C++ HTMLCanvasElement::getContext方法代码示例

JSValue JSHTMLCanvasElement::getContext(ExecState* exec)
{
    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
    const String& contextId = exec->argument(0).toString(exec)->value(exec);
    
    RefPtr<CanvasContextAttributes> attrs;
#if ENABLE(WEBGL)
    if (HTMLCanvasElement::is3dType(contextId)) {
        get3DContextAttributes(exec, attrs);
        if (exec->hadException())
            return jsUndefined();
    }
#endif
    
    CanvasRenderingContext* context = canvas->getContext(contextId, attrs.get());
    if (!context)
        return jsNull();
    JSValue jsValue = toJS(exec, globalObject(), WTF::getPtr(context));
    if (InspectorInstrumentation::canvasAgentEnabled(canvas->document())) {
        ScriptObject contextObject(exec, jsValue.getObject());
        ScriptObject wrapped;
        if (context->is2d())
            wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(canvas->document(), contextObject);
#if ENABLE(WEBGL)
        else if (context->is3d())
            wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(canvas->document(), contextObject);
#endif
        if (!wrapped.hasNoValue())
            return wrapped.jsValue();
    }
    return jsValue;
}

void V8HTMLCanvasElement::getContextMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
{
    v8::Handle<v8::Object> holder = info.Holder();
    v8::Isolate* isolate = info.GetIsolate();
    HTMLCanvasElement* impl = V8HTMLCanvasElement::toNative(holder);
    TOSTRING_VOID(V8StringResource<>, contextIdResource, info[0]);
    String contextId = contextIdResource;
    RefPtr<CanvasContextAttributes> attributes = nullptr;
    if (contextId == "webgl" || contextId == "experimental-webgl") {
        RefPtr<WebGLContextAttributes> webGLAttributes = WebGLContextAttributes::create();
        if (info.Length() > 1 && info[1]->IsObject()) {
            v8::Handle<v8::Object> jsAttributes = info[1]->ToObject();
            v8::Handle<v8::String> alpha = v8AtomicString(isolate, "alpha");
            if (jsAttributes->Has(alpha) && !isUndefinedOrNull(jsAttributes->Get(alpha)))
                webGLAttributes->setAlpha(jsAttributes->Get(alpha)->BooleanValue());
            v8::Handle<v8::String> depth = v8AtomicString(isolate, "depth");
            if (jsAttributes->Has(depth) && !isUndefinedOrNull(jsAttributes->Get(depth)))
                webGLAttributes->setDepth(jsAttributes->Get(depth)->BooleanValue());
            v8::Handle<v8::String> stencil = v8AtomicString(isolate, "stencil");
            if (jsAttributes->Has(stencil) && !isUndefinedOrNull(jsAttributes->Get(stencil)))
                webGLAttributes->setStencil(jsAttributes->Get(stencil)->BooleanValue());
            v8::Handle<v8::String> antialias = v8AtomicString(isolate, "antialias");
            if (jsAttributes->Has(antialias) && !isUndefinedOrNull(jsAttributes->Get(antialias)))
                webGLAttributes->setAntialias(jsAttributes->Get(antialias)->BooleanValue());
            v8::Handle<v8::String> premultipliedAlpha = v8AtomicString(isolate, "premultipliedAlpha");
            if (jsAttributes->Has(premultipliedAlpha) && !isUndefinedOrNull(jsAttributes->Get(premultipliedAlpha)))
                webGLAttributes->setPremultipliedAlpha(jsAttributes->Get(premultipliedAlpha)->BooleanValue());
            v8::Handle<v8::String> preserveDrawingBuffer = v8AtomicString(isolate, "preserveDrawingBuffer");
            if (jsAttributes->Has(preserveDrawingBuffer) && !isUndefinedOrNull(jsAttributes->Get(preserveDrawingBuffer)))
                webGLAttributes->setPreserveDrawingBuffer(jsAttributes->Get(preserveDrawingBuffer)->BooleanValue());
            v8::Handle<v8::String> failIfMajorPerformanceCaveat = v8AtomicString(isolate, "failIfMajorPerformanceCaveat");
            if (jsAttributes->Has(failIfMajorPerformanceCaveat) && !isUndefinedOrNull(jsAttributes->Get(failIfMajorPerformanceCaveat)))
                webGLAttributes->setFailIfMajorPerformanceCaveat(jsAttributes->Get(failIfMajorPerformanceCaveat)->BooleanValue());
        }
        attributes = webGLAttributes;
    } else {
        RefPtr<Canvas2DContextAttributes> canvas2DAttributes = Canvas2DContextAttributes::create();
        attributes = canvas2DAttributes;
    }
    CanvasRenderingContext* result = impl->getContext(contextId, attributes.get());
    if (!result) {
        v8SetReturnValueNull(info);
        return;
    }
    if (result->is2d()) {
        v8::Handle<v8::Value> v8Result = toV8(toCanvasRenderingContext2D(result), info.Holder(), info.GetIsolate());
        v8SetReturnValue(info, v8Result);
        return;
    }
    if (result->is3d()) {
        v8::Handle<v8::Value> v8Result = toV8(toWebGLRenderingContext(result), info.Holder(), info.GetIsolate());
        v8SetReturnValue(info, v8Result);
        return;
    }
    ASSERT_NOT_REACHED();
    v8SetReturnValueNull(info);
}

