From 9fff17787b195e53ff0d9ef97b8579b57fc10c85 Mon Sep 17 00:00:00 2001
From: Jaakko Keränen <jaakko.keranen@iki.fi>
Date: Thu, 17 Feb 2022 14:29:12 +0200
Subject: Fixed mismatched banner and background

There was an issue with loss of color precision. Saturation dropped to zero when converting to 8-bit RGB.
---
 src/ui/color.c | 4 ++--
 src/ui/color.h | 2 ++
 2 files changed, 4 insertions(+), 2 deletions(-)

(limited to 'src/ui')

diff --git a/src/ui/color.c b/src/ui/color.c
index 824342ae..9cba322d 100644
--- a/src/ui/color.c
+++ b/src/ui/color.c
@@ -522,8 +522,8 @@ iHSLColor setLum_HSLColor(iHSLColor d, float lum) {
 }
 
 iHSLColor addSatLum_HSLColor(iHSLColor d, float sat, float lum) {
-    d.sat = iClamp(d.sat + sat, 0, 1);
-    d.lum = iClamp(d.lum + lum, 0, 1);
+    d.sat = iClamp(d.sat + sat, minSat_HSLColor, 1);
+    d.lum = iClamp(d.lum + lum, minSat_HSLColor, 1);
     return d;
 }
 
diff --git a/src/ui/color.h b/src/ui/color.h
index 24f9e713..f46976d7 100644
--- a/src/ui/color.h
+++ b/src/ui/color.h
@@ -231,6 +231,8 @@ struct Impl_HSLColor {
     float hue, sat, lum, a;
 };
 
+#define minSat_HSLColor 0.013f   /* Conversion to 8-bit RGB may result in saturation dropping to zero. */
+
 iHSLColor       hsl_Color       (iColor);
 iColor          rgb_HSLColor    (iHSLColor);
 float           luma_Color      (iColor);
-- 
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