зеркало из https://github.com/mozilla/gecko-dev.git
491 строка
18 KiB
C++
491 строка
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "DisplayItemClip.h"
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#include "gfxContext.h"
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/PathHelpers.h"
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#include "mozilla/layers/StackingContextHelper.h"
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#include "mozilla/webrender/WebRenderTypes.h"
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#include "nsPresContext.h"
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#include "nsCSSRendering.h"
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#include "nsLayoutUtils.h"
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#include "nsRegion.h"
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using namespace mozilla::gfx;
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namespace mozilla {
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void DisplayItemClip::SetTo(const nsRect& aRect) { SetTo(aRect, nullptr); }
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void DisplayItemClip::SetTo(const nsRect& aRect, const nscoord* aRadii) {
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mHaveClipRect = true;
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mClipRect = aRect;
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if (aRadii) {
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mRoundedClipRects.SetLength(1);
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mRoundedClipRects[0].mRect = aRect;
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memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord) * 8);
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} else {
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mRoundedClipRects.Clear();
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}
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}
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void DisplayItemClip::SetTo(const nsRect& aRect, const nsRect& aRoundedRect,
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const nscoord* aRadii) {
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mHaveClipRect = true;
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mClipRect = aRect;
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mRoundedClipRects.SetLength(1);
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mRoundedClipRects[0].mRect = aRoundedRect;
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memcpy(mRoundedClipRects[0].mRadii, aRadii, sizeof(nscoord) * 8);
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}
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bool DisplayItemClip::MayIntersect(const nsRect& aRect) const {
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if (!mHaveClipRect) {
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return !aRect.IsEmpty();
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}
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nsRect r = aRect.Intersect(mClipRect);
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if (r.IsEmpty()) {
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return false;
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}
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for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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if (!nsLayoutUtils::RoundedRectIntersectsRect(rr.mRect, rr.mRadii, r)) {
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return false;
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}
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}
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return true;
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}
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void DisplayItemClip::IntersectWith(const DisplayItemClip& aOther) {
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if (!aOther.mHaveClipRect) {
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return;
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}
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if (!mHaveClipRect) {
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*this = aOther;
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return;
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}
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if (!mClipRect.IntersectRect(mClipRect, aOther.mClipRect)) {
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mRoundedClipRects.Clear();
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return;
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}
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mRoundedClipRects.AppendElements(aOther.mRoundedClipRects);
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}
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void DisplayItemClip::ApplyTo(gfxContext* aContext, int32_t A2D) const {
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ApplyRectTo(aContext, A2D);
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ApplyRoundedRectClipsTo(aContext, A2D, 0, mRoundedClipRects.Length());
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}
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void DisplayItemClip::ApplyRectTo(gfxContext* aContext, int32_t A2D) const {
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aContext->NewPath();
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gfxRect clip = nsLayoutUtils::RectToGfxRect(mClipRect, A2D);
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aContext->SnappedRectangle(clip);
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aContext->Clip();
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}
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void DisplayItemClip::ApplyRoundedRectClipsTo(gfxContext* aContext, int32_t A2D,
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uint32_t aBegin,
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uint32_t aEnd) const {
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DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
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aEnd = std::min<uint32_t>(aEnd, mRoundedClipRects.Length());
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for (uint32_t i = aBegin; i < aEnd; ++i) {
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RefPtr<Path> roundedRect =
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MakeRoundedRectPath(aDrawTarget, A2D, mRoundedClipRects[i]);
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aContext->Clip(roundedRect);
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}
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}
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void DisplayItemClip::FillIntersectionOfRoundedRectClips(
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gfxContext* aContext, const Color& aColor,
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int32_t aAppUnitsPerDevPixel) const {
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DrawTarget& aDrawTarget = *aContext->GetDrawTarget();
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uint32_t end = mRoundedClipRects.Length();
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if (!end) {
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return;
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}
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// Push clips for any rects that come BEFORE the rect at |aEnd - 1|, if any:
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ApplyRoundedRectClipsTo(aContext, aAppUnitsPerDevPixel, 0, end - 1);
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// Now fill the rect at |aEnd - 1|:
