font configuration through gconf

[dsd]

Sugar currently has fonts configured in 2 places - gtkrc and style.py. Neither can be easily modified by implementors/deployers.

As a first step to implementing  http://wiki.sugarlabs.org/go/Features/Font_configuration here are some patches which add gconf-based font configuration.

I learned some things while doing this so the feature proposal will benefit from some tweaks based on the outcome of this ticket (which I'll do at that point)

[dsd]

sugar patch

[dsd]

sugar-toolkit patch

[sascha_silbe]

You are replacing two different fonts (Sans Serif 10 in gtkrc, Bitstream Vera Sans 10 in style.py) with a single one (Sans Serif 10). That's probably fine (though I don't know where in the UI each of them was used), but there should be a conscious decision about it.

[dsd]

Yes. I think it was only a bug that these faces were different. It wasn't like that in 0.82. Perhaps someone forgot to update style when they changed gtkrc.

The Vera Sans option in the style module is not used much across the desktop.

[tomeu]

I'm a bit concerned about activity startup performance, can you check what difference it makes on the XO-1?

[dsd]

Very little, gconf values are already read in that very same codepath.

I measure 1.5ms increase in startup time, but much of that 1.5ms will be the time needed to execute the system call to read the clock in my measurement code.

[dsd]

committed and  http://wiki.sugarlabs.org/go/Features/Font_configuration updated