[clutter/wip/pango-share-atlas: 5/13] cogl-atlas-texture: Add a callback for when any atlas reorganizes

[Neil Roberts <nroberts src gnome org>]

commit eb2b4f132392193aa62385313ffda4a508e2aaa7
Author: Neil Roberts <neil linux intel com>
Date:   Wed Mar 30 12:53:50 2011 +0100

    cogl-atlas-texture: Add a callback for when any atlas reorganizes
    
    This adds cogl_atlas_texture_* functions to register a callback that
    will get invoked whenever any of the CoglAtlas's the textures use get
    reorganized. The callback is global and is not tied to any particular
    atlas texture.

 clutter/cogl/cogl/cogl-atlas-texture-private.h |    8 +++++
 clutter/cogl/cogl/cogl-atlas-texture.c         |   36 ++++++++++++++++++++++++
 clutter/cogl/cogl/cogl-context.c               |    2 +
 clutter/cogl/cogl/cogl-context.h               |    1 +
 4 files changed, 47 insertions(+), 0 deletions(-)
---
diff --git a/clutter/cogl/cogl/cogl-atlas-texture-private.h b/clutter/cogl/cogl/cogl-atlas-texture-private.h
index 49d933c..b7f7b03 100644
--- a/clutter/cogl/cogl/cogl-atlas-texture-private.h
+++ b/clutter/cogl/cogl/cogl-atlas-texture-private.h
@@ -69,4 +69,12 @@ _cogl_atlas_texture_new_with_size (unsigned int     width,
                                    CoglTextureFlags flags,
                                    CoglPixelFormat  internal_format);
 
+void
+_cogl_atlas_texture_add_reorganize_callback (GHookFunc callback,
+                                             void *user_data);
+
+void
+_cogl_atlas_texture_remove_reorganize_callback (GHookFunc callback,
+                                                void *user_data);
+
 #endif /* __COGL_ATLAS_TEXTURE_H */
diff --git a/clutter/cogl/cogl/cogl-atlas-texture.c b/clutter/cogl/cogl/cogl-atlas-texture.c
index 280fb8d..678b309 100644
--- a/clutter/cogl/cogl/cogl-atlas-texture.c
+++ b/clutter/cogl/cogl/cogl-atlas-texture.c
@@ -142,6 +142,8 @@ _cogl_atlas_texture_post_reorganize_cb (void *user_data)
 {
   CoglAtlas *atlas = user_data;
 
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
   if (atlas->map)
     {
       CoglAtlasTextureGetRectanglesData data;
@@ -171,6 +173,9 @@ _cogl_atlas_texture_post_reorganize_cb (void *user_data)
 
       g_free (data.textures);
     }
+
+  /* Notify any listeners that an atlas has changed */
+  g_hook_list_invoke (&ctx->atlas_reorganize_callbacks, FALSE);
 }
 
 static void
@@ -746,6 +751,37 @@ _cogl_atlas_texture_new_from_bitmap (CoglBitmap      *bmp,
   return atlas_tex_handle;
 }
 
+void
+_cogl_atlas_texture_add_reorganize_callback (GHookFunc callback,
+                                             void *user_data)
+{
+  GHook *hook;
+
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
+  hook = g_hook_alloc (&ctx->atlas_reorganize_callbacks);
+  hook->func = callback;
+  hook->data = user_data;
+  g_hook_prepend (&ctx->atlas_reorganize_callbacks, hook);
+}
+
+void
+_cogl_atlas_texture_remove_reorganize_callback (GHookFunc callback,
+                                                void *user_data)
+{
+  GHook *hook;
+
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
+  hook = g_hook_find_func_data (&ctx->atlas_reorganize_callbacks,
+                                FALSE,
+                                callback,
+                                user_data);
+
+  if (hook)
+    g_hook_destroy_link (&ctx->atlas_reorganize_callbacks, hook);
+}
+
 static const CoglTextureVtable
 cogl_atlas_texture_vtable =
   {
diff --git a/clutter/cogl/cogl/cogl-context.c b/clutter/cogl/cogl/cogl-context.c
index 115fc5c..984eb91 100644
--- a/clutter/cogl/cogl/cogl-context.c
+++ b/clutter/cogl/cogl/cogl-context.c
@@ -287,6 +287,7 @@ cogl_create_context (void)
   _cogl_flush_face_winding ();
 
   _context->atlases = NULL;
+  g_hook_list_init (&_context->atlas_reorganize_callbacks, sizeof (GHook));
 
   _context->buffer_map_fallback_array = g_byte_array_new ();
   _context->buffer_map_fallback_in_use = FALSE;
@@ -369,6 +370,7 @@ _cogl_destroy_context (void)
     _cogl_clip_stack_unref (_context->current_clip_stack);
 
   g_slist_free (_context->atlases);
+  g_hook_list_clear (&_context->atlas_reorganize_callbacks);
 
   _cogl_bitmask_destroy (&_context->arrays_enabled);
   _cogl_bitmask_destroy (&_context->temp_bitmask);
diff --git a/clutter/cogl/cogl/cogl-context.h b/clutter/cogl/cogl/cogl-context.h
index eead5dc..5bf157e 100644
--- a/clutter/cogl/cogl/cogl-context.h
+++ b/clutter/cogl/cogl/cogl-context.h
@@ -178,6 +178,7 @@ typedef struct
   CoglPipeline     *blit_texture_pipeline;
 
   GSList           *atlases;
+  GHookList         atlas_reorganize_callbacks;
 
   /* This debugging variable is used to pick a colour for visually
      displaying the quad batches. It needs to be global so that it can