зеркало из https://github.com/mozilla/gecko-dev.git
949 строки
40 KiB
C++
949 строки
40 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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/* utility functions for drawing borders and backgrounds */
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#ifndef nsCSSRendering_h___
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#define nsCSSRendering_h___
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#include "gfxBlur.h"
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#include "gfxContext.h"
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#include "mozilla/gfx/PathHelpers.h"
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#include "mozilla/gfx/Rect.h"
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#include "mozilla/TypedEnumBits.h"
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#include "nsStyleStruct.h"
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#include "nsIFrame.h"
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#include "nsImageRenderer.h"
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#include "nsCSSRenderingBorders.h"
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#include "gfxTextRun.h"
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class gfxContext;
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class nsPresContext;
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namespace mozilla {
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class ComputedStyle;
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namespace gfx {
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struct sRGBColor;
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class DrawTarget;
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} // namespace gfx
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namespace layers {
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class ImageContainer;
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class StackingContextHelper;
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class WebRenderParentCommand;
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class WebRenderLayerManager;
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class RenderRootStateManager;
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} // namespace layers
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namespace wr {
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class DisplayListBuilder;
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} // namespace wr
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enum class PaintBorderFlags : uint8_t { SyncDecodeImages = 1 << 0 };
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(PaintBorderFlags)
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} // namespace mozilla
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/**
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* A struct representing all the information needed to paint a background
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* image to some target, taking into account all CSS background-* properties.
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* See PrepareImageLayer.
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*/
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struct nsBackgroundLayerState {
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typedef mozilla::gfx::CompositionOp CompositionOp;
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typedef mozilla::nsImageRenderer nsImageRenderer;
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/**
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* @param aFlags some combination of nsCSSRendering::PAINTBG_* flags
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*/
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nsBackgroundLayerState(nsIFrame* aForFrame, const mozilla::StyleImage* aImage,
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uint32_t aFlags)
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: mImageRenderer(aForFrame, aImage, aFlags) {}
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/**
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* The nsImageRenderer that will be used to draw the background.
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*/
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nsImageRenderer mImageRenderer;
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/**
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* A rectangle that one copy of the image tile is mapped onto. Same
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* coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareImageLayer.
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*/
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nsRect mDestArea;
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/**
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* The actual rectangle that should be filled with (complete or partial)
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* image tiles. Same coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareImageLayer.
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*/
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nsRect mFillArea;
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/**
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* The anchor point that should be snapped to a pixel corner. Same
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* coordinate system as aBorderArea/aBGClipRect passed into
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* PrepareImageLayer.
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*/
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nsPoint mAnchor;
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/**
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* The background-repeat property space keyword computes the
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* repeat size which is image size plus spacing.
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*/
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nsSize mRepeatSize;
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};
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struct nsCSSRendering {
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typedef mozilla::gfx::sRGBColor sRGBColor;
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typedef mozilla::gfx::CompositionOp CompositionOp;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::Float Float;
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typedef mozilla::gfx::Point Point;
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typedef mozilla::gfx::Rect Rect;
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typedef mozilla::gfx::Size Size;
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typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
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typedef mozilla::layers::WebRenderLayerManager WebRenderLayerManager;
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typedef mozilla::image::ImgDrawResult ImgDrawResult;
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typedef nsIFrame::Sides Sides;
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/**
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* Initialize any static variables used by nsCSSRendering.
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*/
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static void Init();
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/**
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* Clean up any static variables used by nsCSSRendering.
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*/
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static void Shutdown();
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static bool IsBoxDecorationSlice(const nsStyleBorder& aStyleBorder);
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static nsRect BoxDecorationRectForBorder(
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nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
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const nsStyleBorder* aStyleBorder = nullptr);
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static nsRect BoxDecorationRectForBackground(
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nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
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const nsStyleBorder* aStyleBorder = nullptr);
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static bool GetShadowInnerRadii(nsIFrame* aFrame, const nsRect& aFrameArea,
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RectCornerRadii& aOutInnerRadii);
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static nsRect GetBoxShadowInnerPaddingRect(nsIFrame* aFrame,
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const nsRect& aFrameArea);
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static bool ShouldPaintBoxShadowInner(nsIFrame* aFrame);
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static void PaintBoxShadowInner(nsPresContext* aPresContext,
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gfxContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aFrameArea);
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static bool GetBorderRadii(const nsRect& aFrameRect,
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const nsRect& aBorderRect, nsIFrame* aFrame,
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RectCornerRadii& aOutRadii);
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static nsRect GetShadowRect(const nsRect& aFrameArea, bool aNativeTheme,
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nsIFrame* aForFrame);
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static mozilla::gfx::sRGBColor GetShadowColor(
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const mozilla::StyleSimpleShadow&, nsIFrame* aFrame, float aOpacity);
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// Returns if the frame has a themed frame.
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// aMaybeHasBorderRadius will return false if we can early detect
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// that we don't have a border radius.
