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 "base/timer/timer.h"
  11 #include "media/base/media_export.h"
  12 #include "media/base/video_rotation.h"
  13 #include "third_party/skia/include/core/SkBitmap.h"
  14 #include "third_party/skia/include/core/SkXfermode.h"
  15 #include "ui/gfx/rect.h"
  16
  17 class SkCanvas;
  18
  19 namespace media {
  20
  21 class VideoFrame;
  22 class VideoImageGenerator;
  23
  24 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
  25 // conversion and caching of resulting RGB bitmaps.
  26 class MEDIA_EXPORT SkCanvasVideoRenderer {
  27  public:
  28   SkCanvasVideoRenderer();
  29   ~SkCanvasVideoRenderer();
  30
  31   // Paints |video_frame| on |canvas|, scaling and rotating the result to fit
  32   // dimensions specified by |dest_rect|.
  33   //
  34   // Black will be painted on |canvas| if |video_frame| is null.
  35   void Paint(const scoped_refptr<VideoFrame>& video_frame,
  36              SkCanvas* canvas,
  37              const gfx::RectF& dest_rect,
  38              uint8 alpha,
  39              SkXfermode::Mode mode,
  40              VideoRotation video_rotation);
  41
  42   // Copy |video_frame| on |canvas|.
  43   void Copy(const scoped_refptr<VideoFrame>&, SkCanvas* canvas);
  44
  45  private:
  46   void ResetLastFrame();
  47   void ResetAcceleratedLastFrame();
  48
  49   // An RGB bitmap and corresponding timestamp of the previously converted
  50   // video frame data by software color space conversion.
  51   SkBitmap last_frame_;
  52   base::TimeDelta last_frame_timestamp_;
  53   // If |last_frame_| is not used for a while, it's deleted to save memory.
  54   base::DelayTimer<SkCanvasVideoRenderer> frame_deleting_timer_;
  55
  56   // This is a hardware accelerated copy of the frame generated by
  57   // |accelerated_generator_|.
  58   // It's used when |canvas| parameter in Paint() is Ganesh canvas.
  59   // Note: all GrContext in SkCanvas instances are same.
  60   SkBitmap accelerated_last_frame_;
  61   VideoImageGenerator* accelerated_generator_;
  62   base::TimeDelta accelerated_last_frame_timestamp_;
  63   base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  66 };
  67
  68 }  // namespace media
  69
  70 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_