[gnome-flashback/wip/randr-1.5: 2/7] display-config: add output tile info retrieval

[Alberts Muktupāvels <muktupavels src gnome org>]

commit cfa319be53a504600c7fca496effc9460c579be3
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Thu Jun 4 02:06:20 2015 +0300

    display-config: add output tile info retrieval
    
    This just adds support for retrieving the tile information from
    X11 (randr 1.5) and stores the tiling information into the output
    struct.
    
    Based on:
    https://git.gnome.org/browse/mutter/commit/?id=6a77d9722a22e638a4e02ff286c546c657967a9d

 .../libdisplay-config/flashback-monitor-manager.c  |   38 ++++++++++++++++++++
 .../libdisplay-config/flashback-monitor-manager.h  |   14 +++++++
 2 files changed, 52 insertions(+), 0 deletions(-)
---
diff --git a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c 
b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
index 6cf127a..3c5ae6c 100644
--- a/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
+++ b/gnome-flashback/libdisplay-config/flashback-monitor-manager.c
@@ -429,6 +429,42 @@ out:
   free (reply);
 }
 
+static void
+output_get_tile_info (FlashbackMonitorManagerPrivate *priv,
+                      MetaOutput                     *output)
+{
+  Atom tile_atom;
+  unsigned char *prop;
+  unsigned long nitems, bytes_after;
+  int actual_format;
+  Atom actual_type;
+
+  if (priv->has_randr15 == FALSE)
+    return;
+
+  tile_atom = XInternAtom (priv->xdisplay, "TILE", FALSE);
+  XRRGetOutputProperty (priv->xdisplay, output->winsys_id,
+                        tile_atom, 0, 100, False,
+                        False, AnyPropertyType,
+                        &actual_type, &actual_format,
+                        &nitems, &bytes_after, &prop);
+
+  if (actual_type == XA_INTEGER && actual_format == 32 && nitems == 8)
+    {
+      long *values = (long *)prop;
+      output->tile_info.group_id = values[0];
+      output->tile_info.flags = values[1];
+      output->tile_info.max_h_tiles = values[2];
+      output->tile_info.max_v_tiles = values[3];
+      output->tile_info.loc_h_tile = values[4];
+      output->tile_info.loc_v_tile = values[5];
+      output->tile_info.tile_w = values[6];
+      output->tile_info.tile_h = values[7];
+    }
+
+  XFree (prop);
+}
+
 static gboolean
 output_get_hotplug_mode_update (FlashbackMonitorManagerPrivate *priv,
                                 MetaOutput                     *output)
@@ -979,6 +1015,8 @@ read_current_config (FlashbackMonitorManager *manager)
           meta_output->suggested_y = output_get_suggested_y (priv, meta_output);
           meta_output->connector_type = output_get_connector_type (priv, meta_output);
 
+          output_get_tile_info (priv, meta_output);
+
           meta_output->n_modes = output->nmode;
           meta_output->modes = g_new0 (MetaMonitorMode *, meta_output->n_modes);
 
diff --git a/gnome-flashback/libdisplay-config/flashback-monitor-manager.h 
b/gnome-flashback/libdisplay-config/flashback-monitor-manager.h
index 0300180..f16f621 100644
--- a/gnome-flashback/libdisplay-config/flashback-monitor-manager.h
+++ b/gnome-flashback/libdisplay-config/flashback-monitor-manager.h
@@ -41,6 +41,7 @@ typedef struct _MetaMonitorMode MetaMonitorMode;
 typedef struct _MetaMonitorInfo MetaMonitorInfo;
 typedef struct _MetaCRTCInfo    MetaCRTCInfo;
 typedef struct _MetaOutputInfo  MetaOutputInfo;
+typedef struct _MetaTileInfo    MetaTileInfo;
 
 typedef enum {
   META_MONITOR_TRANSFORM_NORMAL,
@@ -74,6 +75,17 @@ typedef enum {
   META_CONNECTOR_TYPE_DSI         = 16,
 } MetaConnectorType;
 
+struct _MetaTileInfo {
+  guint32 group_id;
+  guint32 flags;
+  guint32 max_h_tiles;
+  guint32 max_v_tiles;
+  guint32 loc_h_tile;
+  guint32 loc_v_tile;
+  guint32 tile_w;
+  guint32 tile_h;
+};
+
 struct _MetaOutput
 {
   /* The CRTC driving this output, NULL if the output is not enabled */
@@ -121,6 +133,8 @@ struct _MetaOutput
   gboolean            hotplug_mode_update;
   gint                suggested_x;
   gint                suggested_y;
+
+  MetaTileInfo        tile_info;
 };
 
 struct _MetaCRTC