Re: Render Text to Pixbuf

["Jonathon Jongsma" <jonathon jongsma gmail com>]

On 5/1/07, Paul Davis <pjdavis engineering uiowa edu> wrote:
> Ooops, those links would probably be useful.
>
> http://lsdcas.engineering.uiowa.edu/test.jpg
> http://lsdcas.engineering.uiowa.edu/test2.jpg
>
> The first image makes it fairly apparent that cairo is expecting 32bit
> data even when there's no alpha channel. Also after playing with it a
> bit, I realized that the color channels are also switched compared to
> what the pixbuf expects.

Yes, I guess if you had tried to draw the text in a color other than
white or black, you'd probably see some even more interesting
effects...

> I managed to get a not so good method working.  I create a scratch
> cairo context using Cairo's image surface.  Then I just use cairo to
> draw to this offscreen buffer and copy it onto my pixbuf where it
> goes.  Copying from the surface to the pixbuf causes some artefacts
> around the edges of the text due to smoothing, but its good enough for
> now unless someone has a better idea.

too bad.  I was hoping my quick-and-easy idea would work, but it looks
like the formats aren't compatible enough to make it easy...  I guess
if I were you, I'd ask on a gtk or cairo mailing list as I'm sure
somebody has wanted to do this before.  Maybe somebody there knows a
clever way to do it.

--
jonner