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static bool HasBoxShadowNativeTheme(nsIFrame* aFrame,
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bool& aMaybeHasBorderRadius);
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static void PaintBoxShadowOuter(nsPresContext* aPresContext,
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gfxContext& aRenderingContext,
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nsIFrame* aForFrame, const nsRect& aFrameArea,
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const nsRect& aDirtyRect,
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float aOpacity = 1.0);
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static void ComputePixelRadii(const nscoord* aAppUnitsRadii,
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nscoord aAppUnitsPerPixel,
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RectCornerRadii* oBorderRadii);
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/**
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* Render the border for an element using css rendering rules
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* for borders. aSkipSides says which sides to skip
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* when rendering, the default is to skip none.
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*/
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static ImgDrawResult PaintBorder(
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nsPresContext* aPresContext, gfxContext& aRenderingContext,
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nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
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mozilla::ComputedStyle* aStyle, mozilla::PaintBorderFlags aFlags,
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Sides aSkipSides = Sides());
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/**
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* Like PaintBorder, but taking an nsStyleBorder argument instead of
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* getting it from aStyle. aSkipSides says which sides to skip
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* when rendering, the default is to skip none.
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*/
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static ImgDrawResult PaintBorderWithStyleBorder(
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nsPresContext* aPresContext, gfxContext& aRenderingContext,
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nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
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const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
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mozilla::PaintBorderFlags aFlags, Sides aSkipSides = Sides());
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static mozilla::Maybe<nsCSSBorderRenderer> CreateBorderRenderer(
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nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
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const nsRect& aDirtyRect, const nsRect& aBorderArea,
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mozilla::ComputedStyle* aStyle, bool* aOutBorderIsEmpty,
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Sides aSkipSides = Sides());
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static mozilla::Maybe<nsCSSBorderRenderer>
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CreateBorderRendererWithStyleBorder(
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nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
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const nsRect& aDirtyRect, const nsRect& aBorderArea,
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const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
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bool* aOutBorderIsEmpty, Sides aSkipSides = Sides());
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static mozilla::Maybe<nsCSSBorderRenderer>
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CreateNullBorderRendererWithStyleBorder(
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nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
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const nsRect& aDirtyRect, const nsRect& aBorderArea,
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const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
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bool* aOutBorderIsEmpty, Sides aSkipSides = Sides());
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static mozilla::Maybe<nsCSSBorderRenderer>
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CreateBorderRendererForNonThemedOutline(nsPresContext* aPresContext,
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DrawTarget* aDrawTarget,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aInnerRect,
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mozilla::ComputedStyle* aStyle);
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static ImgDrawResult CreateWebRenderCommandsForBorder(
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mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
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const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
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mozilla::wr::IpcResourceUpdateQueue& aResources,
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const mozilla::layers::StackingContextHelper& aSc,
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mozilla::layers::RenderRootStateManager* aManager,
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mozilla::nsDisplayListBuilder* aDisplayListBuilder);
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static void CreateWebRenderCommandsForNullBorder(
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mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
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const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
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mozilla::wr::IpcResourceUpdateQueue& aResources,
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const mozilla::layers::StackingContextHelper& aSc,
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const nsStyleBorder& aStyleBorder);
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static ImgDrawResult CreateWebRenderCommandsForBorderWithStyleBorder(
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mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
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const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
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mozilla::wr::IpcResourceUpdateQueue& aResources,
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const mozilla::layers::StackingContextHelper& aSc,
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mozilla::layers::RenderRootStateManager* aManager,
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mozilla::nsDisplayListBuilder* aDisplayListBuilder,
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const nsStyleBorder& aStyleBorder);
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/**
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* Render the outline for an element using css rendering rules for borders.
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*/
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static void PaintNonThemedOutline(nsPresContext* aPresContext,
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gfxContext& aRenderingContext,
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nsIFrame* aForFrame,
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const nsRect& aDirtyRect,
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const nsRect& aInnerRect,
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mozilla::ComputedStyle* aStyle);
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/**
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* Render keyboard focus on an element.
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* |aFocusRect| is the outer rectangle of the focused element.
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* Uses a fixed style equivalent to "1px dotted |aColor|".
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* Not used for controls, because the native theme may differ.
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*/
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static void PaintFocus(nsPresContext* aPresContext, DrawTarget* aDrawTarget,
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const nsRect& aFocusRect, nscolor aColor);
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/**
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* Render a gradient for an element.
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* aDest is the rect for a single tile of the gradient on the destination.
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* aFill is the rect on the destination to be covered by repeated tiling of
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* the gradient.
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* aSrc is the part of the gradient to be rendered into a tile (aDest), if
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* aSrc and aDest are different sizes, the image will be scaled to map aSrc
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* onto aDest.
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* aIntrinsicSize is the size of the source gradient.
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*/
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static void PaintGradient(nsPresContext* aPresContext, gfxContext& aContext,
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const mozilla::StyleGradient& aGradient,
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const nsRect& aDirtyRect, const nsRect& aDest,
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const nsRect& aFill, const nsSize& aRepeatSize,
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const mozilla::CSSIntRect& aSrc,
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const nsSize& aIntrinsiceSize,
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float aOpacity = 1.0);
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/**
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* Find the frame whose background style should be used to draw the
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* canvas background. aForFrame must be the frame for the root element
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* whose background style should be used. This function will return
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* aForFrame unless the <body> background should be propagated, in
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* which case we return the frame associated with the <body>'s background.
