rendering_helper - Warm up the rendering.

content/common/gpu/media/rendering_helper.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 CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_
 #define CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_
 
 #include <map>
 #include <queue>
 #include <vector>
@@ skipping 34 matching lines @@
   ~VideoFrameTexture();
 };
 
 struct RenderingHelperParams {
   RenderingHelperParams();
   ~RenderingHelperParams();
 
   // The rendering FPS.
   int rendering_fps;
 
+  // The number of empty frames rendered when the rendering helper is
+  // initialized.
+  int warm_up_iterations;
+
   // The desired size of each window. We play each stream in its own window
   // on the screen.
   std::vector<gfx::Size> window_sizes;
 
   // The members below are only used for the thumbnail mode where all frames
   // are rendered in sequence onto one FBO for comparison/verification purposes.
 
   // Whether the frames are rendered as scaled thumbnails within a
   // larger FBO that is in turn rendered to the window.
   bool render_as_thumbnails;
@@ skipping 77 matching lines @@
     std::queue<scoped_refptr<VideoFrameTexture> > pending_frames;
 
     RenderedVideo();
     ~RenderedVideo();
   };
 
   void Clear();
 
   void RenderContent();
 
+  void WarmUpRendering(int warm_up_iterations);
+
   void LayoutRenderingAreas(const std::vector<gfx::Size>& window_sizes);
 
   // Render |texture_id| to the current view port of the screen using target
   // |texture_target|.
   void RenderTexture(uint32 texture_target, uint32 texture_id);
 
   base::MessageLoop* message_loop_;
 
   scoped_refptr<gfx::GLContext> gl_context_;
   scoped_refptr<gfx::GLSurface> gl_surface_;
@@ skipping 14 matching lines @@
   base::TimeDelta frame_duration_;
   base::TimeTicks scheduled_render_time_;
   base::CancelableClosure render_task_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_RENDERING_HELPER_H_