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RefPtr<Path> roundedRect = MakeRoundedRectPath(
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aDrawTarget, aAppUnitsPerDevPixel, mRoundedClipRects[end - 1]);
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ColorPattern color(ToDeviceColor(aColor));
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aDrawTarget.Fill(roundedRect, color);
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// Finally, pop any clips that we may have pushed:
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for (uint32_t i = 0; i < end - 1; ++i) {
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aContext->PopClip();
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}
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}
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already_AddRefed<Path> DisplayItemClip::MakeRoundedRectPath(
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DrawTarget& aDrawTarget, int32_t A2D, const RoundedRect& aRoundRect) const {
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RectCornerRadii pixelRadii;
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nsCSSRendering::ComputePixelRadii(aRoundRect.mRadii, A2D, &pixelRadii);
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Rect rect = NSRectToSnappedRect(aRoundRect.mRect, A2D, aDrawTarget);
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return MakePathForRoundedRect(aDrawTarget, rect, pixelRadii);
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}
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nsRect DisplayItemClip::ApproximateIntersectInward(const nsRect& aRect) const {
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nsRect r = aRect;
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if (mHaveClipRect) {
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r.IntersectRect(r, mClipRect);
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}
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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nsRegion rgn =
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nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, r);
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r = rgn.GetLargestRectangle();
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}
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return r;
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}
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// Test if (aXPoint, aYPoint) is in the ellipse with center (aXCenter, aYCenter)
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// and radii aXRadius, aYRadius.
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static bool IsInsideEllipse(nscoord aXRadius, nscoord aXCenter, nscoord aXPoint,
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nscoord aYRadius, nscoord aYCenter,
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nscoord aYPoint) {
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float scaledX = float(aXPoint - aXCenter) / float(aXRadius);
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float scaledY = float(aYPoint - aYCenter) / float(aYRadius);
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return scaledX * scaledX + scaledY * scaledY < 1.0f;
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}
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bool DisplayItemClip::IsRectClippedByRoundedCorner(const nsRect& aRect) const {
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if (mRoundedClipRects.IsEmpty()) return false;
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nsRect rect;
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rect.IntersectRect(aRect, NonRoundedIntersection());
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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// top left
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if (rect.x < rr.mRect.x + rr.mRadii[eCornerTopLeftX] &&
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rect.y < rr.mRect.y + rr.mRadii[eCornerTopLeftY]) {
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if (!IsInsideEllipse(rr.mRadii[eCornerTopLeftX],
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rr.mRect.x + rr.mRadii[eCornerTopLeftX], rect.x,
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rr.mRadii[eCornerTopLeftY],
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rr.mRect.y + rr.mRadii[eCornerTopLeftY], rect.y)) {
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return true;
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}
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}
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// top right
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if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[eCornerTopRightX] &&
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rect.y < rr.mRect.y + rr.mRadii[eCornerTopRightY]) {
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if (!IsInsideEllipse(rr.mRadii[eCornerTopRightX],
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rr.mRect.XMost() - rr.mRadii[eCornerTopRightX],
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rect.XMost(), rr.mRadii[eCornerTopRightY],
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rr.mRect.y + rr.mRadii[eCornerTopRightY], rect.y)) {
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return true;
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}
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}
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// bottom left
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if (rect.x < rr.mRect.x + rr.mRadii[eCornerBottomLeftX] &&
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rect.YMost() > rr.mRect.YMost() - rr.mRadii[eCornerBottomLeftY]) {
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if (!IsInsideEllipse(rr.mRadii[eCornerBottomLeftX],
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rr.mRect.x + rr.mRadii[eCornerBottomLeftX], rect.x,
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rr.mRadii[eCornerBottomLeftY],
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rr.mRect.YMost() - rr.mRadii[eCornerBottomLeftY],
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rect.YMost())) {
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return true;
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}
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}
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// bottom right
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if (rect.XMost() > rr.mRect.XMost() - rr.mRadii[eCornerBottomRightX] &&
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rect.YMost() > rr.mRect.YMost() - rr.mRadii[eCornerBottomRightY]) {
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if (!IsInsideEllipse(rr.mRadii[eCornerBottomRightX],
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rr.mRect.XMost() - rr.mRadii[eCornerBottomRightX],
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rect.XMost(), rr.mRadii[eCornerBottomRightY],
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rr.mRect.YMost() - rr.mRadii[eCornerBottomRightY],
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rect.YMost())) {
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return true;
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}
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}
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}
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return false;
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}
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nsRect DisplayItemClip::NonRoundedIntersection() const {
