cc: Allow overlay candidates with transforms.

ui/ozone/platform/drm/gpu/hardware_display_plane_manager_legacy.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/hardware_display_plane_manager_legacy.h"
 
 #include <errno.h>
 
 #include "base/bind.h"
 #include "ui/ozone/platform/drm/gpu/crtc_controller.h"
@@ skipping 87 matching lines @@
   return ret;
 }
 
 bool HardwareDisplayPlaneManagerLegacy::SetPlaneData(
     HardwareDisplayPlaneList* plane_list,
     HardwareDisplayPlane* hw_plane,
     const OverlayPlane& overlay,
     uint32_t crtc_id,
     const gfx::Rect& src_rect,
     CrtcController* crtc) {
+  // Legacy modesetting rejects transforms.
+  if (overlay.plane_transform != gfx::OVERLAY_TRANSFORM_NONE)
+    return false;
   if ((hw_plane->type() == HardwareDisplayPlane::kDummy) ||
       plane_list->legacy_page_flips.empty() ||
       plane_list->legacy_page_flips.back().crtc_id != crtc_id) {
     plane_list->legacy_page_flips.push_back(
         HardwareDisplayPlaneList::PageFlipInfo(
             crtc_id, overlay.buffer->GetOpaqueFramebufferId(), crtc));
   } else {
     plane_list->legacy_page_flips.back().planes.push_back(
         HardwareDisplayPlaneList::PageFlipInfo::Plane(
             hw_plane->plane_id(), overlay.buffer->GetFramebufferId(),
             overlay.display_bounds, src_rect));
   }
   return true;
 }
 
 }  // namespace ui