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*/
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static nsIFrame* FindBackgroundStyleFrame(nsIFrame* aForFrame);
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/**
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* @return true if |aFrame| is a canvas frame, in the CSS sense.
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*/
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static bool IsCanvasFrame(const nsIFrame* aFrame);
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/**
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* Fill in an aBackgroundSC to be used to paint the background
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* for an element. This applies the rules for propagating
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* backgrounds between BODY, the root element, and the canvas.
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* @return true if there is some meaningful background.
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*/
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static bool FindBackground(const nsIFrame* aForFrame,
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mozilla::ComputedStyle** aBackgroundSC);
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static bool FindBackgroundFrame(const nsIFrame* aForFrame,
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nsIFrame** aBackgroundFrame);
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/**
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* As FindBackground, but the passed-in frame is known to be a root frame
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* (returned from nsCSSFrameConstructor::GetRootElementStyleFrame())
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* and there is always some meaningful background returned.
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*/
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static mozilla::ComputedStyle* FindRootFrameBackground(nsIFrame* aForFrame);
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/**
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* Returns background style information for the canvas.
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*
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* @param aForFrame
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* the frame used to represent the canvas, in the CSS sense (i.e.
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* nsCSSRendering::IsCanvasFrame(aForFrame) must be true)
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* @param aRootElementFrame
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* the frame representing the root element of the document
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* @param aBackground
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* contains background style information for the canvas on return
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*/
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static nsIFrame* FindCanvasBackgroundFrame(const nsIFrame* aForFrame,
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nsIFrame* aRootElementFrame) {
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MOZ_ASSERT(IsCanvasFrame(aForFrame), "not a canvas frame");
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if (aRootElementFrame) {
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return FindBackgroundStyleFrame(aRootElementFrame);
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}
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// This should always give transparent, so we'll fill it in with the
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// default color if needed. This seems to happen a bit while a page is
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// being loaded.
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return const_cast<nsIFrame*>(aForFrame);
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}
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static mozilla::ComputedStyle* FindCanvasBackground(
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nsIFrame* aForFrame, nsIFrame* aRootElementFrame) {
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return FindCanvasBackgroundFrame(aForFrame, aRootElementFrame)->Style();
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}
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/**
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* Find a frame which draws a non-transparent background, for various contrast
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* checks. Note that this only accounts for background-color and might stop at
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* themed frames (depending on the argument), so it might not be what you
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* want.
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*/
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struct NonTransparentBackgroundFrame {
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nsIFrame* mFrame = nullptr;
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bool mIsThemed = false;
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bool mIsForCanvas = false;
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};
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static NonTransparentBackgroundFrame FindNonTransparentBackgroundFrame(
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nsIFrame* aFrame, bool aStopAtThemed = true);
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/**
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* Determine the background color to draw taking into account print settings.
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*/
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static nscolor DetermineBackgroundColor(nsPresContext* aPresContext,
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mozilla::ComputedStyle* aStyle,
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nsIFrame* aFrame,
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bool& aDrawBackgroundImage,
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bool& aDrawBackgroundColor);
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static nsRect ComputeImageLayerPositioningArea(
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nsPresContext* aPresContext, nsIFrame* aForFrame,
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const nsRect& aBorderArea, const nsStyleImageLayers::Layer& aLayer,
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nsIFrame** aAttachedToFrame, bool* aOutTransformedFixed);
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// Implementation of the formula for computation of background-repeat round
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// See http://dev.w3.org/csswg/css3-background/#the-background-size
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// This function returns the adjusted size of the background image.
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static nscoord ComputeRoundedSize(nscoord aCurrentSize,
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nscoord aPositioningSize);
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/* ComputeBorderSpacedRepeatSize
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* aImageDimension: the image width/height
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* aAvailableSpace: the background positioning area width/height
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* aSpace: the space between each image
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* Returns the image size plus gap size of app units for use as spacing
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*/
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static nscoord ComputeBorderSpacedRepeatSize(nscoord aImageDimension,
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nscoord aAvailableSpace,
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nscoord& aSpace);
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static nsBackgroundLayerState PrepareImageLayer(
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nsPresContext* aPresContext, nsIFrame* aForFrame, uint32_t aFlags,
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const nsRect& aBorderArea, const nsRect& aBGClipRect,
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const nsStyleImageLayers::Layer& aLayer,
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bool* aOutIsTransformedFixed = nullptr);
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struct ImageLayerClipState {
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nsRect mBGClipArea; // Affected by mClippedRadii
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nsRect mAdditionalBGClipArea; // Not affected by mClippedRadii
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nsRect mDirtyRectInAppUnits;
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gfxRect mDirtyRectInDevPx;
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nscoord mRadii[8];
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RectCornerRadii mClippedRadii;
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bool mHasRoundedCorners;
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bool mHasAdditionalBGClipArea;
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// Whether we are being asked to draw with a caller provided background
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// clipping area. If this is true we also disable rounded corners.
