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