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/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, |context_3d|
  35   // 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   // If the format of |video_frame| is VideoFrame::NATIVE_TEXTURE, |context_3d|
  48   // must be provided.
  49   void Copy(const scoped_refptr<VideoFrame>& video_frame,
  50             SkCanvas* canvas,
  51             const Context3D& context_3d);
  52
  53   // Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
  54   // should point into a buffer large enough to hold as many 32 bit RGBA pixels
  55   // as are in the visible_rect() area of the frame.
  56   static void ConvertVideoFrameToRGBPixels(
  57       const scoped_refptr<media::VideoFrame>& video_frame,
  58       void* rgb_pixels,
  59       size_t row_bytes);
  60
  61   // Copy the contents of texture of |video_frame| to texture |texture|.
  62   // |level|, |internal_format|, |type| specify target texture |texture|.
  63   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
  64   static void CopyVideoFrameTextureToGLTexture(gpu::gles2::GLES2Interface* gl,
  65                                                VideoFrame* video_frame,
  66                                                unsigned int texture,
  67                                                unsigned int internal_format,
  68                                                unsigned int type,
  69                                                bool premultiply_alpha,
  70                                                bool flip_y);
  71
  72  private:
  73   void ResetLastFrame();
  74   void ResetAcceleratedLastFrame();
  75
  76   // An RGB bitmap and corresponding timestamp of the previously converted
  77   // video frame data by software color space conversion.
  78   SkBitmap last_frame_;
  79   base::TimeDelta last_frame_timestamp_;
  80   // If |last_frame_| is not used for a while, it's deleted to save memory.
  81   base::DelayTimer<SkCanvasVideoRenderer> frame_deleting_timer_;
  82
  83   // This is a hardware accelerated copy of the frame generated by
  84   // |accelerated_generator_|.
  85   // It's used when |canvas| parameter in Paint() is Ganesh canvas.
  86   // Note: all GrContext in SkCanvas instances are same.
  87   SkBitmap accelerated_last_frame_;
  88   VideoImageGenerator* accelerated_generator_;
  89   base::TimeDelta accelerated_last_frame_timestamp_;
  90   base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
  91
  92   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  93 };
  94
  95 }  // namespace media
  96
  97 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_