Hi Stefan,
I am also in the process of converting my app from v2 to v3, where I do *lots* of drawing. So before jumping in, I decided to revisit a drawing example I posted some years ago to first convert it to v3 and its drawing to Cairo.
In the hope of being useful for others, I have posted the converted code here: https://gitlab.com/ivor/GTK3-Cairo
An overview of some of the concepts exampled:
- Programmatically generated RGB buffers converted to cairo surface for display
- Multiple background surfaces maintained over the lifetime of the program
- Copying between Cairo surfaces
- Drawing effects based on user input
- Fade Transition effect between drawings using the alpha channel
Enhancing this to demonstrate multi-threaded drawing should be a trivial task.
cheers,
richard
On Wed, Jul 29, 2015 at 8:55 AM, Stefan Salewski <mail@xxxxxxxxxxxx> wrote:
On Wed, 2015-07-29 at 13:05 +0100, Emmanuele Bassi wrote:
> If you have legacy code that requires disabling double buffering, you
> should probably invest some time into porting it to a proper solution
> integrated with the GTK drawing model;
It would be great if someone could port this example to GTK3:
http://www.cairographics.org/threaded_animation_with_cairo/
Some months ago I was going to port that to Nim to test my GTK3 and
Cairo bindings (https://github.com/StefanSalewski?tab=repositories) and
to have one more example.
But then I discovered that this one seems to be still GTK2, and has
gtk_widget_set_double_buffered(window, FALSE);
I may be able to get that C code to compile with GTK3, but unfortunately
I may not be able to make it a really fine GTK3/Cairo example, so it
would not make much sense to convert it to Nim then.
Does someone know another fine small GTK3/Cairo example (C, C++, Ruby,
Python -- or maybe arbitrary other language) which is not outdated?
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