| /* |
| * Copyright (c) 2008, Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "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 THE COPYRIGHT |
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| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #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_ |