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Home » U++ Library support » U++ Libraries and TheIDE: i18n, Unicode and Internationalization » Basic character set analyzer
Re: Basic character set analyzer [message #19903 is a reply to message #19890] Sat, 31 January 2009 13:22 Go to previous messageGo to previous message
cbpporter is currently offline  cbpporter
Messages: 1401
Registered: September 2007
Ultimate Contributor
I've made great progress today and all fonts are capable of displaying almost all Latin characters and compositions. There is one last problem and this is a big one.

Let's say that I'm trying to draw 'à' (a`). First I draw 'a', and then a '`'. With the new methods I added when I interrogate the font for the top and bottom of '`', I will get something in the vicinity of 2 for top (it doesn't start exactly at the top of the line) and something in the vicinity of 5 for bottom (these numbers are just for example). I need this info, rather then ascent/height. And it works for most fonts. But there are some fonts which will return 0 for the top and the height of the font for bottom. So instead of getting (2, 5), I will get (0, 18) and this ruins all computations and causes the diacritic to be severely misplaced. This is not the correct value for the API calls that I have made, and I think it is the fault of the font designer, who did not alter the vertical extent information of the character and just went with the default font height.
I hope I was successful in explaining this issue.

I don't know how I could fix this, safe for rendering the character in a white bitmap buffer, and shrinking the bitmap line by line until I have reached the minimal height and caching the result. I'm afraid such a method will be slow, and anyway I would rather not take such extreme measures.

There is one other solution: define one global font for diacritics and draw all diacritics with that font. This will cause repeated renderings of 'à' (a`) with different fonts to have a visually different base, but the diacritic is going to look constant. I think this is a reasonable compromise.

What do you think?

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