ozone: Allocate scanout buffers according to KMS modifiers.

ui/ozone/platform/drm/gpu/drm_thread.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/gpu/drm_thread.h"
 
 #include <gbm.h>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 107 matching lines @@
       break;
     case gfx::BufferUsage::SCANOUT:
       flags = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING;
       break;
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
       flags = GBM_BO_USE_LINEAR;
       break;
   }
 
-  *buffer = GbmBuffer::CreateBuffer(
-      gbm, ui::GetFourCCFormatFromBufferFormat(format), size, flags);
+  DrmWindow* window = screen_manager_->GetWindow(widget);
+  std::vector<uint64_t> modifiers;
+
+  uint32_t fourcc_format = ui::GetFourCCFormatFromBufferFormat(format);
+
+  // TODO(hoegsberg): We shouldn't really get here without a window,
+  // but it happens during init. Need to figure out why.
+  if (window && window->GetController())
+    modifiers = window->GetController()->GetFormatModifiers(fourcc_format);
+
+  if (modifiers.size() > 0 && !(flags & GBM_BO_USE_LINEAR))
+    *buffer = GbmBuffer::CreateBufferWithModifiers(gbm, fourcc_format, size,
+                                                   flags, modifiers);
+  else
+    *buffer = GbmBuffer::CreateBuffer(gbm, fourcc_format, size, flags);
 }
 
 void DrmThread::CreateBufferFromFds(
     gfx::AcceleratedWidget widget,
     const gfx::Size& size,
     gfx::BufferFormat format,
     std::vector<base::ScopedFD>&& fds,
     const std::vector<gfx::NativePixmapPlane>& planes,
     scoped_refptr<GbmBuffer>* buffer) {
   scoped_refptr<GbmDevice> gbm =
@@ skipping 134 matching lines @@
                                        correction_matrix);
 }
 
 // DrmThread requires a BindingSet instead of a simple Binding because it will
 // be used from multiple threads in multiple processes.
 void DrmThread::AddBinding(ozone::mojom::DeviceCursorRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 }  // namespace ui