.y + aRect.height;
|
||
}
|
||
|
||
static void
|
||
DrawSolidBorderSegment(nsRenderingContext& aContext,
|
||
nsRect aRect,
|
||
nscolor aColor,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
nscoord aTwipsPerPixel,
|
||
uint8_t aStartBevelSide = 0,
|
||
nscoord aStartBevelOffset = 0,
|
||
uint8_t aEndBevelSide = 0,
|
||
nscoord aEndBevelOffset = 0)
|
||
{
|
||
DrawTarget* drawTarget = aContext.GetDrawTarget();
|
||
|
||
ColorPattern color(ToDeviceColor(aColor));
|
||
DrawOptions drawOptions(1.f, CompositionOp::OP_OVER, AntialiasMode::NONE);
|
||
|
||
if ((aRect.width == aTwipsPerPixel) || (aRect.height == aTwipsPerPixel) ||
|
||
((0 == aStartBevelOffset) && (0 == aEndBevelOffset))) {
|
||
// simple line or rectangle
|
||
if ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide)) {
|
||
if (1 == aRect.height)
|
||
StrokeLineWithSnapping(aRect.TopLeft(), aRect.BottomLeft(),
|
||
aAppUnitsPerDevPixel, *drawTarget,
|
||
color, StrokeOptions(), drawOptions);
|
||
else
|
||
drawTarget->FillRect(NSRectToSnappedRect(aRect, aAppUnitsPerDevPixel,
|
||
*drawTarget),
|
||
color, drawOptions);
|
||
}
|
||
else {
|
||
if (1 == aRect.width)
|
||
StrokeLineWithSnapping(aRect.TopLeft(), aRect.TopRight(),
|
||
aAppUnitsPerDevPixel, *drawTarget,
|
||
color, StrokeOptions(), drawOptions);
|
||
else
|
||
drawTarget->FillRect(NSRectToSnappedRect(aRect, aAppUnitsPerDevPixel,
|
||
*drawTarget),
|
||
color, drawOptions);
|
||
}
|
||
}
|
||
else {
|
||
// polygon with beveling
|
||
Point poly[4];
|
||
SetPoly(NSRectToSnappedRect(aRect, aAppUnitsPerDevPixel, *drawTarget),
|
||
poly);
|
||
|
||
Float startBevelOffset =
|
||
NSAppUnitsToFloatPixels(aStartBevelOffset, aAppUnitsPerDevPixel);
|
||
switch(aStartBevelSide) {
|
||
case NS_SIDE_TOP:
|
||
poly[0].x += startBevelOffset;
|
||
break;
|
||
case NS_SIDE_BOTTOM:
|
||
poly[3].x += startBevelOffset;
|
||
break;
|
||
case NS_SIDE_RIGHT:
|
||
poly[1].y += startBevelOffset;
|
||
break;
|
||
case NS_SIDE_LEFT:
|
||
poly[0].y += startBevelOffset;
|
||
}
|
||
|
||
Float endBevelOffset =
|
||
NSAppUnitsToFloatPixels(aEndBevelOffset, aAppUnitsPerDevPixel);
|
||
switch(aEndBevelSide) {
|
||
case NS_SIDE_TOP:
|
||
poly[1].x -= endBevelOffset;
|
||
break;
|
||
case NS_SIDE_BOTTOM:
|
||
poly[2].x -= endBevelOffset;
|
||
break;
|
||
case NS_SIDE_RIGHT:
|
||
poly[2].y -= endBevelOffset;
|
||
break;
|
||
case NS_SIDE_LEFT:
|
||
poly[3].y -= endBevelOffset;
|
||
}
|
||
|
||
RefPtr<PathBuilder> builder = drawTarget->CreatePathBuilder();
|
||
builder->MoveTo(poly[0]);
|
||
builder->LineTo(poly[1]);
|
||
builder->LineTo(poly[2]);
|
||
builder->LineTo(poly[3]);
|
||
builder->Close();
|
||
RefPtr<Path> path = builder->Finish();
|
||
drawTarget->Fill(path, color, drawOptions);
|
||
}
|
||
}
|
||
|
||
static void
|
||
GetDashInfo(nscoord aBorderLength,
|
||
nscoord aDashLength,
|
||
nscoord aTwipsPerPixel,
|
||
int32_t& aNumDashSpaces,
|
||
nscoord& aStartDashLength,
|
||
nscoord& aEndDashLength)
|
||
{
|
||
aNumDashSpaces = 0;
|
||
if (aStartDashLength + aDashLength + aEndDashLength >= aBorderLength) {
|
||
aStartDashLength = aBorderLength;
|
||
aEndDashLength = 0;
|
||
}
|
||
else {
|
||
aNumDashSpaces = (aBorderLength - aDashLength)/ (2 * aDashLength); // round down
|
||
nscoord extra = aBorderLength - aStartDashLength - aEndDashLength - (((2 * aNumDashSpaces) - 1) * aDashLength);
|
||
if (extra > 0) {
|
||
nscoord half = RoundIntToPixel(extra / 2, aTwipsPerPixel);
|
||
aStartDashLength += half;
|
||
aEndDashLength += (extra - half);
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::DrawTableBorderSegment(nsRenderingContext& aContext,
|
||
uint8_t aBorderStyle,
|
||
nscolor aBorderColor,
|
||
const nsStyleBackground* aBGColor,
|
||
const nsRect& aBorder,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
int32_t aAppUnitsPerCSSPixel,
|
||
uint8_t aStartBevelSide,
|
||
nscoord aStartBevelOffset,
|
||
uint8_t aEndBevelSide,
|
||
nscoord aEndBevelOffset)
|
||
{
|
||
bool horizontal = ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide));
|
||
nscoord twipsPerPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerCSSPixel);
|
||
uint8_t ridgeGroove = NS_STYLE_BORDER_STYLE_RIDGE;
|
||
|
||
if ((twipsPerPixel >= aBorder.width) || (twipsPerPixel >= aBorder.height) ||
|
||
(NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) || (NS_STYLE_BORDER_STYLE_DOTTED == aBorderStyle)) {
|
||
// no beveling for 1 pixel border, dash or dot
|
||
aStartBevelOffset = 0;
|
||
aEndBevelOffset = 0;
|
||
}
|
||
|
||
gfxContext *ctx = aContext.ThebesContext();
|
||
AntialiasMode oldMode = ctx->CurrentAntialiasMode();
|
||
ctx->SetAntialiasMode(AntialiasMode::NONE);
|
||
|
||
ctx->SetColor(aBorderColor);
|
||
|
||
switch (aBorderStyle) {
|
||
case NS_STYLE_BORDER_STYLE_NONE:
|
||
case NS_STYLE_BORDER_STYLE_HIDDEN:
|
||
//NS_ASSERTION(false, "style of none or hidden");
|
||
break;
|
||
case NS_STYLE_BORDER_STYLE_DOTTED:
|
||
case NS_STYLE_BORDER_STYLE_DASHED:
|
||
{
|
||
nscoord dashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) ? DASH_LENGTH : DOT_LENGTH;
|
||
// make the dash length proportional to the border thickness
|
||
dashLength *= (horizontal) ? aBorder.height : aBorder.width;
|
||
// make the min dash length for the ends 1/2 the dash length
|
||
nscoord minDashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle)
|
||
? RoundFloatToPixel(((float)dashLength) / 2.0f, twipsPerPixel) : dashLength;
|
||
minDashLength = std::max(minDashLength, twipsPerPixel);
|
||
nscoord numDashSpaces = 0;
|
||
nscoord startDashLength = minDashLength;
|
||
nscoord endDashLength = minDashLength;
|
||
if (horizontal) {
|
||
GetDashInfo(aBorder.width, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
|
||
nsRect rect(aBorder.x, aBorder.y, startDashLength, aBorder.height);
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel);
|
||
for (int32_t spaceX = 0; spaceX < numDashSpaces; spaceX++) {
|
||
rect.x += rect.width + dashLength;
|
||
rect.width = (spaceX == (numDashSpaces - 1)) ? endDashLength : dashLength;
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel);
|
||
}
|
||
}
|
||
else {
|
||
GetDashInfo(aBorder.height, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
|
||
nsRect rect(aBorder.x, aBorder.y, aBorder.width, startDashLength);
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel);
|
||
for (int32_t spaceY = 0; spaceY < numDashSpaces; spaceY++) {
|
||
rect.y += rect.height + dashLength;
|
||
rect.height = (spaceY == (numDashSpaces - 1)) ? endDashLength : dashLength;
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel);
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
case NS_STYLE_BORDER_STYLE_GROOVE:
|
||
ridgeGroove = NS_STYLE_BORDER_STYLE_GROOVE; // and fall through to ridge
|
||
case NS_STYLE_BORDER_STYLE_RIDGE:
|
||
if ((horizontal && (twipsPerPixel >= aBorder.height)) ||
|
||
(!horizontal && (twipsPerPixel >= aBorder.width))) {
|
||
// a one pixel border
|
||
DrawSolidBorderSegment(aContext, aBorder, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel,
|
||
aStartBevelSide, aStartBevelOffset,
|
||
aEndBevelSide, aEndBevelOffset);
|
||
}
|
||
else {
|
||
nscoord startBevel = (aStartBevelOffset > 0)
|
||
? RoundFloatToPixel(0.5f * (float)aStartBevelOffset, twipsPerPixel, true) : 0;
|
||
nscoord endBevel = (aEndBevelOffset > 0)
|
||
? RoundFloatToPixel(0.5f * (float)aEndBevelOffset, twipsPerPixel, true) : 0;
|
||
mozilla::css::Side ridgeGrooveSide = (horizontal) ? NS_SIDE_TOP : NS_SIDE_LEFT;
|
||
// FIXME: In theory, this should use the visited-dependent
|
||
// background color, but I don't care.
