From 82c6c3f303f7763d20d28682162581b4b6a24f2e Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Wed, 6 May 2020 20:27:14 +0200
Subject: [PATCH] backends: Move device mapping check into backend

Make the upper parts agnostic about the device being relative in
order to apply the display mapping. Just make the low level bits
resort to the identity matrix for those.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1486
---
 src/backends/meta-input-settings.c            | 29 ++++++++-----------
 .../native/meta-input-settings-native.c       | 15 ++++++++--
 2 files changed, 25 insertions(+), 19 deletions(-)

diff --git a/src/backends/meta-input-settings.c b/src/backends/meta-input-settings.c
index 045df81de..0fcac9095 100644
--- a/src/backends/meta-input-settings.c
+++ b/src/backends/meta-input-settings.c
@@ -1082,24 +1082,19 @@ update_device_display (MetaInputSettings  *input_settings,
   priv = meta_input_settings_get_instance_private (input_settings);
   input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
 
-  /* If mapping is relative, the device can move on all displays */
-  if (clutter_input_device_get_device_type (device) == CLUTTER_TOUCHSCREEN_DEVICE ||
-      clutter_input_device_get_mapping_mode (device) ==
-      CLUTTER_INPUT_DEVICE_MAPPING_ABSOLUTE)
+  meta_input_settings_find_monitor (input_settings, settings, device,
+                                    &monitor, &logical_monitor);
+  if (monitor)
     {
-      meta_input_settings_find_monitor (input_settings, settings, device,
-                                        &monitor, &logical_monitor);
-      if (monitor)
-        {
-          meta_input_mapper_remove_device (priv->input_mapper, device);
-          meta_monitor_manager_get_monitor_matrix (priv->monitor_manager,
-                                                   monitor, logical_monitor, matrix);
-        }
-      else
-        {
-          if (meta_input_settings_delegate_on_mapper (input_settings, device))
-            return;
-        }
+      meta_input_mapper_remove_device (priv->input_mapper, device);
+      meta_monitor_manager_get_monitor_matrix (priv->monitor_manager,
+                                               monitor, logical_monitor,
+                                               matrix);
+    }
+  else
+    {
+      if (meta_input_settings_delegate_on_mapper (input_settings, device))
+        return;
     }
 
   input_settings_class->set_matrix (input_settings, device, matrix);
diff --git a/src/backends/native/meta-input-settings-native.c b/src/backends/native/meta-input-settings-native.c
index 6f4ff6ba7..9ad28452d 100644
--- a/src/backends/native/meta-input-settings-native.c
+++ b/src/backends/native/meta-input-settings-native.c
@@ -70,8 +70,19 @@ meta_input_settings_native_set_matrix (MetaInputSettings  *settings,
 {
   cairo_matrix_t dev_matrix;
 
-  cairo_matrix_init (&dev_matrix, matrix[0], matrix[3], matrix[1],
-                     matrix[4], matrix[2], matrix[5]);
+  if (clutter_input_device_get_device_type (device) ==
+      CLUTTER_TOUCHSCREEN_DEVICE ||
+      clutter_input_device_get_mapping_mode (device) ==
+      CLUTTER_INPUT_DEVICE_MAPPING_ABSOLUTE)
+    {
+      cairo_matrix_init (&dev_matrix, matrix[0], matrix[3], matrix[1],
+                         matrix[4], matrix[2], matrix[5]);
+    }
+  else
+    {
+      cairo_matrix_init_identity (&dev_matrix);
+    }
+
   g_object_set (device, "device-matrix", &dev_matrix, NULL);
 }