Add GetThemeColorBlendShade3ubv function

Differential Revision: https://developer.blender.org/D2484

Used by part of T49043

1 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/editors/interface/resources.c b/source/blender/editors/interface/resources.c
index 999556025db..38df7620ed6 100644
--- a/source/blender/editors/interface/resources.c
+++ b/source/blender/editors/interface/resources.c
@@ -1491,6 +1491,23 @@ void UI_GetThemeColorShade3ubv(int colorid, int offset, unsigned char col[3])
 	col[2] = b;
 }
 
+void UI_GetThemeColorBlendShade3ubv(int colorid1, int colorid2, float fac, int offset, unsigned char col[3])
+{
+	const unsigned char *cp1, *cp2;
+
+	cp1 = UI_ThemeGetColorPtr(theme_active, theme_spacetype, colorid1);
+	cp2 = UI_ThemeGetColorPtr(theme_active, theme_spacetype, colorid2);
+
+	CLAMP(fac, 0.0f, 1.0f);
+	col[0] = offset + floorf((1.0f - fac) * cp1[0] + fac * cp2[0]);
+	col[1] = offset + floorf((1.0f - fac) * cp1[1] + fac * cp2[1]);
+	col[2] = offset + floorf((1.0f - fac) * cp1[2] + fac * cp2[2]);
+
+	CLAMP(col[0], 0, 255);
+	CLAMP(col[1], 0, 255);
+	CLAMP(col[2], 0, 255);
+}
+
 void UI_GetThemeColorShadeAlpha4fv(int colorid, int coloffset, int alphaoffset, float col[4])
 {
 	int r, g, b, a;