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 "media/filters/context_3d.h"
  14 #include "third_party/skia/include/core/SkBitmap.h"
  15 #include "third_party/skia/include/core/SkXfermode.h"
  16 #include "ui/gfx/geometry/rect.h"
  17
  18 class SkCanvas;
  19
  20 namespace media {
  21
  22 class VideoFrame;
  23 class VideoImageGenerator;
  24
  25 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
  26 // conversion and caching of resulting RGB bitmaps.
  27 class MEDIA_EXPORT SkCanvasVideoRenderer {
  28  public:
  29   SkCanvasVideoRenderer();
  30   ~SkCanvasVideoRenderer();
  31
  32   // Paints |video_frame| on |canvas|, scaling and rotating the result to fit
  33   // dimensions specified by |dest_rect|.
  34   // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE and |canvas|
  35   // is ganeshed, |context_3d| must be provided.
  36   //
  37   // Black will be painted on |canvas| if |video_frame| is null.
  38   void Paint(const scoped_refptr<VideoFrame>& video_frame,
  39              SkCanvas* canvas,
  40              const gfx::RectF& dest_rect,
  41              uint8 alpha,
  42              SkXfermode::Mode mode,
  43              VideoRotation video_rotation,
  44              const Context3D& context_3d);
  45
  46   // Copy |video_frame| on |canvas|.
  47   void Copy(const scoped_refptr<VideoFrame>&, SkCanvas* canvas);
  48
  49   // Copy the contents of texture of |video_frame| to texture |texture|.
  50   // |level|, |internal_format|, |type| specify target texture |texture|.
  51   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
  52   static void CopyVideoFrameTextureToGLTexture(gpu::gles2::GLES2Interface* gl,
  53                                                VideoFrame* video_frame,
  54                                                unsigned int texture,
  55                                                unsigned int level,
  56                                                unsigned int internal_format,
  57                                                unsigned int type,
  58                                                bool premultiply_alpha,
  59                                                bool flip_y);
  60
  61  private:
  62   void ResetLastFrame();
  63   void ResetAcceleratedLastFrame();
  64
  65   // An RGB bitmap and corresponding timestamp of the previously converted
  66   // video frame data by software color space conversion.
  67   SkBitmap last_frame_;
  68   base::TimeDelta last_frame_timestamp_;
  69   // If |last_frame_| is not used for a while, it's deleted to save memory.
  70   base::DelayTimer<SkCanvasVideoRenderer> frame_deleting_timer_;
  71
  72   // This is a hardware accelerated copy of the frame generated by
  73   // |accelerated_generator_|.
  74   // It's used when |canvas| parameter in Paint() is Ganesh canvas.
  75   // Note: all GrContext in SkCanvas instances are same.
  76   SkBitmap accelerated_last_frame_;
  77   VideoImageGenerator* accelerated_generator_;
  78   base::TimeDelta accelerated_last_frame_timestamp_;
  79   base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
  80
  81   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  82 };
  83
  84 }  // namespace media
  85
  86 #endif  // MEDIA_FILTERS_SKCANVAS_VIDEO_RENDERER_H_