526 lines
18 KiB
C++
526 lines
18 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "OffscreenCanvas.h"
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#if ENABLE(OFFSCREEN_CANVAS)
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#include "CSSValuePool.h"
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#include "CanvasRenderingContext.h"
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#include "Document.h"
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#include "HTMLCanvasElement.h"
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#include "ImageBitmap.h"
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#include "ImageData.h"
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#include "JSBlob.h"
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#include "JSDOMPromiseDeferred.h"
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#include "MIMETypeRegistry.h"
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#include "OffscreenCanvasRenderingContext2D.h"
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#include "PlaceholderRenderingContext.h"
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#include "RuntimeEnabledFeatures.h"
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#include "WorkerGlobalScope.h"
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#include <wtf/IsoMallocInlines.h>
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#if ENABLE(WEBGL)
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#include "Settings.h"
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#include "WebGLRenderingContext.h"
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#if ENABLE(WEBGL2)
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#include "WebGL2RenderingContext.h"
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#endif
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#endif // ENABLE(WEBGL)
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(OffscreenCanvas);
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DetachedOffscreenCanvas::DetachedOffscreenCanvas(RefPtr<ImageBuffer>&& buffer, const IntSize& size, bool originClean)
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: m_buffer(WTFMove(buffer))
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, m_size(size)
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, m_originClean(originClean)
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{
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}
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RefPtr<ImageBuffer> DetachedOffscreenCanvas::takeImageBuffer()
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{
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return WTFMove(m_buffer);
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}
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WeakPtr<HTMLCanvasElement> DetachedOffscreenCanvas::takePlaceholderCanvas()
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{
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ASSERT(isMainThread());
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return std::exchange(m_placeholderCanvas, nullptr);
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}
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bool OffscreenCanvas::enabledForContext(ScriptExecutionContext& context)
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{
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#if ENABLE(OFFSCREEN_CANVAS_IN_WORKERS)
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if (context.isWorkerGlobalScope())
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return RuntimeEnabledFeatures::sharedFeatures().offscreenCanvasInWorkersEnabled();
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#endif
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ASSERT(context.isDocument());
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return true;
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}
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Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, unsigned width, unsigned height)
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{
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return adoptRef(*new OffscreenCanvas(scriptExecutionContext, width, height));
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}
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Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, std::unique_ptr<DetachedOffscreenCanvas>&& detachedCanvas)
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{
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Ref<OffscreenCanvas> clone = adoptRef(*new OffscreenCanvas(scriptExecutionContext, detachedCanvas->size().width(), detachedCanvas->size().height()));
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clone->setImageBuffer(detachedCanvas->takeImageBuffer());
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if (!detachedCanvas->originClean())
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clone->setOriginTainted();
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callOnMainThread([detachedCanvas = WTFMove(detachedCanvas), placeholderData = makeRef(*clone->m_placeholderData)] () mutable {
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placeholderData->canvas = detachedCanvas->takePlaceholderCanvas();
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if (placeholderData->canvas) {
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auto& placeholderContext = downcast<PlaceholderRenderingContext>(*placeholderData->canvas->renderingContext());
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auto& imageBufferPipe = placeholderContext.imageBufferPipe();
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if (imageBufferPipe)
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placeholderData->bufferPipeSource = imageBufferPipe->source();
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}
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});
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return clone;
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}
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Ref<OffscreenCanvas> OffscreenCanvas::create(ScriptExecutionContext& scriptExecutionContext, HTMLCanvasElement& canvas)
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{
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auto offscreen = adoptRef(*new OffscreenCanvas(scriptExecutionContext, canvas.width(), canvas.height()));
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offscreen->setPlaceholderCanvas(canvas);
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return offscreen;
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}
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OffscreenCanvas::OffscreenCanvas(ScriptExecutionContext& scriptExecutionContext, unsigned width, unsigned height)
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: CanvasBase(IntSize(width, height))
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, ContextDestructionObserver(&scriptExecutionContext)
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, m_placeholderData(PlaceholderData::create())
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{
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}
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OffscreenCanvas::~OffscreenCanvas()
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{
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notifyObserversCanvasDestroyed();
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m_context = nullptr; // Ensure this goes away before the ImageBuffer.
