Subj : GUI implementation
To   : tenser
From : apam
Date : Tue May 23 2023 04:45 pm

Hi

I was wondering do you know much about GUI implementation?

I've been working on my OS, and I'm trying to improve the speed. I
*think* the GUI is a bottleneck.

Presently, the "window manager" is built into the kernel, and every 5
ticks (jiffies if you like) it processes input and redraws the frame
buffer.

The framebuffer is a vesa 1024x768 framebuffer (32bit), and I am
redrawing the desktop, then each of the icons, then the windows then
drawing the mouse pointer.

So essentially everything is getting redrawn whether it's changed or not.

I think I should only be drawing things that are either visible or
changed, but I just can't wrap my head around how to do this without
making it just as complex as just redrawing everything.

I am drawing on a buffer, then flipping it onto the framebuffer at the
end.

Do you know a good resource for learning this?

Thanks,
Andrew


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