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Unified Diff: bench/subset/SubsetZoomBench.cpp

Issue 1160953002: Subset decoding benchmarks (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Added FIXME Created 5 years, 6 months ago
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Index: bench/subset/SubsetZoomBench.cpp
diff --git a/bench/subset/SubsetZoomBench.cpp b/bench/subset/SubsetZoomBench.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3ce193b6ea8da33e7083da2c1e3386ea58ac2114
--- /dev/null
+++ b/bench/subset/SubsetZoomBench.cpp
@@ -0,0 +1,117 @@
+/*
+ * 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 "SubsetZoomBench.h"
+#include "SubsetBenchPriv.h"
+#include "SkData.h"
+#include "SkCodec.h"
+#include "SkImageDecoder.h"
+#include "SkOSFile.h"
+#include "SkStream.h"
+
+/*
+ *
+ * This benchmark is designed to test the performance of subset decoding.
+ * Choose subsets to mimic a user zooming in or out on a photo.
+ *
+ */
+
+SubsetZoomBench::SubsetZoomBench(const SkString& path,
+ SkColorType colorType,
+ uint32_t subsetWidth,
+ uint32_t subsetHeight,
+ bool useCodec)
+ : fColorType(colorType)
+ , fSubsetWidth(subsetWidth)
+ , fSubsetHeight(subsetHeight)
+ , fUseCodec(useCodec)
+{
+ // Parse the filename
+ SkString baseName = SkOSPath::Basename(path.c_str());
+
+ // Choose an informative color name
+ const char* colorName = get_color_name(fColorType);
+
+ fName.printf("%sSubsetZoom_%dx%d_%s_%s", fUseCodec ? "Codec" : "Image", fSubsetWidth,
+ fSubsetHeight, baseName.c_str(), colorName);
+
+ // Perform the decode setup
+ SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(path.c_str()));
+ fStream.reset(new SkMemoryStream(encoded));
+}
+
+const char* SubsetZoomBench::onGetName() {
+ return fName.c_str();
+}
+
+bool SubsetZoomBench::isSuitableFor(Backend backend) {
+ return kNonRendering_Backend == backend;
+}
+
+void SubsetZoomBench::onDraw(const int n, SkCanvas* canvas) {
+ // When the color type is kIndex8, we will need to store the color table. If it is
+ // used, it will be initialized by the codec.
+ int colorCount;
+ SkPMColor colors[256];
+ if (fUseCodec) {
+ for (int count = 0; count < n; count++) {
+ SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(fStream->duplicate()));
+ const SkImageInfo info = codec->getInfo().makeColorType(fColorType);
+ SkAutoTDeleteArray<uint8_t> row(SkNEW_ARRAY(uint8_t, info.minRowBytes()));
+ SkScanlineDecoder* scanlineDecoder = codec->getScanlineDecoder(
+ info, NULL, colors, &colorCount);
+
+ const int centerX = info.width() / 2;
+ const int centerY = info.height() / 2;
+ int w = fSubsetWidth;
+ int h = fSubsetHeight;
+ do {
+ const int subsetStartX = SkTMax(0, centerX - w / 2);
+ const int subsetStartY = SkTMax(0, centerY - h / 2);
+ const int subsetWidth = SkTMin(w, info.width() - subsetStartX);
+ const int subsetHeight = SkTMin(h, info.height() - subsetStartY);
+ // Note that if we subsetted and scaled in a single step, we could use the
+ // same bitmap - as is often done in actual use cases.
+ SkBitmap bitmap;
+ bitmap.allocPixels(info.makeWH(subsetWidth, subsetHeight));
+
+ uint32_t bpp = info.bytesPerPixel();
+ scanlineDecoder->skipScanlines(subsetStartY);
+ for (int y = 0; y < subsetHeight; y++) {
+ scanlineDecoder->getScanlines(row.get(), 1, 0);
+ memcpy(bitmap.getAddr(0, y), row.get() + subsetStartX * bpp,
+ subsetWidth * bpp);
+ }
+ w <<= 1;
+ h <<= 1;
+ } while (w < 2 * info.width() || h < 2 * info.height());
+ }
+ } else {
+ for (int count = 0; count < n; count++) {
+ int width, height;
+ SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream));
+ decoder->buildTileIndex(fStream->duplicate(), &width, &height);
+
+ const int centerX = width / 2;
+ const int centerY = height / 2;
+ int w = fSubsetWidth;
+ int h = fSubsetHeight;
+ do {
+ const int subsetStartX = SkTMax(0, centerX - w / 2);
+ const int subsetStartY = SkTMax(0, centerY - h / 2);
+ const int subsetWidth = SkTMin(w, width - subsetStartX);
+ const int subsetHeight = SkTMin(h, height - subsetStartY);
+ SkBitmap bitmap;
+ SkIRect rect = SkIRect::MakeXYWH(subsetStartX, subsetStartY, subsetWidth,
+ subsetHeight);
+ decoder->decodeSubset(&bitmap, rect, fColorType);
+ w <<= 1;
+ h <<= 1;
+ } while (w < 2 * width || h < 2 * height);
+ }
+ }
+}
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