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) 2004
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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32 : * the provisions above, a recipient may use your version of this file under
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34 : *
35 : * ***** END LICENSE BLOCK ***** */
36 :
37 : #ifndef __NS_SVGCLIPPATHFRAME_H__
38 : #define __NS_SVGCLIPPATHFRAME_H__
39 :
40 : #include "nsSVGContainerFrame.h"
41 : #include "gfxMatrix.h"
42 :
43 : class nsRenderingContext;
44 :
45 : typedef nsSVGContainerFrame nsSVGClipPathFrameBase;
46 :
47 : class nsSVGClipPathFrame : public nsSVGClipPathFrameBase
48 0 : {
49 : friend nsIFrame*
50 : NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
51 : protected:
52 0 : nsSVGClipPathFrame(nsStyleContext* aContext)
53 : : nsSVGClipPathFrameBase(aContext)
54 0 : , mInUse(false)
55 : {
56 0 : AddStateBits(NS_STATE_SVG_NONDISPLAY_CHILD);
57 0 : }
58 :
59 : public:
60 : NS_DECL_FRAMEARENA_HELPERS
61 :
62 : // nsSVGClipPathFrame methods:
63 : nsresult ClipPaint(nsRenderingContext* aContext,
64 : nsIFrame* aParent,
65 : const gfxMatrix &aMatrix);
66 :
67 : bool ClipHitTest(nsIFrame* aParent,
68 : const gfxMatrix &aMatrix,
69 : const nsPoint &aPoint);
70 :
71 : // Check if this clipPath is made up of more than one geometry object.
72 : // If so, the clipping API in cairo isn't enough and we need to use
73 : // mask based clipping.
74 : bool IsTrivial();
75 :
76 : bool IsValid();
77 :
78 : // nsIFrame interface:
79 : NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
80 : nsIAtom* aAttribute,
81 : PRInt32 aModType);
82 :
83 : NS_IMETHOD Init(nsIContent* aContent,
84 : nsIFrame* aParent,
85 : nsIFrame* aPrevInFlow);
86 :
87 : /**
88 : * Get the "type" of the frame
89 : *
90 : * @see nsGkAtoms::svgClipPathFrame
91 : */
92 : virtual nsIAtom* GetType() const;
93 :
94 : #ifdef DEBUG
95 0 : NS_IMETHOD GetFrameName(nsAString& aResult) const
96 : {
97 0 : return MakeFrameName(NS_LITERAL_STRING("SVGClipPath"), aResult);
98 : }
99 : #endif
100 :
101 : private:
102 : // A helper class to allow us to paint clip paths safely. The helper
103 : // automatically sets and clears the mInUse flag on the clip path frame
104 : // (to prevent nasty reference loops). It's easy to mess this up
105 : // and break things, so this helper makes the code far more robust.
106 : class AutoClipPathReferencer
107 : {
108 : public:
109 0 : AutoClipPathReferencer(nsSVGClipPathFrame *aFrame)
110 0 : : mFrame(aFrame) {
111 0 : NS_ASSERTION(!mFrame->mInUse, "reference loop!");
112 0 : mFrame->mInUse = true;
113 0 : }
114 0 : ~AutoClipPathReferencer() {
115 0 : mFrame->mInUse = false;
116 0 : }
117 : private:
118 : nsSVGClipPathFrame *mFrame;
119 : };
120 :
121 : nsIFrame *mClipParent;
122 : nsAutoPtr<gfxMatrix> mClipParentMatrix;
123 : // recursion prevention flag
124 : bool mInUse;
125 :
126 : // nsSVGContainerFrame methods:
127 : virtual gfxMatrix GetCanvasTM();
128 : };
129 :
130 : #endif
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