Add --timescale to bench_record and bench_playback.

tools/bench_playback.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "BenchTimer.h"
 #include "SkCommandLineFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkOSFile.h"
 #include "SkPicture.h"
 #include "SkRecordDraw.h"
 #include "SkRecordOpts.h"
 #include "SkRecorder.h"
 #include "SkStream.h"
 #include "SkString.h"
 
 __SK_FORCE_IMAGE_DECODER_LINKING;
 
 DEFINE_string2(skps, r, "skps", "Directory containing SKPs to read and re-record.");
 DEFINE_int32(loops, 10, "Number of times to play back each SKP.");
 DEFINE_bool(skr, false, "Play via SkRecord instead of SkPicture.");
 DEFINE_int32(tile, 1000000000, "Simulated tile size.");
 DEFINE_string(match, "", "The usual filters on file names of SKPs to bench.");
+DEFINE_string(timescale, "ms", "Print times in ms, us, or ns");
+
+static double scale_time(double ms) {
+    if (FLAGS_timescale.contains("us")) ms *= 1000;
+    if (FLAGS_timescale.contains("ns")) ms *= 1000000;
+    return ms;
+}
 
 static void bench(SkPMColor* scratch, SkPicture& src, const char* name) {
     // We don't use the public SkRecording interface here because we need kWriteOnly_Mode.
     // (We don't want SkPicturePlayback to be able to optimize playing into our SkRecord.)
     SkRecord record;
     SkRecorder recorder(SkRecorder::kWriteOnly_Mode, &record, src.width(), src.height());
     src.draw(&recorder);
 
     SkRecordOptimize(&record);
 
     SkAutoTDelete<SkCanvas> canvas(SkCanvas::NewRasterDirectN32(src.width(),
                                                                 src.height(),
                                                                 scratch,
                                                                 src.width() * sizeof(SkPMColor)));
     canvas->clipRect(SkRect::MakeWH(SkIntToScalar(FLAGS_tile), SkIntToScalar(FLAGS_tile)));
 
     BenchTimer timer;
     timer.start();
     for (int i = 0; i < FLAGS_loops; i++) {
         if (FLAGS_skr) {
             SkRecordDraw(record, canvas.get());
         } else {
             src.draw(canvas.get());
         }
     }
     timer.end();
 
     const double msPerLoop = timer.fCpu / (double)FLAGS_loops;
-    printf("%u\t%s\n", unsigned(1000 * msPerLoop), name);
+    printf("%f\t%s\n", scale_time(msPerLoop), name);
 }
 
 int tool_main(int argc, char** argv);
 int tool_main(int argc, char** argv) {
     SkCommandLineFlags::Parse(argc, argv);
     SkAutoGraphics autoGraphics;
 
     // We share a single scratch bitmap among benches to reduce the profile noise from allocation.
     static const int kMaxArea = 209825221;  // tabl_mozilla is this big.
     SkAutoTMalloc<SkPMColor> scratch(kMaxArea);
@@ skipping 31 matching lines @@
         bench(scratch.get(), *src, filename.c_str());
     }
     return failed ? 1 : 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif