ok. I got it. This is because chromium's skia engine supports resampling kernel. This could not depends on xrender. But pixman which is used by cairo current does not support resampling.
(In reply to comment #47)
> Created an attachment (id=419101) [details]
> screenshot of chrome, firefox w/wo extend_pad
>
> Chrome has better quality than firefox with cairo_extend_pad. Does anyone know
> why?
> Thanks
ok. I got it. This is because chromium's skia engine supports resampling kernel. This could not depends on xrender. But pixman which is used by cairo current does not support resampling.
(In reply to comment #47)
> Created an attachment (id=419101) [details]
> screenshot of chrome, firefox w/wo extend_pad
>
> Chrome has better quality than firefox with cairo_extend_pad. Does anyone know
> why?
> Thanks