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TtfOS2Table

TtfOS2Table.ts class for EJ2-PDF The OS/2 table consists of a set of metrics that are required by Windows and OS/2.

Properties

fsSelection

number

Information concerning the nature of the font patterns.

fsType

number

Indicates font embedding licensing rights for the font. Embeddable fonts may be stored in a document. When a document with embedded fonts is opened on a system that does not have the font installed (the remote system), the embedded font may be loaded for temporary (and in some cases, permanent) use on that system by an embedding-aware application. Embedding licensing rights are granted by the vendor of the font.

panose

number[]

This 10 byte series of numbers are used to describe the visual characteristics of a given typeface. These characteristics are then used to associate the font with other fonts of similar appearance having different names. The variables for each digit are listed below. The specifications for each variable can be obtained in the specification PANOSE v2.0 Numerical Evaluation from Microsoft Corporation.

sCapHeight

number

Structure field.

sFamilyClass

number

This parameter is a classification of font-family design.

sTypoAscender

number

The typographic ascender for this font. Remember that this is not the same as the Ascender value in the ‘h h e a’ table, which Apple defines in a far different manner. DEFTABLEOFFSET good source for usTypoAscender is the Ascender value from an A F M file.

sTypoDescender

number

The typographic descender for this font. Remember that this is not the same as the Descender value in the ‘h h e a’ table, which Apple defines in a far different manner. DEFTABLEOFFSET good source for usTypoDescender is the Descender value from an A F M file.

sTypoLineGap

number

The typographic line gap for this font. Remember that this is not the same as the LineGap value in the ‘h h e a’ table, which Apple defines in a far different manner.

sxHeight

number

Structure field.

ulCodePageRange1

number

This field is used to specify the code pages encompassed by the font file in the ‘cmap’ subtable for platform 3, encoding ID 1 (Microsoft platform). If the font file is encoding ID 0, then the Symbol Character Set bit should be set. If the bit is set (1) then the code page is considered functional. If the bit is clear (0) then the code page is not considered functional. Each of the bits is treated as an independent flag and the bits can be set in any combination. The determination of “functional” is left up to the font designer, although character set selection should attempt to be functional by code pages if at all possible.

ulCodePageRange2

number

This field is used to specify the code pages encompassed by the font file in the ‘cmap’ subtable for platform 3, encoding ID 1 (Microsoft platform). If the font file is encoding ID 0, then the Symbol Character Set bit should be set. If the bit is set (1) then the code page is considered functional. If the bit is clear (0) then the code page is not considered functional. Each of the bits is treated as an independent flag and the bits can be set in any combination. The determination of “functional” is left up to the font designer, although character set selection should attempt to be functional by code pages if at all possible.

ulUnicodeRange1

number

Structure field.

ulUnicodeRange2

number

Structure field.

ulUnicodeRange3

number

Structure field.

ulUnicodeRange4

number

Structure field.

usBreakChar

number

Structure field.

usDefaultChar

number

Structure field.

usFirstCharIndex

number

The minimum Unicode index (character code) in this font, according to the cmap subtable for platform ID 3 and encoding ID 0 or 1. For most fonts supporting Win-ANSI or other character sets, this value would be 0x0020.

usLastCharIndex

number

usLastCharIndex: The maximum Unicode index (character code) in this font, according to the cmap subtable for platform ID 3 and encoding ID 0 or 1. This value depends on which character sets the font supports.

usMaxContext

number

Structure field.

usWeightClass

number

Indicates the visual weight (degree of blackness or thickness of strokes) of the characters in the font.

usWidthClass

number

Indicates a relative change from the normal aspect ratio (width to height ratio) as specified by a font designer for the glyphs in a font.

usWinAscent

number

The ascender metric for Windows. This too is distinct from Apple’s Ascender value and from the usTypoAscender values. usWinAscent is computed as the yMax for all characters in the Windows ANSI character set. usTypoAscent is used to compute the Windows font height and default line spacing. For platform 3 encoding 0 fonts, it is the same as yMax.

usWinDescent

number

The descender metric for Windows. This too is distinct from Apple’s Descender value and from the usTypoDescender values. usWinDescent is computed as the -yMin for all characters in the Windows ANSI character set. usTypoAscent is used to compute the Windows font height and default line spacing. For platform 3 encoding 0 fonts, it is the same as -yMin.

vendorIdentifier

number[]

The four character identifier for the vendor of the given type face.

version

number

Structure field.

xAvgCharWidth

number

The Average Character Width parameter specifies the arithmetic average of the escapement (width) of all of the 26 lowercase letters a through z of the Latin alphabet and the space character. If any of the 26 lowercase letters are not present, this parameter should equal the weighted average of all glyphs in the font. For non - U G L (platform 3, encoding 0) fonts, use the unweighted average.

yStrikeoutPosition

number

The position of the strikeout stroke relative to the baseline in font design units.

yStrikeoutSize

number

Width of the strikeout stroke in font design units.

ySubscriptXOffset

number

The recommended horizontal offset in font design units for subscripts for this font.

ySubscriptXSize

number

The recommended horizontal size in font design units for subscripts for this font.

ySubscriptYOffset

number

The recommended vertical offset in font design units from the baseline for subscripts for this font.

ySubscriptYSize

number

The recommended vertical size in font design units for subscripts for this font.

ySuperscriptXOffset

number

The recommended horizontal offset in font design units for superscripts for this font.

ySuperscriptXSize

number

The recommended horizontal size in font design units for superscripts for this font.

ySuperscriptYOffset

number

The recommended vertical offset in font design units from the baseline for superscripts for this font.

ySuperscriptYSize

number

The recommended vertical size in font design units for superscripts for this font.