|
||
ctx->SetColor(
|
||
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
|
||
nsRect rect(aBorder);
|
||
nscoord half;
|
||
if (horizontal) { // top, bottom
|
||
half = RoundFloatToPixel(0.5f * (float)aBorder.height, twipsPerPixel);
|
||
rect.height = half;
|
||
if (NS_SIDE_TOP == aStartBevelSide) {
|
||
rect.x += startBevel;
|
||
rect.width -= startBevel;
|
||
}
|
||
if (NS_SIDE_TOP == aEndBevelSide) {
|
||
rect.width -= endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
else { // left, right
|
||
half = RoundFloatToPixel(0.5f * (float)aBorder.width, twipsPerPixel);
|
||
rect.width = half;
|
||
if (NS_SIDE_LEFT == aStartBevelSide) {
|
||
rect.y += startBevel;
|
||
rect.height -= startBevel;
|
||
}
|
||
if (NS_SIDE_LEFT == aEndBevelSide) {
|
||
rect.height -= endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
|
||
rect = aBorder;
|
||
ridgeGrooveSide = (NS_SIDE_TOP == ridgeGrooveSide) ? NS_SIDE_BOTTOM : NS_SIDE_RIGHT;
|
||
// FIXME: In theory, this should use the visited-dependent
|
||
// background color, but I don't care.
|
||
ctx->SetColor(
|
||
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
|
||
if (horizontal) {
|
||
rect.y = rect.y + half;
|
||
rect.height = aBorder.height - half;
|
||
if (NS_SIDE_BOTTOM == aStartBevelSide) {
|
||
rect.x += startBevel;
|
||
rect.width -= startBevel;
|
||
}
|
||
if (NS_SIDE_BOTTOM == aEndBevelSide) {
|
||
rect.width -= endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
else {
|
||
rect.x = rect.x + half;
|
||
rect.width = aBorder.width - half;
|
||
if (NS_SIDE_RIGHT == aStartBevelSide) {
|
||
rect.y += aStartBevelOffset - startBevel;
|
||
rect.height -= startBevel;
|
||
}
|
||
if (NS_SIDE_RIGHT == aEndBevelSide) {
|
||
rect.height -= endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, rect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
}
|
||
break;
|
||
case NS_STYLE_BORDER_STYLE_DOUBLE:
|
||
// We can only do "double" borders if the thickness of the border
|
||
// is more than 2px. Otherwise, we fall through to painting a
|
||
// solid border.
|
||
if ((aBorder.width > 2*twipsPerPixel || horizontal) &&
|
||
(aBorder.height > 2*twipsPerPixel || !horizontal)) {
|
||
nscoord startBevel = (aStartBevelOffset > 0)
|
||
? RoundFloatToPixel(0.333333f * (float)aStartBevelOffset, twipsPerPixel) : 0;
|
||
nscoord endBevel = (aEndBevelOffset > 0)
|
||
? RoundFloatToPixel(0.333333f * (float)aEndBevelOffset, twipsPerPixel) : 0;
|
||
if (horizontal) { // top, bottom
|
||
nscoord thirdHeight = RoundFloatToPixel(0.333333f * (float)aBorder.height, twipsPerPixel);
|
||
|
||
// draw the top line or rect
|
||
nsRect topRect(aBorder.x, aBorder.y, aBorder.width, thirdHeight);
|
||
if (NS_SIDE_TOP == aStartBevelSide) {
|
||
topRect.x += aStartBevelOffset - startBevel;
|
||
topRect.width -= aStartBevelOffset - startBevel;
|
||
}
|
||
if (NS_SIDE_TOP == aEndBevelSide) {
|
||
topRect.width -= aEndBevelOffset - endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, topRect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
|
||
// draw the botom line or rect
|
||
nscoord heightOffset = aBorder.height - thirdHeight;
|
||
nsRect bottomRect(aBorder.x, aBorder.y + heightOffset, aBorder.width, aBorder.height - heightOffset);
|
||
if (NS_SIDE_BOTTOM == aStartBevelSide) {
|
||
bottomRect.x += aStartBevelOffset - startBevel;
|
||
bottomRect.width -= aStartBevelOffset - startBevel;
|
||
}
|
||
if (NS_SIDE_BOTTOM == aEndBevelSide) {
|
||
bottomRect.width -= aEndBevelOffset - endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, bottomRect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
else { // left, right
|
||
nscoord thirdWidth = RoundFloatToPixel(0.333333f * (float)aBorder.width, twipsPerPixel);
|
||
|
||
nsRect leftRect(aBorder.x, aBorder.y, thirdWidth, aBorder.height);
|
||
if (NS_SIDE_LEFT == aStartBevelSide) {
|
||
leftRect.y += aStartBevelOffset - startBevel;
|
||
leftRect.height -= aStartBevelOffset - startBevel;
|
||
}
|
||
if (NS_SIDE_LEFT == aEndBevelSide) {
|
||
leftRect.height -= aEndBevelOffset - endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, leftRect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
|
||
nscoord widthOffset = aBorder.width - thirdWidth;
|
||
nsRect rightRect(aBorder.x + widthOffset, aBorder.y, aBorder.width - widthOffset, aBorder.height);
|
||
if (NS_SIDE_RIGHT == aStartBevelSide) {
|
||
rightRect.y += aStartBevelOffset - startBevel;
|
||
rightRect.height -= aStartBevelOffset - startBevel;
|
||
}
|
||
if (NS_SIDE_RIGHT == aEndBevelSide) {
|
||
rightRect.height -= aEndBevelOffset - endBevel;
|
||
}
|
||
DrawSolidBorderSegment(aContext, rightRect, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
startBevel, aEndBevelSide, endBevel);
|
||
}
|
||
break;
|
||
}
|
||
// else fall through to solid
|
||
case NS_STYLE_BORDER_STYLE_SOLID:
|
||
DrawSolidBorderSegment(aContext, aBorder, aBorderColor, aAppUnitsPerDevPixel, twipsPerPixel, aStartBevelSide,
|
||
aStartBevelOffset, aEndBevelSide, aEndBevelOffset);
|
||
break;
|
||
case NS_STYLE_BORDER_STYLE_OUTSET:
|
||
case NS_STYLE_BORDER_STYLE_INSET:
|
||
NS_ASSERTION(false, "inset, outset should have been converted to groove, ridge");
|
||
break;
|
||
case NS_STYLE_BORDER_STYLE_AUTO:
|
||
NS_ASSERTION(false, "Unexpected 'auto' table border");
|
||
break;
|
||
}
|
||
|
||
ctx->SetAntialiasMode(oldMode);
|
||
}
|
||
|
||
// End table border-collapsing section
|
||
|
||
Rect
|
||
nsCSSRendering::ExpandPaintingRectForDecorationLine(
|
||
nsIFrame* aFrame,
|
||
const uint8_t aStyle,
|
||
const Rect& aClippedRect,
|
||
const Float aICoordInFrame,
|
||
const Float aCycleLength,
|
||
bool aVertical)
|
||
{
|
||
switch (aStyle) {
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED:
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
|
||
break;
|
||
default:
|
||
NS_ERROR("Invalid style was specified");
|
||
return aClippedRect;
|
||
}
|
||
|
||
nsBlockFrame* block = nullptr;
|
||
// Note that when we paint the decoration lines in relative positioned
|
||
// box, we should paint them like all of the boxes are positioned as static.
|
||
nscoord framePosInBlockAppUnits = 0;
|
||
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
|
||
block = do_QueryFrame(f);
|
||
if (block) {
|
||
break;
|
||
}
|
||
framePosInBlockAppUnits += aVertical ?
