media/blink/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_BLINK_SKCANVAS_VIDEO_RENDERER_H_
   6 #define MEDIA_BLINK_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/SkImage.h"
  16 #include "third_party/skia/include/core/SkXfermode.h"
  17 #include "ui/gfx/geometry/rect.h"
  18
  19 class SkCanvas;
  20
  21 namespace media {
  22
  23 class VideoFrame;
  24 class VideoImageGenerator;
  25
  26 // Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
  27 // conversion and caching of resulting RGB bitmaps.
  28 class MEDIA_EXPORT SkCanvasVideoRenderer {
  29  public:
  30   SkCanvasVideoRenderer();
  31   ~SkCanvasVideoRenderer();
  32
  33   // Paints |video_frame| on |canvas|, scaling and rotating the result to fit
  34   // dimensions specified by |dest_rect|.
  35   // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE, |context_3d|
  36   // must be provided.
  37   //
  38   // Black will be painted on |canvas| if |video_frame| is null.
  39   void Paint(const scoped_refptr<VideoFrame>& video_frame,
  40              SkCanvas* canvas,
  41              const gfx::RectF& dest_rect,
  42              uint8 alpha,
  43              SkXfermode::Mode mode,
  44              VideoRotation video_rotation,
  45              const Context3D& context_3d);
  46
  47   // Copy |video_frame| on |canvas|.
  48   // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE, |context_3d|
  49   // must be provided.
  50   void Copy(const scoped_refptr<VideoFrame>& video_frame,
  51             SkCanvas* canvas,
  52             const Context3D& context_3d);
  53
  54   // Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
  55   // should point into a buffer large enough to hold as many 32 bit RGBA pixels
  56   // as are in the visible_rect() area of the frame.
  57   static void ConvertVideoFrameToRGBPixels(
  58       const scoped_refptr<media::VideoFrame>& video_frame,
  59       void* rgb_pixels,
  60       size_t row_bytes);
  61
  62   // Copy the contents of texture of |video_frame| to texture |texture|.
  63   // |level|, |internal_format|, |type| specify target texture |texture|.
  64   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
  65   static void CopyVideoFrameSingleTextureToGLTexture(
  66       gpu::gles2::GLES2Interface* gl,
  67       VideoFrame* video_frame,
  68       unsigned int texture,
  69       unsigned int internal_format,
  70       unsigned int type,
  71       bool premultiply_alpha,
  72       bool flip_y);
  73
  74  private:
  75   void ResetLastFrame();
  76   void ResetAcceleratedLastFrame();
  77
  78   // An RGB bitmap and corresponding timestamp of the previously converted
  79   // video frame data by software color space conversion.
  80   SkBitmap last_frame_;
  81   base::TimeDelta last_frame_timestamp_;
  82   // If |last_frame_| is not used for a while, it's deleted to save memory.
  83   base::DelayTimer<SkCanvasVideoRenderer> frame_deleting_timer_;
  84
  85   // This is a hardware accelerated copy of the frame generated by
  86   // |accelerated_generator_|.
  87   // It's used when |canvas| parameter in Paint() is Ganesh canvas.
  88   // Note: all GrContext in SkCanvas instances are same.
  89   scoped_ptr<SkImage> accelerated_last_image_;
  90   SkBitmap accelerated_last_frame_;
  91   VideoImageGenerator* accelerated_generator_;
  92   base::TimeDelta accelerated_last_frame_timestamp_;
  93   base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  96 };
  97
  98 }  // namespace media
  99
 100 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_