| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkBitmapRegionDecoder_DEFINED |
| #define SkBitmapRegionDecoder_DEFINED |
| |
| #include "SkBitmap.h" |
| #include "SkStream.h" |
| |
| /* |
| * This class aims to provide an interface to test multiple implementations of |
| * SkBitmapRegionDecoder. |
| */ |
| class SkBitmapRegionDecoderInterface { |
| public: |
| |
| enum Strategy { |
| kCanvas_Strategy, // Draw to the canvas, uses SkCodec |
| kOriginal_Strategy, // Sampling, uses SkImageDecoder |
| kAndroidCodec_Strategy, // Uses SkAndroidCodec for scaling and subsetting |
| }; |
| |
| /* |
| * @param data Refs the data while this object exists, unrefs on destruction |
| * @param strategy Strategy used for scaling and subsetting |
| * @return Tries to create an SkBitmapRegionDecoder, returns NULL on failure |
| */ |
| static SkBitmapRegionDecoderInterface* CreateBitmapRegionDecoder( |
| SkData* data, Strategy strategy); |
| |
| /* |
| * Decode a scaled region of the encoded image stream |
| * |
| * @param bitmap Container for decoded pixels. It is assumed that the pixels |
| * are initially unallocated and will be allocated by this function. |
| * @param allocator Allocator for the pixels. If this is NULL, the default |
| * allocator (HeapAllocator) will be used. |
| * @param desiredSubset Subset of the original image to decode. |
| * @param sampleSize An integer downscaling factor for the decode. |
| * @param colorType Preferred output colorType. |
| * New implementations should return NULL if they do not support |
| * decoding to this color type. |
| * The old kOriginal_Strategy will decode to a default color type |
| * if this color type is unsupported. |
| * @param requireUnpremul If the image is not opaque, we will use this to determine the |
| * alpha type to use. |
| * |
| */ |
| virtual bool decodeRegion(SkBitmap* bitmap, SkBitmap::Allocator* allocator, |
| const SkIRect& desiredSubset, int sampleSize, |
| SkColorType colorType, bool requireUnpremul) = 0; |
| /* |
| * @param Requested destination color type |
| * @return true if we support the requested color type and false otherwise |
| */ |
| virtual bool conversionSupported(SkColorType colorType) = 0; |
| |
| int width() const { return fWidth; } |
| int height() const { return fHeight; } |
| |
| virtual ~SkBitmapRegionDecoderInterface() {} |
| |
| protected: |
| |
| SkBitmapRegionDecoderInterface(int width, int height) |
| : fWidth(width) |
| , fHeight(height) |
| {} |
| |
| private: |
| const int fWidth; |
| const int fHeight; |
| }; |
| |
| #endif |