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setImageBuffer(nullptr);
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}
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unsigned OffscreenCanvas::width() const
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{
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if (m_detached)
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return 0;
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return CanvasBase::width();
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}
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unsigned OffscreenCanvas::height() const
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{
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if (m_detached)
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return 0;
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return CanvasBase::height();
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}
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void OffscreenCanvas::setWidth(unsigned newWidth)
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{
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if (m_detached)
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return;
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setSize(IntSize(newWidth, height()));
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}
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void OffscreenCanvas::setHeight(unsigned newHeight)
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{
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if (m_detached)
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return;
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setSize(IntSize(width(), newHeight));
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}
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void OffscreenCanvas::setSize(const IntSize& newSize)
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{
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CanvasBase::setSize(newSize);
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reset();
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}
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#if ENABLE(WEBGL)
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static bool requiresAcceleratedCompositingForWebGL()
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{
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#if PLATFORM(GTK) || PLATFORM(WIN_CAIRO)
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return false;
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#else
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return true;
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#endif
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}
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static bool shouldEnableWebGL(bool webGLEnabled, bool acceleratedCompositingEnabled)
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{
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if (!webGLEnabled)
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return false;
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if (!requiresAcceleratedCompositingForWebGL())
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return true;
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return acceleratedCompositingEnabled;
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}
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void OffscreenCanvas::createContextWebGL(RenderingContextType contextType, WebGLContextAttributes&& attrs)
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{
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ASSERT(!m_context);
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auto scriptExecutionContext = this->scriptExecutionContext();
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if (scriptExecutionContext->isWorkerGlobalScope()) {
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WorkerGlobalScope& workerGlobalScope = downcast<WorkerGlobalScope>(*scriptExecutionContext);
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if (!shouldEnableWebGL(workerGlobalScope.settingsValues().webGLEnabled, workerGlobalScope.settingsValues().acceleratedCompositingEnabled))
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return;
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} else if (scriptExecutionContext->isDocument()) {
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auto& settings = downcast<Document>(*scriptExecutionContext).settings();
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if (!shouldEnableWebGL(settings.webGLEnabled(), settings.acceleratedCompositingEnabled()))
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return;
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} else
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return;
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GraphicsContextGLWebGLVersion webGLVersion = GraphicsContextGLWebGLVersion::WebGL1;
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#if ENABLE(WEBGL2)
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webGLVersion = (contextType == RenderingContextType::Webgl) ? GraphicsContextGLWebGLVersion::WebGL1 : GraphicsContextGLWebGLVersion::WebGL2;
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#else
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UNUSED_PARAM(contextType);
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#endif
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m_context = WebGLRenderingContextBase::create(*this, attrs, webGLVersion);
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}
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#endif // ENABLE(WEBGL)
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ExceptionOr<std::optional<OffscreenRenderingContext>> OffscreenCanvas::getContext(JSC::JSGlobalObject& state, RenderingContextType contextType, Vector<JSC::Strong<JSC::Unknown>>&& arguments)
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{
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if (m_detached)
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return Exception { InvalidStateError };
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if (contextType == RenderingContextType::_2d) {
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if (m_context) {
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if (!is<OffscreenCanvasRenderingContext2D>(*m_context))
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return { { std::nullopt } };
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return { { RefPtr<OffscreenCanvasRenderingContext2D> { &downcast<OffscreenCanvasRenderingContext2D>(*m_context) } } };
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}
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auto scope = DECLARE_THROW_SCOPE(state.vm());