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bool mCustomClip;
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ImageLayerClipState()
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: mHasRoundedCorners(false),
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mHasAdditionalBGClipArea(false),
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mCustomClip(false) {
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memset(mRadii, 0, sizeof(nscoord) * 8);
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}
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bool IsValid() const;
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};
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static void GetImageLayerClip(const nsStyleImageLayers::Layer& aLayer,
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nsIFrame* aForFrame,
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const nsStyleBorder& aBorder,
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const nsRect& aBorderArea,
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const nsRect& aCallerDirtyRect,
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bool aWillPaintBorder,
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nscoord aAppUnitsPerPixel,
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/* out */ ImageLayerClipState* aClipState);
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/**
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* Render the background for an element using css rendering rules
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* for backgrounds or mask.
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*/
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enum {
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/**
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* When this flag is passed, the element's nsDisplayBorder will be
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* painted immediately on top of this background.
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*/
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PAINTBG_WILL_PAINT_BORDER = 0x01,
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/**
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* When this flag is passed, images are synchronously decoded.
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*/
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PAINTBG_SYNC_DECODE_IMAGES = 0x02,
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/**
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* When this flag is passed, painting will go to the screen so we can
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* take advantage of the fact that it will be clipped to the viewport.
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*/
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PAINTBG_TO_WINDOW = 0x04,
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/**
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* When this flag is passed, painting will read properties of mask-image
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* style, instead of background-image.
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*/
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PAINTBG_MASK_IMAGE = 0x08,
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/**
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* When this flag is passed, images are downscaled during decode. This
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* is also implied by PAINTBG_TO_WINDOW.
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*/
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PAINTBG_HIGH_QUALITY_SCALING = 0x16,
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};
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struct PaintBGParams {
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nsPresContext& presCtx;
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nsRect dirtyRect;
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nsRect borderArea;
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nsIFrame* frame;
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uint32_t paintFlags;
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nsRect* bgClipRect = nullptr;
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int32_t layer; // -1 means painting all layers; other
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// value means painting one specific
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// layer only.
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CompositionOp compositionOp;
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float opacity;
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static PaintBGParams ForAllLayers(nsPresContext& aPresCtx,
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const nsRect& aDirtyRect,
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const nsRect& aBorderArea,
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nsIFrame* aFrame, uint32_t aPaintFlags,
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float aOpacity = 1.0);
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static PaintBGParams ForSingleLayer(
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nsPresContext& aPresCtx, const nsRect& aDirtyRect,
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const nsRect& aBorderArea, nsIFrame* aFrame, uint32_t aPaintFlags,
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int32_t aLayer, CompositionOp aCompositionOp = CompositionOp::OP_OVER,
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float aOpacity = 1.0);
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private:
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PaintBGParams(nsPresContext& aPresCtx, const nsRect& aDirtyRect,
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const nsRect& aBorderArea, nsIFrame* aFrame,
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uint32_t aPaintFlags, int32_t aLayer,
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CompositionOp aCompositionOp, float aOpacity)
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: presCtx(aPresCtx),
|
|
dirtyRect(aDirtyRect),
|
|
borderArea(aBorderArea),
|
|
frame(aFrame),
|
|
paintFlags(aPaintFlags),
|
|
layer(aLayer),
|
|
compositionOp(aCompositionOp),
|
|
opacity(aOpacity) {}
|
|
};
|
|
|
|
static ImgDrawResult PaintStyleImageLayer(const PaintBGParams& aParams,
|
|
gfxContext& aRenderingCtx);
|
|
|
|
/**
|
|
* Same as |PaintStyleImageLayer|, except using the provided style structs.
|
|
* This short-circuits the code that ensures that the root element's
|
|
* {background|mask} is drawn on the canvas.
|
|
* The aLayer parameter allows you to paint a single layer of the
|
|
* {background|mask}.
|
|
* The default value for aLayer, -1, means that all layers will be painted.
|
|
* The background color will only be painted if the back-most layer is also
|
|
* being painted and (aParams.paintFlags & PAINTBG_MASK_IMAGE) is false.
|
|
* aCompositionOp is only respected if a single layer is specified (aLayer !=
|
|
* -1). If all layers are painted, the image layer's blend mode (or the mask
|
|
* layer's composition mode) will be used.
|
|
*/
|
|
static ImgDrawResult PaintStyleImageLayerWithSC(
|
|
const PaintBGParams& aParams, gfxContext& aRenderingCtx,
|
|
mozilla::ComputedStyle* mBackgroundSC, const nsStyleBorder& aBorder);
|
|
|
|
static bool CanBuildWebRenderDisplayItemsForStyleImageLayer(
|
|
WebRenderLayerManager* aManager, nsPresContext& aPresCtx,
|
|
nsIFrame* aFrame, const nsStyleBackground* aBackgroundStyle,
|
|
int32_t aLayer, uint32_t aPaintFlags);
|
|
static ImgDrawResult BuildWebRenderDisplayItemsForStyleImageLayer(
|
|
const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
|
|
mozilla::wr::IpcResourceUpdateQueue& aResources,
|
|
const mozilla::layers::StackingContextHelper& aSc,
|
|
mozilla::layers::RenderRootStateManager* aManager,
|
|
mozilla::nsDisplayItem* aItem);
|
|
|
|
static ImgDrawResult BuildWebRenderDisplayItemsForStyleImageLayerWithSC(
|
|
const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
|
|
mozilla::wr::IpcResourceUpdateQueue& aResources,
|
|
const mozilla::layers::StackingContextHelper& aSc,
|
|
mozilla::layers::RenderRootStateManager* aManager,
|
|
mozilla::nsDisplayItem* aItem, mozilla::ComputedStyle* mBackgroundSC,
|
|
const nsStyleBorder& aBorder);
|
|
|
|
/**
|
|
* Returns the rectangle covered by the given background layer image, taking
|
|
* into account background positioning, sizing, and repetition, but not
|
|
* clipping.
