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Temporary solution to read woff2

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ema
2024-12-30 04:21:24 +08:00
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commit 4eb4251db5
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QuickLook.Plugin/QuickLook.Plugin.FontViewer/Typography.OpenFont/AdditionalInfo/Languages.cs Normal file
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//MIT, 2020-present, WinterDev
using System;
using System.Collections.Generic;
using Typography.OpenFont.Tables;
namespace Typography.OpenFont
{
/// <summary>
/// supported langs, designed langs
/// </summary>
public class Languages
{
/// <summary>
/// meta table's supported langs
/// </summary>
public string[] SupportedLangs { get; private set; }
/// <summary>
/// meta table's design langs
/// </summary>
public string[] DesignLangs { get; private set; }
public ushort OS2Version { get; private set; }//for translate unicode ranges
public uint UnicodeRange1 { get; private set; }
public uint UnicodeRange2 { get; private set; }
public uint UnicodeRange3 { get; private set; }
public uint UnicodeRange4 { get; private set; }
/// <summary>
/// actual GSUB script list
/// </summary>
public ScriptList GSUBScriptList { get; private set; }
/// <summary>
/// actual GPOS script list
/// </summary>
public ScriptList GPOSScriptList { get; private set; }
Cmap _cmap;
internal void Update(OS2Table os2Tabble, Meta meta, Cmap cmap, GSUB gsub, GPOS gpos)
{
//https://docs.microsoft.com/en-us/typography/opentype/spec/os2#ur
//This field is used to specify the Unicode blocks or ranges encompassed by the font file in 'cmap' subtables for platform 3,
//encoding ID 1 (Microsoft platform, Unicode BMP) and platform 3,
//encoding ID 10 (Microsoft platform, Unicode full repertoire).
//If a bit is set (1), then the Unicode ranges assigned to that bit are considered functional.
//If the bit is clear (0), then the range is not considered functional.
//unicode BMP (Basic Multilingual Plane),OR plane0 (see https://unicode.org/roadmaps/bmp/)
//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 ranges if at all possible.
//--------------
//Different versions of the OS/2 table were created when different Unicode versions were current,
//and the initial specification for a given version defined fewer bit assignments than for later versions.
//Some applications may not support all assignments for fonts that have earlier OS/2 versions.
//All of the bit assignments listed above are valid for any version of the OS/2 table,
//though OS/2 versions 1 and 2 were specified with some assignments that did not correspond to well-defined Unicode ranges and
//that conflict with later assignments — see the details below.
//If a font has a version 1 or version 2 OS/2 table with one of these bits set,
//the obsolete assignment may be the intended interpretation.
//Because these assignments do not correspond to well-defined ranges,
//however, the implied character coverage is unclear.
//Version 0: When version 0 was first specified, no bit assignments were defined.
//Some applications may ignore these fields in a version 0 OS/2 table.
//Version 1:
//Version 1 was first specified concurrent with Unicode 1.1,
//and bit assigments were defined for bits 0 to 69 only. With fonts that have a version 1 table,
//some applications might recognize only bits 0 to 69.
//Also, version 1 was specified with some bit assignments that did not correspond to a well-defined Unicode range:
// Bit 8: “Greek Symbols and Coptic” (bit 7 was specified as “Basic Greek”)
// Bit 12: “Hebrew Extended” (bit 11 was specified as “Basic Hebrew”)
// Bit 14: “Arabic Extended” (bit 13 was specified as “Basic Arabic”)
// Bit 27: “Georgian Extended” (bit 26 was specified as “Basic Georgian”)
//These assignments were discontinued as of version 2.
//In addition, versions 1 and 2 were defined with bit 53 specified as “CJK Miscellaneous”,
//which also does not correspond to any well-defined Unicode range.
//This assignment was discontinued as of version 3.
//Version 2:
//Version 2 was defined in OpenType 1.1, which was concurrent with Unicode 2.1.
//At that time, bit assignments were defined for bits 0 to 69 only.
//Bit assignments for version 2 were updated in OpenType 1.3,
//adding assignments for bits 70 to 83 corresponding to new blocks assigned in Unicode 2.0 and Unicode 3.0.
//With fonts that have a version 2 table,
//some applications might recognize only those bits assigned in OpenType 1.2 or OpenType 1.3.
//Also, the specification for version 2 continued to use a problematic assignment for bit 53 —
//see details for version 1. This assignment was discontinued as of version 3.
//Version 3: Version 3 was defined in OpenType 1.4 with assignments for bits 84 to 91 corresponding to additional
//ranges in Unicode 3.2.
//In addition, some already-assigned bits were extended to cover additional Unicode ranges for related characters; s
//ee details in the table above.
//Version 4: Version 4 was defined in OpenType 1.5 with assignments for bit 58 and bits 92 to 122 corresponding to additional ranges in Unicode 5.1.
//Also, bits 8, 12, 14, 27 and 53 were re-assigned (see version 1 for previous assignments).
//In addition, some already-assigned bits were extended to cover additional Unicode ranges for related characters;
//see details in the table above.
OS2Version = os2Tabble.version;
UnicodeRange1 = os2Tabble.ulUnicodeRange1;
UnicodeRange2 = os2Tabble.ulUnicodeRange2;
UnicodeRange3 = os2Tabble.ulUnicodeRange3;
UnicodeRange4 = os2Tabble.ulUnicodeRange4;
//ULONG ulUnicodeRange1 Bits 0-31
//ULONG ulUnicodeRange2 Bits 32-63
//ULONG ulUnicodeRange3 Bits 64-95
//ULONG ulUnicodeRange4 Bits 96-127
//-------
//IMPORTANT:***
//All available bits were exhausted as of Unicode 5.1. ***
//The bit assignments were last updated for OS/2 version 4 in OpenType 1.5.
//There are many additional ranges supported in the current version of Unicode that are not supported by these fields in the OS/2 table.
//
//See the 'dlng' and 'slng' tags in the 'meta' table for an alternate mechanism to declare
//what scripts or languages that a font can support or is designed for.
//-------
if (meta != null)
{
SupportedLangs = meta.SupportedLanguageTags;
DesignLangs = meta.DesignLanguageTags;
}
//----
//gsub and gpos contains actual script_list that are in the typeface
GSUBScriptList = gsub?.ScriptList;
GPOSScriptList = gpos?.ScriptList;
_cmap = cmap;
}
/// <summary>
/// contains glyph for the given unicode code point or not
/// </summary>
/// <param name="codepoint"></param>
/// <returns></returns>
public bool ContainGlyphForUnicode(int codepoint) => (_cmap != null) ? (_cmap.GetGlyphIndex(codepoint, 0, out bool skipNextCodePoint) > 0) : false;
}
}