JSValue* jsHTMLCanvasElementPrototypeFunctionGetContext(ExecState* exec, JSObject*, JSValue* thisValue, const ArgList& args)
{
    if (!thisValue->isObject(&JSHTMLCanvasElement::s_info))
        return throwError(exec, TypeError);
    JSHTMLCanvasElement* castedThisObj = static_cast<JSHTMLCanvasElement*>(thisValue);
    HTMLCanvasElement* imp = static_cast<HTMLCanvasElement*>(castedThisObj->impl());
    const UString& contextId = args[0]->toString(exec);


    KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->getContext(contextId)));
    return result;
}

JSValue JSHTMLCanvasElement::getContext(ExecState* exec)
{
    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(impl());
    const UString& contextId = exec->argument(0).toString(exec)->value(exec);
    RefPtr<CanvasContextAttributes> attrs;
#if ENABLE(WEBGL)
    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
        attrs = WebGLContextAttributes::create();
        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
        if (exec->argumentCount() > 1 && exec->argument(1).isObject()) {
            JSObject* jsAttrs = exec->argument(1).getObject();
            Identifier alpha(exec, "alpha");
            if (jsAttrs->hasProperty(exec, alpha))
                webGLAttrs->setAlpha(jsAttrs->get(exec, alpha).toBoolean(exec));
            Identifier depth(exec, "depth");
            if (jsAttrs->hasProperty(exec, depth))
                webGLAttrs->setDepth(jsAttrs->get(exec, depth).toBoolean(exec));
            Identifier stencil(exec, "stencil");
            if (jsAttrs->hasProperty(exec, stencil))
                webGLAttrs->setStencil(jsAttrs->get(exec, stencil).toBoolean(exec));
            Identifier antialias(exec, "antialias");
            if (jsAttrs->hasProperty(exec, antialias))
                webGLAttrs->setAntialias(jsAttrs->get(exec, antialias).toBoolean(exec));
            Identifier premultipliedAlpha(exec, "premultipliedAlpha");
            if (jsAttrs->hasProperty(exec, premultipliedAlpha))
                webGLAttrs->setPremultipliedAlpha(jsAttrs->get(exec, premultipliedAlpha).toBoolean(exec));
            Identifier preserveDrawingBuffer(exec, "preserveDrawingBuffer");
            if (jsAttrs->hasProperty(exec, preserveDrawingBuffer))
                webGLAttrs->setPreserveDrawingBuffer(jsAttrs->get(exec, preserveDrawingBuffer).toBoolean(exec));
        }
    }
#endif
    CanvasRenderingContext* context = canvas->getContext(ustringToString(contextId), attrs.get());
    if (!context)
        return jsNull();
    JSValue jsValue = toJS(exec, globalObject(), WTF::getPtr(context));
#if ENABLE(WEBGL)
    if (context->is3d() && InspectorInstrumentation::hasFrontends()) {
        ScriptObject glContext(exec, jsValue.getObject());
        ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(canvas->document(), glContext);
        if (!wrapped.hasNoValue())
            return wrapped.jsValue();
    }
#endif
    return jsValue;
}

