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

ui/ozone/public/surface_factory_ozone.h

Index: ui/ozone/public/surface_factory_ozone.h
diff --git a/ui/ozone/public/surface_factory_ozone.h b/ui/ozone/public/surface_factory_ozone.h
index e73813dd011b1fef2a45d2d124def7bac0fb0b6b..8bfd5ae7004ddb7f4d7929c2283b10fd41d92888 100644
--- a/ui/ozone/public/surface_factory_ozone.h
+++ b/ui/ozone/public/surface_factory_ozone.h
@@ -11,6 +11,7 @@
 #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"
@@ -73,6 +74,11 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
     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)>
@@ -135,6 +141,11 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
       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
@@ -158,9 +169,9 @@ class OZONE_BASE_EXPORT SurfaceFactoryOzone {
   // 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