Re: Kerning

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Re: Kerning
by christoph on Thursday 30/Aug/2007, @10:50

You are right about the API and internal calculations using qreals, but the actual rendering is not done in sub-pixel positioned precision.

Try rendering a couple of letters each moved by a fractional pixel coordinate, and you will see that they all end up looking the same.

Compare that to KPDF's rendering (3.5.7, didn't try 3.91 yet), where the bitmap of a letter is different depending on (sub-pixel) position.

Of course it also has to do with Qt (or FreeType?) trying very hard to cache the bitmaps. In earlier versions of Qt/FreeType, you could bypass caching by scaling with, say, a factor of 1.00001, and get very good results. But in recent versions, the cache is used even for rotated fonts, making the result look really funny.

And seeing the good quality of KPDF and its good speed, I doubt that a Word Processor couldn't get nearly the same results.

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