Benchmark designed to exercise fractional image scale/translation
BUG=skia:
R=reed@google.com
Author: humper@google.com
Review URL: https://codereview.chromium.org/491793003
diff --git a/bench/BitmapFractionalBench.cpp b/bench/BitmapFractionalBench.cpp
new file mode 100644
index 0000000..601e830
--- /dev/null
+++ b/bench/BitmapFractionalBench.cpp
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Benchmark.h"
+#include "SkBlurMask.h"
+#include "SkCanvas.h"
+#include "SkPaint.h"
+#include "SkRandom.h"
+#include "SkShader.h"
+#include "SkString.h"
+
+class BitmapFractionalBench: public Benchmark {
+ int fInputSize;
+ int fOutputSize;
+ SkPaint::FilterLevel fFilterLevel;
+ SkString fName;
+
+public:
+ BitmapFractionalBench( int is, const char *name, SkPaint::FilterLevel filterLevel ) {
+ fInputSize = is;
+ fOutputSize = 2*is;
+ fFilterLevel = filterLevel;
+ fName.printf( "bitmap_fractional_bench_%s", name );
+ }
+
+protected:
+
+ SkBitmap fInputBitmap, fOutputBitmap;
+ SkMatrix fMatrix;
+
+ virtual const char* onGetName() {
+ return fName.c_str();
+ }
+
+ int inputSize() const {
+ return fInputSize;
+ }
+
+ int outputSize() const {
+ return fOutputSize;
+ }
+
+ SkIPoint onGetSize() SK_OVERRIDE {
+ return SkIPoint::Make( fOutputSize, fOutputSize );
+ }
+
+ virtual void onPreDraw() {
+ fInputBitmap.allocN32Pixels(fInputSize, fInputSize, true);
+ fInputBitmap.eraseColor(SK_ColorWHITE);
+
+ fOutputBitmap.allocN32Pixels(fOutputSize, fOutputSize, true);
+ }
+
+ virtual void onDraw(const int loops, SkCanvas*) {
+ SkPaint paint;
+ this->setupPaint(&paint);
+
+ preBenchSetup();
+
+ SkCanvas canvas( fOutputBitmap );
+ paint.setFilterLevel(fFilterLevel);
+ fInputBitmap.notifyPixelsChanged();
+
+ for (int i = 0; i < loops; i++) {
+ // up-scale the image by a variety of close, fractional scales
+ for (int j = 0 ; j < 20 ; j++) {
+ fMatrix = SkMatrix::I();
+ fMatrix.setScale( 1 + j/500.f, 1 + j/500.f );
+ canvas.drawBitmapMatrix( fInputBitmap, fMatrix, &paint );
+ }
+ // down-scale the image by a variety of close, fractional scales
+ for (int j = 0 ; j < 20 ; j++) {
+ fMatrix = SkMatrix::I();
+ fMatrix.setScale( 1 - j/500.f, 1 - j/500.f );
+ canvas.drawBitmapMatrix( fInputBitmap, fMatrix, &paint );
+ }
+ // Now try some fractional translates
+ for (int j = 0 ; j < 20 ; j++) {
+ fMatrix = SkMatrix::I();
+ fMatrix.setTranslate( j/3.f, j/3.f );
+ canvas.drawBitmapMatrix( fInputBitmap, fMatrix, &paint );
+ }
+ // Finally, some fractional translates with non-identity scale.
+ for (int j = 0 ; j < 20 ; j++) {
+ fMatrix = SkMatrix::I();
+ fMatrix.setTranslate( j/3.f, j/3.f );
+ fMatrix.preScale( 1.5f, 1.5f );
+ canvas.drawBitmapMatrix( fInputBitmap, fMatrix, &paint );
+ }
+ }
+ }
+
+ virtual void preBenchSetup() {}
+private:
+ typedef Benchmark INHERITED;
+};
+
+DEF_BENCH(return new BitmapFractionalBench(256, "high", SkPaint::kHigh_FilterLevel);)
+DEF_BENCH(return new BitmapFractionalBench(256, "medium", SkPaint::kMedium_FilterLevel);)
+DEF_BENCH(return new BitmapFractionalBench(256, "low", SkPaint::kLow_FilterLevel);)
diff --git a/gyp/bench.gypi b/gyp/bench.gypi
index 92e0574..bc9c0d9 100644
--- a/gyp/bench.gypi
+++ b/gyp/bench.gypi
@@ -25,6 +25,7 @@
'../bench/AAClipBench.cpp',
'../bench/AlternatingColorPatternBench.cpp',
'../bench/BitmapBench.cpp',
+ '../bench/BitmapFractionalBench.cpp',
'../bench/BitmapRectBench.cpp',
'../bench/BitmapScaleBench.cpp',
'../bench/BlurBench.cpp',
