Collections: Add color tagging

This adds color tagging to collections. There are 8 color
options which are themable in the user preferences, with an additional
option for no color tag by default.

This adds a new filled collection icon and 8 colored variants of the
icon that can be themed in the user preferences.

In this commit the only interface to setting the color tags is through
Python, and there is nowhere in the interface where the collections are
shown colored. Setting and viewing the color tags from the outliner will
follow.

Manifest Task: https://developer.blender.org/T77777

Differential Revision: https://developer.blender.org/D8622

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index b63f4529559..b60dcb67224 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -453,6 +453,10 @@ typedef enum eWireColor_Flags {
   /* TH_WIRECOLOR_TEXTCOLS = (1 << 1), */ /* UNUSED */
 } eWireColor_Flags;
 
+typedef struct ThemeCollectionColor {
+  unsigned char color[4];
+} ThemeCollectionColor;
+
 /**
  * A theme.
  *
@@ -491,6 +495,9 @@ typedef struct bTheme {
   ThemeWireColor tarm[20];
   /*ThemeWireColor tobj[20];*/
 
+  /* See COLLECTION_COLOR_TOT for the number of collection colors. */
+  ThemeCollectionColor collection_color[8];
+
   int active_theme_area;
   char _pad0[4];
 } bTheme;