[mutter] clutter/stage-view: Give a stage view a refresh rate

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit bb73038a278c51975af90d910d6a145a9efed496
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Apr 17 09:18:37 2020 +0200

    clutter/stage-view: Give a stage view a refresh rate
    
    Currently unused, but it's intention is to use as a initial refresh rate
    for a with the stage view associated frame clock. It defaults to 60 Hz
    if nothing sets it, but the native backend sets it to the associated
    CRTCs current mode's refresh rate.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1285

 clutter/clutter/clutter-stage-view.c               | 19 +++++++++++++++++++
 src/backends/native/meta-renderer-native.c         |  1 +
 src/backends/x11/nested/meta-renderer-x11-nested.c |  4 ++++
 3 files changed, 24 insertions(+)
---
diff --git a/clutter/clutter/clutter-stage-view.c b/clutter/clutter/clutter-stage-view.c
index eb6bddd67d..d0f46fed67 100644
--- a/clutter/clutter/clutter-stage-view.c
+++ b/clutter/clutter/clutter-stage-view.c
@@ -39,6 +39,7 @@ enum
   PROP_OFFSCREEN,
   PROP_USE_SHADOWFB,
   PROP_SCALE,
+  PROP_REFRESH_RATE,
 
   PROP_LAST
 };
@@ -74,6 +75,8 @@ typedef struct _ClutterStageViewPrivate
   gboolean has_redraw_clip;
   cairo_region_t *redraw_clip;
 
+  float refresh_rate;
+
   guint dirty_viewport   : 1;
   guint dirty_projection : 1;
 } ClutterStageViewPrivate;
@@ -1053,6 +1056,9 @@ clutter_stage_view_get_property (GObject    *object,
     case PROP_SCALE:
       g_value_set_float (value, priv->scale);
       break;
+    case PROP_REFRESH_RATE:
+      g_value_set_float (value, priv->refresh_rate);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -1093,6 +1099,9 @@ clutter_stage_view_set_property (GObject      *object,
     case PROP_SCALE:
       priv->scale = g_value_get_float (value);
       break;
+    case PROP_REFRESH_RATE:
+      priv->refresh_rate = g_value_get_float (value);
+      break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     }
@@ -1147,6 +1156,7 @@ clutter_stage_view_init (ClutterStageView *view)
   priv->dirty_viewport = TRUE;
   priv->dirty_projection = TRUE;
   priv->scale = 1.0;
+  priv->refresh_rate = 60.0;
 }
 
 static void
@@ -1225,5 +1235,14 @@ clutter_stage_view_class_init (ClutterStageViewClass *klass)
                         G_PARAM_CONSTRUCT |
                         G_PARAM_STATIC_STRINGS);
 
+  obj_props[PROP_REFRESH_RATE] =
+    g_param_spec_float ("refresh-rate",
+                        "Refresh rate",
+                        "Update refresh rate",
+                        1.0, G_MAXFLOAT, 60.0,
+                        G_PARAM_READWRITE |
+                        G_PARAM_CONSTRUCT |
+                        G_PARAM_STATIC_STRINGS);
+
   g_object_class_install_properties (object_class, PROP_LAST, obj_props);
 }
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index fad557a23b..9034c800a9 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -3255,6 +3255,7 @@ meta_renderer_native_create_view (MetaRenderer       *renderer,
                        "offscreen", offscreen,
                        "use-shadowfb", use_shadowfb,
                        "transform", view_transform,
+                       "refresh-rate", crtc_mode_info->refresh_rate,
                        NULL);
   g_clear_pointer (&offscreen, cogl_object_unref);
 
diff --git a/src/backends/x11/nested/meta-renderer-x11-nested.c 
b/src/backends/x11/nested/meta-renderer-x11-nested.c
index 92c176ee4d..d6cbe363dc 100644
--- a/src/backends/x11/nested/meta-renderer-x11-nested.c
+++ b/src/backends/x11/nested/meta-renderer-x11-nested.c
@@ -191,6 +191,7 @@ meta_renderer_x11_nested_create_view (MetaRenderer       *renderer,
   CoglOffscreen *fake_onscreen;
   CoglOffscreen *offscreen;
   MetaRectangle view_layout;
+  const MetaCrtcModeInfo *mode_info;
   MetaRendererView *view;
 
   view_transform = calculate_view_transform (monitor_manager, logical_monitor);
@@ -215,11 +216,14 @@ meta_renderer_x11_nested_create_view (MetaRenderer       *renderer,
                                      META_ROUNDING_STRATEGY_ROUND,
                                      &view_layout);
 
+  mode_info = meta_crtc_mode_get_info (crtc_config->mode);
+
   view = g_object_new (META_TYPE_RENDERER_VIEW,
                        "name", meta_output_get_name (output),
                        "stage", meta_backend_get_stage (backend),
                        "layout", &view_layout,
                        "crtc", crtc,
+                       "refresh-rate", mode_info->refresh_rate,
                        "framebuffer", COGL_FRAMEBUFFER (fake_onscreen),
                        "offscreen", COGL_FRAMEBUFFER (offscreen),
                        "transform", view_transform,