Implement DRM Native Pixmap using prime buffer

ui/ozone/platform/drm/client_native_pixmap_factory_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/client_native_pixmap_factory_gbm.h"
 
 #include <utility>
 
+#include "base/command_line.h"
 #include "base/macros.h"
 #include "ui/gfx/native_pixmap_handle_ozone.h"
+#include "ui/ozone/platform/drm/common/client_native_pixmap_dmabuf.h"
 #include "ui/ozone/public/client_native_pixmap_factory.h"  // nogncheck
+#include "ui/ozone/public/ozone_switches.h"
 
 #if defined(USE_VGEM_MAP)
 #include "ui/ozone/platform/drm/common/client_native_pixmap_vgem.h"
 #endif
 
 namespace ui {
 
 namespace {
 
 class ClientNativePixmapGbm : public ClientNativePixmap {
@@ skipping 29 matching lines @@
                                 gfx::BufferUsage usage) const override {
     switch (usage) {
       case gfx::BufferUsage::GPU_READ:
       case gfx::BufferUsage::SCANOUT:
         return format == gfx::BufferFormat::RGBA_8888 ||
                format == gfx::BufferFormat::RGBX_8888 ||
                format == gfx::BufferFormat::BGRA_8888 ||
                format == gfx::BufferFormat::BGRX_8888;
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT: {
+        if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+                switches::kOzoneUseDmaBufMmap))

[spang, 2016/03/21 23:24:20]

Check the command line in the constructor or Initialize().

[vignatti (out of this project), 2016/03/22 20:24:29]

I was actually thinking about removing the cmd line option altogether with the
vgem support now. 

+          return format == gfx::BufferFormat::BGRA_8888;
 #if defined(USE_VGEM_MAP)
         return vgem_fd_.is_valid() && format == gfx::BufferFormat::BGRA_8888;
 #else
         return false;
 #endif
       }
     }
     NOTREACHED();
     return false;
   }
   scoped_ptr<ClientNativePixmap> ImportFromHandle(
       const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferUsage usage) override {
     base::ScopedFD scoped_fd(handle.fd.fd);
 
     switch (usage) {
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
       case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
+        if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+                switches::kOzoneUseDmaBufMmap))
+          return ClientNativePixmapDmaBuf::ImportFromDmabuf(
+              scoped_fd.get(), size, handle.stride);
 #if defined(USE_VGEM_MAP)
         // A valid |vgem_fd_| is required to acquire a VGEM bo. |vgem_fd_| is
         // set before a widget is created.
         DCHECK_GE(vgem_fd_.get(), 0);
         return ClientNativePixmapVgem::ImportFromDmabuf(
             vgem_fd_.get(), scoped_fd.get(), size, handle.stride);
 #endif
         NOTREACHED();
         return nullptr;
       case gfx::BufferUsage::GPU_READ:
@@ skipping 11 matching lines @@
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ClientNativePixmapFactoryGbm);
 };
 
 ClientNativePixmapFactory* CreateClientNativePixmapFactoryGbm() {
   return new ClientNativePixmapFactoryGbm();
 }
 
 }  // namespace ui