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Fix #1996002 [[Bug] ebook edit subset embedded fonts fail](https://bugs.launchpad.net/calibre/+bug/1996002)

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Kovid Goyal 2022-11-09 14:29:43 +05:30
parent d535259677
commit 1211aef0bc
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 13 additions and 7 deletions
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20
src/calibre/utils/fonts/sfnt/cmap.py
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@ -95,7 +95,7 @@ def split_range(start_code, end_code, cmap): # {{{
# }}}
def set_id_delta(id_delta): # {{{
def set_id_delta(index, start_code): # {{{
# The lowest gid in glyphIndexArray, after subtracting id_delta, must be 1.
# id_delta is a short, and must be between -32K and 32K
# startCode can be between 0 and 64K-1, and the first glyph index can be between 1 and 64K-1
@ -109,10 +109,11 @@ def set_id_delta(id_delta): # {{{
# Similarly , we can get from a startCode of 64K-1 to a final GID of 1 by adding 2, because of
# the modulo arithmetic.
id_delta = index - start_code
if id_delta > 0x7FFF:
id_delta = id_delta - 0x10000
elif id_delta < -0x7FFF:
id_delta = id_delta + 0x10000
id_delta -= 0x10000
elif id_delta < -0x7FFF:
id_delta += 0x10000
return id_delta
# }}}
@ -256,9 +257,14 @@ class CmapTable(UnknownTable):
indices = tuple(cmap[char_code] for char_code in range(start_code[i], end_code[i] + 1))
if indices == tuple(range(indices[0], indices[0] + len(indices))):
# indices is a contiguous list
id_delta_temp = set_id_delta(indices[0] - start_code[i])
id_delta.append(id_delta_temp)
id_range_offset.append(0)
id_delta_temp = set_id_delta(indices[0], start_code[i])
if id_delta_temp > 0x7FFF or id_delta_temp < -0x7FFF:
id_delta.append(0)
id_range_offset.append(2 * (len(end_code) + len(glyph_index_array) - i))
glyph_index_array.extend(indices)
else:
id_delta.append(id_delta_temp)
id_range_offset.append(0)
else:
id_delta.append(0)
id_range_offset.append(2 * (len(end_code) + len(glyph_index_array) - i))