ozone: support gfx::BufferFormat::RGBX_8888 as a native pixmap format.

ui/ozone/platform/drm/gpu/drm_window.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/drm_window.h"
 
 #include <drm_fourcc.h>
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 140 matching lines @@
 
   OverlayPlaneList compatible_test_list;
   scoped_refptr<DrmDevice> drm = controller_->GetAllocationDrmDevice();
   for (const auto& overlay : overlays) {
     OverlayCheck_Params overlay_params(overlay);
     gfx::Size size =
         (overlay.plane_z_order == 0) ? bounds().size() : overlay.buffer_size;
     scoped_refptr<ScanoutBuffer> buffer;
     // Check if we can re-use existing buffers.
     for (const auto& plane : last_submitted_planes_) {
-      uint32_t format = GetFourCCFormatFromBufferFormat(overlay.format);
-      // We always use a storage type of XRGB, even if the pixel format
-      // is ARGB.
-      if (format == DRM_FORMAT_ARGB8888)
-        format = DRM_FORMAT_XRGB8888;
-
+      uint32_t format = GetFourCCFormatForFramebuffer(overlay.format);
       if (plane.buffer->GetFramebufferPixelFormat() == format &&
           plane.z_order == overlay.plane_z_order &&
           plane.display_bounds == overlay.display_rect &&
           plane.buffer->GetSize() == size) {
         buffer = plane.buffer;
         break;
       }
     }
 
     if (!buffer)
@@ skipping 120 matching lines @@
       if (!cursor_buffers_[i]->Initialize(
               info, false /* should_register_framebuffer */)) {
         LOG(FATAL) << "Failed to initialize cursor buffer";
         return;
       }
     }
   }
 }
 
 }  // namespace ui