0459c9425f
This approach to subset decoding is no longer supported. We have replaced it with an implementation that does not depend on forked libraries. https://codereview.chromium.org/1406153015/ BUG=skia: Review URL: https://codereview.chromium.org/1430493005
102 lines
3.5 KiB
C++
102 lines
3.5 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 "CodecBenchPriv.h"
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#include "SubsetZoomBench.h"
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#include "SubsetBenchPriv.h"
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#include "SkData.h"
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#include "SkCodec.h"
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#include "SkImageDecoder.h"
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#include "SkOSFile.h"
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#include "SkStream.h"
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/*
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*
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* This benchmark is designed to test the performance of subset decoding.
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* Choose subsets to mimic a user zooming in or out on a photo.
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*
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*/
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SubsetZoomBench::SubsetZoomBench(const SkString& path,
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SkColorType colorType,
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uint32_t subsetWidth,
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uint32_t subsetHeight)
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: fColorType(colorType)
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, fSubsetWidth(subsetWidth)
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, fSubsetHeight(subsetHeight)
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{
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// Parse the filename
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SkString baseName = SkOSPath::Basename(path.c_str());
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// Choose an informative color name
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const char* colorName = color_type_to_str(fColorType);
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fName.printf("CodecSubsetZoom_%dx%d_%s_%s", fSubsetWidth,
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fSubsetHeight, baseName.c_str(), colorName);
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// Perform the decode setup
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SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(path.c_str()));
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fStream.reset(new SkMemoryStream(encoded));
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}
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const char* SubsetZoomBench::onGetName() {
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return fName.c_str();
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}
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bool SubsetZoomBench::isSuitableFor(Backend backend) {
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return kNonRendering_Backend == backend;
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}
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void SubsetZoomBench::onDraw(int n, SkCanvas* canvas) {
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// When the color type is kIndex8, we will need to store the color table. If it is
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// used, it will be initialized by the codec.
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int colorCount;
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SkPMColor colors[256];
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for (int count = 0; count < n; count++) {
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SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(fStream->duplicate()));
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SkASSERT(SkCodec::kOutOfOrder_SkScanlineOrder != codec->getScanlineOrder());
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const SkImageInfo info = codec->getInfo().makeColorType(fColorType);
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const int centerX = info.width() / 2;
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const int centerY = info.height() / 2;
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int w = fSubsetWidth;
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int h = fSubsetHeight;
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do {
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const int subsetStartX = SkTMax(0, centerX - w / 2);
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const int subsetStartY = SkTMax(0, centerY - h / 2);
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const int subsetWidth = SkTMin(w, info.width() - subsetStartX);
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const int subsetHeight = SkTMin(h, info.height() - subsetStartY);
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// The scanline decoder will handle subsetting in the x-dimension.
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SkIRect subset = SkIRect::MakeXYWH(subsetStartX, 0, subsetWidth,
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codec->getInfo().height());
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SkCodec::Options options;
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options.fSubset = ⊂
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SkDEBUGCODE(SkCodec::Result result = )
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codec->startScanlineDecode(info, &options, colors, &colorCount);
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SkASSERT(SkCodec::kSuccess == result);
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// Note that if we subsetted and scaled in a single step, we could use the
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// same bitmap - as is often done in actual use cases.
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SkBitmap bitmap;
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SkImageInfo subsetInfo = info.makeWH(subsetWidth, subsetHeight);
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alloc_pixels(&bitmap, subsetInfo, colors, colorCount);
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SkDEBUGCODE(bool success = ) codec->skipScanlines(subsetStartY);
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SkASSERT(success);
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SkDEBUGCODE(int lines = ) codec->getScanlines(bitmap.getPixels(),
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subsetHeight, bitmap.rowBytes());
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SkASSERT(subsetHeight == lines);
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w <<= 1;
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h <<= 1;
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} while (w < 2 * info.width() || h < 2 * info.height());
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}
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}
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