HSL color wheel implementation.

This is a standard Hue - Saturation - Lightness model
(see for instance entry on wikipedia here: https://en.wikipedia.org/wiki/HSL_and_HSV)
Note though the difference between HSV and HSL saturation, which are not the same.

The advantage of having this color selection scheme is that artists can select
shades and tints of a color easily by using the lightness slider. Also colors
are arranged on (approximated) perceived lightness on the color wheel.

Beware, Old files opened with this preference saved will crash!

Reviewers: sergey, brecht, campbellbarton

Differential Revision: https://developer.blender.org/D385

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index e0185d82925..9cdd85d8dc0 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -473,6 +473,9 @@ void   ui_popup_menu_memory_set(struct uiBlock *block, struct uiBut *but);
 float *ui_block_hsv_get(struct uiBlock *block);
 void ui_popup_block_scrolltest(struct uiBlock *block);
 
+void ui_rgb_to_color_picker_compat_v(const float rgb[3], float r_cp[3]);
+void ui_color_picker_to_rgb_v(const float r_cp[3], float rgb[3]);
+void ui_color_picker_to_rgb(float r_cp0, float r_cp1, float r_cp2, float *r, float *g, float *b);
 
 /* searchbox for string button */
 ARegion *ui_searchbox_create(struct bContext *C, struct ARegion *butregion, uiBut *but);