internal void SetCodepoint(UnicodeCharacter codepoint)
{
if (HasCodepoint)
{
throw new InvalidOperationException("Unable to set glyph's codpoint, already set");
}
else
{
Character = codepoint;
HasCodepoint = true;
}
}
/// <summary>
/// Gets the spacing adjustment (ie, kerning) between any two characters.
/// </summary>
public float GetKerning(UnicodeCharacter cp1, UnicodeCharacter cp2, float size)
{
// Compute scaling factor
var scale = ComputeScale(size);
// Get the pair of glyphs
var g1 = GetGlyph(cp1);
var g2 = GetGlyph(cp2);
// Get kerning advance between this glyph an another
return(stbtt_GetGlyphKernAdvance(Info, g1.Index, g2.Index) * scale);
}
/// <summary>
/// Gets the information about a particular glyph in this font.
/// </summary>
/// <param name="ch">Some character.</param>
public Glyph GetGlyph(UnicodeCharacter ch)
{
// Attempt to lookup glyph from dictionary
if (!_glyphLookup.TryGetValue(ch, out var glyph))
{
// Get the index for the specified codepoint
var index = stbtt_FindGlyphIndex(Info, (int)ch);
// Gets the glyph by its index
glyph = GetGlyphByIndex(index);
// Glyph doesn't know its codepoint, so we will set it here since we know now.
// This is because stb doesn't have a way for mapping index -> codpoint (yet?)
if (!glyph.HasCodepoint)
{
glyph.SetCodepoint(ch);
}
// Store glyph by codepoint
_glyphLookup[ch] = glyph;
}
// Return the glyph data for the specified codepoint
return(glyph);
Glyph GetGlyphByIndex(int index)
{
// Glyph is not yet known
if (_glyphs[index] == null)
{
// Create glyph (codepoint is unknown)
_glyphs[index] = new Glyph(this, index);
}
return(_glyphs[index]);
}
}
