Bounding boxes for CFF glyphs

[Happypig375]

Currently the Bounds property is not assigned and remains zero. I can figure out how to get the horizontal bounds by looking at the GlyphWidth operation, but I cannot find any information about the vertical bounds. Any idea on how this can be done?

[Happypig375]

I wonder if every glyph needs the method from #44. Using that for now. I feel that something better can be done though.
Edit: Nope, that method still requires Glyph.Bounds. Moving on...

[Happypig375]

I don't know about the performance, but this seems to be okay:

using System.Drawing;
class GlyphPathBuilder : Typography.Contours.GlyphPathBuilderBase
{
    public GlyphPathBuilder(Typography.OpenFont.Typeface typeface) : base(typeface)
    {
    }
}
    public RectangleF[] GetBoundingRectsForGlyphs((Typeface Typeface, float PointSize) font, Glyph[] glyphs)
    {
      var rects = new RectangleF[glyphs.Length];
      var b = new GlyphPathBuilder(font.Typeface);
      var tx = new Typography.Contours.GlyphContourBuilder();
      var flattener = new Typography.Contours.GlyphPartFlattener();
      for (int i = 0; i < glyphs.Length; i++) {
        b.BuildFromGlyph(glyphs[i], font.PointSize);
        b.ReadShapes(tx);
        tx.CloseContour();
        float _minX = 0f, _maxX = 0f, _minY = 0f, _maxY = 0f,
               minX = float.MaxValue, maxX = float.MinValue, minY = float.MaxValue, maxY = float.MinValue;
        foreach (var c in tx.GetContours()) {
          c.Flatten(flattener);
          c.FindBounds(ref _minX, ref _minY, ref _maxX, ref _maxY);
          if (_minX < minX) minX = _minX;
          if (_minY < minY) minY = _minY;
          if (_maxX > maxX) maxX = _maxX;
          if (_maxY > maxY) maxY = _maxY;
        }
        rects[i] = RectangleF.FromLTRB(minX, minY, maxX, maxY);
      }
      return rects;
    }

[prepare]

you can calculate once at original size => then scale it later to specific point size.

[Happypig375]

How to calculate at original size then?

[prepare]

How to get Cff Glyph's Bounds

see the example on 4f11b87

please test it.

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[prepare]

@Happypig375 ,

please use branch https://github.com/LayoutFarm/Typography/tree/math_table

There are some MathGlyph Data that are exposed from OpenType's MathTable.