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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 "SkBitmapRegionDecoder.h"
#include "SkCodec.h"
/*
* This class implements SkBitmapRegionDecoder using an SkCodec and
* an SkCanvas. It uses the scanline decoder to subset the height. It then
* will subset the width and scale by drawing to an SkCanvas.
*/
// FIXME: This class works well as a performance/quality comparison for
// SkBitmapRegionCodec, but it lacks several capabilities that are
// required by BitmapRegionDecoder in Android.
// (1) WEBP decodes - because SkWebpCodec does not have a scanline
// decoder.
// (2) Decodes to kGray8 and kIndex8.
// (3) Decodes to kUnpremul.
// (4) Correcting an invalid dstColorType. For example, if the
// client requests kRGB_565 for a non-opaque image, rather than
// fail, we need to go ahead and decode to kN32.
class SkBitmapRegionCanvas : public SkBitmapRegionDecoder {
public:
/*
* Takes ownership of pointer to decoder
*/
SkBitmapRegionCanvas(SkCodec* decoder);
bool decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator,
const SkIRect& desiredSubset, int sampleSize,
SkColorType colorType, bool requireUnpremul) override;
bool conversionSupported(SkColorType colorType) override;
SkEncodedFormat getEncodedFormat() override { return fDecoder->getEncodedFormat(); }
private:
SkAutoTDelete<SkCodec> fDecoder;
typedef SkBitmapRegionDecoder INHERITED;
};
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