On Jul 15, 2008, at 10:54 AM, Chip Bradford wrote:
What seems to be happening is the [NSString drawAtPoint:withAttributes:] method is happily performing font substitution to render the missing glyphs, and [NSLayoutManager glyphAtIndex:] method is giving me the glyphID in that fallback font as well. However, I have no way of knowing when I'm getting back glyphIDs from my chosen font and when I'm getting glyphIDs from the fallback font (nor do I know what that fallback font is) so I can't figure out how I would go about looking up the correct bounding boxes. (I end up looking up the bounding-box for the glyphID in the wrong font).
You can get the substituted font easily--just ask the text storage for the value of the font attribute for the corresponding character. However, you might be better off asking the layout manager for geometry information rather than asking the font for the bounding box. In general, of course, you can't assume a one-to-one correspondence between characters and glyphs, so single-character strings won't reproduce all of the features of general layout.
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