Unicode char comparison puzzle

[tcab]

Thanks guys - very helpful.
Am now working on an optimised algorithm that:

• Caches the 'signature' of the glyph that represents a boring/non juicy character
• Scans only a portion of the pixels of a rendered character
  

as it turns out that I get just as accurate results scanning only a few pixel rows/cols of a character, and it speeds up scanning enormously. It will be interesting to discover how low I can go and still get accurate results!

I measured the width of a character font size 2 using the return value of TEXTOUT_P as being 12 pixels. Is there any similar technique to determine a character's height?