Load and apply a vcgt table from an ICC file to the internal display

ui/ozone/platform/drm/gpu/drm_gpu_display_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/drm_gpu_display_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_descriptor_posix.h"
 #include "base/files/file.h"
 #include "base/single_thread_task_runner.h"
+#include "ui/display/types/gamma_ramp_rgb_entry.h"
 #include "ui/display/types/native_display_observer.h"
 #include "ui/events/ozone/device/device_event.h"
 #include "ui/ozone/common/display_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_device.h"
 #include "ui/ozone/platform/drm/gpu/drm_device_manager.h"
 #include "ui/ozone/platform/drm/gpu/drm_display_mode.h"
 #include "ui/ozone/platform/drm/gpu/drm_display_snapshot.h"
 #include "ui/ozone/platform/drm/gpu/drm_util.h"
 #include "ui/ozone/platform/drm/gpu/screen_manager.h"
 #include "ui/ozone/public/ozone_switches.h"
@@ skipping 163 matching lines @@
   const DrmDeviceVector& devices = drm_device_manager_->GetDrmDevices();
   for (const auto& drm : devices) {
     if (!drm->DropMaster()) {
       LOG(ERROR) << "Failed to relinquish control of the display";
       return false;
     }
   }
   return true;
 }
 
+void DrmGpuDisplayManager::SetGammaRamp(
+    int64_t id,
+    const std::vector<GammaRampRGBEntry>& lut) {
+  DrmDisplaySnapshot* display = FindDisplaySnapshot(id);
+  if (!display) {
+    LOG(ERROR) << "There is no display with ID " << id;
+    return;
+  }
+
+  if (!display->drm()->SetGammaRamp(display->crtc(), lut)) {
+    LOG(ERROR) << "Failed to set gamma ramp for display: crtc_id = "
+               << display->crtc() << " size = " << lut.size();
+  }
+}
+
 DrmDisplaySnapshot* DrmGpuDisplayManager::FindDisplaySnapshot(int64_t id) {
   for (size_t i = 0; i < cached_displays_.size(); ++i)
     if (cached_displays_[i]->display_id() == id)
       return cached_displays_[i];
 
   return NULL;
 }
 
 const DrmDisplayMode* DrmGpuDisplayManager::FindDisplayMode(
     const gfx::Size& size,
@@ skipping 153 matching lines @@
 
     if (it == old_displays.end()) {
       screen_manager_->AddDisplayController(new_displays[i]->drm(),
                                             new_displays[i]->crtc(),
                                             new_displays[i]->connector());
     }
   }
 }
 
 }  // namespace ui