TtfHeadTable

12 Sep 20251 minute to read

TtfHeadTable.ts class for EJ2-PDF

Properties

checkSumAdjustment number

CheckSumAdjustment: To compute: set it to 0, sum the entire font as U Long,
then store 0x B 1 B 0 A F B A - sum.

created number

Created: International date (8-byte field).

flags number

Bit 0 - baseline for font at y=0
Bit 1 - left SideBearing at x=0
Bit 2 - instructions may depend on point size
Bit 3 - force p p e m to integer values for all private scaler math; may use fractional p p e m sizes if this bit is clean
Bit 4 - instructions may alter advance width (the advance widths might not scale linearly)
Note: All other bits must be zero.

fontDirectionHint number

FontDirectionHint:
0 Fully mixed directional glyphs
1 Only strongly left to right
2 Like 1 but also contains neutrals
-1 Only strongly right to left
-2 Like -1 but also contains neutrals.

fontRevision number

FontRevision: Set by font manufacturer.

glyphDataFormat number

0 for current format.

indexToLocalFormat number

0 for short offsets, 1 for long.

lowestReadableSize number

lowestReadableSize: Smallest readable size in pixels.

macStyle number

Regular: 0
Bold: 1
Italic: 2
Bold Italic: 3
Bit 0 - bold (if set to 1)
Bit 1 - italic (if set to 1)
Bits 2-15 - reserved (set to 0)
NOTE:
Note that macStyle bits must agree with the ‘OS/2’ table fsSelection bits.
The fsSelection bits are used over the macStyle bits in Microsoft Windows.
The PANOSE values and ‘post’ table values are ignored for determining bold or italic fonts.

magicNumber number

MagicNumber: Set to 0x5F0F3CF5.

modified number

Modified: International date (8-byte field).

unitsPerEm number

Valid range is from 16 to 16384.

version number

Table version number: 0x00010000 for version 1.0.

xMax number

Maximum x for all glyph bounding boxes.

xMin number

Minimum x for all glyph bounding boxes.

yMax number

Maximum y for all glyph bounding boxes.

yMin number

Minimum y for all glyph bounding boxes.