Revised sub-rectangle scaling for use in Chromoting.

media/tools/scaler_bench/scaler_bench.cc

Index: media/tools/scaler_bench/scaler_bench.cc
diff --git a/media/tools/scaler_bench/scaler_bench.cc b/media/tools/scaler_bench/scaler_bench.cc
index aa8e227d5ec0cb00898abda358e81842cb30ff9b..af0e22e2610b2acfabccc8742b12f90dcaaaae54 100644
--- a/media/tools/scaler_bench/scaler_bench.cc
+++ b/media/tools/scaler_bench/scaler_bench.cc
@@ -152,6 +152,47 @@ static double BenchmarkFilter(media::ScaleFilter filter) {
   return static_cast<double>((end - start).InMilliseconds()) / num_frames;
 }
 
+static double BenchmarkScaleWithRect() {
+  std::vector<scoped_refptr<VideoFrame> > source_frames;
+  std::vector<scoped_refptr<VideoFrame> > dest_frames;
+
+  for (int i = 0; i < num_buffers; i++) {
+    source_frames.push_back(
+        VideoFrame::CreateBlackFrame(source_width, source_height));
+
+    dest_frames.push_back(
+        VideoFrame::CreateFrame(VideoFrame::RGB32,
+                                dest_width,
+                                dest_height,
+                                TimeDelta::FromSeconds(0),
+                                TimeDelta::FromSeconds(0)));
+  }
+
+  TimeTicks start = TimeTicks::HighResNow();
+  for (int i = 0; i < num_frames; i++) {
+    scoped_refptr<VideoFrame> source_frame = source_frames[i % num_buffers];
+    scoped_refptr<VideoFrame> dest_frame = dest_frames[i % num_buffers];
+
+    media::ScaleYUVToRGB32WithRect(
+        source_frame->data(VideoFrame::kYPlane),
+        source_frame->data(VideoFrame::kUPlane),
+        source_frame->data(VideoFrame::kVPlane),
+        dest_frame->data(0),
+        source_width,
+        source_height,
+        dest_width,
+        dest_height,
+        0, 0,
+        dest_width,
+        dest_height,
+        source_frame->stride(VideoFrame::kYPlane),
+        source_frame->stride(VideoFrame::kUPlane),
+        dest_frame->stride(0));
+  }
+  TimeTicks end = TimeTicks::HighResNow();
+  return static_cast<double>((end - start).InMilliseconds()) / num_frames;
+}
+
 int main(int argc, const char** argv) {
   CommandLine::Init(argc, argv);
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
@@ -231,6 +272,8 @@ int main(int argc, const char** argv) {
             << "ms/frame" << std::endl;
   std::cout << "Bilinear: " << BenchmarkFilter(media::FILTER_BILINEAR)
             << "ms/frame" << std::endl;
+  std::cout << "Bilinear with rect: " << BenchmarkScaleWithRect()
+            << "ms/frame" << std::endl;
 
   return 0;
 }