Re: [Vala] cairo binding bug?

[Nor Jaidi Tuah]

The way I understand the documentation at

http://www.cairographics.org/manual/cairo-Paths.html

is that a Path can either be constructed through a cairo
context, i.e., using

   new_path
   move_to
   line_to
   arc_to
   etc

and such a path can be read using either

   copy_path
   copy_path_flat

But a path can also constructed manually, i.e.
not through a cairo context.

I think I understand now why the binding does
not allow "new Cairo.Path". (I may be wrong
here, so please correct me). This is due to
a limitation in vapi. According to the cairo documentation,
a path obtained using copy_path and copy_path_flat
must be disposed using cairo_path_destroy, hence
the following lines in cairo.vapi:

[Compact]
[CCode (free_function = "cairo_path_destroy", etc]
public class Path { etc }

But, the cairo documentation also states that a
manually constructed path must also be destroyed
manually (i.e., not using cairo_path_destroy).
Hence the vapi cannot provide "new Cairo.Path"
because of the inappropirate free_function.

If alternative free_function is a common expectation
in the commonly used libraries, vala should
address this issue.

Please correct me if I'm wrong.

Nice day
Nor Jaidi Tuah





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Re: [Vala] cairo binding bug?

[Luca Bruno]

On 26/06/2014 03:24, Nor Jaidi Tuah wrote:
> According to http://www.cairographics.org/manual/cairo-Paths.html,
>
>The path may be either the return value from one of cairo_copy_path()
>or cairo_copy_path_flat() or it may be constructed manually.
>
> But, trying to construct a path manually, i.e.,
>
>   var path = new Cairo.Path ();
>
> gives a compiler error:
>
>   error: `Cairo.Path' does not have a default constructor
>
> Am I doing this the wrong way, or is this a binding bug?
See http://valadoc.org/#!api=cairo/Cairo.Context.new_path
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Re: [Vala] cairo binding bug?

[yannick inizan]

Not a bug, Path is a compact class and haven't constructor.
So when you'll have a Context, do this :


Cairo.Context cr;
..
Cairo.Path path = cr.copy_path();

regards ;)


2014-06-26 3:24 GMT+02:00 Nor Jaidi Tuah :

> According to http://www.cairographics.org/manual/cairo-Paths.html,
>
>The path may be either the return value from one of cairo_copy_path()
>or cairo_copy_path_flat() or it may be constructed manually.
>
> But, trying to construct a path manually, i.e.,
>
>   var path = new Cairo.Path ();
>
> gives a compiler error:
>
>   error: `Cairo.Path' does not have a default constructor
>
> Am I doing this the wrong way, or is this a binding bug?
>
>
> Nice day
> Nor Jaidi Tuah
>
>
>
>
>
> PRIVILEGED/CONFIDENTIAL information may be contained in this message. If
> you are neither the addressee (intended recipient) nor an authorised
> recipient of the addressee, and have received this message in error, please
> destroy this message (including attachments) and notify the sender
> immediately. STRICT PROHIBITION: This message, whether in part or in whole,
> should not be reviewed, retained, copied, reused, disclosed, distributed or
> used for any purpose whatsoever. Such unauthorised use may be unlawful and
> may contain material protected by the Official Secrets Act (Cap 153) of the
> Laws of Brunei Darussalam. DISCLAIMER: We/This Department/The Government of
> Brunei Darussalam, accept[s] no responsibility for loss or damage arising
> from the use of this message in any manner whatsoever. Our messages are
> checked for viruses but we do not accept liability for any viruses which
> may be transmitted in or with this message.
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