04965c6f11
Use SkCodecPrintf instead of SkDebugf. Check if the conversion is possible rather than starting many decodes that will certainly fail. Small refactor to code that deals with subsets that fall outside of the image. BUG=skia: Review URL: https://codereview.chromium.org/1395383002
50 lines
1.5 KiB
C++
50 lines
1.5 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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#include "SkBitmap.h"
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#include "SkBitmapRegionDecoderInterface.h"
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#include "SkImageDecoder.h"
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#include "SkTemplates.h"
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/*
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* This class aims to duplicate the current implementation of
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* SkBitmapRegionDecoder in Android.
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*/
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class SkBitmapRegionSampler : public SkBitmapRegionDecoderInterface {
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public:
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/*
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* Takes ownership of pointer to decoder
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*/
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SkBitmapRegionSampler(SkImageDecoder* decoder, int width, int height);
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/*
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* Three differences from the Android version:
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* Returns a Skia bitmap instead of an Android bitmap.
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* Android version attempts to reuse a recycled bitmap.
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* Removed the options object and used parameters for color type and
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* sample size.
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*/
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SkBitmap* decodeRegion(int start_x, int start_y, int width, int height,
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int sampleSize, SkColorType prefColorType) override;
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bool conversionSupported(SkColorType colorType) override {
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// SkBitmapRegionSampler does not allow the client to check if the conversion
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// is supported. We will return true as a default. If the conversion is in
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// fact not supported, decodeRegion() will ignore the prefColorType and choose
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// its own color type. We catch this and fail non-fatally in our test code.
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return true;
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}
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private:
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SkAutoTDelete<SkImageDecoder> fDecoder;
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typedef SkBitmapRegionDecoderInterface INHERITED;
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};
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