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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.AdvancedLayout/CPAL.cs Normal file
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//Apache2, 2017-present Sam Hocevar <sam@hocevar.net>, WinterDev
using System.IO;
namespace Typography.OpenFont.Tables
{
public class CPAL : TableEntry
{
public const string _N = "CPAL";
public override string Name => _N;
//
byte[] _colorBGRABuffer;
// Palette Table Header
// Read the CPAL table
// https://docs.microsoft.com/en-us/typography/opentype/spec/cpal
protected override void ReadContentFrom(BinaryReader reader)
{
long beginAt = reader.BaseStream.Position;
//The CPAL table begins with a header that starts with a version number.
//Currently, only versions 0 and 1 are defined.
//CPAL version 0
//The CPAL header version 0 is organized as follows:
//CPAL version 0
//Type Name Description
//uint16 version Table version number (=0).
//uint16 numPaletteEntries Number of palette entries in each palette.
//uint16 numPalettes Number of palettes in the table.
//uint16 numColorRecords Total number of color records, combined for all palettes.
//Offset32 offsetFirstColorRecord Offset from the beginning of CPAL table to the first ColorRecord.
//uint16 colorRecordIndices[numPalettes] Index of each palette’s first color record in the combined color record array.
//CPAL version 1
//The CPAL header version 1 adds three additional fields to the end of the table header and is organized as follows:
//CPAL version 1
//Type Name Description
//uint16 version Table version number (=1).
//uint16 numPaletteEntries Number of palette entries in each palette.
//uint16 numPalettes Number of palettes in the table.
//uint16 numColorRecords Total number of color records, combined for all palettes.
//Offset32 offsetFirstColorRecord Offset from the beginning of CPAL table to the first ColorRecord.
//uint16 colorRecordIndices[numPalettes] Index of each palette’s first color record in the combined color record array.
//Offset32 offsetPaletteTypeArray Offset from the beginning of CPAL table to the Palette Type Array. Set to 0 if no array is provided.
//Offset32 offsetPaletteLabelArray Offset from the beginning of CPAL table to the Palette Labels Array. Set to 0 if no array is provided.
//Offset32 offsetPaletteEntryLabelArray Offset from the beginning of CPAL table to the Palette Entry Label Array. Set to 0 if no array is provided.
ushort version = reader.ReadUInt16();
ushort numPaletteEntries = reader.ReadUInt16(); // XXX: unused?
ushort numPalettes = reader.ReadUInt16();
ColorCount = reader.ReadUInt16(); //numColorRecords
uint offsetFirstColorRecord = reader.ReadUInt32(); //Offset from the beginning of CPAL table to the first ColorRecord.
Palettes = Utils.ReadUInt16Array(reader, numPalettes); //colorRecordIndices, Index of each palette’s first color record in the combined color record array.
#if DEBUG
if (version == 1)
{
//Offset32 offsetPaletteTypeArray Offset from the beginning of CPAL table to the Palette Type Array. Set to 0 if no array is provided.
//Offset32 offsetPaletteLabelArray Offset from the beginning of CPAL table to the Palette Labels Array. Set to 0 if no array is provided.
//Offset32 offsetPaletteEntryLabelArray Offset from the beginning of CPAL table to the Palette Entry Label Array. Set to 0 if no array is provided.
}
#endif
//move to color records
reader.BaseStream.Seek(beginAt + offsetFirstColorRecord, SeekOrigin.Begin);
_colorBGRABuffer = reader.ReadBytes(4 * ColorCount);
}
public ushort[] Palettes { get; private set; }
public ushort ColorCount { get; private set; }
public void GetColor(int colorIndex, out byte r, out byte g, out byte b, out byte a)
{
//Each color record has BGRA values. The color space for these values is sRGB.
//Type Name Description
//uint8 blue Blue value(B0).
//uint8 green Green value(B1).
//uint8 red Red value(B2).
//uint8 alpha Alpha value(B3).
byte[] colorBGRABuffer = _colorBGRABuffer;
int startAt = colorIndex * 4;//bgra
b = colorBGRABuffer[startAt];
g = colorBGRABuffer[startAt + 1];
r = colorBGRABuffer[startAt + 2];
a = colorBGRABuffer[startAt + 3];
}
}
}