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115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SVG project.
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*
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* The Initial Developer of the Original Code is IBM Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2005
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __NS_SVGMASKFRAME_H__
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#define __NS_SVGMASKFRAME_H__
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#include "nsSVGContainerFrame.h"
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#include "gfxPattern.h"
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#include "gfxMatrix.h"
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class gfxContext;
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typedef nsSVGContainerFrame nsSVGMaskFrameBase;
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class nsSVGMaskFrame : public nsSVGMaskFrameBase
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{
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friend nsIFrame*
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NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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protected:
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nsSVGMaskFrame(nsStyleContext* aContext) :
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nsSVGMaskFrameBase(aContext),
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mMaskParentMatrix(nsnull),
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mInUse(PR_FALSE) {}
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public:
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// nsSVGMaskFrame method:
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already_AddRefed<gfxPattern> ComputeMaskAlpha(nsSVGRenderState *aContext,
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nsIFrame* aParent,
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const gfxMatrix &aMatrix,
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float aOpacity = 1.0f);
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#ifdef DEBUG
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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#endif
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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;
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const
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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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// 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 AutoMaskReferencer
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{
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public:
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AutoMaskReferencer(nsSVGMaskFrame *aFrame)
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: mFrame(aFrame) {
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NS_ASSERTION(mFrame->mInUse == PR_FALSE, "reference loop!");
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mFrame->mInUse = PR_TRUE;
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}
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~AutoMaskReferencer() {
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mFrame->mInUse = PR_FALSE;
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}
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private:
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nsSVGMaskFrame *mFrame;
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};
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nsIFrame *mMaskParent;
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nsCOMPtr<nsIDOMSVGMatrix> mMaskParentMatrix;
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// recursion prevention flag
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PRPackedBool mInUse;
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// nsSVGContainerFrame methods:
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virtual gfxMatrix GetCanvasTM();
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};
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#endif
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