74 lines
2.1 KiB
C++
74 lines
2.1 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 "DecodingSubsetBench.h"
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#include "SkData.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 image subset decoding.
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* It is invoked from the nanobench.cpp file.
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*
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*/
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DecodingSubsetBench::DecodingSubsetBench(SkString path, SkColorType colorType,
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const int divisor)
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: fColorType(colorType)
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, fDivisor(divisor)
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{
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// Parse filename and the color type to give the benchmark a useful name
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SkString baseName = SkOSPath::Basename(path.c_str());
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const char* colorName;
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switch(colorType) {
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case kN32_SkColorType:
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colorName = "N32";
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break;
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case kRGB_565_SkColorType:
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colorName = "565";
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break;
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case kAlpha_8_SkColorType:
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colorName = "Alpha8";
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break;
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default:
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colorName = "Unknown";
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}
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fName.printf("DecodeSubset_%dx%d_%s_%s", fDivisor, fDivisor,
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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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fDecoder.reset(SkImageDecoder::Factory(fStream));
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}
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const char* DecodingSubsetBench::onGetName() {
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return fName.c_str();
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}
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bool DecodingSubsetBench::isSuitableFor(Backend backend) {
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return kNonRendering_Backend == backend;
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}
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void DecodingSubsetBench::onDraw(const int n, SkCanvas* canvas) {
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for (int i = 0; i < n; i++) {
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int w, h;
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fDecoder->buildTileIndex(fStream->duplicate(), &w, &h);
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// Divide the image into subsets and decode each subset
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const int sW = w / fDivisor;
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const int sH = h / fDivisor;
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for (int y = 0; y < h; y += sH) {
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for (int x = 0; x < w; x += sW) {
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SkBitmap bitmap;
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SkIRect rect = SkIRect::MakeXYWH(x, y, sW, sH);
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fDecoder->decodeSubset(&bitmap, rect, fColorType);
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}
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}
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}
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}
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