131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __NS_SVGMASKFRAME_H__
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#define __NS_SVGMASKFRAME_H__
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#include "mozilla/Attributes.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.h"
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#include "gfxPattern.h"
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#include "gfxMatrix.h"
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#include "nsSVGContainerFrame.h"
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#include "nsSVGUtils.h"
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class gfxContext;
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/**
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* Byte offsets of channels in a native packed gfxColor or cairo image surface.
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*/
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#ifdef IS_BIG_ENDIAN
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#define GFX_ARGB32_OFFSET_A 0
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#define GFX_ARGB32_OFFSET_R 1
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#define GFX_ARGB32_OFFSET_G 2
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#define GFX_ARGB32_OFFSET_B 3
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#else
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#define GFX_ARGB32_OFFSET_A 3
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#define GFX_ARGB32_OFFSET_R 2
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#define GFX_ARGB32_OFFSET_G 1
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#define GFX_ARGB32_OFFSET_B 0
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#endif
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class nsSVGMaskFrame final : public nsSVGContainerFrame
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{
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friend nsIFrame*
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NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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typedef mozilla::gfx::Matrix Matrix;
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typedef mozilla::gfx::SourceSurface SourceSurface;
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protected:
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explicit nsSVGMaskFrame(nsStyleContext* aContext)
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: nsSVGContainerFrame(aContext)
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, mInUse(false)
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{
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AddStateBits(NS_FRAME_IS_NONDISPLAY);
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}
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public:
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NS_DECL_FRAMEARENA_HELPERS
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// nsSVGMaskFrame method:
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already_AddRefed<SourceSurface>
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GetMaskForMaskedFrame(gfxContext* aContext,
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nsIFrame* aMaskedFrame,
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const gfxMatrix &aMatrix,
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float aOpacity,
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Matrix* aMaskTransform,
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uint8_t aMaskOp = NS_STYLE_MASK_MODE_MATCH_SOURCE);
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gfxRect
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GetMaskArea(nsIFrame* aMaskedFrame);
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virtual nsresult AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType) override;
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#ifdef DEBUG
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virtual void Init(nsIContent* aContent,
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nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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#endif
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override {}
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::svgMaskFrame
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*/
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virtual nsIAtom* GetType() const override;
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override
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{
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return MakeFrameName(NS_LITERAL_STRING("SVGMask"), aResult);
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}
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#endif
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private:
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/**
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* If the mask element transforms its children due to
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* maskContentUnits="objectBoundingBox" being set on it, this function
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* returns the resulting transform.
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*/
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gfxMatrix GetMaskTransform(nsIFrame* aMaskedFrame);
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// A helper class to allow us to paint masks safely. The helper
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// automatically sets and clears the mInUse flag on the mask frame
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// (to prevent nasty reference loops). It's easy to mess this up
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// and break things, so this helper makes the code far more robust.
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class MOZ_RAII AutoMaskReferencer
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{
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public:
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explicit AutoMaskReferencer(nsSVGMaskFrame *aFrame
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mFrame(aFrame) {
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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NS_ASSERTION(!mFrame->mInUse, "reference loop!");
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mFrame->mInUse = true;
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}
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~AutoMaskReferencer() {
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mFrame->mInUse = false;
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}
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private:
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nsSVGMaskFrame *mFrame;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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gfxMatrix mMatrixForChildren;
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// recursion prevention flag
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bool mInUse;
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// nsSVGContainerFrame methods:
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virtual gfxMatrix GetCanvasTM() override;
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};
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#endif
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