ozone: Allocate scanout buffer according to KMS modifiers

ui/ozone/platform/drm/gpu/hardware_display_controller.h

 // 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.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_HARDWARE_DISPLAY_CONTROLLER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_HARDWARE_DISPLAY_CONTROLLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <xf86drmMode.h>
@@ skipping 109 matching lines @@
   // called again before the page flip occurrs.
   void SchedulePageFlip(const OverlayPlaneList& plane_list,
                         const PageFlipCallback& callback);
 
   // Returns true if the page flip with the |plane_list| would succeed. This
   // doesn't change any state.
   bool TestPageFlip(const OverlayPlaneList& plane_list);
 
   bool IsFormatSupported(uint32_t fourcc_format, uint32_t z_order) const;
 
+  // Add GBM usage flags to |flags| as needed for the |format| and

[Daniele Castagna, 2016/12/20 18:03:28]

Does this comment need to be updated with the new GetFormatModifiers definition?

[hoegsberg1, 2016/12/22 23:05:21]

Acknowledged.

+  // |flags| passed in. This lets a controller set additional flags to
+  // make sure the allocated buffer can be scanned out.
+  std::vector<uint64_t> GetFormatModifiers(uint32_t format);
+
   // Set the hardware cursor to show the contents of |surface|.
   bool SetCursor(const scoped_refptr<ScanoutBuffer>& buffer);
 
   bool UnsetCursor();
 
   // Moves the hardware cursor to |location|.
   bool MoveCursor(const gfx::Point& location);
 
   void AddCrtc(std::unique_ptr<CrtcController> controller);
   std::unique_ptr<CrtcController> RemoveCrtc(
@@ skipping 31 matching lines @@
   gfx::Point origin_;
 
   bool is_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayController);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_HARDWARE_DISPLAY_CONTROLLER_H_