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commit fccf4b18e43adf492ae1397d3c7448f074aef109
Author: Boris Faure <bill...@gmail.com>
AuthorDate: Tue Aug 23 22:33:42 2022 +0200
colorschemes helper: compute pre-multiplied alpha
---
data/colorschemes/ini2desc.py | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/data/colorschemes/ini2desc.py b/data/colorschemes/ini2desc.py
index 798962c..d5a9117 100755
--- a/data/colorschemes/ini2desc.py
+++ b/data/colorschemes/ini2desc.py
@@ -3,6 +3,14 @@
import argparse
import configparser
+def ensure_premultiplied(t):
+ (r, g, b, a) = t
+ if a != 255 and (a > r or a > g or a > b):
+ r = (r * a) // 255
+ g = (g * a) // 255
+ b = (b * a) // 255
+ return (r, g, b, a)
+
def parse_color(color_string):
h = color_string.lstrip('#')
if len(h) == 6:
@@ -10,9 +18,13 @@ def parse_color(color_string):
elif len(h) == 3:
return tuple(int(h[i]+h[i], 16) for i in (0, 1, 2)) + (255,)
elif len(h) == 8:
- return tuple(int(h[i:i+2], 16) for i in (0, 2, 4, 6))
+ t = tuple(int(h[i:i+2], 16) for i in (0, 2, 4, 6))
+ t = ensure_premultiplied(t)
+ return t
elif len(h) == 4:
- return tuple(int(h[i]+h[i], 16) for i in (0, 1, 2, 3))
+ t = tuple(int(h[i]+h[i], 16) for i in (0, 1, 2, 3))
+ t = ensure_premultiplied(t)
+ return t
def write_color(out, color_string):
(r, g, b, a) = parse_color(color_string)
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