215 lines
6.7 KiB
C++
215 lines
6.7 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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#pragma once
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#if ENABLE(OFFSCREEN_CANVAS)
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#include "AffineTransform.h"
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#include "CanvasBase.h"
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#include "ContextDestructionObserver.h"
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#include "EventTarget.h"
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#include "ExceptionOr.h"
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#include "IDLTypes.h"
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#include "ImageBuffer.h"
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#include "ImageBufferPipe.h"
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#include "IntSize.h"
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#include "ScriptWrappable.h"
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#include <wtf/Forward.h>
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#include <wtf/RefCounted.h>
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#include <wtf/ThreadSafeRefCounted.h>
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#include <wtf/WeakPtr.h>
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#include <wtf/text/WTFString.h>
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#if ENABLE(WEBGL)
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#include "WebGLContextAttributes.h"
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#endif
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namespace WebCore {
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class CanvasRenderingContext;
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class CSSValuePool;
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class DeferredPromise;
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class HTMLCanvasElement;
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class ImageBitmap;
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class ImageData;
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class OffscreenCanvasRenderingContext2D;
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class WebGL2RenderingContext;
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class WebGLRenderingContext;
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class WebGLRenderingContextBase;
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using OffscreenRenderingContext = Variant<
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#if ENABLE(WEBGL)
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RefPtr<WebGLRenderingContext>,
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#endif
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#if ENABLE(WEBGL2)
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RefPtr<WebGL2RenderingContext>,
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#endif
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RefPtr<OffscreenCanvasRenderingContext2D>
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>;
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class DetachedOffscreenCanvas {
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WTF_MAKE_NONCOPYABLE(DetachedOffscreenCanvas);
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WTF_MAKE_FAST_ALLOCATED;
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friend class OffscreenCanvas;
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public:
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DetachedOffscreenCanvas(RefPtr<ImageBuffer>&&, const IntSize&, bool originClean);
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RefPtr<ImageBuffer> takeImageBuffer();
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const IntSize& size() const { return m_size; }
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bool originClean() const { return m_originClean; }
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size_t memoryCost() const
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{
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auto* buffer = m_buffer.get();
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if (buffer)
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return buffer->memoryCost();
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return 0;
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}
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WeakPtr<HTMLCanvasElement> takePlaceholderCanvas();
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private:
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RefPtr<ImageBuffer> m_buffer;
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IntSize m_size;
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bool m_originClean;
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WeakPtr<HTMLCanvasElement> m_placeholderCanvas;
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};
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class OffscreenCanvas final : public RefCounted<OffscreenCanvas>, public CanvasBase, public EventTargetWithInlineData, private ContextDestructionObserver {
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WTF_MAKE_ISO_ALLOCATED(OffscreenCanvas);
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public:
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struct ImageEncodeOptions {
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String type = "image/png";
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double quality = 1.0;
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};
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enum class RenderingContextType {
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_2d,
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Webgl,
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Webgl2
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};
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static bool enabledForContext(ScriptExecutionContext&);
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static Ref<OffscreenCanvas> create(ScriptExecutionContext&, unsigned width, unsigned height);
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static Ref<OffscreenCanvas> create(ScriptExecutionContext&, std::unique_ptr<DetachedOffscreenCanvas>&&);
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static Ref<OffscreenCanvas> create(ScriptExecutionContext&, HTMLCanvasElement&);
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virtual ~OffscreenCanvas();
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unsigned width() const final;
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unsigned height() const final;
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void setWidth(unsigned);
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void setHeight(unsigned);
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CanvasRenderingContext* renderingContext() const final { return m_context.get(); }
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ExceptionOr<std::optional<OffscreenRenderingContext>> getContext(JSC::JSGlobalObject&, RenderingContextType, Vector<JSC::Strong<JSC::Unknown>>&& arguments);
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ExceptionOr<RefPtr<ImageBitmap>> transferToImageBitmap();
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void convertToBlob(ImageEncodeOptions&&, Ref<DeferredPromise>&&);
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void didDraw(const std::optional<FloatRect>&) final;
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Image* copiedImage() const final;
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void clearCopiedImage() const final;
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bool hasCreatedImageBuffer() const final { return m_hasCreatedImageBuffer; }
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SecurityOrigin* securityOrigin() const final;
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bool canDetach() const;
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std::unique_ptr<DetachedOffscreenCanvas> detach();
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void commitToPlaceholderCanvas();
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CSSValuePool& cssValuePool();
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using RefCounted::ref;
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using RefCounted::deref;
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private:
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OffscreenCanvas(ScriptExecutionContext&, unsigned width, unsigned height);
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bool isOffscreenCanvas() const final { return true; }
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ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
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ScriptExecutionContext* canvasBaseScriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
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EventTargetInterface eventTargetInterface() const final { return OffscreenCanvasEventTargetInterfaceType; }
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void refEventTarget() final { ref(); }
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void derefEventTarget() final { deref(); }
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void refCanvasBase() final { ref(); }
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void derefCanvasBase() final { deref(); }
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void setSize(const IntSize&) final;
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#if ENABLE(WEBGL)
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void createContextWebGL(RenderingContextType, WebGLContextAttributes&& = { });
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#endif
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void createImageBuffer() const final;
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RefPtr<ImageBuffer> takeImageBuffer() const;
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void reset();
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void setPlaceholderCanvas(HTMLCanvasElement&);
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void pushBufferToPlaceholder();
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void scheduleCommitToPlaceholderCanvas();
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std::unique_ptr<CanvasRenderingContext> m_context;
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// m_hasCreatedImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
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mutable bool m_hasCreatedImageBuffer { false };
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bool m_detached { false };
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mutable RefPtr<Image> m_copiedImage;
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bool m_hasScheduledCommit { false };
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class PlaceholderData : public ThreadSafeRefCounted<PlaceholderData> {
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public:
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static Ref<PlaceholderData> create()
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{
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return adoptRef(*new PlaceholderData);
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}
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WeakPtr<HTMLCanvasElement> canvas;
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RefPtr<ImageBufferPipe::Source> bufferPipeSource;
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RefPtr<ImageBuffer> pendingCommitBuffer;
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mutable Lock bufferLock;
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};
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RefPtr<PlaceholderData> m_placeholderData;
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};
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}
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SPECIALIZE_TYPE_TRAITS_CANVAS(WebCore::OffscreenCanvas, isOffscreenCanvas())
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#endif
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