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Use the Windows Family Name for family name matching

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This commit is contained in:
Thomas Goyne 2015-12-15 11:45:32 -08:00
parent e13a39f302
commit 596332763b
1 changed files with 44 additions and 3 deletions
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47
src/font_file_lister_coretext.mm
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@ -51,18 +51,59 @@ FontMatch process_descriptor(NSFontDescriptor *desc, NSString *name) {
}
}
auto get_16 = [](const uint8_t *bytes, ptrdiff_t offset) -> uint16_t {
return (bytes[offset] << 8) + bytes[offset + 1];
};
// Get the weight from the OS/2 table because the weights reported by CT
// are often uncorrelated with the OS/2 weight, which is what GDI uses
auto data = (__bridge_transfer NSData *)CTFontCopyTable((__bridge CTFontRef)font, kCTFontTableOS2, 0);
if (data.length > 7) {
auto bytes = static_cast<const uint8_t *>(data.bytes);
// These values are big-endian in the file, so byteswap them
ret.weight = (bytes[4] << 8) + bytes[5];
ret.width = (bytes[6] << 8) + bytes[7];
ret.weight = get_16(bytes, 4);
ret.width = get_16(bytes, 6);
}
ret.family_match = [font.familyName isEqualToString:name];
ret.codepoints = [desc objectForKey:NSFontCharacterSetAttribute];
// Some fonts have different family names for OS X and Windows, with all of
// the styles in a single family on OS X, but only bold/italic variants in
// the main family with different families for the other variants on Windows.
// For VSFilter compatiblity we want to match based on the Windows name.
if (ret.family_match) {
auto data = (__bridge_transfer NSData *)CTFontCopyTable((__bridge CTFontRef)font, kCTFontTableName, 0);
auto bytes = static_cast<const uint8_t *>(data.bytes);
uint16_t count = get_16(bytes, 2);
auto strings = bytes + get_16(bytes, 4);
for (uint16_t i = 0; i < count; ++i) {
auto name_record = bytes + 6 + i * 12;
auto platform_id = get_16(name_record, 0);
auto encoding_id = get_16(name_record, 2);
auto name_id = get_16(name_record, 6);
auto length = get_16(name_record, 8);
auto offset = get_16(name_record, 10);
if (name_id != 1) // font family
continue;
if (platform_id != 3 || encoding_id != 1) // only look at MS Unicode
continue;
NSString *msFamily = [[NSString alloc] initWithBytesNoCopy:(void *)(strings + offset)
length:length
encoding:NSUTF16BigEndianStringEncoding
freeWhenDone:NO];
auto range = [msFamily rangeOfString:font.familyName];
// If it's not even a prefix then it's probably for a different language
if (range.location != 0)
continue;
ret.family_match = range.length == msFamily.length;
break;
}
}
return ret;
}