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Reuse decompressed woff files based on hash

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This commit is contained in:
Colin Kinloch 2021-11-23 16:44:51 +00:00
parent 046f27bf98
commit 6d69d92bbd
1 changed files with 24 additions and 11 deletions
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15
weasyprint/text/fonts.py
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@ -135,6 +135,7 @@ class FontConfiguration:
# Back to default.
self._tempdir = None
self._filenames = []
self._woff_cache = {}
def add_font_face(self, rule_descriptors, url_fetcher):
if self.font_map is None:
@ -194,7 +195,13 @@ class FontConfiguration:
font = result['string']
else:
font = result['file_obj'].read()
if font[:3] == b'wOF':
font_is_woff = font[:3] == b'wOF'
if font_is_woff:
font_hasher = hashlib.sha256()
font_hasher.update(font)
font_digest = font_hasher.hashdigest()
decoded_woff_directory = self._woff_cache.get(font_digest)
if decoded_woff_directory is None:
out = io.BytesIO()
if font[3:4] == b'F':
# woff font
@ -205,6 +212,10 @@ class FontConfiguration:
# woff2 font
woff2.decompress(io.BytesIO(font), out)
font = out.getvalue()
else:
fd = open('rb', decoded_woff_directory)
font = fd.read()
fd.close()
except Exception as exc:
LOGGER.debug(
'Failed to load font at %r (%s)', url, exc)
@ -224,6 +235,8 @@ class FontConfiguration:
fd.write(font)
fd.close()
self._filenames.append(font_filename)
if font_is_woff and font_digest not in self._woff_cache:
self._woff_cache[font_digest] = font_filename
fontconfig_style = FONTCONFIG_STYLE[
rule_descriptors.get('font_style', 'normal')]
fontconfig_weight = FONTCONFIG_WEIGHT[