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/timestamp_constants.h"
  13 #include "media/base/video_frame.h"
  14 #include "media/base/video_rotation.h"
  15 #include "media/filters/context_3d.h"
  16 #include "skia/ext/refptr.h"
  17 #include "third_party/skia/include/core/SkImage.h"
  18 #include "third_party/skia/include/core/SkXfermode.h"
  19
  20 class SkCanvas;
  21 class SkImage;
  22
  23 namespace gfx {
  24 class RectF;
  25 }
  26
  27 namespace media {
  28 class VideoImageGenerator;
  29
  30 // Handles rendering of VideoFrames to SkCanvases.
  31 class MEDIA_EXPORT SkCanvasVideoRenderer {
  32  public:
  33   SkCanvasVideoRenderer();
  34   ~SkCanvasVideoRenderer();
  35
  36   // Paints |video_frame| on |canvas|, scaling and rotating the result to fit
  37   // dimensions specified by |dest_rect|.
  38   // If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
  39   // must be provided.
  40   //
  41   // Black will be painted on |canvas| if |video_frame| is null.
  42   void Paint(const scoped_refptr<VideoFrame>& video_frame,
  43              SkCanvas* canvas,
  44              const gfx::RectF& dest_rect,
  45              uint8 alpha,
  46              SkXfermode::Mode mode,
  47              VideoRotation video_rotation,
  48              const Context3D& context_3d);
  49
  50   // Copy |video_frame| on |canvas|.
  51   // If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
  52   // must be provided.
  53   void Copy(const scoped_refptr<VideoFrame>& video_frame,
  54             SkCanvas* canvas,
  55             const Context3D& context_3d);
  56
  57   // Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
  58   // should point into a buffer large enough to hold as many 32 bit RGBA pixels
  59   // as are in the visible_rect() area of the frame.
  60   static void ConvertVideoFrameToRGBPixels(const media::VideoFrame* video_frame,
  61                                            void* rgb_pixels,
  62                                            size_t row_bytes);
  63
  64   // Copy the contents of texture of |video_frame| to texture |texture|.
  65   // |level|, |internal_format|, |type| specify target texture |texture|.
  66   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
  67   static void CopyVideoFrameSingleTextureToGLTexture(
  68       gpu::gles2::GLES2Interface* gl,
  69       VideoFrame* video_frame,
  70       unsigned int texture,
  71       unsigned int internal_format,
  72       unsigned int type,
  73       bool premultiply_alpha,
  74       bool flip_y);
  75
  76  private:
  77   void ResetCache();
  78
  79   // Last image used to draw to the canvas.
  80   skia::RefPtr<SkImage> last_image_;
  81   // Timestamp of the videoframe used to generate |last_image_|.
  82   base::TimeDelta last_timestamp_ = media::kNoTimestamp();
  83   // If |last_image_| is not used for a while, it's deleted to save memory.
  84   base::DelayTimer<SkCanvasVideoRenderer> last_image_deleting_timer_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
  87 };
  88
  89 }  // namespace media
  90
  91 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_