void HTMLCanvasElement::notifySurfaceInvalid()
{
if (m_context && m_context->is2d()) {
CanvasRenderingContext2D* context2d = toCanvasRenderingContext2D(m_context.get());
context2d->loseContext();
}
}
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);
}
void HTMLCanvasElement::setSurfaceSize(const IntSize& size)
{
m_size = size;
m_didFailToCreateImageBuffer = false;
discardImageBuffer();
clearCopiedImage();
if (m_context && m_context->is2d()) {
CanvasRenderingContext2D* context2d = toCanvasRenderingContext2D(m_context.get());
if (context2d->isContextLost()) {
context2d->restoreContext();
}
}
}
void HTMLCanvasElement::clearImageBuffer()
{
ASSERT(hasImageBuffer() && !m_didFailToCreateImageBuffer);
ASSERT(!m_didClearImageBuffer);
ASSERT(m_context);
m_didClearImageBuffer = true;
if (m_context->is2d()) {
// No need to undo transforms/clip/etc. because we are called right
// after the context is reset.
toCanvasRenderingContext2D(m_context.get())->clearRect(0, 0, width(), height());
}
}
// Verifies that ImageBitmaps constructed from ImageBitmaps hold onto their own Image.
TEST_F(ImageBitmapTest, ImageResourceLifetime)
{
RefPtr<HTMLCanvasElement> canvasElement = HTMLCanvasElement::create(*Document::create().get());
canvasElement->setHeight(40);
canvasElement->setWidth(40);
RefPtrWillBeRawPtr<ImageBitmap> imageBitmapDerived = nullptr;
{
RefPtrWillBeRawPtr<ImageBitmap> imageBitmapFromCanvas = ImageBitmap::create(canvasElement.get(), IntRect(0, 0, canvasElement->width(), canvasElement->height()));
imageBitmapDerived = ImageBitmap::create(imageBitmapFromCanvas.get(), IntRect(0, 0, 20, 20));
}
CanvasRenderingContext* context = canvasElement->getContext("2d");
TrackExceptionState exceptionState;
toCanvasRenderingContext2D(context)->drawImage(imageBitmapDerived.get(), 0, 0, exceptionState);
}
void HTMLCanvasElement::createImageBuffer()
{
createImageBufferInternal();
if (m_didFailToCreateImageBuffer && m_context && m_context->is2d())
toCanvasRenderingContext2D(m_context.get())->loseContext();
}