NAME

       GooCanvas2::CairoTypes - Bridge between GooCanvas2 and Cairo types

SYNOPSIS

               use GooCanvas2;
               use GooCanvas2::CairoTypes;

               my $pattern = Cairo::SolidPattern->create_rgba(0, 0, 0, 0);
               my $rect = GooCanvas2::CanvasRect->new(
                       ...,
                       'fill-pattern' => $pattern,  # fails without CairoTypes, just works with
               );

               # Sometimes (but not always, no idea why) this fails:
               $rect->get('fill-pattern')->set_filter('linear);
               # Here's the solution:
               GooCanvas2::CairoTypes::cairoize_pattern($rect->get('fill-pattern'))
                       ->set_filter('linear);

DESCRIPTION

       There is an issue in the interaction between GooCanvas, GObject Introspection, Cairo, and
       their Perl bindings, which causes some functionality to be unusable from Perl side. This
       is better described here <https://stackoverflow.com/questions/64625955/cairosolidpattern-
       is-not-of-type-goocanvas2cairopattern>, and there was an attempt
       <https://gitlab.gnome.org/GNOME/goocanvas/-/merge_requests/9> to fix it upstream. Until
       it's fixed, this can serve as a workaround for it.

       Currently this module only "fixes" "Cairo::Pattern/GooCanvas2::CairoPattern" interop. For
       certain calls it just works if this module was included; for some other calls you need to
       explicitly convert the type.

       If you have any idea how to fix those cases to not require such call, or need to bridge
       more types, pull requests <https://github.com/DarthGandalf/GooCanvas2-CairoTypes> are
       welcome!

AUTHOR

       Alexey Sokolov, <sokolov@google.com>

COPYRIGHT AND LICENSE

       Copyright (C) 2021 by Google

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.22.3 or, at your option, any later version of
       Perl 5 you may have available.