public int Lookup(CodePoint codePoint)
{
int index;
if (table.TryGetValue(codePoint, out index))
{
return(index);
}
return(-1);
}
/// <summary>
/// Gets glyph data for a specific character.
/// </summary>
/// <param name="codePoint">The Unicode codepoint for which to retrieve glyph data.</param>
/// <param name="pixelSize">The desired size of the font, in pixels.</param>
/// <returns>The glyph data if the font supports the given character; otherwise, <c>null</c>.</returns>
public Glyph GetGlyph(CodePoint codePoint, float pixelSize)
{
var glyphIndex = charMap.Lookup(codePoint);
if (glyphIndex < 0)
{
return(null);
}
// set up the control value table
var scale = ComputeScale(pixelSize);
// get metrics
var glyph = glyphs[glyphIndex];
var horizontal = hmetrics[glyphIndex];
var vtemp = vmetrics?[glyphIndex];
if (vtemp == null)
{
var synth = verticalSynthesized;
synth.FrontSideBearing -= glyph.MaxY;
vtemp = synth;
}
var vertical = vtemp.GetValueOrDefault();
// build and transform the glyph
var points = new List <PointF>(32);
var contours = new List <int>(32);
var transform = Matrix3x2.CreateScale(scale, -scale);
//transform.Translation = offset;
Geometry.ComposeGlyphs(glyphIndex, 0, ref transform, points, contours, glyphs);
// add phantom points; these are used to define the extents of the glyph,
// and can be modified by hinting instructions
var pp1 = new Point(glyph.MinX - horizontal.FrontSideBearing, 0);
var pp2 = new Point(pp1.X + horizontal.Advance, 0);
var pp3 = new Point(0, glyph.MaxY + vertical.FrontSideBearing);
var pp4 = new Point(0, pp3.Y - vertical.Advance);
points.Add(pp1 * scale);
points.Add(pp2 * scale);
points.Add(pp3 * scale);
points.Add(pp4 * scale);
// hint the glyph's points
var pointArray = points.ToArray();
var contourArray = contours.ToArray();
return(new Glyph(pointArray, contourArray, horizontal.Advance * scale, vertical.Advance * scale));
}
/// <summary>
/// Gets kerning information for a pair of characters.
/// </summary>
/// <param name="left">The left character.</param>
/// <param name="right">The right character.</param>
/// <param name="pixelSize">The size of the font, in pixels.</param>
/// <returns>The amount of kerning to apply, if any.</returns>
public float GetKerning(CodePoint left, CodePoint right, float pixelSize)
{
if (kernTable == null)
{
return(0.0f);
}
var leftIndex = charMap.Lookup(left);
var rightIndex = charMap.Lookup(right);
if (leftIndex < 0 || rightIndex < 0)
{
return(0.0f);
}
var kern = kernTable.Lookup(leftIndex, rightIndex);
return(kern * ComputeScale(pixelSize));
}