|
|
*/
|
|
static nsRect GetBackgroundLayerRect(nsPresContext* aPresContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aBorderArea,
|
|
const nsRect& aClipRect,
|
|
const nsStyleImageLayers::Layer& aLayer,
|
|
uint32_t aFlags);
|
|
|
|
/**
|
|
* Called when we start creating a display list. The frame tree will not
|
|
* change until a matching EndFrameTreeLocked is called.
|
|
*/
|
|
static void BeginFrameTreesLocked();
|
|
/**
|
|
* Called when we've finished using a display list. When all
|
|
* BeginFrameTreeLocked calls have been balanced by an EndFrameTreeLocked,
|
|
* the frame tree may start changing again.
|
|
*/
|
|
static void EndFrameTreesLocked();
|
|
|
|
// Draw a border segment in the table collapsing border model with beveling
|
|
// corners.
|
|
static void DrawTableBorderSegment(
|
|
DrawTarget& aDrawTarget, mozilla::StyleBorderStyle aBorderStyle,
|
|
nscolor aBorderColor, const nsRect& aBorderRect,
|
|
int32_t aAppUnitsPerDevPixel, mozilla::Side aStartBevelSide,
|
|
nscoord aStartBevelOffset, mozilla::Side aEndBevelSide,
|
|
nscoord aEndBevelOffset);
|
|
|
|
// A single border bevel.
|
|
struct Bevel {
|
|
mozilla::Side mSide;
|
|
nscoord mOffset;
|
|
};
|
|
|
|
// A single solid beveled border segment.
|
|
struct SolidBeveledBorderSegment {
|
|
nsRect mRect;
|
|
nscolor mColor;
|
|
Bevel mStartBevel;
|
|
Bevel mEndBevel;
|
|
};
|
|
|
|
// Collect the table border segments with beveling. Can't be called with
|
|
// dashed / dotted borders, since we don't support beveling those.
|
|
static void GetTableBorderSolidSegments(
|
|
nsTArray<SolidBeveledBorderSegment>& aSegments,
|
|
mozilla::StyleBorderStyle aBorderStyle, nscolor aBorderColor,
|
|
const nsRect& aBorderRect, int32_t aAppUnitsPerDevPixel,
|
|
mozilla::Side aStartBevelSide, nscoord aStartBevelOffset,
|
|
mozilla::Side aEndBevelSide, nscoord aEndBevelOffset);
|
|
|
|
// NOTE: pt, dirtyRect, lineSize, ascent, offset in the following
|
|
// structs are non-rounded device pixels, not app units.
|
|
struct DecorationRectParams {
|
|
// The width [length] and the height [thickness] of the decoration
|
|
// line. This is a "logical" size in textRun orientation, so that
|
|
// for a vertical textrun, width will actually be a physical height;
|
|
// and conversely, height will be a physical width.
|
|
Size lineSize;
|
|
// The default height [thickness] of the line given by the font metrics.
|
|
// This is used for obtaining the correct offset for the decoration line
|
|
// when CSS specifies a unique thickness for a text-decoration,
|
|
// since the offset given by the font is derived from the font metric's
|
|
// assumed line height
|
|
Float defaultLineThickness = 0.0f;
|
|
// The ascent of the text.
|
|
Float ascent = 0.0f;
|
|
// The offset of the decoration line from the baseline of the text
|
|
// (if the value is positive, the line is lifted up).
|
|
Float offset = 0.0f;
|
|
// If descentLimit is zero or larger and the underline overflows
|
|
// from the descent space, the underline should be lifted up as far
|
|
// as possible. Note that this does not mean the underline never
|
|
// overflows from this limitation, because if the underline is
|
|
// positioned to the baseline or upper, it causes unreadability.
|
|
// Note that if this is zero or larger, the underline rect may be
|
|
// shrunken if it's possible. Therefore, this value is used for
|
|
// strikeout line and overline too.
|
|
Float descentLimit = -1.0f;
|
|
// Which line will be painted. The value can be
|
|
// UNDERLINE or OVERLINE or LINE_THROUGH.
|
|
mozilla::StyleTextDecorationLine decoration =
|
|
mozilla::StyleTextDecorationLine::UNDERLINE;
|
|
// The style of the decoration line such as
|
|
// NS_STYLE_TEXT_DECORATION_STYLE_*.
