NotForReview: Implement zero/one-copy texture for ozone freon using Intel DRM

ui/ozone/platform/drm/gpu/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/gpu/gbm_surface_factory.h"
 
 #include <gbm.h>
 
 #include "base/files/file_path.h"
 #include "third_party/khronos/EGL/egl.h"
 #include "ui/ozone/common/egl_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_device_manager.h"
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
 #include "ui/ozone/platform/drm/gpu/gbm_device.h"
 #include "ui/ozone/platform/drm/gpu/gbm_surface.h"
 #include "ui/ozone/platform/drm/gpu/gbm_surfaceless.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 #include "ui/ozone/platform/drm/gpu/screen_manager.h"
 #include "ui/ozone/public/native_pixmap.h"
 #include "ui/ozone/public/surface_ozone_canvas.h"
 #include "ui/ozone/public/surface_ozone_egl.h"
 
+#if defined(OZONE_USE_VGEM_MAP)
+#include "base/command_line.h"
+#include "ui/ozone/platform/drm/gpu/intel_drm_pixmap.h"
+#include "ui/ozone/public/ozone_switches.h"
+#endif
+
 namespace ui {
 
 GbmSurfaceFactory::GbmSurfaceFactory(bool allow_surfaceless)
     : DrmSurfaceFactory(nullptr),
       allow_surfaceless_(allow_surfaceless),
       drm_device_manager_(nullptr) {}
 
 GbmSurfaceFactory::~GbmSurfaceFactory() {
   DCHECK(thread_checker_.CalledOnValidThread());
 }
@@ skipping 77 matching lines @@
     gfx::BufferUsage usage) {
 #if !defined(OS_CHROMEOS)
   // Support for memory mapping accelerated buffers requires some
   // CrOS-specific patches (using vgem).
   DCHECK_EQ(gfx::BufferUsage::SCANOUT, usage);
 #endif
 
   scoped_refptr<GbmDevice> gbm = GetGbmDevice(widget);
   DCHECK(gbm);
 
+#if defined(OZONE_USE_VGEM_MAP)
+  bool enable_intel_drm = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kOzoneUseIntelDrm);
+  if (enable_intel_drm && usage == gfx::BufferUsage::MAP) {
+    scoped_refptr<IntelDrmPixmap> pixmap = IntelDrmPixmap::Create(
+        base::FileDescriptor(gbm->get_fd(), false), format, size);
+    if (!pixmap.get())
+      return nullptr;
+    return pixmap;
+  }
+#endif
+
   scoped_refptr<GbmBuffer> buffer =
       GbmBuffer::CreateBuffer(gbm, format, size, usage);
   if (!buffer.get())
     return nullptr;
 
   scoped_refptr<GbmPixmap> pixmap(new GbmPixmap(buffer, screen_manager_));
   if (!pixmap->Initialize())
     return nullptr;
 
   return pixmap;
 }
 
 bool GbmSurfaceFactory::CanShowPrimaryPlaneAsOverlay() {
   DCHECK(thread_checker_.CalledOnValidThread());
   return allow_surfaceless_;
 }
 
 scoped_refptr<GbmDevice> GbmSurfaceFactory::GetGbmDevice(
     gfx::AcceleratedWidget widget) {
   return static_cast<GbmDevice*>(
       drm_device_manager_->GetDrmDevice(widget).get());
 }
 
 }  // namespace ui