Allow switching to SwiftShader when GPU is blacklisted

content/browser/gpu/gpu_data_manager.h

 // Copyright (c) 2011 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_BROWSER_GPU_GPU_DATA_MANAGER_H_
 #define CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_H_
 #pragma once
 
 #include <set>
 #include <string>
 
+#include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list_threadsafe.h"
 #include "base/synchronization/lock.h"
 #include "base/task.h"
 #include "base/values.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_feature_flags.h"
 #include "content/public/common/gpu_info.h"
 
@@ skipping 98 matching lines @@
   // TODO(zmo): Get rid of preliminary because it should not be exposed to
   // outside GpuDataManager.
   void UpdateGpuBlacklist(GpuBlacklist* updated_list, bool preliminary);
 
   // This gets called when switching GPU might have happened.
   void HandleGpuSwitch();
 
   // Returns the Gpu Info as a DictionaryValue.
   DictionaryValue* GpuInfoAsDictionaryValue() const;
 
+  // Returns true if the software rendering should currently be used.
+  bool SoftwareRendering();

[Zhenyao Mo, 2011/11/10 18:34:34]

According to coding style, this should be software_rendering() instead of
SoftwareRendering().

+
+  // Register a path to the SwiftShader software renderer.
+  void RegisterSwiftShaderPath(FilePath path);
+
  private:
   class UserFlags {
    public:
     UserFlags();
 
     void Initialize();
 
     bool disable_accelerated_2d_canvas() const {
       return disable_accelerated_2d_canvas_;
     }
@@ skipping 64 matching lines @@
   // If it's a different GPU, then reset and copy over everything.
   // Return true if something changes that may affect blacklisting; currently
   // they are device_id, vendor_id, driver_vendor, driver_version, driver_date,
   // and gl_renderer.
   static bool Merge(content::GPUInfo* object, const content::GPUInfo& other);
 
   // Determin if accelerated-2d-canvas is supported, which depends on whether
   // lose_context could happen and whether skia is the backend.
   bool supportsAccelerated2dCanvas() const;
 
+  // Try to switch to software rendering, if possible and necessary.
+  void EnableSoftwareRenderingIfNecessary();
+
   bool complete_gpu_info_already_requested_;
 
   GpuFeatureFlags gpu_feature_flags_;
   GpuFeatureFlags preliminary_gpu_feature_flags_;
 
   UserFlags user_flags_;
 
   content::GPUInfo gpu_info_;
   mutable base::Lock gpu_info_lock_;
 
   scoped_ptr<GpuBlacklist> gpu_blacklist_;
 
   // Observers.
   const scoped_refptr<GpuDataManagerObserverList> observer_list_;
 
   ListValue log_messages_;
+  bool software_rendering_;
+
+  FilePath swiftshader_path_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuDataManager);
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_H_