|
|
uint8_t style = NS_STYLE_TEXT_DECORATION_STYLE_NONE;
|
|
bool vertical = false;
|
|
bool sidewaysLeft = false;
|
|
gfxTextRun::Range glyphRange;
|
|
gfxTextRun::PropertyProvider* provider;
|
|
};
|
|
|
|
struct PaintDecorationLineParams : DecorationRectParams {
|
|
// No need to paint outside this rect.
|
|
Rect dirtyRect;
|
|
// The top/left edge of the text.
|
|
Point pt;
|
|
// The color of the decoration line.
|
|
nscolor color = NS_RGBA(0, 0, 0, 0);
|
|
// The distance between the left edge of the given frame and the
|
|
// position of the text as positioned without offset of the shadow.
|
|
Float icoordInFrame = 0.0f;
|
|
// Baseline offset being applied to this text (block-direction adjustment
|
|
// applied to glyph positions when computing skip-ink intercepts).
|
|
Float baselineOffset = 0.0f;
|
|
};
|
|
|
|
/**
|
|
* Function for painting the clipped decoration lines for the text.
|
|
* Takes into account the rect clipping that occurs when
|
|
* text-decoration-skip-ink is being used for underlines or overlines
|
|
*
|
|
* input:
|
|
* @param aFrame the frame which needs the decoration line
|
|
* @param aDrawTarget the target/backend being drawn to
|
|
* @param aParams the parameters for the decoration line
|
|
* being drawn
|
|
* @param aRect the rect representing the decoration line
|
|
*/
|
|
static void PaintDecorationLineInternal(
|
|
nsIFrame* aFrame, DrawTarget& aDrawTarget,
|
|
const PaintDecorationLineParams& aParams, Rect aRect);
|
|
|
|
/**
|
|
* Function for painting the decoration lines for the text.
|
|
*
|
|
* input:
|
|
* @param aFrame the frame which needs the decoration line
|
|
* @param aDrawTarget the target/backend being drawn to
|
|
* @param aParams the parameters for the decoration line
|
|
* being drawn
|
|
*/
|
|
static void PaintDecorationLine(nsIFrame* aFrame, DrawTarget& aDrawTarget,
|
|
const PaintDecorationLineParams& aParams);
|
|
|
|
/**
|
|
* Returns a Rect corresponding to the outline of the decoration line for the
|
|
* given text metrics. Arguments have the same meaning as for
|
|
* PaintDecorationLine. Currently this only works for solid
|
|
* decorations; for other decoration styles the returned Rect will be empty.
|
|
*/
|
|
static Rect DecorationLineToPath(const PaintDecorationLineParams& aParams);
|
|
|
|
/**
|
|
* Function for getting the decoration line rect for the text.
|
|
* NOTE: aLineSize, aAscent and aOffset are non-rounded device pixels,
|
|
* not app units.
|
|
* input:
|
|
* @param aPresContext
|
|
* output:
|
|
* @return the decoration line rect for the input,
|
|
* the each values are app units.
|
|
*/
|
|
static nsRect GetTextDecorationRect(nsPresContext* aPresContext,
|
|
const DecorationRectParams& aParams);
|
|
|
|
static CompositionOp GetGFXBlendMode(mozilla::StyleBlend aBlendMode) {
|
|
switch (aBlendMode) {
|
|
case mozilla::StyleBlend::Normal:
|
|
return CompositionOp::OP_OVER;
|
|
case mozilla::StyleBlend::Multiply:
|
|
return CompositionOp::OP_MULTIPLY;
|
|
case mozilla::StyleBlend::Screen:
|
|
return CompositionOp::OP_SCREEN;
|
|
case mozilla::StyleBlend::Overlay:
|
|
return CompositionOp::OP_OVERLAY;
|
|
case mozilla::StyleBlend::Darken:
|
|
return CompositionOp::OP_DARKEN;
|
|
case mozilla::StyleBlend::Lighten:
|
|
return CompositionOp::OP_LIGHTEN;
|
|
case mozilla::StyleBlend::ColorDodge:
|
|
return CompositionOp::OP_COLOR_DODGE;
|
|
case mozilla::StyleBlend::ColorBurn:
|
|
return CompositionOp::OP_COLOR_BURN;
|
|
case mozilla::StyleBlend::HardLight:
|
|
return CompositionOp::OP_HARD_LIGHT;
|
|
case mozilla::StyleBlend::SoftLight:
|
|
return CompositionOp::OP_SOFT_LIGHT;
|
|
case mozilla::StyleBlend::Difference:
|
|
return CompositionOp::OP_DIFFERENCE;
|
|
case mozilla::StyleBlend::Exclusion:
|
|
return CompositionOp::OP_EXCLUSION;
|
|
case mozilla::StyleBlend::Hue:
|
|
return CompositionOp::OP_HUE;
|
|
case mozilla::StyleBlend::Saturation:
|
|
return CompositionOp::OP_SATURATION;
|
|
case mozilla::StyleBlend::Color:
|
|
return CompositionOp::OP_COLOR;
|
|
case mozilla::StyleBlend::Luminosity:
|
|
return CompositionOp::OP_LUMINOSITY;
|
|
case mozilla::StyleBlend::PlusLighter:
|
|
return CompositionOp::OP_ADD;
|
|
default:
|
|
MOZ_ASSERT(false);
|
|
return CompositionOp::OP_OVER;
|
|
}
|
|
}
|
|
|
|
static CompositionOp GetGFXCompositeMode(
|
|
mozilla::StyleMaskComposite aCompositeMode) {
|
|
switch (aCompositeMode) {
|
|
case mozilla::StyleMaskComposite::Add:
|
|
return CompositionOp::OP_OVER;
|
|
case mozilla::StyleMaskComposite::Subtract:
|
|
return CompositionOp::OP_OUT;
|
|
case mozilla::StyleMaskComposite::Intersect:
|
|
return CompositionOp::OP_IN;
|
|
case mozilla::StyleMaskComposite::Exclude:
|
|
return CompositionOp::OP_XOR;
|
|
default:
|
|
MOZ_ASSERT(false);
|
|
return CompositionOp::OP_OVER;
|
|
}
|
|
}
|
|
|
|
protected:
|
|
static gfxRect GetTextDecorationRectInternal(
|
|
const Point& aPt, const DecorationRectParams& aParams);
|
|
|
|
/**
|
|
* Returns inflated rect for painting a decoration line.
