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

ui/ozone/platform/drm/gbm_surface_factory.cc

Index: ui/ozone/platform/drm/gbm_surface_factory.cc
diff --git a/ui/ozone/platform/drm/gbm_surface_factory.cc b/ui/ozone/platform/drm/gbm_surface_factory.cc
index afe8d2cb6644f929ee2bda09965fbf291c5e95f6..c4150aab587c5ba541101948d4f36160f1b1b30e 100644
--- a/ui/ozone/platform/drm/gbm_surface_factory.cc
+++ b/ui/ozone/platform/drm/gbm_surface_factory.cc
@@ -8,6 +8,7 @@
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
+#include "base/posix/eintr_wrapper.h"
 #include "third_party/khronos/EGL/egl.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/ozone/common/egl_util.h"
@@ -71,10 +72,24 @@ class SingleOverlay : public OverlayCandidatesOzone {
   DISALLOW_COPY_AND_ASSIGN(SingleOverlay);
 };
 
+bool ShareToRenderProcess(int fd, base::FileDescriptor* new_handle) {
+  int duped_handle = HANDLE_EINTR(dup(fd));
+  if (duped_handle < 0) {
+    DPLOG(ERROR) << "dup() failed.";
+    *new_handle = base::FileDescriptor();
+    return false;
+  }
+
+  *new_handle = base::FileDescriptor(duped_handle, true);
+  return true;
+}
+
 }  // namespace
 
 GbmSurfaceFactory::GbmSurfaceFactory(bool allow_surfaceless)
-    : DrmSurfaceFactory(NULL), allow_surfaceless_(allow_surfaceless) {
+    : DrmSurfaceFactory(NULL),
+      allow_surfaceless_(allow_surfaceless),
+      drm_device_manager_(nullptr) {
 }
 
 GbmSurfaceFactory::~GbmSurfaceFactory() {
@@ -151,14 +166,11 @@ scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
     gfx::Size size,
     BufferFormat format,
     BufferUsage usage) {
-  if (usage == MAP)
-    return nullptr;
-
   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;
 
@@ -169,6 +181,38 @@ scoped_refptr<ui::NativePixmap> GbmSurfaceFactory::CreateNativePixmap(
   return pixmap;
 }
 
+gfx::GpuMemoryBufferHandle GbmSurfaceFactory::ExportGpuMemoryBufferHandle(
+    gfx::AcceleratedWidget widget,
+    scoped_refptr<NativePixmap> pixmap) {
+  scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
+  DCHECK(gbm);
+
+  base::FileDescriptor dup_handle;
+  if (!ShareToRenderProcess(pixmap->GetDmaBufFd(), &dup_handle)) {
+    DLOG(ERROR) << "Fail to duplicate a DMA-BUF file descriptor";
+    return gfx::GpuMemoryBufferHandle();
+  }
+
+  int vgem_fd = drm_device_manager_->GetVgemDevice()->get_fd();
+  if (vgem_fd < 0) {
+    LOG(ERROR) << "This device doesn't support VGEM.";
+    return gfx::GpuMemoryBufferHandle();
+  }
+
+  base::FileDescriptor dup_device_handle;
+  if (!ShareToRenderProcess(vgem_fd, &dup_device_handle)) {
+    base::ScopedFD fd(dup_handle.fd);
+    LOG(ERROR) << "Fail to duplicate a VGEM file descriptor";
+    return gfx::GpuMemoryBufferHandle();
+  }
+
+  gfx::GpuMemoryBufferHandle handle;
+  handle.type = gfx::OZONE_NATIVE_BUFFER;
+  handle.handle = dup_handle;
+  handle.device_handle = dup_device_handle;
+  return handle;
+}
+
 OverlayCandidatesOzone* GbmSurfaceFactory::GetOverlayCandidates(
     gfx::AcceleratedWidget w) {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
@@ -199,15 +243,18 @@ bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   return allow_surfaceless_;
 }
 
-bool GbmSurfaceFactory::CanCreateNativePixmap(BufferUsage usage) {
-  switch (usage) {
-    case MAP:
-      return false;
-    case SCANOUT:
-      return true;
-  }
-  NOTREACHED();
-  return false;
+std::vector<SurfaceFactoryOzone::Configuration>
+GbmSurfaceFactory::GetSupportedNativePixmapConfigurations() const {
+  std::vector<Configuration> configurations;
+  configurations.push_back(
+      {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::SCANOUT});
+  configurations.push_back(
+      {SurfaceFactoryOzone::RGBX_8888, SurfaceFactoryOzone::SCANOUT});
+  // MAP is supported on the device, which supports VGEM.
+  if (drm_device_manager_ && drm_device_manager_->GetVgemDevice())
+    configurations.push_back(
+        {SurfaceFactoryOzone::BGRA_8888, SurfaceFactoryOzone::MAP});
+  return configurations;
 }
 
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(