a5783aeff0
Implements testing in DM for these implementations. nanobench testing will follow after this. TBR=scroggo BUG=skia: Committed: https://skia.googlesource.com/skia/+/76f755e6d54a32f9887ad254ce59a3a62f28bde4 Review URL: https://codereview.chromium.org/1288963002
78 lines
2.7 KiB
C++
78 lines
2.7 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkBitmapRegionDecoder_DEFINED
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#define SkBitmapRegionDecoder_DEFINED
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#include "SkBitmap.h"
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#include "SkStream.h"
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/*
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* This class aims to provide an interface to test multiple implementations of
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* SkBitmapRegionDecoder.
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*/
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class SkBitmapRegionDecoderInterface {
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public:
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enum Strategy {
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kCanvas_Strategy, // Draw to the canvas, uses SkCodec
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kOriginal_Strategy, // Sampling, uses SkImageDecoder
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// TODO (msarett): Add strategy for SkScaledCodec
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};
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/*
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* @param stream Encoded image stream, takes ownership
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* @param strategy Strategy used for scaling and subsetting
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* @return Tries to create an SkBitmapRegionDecoder, returns NULL
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* on failure
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*/
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static SkBitmapRegionDecoderInterface* CreateBitmapRegionDecoder(
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SkStreamRewindable* stream, Strategy strategy);
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/*
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* Decode a scaled region of the encoded image stream
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*
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* @param start_x X-coordinate of upper-left corner of region.
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* This coordinate is unscaled, relative to the original dimensions.
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* @param start_y Y-coordinate of upper-left corner of region.
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* This coordinate is unscaled, relative to the original dimensions.
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* @param width Width of the region to decode.
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* This distance is unscaled, relative to the original dimensions.
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* @param height Height of the region to decode.
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* This distance is unscaled, relative to the original dimensions.
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* @param sampleSize An integer downscaling factor for the decode.
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* @param colorType Preferred output colorType.
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* New implementations should return NULL if they do not support
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* decoding to this color type.
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* The old kOriginal_Strategy will decode to a default color type
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* if this color type is unsupported.
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* @return Pointer to a bitmap of the decoded region on success, NULL on
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* failure.
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*/
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virtual SkBitmap* decodeRegion(int start_x, int start_y, int width,
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int height, int sampleSize,
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SkColorType colorType) = 0;
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int width() const { return fWidth; }
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int height() const { return fHeight; }
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virtual ~SkBitmapRegionDecoderInterface() {}
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protected:
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SkBitmapRegionDecoderInterface(int width, int height)
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: fWidth(width)
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, fHeight(height)
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{}
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private:
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const int fWidth;
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const int fHeight;
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};
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#endif
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