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Conversion: Add support for the CSS text-transform property when subsetting embedded fonts

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Kovid Goyal 2024-04-01 19:41:26 +05:30
parent 1365b44d33
commit 1fbec2919f
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1 changed files with 14 additions and 6 deletions
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20
src/calibre/ebooks/oeb/transforms/subset.py
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@ -15,6 +15,8 @@ from calibre.ebooks.oeb.base import css_text, urlnormalize
from calibre.utils.fonts.subset import subset from calibre.utils.fonts.subset import subset
from polyglot.builtins import iteritems from polyglot.builtins import iteritems
font_properties = ('font-family', 'src', 'font-weight', 'font-stretch', 'font-style', 'text-transform')
def get_font_properties(rule, default=None): def get_font_properties(rule, default=None):
''' '''
@ -24,8 +26,7 @@ def get_font_properties(rule, default=None):
''' '''
props = {} props = {}
s = rule.style s = rule.style
for q in ('font-family', 'src', 'font-weight', 'font-stretch', for q in font_properties:
'font-style'):
g = 'uri' if q == 'src' else 'value' g = 'uri' if q == 'src' else 'value'
try: try:
val = s.getProperty(q).propertyValue[0] val = s.getProperty(q).propertyValue[0]
@ -299,13 +300,20 @@ class SubsetFonts:
if matches: if matches:
return matches[0] return matches[0]
def find_chars(self, elem): def find_chars(self, elem, style):
ans = set() ans = set()
transform = lambda x: x # noqa
tt = style.get('text-transform')
if tt:
if tt in ('uppercase', 'capitalize'):
transform = str.upper
elif tt == 'lowercase':
transform = str.lower
if elem.text: if elem.text:
ans |= set(elem.text) ans |= set(transform(elem.text))
for child in elem: for child in elem:
if child.tail: if child.tail:
ans |= set(child.tail) ans |= set(transform(child.tail))
return ans return ans
def find_usage_in(self, elem, inherited_style): def find_usage_in(self, elem, inherited_style):
@ -314,6 +322,6 @@ class SubsetFonts:
self.find_usage_in(child, style) self.find_usage_in(child, style)
font = self.used_font(style) font = self.used_font(style)
if font: if font:
chars = self.find_chars(elem) chars = self.find_chars(elem, style)
if chars: if chars:
font['chars'] |= chars font['chars'] |= chars