[cairo] cairo built against libpng16

[pgajdos at suse.cz]

Hi,

simple program attached seems to have different results when 
cairo is built against libpng15 and when it is built against 
libpng16*):

cairo-libpng15-changeroot> ./cairo-fail tmp.png
PNG image read.

cairo-libpng16-changeroot> ./cairo-fail tmp.png
Error reading PNG image tmp.png: out of memory


The difference between changeroots are really only libpng version:
@@ -141,9 +141,9 @@ libpcrecpp0-8.31-5.1.x86_64
 libpcreposix0-8.31-5.1.x86_64
 libpixman-1-0-0.28.2-3.1.x86_64
 libpixman-1-0-devel-0.28.2-3.1.x86_64
-libpng15-15-1.5.14-1.1.x86_64
-libpng15-compat-devel-1.5.14-1.1.x86_64
-libpng15-devel-1.5.14-1.1.x86_64
+libpng16-16-1.6.0-25.1.x86_64
+libpng16-compat-devel-1.6.0-25.1.x86_64
+libpng16-devel-1.6.0-25.1.x86_64
 libpopt0-1.16-20.1.x86_64
 libppl9-0.11.2-15.1.x86_64
 libppl_c4-0.11.2-15.1.x86_64

cairo-libpng1{5,6}-changeroot> rpm -q cairo-devel
cairo-devel-1.12.14-0.x86_64

Petr


*) This boiled down when building perl-Cairo against cairo(libpng16).
40-th test from CairoSurface.t failed. In turn that means that second
test from the following doesn't succed.

use strict;
use warnings;

use Test::More tests => 2;

use constant IMG_WIDTH => 256;
use constant IMG_HEIGHT => 256;

use Cairo;

my $surf = Cairo::ImageSurface->create ('rgb24', IMG_WIDTH,
IMG_HEIGHT);
is ($surf->write_to_png ('tmp.png'), 'success');

$surf = Cairo::ImageSurface->create_from_png ('tmp.png');
is ($surf->status, 'success');

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