|
|
* Complex style decoration lines should be painted from leftmost of nearest
|
|
* ancestor block box because that makes better look of connection of lines
|
|
* for different nodes. ExpandPaintingRectForDecorationLine() returns
|
|
* a rect for actual painting rect for the clipped rect.
|
|
*
|
|
* input:
|
|
* @param aFrame the frame which needs the decoration line.
|
|
* @param aStyle the style of the complex decoration line
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_DOTTED or
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_DASHED or
|
|
* NS_STYLE_TEXT_DECORATION_STYLE_WAVY.
|
|
* @param aClippedRect the clipped rect for the decoration line.
|
|
* in other words, visible area of the line.
|
|
* @param aICoordInFrame the distance between inline-start edge of aFrame
|
|
* and aClippedRect.pos.
|
|
* @param aCycleLength the width of one cycle of the line style.
|
|
*/
|
|
static Rect ExpandPaintingRectForDecorationLine(
|
|
nsIFrame* aFrame, const uint8_t aStyle, const Rect& aClippedRect,
|
|
const Float aICoordInFrame, const Float aCycleLength, bool aVertical);
|
|
};
|
|
|
|
/*
|
|
* nsContextBoxBlur
|
|
* Creates an 8-bit alpha channel context for callers to draw in, blurs the
|
|
* contents of that context and applies it as a 1-color mask on a
|
|
* different existing context. Uses gfxAlphaBoxBlur as its back end.
|
|
*
|
|
* You must call Init() first to create a suitable temporary surface to draw
|
|
* on. You must then draw any desired content onto the given context, then
|
|
* call DoPaint() to apply the blurred content as a single-color mask. You
|
|
* can only call Init() once, so objects cannot be reused.
|
|
*
|
|
* This is very useful for creating drop shadows or silhouettes.
|
|
*/
|
|
class nsContextBoxBlur {
|
|
typedef mozilla::gfx::sRGBColor sRGBColor;
|
|
typedef mozilla::gfx::DrawTarget DrawTarget;
|
|
typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
|
|
|
|
public:
|
|
enum { FORCE_MASK = 0x01, DISABLE_HARDWARE_ACCELERATION_BLUR = 0x02 };
|
|
/**
|
|
* Prepares a gfxContext to draw on. Do not call this twice; if you want
|
|
* to get the gfxContext again use GetContext().
|
|
*
|
|
* @param aRect The coordinates of the surface to create.
|
|
* All coordinates must be in app units.
|
|
* This must not include the blur radius, pass
|
|
* it as the second parameter and everything
|
|
* is taken care of.
|
|
*
|
|
* @param aBlurRadius The blur radius in app units.
|
|
*
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
*
|
|
* @param aDestinationCtx The graphics context to apply the blurred
|
|
* mask to when you call DoPaint(). Make sure
|
|
* it is not destroyed before you call
|
|
* DoPaint(). To set the color of the
|
|
* resulting blurred graphic mask, you must
|
|
* set the color on this context before
|
|
* calling Init().
|
|
*
|
|
* @param aDirtyRect The absolute dirty rect in app units. Used to
|
|
* optimize the temporary surface size and speed
|
|
* up blur.
|
|
*
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to
|
|
* avoid blurring over, to prevent unnecessary work.
|
|
*
|
|
* @param aFlags FORCE_MASK to ensure that the content drawn to
|
|
* the returned gfxContext is used as a mask, and not drawn directly to
|
|
* aDestinationCtx.
|
|
*
|
|
* @return A blank 8-bit alpha-channel-only graphics context to
|
|
* draw on, or null on error. Must not be freed. The
|
|
* context has a device offset applied to it given by
|
|
* aRect. This means you can use coordinates as if it
|
|
* were at the desired position at aRect and you don't
|
|
* need to worry about translating any coordinates to
|
|
* draw on this temporary surface.