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auto settings = convert<IDLDictionary<CanvasRenderingContext2DSettings>>(state, arguments.isEmpty() ? JSC::jsUndefined() : (arguments[0].isObject() ? arguments[0].get() : JSC::jsNull()));
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RETURN_IF_EXCEPTION(scope, Exception { ExistingExceptionError });
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m_context = makeUnique<OffscreenCanvasRenderingContext2D>(*this, WTFMove(settings));
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if (!m_context)
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return { { std::nullopt } };
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return { { RefPtr<OffscreenCanvasRenderingContext2D> { &downcast<OffscreenCanvasRenderingContext2D>(*m_context) } } };
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}
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#if ENABLE(WEBGL)
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else {
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if (m_context) {
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if (is<WebGLRenderingContext>(*m_context))
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return { { RefPtr<WebGLRenderingContext> { &downcast<WebGLRenderingContext>(*m_context) } } };
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#if ENABLE(WEBGL2)
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if (is<WebGL2RenderingContext>(*m_context))
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return { { RefPtr<WebGL2RenderingContext> { &downcast<WebGL2RenderingContext>(*m_context) } } };
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#endif
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return { { std::nullopt } };
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}
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auto scope = DECLARE_THROW_SCOPE(state.vm());
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auto attributes = convert<IDLDictionary<WebGLContextAttributes>>(state, arguments.isEmpty() ? JSC::jsUndefined() : (arguments[0].isObject() ? arguments[0].get() : JSC::jsNull()));
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RETURN_IF_EXCEPTION(scope, Exception { ExistingExceptionError });
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createContextWebGL(contextType, WTFMove(attributes));
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if (!m_context)
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return { { std::nullopt } };
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#if ENABLE(WEBGL2)
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if (is<WebGL2RenderingContext>(*m_context))
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return { { RefPtr<WebGL2RenderingContext> { &downcast<WebGL2RenderingContext>(*m_context) } } };
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#endif
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return { { RefPtr<WebGLRenderingContext> { &downcast<WebGLRenderingContext>(*m_context) } } };
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}
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#endif
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return Exception { TypeError };
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}
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ExceptionOr<RefPtr<ImageBitmap>> OffscreenCanvas::transferToImageBitmap()
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{
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if (m_detached || !m_context)
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return Exception { InvalidStateError };
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if (is<OffscreenCanvasRenderingContext2D>(*m_context)) {
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if (!width() || !height())
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return { RefPtr<ImageBitmap> { nullptr } };
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if (!m_hasCreatedImageBuffer) {
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auto buffer = ImageBitmap::createImageBuffer(*canvasBaseScriptExecutionContext(), size(), RenderingMode::Unaccelerated);
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return { ImageBitmap::create(ImageBitmapBacking(WTFMove(buffer))) };
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}
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// As the canvas context state is stored in GraphicsContext, which is owned
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// by buffer(), to avoid resetting the context state, we have to make a copy and
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// clear the original buffer rather than returning the original buffer.
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auto bufferCopy = buffer()->copyRectToBuffer(FloatRect(FloatPoint(), buffer()->logicalSize()), buffer()->colorSpace(), *drawingContext());
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downcast<OffscreenCanvasRenderingContext2D>(*m_context).clearCanvas();
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clearCopiedImage();
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return { ImageBitmap::create(ImageBitmapBacking(WTFMove(bufferCopy), originClean() ? SerializationState::OriginClean : SerializationState())) };
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}
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#if ENABLE(WEBGL)
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if (is<WebGLRenderingContext>(*m_context)) {
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auto webGLContext = &downcast<WebGLRenderingContext>(*m_context);
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// FIXME: We're supposed to create an ImageBitmap using the backing
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// store from this canvas (or its context), but for now we'll just
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// create a new bitmap and paint into it.
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auto imageBitmap = ImageBitmap::create(*canvasBaseScriptExecutionContext(), size());
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if (!imageBitmap->buffer())
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return { RefPtr<ImageBitmap> { nullptr } };
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auto* gc3d = webGLContext->graphicsContextGL();
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gc3d->paintRenderingResultsToCanvas(*imageBitmap->buffer());
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// FIXME: The transfer algorithm requires that the canvas effectively
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// creates a new backing store. Since we're not doing that yet, we
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// need to erase what's there.
