[webkit-qt] Using custom fonts with webkit

[note173 note]

My program has a data of a few types of custom fonts, it contains list of
characters with their widths ({'a' : 10, 'b' : 10, 'c' : 9, ...} and some
information like font height, family, weight etc.
And there is a page loaded in QWebPage. There are many text items with
different fonts and text sizes.
I need webkit to use my font data for every font in page and calculate
layout correctly.
I don't need to draw a text, just the layout.

So how could it be done?

// writing something that works like opera mini
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