On 01.07.2014 22:05, Nicolai Hess wrote:

2014-07-01 3:16 GMT+02:00 Igor Stasenko <siguctua@gmail.com>:



On 30 June 2014 21:36, Nicolai Hess <nicolaihess@web.de> wrote:
The real question was:
Why can't we draw a text with StrikeFont and with Athens.

Igor, can't we use AthensCairoText (cairo toy text api) for non-truetype fonts?


Because strike fonts are stored in special format which you cannot render directly by cairo library. Because strike fonts are not scalable. Because it will be horribly slow. Choose one.



I choose the first one, horrible slow or not scaleable is better than a drawing error :)

If someday all rendering is done through Athens, how do we solve this problem with the StrikeFont?
You would have to implement a special rendering path for StrikeFonts utilizing essentially the same method used for rendering bitmaps.
In theory, if cairo bitmap perf is about the same as traditional bitmap perf, that'd be about as slow as FT-rendering is in non-cairo images, if there's no scaling involved.
Scaled, it would probably look horrible, take a screenshot of this mail, zoom to 400% in Paint or something, that's what to expect.
(Though, one *could* do some tricks translating point size /scale factor to another font with point size closer to the final result (if one exists) and get slightly less horrible results)

Cheers,
Henry��