|
||
f->GetNormalPosition().y : f->GetNormalPosition().x;
|
||
}
|
||
|
||
NS_ENSURE_TRUE(block, aClippedRect);
|
||
|
||
nsPresContext *pc = aFrame->PresContext();
|
||
Float framePosInBlock = Float(pc->AppUnitsToGfxUnits(framePosInBlockAppUnits));
|
||
int32_t rectPosInBlock =
|
||
int32_t(NS_round(framePosInBlock + aICoordInFrame));
|
||
int32_t extraStartEdge =
|
||
rectPosInBlock - (rectPosInBlock / int32_t(aCycleLength) * aCycleLength);
|
||
Rect rect(aClippedRect);
|
||
if (aVertical) {
|
||
rect.y -= extraStartEdge;
|
||
rect.height += extraStartEdge;
|
||
} else {
|
||
rect.x -= extraStartEdge;
|
||
rect.width += extraStartEdge;
|
||
}
|
||
return rect;
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::PaintDecorationLine(nsIFrame* aFrame,
|
||
DrawTarget& aDrawTarget,
|
||
const Rect& aDirtyRect,
|
||
const nscolor aColor,
|
||
const gfxPoint& aPt,
|
||
const Float aICoordInFrame,
|
||
const gfxSize& aLineSize,
|
||
const gfxFloat aAscent,
|
||
const gfxFloat aOffset,
|
||
const uint8_t aDecoration,
|
||
const uint8_t aStyle,
|
||
bool aVertical,
|
||
const gfxFloat aDescentLimit)
|
||
{
|
||
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
|
||
|
||
Rect rect = ToRect(
|
||
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
|
||
aDecoration, aStyle, aVertical,
|
||
aDescentLimit));
|
||
if (rect.IsEmpty() || !rect.Intersects(aDirtyRect)) {
|
||
return;
|
||
}
|
||
|
||
if (aDecoration != NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE &&
|
||
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_OVERLINE &&
|
||
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH) {
|
||
NS_ERROR("Invalid decoration value!");
|
||
return;
|
||
}
|
||
|
||
Float lineThickness = std::max(NS_round(aLineSize.height), 1.0);
|
||
|
||
ColorPattern color(ToDeviceColor(aColor));
|
||
StrokeOptions strokeOptions(lineThickness);
|
||
DrawOptions drawOptions;
|
||
|
||
Float dash[2];
|
||
|
||
AutoPopClips autoPopClips(&aDrawTarget);
|
||
|
||
switch (aStyle) {
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE:
|
||
break;
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED: {
|
||
autoPopClips.PushClipRect(rect);
|
||
Float dashWidth = lineThickness * DOT_LENGTH * DASH_LENGTH;
|
||
dash[0] = dashWidth;
|
||
dash[1] = dashWidth;
|
||
strokeOptions.mDashPattern = dash;
|
||
strokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
|
||
strokeOptions.mLineCap = CapStyle::BUTT;
|
||
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
|
||
aICoordInFrame,
|
||
dashWidth * 2,
|
||
aVertical);
|
||
// We should continue to draw the last dash even if it is not in the rect.
|
||
rect.width += dashWidth;
|
||
break;
|
||
}
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED: {
|
||
autoPopClips.PushClipRect(rect);
|
||
Float dashWidth = lineThickness * DOT_LENGTH;
|
||
if (lineThickness > 2.0) {
|
||
dash[0] = 0.f;
|
||
dash[1] = dashWidth * 2.f;
|
||
strokeOptions.mLineCap = CapStyle::ROUND;
|
||
} else {
|
||
dash[0] = dashWidth;
|
||
dash[1] = dashWidth;
|
||
}
|
||
strokeOptions.mDashPattern = dash;
|
||
strokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
|
||
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
|
||
aICoordInFrame,
|
||
dashWidth * 2,
|
||
aVertical);
|
||
// We should continue to draw the last dot even if it is not in the rect.
|
||
rect.width += dashWidth;
|
||
break;
|
||
}
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
|
||
autoPopClips.PushClipRect(rect);
|
||
if (lineThickness > 2.0) {
|
||
drawOptions.mAntialiasMode = AntialiasMode::SUBPIXEL;
|
||
} else {
|
||
// Don't use anti-aliasing here. Because looks like lighter color wavy
|
||
// line at this case. And probably, users don't think the
|
||
// non-anti-aliased wavy line is not pretty.
|
||
drawOptions.mAntialiasMode = AntialiasMode::NONE;
|
||
}
|
||
break;
|
||
default:
|
||
NS_ERROR("Invalid style value!");
|
||
return;
|
||
}
|
||
|
||
// The block-direction position should be set to the middle of the line.
|
||
if (aVertical) {
|
||
rect.x -= lineThickness / 2;
|
||
} else {
|
||
rect.y += lineThickness / 2;
|
||
}
|
||
|
||
switch (aStyle) {
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED: {
|
||
Point p1 = rect.TopLeft();
|
||
Point p2 = aVertical ? rect.BottomLeft() : rect.TopRight();
|
||
aDrawTarget.StrokeLine(p1, p2, color, strokeOptions, drawOptions);
|
||
return;
|
||
}
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE: {
|
||
/**
|
||
* We are drawing double line as:
|
||
*
|
||
* +-------------------------------------------+
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
|
||
* | |
|
||
* | |
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
|
||
* +-------------------------------------------+
|
||
*/
|
||
Point p1 = rect.TopLeft();
|
||
Point p2 = aVertical ? rect.BottomLeft() : rect.TopRight();
|
||
aDrawTarget.StrokeLine(p1, p2, color, strokeOptions, drawOptions);
|
||
|
||
if (aVertical) {
|
||
rect.width -= lineThickness;
|
||
} else {
|
||
rect.height -= lineThickness;
|
||
}
|
||
|
||
p1 = aVertical ? rect.TopRight() : rect.BottomLeft();
|
||
p2 = rect.BottomRight();
|
||
aDrawTarget.StrokeLine(p1, p2, color, strokeOptions, drawOptions);
|
||
return;
|
||
}
|
||
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY: {
|
||
/**
|
||
* We are drawing wavy line as:
|
||
*
|
||
* P: Path, X: Painted pixel
|
||
*
|
||
* +---------------------------------------+
|
||
* XX|X XXXXXX XXXXXX |
|
||
* PP|PX XPPPPPPX XPPPPPPX | ^
|
||
* XX|XPX XPXXXXXXPX XPXXXXXXPX| |
|
||
* | XPX XPX XPX XPX XP|X |adv
|
||
* | XPXXXXXXPX XPXXXXXXPX X|PX |
|
||
* | XPPPPPPX XPPPPPPX |XPX v
|
||
* | XXXXXX XXXXXX | XX
|
||
* +---------------------------------------+
|
||
* <---><---> ^
|
||
* adv flatLengthAtVertex rightMost
|
||
*
|
||
* 1. Always starts from top-left of the drawing area, however, we need
|
||
* to draw the line from outside of the rect. Because the start
|
||
* point of the line is not good style if we draw from inside it.
|
||
* 2. First, draw horizontal line from outside the rect to top-left of
|
||
* the rect;
|
||
* 3. Goes down to bottom of the area at 45 degrees.
|
||
* 4. Slides to right horizontaly, see |flatLengthAtVertex|.
|
||
* 5. Goes up to top of the area at 45 degrees.
|
||
* 6. Slides to right horizontaly.
|
||
* 7. Repeat from 2 until reached to right-most edge of the area.
|
||
*
|
||
* In the vertical case, swap horizontal and vertical coordinates and
|
||
* directions in the above description.
|
||
*/
|
||
|
||
Float& rectICoord = aVertical ? rect.y : rect.x;
|
||
Float& rectISize = aVertical ? rect.height : rect.width;
|
||
const Float rectBSize = aVertical ? rect.width : rect.height;
|
||
|
||
const Float adv = rectBSize - lineThickness;
|
||
const Float flatLengthAtVertex =
|
||
std::max((lineThickness - 1.0) * 2.0, 1.0);
|
||
|
||
// Align the start of wavy lines to the nearest ancestor block.
|
||
const Float cycleLength = 2 * (adv + flatLengthAtVertex);
|
||
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
|
||
aICoordInFrame, cycleLength,
|
||
aVertical);
|
||
// figure out if we can trim whole cycles from the left and right edges
|
||
// of the line, to try and avoid creating an unnecessarily long and
|
||
// complex path
|
||
const Float dirtyRectICoord = aVertical ? aDirtyRect.y : aDirtyRect.x;
|
||
int32_t skipCycles = floor((dirtyRectICoord - rectICoord) / cycleLength);
|
||
if (skipCycles > 0) {
|
||
rectICoord += skipCycles * cycleLength;
|
||
rectISize -= skipCycles * cycleLength;
|
||
}
|
||
|
||
rectICoord += lineThickness / 2.0;
|
||
Point pt(rect.TopLeft());
|
||
Float& ptICoord = aVertical ? pt.y : pt.x;
|
||
Float& ptBCoord = aVertical ? pt.x : pt.y;
|
||
if (aVertical) {
|
||
ptBCoord += adv + lineThickness / 2.0;
|
||
}
|
||
Float iCoordLimit = ptICoord + rectISize + lineThickness;
|
||
|
||
const Float dirtyRectIMost = aVertical ?
|
||
aDirtyRect.YMost() : aDirtyRect.XMost();
|
||
skipCycles = floor((iCoordLimit - dirtyRectIMost) / cycleLength);
|
||
if (skipCycles > 0) {
|
||
iCoordLimit -= skipCycles * cycleLength;
|
||
}
|
||
|
||
RefPtr<PathBuilder> builder = aDrawTarget.CreatePathBuilder();
|
||
RefPtr<Path> path;
|
||
|
||
ptICoord -= lineThickness;
|
||
builder->MoveTo(pt); // 1
|
||
|
||
ptICoord = rectICoord;
|
||
builder->LineTo(pt); // 2
|
||
|
||
// In vertical mode, to go "down" relative to the text we need to
|
||
// decrease the block coordinate, whereas in horizontal we increase
|
||
// it. So the sense of this flag is effectively inverted.
