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

ui/ozone/platform/drm/common/native_pixmap_manager_gbm.cc

 // Copyright 2015 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/common/native_pixmap_manager_gbm.h"
 
 #include "base/file_descriptor_posix.h"
+#include "ui/ozone/platform/drm/gpu/vgem_pixmap.h"
 
 namespace ui {
 
+namespace {
+
+NativePixmap::BufferUsage NativePixmapBufferUsageFromSurfaceFactoryOzone(
+    SurfaceFactoryOzone::BufferUsage usage) {
+  switch (usage) {
+    case SurfaceFactoryOzone::MAP:
+      return NativePixmap::MAP;
+    case SurfaceFactoryOzone::PERSISTENT_MAP:
+      return NativePixmap::PERSISTENT_MAP;
+    case SurfaceFactoryOzone::SCANOUT:
+      return NativePixmap::SCANOUT;
+  }
+  NOTREACHED();
+  return NativePixmap::SCANOUT;
+}
+}
+
 NativePixmapManager* CreateNativePixmapManagerGbm() {
   return new NativePixmapManagerGbm();
 }
 
 NativePixmapManagerGbm::NativePixmapManagerGbm() {
 }
 
 NativePixmapManagerGbm::~NativePixmapManagerGbm() {
 }
 
 void NativePixmapManagerGbm::Initialize(const base::FileDescriptor& device_fd) {
   DCHECK_EQ(vgem_fd_.get(), -1);
   if (device_fd.fd > 0)
     vgem_fd_.reset(device_fd.fd);
 }
 
 std::vector<NativePixmapManager::Configuration>
 NativePixmapManagerGbm::GetSupportedNativePixmapConfigurations() const {
   std::vector<Configuration> configurations = {
       {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::SCANOUT},
       {SurfaceFactoryOzone::RGBX_8888, SurfaceFactoryOzone::SCANOUT}};
+  // Map requires VGEM supports.
+  if (vgem_fd_.is_valid()) {
+    configurations.push_back(
+        {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::MAP});
+  }
   return configurations;
 }
 
+scoped_refptr<NativePixmap> NativePixmapManagerGbm::CreateFromFileDescriptor(
+    base::FileDescriptor handle,
+    gfx::Size size,
+    SurfaceFactoryOzone::BufferFormat format,
+    SurfaceFactoryOzone::BufferUsage usage) {
+  scoped_refptr<VgemPixmap> pixmap(new VgemPixmap(
+      handle, base::FileDescriptor(vgem_fd_.get(), false), size, format,
+      NativePixmapBufferUsageFromSurfaceFactoryOzone(usage)));
+  if (!pixmap->Initialize())
+    return nullptr;
+
+  return pixmap;
+}
+
 }  // namespace ui