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Also use the new font fallback code for embedding fonts in the conversion pipeline

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Kovid Goyal 2016-11-15 12:29:10 +05:30
parent 57476aa5cb
commit 8f6f6fe4a0
1 changed files with 50 additions and 39 deletions
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89
src/calibre/ebooks/oeb/transforms/embed_fonts.py
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@ -19,9 +19,18 @@ from calibre.utils.filenames import ascii_filename
from calibre.utils.fonts.scanner import font_scanner, NoFonts
def used_font(style, embedded_fonts):
ff = [unicode(f) for f in style.get('font-family', []) if unicode(f).lower() not in {
def font_families_from_style(style):
return [unicode(f) for f in style.get('font-family', []) if unicode(f).lower() not in {
'serif', 'sansserif', 'sans-serif', 'fantasy', 'cursive', 'monospace'}]
def font_already_embedded(style, newly_embedded_fonts):
ff = font_families_from_style(style)
return not ff or ff[0] in newly_embedded_fonts
def used_font(style, embedded_fonts):
ff = font_families_from_style(style)
if not ff:
return False, None
lnames = {unicode(x).lower() for x in ff}
@ -85,7 +94,7 @@ class EmbedFonts(object):
self.parser = cssutils.CSSParser(loglevel=logging.CRITICAL, log=logging.getLogger('calibre.css'))
self.warned = set()
self.warned2 = set()
self.warned3 = set()
self.newly_embedded_fonts = set()
for item in oeb.spine:
if not hasattr(item.data, 'xpath'):
@ -171,7 +180,7 @@ class EmbedFonts(object):
for child in elem:
self.find_usage_in(child, style, ff_rules)
has_font, existing = used_font(style, ff_rules)
if not has_font:
if not has_font or font_already_embedded(style, self.newly_embedded_fonts):
return
if existing is None:
in_book = used_font(style, self.embedded_fonts)[1]
@ -194,8 +203,8 @@ class EmbedFonts(object):
page_sheet.data.insertRule(rule, len(page_sheet.data.cssRules))
def embed_font(self, style):
ff = [unicode(f) for f in style.get('font-family', []) if unicode(f).lower() not in {
'serif', 'sansserif', 'sans-serif', 'fantasy', 'cursive', 'monospace'}]
from calibre.ebooks.oeb.polish.embed import find_matching_font, weight_as_number
ff = font_families_from_style(style)
if not ff:
return
ff = ff[0]
@ -204,39 +213,41 @@ class EmbedFonts(object):
try:
fonts = font_scanner.fonts_for_family(ff)
except NoFonts:
self.log.warn('Failed to find fonts for family:', ff, 'not embedding')
self.warned.add(ff)
return
try:
weight = int(style.get('font-weight', '400'))
except (ValueError, TypeError, AttributeError):
w = style['font-weight']
if w not in self.warned2:
self.log.warn('Invalid weight in font style: %r' % w)
self.warned2.add(w)
return
try:
fonts = font_scanner.alt_fonts_for_family(ff)
except NoFonts:
self.log.warn('Failed to find fonts for family:', ff, 'not embedding')
self.warned.add(ff)
return
weight = weight_as_number(style.get('font-weight', '400'))
def do_embed(f):
data = font_scanner.get_font_data(f)
name = f['full_name']
ext = 'otf' if f['is_otf'] else 'ttf'
name = ascii_filename(name).replace(' ', '-').replace('(', '').replace(')', '')
fid, href = self.oeb.manifest.generate(id=u'font', href=u'fonts/%s.%s'%(name, ext))
item = self.oeb.manifest.add(fid, href, guess_type('dummy.'+ext)[0], data=data)
item.unload_data_from_memory()
page_sheet = self.get_page_sheet()
href = page_sheet.relhref(item.href)
css = '''@font-face { font-family: "%s"; font-weight: %s; font-style: %s; font-stretch: %s; src: url(%s) }''' % (
f['font-family'], f['font-weight'], f['font-style'], f['font-stretch'], href)
sheet = self.parser.parseString(css, validate=False)
page_sheet.data.insertRule(sheet.cssRules[0], len(page_sheet.data.cssRules))
self.newly_embedded_fonts.add(ff)
return find_font_face_rules(sheet, self.oeb)[0]
for f in fonts:
if f['weight'] == weight and f['font-style'] == style.get('font-style', 'normal') and f['font-stretch'] == style.get('font-stretch', 'normal'):
self.log('Embedding font %s from %s' % (f['full_name'], f['path']))
data = font_scanner.get_font_data(f)
name = f['full_name']
ext = 'otf' if f['is_otf'] else 'ttf'
name = ascii_filename(name).replace(' ', '-').replace('(', '').replace(')', '')
fid, href = self.oeb.manifest.generate(id=u'font', href=u'fonts/%s.%s'%(name, ext))
item = self.oeb.manifest.add(fid, href, guess_type('dummy.'+ext)[0], data=data)
item.unload_data_from_memory()
page_sheet = self.get_page_sheet()
href = page_sheet.relhref(item.href)
css = '''@font-face { font-family: "%s"; font-weight: %s; font-style: %s; font-stretch: %s; src: url(%s) }''' % (
f['font-family'], f['font-weight'], f['font-style'], f['font-stretch'], href)
sheet = self.parser.parseString(css, validate=False)
page_sheet.data.insertRule(sheet.cssRules[0], len(page_sheet.data.cssRules))
return find_font_face_rules(sheet, self.oeb)[0]
else:
try:
w = int(f['weight'])
except Exception:
w = 200
if w % 100 and ((ff, w) not in self.warned3):
self.warned3.add((ff, w))
self.log.warn('The font %s has a non-standard weight: %s, it will not be embedded' % (ff, w))
return do_embed(f)
try:
f = find_matching_font(fonts, style.get('font-weight', 'normal'), style.get('font-style', 'normal'), style.get('font-stretch', 'normal'))
except Exception:
if ff not in self.warned2:
self.log.exception('Failed to find a matching font for family', ff, 'not embedding')
self.warned2.add(ff)
return
self.log('Embedding font %s from %s' % (f['full_name'], f['path']))
return do_embed(f)