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/*
* Copyright (C) 2020-2021 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 "DestinationColorSpace.h"
#include "FloatRect.h"
#include "GraphicsTypesGL.h"
#include "ImagePaintingOptions.h"
#include "IntRect.h"
#include "PixelBufferFormat.h"
#include "PlatformLayer.h"
#include "RenderingMode.h"
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class GraphicsContext;
class GraphicsContextGL;
class HostWindow;
class Image;
class NativeImage;
class PixelBuffer;
enum BackingStoreCopy {
CopyBackingStore, // Guarantee subsequent draws don't affect the copy.
DontCopyBackingStore // Subsequent draws may affect the copy.
};
enum class PreserveResolution : uint8_t {
No,
Yes,
};
enum class VolatilityState : uint8_t {
Valid,
Empty
};
class ThreadSafeImageBufferFlusher {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(ThreadSafeImageBufferFlusher);
public:
ThreadSafeImageBufferFlusher() = default;
virtual ~ThreadSafeImageBufferFlusher() = default;
virtual void flush() = 0;
};
class ImageBufferBackendSharing {
public:
virtual ~ImageBufferBackendSharing() = default;
virtual bool isImageBufferBackendHandleSharing() const { return false; }
};
class ImageBufferBackend {
public:
struct Parameters {
FloatSize logicalSize;
float resolutionScale;
DestinationColorSpace colorSpace;
PixelFormat pixelFormat;
};
WEBCORE_EXPORT virtual ~ImageBufferBackend();
WEBCORE_EXPORT static IntSize calculateBackendSize(const Parameters&);
WEBCORE_EXPORT static size_t calculateMemoryCost(const IntSize& backendSize, unsigned bytesPerRow);
static size_t calculateExternalMemoryCost(const Parameters&) { return 0; }
WEBCORE_EXPORT static AffineTransform calculateBaseTransform(const Parameters&, bool originAtBottomLeftCorner);
virtual GraphicsContext& context() const = 0;
virtual void flushContext() { }
virtual IntSize backendSize() const { return { }; }
virtual RefPtr<NativeImage> copyNativeImage(BackingStoreCopy) const = 0;
virtual RefPtr<Image> copyImage(BackingStoreCopy, PreserveResolution) const = 0;
WEBCORE_EXPORT virtual void draw(GraphicsContext&, const FloatRect& destRect, const FloatRect& srcRect, const ImagePaintingOptions&) = 0;
WEBCORE_EXPORT virtual void drawPattern(GraphicsContext&, const FloatRect& destRect, const FloatRect& srcRect, const AffineTransform& patternTransform, const FloatPoint& phase, const FloatSize& spacing, const ImagePaintingOptions&) = 0;
WEBCORE_EXPORT virtual RefPtr<NativeImage> sinkIntoNativeImage();
WEBCORE_EXPORT virtual RefPtr<Image> sinkIntoImage(PreserveResolution);
WEBCORE_EXPORT virtual void drawConsuming(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, const ImagePaintingOptions&);
virtual void clipToMask(GraphicsContext&, const FloatRect&) { }
WEBCORE_EXPORT void convertToLuminanceMask();
virtual void transformToColorSpace(const DestinationColorSpace&) { }
virtual String toDataURL(const String& mimeType, std::optional<double> quality, PreserveResolution) const = 0;
virtual Vector<uint8_t> toData(const String& mimeType, std::optional<double> quality) const = 0;
virtual std::optional<PixelBuffer> getPixelBuffer(const PixelBufferFormat& outputFormat, const IntRect&) const = 0;
virtual void putPixelBuffer(const PixelBuffer&, const IntRect& srcRect, const IntPoint& destPoint, AlphaPremultiplication destFormat) = 0;
virtual PlatformLayer* platformLayer() const { return nullptr; }
virtual bool copyToPlatformTexture(GraphicsContextGL&, GCGLenum, PlatformGLObject, GCGLenum, bool, bool) const { return false; }
virtual bool isInUse() const { return false; }
virtual void releaseGraphicsContext() { ASSERT_NOT_REACHED(); }
virtual void releaseBufferToPool() { }
// Returns true on success.
virtual bool setVolatile() { return true; }
virtual VolatilityState setNonVolatile() { return VolatilityState::Valid; }
virtual std::unique_ptr<ThreadSafeImageBufferFlusher> createFlusher() { return nullptr; }
void applyBaseTransformToContext() const;
static constexpr bool isOriginAtBottomLeftCorner = false;
virtual bool originAtBottomLeftCorner() const { return isOriginAtBottomLeftCorner; }
static constexpr bool canMapBackingStore = true;
static constexpr RenderingMode renderingMode = RenderingMode::Unaccelerated;
virtual void ensureNativeImagesHaveCopiedBackingStore() { }
virtual ImageBufferBackendSharing* toBackendSharing() { return nullptr; }
protected:
WEBCORE_EXPORT ImageBufferBackend(const Parameters&);
virtual unsigned bytesPerRow() const = 0;
template<typename T>
T toBackendCoordinates(T t) const
{
static_assert(std::is_same<T, IntPoint>::value || std::is_same<T, IntSize>::value || std::is_same<T, IntRect>::value);
if (resolutionScale() != 1)
t.scale(resolutionScale());
return t;
}
IntSize logicalSize() const { return IntSize(m_parameters.logicalSize); }
float resolutionScale() const { return m_parameters.resolutionScale; }
const DestinationColorSpace& colorSpace() const { return m_parameters.colorSpace; }
PixelFormat pixelFormat() const { return m_parameters.pixelFormat; }
IntRect logicalRect() const { return IntRect(IntPoint::zero(), logicalSize()); };
IntRect backendRect() const { return IntRect(IntPoint::zero(), backendSize()); };
WEBCORE_EXPORT std::optional<PixelBuffer> getPixelBuffer(const PixelBufferFormat& outputFormat, const IntRect& srcRect, void* data) const;
WEBCORE_EXPORT void putPixelBuffer(const PixelBuffer&, const IntRect& srcRect, const IntPoint& destPoint, AlphaPremultiplication destFormat, void* data);
Parameters m_parameters;
};
} // namespace WebCore
namespace WTF {
template<> struct EnumTraits<WebCore::PreserveResolution> {
using values = EnumValues<
WebCore::PreserveResolution,
WebCore::PreserveResolution::No,
WebCore::PreserveResolution::Yes
>;
};
} // namespace WTF
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