1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 : /* ***** BEGIN LICENSE BLOCK *****
3 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
4 : *
5 : * The contents of this file are subject to the Mozilla Public License Version
6 : * 1.1 (the "License"); you may not use this file except in compliance with
7 : * the License. You may obtain a copy of the License at
8 : * http://www.mozilla.org/MPL/
9 : *
10 : * Software distributed under the License is distributed on an "AS IS" basis,
11 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12 : * for the specific language governing rights and limitations under the
13 : * License.
14 : *
15 : * The Original Code is the Mozilla SVG project.
16 : *
17 : * The Initial Developer of the Original Code is IBM Corporation.
18 : * Portions created by the Initial Developer are Copyright (C) 2005
19 : * the Initial Developer. All Rights Reserved.
20 : *
21 : * Contributor(s):
22 : *
23 : * Alternatively, the contents of this file may be used under the terms of
24 : * either the GNU General Public License Version 2 or later (the "GPL"), or
25 : * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
26 : * in which case the provisions of the GPL or the LGPL are applicable instead
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30 : * decision by deleting the provisions above and replace them with the notice
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32 : * the provisions above, a recipient may use your version of this file under
33 : * the terms of any one of the MPL, the GPL or the LGPL.
34 : *
35 : * ***** END LICENSE BLOCK ***** */
36 :
37 : #ifndef __NS_SVGMASKFRAME_H__
38 : #define __NS_SVGMASKFRAME_H__
39 :
40 : #include "nsSVGContainerFrame.h"
41 : #include "gfxPattern.h"
42 : #include "gfxMatrix.h"
43 :
44 : class gfxContext;
45 : class nsRenderingContext;
46 :
47 : typedef nsSVGContainerFrame nsSVGMaskFrameBase;
48 :
49 : class nsSVGMaskFrame : public nsSVGMaskFrameBase
50 0 : {
51 : friend nsIFrame*
52 : NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
53 : protected:
54 0 : nsSVGMaskFrame(nsStyleContext* aContext)
55 : : nsSVGMaskFrameBase(aContext)
56 0 : , mInUse(false)
57 : {
58 0 : AddStateBits(NS_STATE_SVG_NONDISPLAY_CHILD);
59 0 : }
60 :
61 : public:
62 : NS_DECL_FRAMEARENA_HELPERS
63 :
64 : // nsSVGMaskFrame method:
65 : already_AddRefed<gfxPattern> ComputeMaskAlpha(nsRenderingContext *aContext,
66 : nsIFrame* aParent,
67 : const gfxMatrix &aMatrix,
68 : float aOpacity = 1.0f);
69 :
70 : virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
71 :
72 : NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
73 : nsIAtom* aAttribute,
74 : PRInt32 aModType);
75 :
76 : #ifdef DEBUG
77 : NS_IMETHOD Init(nsIContent* aContent,
78 : nsIFrame* aParent,
79 : nsIFrame* aPrevInFlow);
80 : #endif
81 :
82 : /**
83 : * Get the "type" of the frame
84 : *
85 : * @see nsGkAtoms::svgMaskFrame
86 : */
87 : virtual nsIAtom* GetType() const;
88 :
89 : #ifdef DEBUG
90 0 : NS_IMETHOD GetFrameName(nsAString& aResult) const
91 : {
92 0 : return MakeFrameName(NS_LITERAL_STRING("SVGMask"), aResult);
93 : }
94 : #endif
95 :
96 : private:
97 : // A helper class to allow us to paint masks safely. The helper
98 : // automatically sets and clears the mInUse flag on the mask frame
99 : // (to prevent nasty reference loops). It's easy to mess this up
100 : // and break things, so this helper makes the code far more robust.
101 : class AutoMaskReferencer
102 : {
103 : public:
104 0 : AutoMaskReferencer(nsSVGMaskFrame *aFrame)
105 0 : : mFrame(aFrame) {
106 0 : NS_ASSERTION(!mFrame->mInUse, "reference loop!");
107 0 : mFrame->mInUse = true;
108 0 : }
109 0 : ~AutoMaskReferencer() {
110 0 : mFrame->mInUse = false;
111 0 : }
112 : private:
113 : nsSVGMaskFrame *mFrame;
114 : };
115 :
116 : nsIFrame *mMaskParent;
117 : nsAutoPtr<gfxMatrix> mMaskParentMatrix;
118 : // recursion prevention flag
119 : bool mInUse;
120 :
121 : // nsSVGContainerFrame methods:
122 : virtual gfxMatrix GetCanvasTM();
123 : };
124 :
125 : #endif
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