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GCGLfloat clearColor[4] { };
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gc3d->getFloatv(GraphicsContextGL::COLOR_CLEAR_VALUE, clearColor);
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gc3d->clearColor(0, 0, 0, 0);
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gc3d->clear(GraphicsContextGL::COLOR_BUFFER_BIT | GraphicsContextGL::DEPTH_BUFFER_BIT | GraphicsContextGL::STENCIL_BUFFER_BIT);
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gc3d->clearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
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return { WTFMove(imageBitmap) };
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}
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#endif
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return Exception { NotSupportedError };
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}
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static String toEncodingMimeType(const String& mimeType)
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{
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if (!MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType))
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return "image/png"_s;
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return mimeType.convertToASCIILowercase();
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}
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static std::optional<double> qualityFromDouble(double qualityNumber)
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{
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if (!(qualityNumber >= 0 && qualityNumber <= 1))
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return std::nullopt;
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return qualityNumber;
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}
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void OffscreenCanvas::convertToBlob(ImageEncodeOptions&& options, Ref<DeferredPromise>&& promise)
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{
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if (!originClean()) {
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promise->reject(SecurityError);
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return;
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}
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if (size().isEmpty()) {
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promise->reject(IndexSizeError);
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return;
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}
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if (m_detached || !buffer()) {
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promise->reject(InvalidStateError);
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return;
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}
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makeRenderingResultsAvailable();
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auto encodingMIMEType = toEncodingMimeType(options.type);
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auto quality = qualityFromDouble(options.quality);
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Vector<uint8_t> blobData = buffer()->toData(encodingMIMEType, quality);
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if (blobData.isEmpty()) {
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promise->reject(EncodingError);
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return;
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}
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Ref<Blob> blob = Blob::create(canvasBaseScriptExecutionContext(), WTFMove(blobData), encodingMIMEType);
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promise->resolveWithNewlyCreated<IDLInterface<Blob>>(WTFMove(blob));
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}
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void OffscreenCanvas::didDraw(const std::optional<FloatRect>& rect)
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{
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clearCopiedImage();
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scheduleCommitToPlaceholderCanvas();
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notifyObserversCanvasChanged(rect);
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}
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Image* OffscreenCanvas::copiedImage() const
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{
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if (m_detached)
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return nullptr;
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if (!m_copiedImage && buffer()) {
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if (m_context)
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m_context->paintRenderingResultsToCanvas();
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m_copiedImage = buffer()->copyImage(CopyBackingStore, PreserveResolution::Yes);
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}
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return m_copiedImage.get();
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}
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void OffscreenCanvas::clearCopiedImage() const
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{
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m_copiedImage = nullptr;
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}
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SecurityOrigin* OffscreenCanvas::securityOrigin() const
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{
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auto& scriptExecutionContext = *canvasBaseScriptExecutionContext();
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if (is<WorkerGlobalScope>(scriptExecutionContext))
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return &downcast<WorkerGlobalScope>(scriptExecutionContext).topOrigin();
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return &downcast<Document>(scriptExecutionContext).securityOrigin();
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}
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bool OffscreenCanvas::canDetach() const
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{
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return !m_detached && !m_context;
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}
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std::unique_ptr<DetachedOffscreenCanvas> OffscreenCanvas::detach()
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{
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if (!canDetach())
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return nullptr;
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m_detached = true;
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auto detached = makeUnique<DetachedOffscreenCanvas>(takeImageBuffer(), size(), originClean());
