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 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 } 131 132 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
