Re: GtkImageView

[Torsten Schoenfeld <kaffeetisch gmx de>]

On Mon, 2007-12-17 at 14:11 +0100, Jeffrey Ratcliffe wrote:
> > Unfortunately, there's no automatic way to convert raw structs to Perl
> > land.  In this case, I think the best option would be to represent
> > GdkPixbufDrawOpts as a hash reference with keys zoom, zoom_rect, etc.
> > For an example of this kind of thing, take a look at the way
> > GtkStockItem is handled in Gtk2/xs/GtkStock.xs.
>
> Ah. Thanks! Might I suggest that this and the GdkEvent issue be added
> to binding_howto.pod?

Sounds like a good idea.  Can you take a stab at it?  The formulations
might make more sense to newcomers if they're written by someone who
just recently learned about them.

> > Once you have the converter newSVGdkPixbufDrawOpts[1], you can take this
> > one step further by installing a custom typemap for GdkPixbufDrawOpts:
> > "GdkPixbufDrawOpts * T_GPERL_GENERIC_WRAPPER" in a typemap file
> > installed via ExtUtils::Depends->add_typemaps in Makefile.PL -- like
>
> OK. Almost working. As my Perl is much better than my C these days, I
> just can't find the correct syntax:
>
> IImageTool.xs: In function `newSVDrawSettings':
> IImageTool.xs:33: error: cannot convert to a pointer type
> IImageTool.xs: In function `SvDrawSettings':
> IImageTool.xs:62: error: incompatible types in assignment
>
> where the relevant lines are:
>
>   hv_store (hv, "zoom_rect", 9, newSVGdkRectangle (settings->zoom_rect), 0);
>
> and
>
>   if (svp) settings->zoom_rect = SvGdkRectangle (*svp);

You're trying to use a GdkRectangle where a GdkRectangle* is wanted.  I
think this should work:

  hv_store (hv, "zoom_rect", 9, newSVGdkRectangle (&(settings->zoom_rect)), 0);

  if (svp) settings->zoom_rect = *(SvGdkRectangle (*svp));

If the settings struct passed into newSVDrawSettings might be free'd
while the corresponding hash reference still lives, you might have to
use newSVGdkRectangle_copy instead.

By the way, why 'DrawSettings' instead of 'GdkPixbufDrawOpts'?
-- 
Bye,
-Torsten