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, 2 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_interface_icons.h b/source/blender/editors/include/UI_interface_icons.h
index bbe66f7fd73..9c0539d5c2f 100644
--- a/source/blender/editors/include/UI_interface_icons.h
+++ b/source/blender/editors/include/UI_interface_icons.h
@@ -32,6 +32,7 @@ struct PointerRNA;
 struct PreviewImage;
 struct Scene;
 struct bContext;
+struct Collection;
 
 enum eIconSizes;
 
@@ -107,6 +108,7 @@ int UI_rnaptr_icon_get(struct bContext *C, struct PointerRNA *ptr, int rnaicon,
 int UI_idcode_icon_get(const int idcode);
 int UI_library_icon_get(const struct ID *id);
 int UI_mode_icon_get(const int mode);
+int UI_collection_color_icon_get(const struct Collection *collection);
 
 #ifdef __cplusplus
 }