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

   1 /*
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  13  * in the documentation and/or other materials provided with the
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  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/V8Binding.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 WebCore {
  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::toNative(holder);
  55     TOSTRING_VOID(V8StringResource<>, contextIdResource, info[0]);
  56     String contextId = contextIdResource;
  57     RefPtr<CanvasContextAttributes> attributes;
  58     if (contextId == "webgl" || contextId == "experimental-webgl") {
  59         RefPtr<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))
  64                 webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
  65             v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
  66             if (jsAttributes->Has(depth))
  67                 webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
  68             v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
  69             if (jsAttributes->Has(stencil))
  70                 webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
  71             v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
  72             if (jsAttributes->Has(antialias))
  73                 webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
  74             v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
  75             if (jsAttributes->Has(premultipliedAlpha))
  76                 webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
  77             v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
  78             if (jsAttributes->Has(preserveDrawingBuffer))
  79                 webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
  80             v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
  81             if (jsAttributes->Has(failIfMajorPerformanceCaveat))
  82                 webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
  83         }
  84         attributes = webGLAttributes;
  85     } else {
  86         RefPtr<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))
  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             ScriptObject context(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
 105             ScriptObject 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             ScriptObject glContext(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
 119             ScriptObject 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::toNative(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 WebCore