public static GlyphString Concat(GlyphString g1, GlyphString g2)
{
if (g1 == null)
{
return(g2);
}
if (g2 == null)
{
return(g1);
}
int concatLen = g1.Length + g2.Length;
GlyphChar[] arr = new GlyphChar[concatLen];
Array.Copy(g1.Glyphs, arr, g1.Length);
// Attention: Very confusing parameter order in the
// many overloads for the System.Array functions
// here we use: SourceArray, SourceIndex, DestArray, DestIndex, DestLength (hopefully)
Array.Copy(g2.Glyphs, 0, arr, g1.Length, g2.Length);
GlyphString result = new GlyphString(arr);
result.Length = concatLen;
result.Width = g1.Width + g2.Width;
return(result);
}
public static GlyphString SubString(GlyphString g, int start, int length)
{
if (g == null)
{
return(null);
}
length = Math.Min(length, g.Length - (length - start + 1));
if (length <= 0)
{
return(new GlyphString());
}
GlyphChar[] arr = new GlyphChar[length];
Array.Copy(g.Glyphs, arr, length);
GlyphString result = new GlyphString(arr);
result.Length = length;
result.Width = arr.Sum(p => p.Width);
return(result);
}