PyAPI: Fix memory leak of parameters used for python 'draw_callbacks'

When closing the blender, while the callbacks are removed, the
reference count of the object used as `customdata` is not decremented.

This commit adds two functions that correctly release the
python `draw_callbacks` before releasing all `draw_callbacks`.

Differential Revision: https://developer.blender.org/D10478

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/python/BPY_extern.h b/source/blender/python/BPY_extern.h
index 366d801a888..90f54c50a6d 100644
--- a/source/blender/python/BPY_extern.h
+++ b/source/blender/python/BPY_extern.h
@@ -21,6 +21,7 @@
 #pragma once
 
 struct AnimationEvalContext;
+struct ARegionType;
 struct ChannelDriver; /* DNA_anim_types.h */
 struct ID;            /* DNA_ID.h */
 struct ListBase;      /* DNA_listBase.h */
@@ -33,6 +34,7 @@ struct bConstraintTarget; /* DNA_constraint_types.h*/
 struct bContext;
 struct bContextDataResult;
 struct bPythonConstraint; /* DNA_constraint_types.h */
+struct wmWindowManager;
 
 #include "BLI_utildefines.h"
 
@@ -100,6 +102,10 @@ void BPY_id_release(struct ID *id);
 
 bool BPY_string_is_keyword(const char *str);
 
+/* bpy_rna_callback.c */
+void BPY_callback_screen_free(struct ARegionType *art);
+void BPY_callback_wm_free(struct wmWindowManager *wm);
+
 /* I18n for addons */
 #ifdef WITH_INTERNATIONAL
 const char *BPY_app_translations_py_pgettext(const char *msgctxt, const char *msgid);