[gnome-flashback] logical-monitor: add helper for iterating over active CRTCs

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d5f13b5eda70340a3501c913913d6d1b69658837
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Wed Jan 24 17:01:19 2018 +0200

    logical-monitor: add helper for iterating over active CRTCs
    
    Based on mutter commit:
    https://gitlab.gnome.org/GNOME/mutter/commit/903537a2a0cb

 backends/gf-logical-monitor-private.h |   10 +++++++
 backends/gf-logical-monitor.c         |   47 +++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 0 deletions(-)
---
diff --git a/backends/gf-logical-monitor-private.h b/backends/gf-logical-monitor-private.h
index e812247..02098a3 100644
--- a/backends/gf-logical-monitor-private.h
+++ b/backends/gf-logical-monitor-private.h
@@ -59,6 +59,11 @@ struct _GfLogicalMonitor
   GList              *monitors;
 };
 
+typedef void (* GfLogicalMonitorCrtcFunc) (GfLogicalMonitor *logical_monitor,
+                                           GfCrtc           *crtc,
+                                           gpointer          user_data);
+
+
 GfLogicalMonitor   *gf_logical_monitor_new           (GfMonitorManager       *monitor_manager,
                                                       GfLogicalMonitorConfig *logical_monitor_config,
                                                       gint                    monitor_number);
@@ -88,6 +93,11 @@ gboolean            gf_logical_monitor_has_neighbor  (GfLogicalMonitor       *mo
                                                       GfLogicalMonitor       *neighbor,
                                                       GfDirection             direction);
 
+void                gf_logical_monitor_foreach_crtc  (GfLogicalMonitor         *logical_monitor,
+                                                      GfLogicalMonitorCrtcFunc  func,
+                                                      gpointer                  user_data);
+
+
 G_END_DECLS
 
 #endif
diff --git a/backends/gf-logical-monitor.c b/backends/gf-logical-monitor.c
index b89dde0..c34d6d4 100644
--- a/backends/gf-logical-monitor.c
+++ b/backends/gf-logical-monitor.c
@@ -32,8 +32,31 @@ typedef struct
   GfLogicalMonitor *logical_monitor;
 } AddMonitorFromConfigData;
 
+typedef struct
+{
+  GfLogicalMonitor         *logical_monitor;
+  GfLogicalMonitorCrtcFunc  func;
+  gpointer                  user_data;
+} ForeachCrtcData;
+
 G_DEFINE_TYPE (GfLogicalMonitor, gf_logical_monitor, G_TYPE_OBJECT)
 
+static gboolean
+foreach_crtc (GfMonitor          *monitor,
+              GfMonitorMode      *mode,
+              GfMonitorCrtcMode  *monitor_crtc_mode,
+              gpointer            user_data,
+              GError            **error)
+{
+  ForeachCrtcData *data = user_data;
+
+  data->func (data->logical_monitor,
+              monitor_crtc_mode->output->crtc,
+              data->user_data);
+
+  return TRUE;
+}
+
 static void
 add_monitor_from_config (GfMonitorConfig          *monitor_config,
                          AddMonitorFromConfigData *data)
@@ -268,3 +291,27 @@ gf_logical_monitor_has_neighbor (GfLogicalMonitor *monitor,
 
   return FALSE;
 }
+
+void
+gf_logical_monitor_foreach_crtc (GfLogicalMonitor         *logical_monitor,
+                                 GfLogicalMonitorCrtcFunc  func,
+                                 gpointer                  user_data)
+{
+  GList *l;
+
+  for (l = logical_monitor->monitors; l; l = l->next)
+    {
+      GfMonitor *monitor;
+      GfMonitorMode *mode;
+      ForeachCrtcData data;
+
+      monitor = l->data;
+      mode = gf_monitor_get_current_mode (monitor);
+
+      data.logical_monitor = logical_monitor;
+      data.func = func;
+      data.user_data = user_data;
+
+      gf_monitor_mode_foreach_crtc (monitor, mode, foreach_crtc, &data, NULL);
+    }
+}