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Optimize fonts

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This commit is contained in:
Guillaume Ayoub 2020-05-29 19:43:56 +02:00
parent 5fea96e5ca
commit 30cc2c1105
1 changed files with 17 additions and 3 deletions
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20
weasyprint/document.py
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@ -16,6 +16,8 @@ from subprocess import run
from urllib.parse import unquote, urlsplit
import pydyf
from fontTools import subset
from fontTools.ttLib import TTFont
from PIL import Image
from weasyprint.layout import LayoutContext
@ -933,9 +935,21 @@ class Document:
# Embeded fonts
resources['Font'] = pydyf.Dictionary()
for font_hash, font in stream._fonts.items():
font_type = 'otf' if font.file_content[:4] == b'OTTO' else 'ttf'
# Optimize font
full_font = io.BytesIO(font.file_content)
optimized_font = io.BytesIO()
ttfont = TTFont(full_font)
options = subset.Options(retain_gids=True)
subsetter = subset.Subsetter(options)
subsetter.populate(gids=font.cmap)
subsetter.subset(ttfont)
ttfont.save(optimized_font)
content = optimized_font.getvalue()
# Include font
font_type = 'otf' if content[:4] == b'OTTO' else 'ttf'
compressobj = zlib.compressobj()
compressed = compressobj.compress(font.file_content)
compressed = compressobj.compress(content)
compressed += compressobj.flush()
font_extra = pydyf.Dictionary({
'Filter': '/FlateDecode',
@ -943,7 +957,7 @@ class Document:
if font_type == 'otf':
font_extra['Subtype'] = '/OpenType'
else:
font_extra['Length1'] = len(font.file_content)
font_extra['Length1'] = len(content)
font_stream = pydyf.Stream([compressed], font_extra)
pdf.add_object(font_stream)