[gegl/gsoc2009-gpu] gegl_tile_lock(): synchronize to/from the GPU data only when GPU support is enabled

[Jerson Michael Perpetua <jperpetua src gnome org>]

commit 7a5c1d1a40e260a174d4b760d0b79653b6e8fbc1
Author: Jerson Michael Perpetua <jersonperpetua gmail com>
Date:   Thu Aug 27 07:40:10 2009 +0800

    gegl_tile_lock(): synchronize to/from the GPU data only when GPU support is enabled

 gegl/buffer/gegl-tile.c |   23 +++++++++++++----------
 1 files changed, 13 insertions(+), 10 deletions(-)
---
diff --git a/gegl/buffer/gegl-tile.c b/gegl/buffer/gegl-tile.c
index ff5408e..0d8536e 100644
--- a/gegl/buffer/gegl-tile.c
+++ b/gegl/buffer/gegl-tile.c
@@ -420,20 +420,23 @@ gegl_tile_lock (GeglTile        *tile,
       /*gegl_buffer_add_dirty (tile->buffer, tile->x, tile->y);*/
     }
 
-  if (lock_mode & GEGL_TILE_LOCK_GPU_READ && tile->rev > tile->gpu_rev)
+  if (gegl_gpu_is_accelerated ())
     {
-      gegl_gpu_texture_set (tile->gpu_data, NULL, tile->data,
-                            gegl_tile_get_format (tile));
+      if (lock_mode & GEGL_TILE_LOCK_GPU_READ && tile->rev > tile->gpu_rev)
+        {
+          gegl_gpu_texture_set (tile->gpu_data, NULL, tile->data,
+                                gegl_tile_get_format (tile));
 
-      tile->gpu_rev = tile->rev;
-    }
+          tile->gpu_rev = tile->rev;
+        }
 
-  if (lock_mode & GEGL_TILE_LOCK_READ && tile->gpu_rev > tile->rev)
-    {
-      gegl_gpu_texture_get (tile->gpu_data, NULL, tile->data,
-                            gegl_tile_get_format (tile));
+      if (lock_mode & GEGL_TILE_LOCK_READ && tile->gpu_rev > tile->rev)
+        {
+          gegl_gpu_texture_get (tile->gpu_data, NULL, tile->data,
+                                gegl_tile_get_format (tile));
 
-      tile->rev = tile->gpu_rev;
+          tile->rev = tile->gpu_rev;
+        }
     }
 
   tile->lock_mode = lock_mode;