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NS_ASSERTION(mHaveClipRect, "Must have a clip rect!");
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nsRect result = mClipRect;
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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result.IntersectRect(result, mRoundedClipRects[i].mRect);
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}
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return result;
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}
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bool DisplayItemClip::IsRectAffectedByClip(const nsRect& aRect) const {
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if (mHaveClipRect && !mClipRect.Contains(aRect)) {
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return true;
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}
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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nsRegion rgn =
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nsLayoutUtils::RoundedRectIntersectRect(rr.mRect, rr.mRadii, aRect);
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if (!rgn.Contains(aRect)) {
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return true;
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}
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}
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return false;
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}
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bool DisplayItemClip::IsRectAffectedByClip(const nsIntRect& aRect,
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float aXScale, float aYScale,
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int32_t A2D) const {
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if (mHaveClipRect) {
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nsIntRect pixelClipRect =
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mClipRect.ScaleToNearestPixels(aXScale, aYScale, A2D);
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if (!pixelClipRect.Contains(aRect)) {
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return true;
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}
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}
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// Rounded rect clipping only snaps to user-space pixels, not device space.
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nsIntRect unscaled = aRect;
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unscaled.Scale(1 / aXScale, 1 / aYScale);
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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const RoundedRect& rr = mRoundedClipRects[i];
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nsIntRect pixelRect = rr.mRect.ToNearestPixels(A2D);
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RectCornerRadii pixelRadii;
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nsCSSRendering::ComputePixelRadii(rr.mRadii, A2D, &pixelRadii);
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nsIntRegion rgn = nsLayoutUtils::RoundedRectIntersectIntRect(
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pixelRect, pixelRadii, unscaled);
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if (!rgn.Contains(unscaled)) {
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return true;
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}
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}
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return false;
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}
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nsRect DisplayItemClip::ApplyNonRoundedIntersection(const nsRect& aRect) const {
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if (!mHaveClipRect) {
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return aRect;
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}
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nsRect result = aRect.Intersect(mClipRect);
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for (uint32_t i = 0, iEnd = mRoundedClipRects.Length(); i < iEnd; ++i) {
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result = result.Intersect(mRoundedClipRects[i].mRect);
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}
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return result;
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}
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void DisplayItemClip::RemoveRoundedCorners() {
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if (mRoundedClipRects.IsEmpty()) return;
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mClipRect = NonRoundedIntersection();
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mRoundedClipRects.Clear();
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}
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// Computes the difference between aR1 and aR2, limited to aBounds.
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static void AccumulateRectDifference(const nsRect& aR1, const nsRect& aR2,
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const nsRect& aBounds, nsRegion* aOut) {
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if (aR1.IsEqualInterior(aR2)) return;
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nsRegion r;
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r.Xor(aR1, aR2);
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r.And(r, aBounds);
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aOut->Or(*aOut, r);
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}
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static void AccumulateRoundedRectDifference(
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const DisplayItemClip::RoundedRect& aR1,
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const DisplayItemClip::RoundedRect& aR2, const nsRect& aBounds,
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const nsRect& aOtherBounds, nsRegion* aOut) {
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const nsRect& rect1 = aR1.mRect;
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const nsRect& rect2 = aR2.mRect;
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// If the two rectangles are totally disjoint, just add them both - otherwise
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// we'd end up adding one big enclosing rect
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if (!rect1.Intersects(rect2) ||
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memcmp(aR1.mRadii, aR2.mRadii, sizeof(aR1.mRadii))) {
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aOut->Or(*aOut, rect1.Intersect(aBounds));
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aOut->Or(*aOut, rect2.Intersect(aOtherBounds));
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return;
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}
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nscoord lowestBottom = std::max(rect1.YMost(), rect2.YMost());
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nscoord highestTop = std::min(rect1.Y(), rect2.Y());
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nscoord maxRight = std::max(rect1.XMost(), rect2.XMost());
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nscoord minLeft = std::min(rect1.X(), rect2.X());
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// At this point, we know that the radii haven't changed, and that the bounds
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// are different in some way. To explain how this works, consider the case
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// where the rounded rect has just been translated along the X direction.
