1Font::TTF::OS_2(3)    User Contributed Perl Documentation   Font::TTF::OS_2(3)
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NAME

6       Font::TTF::OS_2 - the OS/2 table in a TTF font
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DESCRIPTION

9       The OS/2 table has two versions and forms, one an extension of the
10       other. This module supports both forms and the switching between them.
11

INSTANCE VARIABLES

13       No other variables than those in table and those in the standard:
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15           Version
16           xAvgCharWidth
17           usWeightClass
18           usWidthClass
19           fsType
20           ySubscriptXSize
21           ySubScriptYSize
22           ySubscriptXOffset
23           ySubscriptYOffset
24           ySuperscriptXSize
25           ySuperscriptYSize
26           ySuperscriptXOffset
27           ySuperscriptYOffset
28           yStrikeoutSize
29           yStrikeoutPosition
30           sFamilyClass
31           bFamilyType
32           bSerifStyle
33           bWeight
34           bProportion
35           bContrast
36           bStrokeVariation
37           bArmStyle
38           bLetterform
39           bMidline
40           bXheight
41           ulUnicodeRange1
42           ulUnicodeRange2
43           ulUnicodeRange3
44           ulUnicodeRange4
45           achVendID
46           fsSelection
47           usFirstCharIndex
48           usLastCharIndex
49           sTypoAscender
50           sTypoDescender
51           sTypoLineGap
52           usWinAscent
53           usWinDescent
54           ulCodePageRange1
55           ulCodePageRange2
56           xHeight
57           CapHeight
58           defaultChar
59           breakChar
60           maxLookups
61
62       Notice that versions 0, 1, 2 & 3 of the table are supported. Notice
63       also that the Panose variable has been broken down into its elements.
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METHODS

66   $t->read
67       Reads in the various values from disk (see details of OS/2 table)
68
69   $t->out($fh)
70       Writes the table to a file either from memory or by copying.
71
72   $t->XML_element($context, $depth, $key, $value)
73       Tidies up the hex values to output them in hex
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75   $t->XML_end($context, $tag, %attrs)
76       Now handle them on the way back in
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78   $t->minsize()
79       Returns the minimum size this table can be. If it is smaller than this,
80       then the table must be bad and should be deleted or whatever.
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82   $t->update
83       Updates the OS/2 table by getting information from other sources:
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85       Updates the "firstChar" and "lastChar" values based on the MS table in
86       the cmap.
87
88       Updates the sTypoAscender, sTypoDescender & sTypoLineGap to be the same
89       values as Ascender, Descender and Linegap from the hhea table (assuming
90       it is dirty) and also sets usWinAscent to be the sum of
91       Ascender+Linegap and usWinDescent to be the negative of Descender.
92
93   $t->guessRangeBits (\%map, [$cp_threshold, [%u_threshold]])
94       Set the ulCodePageRange and ulUnicodeRange fields based on characters
95       actually present in the font.
96
97       %map is a hash keyed by USV returning non-zero for characters present
98       (e.g. use {'val'} a from Unicode cmap).
99
100       The two optional parameters are percentage of characters within the
101       codepage or unicode range that need to be present to constitute
102       coverage. A threshold of 0 causes corresponding range bits to be set if
103       any characters are present at all, while a negative value causes the
104       corresponding range bits to be unchanged. Defaults are 50 and 0,
105       respectively.
106
107       For codepage bits, the threshold is percentage of characters between
108       0xC0 and 0xFF that need to be present to constitute coverage). For
109       codepages other than 1252, characters (e.g., punctuation) that are
110       defined identically to cp1252 are ignored for the purposes of this
111       percentage calculation. Looks only for SBCS codepages, not DBCS.
112
113       For Unicode range bits that represent multiple ranges, e.g., bit 29
114       represents:
115
116         Latin Extended Additional  1E00-1EFF
117         Latin Extended-C           2C60-2C7F
118         Latin Extended-D           A720-A7FF
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120       the bit will be set if any of these ranges meet the threshold
121       requirement.
122

BUGS

124       None known
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AUTHOR

127       Martin Hosken <http://scripts.sil.org/FontUtils>.
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LICENSING

130       Copyright (c) 1998-2016, SIL International (http://www.sil.org)
131
132       This module is released under the terms of the Artistic License 2.0.
133       For details, see the full text of the license in the file LICENSE.
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137perl v5.32.1                      2021-01-27                Font::TTF::OS_2(3)
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