kalle.vahlman at gmail
Mar 11, 2008, 9:36 AM
Post #2 of 2
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Re: Example of tranparent plugin for Home
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2008/3/11, Johan Bilien <jobi [at] via>:
> Hi,
>
> I put an example of transparent home plugin at:
> https://stage.maemo.org/svn/maemo/projects/haf/trunk/hildon-home-weather/
>
> It's not meant to be functional but to be an illustration on how to
> build transparent applets using cairo.
>
> Please report any issue or question!
Well, since you asked for it ;) here's some comments:
/* Initialize the pixmap with a full empty transparent rectangle */
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
There's CAIRO_OPERATOR_CLEAR, is there particular reason for not using
it? Conceptually it could even be faster than source op since it
simply ignores the source but I guess it depends on what it actually
is reduced to (for example memset vs memcpy).
Also, you could use cairo_create_similar() to create cairo surfaces to
hold the image data instead of creating a GdkPixmaps, it's designed to
do what you want with less code what there is now.
--
Kalle Vahlman, zuh [at] iki
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