1 /*
2 * Copyright (C) 2007-2009 Google Inc. All rights reserved.
3 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 * * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "config.h"
33 #include "bindings/core/v8/V8HTMLCanvasElement.h"
34
35 #include "bindings/core/v8/ExceptionState.h"
36 #include "bindings/core/v8/V8Binding.h"
37 #include "bindings/core/v8/V8CanvasRenderingContext2D.h"
38 #include "bindings/core/v8/V8Node.h"
39 #include "bindings/core/v8/V8WebGLRenderingContext.h"
40 #include "core/html/HTMLCanvasElement.h"
41 #include "core/html/canvas/Canvas2DContextAttributes.h"
42 #include "core/html/canvas/CanvasRenderingContext.h"
43 #include "core/html/canvas/WebGLContextAttributes.h"
44 #include "core/inspector/InspectorCanvasInstrumentation.h"
45 #include "wtf/MathExtras.h"
46 #include "wtf/text/WTFString.h"
47
48 namespace blink {
49
getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value> & info)50 void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
51 {
52 v8::Handle<v8::Object> holder = info.Holder();
53 v8::Isolate* isolate = info.GetIsolate();
54 HTMLCanvasElement* impl = V8HTMLCanvasElement::toImpl(holder);
55 TOSTRING_VOID(V8StringResource<>, contextIdResource, info[0]);
56 String contextId = contextIdResource;
57 RefPtrWillBeRawPtr<CanvasContextAttributes> attributes = nullptr;
58 if (contextId == "webgl" || contextId == "experimental-webgl") {
59 RefPtrWillBeRawPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
60 if (info.Length() > 1 && info[1]->IsObject()) {
61 v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
62 v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
63 if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
64 webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
65 v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
66 if (jsAttributes->Has(depth) && !isUndefinedOrNull(jsAttributes->Get(depth)))
67 webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
68 v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
69 if (jsAttributes->Has(stencil) && !isUndefinedOrNull(jsAttributes->Get(stencil)))
70 webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
71 v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
72 if (jsAttributes->Has(antialias) && !isUndefinedOrNull(jsAttributes->Get(antialias)))
73 webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
74 v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
75 if (jsAttributes->Has(premultipliedAlpha) && !isUndefinedOrNull(jsAttributes->Get(premultipliedAlpha)))
76 webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
77 v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
78 if (jsAttributes->Has(preserveDrawingBuffer) && !isUndefinedOrNull(jsAttributes->Get(preserveDrawingBuffer)))
79 webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
80 v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
81 if (jsAttributes->Has(failIfMajorPerformanceCaveat) && !isUndefinedOrNull(jsAttributes->Get(failIfMajorPerformanceCaveat)))
82 webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
83 }
84 attributes = webGLAttributes;
85 } else {
86 RefPtrWillBeRawPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
87 if (info.Length() > 1 && info[1]->IsObject()) {
88 v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
89 v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
90 if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
91 canvas2DAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
92 }
93 attributes = canvas2DAttributes;
94 }
95 CanvasRenderingContext* result = impl->getContext(contextId, attributes.get());
96 if (!result) {
97 v8SetReturnValueNull(info);
98 return;
99 }
100 if (result->is2d()) {
101 v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
102 if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
103 ScriptState* scriptState = ScriptState::current(isolate);
104 ScriptValue context(scriptState, v8Result);
105 ScriptValue wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(&impl->document(), context);
106 if (!wrapped.isEmpty()) {
107 v8SetReturnValue(info, wrapped.v8Value());
108 return;
109 }
110 }
111 v8SetReturnValue(info, v8Result);
112 return;
113 }
114 if (result->is3d()) {
115 v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
116 if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
117 ScriptState* scriptState = ScriptState::current(isolate);
118 ScriptValue glContext(scriptState, v8Result);
119 ScriptValue wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(&impl->document(), glContext);
120 if (!wrapped.isEmpty()) {
121 v8SetReturnValue(info, wrapped.v8Value());
122 return;
123 }
124 }
125 v8SetReturnValue(info, v8Result);
126 return;
127 }
128 ASSERT_NOT_REACHED();
129 v8SetReturnValueNull(info);
130 }
131
toDataURLMethodCustom(const v8::FunctionCallbackInfo<v8::Value> & info)132 void V8HTMLCanvasElement::toDataURLMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
133 {
134 v8::Handle<v8::Object> holder = info.Holder();
135 HTMLCanvasElement* canvas = V8HTMLCanvasElement::toImpl(holder);
136 ExceptionState exceptionState(ExceptionState::ExecutionContext, "toDataURL", "HTMLCanvasElement", info.Holder(), info.GetIsolate());
137
138 TOSTRING_VOID(V8StringResource<>, type, info[0]);
139 double quality;
140 double* qualityPtr = 0;
141 if (info.Length() > 1 && info[1]->IsNumber()) {
142 quality = info[1]->NumberValue();
143 qualityPtr = &quality;
144 }
145
146 String result = canvas->toDataURL(type, qualityPtr, exceptionState);
147 exceptionState.throwIfNeeded();
148 v8SetReturnValueStringOrUndefined(info, result, info.GetIsolate());
149 }
150
151 } // namespace blink
152