JSValue* JSHTMLCanvasElementPrototypeFunction::callAsFunction(ExecState* exec, JSObject* thisObj, const List& args)
{
    if (!thisObj->inherits(&JSHTMLCanvasElement::info))
      return throwError(exec, TypeError);

    HTMLCanvasElement* imp = static_cast<HTMLCanvasElement*>(static_cast<JSHTMLCanvasElement*>(thisObj)->impl());

    switch (id) {
    case JSHTMLCanvasElement::GetContextFuncNum: {
        String contextId = args[0]->toString(exec);


        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->getContext(contextId)));
        return result;
    }
    }
    return 0;
}

v8::Handle<v8::Value> V8HTMLCanvasElement::getContextCallback(const v8::Arguments& args)
{
    INC_STATS("DOM.HTMLCanvasElement.context");
    v8::Handle<v8::Object> holder = args.Holder();
    HTMLCanvasElement* imp = V8HTMLCanvasElement::toNative(holder);
    String contextId = toWebCoreString(args[0]);
    RefPtr<CanvasContextAttributes> attrs;
#if ENABLE(3D_CANVAS)
    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
        attrs = WebGLContextAttributes::create();
        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
        if (args.Length() > 1 && args[1]->IsObject()) {
            v8::Handle<v8::Object> jsAttrs = args[1]->ToObject();
            v8::Handle<v8::String> alpha = v8::String::New("alpha");
            if (jsAttrs->Has(alpha))
                webGLAttrs->setAlpha(jsAttrs->Get(alpha)->BooleanValue());
            v8::Handle<v8::String> depth = v8::String::New("depth");
            if (jsAttrs->Has(depth))
                webGLAttrs->setDepth(jsAttrs->Get(depth)->BooleanValue());
            v8::Handle<v8::String> stencil = v8::String::New("stencil");
            if (jsAttrs->Has(stencil))
                webGLAttrs->setStencil(jsAttrs->Get(stencil)->BooleanValue());
            v8::Handle<v8::String> antialias = v8::String::New("antialias");
            if (jsAttrs->Has(antialias))
                webGLAttrs->setAntialias(jsAttrs->Get(antialias)->BooleanValue());
            v8::Handle<v8::String> premultipliedAlpha = v8::String::New("premultipliedAlpha");
            if (jsAttrs->Has(premultipliedAlpha))
                webGLAttrs->setPremultipliedAlpha(jsAttrs->Get(premultipliedAlpha)->BooleanValue());
        }
    }
#endif
    CanvasRenderingContext* result = imp->getContext(contextId, attrs.get());
    if (!result)
        return v8::Null();
    if (result->is2d())
        return toV8(static_cast<CanvasRenderingContext2D*>(result));
#if ENABLE(3D_CANVAS)
    else if (result->is3d())
        return toV8(static_cast<WebGLRenderingContext*>(result));
#endif
    ASSERT_NOT_REACHED();
    return v8::Null();
}

void CocoDeviceWrapper::StateHandler(android_app* app, int32_t state)
{
	CocoDeviceWrapper* t = (CocoDeviceWrapper*)app->userData;
	switch(state)
	{
		case APP_CMD_INIT_WINDOW:
		{
			t->glwrap = new CocoDeviceOpenGLContext(app->window, t);
			global = window = new HTMLWindow();
			window->innerWidth = t->glwrap->GetScreen().width;
			window->innerHeight = t->glwrap->GetScreen().height;
			window->devicePixelRatio = t->glwrap->GetScreen().pixelRatio;

			window->deviceRotation = 0.0f;
			document = new HTMLDocument();
			HTMLCanvasElement* canvas = document->createElement("canvas");
			gl = (WebGLRenderingContext*)canvas->getContext("webgl");
			gl->canvas->width = window->innerWidth;
			gl->canvas->height = window->innerHeight;
			engine = new GameEngine();
			break;
		}
		case APP_CMD_WINDOW_REDRAW_NEEDED:
			break;
		case APP_CMD_TERM_WINDOW:
			delete t->glwrap;
			t->glwrap = nullptr;
			break;
		case APP_CMD_GAINED_FOCUS:
			break;
		case APP_CMD_LOST_FOCUS:
			break;
		case APP_CMD_STOP:
			ANativeActivity_finish(app->activity);
			break;
		default:
			break;
	}
}

