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Temporary solution to read woff2

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ema
2024-12-30 04:21:24 +08:00
parent ffecab95be
commit 4eb4251db5
91 changed files with 34874 additions and 4 deletions
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QuickLook.Plugin/QuickLook.Plugin.FontViewer/Typography.OpenFont/Tables.Others/VerticalMetrics.cs Normal file
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//Apache2, 2017-present, WinterDev
using System;
using System.IO;
namespace Typography.OpenFont.Tables
{
/// <summary>
/// vertical metrics table
/// </summary>
class VerticalMetrics : TableEntry
{
public const string _N = "vmtx";
public override string Name => _N;
// https://docs.microsoft.com/en-us/typography/opentype/spec/vmtx
// vmtx - Vertical Metrics Table
//The vertical metrics table allows you to specify the vertical spacing for each glyph in a vertical font.
//This table consists of either one or two arrays that contain metric information(the advance heights and top sidebearings)
//for the vertical layout of each of the glyphs in the font.
//The vertical metrics coordinate system is shown below.
//Vertical Metrics Table Format
//The overall structure of the vertical metrics table consists of two arrays shown below:
//the vMetrics array followed by an array of top side bearings.
//
//The top side bearing is measured relative to the top of the origin of glyphs,
//for vertical composition of ideographic glyphs.
//
//This table does not have a header,
//but does require that the number of glyphs included in the two arrays equals the total number of glyphs in the font.
//
//The number of entries in the vMetrics array is determined by the value of the numOfLongVerMetrics field of the vertical header table.
//
//The vMetrics array contains two values for each entry.
//These are the advance height and the top sidebearing for each glyph included in the array.
//
//In monospaced fonts, such as Courier or Kanji, all glyphs have the same advance height.
//If the font is monospaced, only one entry need be in the first array, but that one entry is required.
//The format of an entry in the vertical metrics array is given below.
//
//Type Name Description
//uint16 advanceHeight The advance height of the glyph. Unsigned integer in FUnits
//int16 topSideBearing The top sidebearing of the glyph. Signed integer in FUnits.
//The second array is optional and generally is used for a run of monospaced glyphs in the font.
//Only one such run is allowed per font, and it must be located at the end of the font.
//This array contains the top sidebearings of glyphs not represented in the first array,
//and all the glyphs in this array must have the same advance height as the last entry in the vMetrics array.
//All entries in this array are therefore monospaced.
//
//The number of entries in this array is calculated by subtracting the value of numOfLongVerMetrics from the number of glyphs in the font.
//The sum of glyphs represented in the first array plus the glyphs represented in the second array therefore equals the number of glyphs in the font.
//The format of the top sidebearing array is given below.
//Type Name Description
// int16 topSideBearing[] The top sidebearing of the glyph. Signed integer in FUnits.
ushort _numOfLongVerMetrics;
AdvanceHeightAndTopSideBearing[] _advHeightAndTopSideBearings;
public VerticalMetrics(ushort numOfLongVerMetrics)
{
_numOfLongVerMetrics = numOfLongVerMetrics;
}
protected override void ReadContentFrom(BinaryReader reader)
{
_advHeightAndTopSideBearings = new AdvanceHeightAndTopSideBearing[_numOfLongVerMetrics];
int m = 0;
for (int i = _numOfLongVerMetrics - 1; i >= 0; --i)
{
_advHeightAndTopSideBearings[m] = new AdvanceHeightAndTopSideBearing(
reader.ReadUInt16(),
reader.ReadInt16()
);
}
}
public readonly struct AdvanceHeightAndTopSideBearing
{
public readonly ushort advanceHeight;
public readonly short topSideBearing;
public AdvanceHeightAndTopSideBearing(ushort advanceHeight, short topSideBearing)
{
this.advanceHeight = advanceHeight;
this.topSideBearing = topSideBearing;
}
#if DEBUG
public override string ToString()
{
return advanceHeight + "," + topSideBearing;
}
#endif
}
}
}