CoglObject: Adds cogl_object_{get,set}_user_data

This provides a mechanism for associating private data with any
CoglObject. We expect Clutter will use this to associate weak materials
with normal materials.

cogl/cogl-object.c

@@ -0,0 +1,246 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2007,2008,2009,2010 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Robert Bragg <robert@linux.intel.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <glib.h>
+#include <string.h>
+
+#include "cogl-types.h"
+#include "cogl-object-private.h"
+
+void *
+cogl_object_ref (void *object)
+{
+  CoglObject *obj = object;
+
+  g_return_val_if_fail (object != NULL, NULL);
+
+  obj->ref_count++;
+  return object;
+}
+
+CoglHandle
+cogl_handle_ref (CoglHandle handle)
+{
+  return cogl_object_ref (handle);
+}
+
+void
+cogl_object_unref (void *object)
+{
+  CoglObject *obj = object;
+
+  g_return_if_fail (object != NULL);
+  g_return_if_fail (obj->ref_count > 0);
+
+  if (--obj->ref_count < 1)
+    {
+      void (*free_func)(void *obj);
+
+      if (obj->n_user_data_entries)
+        {
+          int i;
+          int count = MIN (obj->n_user_data_entries,
+                           COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES);
+
+          for (i = 0; i < count; i++)
+            {
+              CoglUserDataEntry *entry = &obj->user_data_entry[i];
+              if (entry->destroy)
+                entry->destroy (entry->user_data);
+            }
+
+          if (obj->user_data_array != NULL)
+            {
+              for (i = 0; i < obj->user_data_array->len; i++)
+                {
+                  CoglUserDataEntry *entry =
+                    &g_array_index (obj->user_data_array,
+                                    CoglUserDataEntry, i);
+
+                  if (entry->destroy)
+                    entry->destroy (entry->user_data);
+                }
+            }
+
+          g_array_free (obj->user_data_array, TRUE);
+        }
+
+      COGL_OBJECT_DEBUG_FREE (obj);
+      free_func = obj->klass->virt_free;
+      free_func (obj);
+    }
+}
+
+void
+cogl_handle_unref (CoglHandle handle)
+{
+  cogl_object_unref (handle);
+}
+
+GType
+cogl_object_get_type (void)
+{
+  static GType our_type = 0;
+
+  /* XXX: We are keeping the "CoglHandle" name for now incase it would
+   * break bindings to change to "CoglObject" */
+  if (G_UNLIKELY (our_type == 0))
+    our_type = g_boxed_type_register_static (g_intern_static_string ("CoglHandle"),
+                                             (GBoxedCopyFunc) cogl_object_ref,
+                                             (GBoxedFreeFunc) cogl_object_unref);
+
+  return our_type;
+}
+
+GType
+cogl_handle_get_type (void)
+{
+  return cogl_object_get_type ();
+}
+
+/* XXX: Unlike for cogl_object_get_user_data this code will return
+ * an empty entry if available and no entry for the given key can be
+ * found. */
+static CoglUserDataEntry *
+_cogl_object_find_entry (CoglObject *object, CoglUserDataKey *key)
+{
+  CoglUserDataEntry *entry = NULL;
+  int count;
+  int i;
+
+  count = MIN (object->n_user_data_entries,
+               COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES);
+
+  for (i = 0; i < count; i++)
+    {
+      CoglUserDataEntry *current = &object->user_data_entry[i];
+      if (current->key == key)
+        return current;
+      if (current->user_data == NULL)
+        entry = current;
+    }
+
+  if (G_UNLIKELY (object->user_data_array != NULL))
+    {
+      for (i = 0; i < object->user_data_array->len; i++)
+        {
+          CoglUserDataEntry *current =
+            &g_array_index (object->user_data_array, CoglUserDataEntry, i);
+
+          if (current->key == key)
+            return current;
+          if (current->user_data == NULL)
+            entry = current;
+        }
+    }
+
+  return entry;
+}
+
+void
+cogl_object_set_user_data (CoglObject *object,
+                           CoglUserDataKey *key,
+                           void *user_data,
+                           CoglUserDataDestroyCallback destroy)
+{
+  CoglUserDataEntry new_entry;
+  CoglUserDataEntry *entry;
+
+  if (user_data)
+    {
+      new_entry.key = key;
+      new_entry.user_data = user_data;
+      new_entry.destroy = destroy;
+    }
+  else
+    memset (&new_entry, 0, sizeof (new_entry));
+
+  entry = _cogl_object_find_entry (object, key);
+  if (entry)
+    {
+      if (G_LIKELY (entry->destroy))
+        entry->destroy (entry->user_data);
+    }
+  else
+    {
+      if (G_LIKELY (object->n_user_data_entries <
+                    COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES))
+        entry = &object->user_data_entry[object->n_user_data_entries++];
+      else
+        {
+          if (G_UNLIKELY (object->user_data_array == NULL))
+            {
+              object->user_data_array =
+                g_array_new (FALSE, FALSE, sizeof (CoglUserDataEntry));
+            }
+
+          g_array_set_size (object->user_data_array,
+                            object->user_data_array->len + 1);
+          entry =
+            &g_array_index (object->user_data_array, CoglUserDataEntry,
+                            object->user_data_array->len - 1);
+
+          object->n_user_data_entries++;
+        }
+    }
+
+  *entry = new_entry;
+}
+
+void *
+cogl_object_get_user_data (CoglObject *object, CoglUserDataKey *key)
+{
+  int count;
+  int i;
+
+  count = MIN (object->n_user_data_entries,
+               COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES);
+
+  for (i = 0; i < count; i++)
+    {
+      CoglUserDataEntry *entry = &object->user_data_entry[i];
+      if (entry->key == key)
+        return entry->user_data;
+    }
+
+  if (object->user_data_array != NULL)
+    {
+      for (i = 0; i < object->user_data_array->len; i++)
+        {
+          CoglUserDataEntry *entry =
+            &g_array_index (object->user_data_array, CoglUserDataEntry, i);
+
+          if (entry->key == key)
+            return entry->user_data;
+        }
+    }
+
+  return NULL;
+}
+