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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_OZONE_OZONE_PLATFORM_H_
      6 #define UI_OZONE_OZONE_PLATFORM_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "ui/ozone/ozone_export.h"
     10 
     11 namespace ui {
     12 
     13 class CursorFactoryOzone;
     14 class EventFactoryOzone;
     15 class NativeDisplayDelegate;
     16 class SurfaceFactoryOzone;
     17 class TouchscreenDeviceManager;
     18 class GpuPlatformSupport;
     19 class GpuPlatformSupportHost;
     20 
     21 // Base class for Ozone platform implementations.
     22 //
     23 // Ozone platforms must override this class and implement the virtual
     24 // GetFooFactoryOzone() methods to provide implementations of the
     25 // various ozone interfaces.
     26 //
     27 // The OzonePlatform subclass can own any state needed by the
     28 // implementation that is shared between the various ozone interfaces,
     29 // such as a connection to the windowing system.
     30 //
     31 // A platform is free to use different implementations of each
     32 // interface depending on the context. You can, for example, create
     33 // different objects depending on the underlying hardware, command
     34 // line flags, or whatever is appropriate for the platform.
     35 class OZONE_EXPORT OzonePlatform {
     36  public:
     37   OzonePlatform();
     38   virtual ~OzonePlatform();
     39 
     40   // Initializes the subsystems/resources necessary for the UI process (e.g.
     41   // events, surface, etc.)
     42   static void InitializeForUI();
     43 
     44   // Initializes the subsystems/resources necessary for the GPU process.
     45   static void InitializeForGPU();
     46 
     47   static OzonePlatform* GetInstance();
     48 
     49   // Factory getters to override in subclasses. The returned objects will be
     50   // injected into the appropriate layer at startup. Subclasses should not
     51   // inject these objects themselves. Ownership is retained by OzonePlatform.
     52   virtual ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() = 0;
     53   virtual ui::EventFactoryOzone* GetEventFactoryOzone() = 0;
     54   virtual ui::CursorFactoryOzone* GetCursorFactoryOzone() = 0;
     55   virtual ui::GpuPlatformSupport* GetGpuPlatformSupport() = 0;
     56   virtual ui::GpuPlatformSupportHost* GetGpuPlatformSupportHost() = 0;
     57 #if defined(OS_CHROMEOS)
     58   virtual scoped_ptr<ui::NativeDisplayDelegate>
     59       CreateNativeDisplayDelegate() = 0;
     60   virtual scoped_ptr<ui::TouchscreenDeviceManager>
     61       CreateTouchscreenDeviceManager() = 0;
     62 #endif
     63 
     64  private:
     65   virtual void InitializeUI() = 0;
     66   virtual void InitializeGPU() = 0;
     67 
     68   static void CreateInstance();
     69 
     70   static OzonePlatform* instance_;
     71 
     72   DISALLOW_COPY_AND_ASSIGN(OzonePlatform);
     73 };
     74 
     75 }  // namespace ui
     76 
     77 #endif  // UI_OZONE_OZONE_PLATFORM_H_
     78