|
||
bool goDown = aVertical ? false : true;
|
||
uint32_t iter = 0;
|
||
while (ptICoord < iCoordLimit) {
|
||
if (++iter > 1000) {
|
||
// stroke the current path and start again, to avoid pathological
|
||
// behavior in cairo with huge numbers of path segments
|
||
path = builder->Finish();
|
||
aDrawTarget.Stroke(path, color, strokeOptions, drawOptions);
|
||
builder = aDrawTarget.CreatePathBuilder();
|
||
builder->MoveTo(pt);
|
||
iter = 0;
|
||
}
|
||
ptICoord += adv;
|
||
ptBCoord += goDown ? adv : -adv;
|
||
|
||
builder->LineTo(pt); // 3 and 5
|
||
|
||
ptICoord += flatLengthAtVertex;
|
||
builder->LineTo(pt); // 4 and 6
|
||
|
||
goDown = !goDown;
|
||
}
|
||
path = builder->Finish();
|
||
aDrawTarget.Stroke(path, color, strokeOptions, drawOptions);
|
||
return;
|
||
}
|
||
default:
|
||
NS_ERROR("Invalid style value!");
|
||
}
|
||
}
|
||
|
||
void
|
||
nsCSSRendering::DecorationLineToPath(nsIFrame* aFrame,
|
||
gfxContext* aGfxContext,
|
||
const gfxRect& aDirtyRect,
|
||
const nscolor aColor,
|
||
const gfxPoint& aPt,
|
||
const gfxFloat aICoordInFrame,
|
||
const gfxSize& aLineSize,
|
||
const gfxFloat aAscent,
|
||
const gfxFloat aOffset,
|
||
const uint8_t aDecoration,
|
||
const uint8_t aStyle,
|
||
bool aVertical,
|
||
const gfxFloat aDescentLimit)
|
||
{
|
||
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
|
||
|
||
aGfxContext->NewPath();
|
||
|
||
gfxRect rect =
|
||
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
|
||
aDecoration, aStyle, aVertical,
|
||
aDescentLimit);
|
||
if (rect.IsEmpty() || !rect.Intersects(aDirtyRect)) {
|
||
return;
|
||
}
|
||
|
||
if (aDecoration != NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE &&
|
||
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_OVERLINE &&
|
||
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH) {
|
||
NS_ERROR("Invalid decoration value!");
|
||
return;
|
||
}
|
||
|
||
if (aStyle != NS_STYLE_TEXT_DECORATION_STYLE_SOLID) {
|
||
// For the moment, we support only solid text decorations.
|
||
return;
|
||
}
|
||
|
||
gfxFloat lineThickness = std::max(NS_round(aLineSize.height), 1.0);
|
||
|
||
// The block-direction position should be set to the middle of the line.
|
||
if (aVertical) {
|
||
rect.x -= lineThickness / 2;
|
||
aGfxContext->Rectangle
|
||
(gfxRect(gfxPoint(rect.TopLeft() - gfxPoint(lineThickness / 2, 0.0)),
|
||
gfxSize(lineThickness, rect.Height())));
|
||
} else {
|
||
rect.y += lineThickness / 2;
|
||
aGfxContext->Rectangle
|
||
(gfxRect(gfxPoint(rect.TopLeft() - gfxPoint(0.0, lineThickness / 2)),
|
||
gfxSize(rect.Width(), lineThickness)));
|
||
}
|
||
}
|
||
|
||
nsRect
|
||
nsCSSRendering::GetTextDecorationRect(nsPresContext* aPresContext,
|
||
const gfxSize& aLineSize,
|
||
const gfxFloat aAscent,
|
||
const gfxFloat aOffset,
|
||
const uint8_t aDecoration,
|
||
const uint8_t aStyle,
|
||
bool aVertical,
|
||
const gfxFloat aDescentLimit)
|
||
{
|
||
NS_ASSERTION(aPresContext, "aPresContext is null");
|
||
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
|
||
|
||
gfxRect rect =
|
||
GetTextDecorationRectInternal(gfxPoint(0, 0), aLineSize, aAscent, aOffset,
|
||
aDecoration, aStyle, aVertical,
|
||
aDescentLimit);
|
||
// The rect values are already rounded to nearest device pixels.
|
||
nsRect r;
|
||
r.x = aPresContext->GfxUnitsToAppUnits(rect.X());
|
||
r.y = aPresContext->GfxUnitsToAppUnits(rect.Y());
|
||
r.width = aPresContext->GfxUnitsToAppUnits(rect.Width());
|
||
r.height = aPresContext->GfxUnitsToAppUnits(rect.Height());
|
||
return r;
|
||
}
|
||
|
||
gfxRect
|
||
nsCSSRendering::GetTextDecorationRectInternal(const gfxPoint& aPt,
|
||
const gfxSize& aLineSize,
|
||
const gfxFloat aAscent,
|
||
const gfxFloat aOffset,
|
||
const uint8_t aDecoration,
|
||
const uint8_t aStyle,
|
||
bool aVertical,
|
||
const gfxFloat aDescentLimit)
|
||
{
|
||
NS_ASSERTION(aStyle <= NS_STYLE_TEXT_DECORATION_STYLE_WAVY,
|
||
"Invalid aStyle value");
|
||
|
||
if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_NONE)
|
||
return gfxRect(0, 0, 0, 0);
|
||
|
||
bool canLiftUnderline = aDescentLimit >= 0.0;
|
||
|
||
gfxFloat iCoord = aVertical ? aPt.y : aPt.x;
|
||
gfxFloat bCoord = aVertical ? aPt.x : aPt.y;
|
||
|
||
// 'left' and 'right' are relative to the line, so for vertical writing modes
|
||
// they will actually become top and bottom of the rendered line.
|
||
// Similarly, aLineSize.width and .height are actually length and thickness
|
||
// of the line, which runs horizontally or vertically according to aVertical.
|
||
const gfxFloat left = floor(iCoord + 0.5),
|
||
right = floor(iCoord + aLineSize.width + 0.5);
|
||
|
||
// We compute |r| as if for a horizontal text run, and then swap vertical
|
||
// and horizontal coordinates at the end if vertical was requested.
|
||
gfxRect r(left, 0, right - left, 0);
|
||
|
||
gfxFloat lineThickness = NS_round(aLineSize.height);
|
||
lineThickness = std::max(lineThickness, 1.0);
|
||
|
||
gfxFloat ascent = NS_round(aAscent);
|
||
gfxFloat descentLimit = floor(aDescentLimit);
|
||
|
||
gfxFloat suggestedMaxRectHeight = std::max(std::min(ascent, descentLimit), 1.0);
|
||
r.height = lineThickness;
|
||
if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE) {
|
||
/**
|
||
* We will draw double line as:
|
||
*
|
||
* +-------------------------------------------+
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
|
||
* | | ^
|
||
* | | | gap
|
||
* | | v
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineThickness
|
||
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
|
||
* +-------------------------------------------+
|
||
*/
|
||
gfxFloat gap = NS_round(lineThickness / 2.0);
|
||
gap = std::max(gap, 1.0);
|
||
r.height = lineThickness * 2.0 + gap;
|
||
if (canLiftUnderline) {
|
||
if (r.Height() > suggestedMaxRectHeight) {
|
||
// Don't shrink the line height, because the thickness has some meaning.
|
||
// We can just shrink the gap at this time.
|
||
r.height = std::max(suggestedMaxRectHeight, lineThickness * 2.0 + 1.0);
|
||
}
|
||
}
|
||
} else if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_WAVY) {
|
||
/**
|
||
* We will draw wavy line as:
|
||
*
|
||
* +-------------------------------------------+
|
||
* |XXXXX XXXXXX XXXXXX | ^
|
||
* |XXXXXX XXXXXXXX XXXXXXXX | | lineThickness
|
||
* |XXXXXXX XXXXXXXXXX XXXXXXXXXX| v
|
||
* | XXX XXX XXX XXX XX|
|
||
* | XXXXXXXXXX XXXXXXXXXX X|
|
||
* | XXXXXXXX XXXXXXXX |
|
||
* | XXXXXX XXXXXX |
|
||
* +-------------------------------------------+
|
||
*/
|
||
r.height = lineThickness > 2.0 ? lineThickness * 4.0 : lineThickness * 3.0;
|
||
if (canLiftUnderline) {
|
||
if (r.Height() > suggestedMaxRectHeight) {
|
||
// Don't shrink the line height even if there is not enough space,
|
||
// because the thickness has some meaning. E.g., the 1px wavy line and
|
||
// 2px wavy line can be used for different meaning in IME selections
|
||
// at same time.
|
||
r.height = std::max(suggestedMaxRectHeight, lineThickness * 2.0);
|
||
}
|
||
}
|
||
}
|
||
|
||
gfxFloat baseline = floor(bCoord + aAscent + 0.5);
|
||
gfxFloat offset = 0.0;
|
||
switch (aDecoration) {
|
||
case NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE:
|
||
offset = aOffset;
|
||
if (canLiftUnderline) {
|
||
if (descentLimit < -offset + r.Height()) {
|
||
// If we can ignore the offset and the decoration line is overflowing,
|
||
// we should align the bottom edge of the decoration line rect if it's
|
||
// possible. Otherwise, we should lift up the top edge of the rect as
|
||
// far as possible.
