mutter/SOURCES/0001-monitor-manager-Consider-external-layout-before-defa.patch

From 4904f1a1e5b881dfd5a051c15acecb3232dc8207 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
Date: Thu, 28 Jan 2016 15:26:33 +0100
Subject: [PATCH] monitor-manager: Consider external layout before default
 linear config

In case of no existing configuration, we use a default layout of
aligning attached displays horizontally. This sidesteps any layout
configuration that is done externally, for instance via xorg.conf,
which is not desirable. Instead, base the initial configuration on
the existing layout if it passes some sanity checks before falling
back to the default linear config.
---
 src/backends/meta-monitor-config-manager.c | 77 ++++++++++++++++++++++
 src/backends/meta-monitor-config-manager.h |  2 +
 src/backends/meta-monitor-manager.c        | 19 ++++++
 3 files changed, 98 insertions(+)

diff --git a/src/backends/meta-monitor-config-manager.c b/src/backends/meta-monitor-config-manager.c
index 9a54ce50f..d64ca1f79 100644
--- a/src/backends/meta-monitor-config-manager.c
+++ b/src/backends/meta-monitor-config-manager.c
@@ -643,6 +643,83 @@ create_preferred_logical_monitor_config (MetaMonitorManager          *monitor_ma
   return logical_monitor_config;
 }
 
+static MetaLogicalMonitorConfig *
+create_logical_monitor_config_from_output (MetaMonitorManager           *monitor_manager,
+                                           MetaMonitor                  *monitor,
+                                           MetaLogicalMonitorConfig     *primary_logical_monitor_config,
+                                           MetaLogicalMonitorLayoutMode  layout_mode)
+{
+    MetaOutput *output;
+    MetaCrtc *crtc;
+
+    output = meta_monitor_get_main_output (monitor);
+    crtc = meta_output_get_assigned_crtc (output);
+    return create_preferred_logical_monitor_config (monitor_manager,
+                                                    monitor,
+                                                    crtc->rect.x,
+                                                    crtc->rect.y,
+                                                    primary_logical_monitor_config,
+                                                    layout_mode);
+}
+
+MetaMonitorsConfig *
+meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_manager)
+{
+  MetaMonitorManager *monitor_manager = config_manager->monitor_manager;
+  GList *logical_monitor_configs;
+  MetaMonitor *primary_monitor;
+  MetaLogicalMonitorLayoutMode layout_mode;
+  MetaLogicalMonitorConfig *primary_logical_monitor_config;
+  GList *monitors;
+  GList *l;
+
+  if (meta_monitor_config_store_get_config_count (config_manager->config_store) > 0)
+    return NULL;
+
+  primary_monitor = find_primary_monitor (monitor_manager);
+  if (!primary_monitor || !meta_monitor_is_active (primary_monitor))
+    return NULL;
+
+  layout_mode = meta_monitor_manager_get_default_layout_mode (monitor_manager);
+
+  primary_logical_monitor_config =
+    create_logical_monitor_config_from_output (monitor_manager,
+                                               primary_monitor,
+                                               NULL,
+                                               layout_mode);
+
+  primary_logical_monitor_config->is_primary = TRUE;
+  logical_monitor_configs = g_list_append (NULL,
+                                           primary_logical_monitor_config);
+
+  monitors = meta_monitor_manager_get_monitors (monitor_manager);
+  for (l = monitors; l; l = l->next)
+    {
+      MetaMonitor *monitor = l->data;
+      MetaLogicalMonitorConfig *logical_monitor_config;
+
+      if (monitor == primary_monitor)
+        continue;
+
+      if (!meta_monitor_is_active (monitor))
+        continue;
+
+      logical_monitor_config =
+        create_logical_monitor_config_from_output (monitor_manager,
+                                                   monitor,
+                                                   primary_logical_monitor_config,
+                                                   layout_mode);
+
+      logical_monitor_configs = g_list_append (logical_monitor_configs,
+                                               logical_monitor_config);
+    }
+
+  return meta_monitors_config_new (monitor_manager,
+                                   logical_monitor_configs,
+                                   layout_mode,
+                                   META_MONITORS_CONFIG_FLAG_NONE);
+}
+
 MetaMonitorsConfig *
 meta_monitor_config_manager_create_linear (MetaMonitorConfigManager *config_manager)
 {
diff --git a/src/backends/meta-monitor-config-manager.h b/src/backends/meta-monitor-config-manager.h
index 3875e04e9..364a2b36b 100644
--- a/src/backends/meta-monitor-config-manager.h
+++ b/src/backends/meta-monitor-config-manager.h
@@ -94,6 +94,8 @@ gboolean meta_monitor_config_manager_assign (MetaMonitorManager *manager,
 META_EXPORT_TEST
 MetaMonitorsConfig * meta_monitor_config_manager_get_stored (MetaMonitorConfigManager *config_manager);
 
+META_EXPORT_TEST
+MetaMonitorsConfig * meta_monitor_config_manager_create_current (MetaMonitorConfigManager *config_manager);
 META_EXPORT_TEST
 MetaMonitorsConfig * meta_monitor_config_manager_create_linear (MetaMonitorConfigManager *config_manager);
 
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 2d898c757..05b27c6be 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -614,6 +614,25 @@ meta_monitor_manager_ensure_configured (MetaMonitorManager *manager)
       g_clear_object (&config);
     }
 
+  config = meta_monitor_config_manager_create_current (manager->config_manager);
+  if (config)
+    {
+      if (!meta_monitor_manager_apply_monitors_config (manager,
+                                                       config,
+                                                       method,
+                                                       &error))
+        {
+          g_clear_object (&config);
+          g_warning ("Failed to use current monitor configuration: %s",
+                     error->message);
+          g_clear_error (&error);
+        }
+      else
+        {
+          goto done;
+        }
+    }
+
   config = meta_monitor_config_manager_create_linear (manager->config_manager);
   if (config)
     {
-- 
2.21.0