media/filters/skcanvas_video_renderer.h

   1 // Copyright (c) 2012 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 MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
   6 #define MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_
   7
   8 #include "base/time/time.h"
   9 #include "media/base/media_export.h"
  10 #include "third_party/skia/include/core/SkBitmap.h"
  11 #include "ui/gfx/rect.h"
  12
  13 class SkCanvas;
  14
  15 namespace media {
  16
  17 class VideoFrame;
  18
  19 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
  20 // conversion and caching of resulting RGB bitmaps.
  21 class MEDIA_EXPORT SkCanvasVideoRenderer {
  22  public:
  23   SkCanvasVideoRenderer();
  24   ~SkCanvasVideoRenderer();
  25
  26   // Paints |video_frame| on |canvas|, scaling the result to fit dimensions
  27   // specified by |dest_rect|.
  28   //
  29   // Black will be painted on |canvas| if |video_frame| is null.
  30   void Paint(media::VideoFrame* video_frame,
  31              SkCanvas* canvas,
  32              const gfx::RectF& dest_rect,
  33              uint8 alpha);
  34
  35  private:
  36   // An RGB bitmap and corresponding timestamp of the previously converted
  37   // video frame data.
  38   SkBitmap last_frame_;
  39   base::TimeDelta last_frame_timestamp_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  42 };
  43
  44 }  // namespace media
  45
  46 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_