#pragma once
#if ENABLE(OFFSCREEN_CANVAS)
#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/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/WeakPtr.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CanvasRenderingContext;
class CSSValuePool;
class DeferredPromise;
class HTMLCanvasElement;
class ImageBitmap;
class ImageData;
class OffscreenCanvasRenderingContext2D;
class WebGLRenderingContext;
#if ENABLE(WEBGL)
using OffscreenRenderingContext = Variant<RefPtr<OffscreenCanvasRenderingContext2D>, RefPtr<WebGLRenderingContext>>;
#else
using OffscreenRenderingContext = Variant<RefPtr<OffscreenCanvasRenderingContext2D>>;
#endif
class DetachedOffscreenCanvas {
WTF_MAKE_NONCOPYABLE(DetachedOffscreenCanvas);
WTF_MAKE_FAST_ALLOCATED;
friend class OffscreenCanvas;
public:
DetachedOffscreenCanvas(std::unique_ptr<ImageBuffer>&&, const IntSize&, bool originClean);
std::unique_ptr<ImageBuffer> takeImageBuffer();
const IntSize& size() const { return m_size; }
bool originClean() const { return m_originClean; }
size_t memoryCost() const
{
auto* buffer = m_buffer.get();
if (buffer)
return buffer->memoryCost();
return 0;
}
WeakPtr<HTMLCanvasElement> takePlaceholderCanvas();
private:
std::unique_ptr<ImageBuffer> m_buffer;
IntSize m_size;
bool m_originClean;
WeakPtr<HTMLCanvasElement> m_placeholderCanvas;
};
class OffscreenCanvas final : public RefCounted<OffscreenCanvas>, public CanvasBase, public EventTargetWithInlineData, private ContextDestructionObserver {
WTF_MAKE_ISO_ALLOCATED(OffscreenCanvas);
public:
struct ImageEncodeOptions {
String type = "image/png";
double quality = 1.0;
};
enum class RenderingContextType {
_2d,
Webgl
};
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, unsigned width, unsigned height);
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, std::unique_ptr<DetachedOffscreenCanvas>&&);
static Ref<OffscreenCanvas> create(ScriptExecutionContext&, HTMLCanvasElement&);
virtual ~OffscreenCanvas();
unsigned width() const final;
unsigned height() const final;
void setWidth(unsigned);
void setHeight(unsigned);
CanvasRenderingContext* renderingContext() const final { return m_context.get(); }
ExceptionOr<Optional<OffscreenRenderingContext>> getContext(JSC::JSGlobalObject&, RenderingContextType, Vector<JSC::Strong<JSC::Unknown>>&& arguments);
ExceptionOr<RefPtr<ImageBitmap>> transferToImageBitmap();
void convertToBlob(ImageEncodeOptions&&, Ref<DeferredPromise>&&);
void didDraw(const FloatRect&) final;
Image* copiedImage() const final;
bool hasCreatedImageBuffer() const final { return m_hasCreatedImageBuffer; }
SecurityOrigin* securityOrigin() const final;
bool canDetach() const;
std::unique_ptr<DetachedOffscreenCanvas> detach();
void commitToPlaceholderCanvas();
CSSValuePool& cssValuePool();
using RefCounted::ref;
using RefCounted::deref;
private:
OffscreenCanvas(ScriptExecutionContext&, unsigned width, unsigned height);
bool isOffscreenCanvas() const final { return true; }
ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
ScriptExecutionContext* canvasBaseScriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
EventTargetInterface eventTargetInterface() const final { return OffscreenCanvasEventTargetInterfaceType; }
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
void refCanvasBase() final { ref(); }
void derefCanvasBase() final { deref(); }
void setSize(const IntSize&) final;
void createImageBuffer() const final;
std::unique_ptr<ImageBuffer> takeImageBuffer() const;
void reset();
void clearCopiedImage() const;
void setPlaceholderCanvas(HTMLCanvasElement&);
void pushBufferToPlaceholder();
void scheduleCommitToPlaceholderCanvas();
std::unique_ptr<CanvasRenderingContext> m_context;
mutable bool m_hasCreatedImageBuffer { false };
bool m_detached { false };
mutable RefPtr<Image> m_copiedImage;
bool m_hasScheduledCommit { false };
WeakPtr<HTMLCanvasElement> m_placeholderCanvas;
mutable Lock m_commitLock;
bool m_hasPendingCommitData { false };
RefPtr<ImageData> m_pendingCommitData;
};
}
SPECIALIZE_TYPE_TRAITS_CANVAS(WebCore::OffscreenCanvas, isOffscreenCanvas())
#endif