Make GlyphInfo and GlyphPosition structs

[corliss]

Make GlyphInfo and GlyphPosition structs

[corliss]

This turned out to be easy - just declare both types as struct and change the marshaling code to:

		public GlyphInfo[] GlyphInfo()
		{
			int length;
			IntPtr glyphInfoPtr = HB.hb_buffer_get_glyph_infos(reference, out length);
			var glyphInfos = new GlyphInfo[length];
			for (int i = 0; i < length; ++i)
			{
				glyphInfos[i] = Marshal.PtrToStructure<GlyphInfo>(glyphInfoPtr + 20 * i);
			}

			return glyphInfos;
		}
		public GlyphPosition[] GlyphPositions()
		{
			int length;
			IntPtr glyphPositionPtr = HB.hb_buffer_get_glyph_positions(reference, out length);
			var glyphPositions = new GlyphPosition[length];
			for (int i = 0; i < length; ++i)
			{
				glyphPositions[i] = Marshal.PtrToStructure<GlyphPosition>(glyphPositionPtr + 20 * i);
			}

			return glyphPositions;
		}

Note: It would be even better to directly marshal the result of HB.hb_buffer_get_glyph_infos() and HB.hb_buffer_get_glyph_positions() into c# arrays, thereby avoiding the loop. Haven't figured out how to do that, but seems like a common enough situation so it should be possible. But at least this fixes the issue of allocating lots of tiny classes.

[Robmaister]

Yes! Good catch! Arrays like this should be possible, my P/Invoke knowledge is a bit rusty but I'll see if I can make it work