Image* HTMLCanvasElement::copiedImage() const
{
if (!m_copiedImage && buffer()) {
if (m_context && m_context->is3d()) {
toWebGLRenderingContext(m_context.get())->setSavingImage(true);
m_context->paintRenderingResultsToCanvas();
toWebGLRenderingContext(m_context.get())->setSavingImage(false);
}
m_copiedImage = buffer()->copyImage(CopyBackingStore, Unscaled);
updateExternallyAllocatedMemory();
}
return m_copiedImage.get();
}
void HTMLCanvasElement::paint(GraphicsContext* context, const LayoutRect& r)
{
if (m_context) {
if (!paintsIntoCanvasBuffer())
return;
m_context->paintRenderingResultsToCanvas();
}
if (hasImageBuffer()) {
ImageBuffer* imageBuffer = buffer();
if (imageBuffer) {
CompositeOperator compositeOperator = !m_context || m_context->hasAlpha() ? CompositeSourceOver : CompositeCopy;
if (m_presentedImage)
context->drawImage(m_presentedImage.get(), pixelSnappedIntRect(r), compositeOperator, DoNotRespectImageOrientation);
else
context->drawImageBuffer(imageBuffer, pixelSnappedIntRect(r), 0, compositeOperator);
}
} else {
// When alpha is false, we should draw to opaque black.
if (m_context && !m_context->hasAlpha())
context->fillRect(FloatRect(r), Color(0, 0, 0));
}
if (is3D())
toWebGLRenderingContext(m_context.get())->markLayerComposited();
}
void HTMLCanvasElement::reset()
{
if (m_ignoreReset)
return;
resetDirtyRect();
bool ok;
bool hadImageBuffer = hasImageBuffer();
int w = getAttribute(widthAttr).toInt(&ok);
if (!ok || w < 0)
w = DefaultWidth;
int h = getAttribute(heightAttr).toInt(&ok);
if (!ok || h < 0)
h = DefaultHeight;
if (m_contextStateSaver) {
// Reset to the initial graphics context state.
m_contextStateSaver->restore();
m_contextStateSaver->save();
}
if (m_context && m_context->is2d())
toCanvasRenderingContext2D(m_context.get())->reset();
IntSize oldSize = size();
IntSize newSize(w, h);
// If the size of an existing buffer matches, we can just clear it instead of reallocating.
// This optimization is only done for 2D canvases for now.
if (hadImageBuffer && oldSize == newSize && m_context && m_context->is2d()) {
if (!m_didClearImageBuffer)
clearImageBuffer();
return;
}
setSurfaceSize(newSize);
if (m_context && m_context->is3d() && oldSize != size())
toWebGLRenderingContext(m_context.get())->reshape(width(), height());
if (RenderObject* renderer = this->renderer()) {
if (renderer->isCanvas()) {
if (oldSize != size()) {
toRenderHTMLCanvas(renderer)->canvasSizeChanged();
if (renderBox() && renderBox()->hasAcceleratedCompositing())
renderBox()->contentChanged(CanvasChanged);
}
if (hadImageBuffer)
renderer->setShouldDoFullPaintInvalidation(true);
}
}
WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator end = m_observers.end();
for (WillBeHeapHashSet<RawPtrWillBeWeakMember<CanvasObserver> >::iterator it = m_observers.begin(); it != end; ++it)
(*it)->canvasResized(this);
}
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);
}
String HTMLCanvasElement::toDataURLInternal(const String& mimeType, const double* quality, bool isSaving) const
{
if (m_size.isEmpty() || !buffer())
return String("data:,");
String encodingMimeType = toEncodingMimeType(mimeType);
// Try to get ImageData first, as that may avoid lossy conversions.
RefPtr<ImageData> imageData = getImageData();
if (imageData)
return ImageDataToDataURL(ImageDataBuffer(imageData->size(), imageData->data()), encodingMimeType, quality);
if (m_context && m_context->is3d()) {
toWebGLRenderingContext(m_context.get())->setSavingImage(isSaving);
m_context->paintRenderingResultsToCanvas();
toWebGLRenderingContext(m_context.get())->setSavingImage(false);
}
return buffer()->toDataURL(encodingMimeType, quality);
}
PassRefPtr<ImageData> HTMLCanvasElement::getImageData() const
{
if (!m_context || !m_context->is3d())
return nullptr;
return toWebGLRenderingContext(m_context.get())->paintRenderingResultsToImageData();
}