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// | ______________________ _ _ _ _ _ _ |
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// | / / \ \ |
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// | | | |
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// | | aR1 | | aR2 | |
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// | | | |
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// | \ __________\___________ / _ _ _ _ _ / |
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// | |
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// The invalidation region will be as if we lopped off the left rounded part
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// of aR2, and the right rounded part of aR1, and XOR'd them:
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// | ______________________ _ _ _ _ _ _ |
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// | -/-----------/- -\-----------\- |
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// | |-------------- --|------------ |
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// | |-----aR1---|-- --|-----aR2---| |
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// | |-------------- --|------------ |
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// | -\ __________\-__________-/ _ _ _ _ _ /- |
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// | |
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// The logic below just implements this idea, but generalized to both the
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// X and Y dimensions. The "(...)Adjusted(...)" values represent the lopped
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// off sides.
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nscoord highestAdjustedBottom = std::min(
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rect1.YMost() - aR1.mRadii[eCornerBottomLeftY],
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std::min(rect1.YMost() - aR1.mRadii[eCornerBottomRightY],
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std::min(rect2.YMost() - aR2.mRadii[eCornerBottomLeftY],
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rect2.YMost() - aR2.mRadii[eCornerBottomRightY])));
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nscoord lowestAdjustedTop =
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std::max(rect1.Y() + aR1.mRadii[eCornerTopLeftY],
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std::max(rect1.Y() + aR1.mRadii[eCornerTopRightY],
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std::max(rect2.Y() + aR2.mRadii[eCornerTopLeftY],
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rect2.Y() + aR2.mRadii[eCornerTopRightY])));
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nscoord minAdjustedRight = std::min(
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rect1.XMost() - aR1.mRadii[eCornerTopRightX],
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std::min(rect1.XMost() - aR1.mRadii[eCornerBottomRightX],
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std::min(rect2.XMost() - aR2.mRadii[eCornerTopRightX],
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rect2.XMost() - aR2.mRadii[eCornerBottomRightX])));
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nscoord maxAdjustedLeft =
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std::max(rect1.X() + aR1.mRadii[eCornerTopLeftX],
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std::max(rect1.X() + aR1.mRadii[eCornerBottomLeftX],
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std::max(rect2.X() + aR2.mRadii[eCornerTopLeftX],
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rect2.X() + aR2.mRadii[eCornerBottomLeftX])));
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// We only want to add an invalidation rect if the bounds have changed. If we
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// always added all of the 4 rects below, we would always be invalidating a
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// border around the rects, even in cases where we just translated along the X
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// or Y axis.
