1 | /* |
2 | * Copyright (C) 2009, 2017 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #pragma once |
27 | |
28 | #include "CanvasBase.h" |
29 | #include "GraphicsLayer.h" |
30 | #include "ScriptWrappable.h" |
31 | #include <wtf/Forward.h> |
32 | #include <wtf/IsoMalloc.h> |
33 | #include <wtf/Noncopyable.h> |
34 | #include <wtf/text/StringHash.h> |
35 | |
36 | namespace WebCore { |
37 | |
38 | class CanvasPattern; |
39 | class HTMLCanvasElement; |
40 | class HTMLImageElement; |
41 | class HTMLVideoElement; |
42 | class ImageBitmap; |
43 | class TypedOMCSSImageValue; |
44 | class WebGLObject; |
45 | |
46 | class CanvasRenderingContext : public ScriptWrappable { |
47 | WTF_MAKE_NONCOPYABLE(CanvasRenderingContext); |
48 | WTF_MAKE_ISO_ALLOCATED(CanvasRenderingContext); |
49 | public: |
50 | virtual ~CanvasRenderingContext(); |
51 | |
52 | static HashSet<CanvasRenderingContext*>& instances(const LockHolder&); |
53 | static Lock& instancesMutex(); |
54 | |
55 | void ref(); |
56 | WEBCORE_EXPORT void deref(); |
57 | |
58 | CanvasBase& canvasBase() const { return m_canvas; } |
59 | |
60 | virtual bool is2d() const { return false; } |
61 | virtual bool isWebGL1() const { return false; } |
62 | virtual bool isWebGL2() const { return false; } |
63 | bool isWebGL() const { return isWebGL1() || isWebGL2(); } |
64 | #if ENABLE(WEBGPU) |
65 | virtual bool isWebGPU() const { return false; } |
66 | #endif |
67 | virtual bool isGPUBased() const { return false; } |
68 | virtual bool isAccelerated() const { return false; } |
69 | virtual bool isBitmapRenderer() const { return false; } |
70 | virtual bool isPlaceholder() const { return false; } |
71 | virtual bool isOffscreen2d() const { return false; } |
72 | virtual bool isPaint() const { return false; } |
73 | |
74 | virtual void paintRenderingResultsToCanvas() {} |
75 | virtual PlatformLayer* platformLayer() const { return 0; } |
76 | |
77 | bool callTracingActive() const { return m_callTracingActive; } |
78 | void setCallTracingActive(bool callTracingActive) { m_callTracingActive = callTracingActive; } |
79 | |
80 | protected: |
81 | explicit CanvasRenderingContext(CanvasBase&); |
82 | bool wouldTaintOrigin(const CanvasPattern*); |
83 | bool wouldTaintOrigin(const CanvasBase*); |
84 | bool wouldTaintOrigin(const HTMLImageElement*); |
85 | bool wouldTaintOrigin(const HTMLVideoElement*); |
86 | bool wouldTaintOrigin(const ImageBitmap*); |
87 | bool wouldTaintOrigin(const URL&); |
88 | |
89 | template<class T> void checkOrigin(const T* arg) |
90 | { |
91 | if (wouldTaintOrigin(arg)) |
92 | m_canvas.setOriginTainted(); |
93 | } |
94 | void checkOrigin(const URL&); |
95 | void checkOrigin(const TypedOMCSSImageValue&); |
96 | |
97 | bool m_callTracingActive { false }; |
98 | |
99 | private: |
100 | CanvasBase& m_canvas; |
101 | }; |
102 | |
103 | } // namespace WebCore |
104 | |
105 | #define SPECIALIZE_TYPE_TRAITS_CANVASRENDERINGCONTEXT(ToValueTypeName, predicate) \ |
106 | SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \ |
107 | static bool isType(const WebCore::CanvasRenderingContext& context) { return context.predicate; } \ |
108 | SPECIALIZE_TYPE_TRAITS_END() |
109 | |