|
||
gfxFloat offsetBottomAligned = -descentLimit + r.Height();
|
||
gfxFloat offsetTopAligned = 0.0;
|
||
offset = std::min(offsetBottomAligned, offsetTopAligned);
|
||
}
|
||
}
|
||
break;
|
||
case NS_STYLE_TEXT_DECORATION_LINE_OVERLINE:
|
||
offset = aOffset - lineThickness + r.Height();
|
||
break;
|
||
case NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH: {
|
||
gfxFloat extra = floor(r.Height() / 2.0 + 0.5);
|
||
extra = std::max(extra, lineThickness);
|
||
offset = aOffset - lineThickness + extra;
|
||
break;
|
||
}
|
||
default:
|
||
NS_ERROR("Invalid decoration value!");
|
||
}
|
||
|
||
if (aVertical) {
|
||
r.y = baseline + floor(aOffset + 0.5); // this will need updating when we
|
||
// support sideways-left orientation
|
||
Swap(r.x, r.y);
|
||
Swap(r.width, r.height);
|
||
} else {
|
||
r.y = baseline - floor(aOffset + 0.5);
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
// ------------------
|
||
// ImageRenderer
|
||
// ------------------
|
||
nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame,
|
||
const nsStyleImage* aImage,
|
||
uint32_t aFlags)
|
||
: mForFrame(aForFrame)
|
||
, mImage(aImage)
|
||
, mType(aImage->GetType())
|
||
, mImageContainer(nullptr)
|
||
, mGradientData(nullptr)
|
||
, mPaintServerFrame(nullptr)
|
||
, mIsReady(false)
|
||
, mSize(0, 0)
|
||
, mFlags(aFlags)
|
||
{
|
||
}
|
||
|
||
nsImageRenderer::~nsImageRenderer()
|
||
{
|
||
}
|
||
|
||
bool
|
||
nsImageRenderer::PrepareImage()
|
||
{
|
||
if (mImage->IsEmpty())
|
||
return false;
|
||
|
||
if (!mImage->IsComplete()) {
|
||
// Make sure the image is actually decoding
|
||
mImage->StartDecoding();
|
||
|
||
// check again to see if we finished
|
||
if (!mImage->IsComplete()) {
|
||
// We can not prepare the image for rendering if it is not fully loaded.
|
||
//
|
||
// Special case: If we requested a sync decode and we have an image, push
|
||
// on through because the Draw() will do a sync decode then
|
||
nsCOMPtr<imgIContainer> img;
|
||
if (!((mFlags & FLAG_SYNC_DECODE_IMAGES) &&
|
||
(mType == eStyleImageType_Image) &&
|
||
(NS_SUCCEEDED(mImage->GetImageData()->GetImage(getter_AddRefs(img))))))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
switch (mType) {
|
||
case eStyleImageType_Image:
|
||
{
|
||
nsCOMPtr<imgIContainer> srcImage;
|
||
DebugOnly<nsresult> rv =
|
||
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
|
||
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) && srcImage,
|
||
"If GetImage() is failing, mImage->IsComplete() "
|
||
"should have returned false");
|
||
|
||
if (!mImage->GetCropRect()) {
|
||
mImageContainer.swap(srcImage);
|
||
} else {
|
||
nsIntRect actualCropRect;
|
||
bool isEntireImage;
|
||
bool success =
|
||
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
|
||
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
|
||
if (!success || actualCropRect.IsEmpty()) {
|
||
// The cropped image has zero size
|
||
return false;
|
||
}
|
||
if (isEntireImage) {
|
||
// The cropped image is identical to the source image
|
||
mImageContainer.swap(srcImage);
|
||
} else {
|
||
nsCOMPtr<imgIContainer> subImage = ImageOps::Clip(srcImage, actualCropRect);
|
||
mImageContainer.swap(subImage);
|
||
}
|
||
}
|
||
mIsReady = true;
|
||
break;
|
||
}
|
||
case eStyleImageType_Gradient:
|
||
mGradientData = mImage->GetGradientData();
|
||
mIsReady = true;
|
||
break;
|
||
case eStyleImageType_Element:
|
||
{
|
||
nsAutoString elementId =
|
||
NS_LITERAL_STRING("#") + nsDependentString(mImage->GetElementId());
|
||
nsCOMPtr<nsIURI> targetURI;
|
||
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
|
||
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
|
||
mForFrame->GetContent()->GetCurrentDoc(), base);
|
||
nsSVGPaintingProperty* property = nsSVGEffects::GetPaintingPropertyForURI(
|
||
targetURI, mForFrame->FirstContinuation(),
|
||
nsSVGEffects::BackgroundImageProperty());
|
||
if (!property)
|
||
return false;
|
||
mPaintServerFrame = property->GetReferencedFrame();
|
||
|
||
// If the referenced element doesn't have a frame we might still be able
|
||
// to paint it if it's an <img>, <canvas>, or <video> element.
|
||
if (!mPaintServerFrame) {
|
||
mImageElementSurface =
|
||
nsLayoutUtils::SurfaceFromElement(property->GetReferencedElement());
|
||
if (!mImageElementSurface.mSourceSurface)
|
||
return false;
|
||
}
|
||
mIsReady = true;
|
||
break;
|
||
}
|
||
case eStyleImageType_Null:
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return mIsReady;
|
||
}
|
||
|
||
nsSize
|
||
CSSSizeOrRatio::ComputeConcreteSize() const
|
||
{
|
||
NS_ASSERTION(CanComputeConcreteSize(), "Cannot compute");
|
||
if (mHasWidth && mHasHeight) {
|
||
return nsSize(mWidth, mHeight);
|
||
}
|
||
if (mHasWidth) {
|
||
nscoord height = NSCoordSaturatingNonnegativeMultiply(
|
||
mWidth,
|
||
double(mRatio.height) / mRatio.width);
|
||
return nsSize(mWidth, height);
|
||
}
|
||
|
||
MOZ_ASSERT(mHasHeight);
|
||
nscoord width = NSCoordSaturatingNonnegativeMultiply(
|
||
mHeight,
|
||
double(mRatio.width) / mRatio.height);
|
||
return nsSize(width, mHeight);
|
||
}
|
||
|
||
CSSSizeOrRatio
|
||
nsImageRenderer::ComputeIntrinsicSize()
|
||
{
|
||
NS_ASSERTION(mIsReady, "Ensure PrepareImage() has returned true "
|
||
"before calling me");
|
||
|
||
CSSSizeOrRatio result;
|
||
switch (mType) {
|
||
case eStyleImageType_Image:
|
||
{
|
||
bool haveWidth, haveHeight;
|
||
nsIntSize imageIntSize;
|
||
nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, imageIntSize,
|
||
result.mRatio, haveWidth, haveHeight);
|
||
if (haveWidth) {
|
||
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(imageIntSize.width));
|
||
}
|
||
if (haveHeight) {
|
||
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(imageIntSize.height));
|
||
}
|
||
break;
|
||
}
|
||
case eStyleImageType_Element:
|
||
{
|
||
// XXX element() should have the width/height of the referenced element,
|
||
// and that element's ratio, if it matches. If it doesn't match, it
|
||
// should have no width/height or ratio. See element() in CSS images:
|
||
// <http://dev.w3.org/csswg/css-images-4/#element-notation>.
|
||
// Make sure to change nsStyleBackground::Size::DependsOnFrameSize
|
||
// when fixing this!
|
||
if (mPaintServerFrame) {
|
||
// SVG images have no intrinsic size
|
||
if (!mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
|
||
// The intrinsic image size for a generic nsIFrame paint server is
|
||
// the union of the border-box rects of all of its continuations,
|
||
// rounded to device pixels.
|
||
int32_t appUnitsPerDevPixel =
|
||
mForFrame->PresContext()->AppUnitsPerDevPixel();
|
||
result.SetSize(
|
||
nsSVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame).
|
||
ToNearestPixels(appUnitsPerDevPixel).
|
||
ToAppUnits(appUnitsPerDevPixel));
|
||
}
|
||
} else {
|
||
NS_ASSERTION(mImageElementSurface.mSourceSurface, "Surface should be ready.");
|
||
gfxIntSize surfaceSize = mImageElementSurface.mSize;
|
||
result.SetSize(
|
||
nsSize(nsPresContext::CSSPixelsToAppUnits(surfaceSize.width),
|
||
nsPresContext::CSSPixelsToAppUnits(surfaceSize.height)));
|
||
}
|
||
break;
|
||
}
|
||
case eStyleImageType_Gradient:
|
||
// Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
|
||
// intrinsic dimensions.