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detached->m_placeholderCanvas = std::exchange(m_placeholderData->canvas, nullptr);
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return detached;
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}
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void OffscreenCanvas::setPlaceholderCanvas(HTMLCanvasElement& canvas)
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{
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ASSERT(!m_context);
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ASSERT(isMainThread());
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m_placeholderData->canvas = makeWeakPtr(canvas);
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auto& placeholderContext = downcast<PlaceholderRenderingContext>(*canvas.renderingContext());
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auto& imageBufferPipe = placeholderContext.imageBufferPipe();
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if (imageBufferPipe)
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m_placeholderData->bufferPipeSource = imageBufferPipe->source();
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}
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void OffscreenCanvas::pushBufferToPlaceholder()
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{
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callOnMainThread([placeholderData = makeRef(*m_placeholderData)] () mutable {
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Locker locker { placeholderData->bufferLock };
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if (placeholderData->canvas && placeholderData->pendingCommitBuffer)
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placeholderData->canvas->setImageBufferAndMarkDirty(WTFMove(placeholderData->pendingCommitBuffer));
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placeholderData->pendingCommitBuffer = nullptr;
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});
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}
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void OffscreenCanvas::commitToPlaceholderCanvas()
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{
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auto* imageBuffer = buffer();
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if (!imageBuffer)
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return;
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// FIXME: Transfer texture over if we're using accelerated compositing
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if (m_context && (m_context->isWebGL() || m_context->isAccelerated()))
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m_context->paintRenderingResultsToCanvas();
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if (m_placeholderData->bufferPipeSource) {
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auto bufferCopy = imageBuffer->copyRectToBuffer(FloatRect(FloatPoint(), imageBuffer->logicalSize()), DestinationColorSpace::SRGB(), imageBuffer->context());
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if (bufferCopy)
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m_placeholderData->bufferPipeSource->handle(WTFMove(bufferCopy));
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}
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Locker locker { m_placeholderData->bufferLock };
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bool shouldPushBuffer = !m_placeholderData->pendingCommitBuffer;
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m_placeholderData->pendingCommitBuffer = imageBuffer->copyRectToBuffer(FloatRect(FloatPoint(), imageBuffer->logicalSize()), DestinationColorSpace::SRGB(), imageBuffer->context());
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if (m_placeholderData->pendingCommitBuffer && shouldPushBuffer)
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pushBufferToPlaceholder();
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}
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void OffscreenCanvas::scheduleCommitToPlaceholderCanvas()
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{
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if (!m_hasScheduledCommit) {
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auto& scriptContext = *scriptExecutionContext();
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m_hasScheduledCommit = true;
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scriptContext.postTask([protectedThis = makeRef(*this), this] (ScriptExecutionContext&) {
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m_hasScheduledCommit = false;
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commitToPlaceholderCanvas();
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});
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}
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}
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CSSValuePool& OffscreenCanvas::cssValuePool()
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{
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auto* scriptExecutionContext = canvasBaseScriptExecutionContext();
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if (scriptExecutionContext->isWorkerGlobalScope())
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return downcast<WorkerGlobalScope>(*scriptExecutionContext).cssValuePool();
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ASSERT(scriptExecutionContext->isDocument());
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return CSSValuePool::singleton();
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}
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void OffscreenCanvas::createImageBuffer() const
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{
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m_hasCreatedImageBuffer = true;
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if (!width() || !height())
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return;
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setImageBuffer(ImageBitmap::createImageBuffer(*canvasBaseScriptExecutionContext(), size(), RenderingMode::Unaccelerated));
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}
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RefPtr<ImageBuffer> OffscreenCanvas::takeImageBuffer() const
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{
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ASSERT(m_detached);
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if (size().isEmpty())
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return nullptr;
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|
clearCopiedImage();
|
|
return setImageBuffer(nullptr);
|
|
}
|
|
|
|
void OffscreenCanvas::reset()
|
|
{
|
|
resetGraphicsContextState();
|
|
if (is<OffscreenCanvasRenderingContext2D>(m_context.get()))
|
|
downcast<OffscreenCanvasRenderingContext2D>(*m_context).reset();
|
|
|
|
m_hasCreatedImageBuffer = false;
|
|
setImageBuffer(nullptr);
|
|
clearCopiedImage();
|
|
|
|
notifyObserversCanvasResized();
|
|
scheduleCommitToPlaceholderCanvas();
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|