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/memory/ref_counted.h"
   9 #include "base/time/time.h"
  10 #include "media/base/media_export.h"
  11 #include "media/base/video_rotation.h"
  12 #include "third_party/skia/include/core/SkBitmap.h"
  13 #include "third_party/skia/include/core/SkXfermode.h"
  14 #include "ui/gfx/rect.h"
  15
  16 class SkCanvas;
  17
  18 namespace media {
  19
  20 class VideoFrame;
  21 class VideoImageGenerator;
  22
  23 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
  24 // conversion and caching of resulting RGB bitmaps.
  25 class MEDIA_EXPORT SkCanvasVideoRenderer {
  26  public:
  27   SkCanvasVideoRenderer();
  28   ~SkCanvasVideoRenderer();
  29
  30   // Paints |video_frame| on |canvas|, scaling the result to fit dimensions
  31   // specified by |dest_rect|.
  32   //
  33   // Black will be painted on |canvas| if |video_frame| is null.
  34   void Paint(const scoped_refptr<VideoFrame>& video_frame,
  35              SkCanvas* canvas,
  36              const gfx::RectF& dest_rect,
  37              uint8 alpha,
  38              SkXfermode::Mode mode,
  39              VideoRotation video_rotation);
  40
  41   // Copy |video_frame| on |canvas|.
  42   void Copy(const scoped_refptr<VideoFrame>&, SkCanvas* canvas);
  43
  44  private:
  45   VideoImageGenerator* generator_;
  46
  47   // An RGB bitmap and corresponding timestamp of the previously converted
  48   // video frame data.
  49   SkBitmap last_frame_;
  50   base::TimeDelta last_frame_timestamp_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  53 };
  54
  55 }  // namespace media
  56
  57 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_