add utility function to BLI_math_color - rgb_to_luma, rgb_to_luma_byte, also use rgb_to_grayscale in more places.

1 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/blenlib/BLI_math_color.h b/source/blender/blenlib/BLI_math_color.h
index 2d8b0188165..6d37aabd6ab 100644
--- a/source/blender/blenlib/BLI_math_color.h
+++ b/source/blender/blenlib/BLI_math_color.h
@@ -69,8 +69,10 @@ void rgb_to_hsv_compat(float r, float g, float b, float *lh, float *ls, float *l
 unsigned int rgb_to_cpack(float r, float g, float b);
 unsigned int hsv_to_cpack(float h, float s, float v);
 
-float rgb_to_grayscale(float rgb[3]);
-unsigned char rgb_to_grayscale_byte(unsigned char rgb[3]);
+float rgb_to_grayscale(const float rgb[3]);
+unsigned char rgb_to_grayscale_byte(const unsigned char rgb[3]);
+float rgb_to_luma(const float rgb[3]);
+unsigned char rgb_to_luma_byte(const unsigned char rgb[3]);
 
 /**************** Profile Transformations *****************/