gpu video: optimize HW video to SW canvas and implement it for WebRTC.

media/base/video_frame.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_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/md5.h"
 #include "base/memory/shared_memory.h"
 #include "base/synchronization/lock.h"
 #include "media/base/buffers.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 #if defined(OS_MACOSX)
 #include <CoreVideo/CVPixelBuffer.h>
 #include "base/mac/scoped_cftyperef.h"
 #endif
 
-class SkBitmap;
-
 namespace gpu {
 struct MailboxHolder;
 }  // namespace gpu
 
 namespace media {
 
 class MEDIA_EXPORT VideoFrame : public base::RefCountedThreadSafe<VideoFrame> {
  public:
   enum {
     kFrameSizeAlignment = 16,
@@ skipping 51 matching lines @@
   // can be used to DCHECK() plane parameters.
   static bool IsValidPlane(size_t plane, VideoFrame::Format format);
 
   // Call prior to CreateFrame to ensure validity of frame configuration. Called
   // automatically by VideoDecoderConfig::IsValidConfig().
   // TODO(scherkus): VideoDecoderConfig shouldn't call this method
   static bool IsValidConfig(Format format, const gfx::Size& coded_size,
                             const gfx::Rect& visible_rect,
                             const gfx::Size& natural_size);
 
-  // CB to write pixels from the texture backing this frame into the
-  // |const SkBitmap&| parameter.
-  typedef base::Callback<void(const SkBitmap&)> ReadPixelsCB;
-
   // CB to be called on the mailbox backing this frame when the frame is
   // destroyed.
   typedef base::Callback<void(uint32)> ReleaseMailboxCB;
 
   // Wraps a native texture of the given parameters with a VideoFrame.  The
   // backing of the VideoFrame is held in the mailbox held by |mailbox_holder|,
   // and |mailbox_holder_release_cb| will be called with |mailbox_holder| as the
   // argument when the VideoFrame is to be destroyed.
   // |read_pixels_cb| may be used to do (slow!) readbacks from the
   // texture to main memory.
   static scoped_refptr<VideoFrame> WrapNativeTexture(
       scoped_ptr<gpu::MailboxHolder> mailbox_holder,
       const ReleaseMailboxCB& mailbox_holder_release_cb,
       const gfx::Size& coded_size,
       const gfx::Rect& visible_rect,
       const gfx::Size& natural_size,
       base::TimeDelta timestamp,
-      const ReadPixelsCB& read_pixels_cb,
       bool allow_overlay);
 
-#if !defined(MEDIA_FOR_CAST_IOS)
-  // Read pixels from the native texture backing |*this| and write
-  // them to |pixels| as BGRA.  |pixels| must point to a buffer at
-  // least as large as 4 * visible_rect().size().GetArea().
-  void ReadPixelsFromNativeTexture(const SkBitmap& pixels);
-#endif
-
   // Wraps packed image data residing in a memory buffer with a VideoFrame.
   // The image data resides in |data| and is assumed to be packed tightly in a
   // buffer of logical dimensions |coded_size| with the appropriate bit depth
   // and plane count as given by |format|.  The shared memory handle of the
   // backing allocation, if present, can be passed in with |handle|.  When the
   // frame is destroyed, |no_longer_needed_cb.Run()| will be called.
   // Returns NULL on failure.
   static scoped_refptr<VideoFrame> WrapExternalPackedMemory(
       Format format,
       const gfx::Size& coded_size,
@@ skipping 248 matching lines @@
   // of the surface divided by the horizontal sampling period.  Note that
   // strides can be negative.
   int32 strides_[kMaxPlanes];
 
   // Array of data pointers to each plane.
   uint8* data_[kMaxPlanes];
 
   // Native texture mailbox, if this is a NATIVE_TEXTURE frame.
   const scoped_ptr<gpu::MailboxHolder> mailbox_holder_;
   ReleaseMailboxCB mailbox_holder_release_cb_;
-  ReadPixelsCB read_pixels_cb_;
 
   // Shared memory handle, if this frame was allocated from shared memory.
   base::SharedMemoryHandle shared_memory_handle_;
 
   // Offset in shared memory buffer.
   size_t shared_memory_offset_;
 
 #if defined(OS_POSIX)
   // Dmabufs for each plane, if this frame is wrapping memory
   // acquired via dmabuf.
@@ skipping 15 matching lines @@
   const bool end_of_stream_;
 
   bool allow_overlay_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_H_