As described in last month’s article, our tools engineer developed two Python scripts for assembling and disassembling ‘sfnt’ collections, both of which operate on TrueType-based source fonts to produce a traditional TrueType Collection (TTC) font or to break apart one, but also operate on CFF-based source fonts to produce a new font species known as an OpenType Collection (OTC).
The purpose of this follow up article is to convey the news that these scripts have been tweaked slightly, and have been included in a new version of AFDKO that was released on 2014-02-18 as Build 61250. One of the benefits of the integration with AFDKO is that the tools are now easier to run, as a simple command.
The following is a demonstration:
% otf2otc -t 'cmap'=0 -o LogoLineStd.ttc LogoLineStd-Light.otf LogoLineStd-Medium.otf LogoLineStd-Bold.otf LogoLineStd-Ultra.otf
Input fonts: ['LogoLineStd-Light.otf', 'LogoLineStd-Medium.otf', 'LogoLineStd-Bold.otf', 'LogoLineStd-Ultra.otf']
Output font: LogoLineStd.ttc
Shared tables: ['GSUB', 'cmap', 'maxp', 'post', 'vhea']
Un-shared tables: ['BASE', 'CFF ', 'GPOS', 'OS/2', 'VORG', 'head', 'hhea', 'hmtx', 'name', 'vmtx']
Done
(Note: The version of this script in AFDKO Build 61250 transposes the reporting of the shared and unshared tables, and what is shown above is based on a corrected version that can be downloaded here, then installed into the “Tools/SharedData/FDKScripts/” subdirectory of AFDKO, replacing the version that is included in Build 61250.)
Note how its output makes the table-share-check.pl script that I introduced in the previous article somewhat obsolete, by conveniently reporting the (completely) shared and unshared tables. However, that script is not completely useless, because it still reports (completely) shared and unshared tables based on either otc2otf -r and spot -T output, though I suggest downloading the latest version. Below is a demonstration:
% otc2otf -r LogoLineStd.ttc | table-share-check.pl
Shared Tables: GSUB, cmap, maxp, post, vhea
Unshared Tables: BASE, CFF , GPOS, OS/2, VORG, head, hhea, hmtx, name, vmtx
% spot -T LogoLineStd.ttc | table-share-check.pl
Shared Tables: GSUB, cmap, maxp, post, vhea
Unshared Tables: BASE, CFF , GPOS, OS/2, VORG, head, hhea, hmtx, name, vmtx
The above paragraph brings up the last point for this article, which are two behavior changes in the otc2otf script. First, the script supports a new “-r” command-line option that reports table offsets, checksums, and lengths, and the extent to which they are shared on a per-font instance basis, as exemplified below:
% otc2otf -r LogoLineStd.ttc
Input font: LogoLineStd.ttc
font 0 offset: 28/0x0000001C. LogoLineStd-Light.otf
BASE offset: 0x0000040C, checksum: 0x1BA818DF, length: 0x000000E8
CFF offset: 0x000005D8, checksum: 0x1715F501, length: 0x00007D10
GPOS offset: 0x00020602, checksum: 0x1646F381, length: 0x000009FE
GSUB offset: 0x00022C14, checksum: 0x9B0A9A80, length: 0x00000926
OS/2 offset: 0x0002353A, checksum: 0x7529D1A9, length: 0x00000060
VORG offset: 0x000236BA, checksum: 0x0D0B3CF9, length: 0x00000050
cmap offset: 0x000237FA, checksum: 0xA1E5EC81, length: 0x00000D88
head offset: 0x00024582, checksum: 0xFC3D0459, length: 0x00000036
hhea offset: 0x00024624, checksum: 0x0B4203A3, length: 0x00000024
hmtx offset: 0x00024690, checksum: 0xC1D77DDB, length: 0x0000039C
maxp offset: 0x00025500, checksum: 0x01A15000, length: 0x00000006