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nsRegion r;
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// First, or with the Y delta rects, wide along the X axis
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if (rect1.Y() != rect2.Y()) {
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r.Or(r, nsRect(minLeft, highestTop, maxRight - minLeft,
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lowestAdjustedTop - highestTop));
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}
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if (rect1.YMost() != rect2.YMost()) {
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r.Or(r, nsRect(minLeft, highestAdjustedBottom, maxRight - minLeft,
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lowestBottom - highestAdjustedBottom));
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}
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// Then, or with the X delta rects, narrow along the Y axis
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if (rect1.X() != rect2.X()) {
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r.Or(r, nsRect(minLeft, lowestAdjustedTop, maxAdjustedLeft - minLeft,
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highestAdjustedBottom - lowestAdjustedTop));
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}
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if (rect1.XMost() != rect2.XMost()) {
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r.Or(r, nsRect(minAdjustedRight, lowestAdjustedTop,
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maxRight - minAdjustedRight,
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highestAdjustedBottom - lowestAdjustedTop));
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}
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r.And(r, aBounds.Union(aOtherBounds));
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aOut->Or(*aOut, r);
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}
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void DisplayItemClip::AddOffsetAndComputeDifference(
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const nsPoint& aOffset, const nsRect& aBounds,
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const DisplayItemClip& aOther, const nsRect& aOtherBounds,
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nsRegion* aDifference) {
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if (mHaveClipRect != aOther.mHaveClipRect ||
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mRoundedClipRects.Length() != aOther.mRoundedClipRects.Length()) {
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aDifference->Or(*aDifference, aBounds);
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aDifference->Or(*aDifference, aOtherBounds);
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return;
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}
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if (mHaveClipRect) {
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AccumulateRectDifference(mClipRect + aOffset, aOther.mClipRect,
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aBounds.Union(aOtherBounds), aDifference);
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}
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for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
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if (mRoundedClipRects[i] + aOffset != aOther.mRoundedClipRects[i]) {
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AccumulateRoundedRectDifference(mRoundedClipRects[i] + aOffset,
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aOther.mRoundedClipRects[i], aBounds,
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aOtherBounds, aDifference);
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}
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}
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}
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void DisplayItemClip::AppendRoundedRects(nsTArray<RoundedRect>* aArray) const {
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aArray->AppendElements(mRoundedClipRects.Elements(),
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mRoundedClipRects.Length());
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}
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bool DisplayItemClip::ComputeRegionInClips(const DisplayItemClip* aOldClip,
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const nsPoint& aShift,
|
|
nsRegion* aCombined) const {
|
|
if (!mHaveClipRect || (aOldClip && !aOldClip->mHaveClipRect)) {
|
|
return false;
|
|
}
|
|
|
|
if (aOldClip) {
|
|
*aCombined = aOldClip->NonRoundedIntersection();
|
|
aCombined->MoveBy(aShift);
|
|
aCombined->Or(*aCombined, NonRoundedIntersection());
|
|
} else {
|
|
*aCombined = NonRoundedIntersection();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void DisplayItemClip::MoveBy(const nsPoint& aPoint) {
|
|
if (!mHaveClipRect) {
|
|
return;
|
|
}
|
|
mClipRect += aPoint;
|
|
for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
|
|
mRoundedClipRects[i].mRect += aPoint;
|
|
}
|
|
}
|
|
|
|
static DisplayItemClip* gNoClip;
|
|
|
|
const DisplayItemClip& DisplayItemClip::NoClip() {
|
|
if (!gNoClip) {
|
|
gNoClip = new DisplayItemClip();
|
|
}
|
|
return *gNoClip;
|
|
}
|
|
|
|
void DisplayItemClip::Shutdown() {
|
|
delete gNoClip;
|
|
gNoClip = nullptr;
|
|
}
|
|
|
|
nsCString DisplayItemClip::ToString() const {
|
|
nsAutoCString str;
|
|
if (mHaveClipRect) {
|
|
str.AppendPrintf("%d,%d,%d,%d", mClipRect.x, mClipRect.y, mClipRect.width,
|
|
mClipRect.height);
|
|
for (uint32_t i = 0; i < mRoundedClipRects.Length(); ++i) {
|
|
const RoundedRect& r = mRoundedClipRects[i];
|
|
str.AppendPrintf(" [%d,%d,%d,%d corners %d,%d,%d,%d,%d,%d,%d,%d]",
|
|
r.mRect.x, r.mRect.y, r.mRect.width, r.mRect.height,
|
|
r.mRadii[0], r.mRadii[1], r.mRadii[2], r.mRadii[3],
|
|
r.mRadii[4], r.mRadii[5], r.mRadii[6], r.mRadii[7]);
|
|
}
|
|
}
|
|
return std::move(str);
|
|
}
|
|
|
|
void DisplayItemClip::ToComplexClipRegions(
|
|
int32_t aAppUnitsPerDevPixel,
|
|
nsTArray<wr::ComplexClipRegion>& aOutArray) const {
|
|
for (const auto& clipRect : mRoundedClipRects) {
|
|
aOutArray.AppendElement(wr::ToComplexClipRegion(
|
|
clipRect.mRect, clipRect.mRadii, aAppUnitsPerDevPixel));
|
|
}
|
|
}
|
|
|
|
} // namespace mozilla
|