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Side by Side Diff: bench/subset/SubsetZoomBench.cpp

Issue 1531833002: Remove Subset*Benches (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years ago
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1 /*
2 * Copyright 2015 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "CodecBenchPriv.h"
9 #include "SubsetZoomBench.h"
10 #include "SubsetBenchPriv.h"
11 #include "SkData.h"
12 #include "SkCodec.h"
13 #include "SkImageDecoder.h"
14 #include "SkOSFile.h"
15 #include "SkStream.h"
16
17 /*
18 *
19 * This benchmark is designed to test the performance of subset decoding.
20 * Choose subsets to mimic a user zooming in or out on a photo.
21 *
22 */
23
24 SubsetZoomBench::SubsetZoomBench(const SkString& path,
25 SkColorType colorType,
26 uint32_t subsetWidth,
27 uint32_t subsetHeight)
28 : fColorType(colorType)
29 , fSubsetWidth(subsetWidth)
30 , fSubsetHeight(subsetHeight)
31 {
32 // Parse the filename
33 SkString baseName = SkOSPath::Basename(path.c_str());
34
35 // Choose an informative color name
36 const char* colorName = color_type_to_str(fColorType);
37
38 fName.printf("CodecSubsetZoom_%dx%d_%s_%s", fSubsetWidth,
39 fSubsetHeight, baseName.c_str(), colorName);
40
41 // Perform the decode setup
42 SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(path.c_str()));
43 fStream.reset(new SkMemoryStream(encoded));
44 }
45
46 const char* SubsetZoomBench::onGetName() {
47 return fName.c_str();
48 }
49
50 bool SubsetZoomBench::isSuitableFor(Backend backend) {
51 return kNonRendering_Backend == backend;
52 }
53
54 void SubsetZoomBench::onDraw(int n, SkCanvas* canvas) {
55 // When the color type is kIndex8, we will need to store the color table. I f it is
56 // used, it will be initialized by the codec.
57 int colorCount;
58 SkPMColor colors[256];
59 for (int count = 0; count < n; count++) {
60 SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(fStream->duplicate() ));
61 SkASSERT(SkCodec::kOutOfOrder_SkScanlineOrder != codec->getScanlineOrder ());
62 const SkImageInfo info = codec->getInfo().makeColorType(fColorType);
63
64 const int centerX = info.width() / 2;
65 const int centerY = info.height() / 2;
66 int w = fSubsetWidth;
67 int h = fSubsetHeight;
68 do {
69 const int subsetStartX = SkTMax(0, centerX - w / 2);
70 const int subsetStartY = SkTMax(0, centerY - h / 2);
71 const int subsetWidth = SkTMin(w, info.width() - subsetStartX);
72 const int subsetHeight = SkTMin(h, info.height() - subsetStartY);
73
74 // The scanline decoder will handle subsetting in the x-dimension.
75 SkIRect subset = SkIRect::MakeXYWH(subsetStartX, 0, subsetWidth,
76 codec->getInfo().height());
77 SkCodec::Options options;
78 options.fSubset = &subset;
79
80 SkDEBUGCODE(SkCodec::Result result = )
81 codec->startScanlineDecode(info, &options, colors, &colorCount);
82 SkASSERT(SkCodec::kSuccess == result);
83
84 // Note that if we subsetted and scaled in a single step, we could u se the
85 // same bitmap - as is often done in actual use cases.
86 SkBitmap bitmap;
87 SkImageInfo subsetInfo = info.makeWH(subsetWidth, subsetHeight);
88 alloc_pixels(&bitmap, subsetInfo, colors, colorCount);
89
90 SkDEBUGCODE(bool success = ) codec->skipScanlines(subsetStartY);
91 SkASSERT(success);
92
93 SkDEBUGCODE(int lines = ) codec->getScanlines(bitmap.getPixels(),
94 subsetHeight, bitmap.rowBytes());
95 SkASSERT(subsetHeight == lines);
96
97 w <<= 1;
98 h <<= 1;
99 } while (w < 2 * info.width() || h < 2 * info.height());
100 }
101 }
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