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

ui/ozone/platform/drm/gbm_surface_factory.cc

 // Copyright 2014 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.
 
 #include "ui/ozone/platform/drm/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 132 matching lines @@
     return nullptr;
 
   return make_scoped_ptr(new GbmSurfaceless(screen_manager_->GetWindow(widget),
                                             drm_device_manager_));
 }
 
 scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,
     BufferFormat format,
-    BufferUsage usage) {
-  if (usage == MAP)
-    return nullptr;
-
+    BufferUsage usage,
+    gfx::GpuMemoryBufferHandle* handle) {
+  DCHECK(handle || usage == SCANOUT);
   scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
   DCHECK(gbm);
 
   scoped_refptr<GbmBuffer> buffer =
-      GbmBuffer::CreateBuffer(gbm, format, size, true);
+      GbmBuffer::CreateBuffer(gbm, format, size, usage == SCANOUT);
   if (!buffer.get())
     return nullptr;
 
   scoped_refptr<GbmPixmap> pixmap(new GbmPixmap(buffer));
   if (!pixmap->Initialize())
     return nullptr;
 
+  if (usage == MAP) {
+    DCHECK(handle);
+    pixmap->ExportDmaBuf(drm_device_manager_->GetVgemDevice(), handle);
+  }
+
   return pixmap;
 }
 
 OverlayCandidatesOzone* GbmSurfaceFactory::GetOverlayCandidates(
     gfx::AcceleratedWidget w) {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kOzoneTestSingleOverlaySupport))
     return new SingleOverlay();
   return NULL;
 }
@@ skipping 16 matching lines @@
   return true;
 }
 
 bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   return allow_surfaceless_;
 }
 
 bool GbmSurfaceFactory::CanCreateNativePixmap(BufferUsage usage) {
   switch (usage) {
     case MAP:
-      return false;
     case SCANOUT:
       return true;
   }
   NOTREACHED();
   return false;
 }
 
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(
       drm_device_manager_->GetDrmDevice(widget).get());
 }
 
 }  // namespace ui