2 files changed, 28 insertions, 27 deletions

diff --git a/doc/python_api/examples/blf.py b/doc/python_api/examples/blf.py
index f6e87cf488d..e288ac9db66 100644
--- a/doc/python_api/examples/blf.py
+++ b/doc/python_api/examples/blf.py
@@ -2,43 +2,44 @@
 Hello World Text Example
 ++++++++++++++++++++++++
 
-Blender Game Engine example of using the blf module. For this module to work we
+Example of using the blf module. For this module to work we
 need to use the OpenGL wrapper :class:`~bgl` as well.
 """
-# import game engine modules
-from bge import render
-from bge import logic
 # import stand alone modules
 import bgl
 import blf
+import bpy
 
+font_info = {
+    "font_id": 0,
+    "handler": None,
+}
 
 def init():
     """init function - runs once"""
-    # create a new font object, use external ttf file
-    font_path = logic.expandPath('//Zeyada.ttf')
-    # store the font indice - to use later
-    logic.font_id = blf.load(font_path)
+    import os
+    # Create a new font object, use external ttf file.
+    font_path = bpy.path.abspath('//Zeyada.ttf')
+    # Store the font indice - to use later.
+    if os.path.exists(font_path):
+        font_info["font_id"] = blf.load(font_path)
+    else:
+        # Default font.
+        font_info["font_id"] = 0
 
     # set the font drawing routine to run every frame
-    scene = logic.getCurrentScene()
-    scene.post_draw = [write]
+    font_info["handler"] = bpy.types.SpaceView3D.draw_handler_add(
+        draw_callback_px, (None, None), 'WINDOW', 'POST_PIXEL')
 
 
-def write():
-    """write on screen"""
-    width = render.getWindowWidth()
-    height = render.getWindowHeight()
-
-    # OpenGL setup
-    bgl.glMatrixMode(bgl.GL_PROJECTION)
-    bgl.glLoadIdentity()
-    bgl.gluOrtho2D(0, width, 0, height)
-    bgl.glMatrixMode(bgl.GL_MODELVIEW)
-    bgl.glLoadIdentity()
-
+def draw_callback_px(self, context):
+    """Draw on the viewports"""
     # BLF drawing routine
-    font_id = logic.font_id
-    blf.position(font_id, (width * 0.2), (height * 0.3), 0)
+    font_id = font_info["font_id"]
+    blf.position(font_id, 2, 80, 0)
     blf.size(font_id, 50, 72)
     blf.draw(font_id, "Hello World")
+
+
+if __name__ == '__main__':
+    init()
diff --git a/source/blender/python/intern/bpy_rna_callback.c b/source/blender/python/intern/bpy_rna_callback.c
index 68783feacd9..01a25137a98 100644
--- a/source/blender/python/intern/bpy_rna_callback.c
+++ b/source/blender/python/intern/bpy_rna_callback.c
@@ -189,7 +189,7 @@ PyObject *pyrna_callback_classmethod_add(PyObject *UNUSED(self), PyObject *args)
 	StructRNA *srna;
 
 	if (PyTuple_GET_SIZE(args) < 2) {
-		PyErr_SetString(PyExc_ValueError, "handler_add(handle): expected at least 2 args");
+		PyErr_SetString(PyExc_ValueError, "handler_add(handler): expected at least 2 args");
 		return NULL;
 	}
 
@@ -252,7 +252,7 @@ PyObject *pyrna_callback_classmethod_remove(PyObject *UNUSED(self), PyObject *ar
 	int cb_regiontype;
 
 	if (PyTuple_GET_SIZE(args) < 2) {
-		PyErr_SetString(PyExc_ValueError, "callback_remove(handle): expected at least 2 args");
+		PyErr_SetString(PyExc_ValueError, "callback_remove(handler): expected at least 2 args");
 		return NULL;
 	}
 
@@ -263,7 +263,7 @@ PyObject *pyrna_callback_classmethod_remove(PyObject *UNUSED(self), PyObject *ar
 	py_handle = PyTuple_GET_ITEM(args, 1);
 	handle = PyCapsule_GetPointer(py_handle, RNA_CAPSULE_ID);
 	if (handle == NULL) {
-		PyErr_SetString(PyExc_ValueError, "callback_remove(handle): NULL handle given, invalid or already removed");
+		PyErr_SetString(PyExc_ValueError, "callback_remove(handler): NULL handler given, invalid or already removed");
 		return NULL;
 	}