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_frame.h"
  13 #include "media/base/video_rotation.h"
  14 #include "media/filters/context_3d.h"
  15 #include "skia/ext/refptr.h"
  16 #include "third_party/skia/include/core/SkImage.h"
  17 #include "third_party/skia/include/core/SkXfermode.h"
  18 #include "ui/gfx/geometry/rect.h"
  19
  20 class SkCanvas;
  21 class SkImage;
  22
  23 namespace media {
  24 class VideoImageGenerator;
  25
  26 // Handles rendering of VideoFrames to SkCanvases.
  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 PIXEL_FORMAT_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 PIXEL_FORMAT_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(const media::VideoFrame* video_frame,
  57                                            void* rgb_pixels,
  58                                            size_t row_bytes);
  59
  60   // Copy the contents of texture of |video_frame| to texture |texture|.
  61   // |level|, |internal_format|, |type| specify target texture |texture|.
  62   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
  63   static void CopyVideoFrameSingleTextureToGLTexture(
  64       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 ResetCache();
  74
  75   // Last image used to draw to the canvas.
  76   skia::RefPtr<SkImage> last_image_;
  77   // Timestamp of the videoframe used to generate |last_image_|.
  78   base::TimeDelta last_timestamp_ = media::kNoTimestamp();
  79   // If |last_image_| is not used for a while, it's deleted to save memory.
  80   base::DelayTimer<SkCanvasVideoRenderer> last_image_deleting_timer_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  83 };
  84
  85 }  // namespace media
  86
  87 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_