Re: [Vala] offscreen bitmap example.

[Nor Jaidi Tuah <norjaidi tuah ubd edu bn>]

> Any example on how to use an offscreen bitmap in vala gtk ?
> I need to show an image generated via 3d rendering but I cannot
> recreate it
> on every draw request.

I suggest you look at pixbuf:

https://valadoc.org/gdk-pixbuf-2.0/Gdk.Pixbuf.html

First create an off-screen pixbuf using one of its
creation methods.

Then create a cairo context to write onto the
pixbuf using:

https://valadoc.org/gdk-3.0/Gdk.cairo_surface_create_from_pixbuf.html

You can copy the pixbuf onto another cairo surface
(the visible widget) using:

https://valadoc.org/gdk-3.0/Gdk.cairo_set_source_pixbuf.html

My vala project at https://sourceforge.net/projects/pasang-emas/
uses pixbuf, but I don't have any conveniently distilled example.

Nice day
Nor Jaidi Tuah




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