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/*
* Copyright (C) 2017-2023 Apple Inc. 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. AND ITS CONTRIBUTORS ``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 ITS 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
#if ENABLE(OFFSCREEN_CANVAS)
#include "ActiveDOMObject.h"
#include "AffineTransform.h"
#include "CanvasBase.h"
#include "ContextDestructionObserver.h"
#include "EventTarget.h"
#include "ExceptionOr.h"
#include "IDLTypes.h"
#include "ImageBuffer.h"
#include "IntSize.h"
#include "ScriptWrappable.h"
#include <wtf/FixedVector.h>
#include <wtf/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/WeakPtr.h>
#include <wtf/text/WTFString.h>
#if ENABLE(WEBGL)
#include "WebGLContextAttributes.h"
#endif
namespace WebCore {
class CanvasRenderingContext;
class DeferredPromise;
class GPU;
class GPUCanvasContext;
class HTMLCanvasElement;
class ImageBitmap;
class ImageBitmapRenderingContext;
class ImageData;
class OffscreenCanvasRenderingContext2D;
class WebGL2RenderingContext;
class WebGLRenderingContext;
class WebGLRenderingContextBase;
using OffscreenRenderingContext = std::variant<
#if ENABLE(WEBGL)
RefPtr<WebGLRenderingContext>,
RefPtr<WebGL2RenderingContext>,
#endif
RefPtr<GPUCanvasContext>,
RefPtr<ImageBitmapRenderingContext>,
RefPtr<OffscreenCanvasRenderingContext2D>
>;
class PlaceholderRenderingContext;
class PlaceholderRenderingContextSource;
class DetachedOffscreenCanvas {
WTF_MAKE_TZONE_ALLOCATED_EXPORT(DetachedOffscreenCanvas, WEBCORE_EXPORT);
WTF_MAKE_NONCOPYABLE(DetachedOffscreenCanvas);
friend class OffscreenCanvas;
public:
DetachedOffscreenCanvas(const IntSize&, bool originClean, RefPtr<PlaceholderRenderingContextSource>&&);
WEBCORE_EXPORT ~DetachedOffscreenCanvas();
const IntSize& size() const { return m_size; }
bool originClean() const { return m_originClean; }
RefPtr<PlaceholderRenderingContextSource> takePlaceholderSource();
private:
RefPtr<PlaceholderRenderingContextSource> m_placeholderSource;
IntSize m_size;
bool m_originClean;
};
class OffscreenCanvas final : public ActiveDOMObject, public CanvasBase, public RefCounted<OffscreenCanvas>, public EventTarget {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_EXPORT(OffscreenCanvas, WEBCORE_EXPORT);
public:
void ref() const final { RefCounted::ref(); }
void deref() const final { RefCounted::deref(); }
struct ImageEncodeOptions {
String type = "image/png"_s;
double quality = 1.0;
};
enum class RenderingContextType {
_2d,
Webgl,
Webgl2,
Bitmaprenderer,
Webgpu
};
static bool enabledForContext(ScriptExecutionContext&);
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, unsigned width, unsigned height);
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, std::unique_ptr<DetachedOffscreenCanvas>&&);
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, PlaceholderRenderingContext&);
WEBCORE_EXPORT virtual ~OffscreenCanvas();
void setWidth(unsigned);
void setHeight(unsigned);
void setImageBufferAndMarkDirty(RefPtr<ImageBuffer>&&) final;
CanvasRenderingContext* renderingContext() const final { return m_context.get(); }
const CSSParserContext& cssParserContext() const final;
ExceptionOr<std::optional<OffscreenRenderingContext>> getContext(JSC::JSGlobalObject&, RenderingContextType, FixedVector<JSC::Strong<JSC::Unknown>>&& arguments);
ExceptionOr<RefPtr<ImageBitmap>> transferToImageBitmap();
void convertToBlob(ImageEncodeOptions&&, Ref<DeferredPromise>&&);
void didDraw(const std::optional<FloatRect>&, ShouldApplyPostProcessingToDirtyRect) final;
Image* copiedImage() const final;
void clearCopiedImage() const final;
SecurityOrigin* securityOrigin() const final;
bool canDetach() const;
std::unique_ptr<DetachedOffscreenCanvas> detach();
void commitToPlaceholderCanvas();
void queueTaskKeepingObjectAlive(TaskSource, Function<void()>&&) final;
void dispatchEvent(Event&) final;
bool isDetached() const { return m_detached; };
private:
OffscreenCanvas(ScriptExecutionContext&, IntSize, RefPtr<PlaceholderRenderingContextSource>&&);
bool isOffscreenCanvas() const final { return true; }
ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
ScriptExecutionContext* canvasBaseScriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
enum EventTargetInterfaceType eventTargetInterface() const final { return EventTargetInterfaceType::OffscreenCanvas; }
void refEventTarget() final { RefCounted::ref(); }
void derefEventTarget() final { RefCounted::deref(); }
void setSize(const IntSize&) final;
void createImageBuffer() const final;
void reset();
void scheduleCommitToPlaceholderCanvas();
std::unique_ptr<CanvasRenderingContext> m_context;
RefPtr<PlaceholderRenderingContextSource> m_placeholderSource;
mutable RefPtr<Image> m_copiedImage;
bool m_detached { false };
bool m_hasScheduledCommit { false };
mutable std::unique_ptr<CSSParserContext> m_cssParserContext;
};
}
SPECIALIZE_TYPE_TRAITS_CANVAS(WebCore::OffscreenCanvas, isOffscreenCanvas())
#endif
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