ui/ozone/public/surface_factory_ozone.h

   1 // Copyright (c) 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_PUBLIC_SURFACE_FACTORY_OZONE_H_
   6 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/native_library.h"
  11 #include "ui/gfx/geometry/point.h"
  12 #include "ui/gfx/geometry/rect.h"
  13 #include "ui/gfx/native_widget_types.h"
  14 #include "ui/gfx/overlay_transform.h"
  15 #include "ui/gfx/rect.h"
  16 #include "ui/ozone/ozone_base_export.h"
  17
  18 class SkBitmap;
  19 class SkCanvas;
  20
  21 namespace ui {
  22
  23 class NativePixmap;
  24 class OverlayCandidatesOzone;
  25 class SurfaceOzoneCanvas;
  26 class SurfaceOzoneEGL;
  27
  28 // The Ozone interface allows external implementations to hook into Chromium to
  29 // provide a system specific implementation. The Ozone interface supports two
  30 // drawing modes: 1) accelerated drawing through EGL and 2) software drawing
  31 // through Skia.
  32 //
  33 // If you want to paint on a window with ozone, you need to create a
  34 // SurfaceOzoneEGL or SurfaceOzoneCanvas for that window. The platform can
  35 // support software, EGL, or both for painting on the window.
  36 // The following functionality is specific to the drawing mode and may not have
  37 // any meaningful implementation in the other mode. An implementation must
  38 // provide functionality for at least one mode.
  39 //
  40 // 1) Accelerated Drawing (EGL path):
  41 //
  42 // The following functions are specific to EGL:
  43 //  - GetNativeDisplay
  44 //  - LoadEGLGLES2Bindings
  45 //  - GetEGLSurfaceProperties (optional if the properties match the default
  46 //  Chromium ones).
  47 //  - CreateEGLSurfaceForWidget
  48 //
  49 // 2) Software Drawing (Skia):
  50 //
  51 // The following function is specific to the software path:
  52 //  - CreateCanvasForWidget
  53 //
  54 // The accelerated path can optionally provide support for the software drawing
  55 // path.
  56 //
  57 // The remaining functions are not covered since they are needed in both drawing
  58 // modes (See comments bellow for descriptions).
  59 class OZONE_BASE_EXPORT SurfaceFactoryOzone {
  60  public:
  61   // Describes overlay buffer format.
  62   // TODO: this is a placeholder for now and will be populated with more
  63   // formats once we know what sorts of content, video, etc. we can support.
  64   enum BufferFormat {
  65     UNKNOWN,
  66     RGBA_8888,
  67     RGB_888,
  68   };
  69
  70   typedef void* (*GLGetProcAddressProc)(const char* name);
  71   typedef base::Callback<void(base::NativeLibrary)> AddGLLibraryCallback;
  72   typedef base::Callback<void(GLGetProcAddressProc)>
  73       SetGLGetProcAddressProcCallback;
  74
  75   SurfaceFactoryOzone();
  76   virtual ~SurfaceFactoryOzone();
  77
  78   // Returns the singleton instance.
  79   static SurfaceFactoryOzone* GetInstance();
  80
  81   // Returns native platform display handle. This is used to obtain the EGL
  82   // display connection for the native display.
  83   virtual intptr_t GetNativeDisplay();
  84
  85   // Create SurfaceOzoneEGL for the specified gfx::AcceleratedWidget.
  86   //
  87   // Note: When used from content, this is called in the GPU process. The
  88   // platform must support creation of SurfaceOzoneEGL from the GPU process
  89   // using only the handle contained in gfx::AcceleratedWidget.
  90   virtual scoped_ptr<SurfaceOzoneEGL> CreateEGLSurfaceForWidget(
  91       gfx::AcceleratedWidget widget);
  92
  93   // Create SurfaceOzoneCanvas for the specified gfx::AcceleratedWidget.
  94   //
  95   // Note: The platform must support creation of SurfaceOzoneCanvas from the
  96   // Browser Process using only the handle contained in gfx::AcceleratedWidget.
  97   virtual scoped_ptr<SurfaceOzoneCanvas> CreateCanvasForWidget(
  98       gfx::AcceleratedWidget widget);
  99
 100   // Sets up GL bindings for the native surface. Takes two callback parameters
 101   // that allow Ozone to register the GL bindings.
 102   virtual bool LoadEGLGLES2Bindings(
 103       AddGLLibraryCallback add_gl_library,
 104       SetGLGetProcAddressProcCallback set_gl_get_proc_address) = 0;
 105
 106   // Returns an array of EGL properties, which can be used in any EGL function
 107   // used to select a display configuration. Note that all properties should be
 108   // immediately followed by the corresponding desired value and array should be
 109   // terminated with EGL_NONE. Ownership of the array is not transferred to
 110   // caller. desired_list contains list of desired EGL properties and values.
 111   virtual const int32* GetEGLSurfaceProperties(const int32* desired_list);
 112
 113   // Get the hal struct to check for overlay support.
 114   virtual OverlayCandidatesOzone* GetOverlayCandidates(
 115       gfx::AcceleratedWidget w);
 116
 117   // Cleate a single native buffer to be used for overlay planes.
 118   virtual scoped_refptr<NativePixmap> CreateNativePixmap(
 119       gfx::Size size,
 120       BufferFormat format);
 121
 122   // Returns true if overlays can be shown at z-index 0, replacing the main
 123   // surface. Combined with surfaceless extensions, it allows for an
 124   // overlay-only mode.
 125   virtual bool CanShowPrimaryPlaneAsOverlay();
 126
 127  private:
 128   static SurfaceFactoryOzone* impl_;  // not owned
 129 };
 130
 131 }  // namespace ui
 132
 133 #endif  // UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_