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head - Font Header Table (OpenType 1.5)

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This table gives global information about the font. The bounding box values should be computed using only glyphs that have contours. Glyphs with no contours should be ignored for the purposes of these calculations.

Type Name Description
Fixed Table version number 0x00010000 for version 1.0.
Fixed fontRevision Set by font manufacturer.
ULONG checkSumAdjustment To compute: set it to 0, sum the entire font as ULONG, then store 0xB1B0AFBA - sum.
ULONG magicNumber Set to 0x5F0F3CF5.
USHORT flags Bit 0: Baseline for font at y=0;
Bit 1: Left sidebearing point at x=0;
Bit 2: Instructions may depend on point size;
Bit 3: Force ppem to integer values for all internal scaler math; may use fractional ppem sizes if this bit is clear;
Bit 4: Instructions may alter advance width (the advance widths might not scale linearly);
Bits 5-10: These should be set according to Apple’s specification . However, they are not implemented in OpenType.
Bit 11: Font data is ‘lossless,’ as a result of having been compressed and decompressed with the Agfa MicroType Express engine.
Bit 12: Font converted (produce compatible metrics)
Bit 13: Font optimized for ClearType™. Note, fonts that rely on embedded bitmaps (EBDT) for rendering should not be considered optimized for ClearType, and therefore should keep this bit cleared.
Bit 14: Reserved, set to 0
Bit 15: Reserved, set to 0
USHORT unitsPerEm Valid range is from 16 to 16384. This value should be a power of 2 for fonts that have TrueType outlines.
LONGDATETIME created Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer
LONGDATETIME modified Number of seconds since 12:00 midnight, January 1, 1904. 64-bit integer
SHORT xMin For all glyph bounding boxes.
SHORT yMin For all glyph bounding boxes.
SHORT xMax For all glyph bounding boxes.
SHORT yMax For all glyph bounding boxes.
USHORT macStyle Bit 0: Bold (if set to 1);
Bit 1: Italic (if set to 1)
Bit 2: Underline (if set to 1)
Bit 3: Outline (if set to 1)
Bit 4: Shadow (if set to 1)
Bit 5: Condensed (if set to 1)
Bit 6: Extended (if set to 1)
Bits 7-15: Reserved (set to 0).
USHORT lowestRecPPEM Smallest readable size in pixels.
SHORT 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. 1
SHORT indexToLocFormat 0 for short offsets, 1 for long.
SHORT glyphDataFormat 0 for current format.
1 A neutral character has no inherent directionality; it is not a character with zero (0) width. Spaces and punctuation are examples of neutral characters. Non-neutral characters are those with inherent directionality. For example, Roman letters (left-to-right) and Arabic letters(right-to-left) have directionality. In a "normal" Roman font where spaces and punctuation are present, the font direction hints should be set to two (2).

Note that the 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.

For historical reasons, the fontRevision value contained in this table is not used by Windows to determine the version of a font. Instead, Windows evaluates the version string (id 5) in the 'name' table.