12-bit vp9 video support

cc/resources/video_resource_updater.h

 // Copyright 2013 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 CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 #define CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 62 matching lines @@
 class CC_EXPORT VideoResourceUpdater
     : public base::SupportsWeakPtr<VideoResourceUpdater> {
  public:
   VideoResourceUpdater(ContextProvider* context_provider,
                        ResourceProvider* resource_provider);
   ~VideoResourceUpdater();
 
   VideoFrameExternalResources CreateExternalResourcesFromVideoFrame(
       scoped_refptr<media::VideoFrame> video_frame);
 
+  // Convert an array of short integers into an array of half-floats.
+  // |src| is an array of integers in range 0 .. 2^{bits_per_channel} - 1
+  // |num| is number of entries in input and output array.
+  // The numbers stored in |dst| will be half floats in range 0.0..1.0
+  static void MakeHalfFloats(const uint16_t* src,
+                             int bits_per_channel,
+                             size_t num,
+                             uint16_t* dst);
+
  private:
   class PlaneResource {
    public:
     PlaneResource(unsigned resource_id,
                   const gfx::Size& resource_size,
                   ResourceFormat resource_format,
                   gpu::Mailbox mailbox);
     PlaneResource(const PlaneResource& other);
 
     // Returns true if this resource matches the unique identifiers of another
@@ skipping 87 matching lines @@
   // Recycle resources so that we can reduce the number of allocations and
   // data transfers.
   ResourceList all_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_