Some of these tables are very short (a total of only 44 bytes on the Mac), so what is the likelihood that they match tables in other fonts that don't require TT hinting?
We need some guarantee that comparing these values will uniquely identify the relevant fonts. David %^> -----Original Message----- From: freetype-devel-bounces+david.bevan=pb....@nongnu.org [mailto:freetype-devel-bounces+david.bevan=pb....@nongnu.org] On Behalf Of mpsuz...@hiroshima-u.ac.jp Sent: 17 November 2010 02:29 To: freetype-devel Subject: [ft-devel] [FYI] MingLiU identifier Hi all, Since freetype-2.4.3, TrueType hinter is enabled for the fonts without family name. It was a fallbacking solution of MingLiU embedded in PDF, without family name (according to Type42 spec, name table is optional, so embedded TrueType in PDF may lack family name). Recently, Gentoo people request to revert it to disable the hinter by default, because it makes TimesNewRoman embedded by Mac OS X Quartz ContextPDF (a generic framework in Mac OS X to generate PDF document) ugly. Thus, now I'm trying to identify problematic fonts which cannot be readable if rendered without hinter, by the checksum (or the pair of checksum & length?) of required table for Type42. cvt, fpgm and prep are the candidates because their content is tightly bound to glyf programs, so they are usually preserved in the TrueType subsetting process. # the proof of idea was posted at: # http://lists.nongnu.org/archive/html/freetype-devel/2010-08/msg00019.html Here I collected the checksums of various versions of MingLiU. During the check, I found that recent MingLiU (post-Vista, and Microsoft Office for Mac) don't cause broken shape issue anymore. I checked various versions mentioned at: http://zh.wikipedia.org/zh/%E6%96%B0%E7%B4%B0%E6%98%8E%E9%AB%94 >From the result, I think, the checksum of cvt/fpgm/prep can be classified into 2 groups, older & newer, I'm happy to see that we (may) don't have to maintain long list of the checksum for all versions of MingLiU. Regards, mpsuzuki Microsoft Windows NT 4.0: ver 2.00 (1996-May-15, second release) tag cvt offset 0x0023dc7c length 0x000002e4 checkSum 0x05bcf058 tag fpgm offset 0x0023df60 length 0x000087c4 checkSum 0x28233bf1 tag prep offset 0x005fb248 length 0x000001e1 checkSum 0xa344a1eb Microsoft OfficeXP Proof Kit: ver 3.00 tag cvt offset 0x0038bb94 length 0x000002e4 checkSum 0x05bcf058 tag fpgm offset 0x0038be78 length 0x000087c4 checkSum 0x28233bf1 tag prep offset 0x0082fe78 length 0x000001e1 checkSum 0xa344a1eb Microsoft Windows XP: ver 3.21 tag cvt offset 0x003a101c length 0x000002e4 checkSum 0x05bcf058 tag fpgm offset 0x003a1300 length 0x000087c4 checkSum 0x28233bf1 tag prep offset 0x0086a004 length 0x000001e1 checkSum 0xa344a1eb (Microsoft Office for Mac v.X: MingLiU is not bundled) Microsoft Office for Mac 2004: ver 4.55 Microsoft Office for Mac 2008: ver 4.55 Microsoft Office for Mac 2011: ver 4.55 tag cvt offset 0x0001cdf8 length 0x00000008 checkSum 0x00000000 tag fpgm offset 0x0001cdd0 length 0x00000011 checkSum 0xf40ddf13 tag prep offset 0x0001cde4 length 0x00000013 checkSum 0x6286ee0a Microsoft Windows Vista: ver 6.02 tag cvt offset 0x004a437c length 0x00000008 checkSum 0x00000000 tag fpgm offset 0x004a4384 length 0x00000011 checkSum 0xf40ddf13 tag prep offset 0x019fc218 length 0x00000013 checkSum 0x6286ee0a Microsoft Windows 7: ver 7.00 tag cvt offset 0x00499f78 length 0x00000008 checkSum 0x00000000 tag fpgm offset 0x00499f80 length 0x00000011 checkSum 0xf40ddf13 tag prep offset 0x019f4064 length 0x00000013 checkSum 0x6286ee0a _______________________________________________ Freetype-devel mailing list Freetype-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/freetype-devel _______________________________________________ Freetype-devel mailing list Freetype-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/freetype-devel
