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Diffstat (limited to 'layout/svg/SVGGradientFrame.h')
| -rw-r--r-- | layout/svg/SVGGradientFrame.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/layout/svg/SVGGradientFrame.h b/layout/svg/SVGGradientFrame.h new file mode 100644 index 0000000000..323ee4c2ad --- /dev/null +++ b/layout/svg/SVGGradientFrame.h @@ -0,0 +1,203 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef LAYOUT_SVG_SVGGRADIENTFRAME_H_ +#define LAYOUT_SVG_SVGGRADIENTFRAME_H_ + +#include "mozilla/Attributes.h" +#include "mozilla/SVGPaintServerFrame.h" +#include "gfxMatrix.h" +#include "gfxRect.h" +#include "nsCOMPtr.h" +#include "nsCSSRenderingGradients.h" +#include "nsIFrame.h" +#include "nsLiteralString.h" + +class gfxPattern; +class nsAtom; +class nsIContent; + +namespace mozilla { +class PresShell; +class SVGAnimatedTransformList; + +namespace dom { +class SVGLinearGradientElement; +class SVGRadialGradientElement; +} // namespace dom +} // namespace mozilla + +nsIFrame* NS_NewSVGLinearGradientFrame(mozilla::PresShell* aPresShell, + mozilla::ComputedStyle* aStyle); +nsIFrame* NS_NewSVGRadialGradientFrame(mozilla::PresShell* aPresShell, + mozilla::ComputedStyle* aStyle); + +namespace mozilla { + +class SVGGradientFrame : public SVGPaintServerFrame { + using ExtendMode = gfx::ExtendMode; + + protected: + SVGGradientFrame(ComputedStyle* aStyle, nsPresContext* aPresContext, + ClassID aID); + + public: + NS_DECL_ABSTRACT_FRAME(SVGGradientFrame) + NS_DECL_QUERYFRAME + NS_DECL_QUERYFRAME_TARGET(SVGGradientFrame) + + // SVGPaintServerFrame methods: + already_AddRefed<gfxPattern> GetPaintServerPattern( + nsIFrame* aSource, const DrawTarget* aDrawTarget, + const gfxMatrix& aContextMatrix, StyleSVGPaint nsStyleSVG::*aFillOrStroke, + float aGraphicOpacity, imgDrawingParams& aImgParams, + const gfxRect* aOverrideBounds) override; + + // nsIFrame interface: + nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, + int32_t aModType) override; + +#ifdef DEBUG_FRAME_DUMP + nsresult GetFrameName(nsAString& aResult) const override { + return MakeFrameName(u"SVGGradient"_ns, aResult); + } +#endif // DEBUG + + private: + /** + * Parses this frame's href and - if it references another gradient - returns + * it. It also makes this frame a rendering observer of the specified ID. + */ + SVGGradientFrame* GetReferencedGradient(); + + void GetStops(nsTArray<ColorStop>* aStops, float aGraphicOpacity); + + const SVGAnimatedTransformList* GetGradientTransformList( + nsIContent* aDefault); + // Will be singular for gradientUnits="objectBoundingBox" with an empty bbox. + gfxMatrix GetGradientTransform(nsIFrame* aSource, + const gfxRect* aOverrideBounds); + + protected: + virtual bool GradientVectorLengthIsZero() = 0; + virtual already_AddRefed<gfxPattern> CreateGradient() = 0; + + // Accessors to lookup gradient attributes + uint16_t GetEnumValue(uint32_t aIndex, nsIContent* aDefault); + uint16_t GetEnumValue(uint32_t aIndex) { + return GetEnumValue(aIndex, mContent); + } + uint16_t GetGradientUnits(); + uint16_t GetSpreadMethod(); + + // Gradient-type-specific lookups since the length values differ between + // linear and radial gradients + virtual dom::SVGLinearGradientElement* GetLinearGradientWithLength( + uint32_t aIndex, dom::SVGLinearGradientElement* aDefault); + virtual dom::SVGRadialGradientElement* GetRadialGradientWithLength( + uint32_t aIndex, dom::SVGRadialGradientElement* aDefault); + + // The frame our gradient is (currently) being applied to + nsIFrame* mSource; + + private: + // Flag to mark this frame as "in use" during recursive calls along our + // gradient's reference chain so we can detect reference loops. See: + // http://www.w3.org/TR/SVG11/pservers.html#LinearGradientElementHrefAttribute + bool mLoopFlag; + // Gradients often don't reference other gradients, so here we cache + // the fact that that isn't happening. + bool mNoHRefURI; +}; + +// ------------------------------------------------------------------------- +// Linear Gradients +// ------------------------------------------------------------------------- + +class SVGLinearGradientFrame final : public SVGGradientFrame { + friend nsIFrame* ::NS_NewSVGLinearGradientFrame( + mozilla::PresShell* aPresShell, ComputedStyle* aStyle); + + protected: + explicit SVGLinearGradientFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext) + : SVGGradientFrame(aStyle, aPresContext, kClassID) {} + + public: + NS_DECL_QUERYFRAME + NS_DECL_FRAMEARENA_HELPERS(SVGLinearGradientFrame) + + // nsIFrame interface: +#ifdef DEBUG + void Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; +#endif + + nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, + int32_t aModType) override; + +#ifdef DEBUG_FRAME_DUMP + nsresult GetFrameName(nsAString& aResult) const override { + return MakeFrameName(u"SVGLinearGradient"_ns, aResult); + } +#endif // DEBUG + + protected: + float GetLengthValue(uint32_t aIndex); + mozilla::dom::SVGLinearGradientElement* GetLinearGradientWithLength( + uint32_t aIndex, + mozilla::dom::SVGLinearGradientElement* aDefault) override; + bool GradientVectorLengthIsZero() override; + already_AddRefed<gfxPattern> CreateGradient() override; +}; + +// ------------------------------------------------------------------------- +// Radial Gradients +// ------------------------------------------------------------------------- + +class SVGRadialGradientFrame final : public SVGGradientFrame { + friend nsIFrame* ::NS_NewSVGRadialGradientFrame( + mozilla::PresShell* aPresShell, ComputedStyle* aStyle); + + protected: + explicit SVGRadialGradientFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext) + : SVGGradientFrame(aStyle, aPresContext, kClassID) {} + + public: + NS_DECL_QUERYFRAME + NS_DECL_FRAMEARENA_HELPERS(SVGRadialGradientFrame) + + // nsIFrame interface: +#ifdef DEBUG + void Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) override; +#endif + + nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute, + int32_t aModType) override; + +#ifdef DEBUG_FRAME_DUMP + nsresult GetFrameName(nsAString& aResult) const override { + return MakeFrameName(u"SVGRadialGradient"_ns, aResult); + } +#endif // DEBUG + + protected: + float GetLengthValue(uint32_t aIndex); + float GetLengthValue(uint32_t aIndex, float aDefaultValue); + float GetLengthValueFromElement( + uint32_t aIndex, mozilla::dom::SVGRadialGradientElement& aElement); + mozilla::dom::SVGRadialGradientElement* GetRadialGradientWithLength( + uint32_t aIndex, + mozilla::dom::SVGRadialGradientElement* aDefault) override; + bool GradientVectorLengthIsZero() override; + already_AddRefed<gfxPattern> CreateGradient() override; +}; + +} // namespace mozilla + +#endif // LAYOUT_SVG_SVGGRADIENTFRAME_H_ |