[Gambas-user] Big change in revision #5382

[Jussi Lahtinen]

>
> I have removed the old Draw class and replaced it with a new Draw class
> implemented in Gambas inside the gb.gui.base component, that emulates
> the old Draw class by using the Paint class.
>
> I'm starting to remove as much X11 specific code as possible in the
> Gambas source code, and the Draw class was completely based on the old
> deprecated X11 drawing API of GTK+, so...
>
> Many new methods were added to the Paint class to help the
> implementation of the Draw emulation class.
>
> Of course (!) expect some quirks:
>
> - The emulation is not perfect yet, and it won't be 100% compatible
> pixel to pixel.
>
> - Expect some performance loss, even if I try to avoid them as much as
> possible.
>
> - Drawing lines with Cairo is a lot slower that drawing lines with X11,
> even if antialiasing is disabled.
>
> - There is a bug at the moment if you imbricate calls to Paint.Begin()
> on the same device. It should work, but apparently it does not...
>
> - Source code clean-up is not finished.
>
> But there is one good news: if you have old printing code from Gambas 2
> based on the Draw class, you can now use it directly in Gambas 3 without
> having anything to change (theoritically).
>
> All that is an investment to the future, when Wayland will replace X11.
>

I know too little about how these things work...
Does this performance loss apply only to GTK+, or does it have effect also
to Qt4?


Jussi