name offset: 0x00025506, checksum: 0xE1EDF545, length: 0x00000797
post offset: 0x00027350, checksum: 0xFFB80032, length: 0x00000020
vhea offset: 0x00027370, checksum: 0x09C7136C, length: 0x00000024
vmtx offset: 0x00027394, checksum: 0xC3E2E642, length: 0x00000632
font 1 offset: 280/0x00000118. LogoLineStd-Medium.otf
BASE offset: 0x000004F4, checksum: 0x1B8E18D8, length: 0x000000E4
CFF offset: 0x000082E8, checksum: 0xC61D636F, length: 0x000080F7
GPOS offset: 0x00021000, checksum: 0xF654DD9C, length: 0x000009AE
GSUB offset: 0x00022C14, already seen
OS/2 offset: 0x0002359A, checksum: 0x75F1D5A9, length: 0x00000060
VORG offset: 0x0002370A, checksum: 0x0D0B3D27, length: 0x00000050
cmap offset: 0x000237FA, already seen
head offset: 0x00024582, already seen
hhea offset: 0x00024624, already seen
hmtx offset: 0x00024A2C, checksum: 0xBCAA7581, length: 0x0000039C
maxp offset: 0x00025500, already seen
name offset: 0x00025C9D, checksum: 0xDB4FBB0C, length: 0x0000079E
post offset: 0x00027350, already seen
vhea offset: 0x00027370, already seen
vmtx offset: 0x000279C6, checksum: 0xC2BDD81E, length: 0x00000632
font 2 offset: 532/0x00000214. LogoLineStd-Bold.otf
BASE offset: 0x000004F4, already seen
CFF offset: 0x000103DF, checksum: 0x31BA2CEC, length: 0x000080E4
GPOS offset: 0x000219AE, checksum: 0xC9E3B98B, length: 0x00000922
GSUB offset: 0x00022C14, already seen
OS/2 offset: 0x000235FA, checksum: 0x76B9D7C9, length: 0x00000060
VORG offset: 0x0002375A, checksum: 0x0D0B3D17, length: 0x00000050
cmap offset: 0x000237FA, already seen
head offset: 0x000245B8, checksum: 0xFC43045B, length: 0x00000036
hhea offset: 0x00024648, checksum: 0x0B4703A2, length: 0x00000024
hmtx offset: 0x00024DC8, checksum: 0xAEC76614, length: 0x0000039C
maxp offset: 0x00025500, already seen
name offset: 0x0002643B, checksum: 0x959E0945, length: 0x00000787
post offset: 0x00027350, already seen
vhea offset: 0x00027370, already seen
vmtx offset: 0x00027FF8, checksum: 0xC14AC4BE, length: 0x00000632
font 3 offset: 784/0x00000310. LogoLineStd-Ultra.otf
BASE offset: 0x000004F4, already seen
CFF offset: 0x000184C3, checksum: 0xA164D643, length: 0x0000813F
GPOS offset: 0x000222D0, checksum: 0xD5BEBF8B, length: 0x00000944
GSUB offset: 0x00022C14, already seen
OS/2 offset: 0x0002365A, checksum: 0x7781D8C9, length: 0x00000060
VORG offset: 0x000237AA, checksum: 0x0D0A3D12, length: 0x00000050
cmap offset: 0x000237FA, already seen
head offset: 0x000245EE, checksum: 0xFC3D045B, length: 0x00000036
hhea offset: 0x0002466C, checksum: 0x0B4103A2, length: 0x00000024
hmtx offset: 0x00025164, checksum: 0xAA6F5FBD, length: 0x0000039C
maxp offset: 0x00025500, already seen
name offset: 0x00026BC2, checksum: 0x01BFFDAC, length: 0x0000078E
post offset: 0x00027350, already seen
vhea offset: 0x00027370, already seen
vmtx offset: 0x0002862A, checksum: 0xC039BB2B, length: 0x00000632
Done
Second, this script now reports which fonts are created when breaking apart an ‘sfnt’ collection (the “-w” command-line option as described in the previous article is no longer necessary, and is thus no longer supported):
% otc2otf LogoLineStd.ttc
Input font: LogoLineStd.ttc
Output font: LogoLineStd-Light.otf
Output font: LogoLineStd-Medium.otf
Output font: LogoLineStd-Bold.otf
Output font: LogoLineStd-Ultra.otf
Done
As usual, enjoy!
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