colorschemes helper: compute pre-multiplied alpha

master
Boris Faure 3 months ago
parent 909eac8657
commit fccf4b18e4
Signed by: borisfaure
GPG Key ID: EAA9CD729F522998
  1. 16
      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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