Weight Paint: implement a red shade for bones with locked weights.

Blender supports locking vertex groups to prevent changes to the
weights. However, as mentioned in comments for D3837, it is hard
to use this because there is no interface for locking in 3D View.

This adds a red shade to bones that are associated with a locked
weight group during weight paint mode, as the first step to adding
such interface. The next step is adding a pie menu for lock/unlock.

Differential Revision: https://developer.blender.org/D6533

2 files changed, 3 insertions, 3 deletions

diff --git a/source/blender/makesdna/DNA_armature_types.h b/source/blender/makesdna/DNA_armature_types.h
index 354344328d3..7192b1295aa 100644
--- a/source/blender/makesdna/DNA_armature_types.h
+++ b/source/blender/makesdna/DNA_armature_types.h
@@ -252,7 +252,8 @@ typedef enum eBone_Flag {
   BONE_ADD_PARENT_END_ROLL = (1 << 24),
   /** this bone was transformed by the mirror function */
   BONE_TRANSFORM_MIRROR = (1 << 25),
-
+  /** this bone is associated with a locked vertex group, ONLY USE FOR DRAWING */
+  BONE_DRAW_LOCKED_WEIGHT = (1 << 26),
 } eBone_Flag;
 
 /* bone->inherit_scale_mode */
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index f0a852a7a1a..d81d8db3bd3 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -283,13 +283,12 @@ typedef struct ThemeSpace {
   unsigned char normal[4];
   unsigned char vertex_normal[4];
   unsigned char loop_normal[4];
-  unsigned char bone_solid[4], bone_pose[4], bone_pose_active[4];
+  unsigned char bone_solid[4], bone_pose[4], bone_pose_active[4], bone_locked_weight[4];
   unsigned char strip[4], strip_select[4];
   unsigned char cframe[4];
   unsigned char time_keyframe[4], time_gp_keyframe[4];
   unsigned char freestyle_edge_mark[4], freestyle_face_mark[4];
   unsigned char time_scrub_background[4];
-  char _pad5[4];
 
   unsigned char nurb_uline[4], nurb_vline[4];
   unsigned char act_spline[4], nurb_sel_uline[4], nurb_sel_vline[4], lastsel_point[4];