ozone: Remove primary plane optimization.

ui/ozone/platform/drm/gpu/hardware_display_plane_manager.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.h"
 
 #include <drm_fourcc.h>
 
 #include <set>
 #include <utility>
@@ skipping 214 matching lines @@
     const OverlayPlaneList& overlay_list,
     uint32_t crtc_id,
     CrtcController* crtc) {
   int crtc_index = LookupCrtcIndex(crtc_id);
   if (crtc_index < 0) {
     LOG(ERROR) << "Cannot find crtc " << crtc_id;
     return false;
   }
 
   size_t plane_idx = 0;
-  HardwareDisplayPlane* primary_plane = nullptr;
-  gfx::Rect primary_display_bounds;
   for (const auto& plane : overlay_list) {
     HardwareDisplayPlane* hw_plane =
         FindNextUnusedPlane(&plane_idx, crtc_index, plane);
     if (!hw_plane) {
       LOG(ERROR) << "Failed to find a free plane for crtc " << crtc_id;
       ResetCurrentPlaneList(plane_list);
       return false;
     }
 
     gfx::Rect fixed_point_rect;
-    uint32_t fourcc_format = plane.buffer->GetFramebufferPixelFormat();
     if (hw_plane->type() != HardwareDisplayPlane::kDummy) {
       const gfx::Size& size = plane.buffer->GetSize();
       gfx::RectF crop_rect = plane.crop_rect;
       crop_rect.Scale(size.width(), size.height());
 
       // This returns a number in 16.16 fixed point, required by the DRM overlay
       // APIs.
       auto to_fixed_point =
           [](double v) -> uint32_t { return v * kFixedPointScaleValue; };
       fixed_point_rect = gfx::Rect(to_fixed_point(crop_rect.x()),
                                    to_fixed_point(crop_rect.y()),
                                    to_fixed_point(crop_rect.width()),
                                    to_fixed_point(crop_rect.height()));
     }
 
-    // If Overlay completely covers primary and isn't transparent, than use
-    // it as primary. This reduces the no of planes which need to be read in
-    // display controller side.
-    if (primary_plane) {
-      // TODO(dcastagna): Check if we can move this optimization to
-      // GLRenderer::ScheduleOverlays.
-      // Note that Chromium compositor promotes buffers to overlays (ABGR
-      // ones too) only if blending is not needed.
-      // TODO(dcastagna): this should check if the format is the same as
-      // primary_plane->format minus alpha. Changing the format of the primary
-      // plane currently works on rockchip with 3.14 kernel and won't work with
-      // newer kernels. Remove this hack as soon as we can switch the primary
-      // plane format to match overlay buffers formats.
-      if ((fourcc_format == DRM_FORMAT_XBGR8888 ||
-           fourcc_format == DRM_FORMAT_ABGR8888 ||
-           fourcc_format == DRM_FORMAT_XRGB8888 ||
-           fourcc_format == DRM_FORMAT_ARGB8888) &&
-          primary_display_bounds == plane.display_bounds) {
-        ResetCurrentPlaneList(plane_list);
-        hw_plane = primary_plane;
-      }
-    } else {
-      primary_plane = hw_plane;
-      primary_display_bounds = plane.display_bounds;
-    }
-
     if (!SetPlaneData(plane_list, hw_plane, plane, crtc_id, fixed_point_rect,
                       crtc)) {
       ResetCurrentPlaneList(plane_list);
       return false;
     }
 
     plane_list->plane_list.push_back(hw_plane);
     hw_plane->set_owning_crtc(crtc_id);
     hw_plane->set_in_use(true);
   }
@@ skipping 32 matching lines @@
       break;
     } else {
       plane_z_order++;
     }
   }
 
   return format_supported;
 }
 
 }  // namespace ui