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epub converter: add rgba to rgb conversion

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This commit is contained in:
shirshasa
2021-07-02 15:38:20 +03:00
parent bf92fba871
commit 3a7b6ab7ff
1 changed files with 16 additions and 2 deletions
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18
src/util/color_reader.py
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@@ -78,6 +78,14 @@ def str2closest_html_color_name(s: str):
return ''
def rgba2rgb(r, g, b, alpha):
r_background, g_background, b_background = 255, 255, 255
r_new = int((1 - alpha) * r_background + alpha * r)
g_new = int((1 - alpha) * g_background + alpha * g)
b_new = int((1 - alpha) * b_background + alpha * b)
return r_new, g_new, b_new
def str2hex(s: str):
if '#' in s:
return s.lower()
@@ -89,20 +97,26 @@ def str2hex(s: str):
return rgb_percent_to_hex((r, g, b))
if 'rgb' in s:
match = re.search(r'rgba*\(((\d+), *(\d+), *(\d+)(, \d\.\d+)*)\)', s)
match = re.search(r'rgba*\(((\d+), *(\d+), *(\d+), (\d\.\d+)*)\)', s)
if match:
r, g, b = int(match.group(2)), int(match.group(3)), int(match.group(4))
if match.group(5):
alpha = float(match.group(5))
r, g, b = rgba2rgb(r, g, b, alpha)
return rgb_to_hex((r, g, b))
if 'hsl' in s:
# hsl(hue in {0,360}, saturation [0, 100%], lightness [0, 100%])
match = re.search(r'hsla*\(((\d+), *(\d+)%, *(\d+)%(, \d\.\d+)*)\)', s)
match = re.search(r'hsla*\(((\d+), *(\d+)%, *(\d+)%, (\d\.\d+)*)\)', s)
if match:
h, s, l = int(match.group(2)), int(match.group(3)), int(match.group(4))
h /= 360
s /= 10
l /= 100
rgb = tuple(hls_to_rgb(h, s, l))
if match.group(5):
alpha = match.group(5)
rgb = rgba2rgb(*rgb, alpha)
return rgb_to_hex(rgb)
if s.lower() in css3_names_to_hex: