[Chromoting] Fallback to use software renderer if desktop image size is larger than GPU limitaiton

remoting/client/plugin/pepper_video_renderer_3d.h

 // Copyright 2014 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 REMOTING_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_3D_H_
 #define REMOTING_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_3D_H_
 
 #include <stdint.h>
 
 #include <list>
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "ppapi/cpp/graphics_3d.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/video_decoder.h"
 #include "ppapi/utility/completion_callback_factory.h"
 #include "remoting/client/plugin/pepper_video_renderer.h"
+#include "remoting/client/plugin/pepper_video_renderer_2d.h"
 #include "remoting/protocol/video_stub.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 
 struct PPB_OpenGLES2;
 
 namespace remoting {
 
 namespace protocol {
 class FrameStatsConsumer;
 }  // namespace protocol
@@ skipping 23 matching lines @@
   // protocol::VideoStub interface.
   void ProcessVideoPacket(std::unique_ptr<VideoPacket> packet,
                           const base::Closure& done) override;
 
  private:
   // Class responsible for tracking state of a frame until it's rendered.
   class FrameTracker;
 
   class Picture;
 
+  // A structure which contains OpenGl hardware limitations.
+  struct GlLimits {

[Sergey Ulanov, 2016/10/17 20:02:44]

I don't think you really need this struct given that it's used in only one
place.

[Hzj_jie, 2016/10/17 22:55:43]

Done.

+    int texture_size;
+    int viewport_size[2];
+  };
+
   // Callback for pp::VideoDecoder::Initialize().
   void OnInitialized(int32_t result);
 
   // Passes one picture from |pending_frames_| to the |video_decoder_|.
   void DecodeNextPacket();
 
   // Callback for pp::VideoDecoder::Decode().
   void OnDecodeDone(int32_t result);
 
   // Fetches next picture from the |video_decoder_|.
@@ skipping 55 matching lines @@
   std::list<std::unique_ptr<FrameTracker>> next_picture_frames_;
 
   // The current picture shown on the screen or being rendered. Must be deleted
   // before |video_decoder_|.
   std::unique_ptr<Picture> current_picture_;
 
   // FrameTrackers for frames in |current_picture_|. The queue is emptied once
   // the |current_picture_| is rendered.
   std::list<std::unique_ptr<FrameTracker>> current_picture_frames_;
 
+  // The fallback software renderer, if input video packet size is larger than
+  // hardware limitation.
+  PepperVideoRenderer2D fallback_renderer_;
+  bool use_fallback_renderer_ = false;
+
   // Set to true if the screen has been resized and needs to be repainted.
   bool force_repaint_ = false;
 
   // The texture type for which |shader_program| was initialized. Can be either
   // 0, GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_ARB or GL_TEXTURE_EXTERNAL_OES. 0
   // indicates that |shader_program_| hasn't been intialized.
   uint32_t current_shader_program_texture_target_ = 0;
 
   // Shader program ID.
   unsigned int shader_program_ = 0;
 
   // Location of the scale value to be passed to the |shader_program_|.
   int shader_texcoord_scale_location_ = 0;
 
   // True if the renderer has received frame from the host.
   bool frame_received_ = false;
 
   // True if dirty regions are to be sent to |event_handler_| for debugging.
   bool debug_dirty_region_ = false;
 
   pp::CompletionCallbackFactory<PepperVideoRenderer3D> callback_factory_;
 
+  // The hardware limitation.
+  GlLimits gl_limits_;
+
   DISALLOW_COPY_AND_ASSIGN(PepperVideoRenderer3D);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_PLUGIN_PEPPER_VIDEO_RENDERER_3D_H_