|
||
case eStyleImageType_Null:
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* static */ nsSize
|
||
nsImageRenderer::ComputeConcreteSize(const CSSSizeOrRatio& aSpecifiedSize,
|
||
const CSSSizeOrRatio& aIntrinsicSize,
|
||
const nsSize& aDefaultSize)
|
||
{
|
||
// The specified size is fully specified, just use that
|
||
if (aSpecifiedSize.IsConcrete()) {
|
||
return aSpecifiedSize.ComputeConcreteSize();
|
||
}
|
||
|
||
MOZ_ASSERT(!aSpecifiedSize.mHasWidth || !aSpecifiedSize.mHasHeight);
|
||
|
||
if (!aSpecifiedSize.mHasWidth && !aSpecifiedSize.mHasHeight) {
|
||
// no specified size, try using the intrinsic size
|
||
if (aIntrinsicSize.CanComputeConcreteSize()) {
|
||
return aIntrinsicSize.ComputeConcreteSize();
|
||
}
|
||
|
||
if (aIntrinsicSize.mHasWidth) {
|
||
return nsSize(aIntrinsicSize.mWidth, aDefaultSize.height);
|
||
}
|
||
if (aIntrinsicSize.mHasHeight) {
|
||
return nsSize(aDefaultSize.width, aIntrinsicSize.mHeight);
|
||
}
|
||
|
||
// couldn't use the intrinsic size either, revert to using the default size
|
||
return ComputeConstrainedSize(aDefaultSize,
|
||
aIntrinsicSize.mRatio,
|
||
CONTAIN);
|
||
}
|
||
|
||
MOZ_ASSERT(aSpecifiedSize.mHasWidth || aSpecifiedSize.mHasHeight);
|
||
|
||
// The specified height is partial, try to compute the missing part.
|
||
if (aSpecifiedSize.mHasWidth) {
|
||
nscoord height;
|
||
if (aIntrinsicSize.HasRatio()) {
|
||
height = NSCoordSaturatingNonnegativeMultiply(
|
||
aSpecifiedSize.mWidth,
|
||
double(aIntrinsicSize.mRatio.height) / aIntrinsicSize.mRatio.width);
|
||
} else if (aIntrinsicSize.mHasHeight) {
|
||
height = aIntrinsicSize.mHeight;
|
||
} else {
|
||
height = aDefaultSize.height;
|
||
}
|
||
return nsSize(aSpecifiedSize.mWidth, height);
|
||
}
|
||
|
||
MOZ_ASSERT(aSpecifiedSize.mHasHeight);
|
||
nscoord width;
|
||
if (aIntrinsicSize.HasRatio()) {
|
||
width = NSCoordSaturatingNonnegativeMultiply(
|
||
aSpecifiedSize.mHeight,
|
||
double(aIntrinsicSize.mRatio.width) / aIntrinsicSize.mRatio.height);
|
||
} else if (aIntrinsicSize.mHasWidth) {
|
||
width = aIntrinsicSize.mWidth;
|
||
} else {
|
||
width = aDefaultSize.width;
|
||
}
|
||
return nsSize(width, aSpecifiedSize.mHeight);
|
||
}
|
||
|
||
/* static */ nsSize
|
||
nsImageRenderer::ComputeConstrainedSize(const nsSize& aConstrainingSize,
|
||
const nsSize& aIntrinsicRatio,
|
||
FitType aFitType)
|
||
{
|
||
if (aIntrinsicRatio.width <= 0 && aIntrinsicRatio.height <= 0) {
|
||
return aConstrainingSize;
|
||
}
|
||
|
||
float scaleX = double(aConstrainingSize.width) / aIntrinsicRatio.width;
|
||
float scaleY = double(aConstrainingSize.height) / aIntrinsicRatio.height;
|
||
nsSize size;
|
||
if ((aFitType == CONTAIN) == (scaleX < scaleY)) {
|
||
size.width = aConstrainingSize.width;
|
||
size.height = NSCoordSaturatingNonnegativeMultiply(
|
||
aIntrinsicRatio.height, scaleX);
|
||
} else {
|
||
size.width = NSCoordSaturatingNonnegativeMultiply(
|
||
aIntrinsicRatio.width, scaleY);
|
||
size.height = aConstrainingSize.height;
|
||
}
|
||
return size;
|
||
}
|
||
|
||
/**
|
||
* mSize is the image's "preferred" size for this particular rendering, while
|
||
* the drawn (aka concrete) size is the actual rendered size after accounting
|
||
* for background-size etc.. The preferred size is most often the image's
|
||
* intrinsic dimensions. But for images with incomplete intrinsic dimensions,
|
||
* the preferred size varies, depending on the specified and default sizes, see
|
||
* nsImageRenderer::Compute*Size.
|
||
*
|
||
* This distinction is necessary because the components of a vector image are
|
||
* specified with respect to its preferred size for a rendering situation, not
|
||
* to its actual rendered size. For example, consider a 4px wide background
|
||
* vector image with no height which contains a left-aligned
|
||
* 2px wide black rectangle with height 100%. If the background-size width is
|
||
* auto (or 4px), the vector image will render 4px wide, and the black rectangle
|
||
* will be 2px wide. If the background-size width is 8px, the vector image will
|
||
* render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
|
||
* In both cases mSize.width will be 4px; but in the first case the returned
|
||
* width will be 4px, while in the second case the returned width will be 8px.
|
||
*/
|
||
void
|
||
nsImageRenderer::SetPreferredSize(const CSSSizeOrRatio& aIntrinsicSize,
|
||
const nsSize& aDefaultSize)
|
||
{
|
||
mSize.width = aIntrinsicSize.mHasWidth
|
||
? aIntrinsicSize.mWidth
|
||
: aDefaultSize.width;
|
||
mSize.height = aIntrinsicSize.mHasHeight
|
||
? aIntrinsicSize.mHeight
|
||
: aDefaultSize.height;
|
||
}
|
||
|
||
// Convert from nsImageRenderer flags to the flags we want to use for drawing in
|
||
// the imgIContainer namespace.
|
||
static uint32_t
|
||
ConvertImageRendererToDrawFlags(uint32_t aImageRendererFlags)
|
||
{
|
||
uint32_t drawFlags = imgIContainer::FLAG_NONE;
|
||
if (aImageRendererFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
|
||
drawFlags |= imgIContainer::FLAG_SYNC_DECODE;
|
||
}
|
||
if (aImageRendererFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
|
||
drawFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
|
||
}
|
||
return drawFlags;
|
||
}
|
||
|
||
void
|
||
nsImageRenderer::Draw(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aDest,
|
||
const nsRect& aFill,
|
||
const nsPoint& aAnchor,
|
||
const CSSIntRect& aSrc)
|
||
{
|
||
if (!mIsReady) {
|
||
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
|
||
return;
|
||
}
|
||
if (aDest.IsEmpty() || aFill.IsEmpty() ||
|
||
mSize.width <= 0 || mSize.height <= 0) {
|
||
return;
|
||
}
|
||
|
||
GraphicsFilter filter = nsLayoutUtils::GetGraphicsFilterForFrame(mForFrame);
|
||
|
||
switch (mType) {
|
||
case eStyleImageType_Image:
|
||
{
|
||
nsIntSize imageSize(nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
|
||
nsPresContext::AppUnitsToIntCSSPixels(mSize.height));
|
||
nsLayoutUtils::DrawBackgroundImage(*aRenderingContext.ThebesContext(),
|
||
aPresContext,
|
||
mImageContainer, imageSize, filter,
|
||
aDest, aFill, aAnchor, aDirtyRect,
|
||
ConvertImageRendererToDrawFlags(mFlags));
|
||
return;
|
||
}
|
||
case eStyleImageType_Gradient:
|
||
{
|
||
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
|
||
mGradientData, aDirtyRect,
|
||
aDest, aFill, aSrc, mSize);
|
||
return;
|
||
}
|
||
case eStyleImageType_Element:
|
||
{
|
||
nsRefPtr<gfxDrawable> drawable = DrawableForElement(aDest,
|
||
aRenderingContext);
|
||
if (!drawable) {
|
||
NS_WARNING("Could not create drawable for element");
|
||
return;
|
||
}
|
||
|
||
gfxContext* ctx = aRenderingContext.ThebesContext();
|
||
gfxContext::GraphicsOperator op = ctx->CurrentOperator();
|
||
if (op != gfxContext::OPERATOR_OVER) {
|
||
ctx->PushGroup(gfxContentType::COLOR_ALPHA);
|
||
ctx->SetOperator(gfxContext::OPERATOR_OVER);
|
||
}
|
||
|
||
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
|
||
nsLayoutUtils::DrawImage(*aRenderingContext.ThebesContext(),
|
||
aPresContext, image,
|
||
filter, aDest, aFill, aAnchor, aDirtyRect,
|
||
ConvertImageRendererToDrawFlags(mFlags));
|
||
|
||
if (op != gfxContext::OPERATOR_OVER) {
|
||
ctx->PopGroupToSource();
|
||
ctx->Paint();
|
||
}
|
||
|
||
return;
|
||
}
|
||
case eStyleImageType_Null:
|
||
default:
|
||
return;
|
||
}
|
||
}
|
||
|
||
already_AddRefed<gfxDrawable>
|
||
nsImageRenderer::DrawableForElement(const nsRect& aImageRect,
|
||
nsRenderingContext& aRenderingContext)
|
||
{
|
||
NS_ASSERTION(mType == eStyleImageType_Element,
|
||
"DrawableForElement only makes sense if backed by an element");
|
||
if (mPaintServerFrame) {
|
||
int32_t appUnitsPerDevPixel = mForFrame->PresContext()->AppUnitsPerDevPixel();
|
||
nsRect destRect = aImageRect - aImageRect.TopLeft();
|
||
nsIntSize roundedOut = destRect.ToOutsidePixels(appUnitsPerDevPixel).Size();
|
||
gfxIntSize imageSize(roundedOut.width, roundedOut.height);
|
||
nsRefPtr<gfxDrawable> drawable =
|
||
nsSVGIntegrationUtils::DrawableFromPaintServer(
|
||
mPaintServerFrame, mForFrame, mSize, imageSize,
|
||
aRenderingContext.GetDrawTarget(),
|
||
aRenderingContext.ThebesContext()->CurrentMatrix(),
|
||
mFlags & FLAG_SYNC_DECODE_IMAGES
|
||
? nsSVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES
|
||
: 0);
|
||
|
||
return drawable.forget();
|
||
}
|
||
NS_ASSERTION(mImageElementSurface.mSourceSurface, "Surface should be ready.");
|
||
nsRefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(
|
||
mImageElementSurface.mSourceSurface,
|
||
mImageElementSurface.mSize);
|
||
return drawable.forget();
|
||
}
|
||
|
||
void
|
||
nsImageRenderer::DrawBackground(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
const nsRect& aDest,
|
||
const nsRect& aFill,
|
||
const nsPoint& aAnchor,
|
||
const nsRect& aDirty)
|
||
{
|
||
if (!mIsReady) {
|
||
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
|
||
return;
|
||
}
|
||
if (aDest.IsEmpty() || aFill.IsEmpty() ||
|
||
mSize.width <= 0 || mSize.height <= 0) {
|
||
return;
|
||
}
|
||
|
||
Draw(aPresContext, aRenderingContext,
|
||
aDirty, aDest, aFill, aAnchor,
|
||
CSSIntRect(0, 0,
|
||
nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
|
||
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)));
|
||
}
|
||
|
||
/**
|
||
* Compute the size and position of the master copy of the image. I.e., a single
|
||
* tile used to fill the dest rect.