v8::Handle<v8::Value> V8HTMLCanvasElement::getContextCallback(const v8::Arguments& args)
{
    INC_STATS("DOM.HTMLCanvasElement.context");
    v8::Handle<v8::Object> holder = args.Holder();
    HTMLCanvasElement* imp = V8HTMLCanvasElement::toNative(holder);
    String contextId = toWebCoreString(args[0]);
    RefPtr<CanvasContextAttributes> attrs;
#if ENABLE(WEBGL)
    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
        attrs = WebGLContextAttributes::create();
        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
        if (args.Length() > 1 && args[1]->IsObject()) {
            v8::Handle<v8::Object> jsAttrs = args[1]->ToObject();
            v8::Handle<v8::String> alpha = v8::String::New("alpha");
            if (jsAttrs->Has(alpha))
                webGLAttrs->setAlpha(jsAttrs->Get(alpha)->BooleanValue());
            v8::Handle<v8::String> depth = v8::String::New("depth");
            if (jsAttrs->Has(depth))
                webGLAttrs->setDepth(jsAttrs->Get(depth)->BooleanValue());
            v8::Handle<v8::String> stencil = v8::String::New("stencil");
            if (jsAttrs->Has(stencil))
                webGLAttrs->setStencil(jsAttrs->Get(stencil)->BooleanValue());
            v8::Handle<v8::String> antialias = v8::String::New("antialias");
            if (jsAttrs->Has(antialias))
                webGLAttrs->setAntialias(jsAttrs->Get(antialias)->BooleanValue());
            v8::Handle<v8::String> premultipliedAlpha = v8::String::New("premultipliedAlpha");
            if (jsAttrs->Has(premultipliedAlpha))
                webGLAttrs->setPremultipliedAlpha(jsAttrs->Get(premultipliedAlpha)->BooleanValue());
            v8::Handle<v8::String> preserveDrawingBuffer = v8::String::New("preserveDrawingBuffer");
            if (jsAttrs->Has(preserveDrawingBuffer))
                webGLAttrs->setPreserveDrawingBuffer(jsAttrs->Get(preserveDrawingBuffer)->BooleanValue());
        }
    }
#endif
    CanvasRenderingContext* result = imp->getContext(contextId, attrs.get());
    if (!result)
        return v8::Null(args.GetIsolate());
    else if (result->is2d()) {
        v8::Handle<v8::Value> v8Result = toV8(static_cast<CanvasRenderingContext2D*>(result), args.Holder(), args.GetIsolate());
        if (InspectorInstrumentation::canvasAgentEnabled(imp->document())) {
            ScriptState* scriptState = ScriptState::forContext(v8::Context::GetCurrent());
            ScriptObject context(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
            ScriptObject wrapped = InspectorInstrumentation::wrapCanvas2DRenderingContextForInstrumentation(imp->document(), context);
            if (!wrapped.hasNoValue())
                return wrapped.v8Value();
        }
        return v8Result;
    }
#if ENABLE(WEBGL)
    else if (result->is3d()) {
        // 3D canvas contexts can hold on to lots of GPU resources, and we want to take an
        // opportunity to get rid of them as soon as possible when we navigate away from pages using
        // them.
        V8PerIsolateData* perIsolateData = V8PerIsolateData::from(args.GetIsolate());
        perIsolateData->setShouldCollectGarbageSoon();

        v8::Handle<v8::Value> v8Result = toV8(static_cast<WebGLRenderingContext*>(result), args.Holder(), args.GetIsolate());
        if (InspectorInstrumentation::canvasAgentEnabled(imp->document())) {
            ScriptState* scriptState = ScriptState::forContext(v8::Context::GetCurrent());
            ScriptObject glContext(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
            ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(imp->document(), glContext);
            if (!wrapped.hasNoValue())
                return wrapped.v8Value();
        }
        return v8Result;
    }
#endif
    ASSERT_NOT_REACHED();
    return v8::Null(args.GetIsolate());
}