font::ttf::os_2(3)
NAME
Font::TTF::OS_2 - the OS/2 table in a TTF font
DESCRIPTION
The OS/2 table has two versions and forms, one an exten
sion of the other. This module supports both forms and the
switching between them.
INSTANCE VARIABLES
- No other variables than those in table and those in the
standard: - Version
xAvgCharWidth
usWeightClass
usWidthClass
fsType
ySubscriptXSize
ySubScriptYSize
ySubscriptXOffset
ySubscriptYOffset
ySuperscriptXSize
ySuperscriptYSize
ySuperscriptXOffset
ySuperscriptYOffset
yStrikeoutSize
yStrikeoutPosition
sFamilyClass
bFamilyType
bSerifStyle
bWeight
bProportion
bContrast
bStrokeVariation
bArmStyle
bLetterform
bMidline
bXheight
ulUnicodeRange1
ulUnicodeRange2
ulUnicodeRange3
ulUnicodeRange4
achVendID
fsSelection
usFirstCharIndex
usLastCharIndex
sTypoAscender
sTypoDescender
sTypoLineGap
usWinAscent
usWinDescent
ulCodePageRange1
ulCodePageRange2
xHeight
CapHeight
defaultChar
breakChar
maxLookups - Notice that versions 0, 1 & 2 of the table are supported.
Notice also that the Panose variable has been broken down
into its elements.
METHODS
$t->read
Reads in the various values from disk (see details of OS/2
table)
$t->out($fh)
Writes the table to a file either from memory or by copy
ing.
$t->XML_element($context, $depth, $key, $value)
Tidies up the hex values to output them in hex
$t->XML_end($context, $tag, %attrs)
Now handle them on the way back in
$t->update
Updates the OS/2 table by getting information from other
sources:
Updates the "firstChar" and "lastChar" values based on the
MS table in the cmap.
Updates the sTypoAscender, sTypoDescender & sTypoLineGap
to be the same values as Ascender, Descender and Linegap
from the hhea table (assuming it is dirty) and also sets
usWinAscent to be the sum of Ascender+Linegap and usWinDe
scent to be the negative of Descender.
BUGS
None known
AUTHOR
- Martin Hosken Martin_Hosken@sil.org. See Font::TTF::Font
for copyright and licensing.