|
||
* aFill The destination rect to be filled
|
||
* aHFill and aVFill are the repeat patterns for the component -
|
||
* NS_STYLE_BORDER_IMAGE_REPEAT_* - i.e., how a tiling unit is used to fill aFill
|
||
* aUnitSize The size of the source rect in dest coords.
|
||
*/
|
||
static nsRect
|
||
ComputeTile(const nsRect& aFill,
|
||
uint8_t aHFill,
|
||
uint8_t aVFill,
|
||
const nsSize& aUnitSize)
|
||
{
|
||
nsRect tile;
|
||
switch (aHFill) {
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
|
||
tile.x = aFill.x;
|
||
tile.width = aFill.width;
|
||
break;
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
|
||
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
|
||
tile.width = aUnitSize.width;
|
||
break;
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
|
||
tile.x = aFill.x;
|
||
tile.width = aFill.width / ceil(gfxFloat(aFill.width)/aUnitSize.width);
|
||
break;
|
||
default:
|
||
NS_NOTREACHED("unrecognized border-image fill style");
|
||
}
|
||
|
||
switch (aVFill) {
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
|
||
tile.y = aFill.y;
|
||
tile.height = aFill.height;
|
||
break;
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
|
||
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
|
||
tile.height = aUnitSize.height;
|
||
break;
|
||
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
|
||
tile.y = aFill.y;
|
||
tile.height = aFill.height/ceil(gfxFloat(aFill.height)/aUnitSize.height);
|
||
break;
|
||
default:
|
||
NS_NOTREACHED("unrecognized border-image fill style");
|
||
}
|
||
|
||
return tile;
|
||
}
|
||
|
||
/**
|
||
* Returns true if the given set of arguments will require the tiles which fill
|
||
* the dest rect to be scaled from the source tile. See comment on ComputeTile
|
||
* for argument descriptions.
|
||
*/
|
||
static bool
|
||
RequiresScaling(const nsRect& aFill,
|
||
uint8_t aHFill,
|
||
uint8_t aVFill,
|
||
const nsSize& aUnitSize)
|
||
{
|
||
// If we have no tiling in either direction, we can skip the intermediate
|
||
// scaling step.
|
||
return (aHFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH ||
|
||
aVFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH) &&
|
||
(aUnitSize.width != aFill.width ||
|
||
aUnitSize.height != aFill.height);
|
||
}
|
||
|
||
void
|
||
nsImageRenderer::DrawBorderImageComponent(nsPresContext* aPresContext,
|
||
nsRenderingContext& aRenderingContext,
|
||
const nsRect& aDirtyRect,
|
||
const nsRect& aFill,
|
||
const CSSIntRect& aSrc,
|
||
uint8_t aHFill,
|
||
uint8_t aVFill,
|
||
const nsSize& aUnitSize,
|
||
uint8_t aIndex)
|
||
{
|
||
if (!mIsReady) {
|
||
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
|
||
return;
|
||
}
|
||
if (aFill.IsEmpty() || aSrc.IsEmpty()) {
|
||
return;
|
||
}
|
||
|
||
if (mType == eStyleImageType_Image || mType == eStyleImageType_Element) {
|
||
nsCOMPtr<imgIContainer> subImage;
|
||
|
||
// Retrieve or create the subimage we'll draw.
|
||
nsIntRect srcRect(aSrc.x, aSrc.y, aSrc.width, aSrc.height);
|
||
if (mType == eStyleImageType_Image) {
|
||
if ((subImage = mImage->GetSubImage(aIndex)) == nullptr) {
|
||
subImage = ImageOps::Clip(mImageContainer, srcRect);
|
||
mImage->SetSubImage(aIndex, subImage);
|
||
}
|
||
} else {
|
||
// This path, for eStyleImageType_Element, is currently slower than it
|
||
// needs to be because we don't cache anything. (In particular, if we have
|
||
// to draw to a temporary surface inside ClippedImage, we don't cache that
|
||
// temporary surface since we immediately throw the ClippedImage we create
|
||
// here away.) However, if we did cache, we'd need to know when to
|
||
// invalidate that cache, and it's not clear that it's worth the trouble
|
||
// since using border-image with -moz-element is rare.
|
||
|
||
nsRefPtr<gfxDrawable> drawable = DrawableForElement(nsRect(nsPoint(), mSize),
|
||
aRenderingContext);
|
||
if (!drawable) {
|
||
NS_WARNING("Could not create drawable for element");
|
||
return;
|
||
}
|
||
|
||
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
|
||
subImage = ImageOps::Clip(image, srcRect);
|
||
}
|
||
|
||
GraphicsFilter graphicsFilter =
|
||
nsLayoutUtils::GetGraphicsFilterForFrame(mForFrame);
|
||
|
||
if (!RequiresScaling(aFill, aHFill, aVFill, aUnitSize)) {
|
||
nsLayoutUtils::DrawSingleImage(*aRenderingContext.ThebesContext(),
|
||
aPresContext,
|
||
subImage,
|
||
graphicsFilter,
|
||
aFill, aDirtyRect,
|
||
nullptr,
|
||
imgIContainer::FLAG_NONE);
|
||
return;
|
||
}
|
||
|
||
nsRect tile = ComputeTile(aFill, aHFill, aVFill, aUnitSize);
|
||
nsLayoutUtils::DrawImage(*aRenderingContext.ThebesContext(),
|
||
aPresContext,
|
||
subImage,
|
||
graphicsFilter,
|
||
tile, aFill, tile.TopLeft(), aDirtyRect,
|
||
imgIContainer::FLAG_NONE);
|
||
return;
|
||
}
|
||
|
||
nsRect destTile = RequiresScaling(aFill, aHFill, aVFill, aUnitSize)
|
||
? ComputeTile(aFill, aHFill, aVFill, aUnitSize)
|
||
: aFill;
|
||
|
||
Draw(aPresContext, aRenderingContext, aDirtyRect, destTile,
|
||
aFill, destTile.TopLeft(), aSrc);
|
||
}
|
||
|
||
bool
|
||
nsImageRenderer::IsRasterImage()
|
||
{
|
||
if (mType != eStyleImageType_Image || !mImageContainer)
|
||
return false;
|
||
return mImageContainer->GetType() == imgIContainer::TYPE_RASTER;
|
||
}
|
||
|
||
bool
|
||
nsImageRenderer::IsAnimatedImage()
|
||
{
|
||
if (mType != eStyleImageType_Image || !mImageContainer)
|
||
return false;
|
||
bool animated = false;
|
||
if (NS_SUCCEEDED(mImageContainer->GetAnimated(&animated)) && animated)
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
already_AddRefed<mozilla::layers::ImageContainer>
|
||
nsImageRenderer::GetContainer(LayerManager* aManager)
|
||
{
|
||
if (mType != eStyleImageType_Image || !mImageContainer)
|
||
return nullptr;
|
||
|
||
nsRefPtr<ImageContainer> container;
|
||
nsresult rv = mImageContainer->GetImageContainer(aManager, getter_AddRefs(container));
|
||
NS_ENSURE_SUCCESS(rv, nullptr);
|
||
return container.forget();
|
||
}
|
||
|
||
#define MAX_BLUR_RADIUS 300
|
||
#define MAX_SPREAD_RADIUS 50
|
||
|
||
static inline gfxPoint ComputeBlurStdDev(nscoord aBlurRadius,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
gfxFloat aScaleX,
|
||
gfxFloat aScaleY)
|
||
{
|
||
// http://dev.w3.org/csswg/css3-background/#box-shadow says that the
|
||
// standard deviation of the blur should be half the given blur value.
