media: Refactor SkCanvasVideoRenderer to use SkImages and not SkBitmaps.

media/blink/skcanvas_video_renderer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_
 #define MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "media/base/media_export.h"
+#include "media/base/video_frame.h"
 #include "media/base/video_rotation.h"
 #include "media/filters/context_3d.h"
-#include "third_party/skia/include/core/SkBitmap.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/rect.h"
 
 class SkCanvas;
+class SkImage;
 
 namespace media {
-
-class VideoFrame;
 class VideoImageGenerator;
 
-// Handles rendering of VideoFrames to SkCanvases, doing any necessary YUV
-// conversion and caching of resulting RGB bitmaps.
+// Handles rendering of VideoFrames to SkCanvases.
 class MEDIA_EXPORT SkCanvasVideoRenderer {
  public:
   SkCanvasVideoRenderer();
   ~SkCanvasVideoRenderer();
 
   // Paints |video_frame| on |canvas|, scaling and rotating the result to fit
   // dimensions specified by |dest_rect|.
   // If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
   // must be provided.
   //
   // Black will be painted on |canvas| if |video_frame| is null.
   void Paint(const scoped_refptr<VideoFrame>& video_frame,
              SkCanvas* canvas,
              const gfx::RectF& dest_rect,
              uint8 alpha,
              SkXfermode::Mode mode,
              VideoRotation video_rotation,
              const Context3D& context_3d);
 
   // Copy |video_frame| on |canvas|.
   // If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
   // must be provided.
   void Copy(const scoped_refptr<VideoFrame>& video_frame,
             SkCanvas* canvas,
             const Context3D& context_3d);
 
   // Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
   // should point into a buffer large enough to hold as many 32 bit RGBA pixels
   // as are in the visible_rect() area of the frame.
-  static void ConvertVideoFrameToRGBPixels(
-      const scoped_refptr<media::VideoFrame>& video_frame,
-      void* rgb_pixels,
-      size_t row_bytes);
+  static void ConvertVideoFrameToRGBPixels(const media::VideoFrame* video_frame,
+                                           void* rgb_pixels,
+                                           size_t row_bytes);
 
   // Copy the contents of texture of |video_frame| to texture |texture|.
   // |level|, |internal_format|, |type| specify target texture |texture|.
   // The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
   static void CopyVideoFrameSingleTextureToGLTexture(
       gpu::gles2::GLES2Interface* gl,
       VideoFrame* video_frame,
       unsigned int texture,
       unsigned int internal_format,
       unsigned int type,
       bool premultiply_alpha,
       bool flip_y);
 
  private:
-  void ResetLastFrame();
-  void ResetAcceleratedLastFrame();
+  void ResetCache();
 
-  // An RGB bitmap and corresponding timestamp of the previously converted
-  // video frame data by software color space conversion.
-  SkBitmap last_frame_;
-  base::TimeDelta last_frame_timestamp_;
-  // If |last_frame_| is not used for a while, it's deleted to save memory.
-  base::DelayTimer<SkCanvasVideoRenderer> frame_deleting_timer_;
-
-  // This is a hardware accelerated copy of the frame generated by
-  // |accelerated_generator_|.
-  // It's used when |canvas| parameter in Paint() is Ganesh canvas.
-  // Note: all GrContext in SkCanvas instances are same.
-  scoped_ptr<SkImage> accelerated_last_image_;
-  SkBitmap accelerated_last_frame_;
-  VideoImageGenerator* accelerated_generator_;
-  base::TimeDelta accelerated_last_frame_timestamp_;
-  base::DelayTimer<SkCanvasVideoRenderer> accelerated_frame_deleting_timer_;
+  // Last image used to draw to the canvas.
+  skia::RefPtr<SkImage> last_image_;
+  // Timestamp of the videoframe used to generate |last_image_|.
+  base::TimeDelta last_timestamp_ = media::kNoTimestamp();
+  // If |last_image_| is not used for a while, it's deleted to save memory.
+  base::DelayTimer<SkCanvasVideoRenderer> last_image_deleting_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_SKCANVAS_VIDEO_RENDERER_H_