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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmap.h"
#include "SkBitmapRegionDecoderInterface.h"
#include "SkImageDecoder.h"
#include "SkTemplates.h"
/*
* This class aims to duplicate the current implementation of
* SkBitmapRegionDecoder in Android.
*/
class SkBitmapRegionSampler : public SkBitmapRegionDecoderInterface {
public:
/*
* Takes ownership of pointer to decoder
*/
SkBitmapRegionSampler(SkImageDecoder* decoder, int width, int height);
/*
* Three differences from the Android version:
* Returns a Skia bitmap instead of an Android bitmap.
* Android version attempts to reuse a recycled bitmap.
* Removed the options object and used parameters for color type and
* sample size.
*/
SkBitmap* decodeRegion(int start_x, int start_y, int width, int height,
int sampleSize, SkColorType prefColorType) override;
bool conversionSupported(SkColorType colorType) override {
// SkBitmapRegionSampler does not allow the client to check if the conversion
// is supported. We will return true as a default. If the conversion is in
// fact not supported, decodeRegion() will ignore the prefColorType and choose
// its own color type. We catch this and fail non-fatally in our test code.
return true;
}
private:
SkAutoTDelete<SkImageDecoder> fDecoder;
typedef SkBitmapRegionDecoderInterface INHERITED;
};
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