base/gfx/img_resize_perftest.cc

// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stdlib.h>
#include <time.h>

#include "base/perftimer.h"
#include "base/gfx/convolver.h"
#include "base/gfx/image_operations.h"
#include "base/gfx/image_resizer.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace {

void FillRandomData(char* dest, int byte_count) {
  srand(static_cast<unsigned>(time(NULL)));
  for (int i = 0; i < byte_count; i++)
    dest[i] = rand() * 255 / RAND_MAX;
}

}  // namespace

// Old code gives [1521, 1519]ms for this, 4000x4000 -> 2100x2100 lanczos8

TEST(ImageResizePerf, BigFilter) {
  static const int kSrcWidth = 4000;
  static const int kSrcHeight = 4000;
  static const int kSrcByteSize = kSrcWidth * kSrcHeight * 4;

  SkBitmap src_bmp;
  src_bmp.setConfig(SkBitmap::kARGB_8888_Config, kSrcWidth, kSrcHeight);
  src_bmp.allocPixels();
  FillRandomData(reinterpret_cast<char*>(src_bmp.getAddr32(0, 0)),
                 kSrcByteSize);

  // Make the dest size > 1/2 so the 50% optimization doesn't kick in.
  static const int kDestWidth = 1400;
  static const int kDestHeight = 1400;

  PerfTimeLogger resize_timer("resize");
  gfx::ImageResizer resizer(gfx::ImageResizer::LANCZOS3);
  SkBitmap dest = resizer.Resize(src_bmp, kDestWidth, kDestHeight);
}

// The original image filter we were using took 523ms for this test, while this
// one takes 857ms.
// TODO(brettw) make this at least 64% faster.
TEST(ImageOperationPerf, BigFilter) {
  static const int kSrcWidth = 4000;
  static const int kSrcHeight = 4000;
  static const int kSrcByteSize = kSrcWidth * kSrcHeight * 4;

  SkBitmap src_bmp;
  src_bmp.setConfig(SkBitmap::kARGB_8888_Config, kSrcWidth, kSrcHeight);
  src_bmp.allocPixels();
  src_bmp.setIsOpaque(true);
  FillRandomData(reinterpret_cast<char*>(src_bmp.getAddr32(0, 0)),
                 kSrcByteSize);

  // Make the dest size > 1/2 so the 50% optimization doesn't kick in.
  static const int kDestWidth = 1400;
  static const int kDestHeight = 1400;

  PerfTimeLogger resize_timer("resize");
  SkBitmap dest = gfx::ImageOperations::Resize(src_bmp,
      gfx::ImageOperations::RESIZE_LANCZOS3, (float)kDestWidth / (float)kSrcWidth,
      (float)kDestHeight / (float)kSrcHeight);
}