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
52 lines
1.7 KiB
C++
52 lines
1.7 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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#include "SkBitmapRegionSampler.h"
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#include "SkCodecPriv.h"
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SkBitmapRegionSampler::SkBitmapRegionSampler(SkImageDecoder* decoder, int width,
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int height)
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: INHERITED(width, height)
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, fDecoder(decoder)
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{}
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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* SkBitmapRegionSampler::decodeRegion(int start_x, int start_y,
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int width, int height,
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int sampleSize,
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SkColorType prefColorType) {
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// Match Android's default settings
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fDecoder->setDitherImage(true);
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fDecoder->setPreferQualityOverSpeed(false);
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fDecoder->setRequireUnpremultipliedColors(false);
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fDecoder->setSampleSize(sampleSize);
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// kAlpha8 is the legacy representation of kGray8 used by SkImageDecoder
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if (kGray_8_SkColorType == prefColorType) {
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prefColorType = kAlpha_8_SkColorType;
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}
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SkIRect region;
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region.fLeft = start_x;
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region.fTop = start_y;
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region.fRight = start_x + width;
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region.fBottom = start_y + height;
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SkAutoTDelete<SkBitmap> bitmap(new SkBitmap());
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if (!fDecoder->decodeSubset(bitmap.get(), region, prefColorType)) {
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SkCodecPrintf("Error: decodeRegion failed.\n");
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return nullptr;
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}
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return bitmap.detach();
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}
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