[libchamplain] Warn if image can't be written to the cache and some code cleanup

[Pierre-Luc Beaudoin <plbeaudoin src gnome org>]

commit f5770c1bd1002970ab03eda1b2db574f89f87b6e
Author: Simon Wenner <simon wenner ch>
Date:   Tue Jul 14 17:27:20 2009 +0200

    Warn if image can't be written to the cache and some code cleanup

 champlain/champlain-memphis-map-source.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/champlain/champlain-memphis-map-source.c b/champlain/champlain-memphis-map-source.c
index 615a5ba..5cd8f7b 100644
--- a/champlain/champlain-memphis-map-source.c
+++ b/champlain/champlain-memphis-map-source.c
@@ -185,12 +185,16 @@ fill_tile (ChamplainMapSource *map_source, ChamplainTile *tile)
   /* check for cached version */
   if (in_cache == TRUE)
     {
-      DEBUG ("Tile was cached: %u %u", champlain_tile_get_x (tile), champlain_tile_get_y (tile));
+      DEBUG ("Tile was cached (%u, %u, %u)", champlain_tile_get_x (tile),
+          champlain_tile_get_y (tile),
+          champlain_tile_get_zoom_level (tile));
       champlain_tile_set_state (tile, CHAMPLAIN_STATE_DONE);
     }
   else
     {
-      DEBUG ("Render tile: %u %u", champlain_tile_get_x (tile), champlain_tile_get_y (tile));
+      DEBUG ("Render tile (%u, %u, %u)", champlain_tile_get_x (tile),
+          champlain_tile_get_y (tile),
+          champlain_tile_get_zoom_level (tile));
       champlain_tile_set_state (tile, CHAMPLAIN_STATE_LOADING);
 
       /* So we don't loose a tile if it is in the thread pool queue for a long time */
@@ -305,7 +309,10 @@ memphis_worker_thread (gpointer data, gpointer user_data)
   g_free (path);
 
   /* Write png image for caching */
-  cairo_surface_write_to_png (cst, filename); // TODO error handling: CAIRO_STATUS_SUCCESS
+  if (cairo_surface_write_to_png (cst, filename) != CAIRO_STATUS_SUCCESS)
+    {
+      g_warning ("Unable to write image '%s' to the cache", filename);
+    }
 
   /* Write the tile content and cache entry */
   tdata = g_new (TileData, 1);