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/*
* Copyright (C) 2007-2009 Google Inc. All rights reserved.
* Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "V8HTMLCanvasElement.h"
#include "CanvasContextAttributes.h"
#include "CanvasRenderingContext.h"
#include "HTMLCanvasElement.h"
#include "InspectorCanvasInstrumentation.h"
#include "WebGLContextAttributes.h"
#include "V8Binding.h"
#include "V8CanvasRenderingContext2D.h"
#include "V8Node.h"
#if ENABLE(WEBGL)
#include "V8WebGLRenderingContext.h"
#endif
#include <wtf/MathExtras.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
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());
}
v8::Handle<v8::Value> V8HTMLCanvasElement::toDataURLCallback(const v8::Arguments& args)
{
v8::Handle<v8::Object> holder = args.Holder();
HTMLCanvasElement* canvas = V8HTMLCanvasElement::toNative(holder);
ExceptionCode ec = 0;
String type = toWebCoreString(args[0]);
double quality;
double* qualityPtr = 0;
if (args.Length() > 1 && args[1]->IsNumber()) {
quality = args[1]->NumberValue();
qualityPtr = &quality;
}
String result = canvas->toDataURL(type, qualityPtr, ec);
setDOMException(ec, args.GetIsolate());
return v8StringOrUndefined(result, args.GetIsolate());
}
} // namespace WebCore
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