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/*
* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include "FloatRect.h"
#include "HTMLElement.h"
#include "IntSize.h"
#include <memory>
#include <wtf/Forward.h>
#include <wtf/HashSet.h>
#if ENABLE(WEBGL)
#include "WebGLContextAttributes.h"
#endif
namespace WebCore {
class BlobCallback;
class CanvasRenderingContext2D;
class CanvasRenderingContext;
class GraphicsContext;
class GraphicsContextStateSaver;
class HTMLCanvasElement;
class Image;
class ImageBuffer;
class ImageData;
class MediaSample;
class MediaStream;
class WebGLRenderingContextBase;
class WebGPURenderingContext;
struct UncachedString;
namespace DisplayList {
using AsTextFlags = unsigned;
}
class CanvasObserver {
public:
virtual ~CanvasObserver() { }
virtual bool isCanvasObserverProxy() const { return false; }
virtual void canvasChanged(HTMLCanvasElement&, const FloatRect& changedRect) = 0;
virtual void canvasResized(HTMLCanvasElement&) = 0;
virtual void canvasDestroyed(HTMLCanvasElement&) = 0;
};
class HTMLCanvasElement final : public HTMLElement {
public:
static Ref<HTMLCanvasElement> create(Document&);
static Ref<HTMLCanvasElement> create(const QualifiedName&, Document&);
virtual ~HTMLCanvasElement();
void addObserver(CanvasObserver&);
void removeObserver(CanvasObserver&);
HashSet<Element*> cssCanvasClients() const;
unsigned width() const { return size().width(); }
unsigned height() const { return size().height(); }
const IntSize& size() const { return m_size; }
WEBCORE_EXPORT void setWidth(unsigned);
WEBCORE_EXPORT void setHeight(unsigned);
void setSize(const IntSize& newSize)
{
if (newSize == size())
return;
m_ignoreReset = true;
setWidth(newSize.width());
setHeight(newSize.height());
m_ignoreReset = false;
reset();
}
ExceptionOr<std::optional<RenderingContext>> getContext(JSC::ExecState&, const String& contextId, Vector<JSC::Strong<JSC::Unknown>>&& arguments);
CanvasRenderingContext* getContext(const String&);
static bool is2dType(const String&);
CanvasRenderingContext2D* getContext2d(const String&);
#if ENABLE(WEBGL)
static bool is3dType(const String&);
WebGLRenderingContextBase* getContextWebGL(const String&, WebGLContextAttributes&& = { });
#endif
#if ENABLE(WEBGPU)
static bool isWebGPUType(const String&);
WebGPURenderingContext* getContextWebGPU(const String&);
#endif
WEBCORE_EXPORT ExceptionOr<UncachedString> toDataURL(const String& mimeType, JSC::JSValue quality);
WEBCORE_EXPORT ExceptionOr<UncachedString> toDataURL(const String& mimeType);
ExceptionOr<void> toBlob(ScriptExecutionContext&, Ref<BlobCallback>&&, const String& mimeType, JSC::JSValue quality);
// Used for rendering
void didDraw(const FloatRect&);
void notifyObserversCanvasChanged(const FloatRect&);
void paint(GraphicsContext&, const LayoutRect&);
GraphicsContext* drawingContext() const;
GraphicsContext* existingDrawingContext() const;
CanvasRenderingContext* renderingContext() const { return m_context.get(); }
#if ENABLE(MEDIA_STREAM)
RefPtr<MediaSample> toMediaSample();
ExceptionOr<Ref<MediaStream>> captureStream(ScriptExecutionContext&, std::optional<double>&& frameRequestRate);
#endif
ImageBuffer* buffer() const;
Image* copiedImage() const;
void clearCopiedImage();
RefPtr<ImageData> getImageData();
void makePresentationCopy();
void clearPresentationCopy();
SecurityOrigin* securityOrigin() const;
void setOriginTainted() { m_originClean = false; }
bool originClean() const { return m_originClean; }
AffineTransform baseTransform() const;
void makeRenderingResultsAvailable();
bool hasCreatedImageBuffer() const { return m_hasCreatedImageBuffer; }
bool shouldAccelerate(const IntSize&) const;
WEBCORE_EXPORT void setUsesDisplayListDrawing(bool);
WEBCORE_EXPORT void setTracksDisplayListReplay(bool);
WEBCORE_EXPORT String displayListAsText(DisplayList::AsTextFlags) const;
WEBCORE_EXPORT String replayDisplayListAsText(DisplayList::AsTextFlags) const;
size_t memoryCost() const;
size_t externalMemoryCost() const;
private:
HTMLCanvasElement(const QualifiedName&, Document&);
void parseAttribute(const QualifiedName&, const AtomicString&) final;
RenderPtr<RenderElement> createElementRenderer(RenderStyle&&, const RenderTreePosition&) final;
bool canContainRangeEndPoint() const final;
bool canStartSelection() const final;
void reset();
void createImageBuffer() const;
void clearImageBuffer() const;
void setSurfaceSize(const IntSize&);
void setImageBuffer(std::unique_ptr<ImageBuffer>) const;
void releaseImageBufferAndContext();
bool paintsIntoCanvasBuffer() const;
bool isGPUBased() const;
HashSet<CanvasObserver*> m_observers;
std::unique_ptr<CanvasRenderingContext> m_context;
FloatRect m_dirtyRect;
IntSize m_size;
bool m_originClean { true };
bool m_ignoreReset { false };
bool m_usesDisplayListDrawing { false };
bool m_tracksDisplayListReplay { false };
mutable Lock m_imageBufferAssignmentLock;
// m_createdImageBuffer means we tried to malloc the buffer. We didn't necessarily get it.
mutable bool m_hasCreatedImageBuffer { false };
mutable bool m_didClearImageBuffer { false };
mutable std::unique_ptr<ImageBuffer> m_imageBuffer;
mutable std::unique_ptr<GraphicsContextStateSaver> m_contextStateSaver;
mutable RefPtr<Image> m_presentedImage;
mutable RefPtr<Image> m_copiedImage; // FIXME: This is temporary for platforms that have to copy the image buffer to render (and for CSSCanvasValue).
};
} // namespace WebCore
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