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Interpet font Descent as a negative number even if specified as positive 

The PDF RM specifies that Descent should be negative. Fonts that claim
to have a positive Descent (not that it would make sense) always seem
to be wrong about this claim.
pull/203/head
James R. Barlow 2018-11-03 22:52:29 -07:00
parent 1ea9446bd6
commit 2ede124142
1 changed files with 9 additions and 0 deletions
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9
pdfminer/pdffont.py
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@ -488,6 +488,13 @@ class PDFFont(object):
self.leading = num_value(descriptor.get('Leading', 0))
self.bbox = list_value(descriptor.get('FontBBox', (0, 0, 0, 0)))
self.hscale = self.vscale = .001
# PDF RM 9.8.1 specifies /Descent should always be a negative number.
# PScript5.dll seems to produce Descent with a positive number, but
# text analysis will be wrong if this is taken as correct. So force
# descent to negative.
if self.descent > 0:
self.descent = -self.descent
return
def __repr__(self):
@ -503,9 +510,11 @@ class PDFFont(object):
return bytearray(bytes) # map(ord, bytes)
def get_ascent(self):
"""Ascent above the baseline, in text space units"""
return self.ascent * self.vscale
def get_descent(self):
"""Descent below the baseline, in text space units; always negative"""
return self.descent * self.vscale
def get_width(self):