ozone: Implement zero/one-copy texture for Ozone GBM.

ui/ozone/public/surface_factory_ozone.h

 // Copyright (c) 2013 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 UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 #define UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/native_library.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/gpu_memory_buffer.h"

[reveman, 2015/05/14 13:22:03]

I don't think you should include this here for circular dependency reasons.

Can we use base::FileDescriptor below instead of gfx::GpuMemoryBufferHandle?

[dshwang, 2015/05/14 14:58:15]

as I'll remove |device_handle| in GpuMemoryBufferHandle, export method will
return just base::FileDescriptor as you mentioned.

 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/overlay_transform.h"
 #include "ui/ozone/ozone_base_export.h"
 
 class SkBitmap;
 class SkCanvas;
 
 namespace ui {
 
 class NativePixmap;
@@ skipping 42 matching lines @@
     BGRA_8888,
     RGBX_8888,
     RGB_888,
   };
 
   enum BufferUsage {
     MAP,
     SCANOUT,
   };
 
+  struct Configuration {
+    BufferFormat format;
+    BufferUsage usage;
+  };
+
   typedef void* (*GLGetProcAddressProc)(const char* name);
   typedef base::Callback<void(base::NativeLibrary)> AddGLLibraryCallback;
   typedef base::Callback<void(GLGetProcAddressProc)>
       SetGLGetProcAddressProcCallback;
 
   SurfaceFactoryOzone();
   virtual ~SurfaceFactoryOzone();
 
   // Returns the singleton instance.
   static SurfaceFactoryOzone* GetInstance();
@@ skipping 42 matching lines @@
 
   // Create a single native buffer to be used for overlay planes or zero copy
   // for |widget| representing a particular display controller or default
   // display controller for kNullAcceleratedWidget.
   virtual scoped_refptr<NativePixmap> CreateNativePixmap(
       gfx::AcceleratedWidget widget,
       gfx::Size size,
       BufferFormat format,
       BufferUsage usage);
 
+  // Export GpuMemoryBufferHandle from |pixmap|.
+  virtual gfx::GpuMemoryBufferHandle ExportGpuMemoryBufferHandle(
+      gfx::AcceleratedWidget widget,
+      scoped_refptr<NativePixmap> pixmap);
+
   // Sets the overlay plane to switch to at the next page flip.
   // |w| specifies the screen to display this overlay plane on.
   // |plane_z_order| specifies the stacking order of the plane relative to the
   // main framebuffer located at index 0.
   // |plane_transform| specifies how the buffer is to be transformed during.
   // composition.
   // |buffer| to be presented by the overlay.
   // |display_bounds| specify where it is supposed to be on the screen.
   // |crop_rect| specifies the region within the buffer to be placed
   // inside |display_bounds|. This is specified in texture coordinates, in the
   // range of [0,1].
   virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                     int plane_z_order,
                                     gfx::OverlayTransform plane_transform,
                                     scoped_refptr<NativePixmap> buffer,
                                     const gfx::Rect& display_bounds,
                                     const gfx::RectF& crop_rect);
 
   // Returns true if overlays can be shown at z-index 0, replacing the main
   // surface. Combined with surfaceless extensions, it allows for an
   // overlay-only mode.
   virtual bool CanShowPrimaryPlaneAsOverlay();
 
-  // Returns true if the platform is able to create buffers for a specific usage
-  // such as MAP for zero copy or SCANOUT for display controller.
-  virtual bool CanCreateNativePixmap(BufferUsage usage);
+  // Gets supported format/usage configurations.
+  virtual std::vector<Configuration> GetSupportedNativePixmapConfigurations()
+      const;
 
  private:
   static SurfaceFactoryOzone* impl_;  // not owned
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_SURFACE_FACTORY_OZONE_H_