[mutter] monitor-manager: Don't use wacky physical dimensions in display name

[Jonas Ådahl <jadahl src gnome org>]

commit cbb2a286f2a7b55a486c4d14be22cf78b94127d0
Author: Dariusz Gadomski <dgadomski gmail com>
Date:   Mon Sep 24 09:48:37 2018 +0200

    monitor-manager: Don't use wacky physical dimensions in display name

 src/backends/meta-monitor-manager-private.h |  2 +
 src/backends/meta-monitor-manager.c         | 59 +++++++++++++++++++++++------
 src/backends/meta-monitor.c                 |  5 +--
 3 files changed, 50 insertions(+), 16 deletions(-)
---
diff --git a/src/backends/meta-monitor-manager-private.h b/src/backends/meta-monitor-manager-private.h
index 760de54c4..3b951c64c 100644
--- a/src/backends/meta-monitor-manager-private.h
+++ b/src/backends/meta-monitor-manager-private.h
@@ -385,4 +385,6 @@ void meta_monitor_manager_clear_output (MetaOutput *output);
 void meta_monitor_manager_clear_mode (MetaCrtcMode *mode);
 void meta_monitor_manager_clear_crtc (MetaCrtc *crtc);
 
+gboolean meta_monitor_has_aspect_as_size (MetaMonitor *monitor);
+
 #endif /* META_MONITOR_MANAGER_PRIVATE_H */
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index 61333b4e5..02cb1619f 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -921,33 +921,62 @@ diagonal_to_str (double d)
   return g_strdup_printf ("%d\"", (int) (d + 0.5));
 }
 
+gboolean
+meta_monitor_has_aspect_as_size (MetaMonitor *monitor)
+{
+  int width_mm;
+  int height_mm;
+
+  meta_monitor_get_physical_dimensions (monitor, &width_mm, &height_mm);
+
+  return (width_mm == 160 && height_mm == 90) ||
+     (width_mm == 160 && height_mm == 100) ||
+     (width_mm == 16 && height_mm == 9) ||
+     (width_mm == 16 && height_mm == 10);
+}
+
 static char *
 make_display_name (MetaMonitorManager *manager,
-                   MetaOutput         *output)
+                   MetaMonitor        *monitor)
 {
   g_autofree char *inches = NULL;
   g_autofree char *vendor_name = NULL;
+  const char *vendor = NULL;
+  const char *product_name = NULL;
+  int width_mm;
+  int height_mm;
 
-  if (meta_output_is_laptop (output))
+  meta_monitor_get_physical_dimensions (monitor, &width_mm, &height_mm);
+
+  if (meta_monitor_is_laptop_panel (monitor))
       return g_strdup (_("Built-in display"));
 
-  if (output->width_mm > 0 && output->height_mm > 0)
+  if (width_mm > 0 && height_mm > 0)
     {
-      double d = sqrt (output->width_mm * output->width_mm +
-                       output->height_mm * output->height_mm);
-      inches = diagonal_to_str (d / 25.4);
+      if (!meta_monitor_has_aspect_as_size (monitor))
+        {
+          double d = sqrt (width_mm * width_mm +
+                           height_mm * height_mm);
+          inches = diagonal_to_str (d / 25.4);
+        }
+      else
+        {
+          product_name = meta_monitor_get_product (monitor);
+        }
     }
 
-  if (g_strcmp0 (output->vendor, "unknown") != 0)
+  vendor = meta_monitor_get_vendor (monitor);
+
+  if (g_strcmp0 (vendor, "unknown") != 0)
     {
       if (!manager->pnp_ids)
         manager->pnp_ids = gnome_pnp_ids_new ();
 
       vendor_name = gnome_pnp_ids_get_pnp_id (manager->pnp_ids,
-                                              output->vendor);
+                                              vendor);
 
       if (!vendor_name)
-        vendor_name = g_strdup (output->vendor);
+        vendor_name = g_strdup (vendor);
     }
   else
     {
@@ -964,6 +993,14 @@ make_display_name (MetaMonitorManager *manager,
        */
       return g_strdup_printf (_("%s %s"), vendor_name, inches);
     }
+  else if (product_name != NULL)
+    {
+      /* Translators: this is a monitor vendor name followed by
+       * product/model name where size in inches could not be calculated,
+       * e.g. Dell U2414H
+       */
+      return g_strdup_printf (_("%s %s"), vendor_name, product_name);
+    }
   else
     {
       return g_strdup (vendor_name);
@@ -1318,7 +1355,6 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
       GVariantBuilder monitor_properties_builder;
       GList *k;
       gboolean is_builtin;
-      MetaOutput *main_output;
       char *display_name;
 
       current_mode = meta_monitor_get_current_mode (monitor);
@@ -1408,8 +1444,7 @@ meta_monitor_manager_handle_get_current_state (MetaDBusDisplayConfig *skeleton,
                              "is-builtin",
                              g_variant_new_boolean (is_builtin));
 
-      main_output = meta_monitor_get_main_output (monitor);
-      display_name = make_display_name (manager, main_output);
+      display_name = make_display_name (manager, monitor);
       g_variant_builder_add (&monitor_properties_builder, "{sv}",
                              "display-name",
                              g_variant_new_take_string (display_name));
diff --git a/src/backends/meta-monitor.c b/src/backends/meta-monitor.c
index 9f32354de..e35da7d70 100644
--- a/src/backends/meta-monitor.c
+++ b/src/backends/meta-monitor.c
@@ -1523,10 +1523,7 @@ calculate_scale (MetaMonitor     *monitor,
    * Somebody encoded the aspect ratio (16/9 or 16/10) instead of the physical
    * size.
    */
-  if ((width_mm == 160 && height_mm == 90) ||
-      (width_mm == 160 && height_mm == 100) ||
-      (width_mm == 16 && height_mm == 9) ||
-      (width_mm == 16 && height_mm == 10))
+  if (meta_monitor_has_aspect_as_size (monitor))
     goto out;
 
   if (width_mm > 0 && height_mm > 0)