|
||
gfxFloat blurStdDev = gfxFloat(aBlurRadius) / gfxFloat(aAppUnitsPerDevPixel);
|
||
|
||
return gfxPoint(std::min((blurStdDev * aScaleX),
|
||
gfxFloat(MAX_BLUR_RADIUS)) / 2.0,
|
||
std::min((blurStdDev * aScaleY),
|
||
gfxFloat(MAX_BLUR_RADIUS)) / 2.0);
|
||
}
|
||
|
||
static inline gfxIntSize
|
||
ComputeBlurRadius(nscoord aBlurRadius,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
gfxFloat aScaleX = 1.0,
|
||
gfxFloat aScaleY = 1.0)
|
||
{
|
||
gfxPoint scaledBlurStdDev = ComputeBlurStdDev(aBlurRadius, aAppUnitsPerDevPixel,
|
||
aScaleX, aScaleY);
|
||
return
|
||
gfxAlphaBoxBlur::CalculateBlurRadius(scaledBlurStdDev);
|
||
}
|
||
|
||
// -----
|
||
// nsContextBoxBlur
|
||
// -----
|
||
gfxContext*
|
||
nsContextBoxBlur::Init(const nsRect& aRect, nscoord aSpreadRadius,
|
||
nscoord aBlurRadius,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
gfxContext* aDestinationCtx,
|
||
const nsRect& aDirtyRect,
|
||
const gfxRect* aSkipRect,
|
||
uint32_t aFlags)
|
||
{
|
||
if (aRect.IsEmpty()) {
|
||
mContext = nullptr;
|
||
return nullptr;
|
||
}
|
||
|
||
gfxFloat scaleX = 1;
|
||
gfxFloat scaleY = 1;
|
||
|
||
// Do blurs in device space when possible.
|
||
// Chrome/Skia always does the blurs in device space
|
||
// and will sometimes get incorrect results (e.g. rotated blurs)
|
||
gfxMatrix transform = aDestinationCtx->CurrentMatrix();
|
||
// XXX: we could probably handle negative scales but for now it's easier just to fallback
|
||
if (transform.HasNonAxisAlignedTransform() || transform._11 <= 0.0 || transform._22 <= 0.0) {
|
||
transform = gfxMatrix();
|
||
} else {
|
||
scaleX = transform._11;
|
||
scaleY = transform._22;
|
||
}
|
||
|
||
// compute a large or smaller blur radius
|
||
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel, scaleX, scaleY);
|
||
gfxIntSize spreadRadius = gfxIntSize(std::min(int32_t(aSpreadRadius * scaleX / aAppUnitsPerDevPixel),
|
||
int32_t(MAX_SPREAD_RADIUS)),
|
||
std::min(int32_t(aSpreadRadius * scaleY / aAppUnitsPerDevPixel),
|
||
int32_t(MAX_SPREAD_RADIUS)));
|
||
mDestinationCtx = aDestinationCtx;
|
||
|
||
// If not blurring, draw directly onto the destination device
|
||
if (blurRadius.width <= 0 && blurRadius.height <= 0 &&
|
||
spreadRadius.width <= 0 && spreadRadius.height <= 0 &&
|
||
!(aFlags & FORCE_MASK)) {
|
||
mContext = aDestinationCtx;
|
||
return mContext;
|
||
}
|
||
|
||
// Convert from app units to device pixels
|
||
gfxRect rect = nsLayoutUtils::RectToGfxRect(aRect, aAppUnitsPerDevPixel);
|
||
|
||
gfxRect dirtyRect =
|
||
nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
|
||
dirtyRect.RoundOut();
|
||
|
||
rect = transform.TransformBounds(rect);
|
||
|
||
mPreTransformed = !transform.IsIdentity();
|
||
|
||
// Create the temporary surface for blurring
|
||
dirtyRect = transform.TransformBounds(dirtyRect);
|
||
if (aSkipRect) {
|
||
gfxRect skipRect = transform.TransformBounds(*aSkipRect);
|
||
mContext = mAlphaBoxBlur.Init(rect, spreadRadius,
|
||
blurRadius, &dirtyRect, &skipRect);
|
||
} else {
|
||
mContext = mAlphaBoxBlur.Init(rect, spreadRadius,
|
||
blurRadius, &dirtyRect, nullptr);
|
||
}
|
||
|
||
if (mContext) {
|
||
// we don't need to blur if skipRect is equal to rect
|
||
// and mContext will be nullptr
|
||
mContext->Multiply(transform);
|
||
}
|
||
return mContext;
|
||
}
|
||
|
||
void
|
||
nsContextBoxBlur::DoPaint()
|
||
{
|
||
if (mContext == mDestinationCtx)
|
||
return;
|
||
|
||
gfxContextMatrixAutoSaveRestore saveMatrix(mDestinationCtx);
|
||
|
||
if (mPreTransformed) {
|
||
mDestinationCtx->SetMatrix(gfxMatrix());
|
||
}
|
||
|
||
mAlphaBoxBlur.Paint(mDestinationCtx);
|
||
}
|
||
|
||
gfxContext*
|
||
nsContextBoxBlur::GetContext()
|
||
{
|
||
return mContext;
|
||
}
|
||
|
||
/* static */ nsMargin
|
||
nsContextBoxBlur::GetBlurRadiusMargin(nscoord aBlurRadius,
|
||
int32_t aAppUnitsPerDevPixel)
|
||
{
|
||
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel);
|
||
|
||
nsMargin result;
|
||
result.top = result.bottom = blurRadius.height * aAppUnitsPerDevPixel;
|
||
result.left = result.right = blurRadius.width * aAppUnitsPerDevPixel;
|
||
return result;
|
||
}
|
||
|
||
/* static */ void
|
||
nsContextBoxBlur::BlurRectangle(gfxContext* aDestinationCtx,
|
||
const nsRect& aRect,
|
||
int32_t aAppUnitsPerDevPixel,
|
||
RectCornerRadii* aCornerRadii,
|
||
nscoord aBlurRadius,
|
||
const gfxRGBA& aShadowColor,
|
||
const nsRect& aDirtyRect,
|
||
const gfxRect& aSkipRect)
|
||
{
|
||
DrawTarget& aDestDrawTarget = *aDestinationCtx->GetDrawTarget();
|
||
|
||
if (aRect.IsEmpty()) {
|
||
return;
|
||
}
|
||
|
||
Rect shadowGfxRect = NSRectToRect(aRect, aAppUnitsPerDevPixel);
|
||
|
||
if (aBlurRadius <= 0) {
|
||
ColorPattern color(ToDeviceColor(aShadowColor));
|
||
if (aCornerRadii) {
|
||
RefPtr<Path> roundedRect = MakePathForRoundedRect(aDestDrawTarget,
|
||
shadowGfxRect,
|
||
*aCornerRadii);
|
||
aDestDrawTarget.Fill(roundedRect, color);
|
||
} else {
|
||
aDestDrawTarget.FillRect(shadowGfxRect, color);
|
||
}
|
||
return;
|
||
}
|
||
|
||
gfxFloat scaleX = 1;
|
||
gfxFloat scaleY = 1;
|
||
|
||
// Do blurs in device space when possible.
|
||
// Chrome/Skia always does the blurs in device space
|
||
// and will sometimes get incorrect results (e.g. rotated blurs)
|
||
gfxMatrix transform = aDestinationCtx->CurrentMatrix();
|
||
// XXX: we could probably handle negative scales but for now it's easier just to fallback
|
||
if (!transform.HasNonAxisAlignedTransform() && transform._11 > 0.0 && transform._22 > 0.0) {
|
||
scaleX = transform._11;
|
||
scaleY = transform._22;
|
||
aDestinationCtx->SetMatrix(gfxMatrix());
|
||
} else {
|
||
transform = gfxMatrix();
|
||
}
|
||
|
||
gfxPoint blurStdDev = ComputeBlurStdDev(aBlurRadius, aAppUnitsPerDevPixel, scaleX, scaleY);
|
||
|
||
gfxRect dirtyRect =
|
||
nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
|
||
dirtyRect.RoundOut();
|
||
|
||
gfxRect shadowThebesRect = transform.TransformBounds(ThebesRect(shadowGfxRect));
|
||
dirtyRect = transform.TransformBounds(dirtyRect);
|
||
gfxRect skipRect = transform.TransformBounds(aSkipRect);
|
||
|
||
if (aCornerRadii) {
|
||
aCornerRadii->Scale(scaleX, scaleY);
|
||
}
|
||
|
||
gfxAlphaBoxBlur::BlurRectangle(aDestinationCtx,
|
||
shadowThebesRect,
|
||
aCornerRadii,
|
||
blurStdDev,
|
||
aShadowColor,
|
||
dirtyRect,
|
||
skipRect);
|
||
}
|