|
|
*
|
|
* If aBlurRadius is 0, the returned context is aDestinationCtx and
|
|
* DoPaint() does nothing, because no blurring is required. Therefore, you
|
|
* should prepare the destination context as if you were going to draw
|
|
* directly on it instead of any temporary surface created in this class.
|
|
*/
|
|
gfxContext* Init(const nsRect& aRect, nscoord aSpreadRadius,
|
|
nscoord aBlurRadius, int32_t aAppUnitsPerDevPixel,
|
|
gfxContext* aDestinationCtx, const nsRect& aDirtyRect,
|
|
const gfxRect* aSkipRect, uint32_t aFlags = 0);
|
|
|
|
/**
|
|
* Does the actual blurring and mask applying. Users of this object *must*
|
|
* have called Init() first, then have drawn whatever they want to be
|
|
* blurred onto the internal gfxContext before calling this.
|
|
*/
|
|
void DoPaint();
|
|
|
|
/**
|
|
* Gets the internal gfxContext at any time. Must not be freed. Avoid
|
|
* calling this before calling Init() since the context would not be
|
|
* constructed at that point.
|
|
*/
|
|
gfxContext* GetContext();
|
|
|
|
/**
|
|
* Get the margin associated with the given blur radius, i.e., the
|
|
* additional area that might be painted as a result of it. (The
|
|
* margin for a spread radius is itself, on all sides.)
|
|
*/
|
|
static nsMargin GetBlurRadiusMargin(nscoord aBlurRadius,
|
|
int32_t aAppUnitsPerDevPixel);
|
|
|
|
/**
|
|
* Blurs a coloured rectangle onto aDestinationCtx. This is equivalent
|
|
* to calling Init(), drawing a rectangle onto the returned surface
|
|
* and then calling DoPaint, but may let us optimize better in the
|
|
* backend.
|
|
*
|
|
* @param aDestinationCtx The destination to blur to.
|
|
* @param aRect The rectangle to blur in app units.
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
* @param aCornerRadii Corner radii for aRect, if it is a rounded
|
|
* rectangle.
|
|
* @param aBlurRadius The blur radius in app units.
|
|
* @param aShadowColor The color to draw the blurred shadow.
|
|
* @param aDirtyRect The absolute dirty rect in app units. Used to
|
|
* optimize the temporary surface size and speed
|
|
* up blur.
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to
|
|
* avoid blurring over, to prevent unnecessary work.
|
|
*/
|
|
static void BlurRectangle(gfxContext* aDestinationCtx, const nsRect& aRect,
|
|
int32_t aAppUnitsPerDevPixel,
|
|
RectCornerRadii* aCornerRadii, nscoord aBlurRadius,
|
|
const sRGBColor& aShadowColor,
|
|
const nsRect& aDirtyRect, const gfxRect& aSkipRect);
|
|
|
|
/**
|
|
* Draws a blurred inset box shadow shape onto the destination surface.
|
|
* Like BlurRectangle, this is equivalent to calling Init(),
|
|
* drawing a rectangle onto the returned surface
|
|
* and then calling DoPaint, but may let us optimize better in the
|
|
* backend.
|
|
*
|
|
* @param aDestinationCtx The destination to blur to.
|
|
* @param aDestinationRect The rectangle to blur in app units.
|
|
* @param aShadowClipRect The inside clip rect that creates the path.
|
|
* @param aShadowColor The color of the blur
|
|
* @param aBlurRadiusAppUnits The blur radius in app units
|
|
* @param aSpreadRadiusAppUnits The spread radius in app units.
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
* @param aHasBorderRadius If this inset box blur has a border radius
|
|
* @param aInnerClipRectRadii The clip rect radii used for the inside rect's
|
|
* path.
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to
|
|
* avoid blurring over, to prevent unnecessary work.
|
|
*/
|
|
bool InsetBoxBlur(gfxContext* aDestinationCtx,
|
|
mozilla::gfx::Rect aDestinationRect,
|
|
mozilla::gfx::Rect aShadowClipRect,
|
|
mozilla::gfx::sRGBColor& aShadowColor,
|
|
nscoord aBlurRadiusAppUnits, nscoord aSpreadRadiusAppUnits,
|
|
int32_t aAppUnitsPerDevPixel, bool aHasBorderRadius,
|
|
RectCornerRadii& aInnerClipRectRadii,
|
|
mozilla::gfx::Rect aSkipRect,
|
|
mozilla::gfx::Point aShadowOffset);
|
|
|
|
protected:
|
|
static void GetBlurAndSpreadRadius(DrawTarget* aDestDrawTarget,
|
|
int32_t aAppUnitsPerDevPixel,
|
|
nscoord aBlurRadius, nscoord aSpreadRadius,
|
|
mozilla::gfx::IntSize& aOutBlurRadius,
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mozilla::gfx::IntSize& aOutSpreadRadius,
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bool aConstrainSpreadRadius = true);
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gfxAlphaBoxBlur mAlphaBoxBlur;
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RefPtr<gfxContext> mContext;
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gfxContext* mDestinationCtx;
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/* This is true if the blur already has it's content transformed
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* by mDestinationCtx's transform */
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bool mPreTransformed;
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};
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#endif /* nsCSSRendering_h___ */
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