1GooCanvas2::CairoTypes(U3s)er Contributed Perl DocumentatGiooonCanvas2::CairoTypes(3)
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NAME

6       GooCanvas2::CairoTypes - Bridge between GooCanvas2 and Cairo types
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SYNOPSIS

9               use GooCanvas2;
10               use GooCanvas2::CairoTypes;
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12               my $pattern = Cairo::SolidPattern->create_rgba(0, 0, 0, 0);
13               my $rect = GooCanvas2::CanvasRect->new(
14                       ...,
15                       'fill-pattern' => $pattern,  # fails without CairoTypes, just works with
16               );
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18               # Sometimes (but not always, no idea why) this fails:
19               $rect->get('fill-pattern')->set_filter('linear);
20               # Here's the solution:
21               GooCanvas2::CairoTypes::cairoize_pattern($rect->get('fill-pattern'))
22                       ->set_filter('linear);
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DESCRIPTION

25       There is an issue in the interaction between GooCanvas, GObject
26       Introspection, Cairo, and their Perl bindings, which causes some
27       functionality to be unusable from Perl side. This is better described
28       here <https://stackoverflow.com/questions/64625955/cairosolidpattern-
29       is-not-of-type-goocanvas2cairopattern>, and there was an attempt
30       <https://gitlab.gnome.org/GNOME/goocanvas/-/merge_requests/9> to fix it
31       upstream. Until it's fixed, this can serve as a workaround for it.
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33       Currently this module only "fixes"
34       "Cairo::Pattern/GooCanvas2::CairoPattern" interop. For certain calls it
35       just works if this module was included; for some other calls you need
36       to explicitly convert the type.
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38       If you have any idea how to fix those cases to not require such call,
39       or need to bridge more types, pull requests
40       <https://github.com/DarthGandalf/GooCanvas2-CairoTypes> are welcome!
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AUTHOR

43       Alexey Sokolov, <sokolov@google.com>
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46       Copyright (C) 2021 by Google
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48       This library is free software; you can redistribute it and/or modify it
49       under the same terms as Perl itself, either Perl version 5.22.3 or, at
50       your option, any later version of Perl 5 you may have available.
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54perl v5.34.0                      2022-01-21         GooCanvas2::CairoTypes(3)
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