private static void ReadGlyph(FontGlyph g, LocaTable locaTable, ByteReader glyfTableReader, float scale)
{
int glyphIndex = g.MapIndex;
int[] glyphOffsets = locaTable.GlyphOffsets;
if (glyphIndex > glyphOffsets.Length)
{
return;
}
int glyphOffset = glyphOffsets[glyphIndex];
int nextOffset = glyphOffsets[glyphIndex + 1];
// No data for glyph.
if (glyphOffset == nextOffset || glyphOffset >= glyfTableReader.Data.Length)
{
return;
}
glyfTableReader.Position = glyphOffset;
int numberOfContours = glyfTableReader.ReadShortBE();
float minX = glyfTableReader.ReadShortBE();
float minY = glyfTableReader.ReadShortBE();
float maxX = glyfTableReader.ReadShortBE();
float maxY = glyfTableReader.ReadShortBE();
g.Min = new Vector2(minX, minY) * scale;
g.Max = new Vector2(maxX, maxY) * scale;
// Simple glyph
if (numberOfContours > 0)
{
// Indices for the last point of each contour
var endPointIndices = new ushort[numberOfContours];
for (var i = 0; i < endPointIndices.Length; i++)
{
endPointIndices[i] = glyfTableReader.ReadUShortBE();
}
ushort instructionLength = glyfTableReader.ReadUShortBE();
glyfTableReader.ReadBytes(instructionLength);
int numberOfCoordinates = endPointIndices[^ 1] + 1;
public static void ParseGlyf(ByteReader reader, LocaTable locaTableParsed, FontGlyph[] glyphs, float scale)
{
// First pass: read commands of all glyphs
for (var i = 0; i < glyphs.Length; i++)
{
FontGlyph glyph = glyphs[i];
ReadGlyph(glyph, locaTableParsed, reader, scale);
}
// Second pass: combine composite glyphs.
for (var i = 0; i < glyphs.Length; i++)
{
FontGlyph glyph = glyphs[i];
if (!glyph.Composite)
{
continue;
}
CombineCompositeGlyph(glyph, glyphs);
}
}