Rename SkBitmapRegionDecoder and Create function

tools/SkBitmapRegionDecoderInterface.h

-/*
- * 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 "SkEncodedFormat.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);
-
-    /*
-     * @param stream   Takes ownership of the stream
-     * @param strategy Strategy used for scaling and subsetting
-     * @return         Tries to create an SkBitmapRegionDecoder, returns NULL on failure
-     */
-    static SkBitmapRegionDecoderInterface* CreateBitmapRegionDecoder(
-            SkStreamRewindable* stream, 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;
-
-    virtual SkEncodedFormat getEncodedFormat() = 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