src/third_party/WebKit/Source/bindings/v8/custom/V8HTMLCanvasElementCustom.cpp

   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 "V8HTMLCanvasElement.h"
  34
  35 #include "V8CanvasRenderingContext2D.h"
  36 #include "V8Node.h"
  37 #include "V8WebGLRenderingContext.h"
  38 #include "bindings/v8/ExceptionState.h"
  39 #include "bindings/v8/ScriptState.h"
  40 #include "bindings/v8/V8Binding.h"
  41 #include "core/html/HTMLCanvasElement.h"
  42 #include "core/html/canvas/Canvas2DContextAttributes.h"
  43 #include "core/html/canvas/CanvasRenderingContext.h"
  44 #include "core/html/canvas/WebGLContextAttributes.h"
  45 #include "core/inspector/InspectorCanvasInstrumentation.h"
  46 #include "wtf/MathExtras.h"
  47 #include "wtf/text/WTFString.h"
  48
  49 namespace WebCore {
  50
  51 void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
  52 {
  53     v8::Handle<v8::Object> holder = info.Holder();
  54     v8::Isolate* isolate = info.GetIsolate();
  55     HTMLCanvasElement* impl = V8HTMLCanvasElement::toNative(holder);
  56     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, contextIdResource, info[0]);
  57     String contextId = contextIdResource;
  58     RefPtr<CanvasContextAttributes> attributes;
  59     if (contextId == "webgl" || contextId == "experimental-webgl" || contextId == "webkit-3d") {
  60         RefPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
  61         if (info.Length() > 1 && info[1]->IsObject()) {
  62             v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
  63             v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
  64             if (jsAttributes->Has(alpha))
  65                 webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
  66             v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
  67             if (jsAttributes->Has(depth))
  68                 webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
  69             v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
  70             if (jsAttributes->Has(stencil))
  71                 webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
  72             v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
  73             if (jsAttributes->Has(antialias))
  74                 webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
  75             v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
  76             if (jsAttributes->Has(premultipliedAlpha))
  77                 webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
  78             v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
  79             if (jsAttributes->Has(preserveDrawingBuffer))
  80                 webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
  81             v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
  82             if (jsAttributes->Has(failIfMajorPerformanceCaveat))
  83                 webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
  84         }
  85         attributes = webGLAttributes;
  86     } else {
  87         RefPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
  88         if (info.Length() > 1 && info[1]->IsObject()) {
  89             v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
  90             v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
  91             if (jsAttributes->Has(alpha))
  92                 canvas2DAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
  93         }
  94         attributes = canvas2DAttributes;
  95     }
  96     CanvasRenderingContext* result = impl->getContext(contextId, attributes.get());
  97     if (!result) {
  98         v8SetReturnValueNull(info);
  99         return;
 100     }
 101     if (result->is2d()) {
 102         v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
 103         if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
 104             ScriptState* scriptState = ScriptState::forContext(isolate->GetCurrentContext());
 105             ScriptObject context(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
 106             ScriptObject wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(&impl->document(), context);
 107             if (!wrapped.hasNoValue()) {
 108                 v8SetReturnValue(info, wrapped.v8Value());
 109                 return;
 110             }
 111         }
 112         v8SetReturnValue(info, v8Result);
 113         return;
 114     }
 115     if (result->is3d()) {
 116         v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
 117         if (InspectorInstrumentation::canvasAgentEnabled(&impl->document())) {
 118             ScriptState* scriptState = ScriptState::forContext(isolate->GetCurrentContext());
 119             ScriptObject glContext(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
 120             ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(&impl->document(), glContext);
 121             if (!wrapped.hasNoValue()) {
 122                 v8SetReturnValue(info, wrapped.v8Value());
 123                 return;
 124             }
 125         }
 126         v8SetReturnValue(info, v8Result);
 127         return;
 128     }
 129     ASSERT_NOT_REACHED();
 130     v8SetReturnValueNull(info);
 131 }
 132
 133 void V8HTMLCanvasElement::toDataURLMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 134 {
 135     v8::Handle<v8::Object> holder = info.Holder();
 136     HTMLCanvasElement* canvas = V8HTMLCanvasElement::toNative(holder);
 137     ExceptionState exceptionState(ExceptionState::ExecutionContext, "toDataURL", "HTMLCanvasElement", info.Holder(), info.GetIsolate());
 138
 139     V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, type, info[0]);
 140     double quality;
 141     double* qualityPtr = 0;
 142     if (info.Length() > 1 && info[1]->IsNumber()) {
 143         quality = info[1]->NumberValue();
 144         qualityPtr = &quality;
 145     }
 146
 147     String result = canvas->toDataURL(type, qualityPtr, exceptionState);
 148     exceptionState.throwIfNeeded();
 149     v8SetReturnValueStringOrUndefined(info, result, info.GetIsolate());
 150 }
 151
 152 } // namespace WebCore