skia/ext/benchmarking_canvas.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SKIA_EXT_BENCHMARKING_CANVAS_H_
   6 #define SKIA_EXT_BENCHMARKING_CANVAS_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "skia/ext/refptr.h"
  10 #include "third_party/skia/include/utils/SkNWayCanvas.h"
  11 #include "third_party/skia/src/utils/debugger/SkDebugCanvas.h"
  12
  13 namespace skia {
  14
  15 class TimingCanvas;
  16
  17 class SK_API BenchmarkingCanvas : public SkNWayCanvas {
  18 public:
  19   BenchmarkingCanvas(int width, int height);
  20   virtual ~BenchmarkingCanvas();
  21
  22   // Returns the number of draw commands executed on this canvas.
  23   size_t CommandCount() const;
  24
  25   // Get draw command info for a given index.
  26   SkDrawCommand* GetCommand(size_t index);
  27
  28   // Return the recorded render time (milliseconds) for a draw command index.
  29   double GetTime(size_t index);
  30
  31 private:
  32   // In order to avoid introducing a Skia version dependency, this
  33   // implementation dispatches draw commands in lock-step to two distinct
  34   // canvases:
  35   //   * a SkDebugCanvas used for gathering command info and tracking
  36   //     the current command index
  37   //   * a SkiaTimingCanvas used for measuring raster paint times (and relying
  38   //     on the former for tracking the current command index).
  39   //
  40   // This way, if the SkCanvas API is extended, we don't need to worry about
  41   // updating content::SkiaTimingCanvas to accurately override all new methods
  42   // (to avoid timing info indices from getting out of sync), as SkDebugCanvas
  43   // already does that for us.
  44
  45   skia::RefPtr<SkDebugCanvas> debug_canvas_;
  46   skia::RefPtr<TimingCanvas> timing_canvas_;
  47 };
  48
  49 }
  50 #endif // SKIA_EXT_BENCHMARKING_CANVAS_H