[cairo] Cairo/PNG shaked up.

Owen Taylor otaylor at redhat.com
Sun Apr 17 10:14:13 PDT 2005

On Sun, 2005-04-17 at 17:28 +0200, Hans Breuer wrote:
> Am 12.04.2005 um 16:19 schrieb Carl Worth:
> > On Sun, 10 Apr 2005 22:35:04 +0100, "Hans Breuer" wrote:
> >> While updateing my Cairo/Dia plug-in [1] I stumpled not only about
> >> about lost convenience [2] (PNG output needs to be special cased now)
> >
> > Well, it's different convenience, not lost. The idea is that now
> > you'll be able to take your xlib_surface and then generate PNG output
> > from it with cairo_surface_write_png, (rather than having to create a
> > distinct png_surface type in the first place).
> >
> >> but also about Cairo apprently not respecting the scale of the output
> >> anymore [3] or the image backend is missing some appropriate DPI 
> >> default.
> > [...]
> >> [3] http://hans.breuer.org/dia/render-test-shaked-up.png
> >
> > I'm not sure what that image is supposed to look like, but I did just
> > fix a bug with cairo_show_surface in which the data was being
> > translated to the wrong place, (resulting in the display of garbage
> > memory). You might give the latest in CVS a try and see if it's any
> > better. Otherwise, let me know more specifically what's going wrong.
> >
> Just tested with current cvs and the defect is still the same. It seems
> as if cairo_scale(about 20x) does not have an effect at all.
> The broken and right output (generated with a prevoius version)
> are at http://hans.breuer.org/dia/dia-cairo-broken.htm

I don't think this has anything to do with the PNG changes ... more
likely something to do with the recent matrix changes. But Cairo scale
seems to be working in general. Would it be possible to come up with
a small test case?

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