Add ability to use loaded font with Image::from_text

[runnerpack]

Unless I'm dense, I don't see a way to render a Gosu::Image from text using a previously loaded (and modified with Font#[]=) Gosu::Font, since the latter takes the name of a font as an argument, rather than a Gosu::Font instance.
Could this be put on the enhancement list?

[jlnr]

You are right, Font#[]= and Image::from_text are not compatible right now. The technical/philosophical background is that Gosu::Font is a bitmap font with no support for kerning, and Image::from_text will apply proper kerning, which results in prettier but more expensive text rendering. This is also why Font#width and Image#text_width are separate methods with separate results.

I think the best way forward would be to add kerning support to Font so that both mechanisms become more interchangeable.

[runnerpack]

Thank you for the clarification. My current use case doesn't really need the extra performance of prerendered text, so I'll just use the Font#draw_* methods, perhaps with Gosu#record where appropriate.