Class OpenTypeOffsetTable

The OpenType offset table (the first 12 bytes of every sfnt-based font file). It describes the font's table directory and is used to locate each font table.

Inheritance
object
OpenTypeOffsetTable
Inherited Members
Namespace: DRIT.Drawing.Font.IO
Assembly: DRIT.Drawing.dll
Syntax
public sealed class OpenTypeOffsetTable

Constructors

OpenTypeOffsetTable(uint, ushort, ushort, ushort, ushort)

Initializes a new OpenTypeOffsetTable with the specified values.

Declaration
public OpenTypeOffsetTable(uint sfVersion, ushort numTables, ushort searchRange, ushort entrySelector, ushort rangeShift)
Parameters
Type Name Description
uint sfVersion

The sfnt version.
ushort numTables

Number of tables in this font.
ushort searchRange

Pre-computed binary search value.
ushort entrySelector

Log₂ of the maximum power of 2 ≤ NumTables.
ushort rangeShift

NumTables × 16 − SearchRange.

Fields

SfVersionAppleTrue

0x74727565 — "true" — Apple TrueType.

Declaration
public const uint SfVersionAppleTrue = 1953658213
Field Value
Type Description
uint

SfVersionAppleTyp1

0x74797031 — "typ1" — Legacy Apple Type 1 wrapper (rare).

Declaration
public const uint SfVersionAppleTyp1 = 1954115633
Field Value
Type Description
uint

SfVersionCff

0x4F54544F — "OTTO" — OpenType font with CFF/Type 2 outlines.

Declaration
public const uint SfVersionCff = 1330926671
Field Value
Type Description
uint

SfVersionTrueType

0x00010000 — Standard TrueType / OpenType with TrueType outlines.

Declaration
public const uint SfVersionTrueType = 65536
Field Value
Type Description
uint

Properties

EntrySelector

Log₂ of the maximum power of 2 ≤ NumTables. Pre-computed binary search value; informational only.

Declaration
public ushort EntrySelector { get; }
Property Value
Type Description
ushort

IsCff

True when the sfnt container holds CFF (Type 2 charstring) outlines.

Declaration
public bool IsCff { get; }
Property Value
Type Description
bool

IsTrueType

True when the sfnt container holds TrueType outlines (glyf table).

Declaration
public bool IsTrueType { get; }
Property Value
Type Description
bool

NumTables

Number of tables in this font.

Declaration
public ushort NumTables { get; }
Property Value
Type Description
ushort

RangeShift

NumTables × 16 − SearchRange. Pre-computed binary search value; informational only.

Declaration
public ushort RangeShift { get; }
Property Value
Type Description
ushort

SearchRange

(Maximum power of 2 ≤ NumTables) × 16. Pre-computed binary search value; informational only.

Declaration
public ushort SearchRange { get; }
Property Value
Type Description
ushort

SfVersion

The sfnt version, also called the 'sfVersion' or 'sfntVersion' field. Compare against the SfVersion* constants above.

Declaration
public uint SfVersion { get; }
Property Value
Type Description
uint

Methods

ToString()

Returns a string representation of this offset table.

Declaration
public override string ToString()
Returns
Type Description
string
Overrides