Source/WebCore/platform/graphics/cg/ImageBufferIOSurfaceBackend.h

/*
 * Copyright (C) 2020-2021 Apple Inc.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#pragma once

#if HAVE(IOSURFACE)

#include "ImageBufferCGBackend.h"
#include "IOSurface.h"
#include <wtf/IsoMalloc.h>

namespace WebCore {

class WEBCORE_EXPORT ImageBufferIOSurfaceBackend : public ImageBufferCGBackend {
    WTF_MAKE_ISO_ALLOCATED(ImageBufferIOSurfaceBackend);
    WTF_MAKE_NONCOPYABLE(ImageBufferIOSurfaceBackend);
public:
    static IntSize calculateSafeBackendSize(const Parameters&);
    static unsigned calculateBytesPerRow(const IntSize& backendSize);
    static size_t calculateMemoryCost(const Parameters&);
    static size_t calculateExternalMemoryCost(const Parameters&);
    
    static std::unique_ptr<ImageBufferIOSurfaceBackend> create(const Parameters&, const HostWindow*);
    // FIXME: Rename to createUsingColorSpaceOfGraphicsContext() (or something like that).
    static std::unique_ptr<ImageBufferIOSurfaceBackend> create(const Parameters&, const GraphicsContext&);

    ImageBufferIOSurfaceBackend(const Parameters&, std::unique_ptr<IOSurface>&&);

    IOSurface* surface();

    GraphicsContext& context() const override;
    void flushContext() override;

    IntSize backendSize() const override;
    
    RefPtr<NativeImage> copyNativeImage(BackingStoreCopy = CopyBackingStore) const override;
    RefPtr<NativeImage> sinkIntoNativeImage() override;

    void draw(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, const ImagePaintingOptions&) override;
    void drawConsuming(GraphicsContext&, const FloatRect& destRect, const FloatRect& srcRect, const ImagePaintingOptions&) override;

    std::optional<PixelBuffer> getPixelBuffer(const PixelBufferFormat& outputFormat, const IntRect&) const override;
    void putPixelBuffer(const PixelBuffer&, const IntRect& srcRect, const IntPoint& destPoint, AlphaPremultiplication destFormat) override;

    bool isInUse() const override;
    void releaseGraphicsContext() override;
    VolatilityState setVolatile(bool) override;
    void releaseBufferToPool() override;

    static constexpr RenderingMode renderingMode = RenderingMode::Accelerated;

protected:
    static RetainPtr<CGColorSpaceRef> contextColorSpace(const GraphicsContext&);
    unsigned bytesPerRow() const override;

    // ImageBufferCGBackend overrides.
    RetainPtr<CGImageRef> copyCGImageForEncoding(CFStringRef destinationUTI, PreserveResolution) const final;

    void prepareToDrawIntoContext(GraphicsContext& destinationContext) override;
    void invalidateCachedNativeImage() const;

    std::unique_ptr<IOSurface> m_surface;
    IOSurfaceSeed m_lastSeedWhenDrawingImage { 0 };
    mutable bool m_requiresDrawAfterPutPixelBuffer { false };

    mutable bool m_needsSetupContext { false };
};

} // namespace WebCore

#endif // HAVE(IOSURFACE)