skia2/tools/SkBitmapRegionCanvas.h
msarett a5783aeff0 Provides various implementations of Android's SkBitmapRegionDecoder.
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
2015-09-08 15:35:32 -07:00

44 lines
1.3 KiB
C++

/*
* 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 "SkScanlineDecoder.h"
/*
* This class implements SkBitmapRegionDecoder using an SkScanlineDecoder 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 (msarett): This implementation does not support WEBP, because WEBP
// does not have a scanline decoder.
class SkBitmapRegionCanvas : public SkBitmapRegionDecoderInterface {
public:
/*
* Takes ownership of pointer to decoder
*/
SkBitmapRegionCanvas(SkScanlineDecoder* decoder);
/*
* 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;
private:
SkAutoTDelete<SkScanlineDecoder> fDecoder;
typedef SkBitmapRegionDecoderInterface INHERITED;
};