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/*
* Copyright (C) 2009-2023 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. ``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 "CanvasBase.h"
#include "GraphicsLayerContentsDisplayDelegate.h"
#include "ImageBuffer.h"
#include "ScriptWrappable.h"
#include <wtf/CheckedRef.h>
#include <wtf/Forward.h>
#include <wtf/Lock.h>
#include <wtf/Noncopyable.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/StringHash.h>
namespace WebCore {
class CSSStyleImageValue;
class CachedImage;
class CanvasPattern;
class DestinationColorSpace;
class GraphicsLayer;
class HTMLCanvasElement;
class HTMLImageElement;
class HTMLVideoElement;
class ImageBitmap;
class SVGImageElement;
class WebGLObject;
enum class ImageBufferPixelFormat : uint8_t;
class CanvasRenderingContext : public ScriptWrappable, public CanMakeWeakPtr<CanvasRenderingContext> {
WTF_MAKE_NONCOPYABLE(CanvasRenderingContext);
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(CanvasRenderingContext);
public:
virtual ~CanvasRenderingContext();
static UncheckedKeyHashSet<CanvasRenderingContext*>& instances() WTF_REQUIRES_LOCK(instancesLock());
static Lock& instancesLock() WTF_RETURNS_LOCK(s_instancesLock);
WEBCORE_EXPORT void ref() const;
WEBCORE_EXPORT void deref() const;
CanvasBase& canvasBase() const { return m_canvas; }
bool is2dBase() const { return is2d() || isOffscreen2d() || isPaint(); }
bool is2d() const { return m_type == Type::CanvasElement2D; }
bool isWebGL1() const { return m_type == Type::WebGL1; }
bool isWebGL2() const { return m_type == Type::WebGL2; }
bool isWebGL() const { return isWebGL1() || isWebGL2(); }
bool isWebGPU() const { return m_type == Type::WebGPU; }
bool isGPUBased() const { return isWebGPU() || isWebGL(); }
bool isBitmapRenderer() const { return m_type == Type::BitmapRenderer; }
bool isPlaceholder() const { return m_type == Type::Placeholder; }
bool isOffscreen2d() const { return m_type == Type::Offscreen2D; }
bool isPaint() const { return m_type == Type::Paint; }
virtual void clearAccumulatedDirtyRect() { }
// Canvas 2DContext drawing buffer is the same as display buffer.
// WebGL, WebGPU draws to drawing buffer. The draw buffer is then swapped to
// display buffer during preparation and compositor composites the display buffer.
// toDataURL and similar functions from JS execution reads the drawing buffer.
// Web Inspector and similar reads from the engine reads both.
enum class SurfaceBuffer : uint8_t {
DrawingBuffer,
DisplayBuffer
};
// Draws the source buffer to the canvasBase().buffer().
virtual RefPtr<ImageBuffer> surfaceBufferToImageBuffer(SurfaceBuffer);
virtual bool isSurfaceBufferTransparentBlack(SurfaceBuffer) const;
bool delegatesDisplay() const;
virtual RefPtr<GraphicsLayerContentsDisplayDelegate> layerContentsDisplayDelegate();
virtual void setContentsToLayer(GraphicsLayer&);
// Returns the drawing buffer and runs the compositing steps of transferToImageBitmap.
virtual RefPtr<ImageBuffer> transferToImageBuffer();
bool hasActiveInspectorCanvasCallTracer() const { return m_hasActiveInspectorCanvasCallTracer; }
void setHasActiveInspectorCanvasCallTracer(bool hasActiveInspectorCanvasCallTracer) { m_hasActiveInspectorCanvasCallTracer = hasActiveInspectorCanvasCallTracer; }
// Returns true if there are pending deferred operations that might consume memory.
virtual bool hasDeferredOperations() const { return false; }
// Called periodically if needsFlush() was true when canvas change happened.
virtual void flushDeferredOperations() { }
virtual bool compositingResultsNeedUpdating() const { return false; }
virtual bool needsPreparationForDisplay() const { return false; }
// Swaps the current drawing buffer to display buffer.
virtual void prepareForDisplay() { }
virtual ImageBufferPixelFormat pixelFormat() const;
virtual DestinationColorSpace colorSpace() const;
virtual bool willReadFrequently() const;
virtual std::optional<RenderingMode> renderingModeForTesting() const { return std::nullopt; }
#if ENABLE(PIXEL_FORMAT_RGBA16F)
bool isHDR() const { return pixelFormat() == ImageBufferPixelFormat::RGBA16F; }
#endif
void setIsInPreparationForDisplayOrFlush(bool flag) { m_isInPreparationForDisplayOrFlush = flag; }
bool isInPreparationForDisplayOrFlush() const { return m_isInPreparationForDisplayOrFlush; }
protected:
enum class Type : uint8_t {
CanvasElement2D,
Offscreen2D,
Paint,
BitmapRenderer,
Placeholder,
WebGL1,
WebGL2,
WebGPU,
};
explicit CanvasRenderingContext(CanvasBase&, Type);
bool taintsOrigin(const CanvasPattern*);
bool taintsOrigin(const CanvasBase*);
bool taintsOrigin(const CachedImage*);
bool taintsOrigin(const HTMLImageElement*);
bool taintsOrigin(const SVGImageElement*);
bool taintsOrigin(const HTMLVideoElement*);
bool taintsOrigin(const ImageBitmap*);
bool taintsOrigin(const URL&);
template<class T> void checkOrigin(const T* arg)
{
if (m_canvas->originClean() && taintsOrigin(arg))
m_canvas->setOriginTainted();
}
void checkOrigin(const URL&);
void checkOrigin(const CSSStyleImageValue&);
bool m_isInPreparationForDisplayOrFlush { false };
bool m_hasActiveInspectorCanvasCallTracer { false };
private:
static Lock s_instancesLock;
WeakRef<CanvasBase> m_canvas;
const Type m_type;
};
} // namespace WebCore
#define SPECIALIZE_TYPE_TRAITS_CANVASRENDERINGCONTEXT(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(ToValueTypeName) \
static bool isType(const WebCore::CanvasRenderingContext& context) { return context.predicate; } \
SPECIALIZE_TYPE_TRAITS_END()
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