On Mar 18, 2008, at 4:40 PM, Ross Carter wrote:
I found that I can call the NSLayoutManager methods for modifying glyph storage (replaceGlyphAtIndex:withGlyph:, insertGlyph:atGlyphIndex:characterIndex:, etc.) without errors if I place the code in an override of NSATSTypesetter - beginLineWithGlyphAtIndex: and inform the typesetter of any change in glyph count by calling setParagraphGlyphRange:separatorGlyphRange:.
If I understand it correctly, what you want to do is to modify the glyphs before the stock system typesetter has a chance to do any layout with them, and then let the stock system typesetter lay out the modified glyphs as it would have if those had been the original glyphs. In that case, whatever typesetter method you override will need to be early in the process, before the typesetter has obtained the glyphs it is going to lay out. I'm not sure whether - beginLineWithGlyphAtIndex: is the most appropriate place, but I will take a look at it and see what I can determine.
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