[Bf-blender-cvs] [f7fb1de41b6] master: Fix T72788: Crash Edit Custom Bone Object

[Jeroen Bakker]

Commit: f7fb1de41b68d90d971ea9ef1479a9a9a695fa04
Author: Jeroen Bakker
Date:   Mon Dec 30 13:04:09 2019 +0100
Branches: master
https://developer.blender.org/rBf7fb1de41b68d90d971ea9ef1479a9a9a695fa04

Fix T72788: Crash Edit Custom Bone Object

In a recent refactor we splitted the lines extractor in `extract_lines` and
`extract_lines_loose`. When an object is in edit mode the extracted
lines loose also had to include a dummy bmesh edge iterator. This change
adds this missing dummy method.

Reviewed By: antoniov

Differential Revision: https://developer.blender.org/D6499

===================================================================

M	source/blender/draw/intern/draw_cache_extract_mesh.c

===================================================================

diff --git a/source/blender/draw/intern/draw_cache_extract_mesh.c b/source/blender/draw/intern/draw_cache_extract_mesh.c
index 4bd0aac1ecc..711be9ee776 100644
--- a/source/blender/draw/intern/draw_cache_extract_mesh.c
+++ b/source/blender/draw/intern/draw_cache_extract_mesh.c
@@ -678,6 +678,18 @@ static void extract_lines_loose_ledge_mesh(const MeshRenderData *UNUSED(mr),
    * `ibo.lines`. */
 }
 
+static void extract_lines_loose_ledge_bmesh(const MeshRenderData *UNUSED(mr),
+                                            int UNUSED(e),
+                                            BMEdge *UNUSED(eed),
+                                            void *UNUSED(elb))
+{
+  /* This function is intentionally empty. The existence of this functions ensures that
+   * `iter_type` `MR_ITER_LVERT` is set when initializing the `MeshRenderData` (See
+   * `mesh_extract_iter_type`). This flag ensures that `mr->edge_loose_len` field is filled. This
+   * field we use in the `extract_lines_loose_finish` function to create a subrange from the
+   * `ibo.lines`. */
+}
+
 static void extract_lines_loose_finish(const MeshRenderData *mr,
                                        void *UNUSED(ibo),
                                        void *UNUSED(elb))
@@ -696,7 +708,7 @@ static const MeshExtract extract_lines_loose = {
     NULL,
     NULL,
     NULL,
-    NULL,
+    extract_lines_loose_ledge_bmesh,
     extract_lines_loose_ledge_mesh,
     NULL,
     NULL,