51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
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/*
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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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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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SkDebugf("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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