bug#36315: 27.0.50; SVG transparency handling is inaccurate

[Eli Zaretskii]

> Date: Thu, 27 Jun 2019 12:33:46 +0900
> From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> Cc: pipcet@gmail.com,
>       36315@debbugs.gnu.org
> 
> > > What kind of operations do you think librsvg should provide us with,
> > > instead of letting us use cairo?
> > 
> > Those for which you called the Cairo functions directly.
> 
> Which one, concretely?  Or you mean something in other parts?

All of the Cairo functions you called:

   cairo_create
   cairo_destroy
   cairo_image_surface_create
   cairo_image_surface_get_data
   cairo_image_surface_get_stride
   cairo_paint
   cairo_set_source_rgb
   cairo_surface_destroy
   cairo_surface_flush
   cairo_surface_status

> > I tried with the second patch.  I tried now again with the above one:
> > still no rectangle.
> 
> Seems like a problem in DLL loading.  Please try the attached one.

This works, but I don't think I see any difference in the color of the
rectangle wrt what I see in Emacs 26, i.e. without the patch.

Thanks.