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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_
#define SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_

#include "sky/engine/platform/PlatformExport.h"
#include "sky/engine/platform/geometry/IntSize.h"
#include "sky/engine/platform/graphics/GraphicsTypes.h"
#include "sky/engine/wtf/Forward.h"
#include "sky/engine/wtf/PassRefPtr.h"
#include "sky/engine/wtf/RefCounted.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkSize.h"
#include "third_party/skia/include/core/SkXfermode.h"

namespace blink {

class FloatPoint;
class FloatRect;
class FloatSize;
class GraphicsContext;

// This object is used as the "native image" in our port. When WebKit uses
// PassNativeImagePtr / NativeImagePtr, it is a smart pointer to this type.
// It has an SkBitmap, and also stores a cached resized image.
class PLATFORM_EXPORT NativeImageSkia : public RefCounted<NativeImageSkia> {
public:
    static PassRefPtr<NativeImageSkia> create()
    {
        return adoptRef(new NativeImageSkia());
    }

    // This factory method does a shallow copy of the passed-in SkBitmap
    // (ie., it references the same pixel data and bumps the refcount). Use
    // only when you want sharing semantics.
    static PassRefPtr<NativeImageSkia> create(const SkBitmap& bitmap)
    {
        return adoptRef(new NativeImageSkia(bitmap));
    }

    ~NativeImageSkia();

    // Returns true if the entire image has been decoded.
    bool isDataComplete() const { return bitmap().isImmutable(); }

    // Get reference to the internal SkBitmap representing this image.
    const SkBitmap& bitmap() const { return m_bitmap; }

    // We can keep a resized version of the bitmap cached on this object.
    // This function will return true if there is a cached version of the given
    // scale and subset.
    bool hasResizedBitmap(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const;

    // This will return an existing resized image subset, or generate a new one
    // of the specified size and subset and possibly cache it.
    //
    // scaledImageSize
    // Dimensions of the scaled full image.
    //
    // scaledImageSubset
    // Rectangle of the subset in the scaled image.
    SkBitmap resizedBitmap(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const;

    void draw(
        GraphicsContext*,
        const SkRect& srcRect,
        const SkRect& destRect,
        CompositeOperator,
        WebBlendMode) const;

    void drawPattern(
        GraphicsContext*,
        const FloatRect& srcRect,
        const FloatSize& scale,
        const FloatPoint& phase,
        CompositeOperator,
        const FloatRect& destRect,
        WebBlendMode,
        const IntSize& repeatSpacing) const;

private:
    NativeImageSkia();

    NativeImageSkia(const SkBitmap&);

    // ImageResourceInfo is used to uniquely identify cached or requested image
    // resizes.
    // Image resize is identified by the scaled image size and scaled image subset.
    struct ImageResourceInfo {
        SkISize scaledImageSize;
        SkIRect scaledImageSubset;

        ImageResourceInfo();

        bool isEqual(const SkISize& otherScaledImageSize, const SkIRect& otherScaledImageSubset) const;
        void set(const SkISize& otherScaledImageSize, const SkIRect& otherScaledImageSubset);
        SkIRect rectInSubset(const SkIRect& otherScaledImageRect);
    };

    // Returns true if the given resize operation should either resize the whole
    // image and cache it, or resize just the part it needs and throw the result
    // away.
    //
    // Calling this function may increment a request count that can change the
    // result of subsequent calls.
    //
    // On the one hand, if only a small subset is desired, then we will waste a
    // lot of time resampling the entire thing, so we only want to do exactly
    // what's required. On the other hand, resampling the entire bitmap is
    // better if we're going to be using it more than once (like a bitmap
    // scrolling on and off the screen. Since we only cache when doing the
    // entire thing, it's best to just do it up front.
    bool shouldCacheResampling(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const;

    SkBitmap extractScaledImageFragment(const SkRect& srcRect, float scaleX, float scaleY, SkRect* scaledSrcRect) const;

    // The original image.
    SkBitmap m_bitmap;

    // The cached bitmap fragment. This is a subset of the scaled version of
    // |m_bitmap|. empty() returns true if there is no cached image.
    mutable SkBitmap m_resizedImage;

    // References how many times that the image size has been requested for
    // the last size.
    //
    // Every time we get a call to shouldCacheResampling, if it matches the
    // m_cachedImageInfo, we'll increment the counter, and if not, we'll reset
    // the counter and save the dimensions.
    //
    // This allows us to see if many requests have been made for the same
    // resized image, we know that we should probably cache it, even if all of
    // those requests individually are small and would not otherwise be cached.
    //
    // We also track scaling information and destination subset for the scaled
    // image. See comments for ImageResourceInfo.
    mutable ImageResourceInfo m_cachedImageInfo;
    mutable int m_resizeRequests;
};

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_
