fixed screen 'smearing' on 1366 X 768 and other displays

[zschroeder6212]

The current implementation uses the screen resolution retrieved from the fb_var_screeninfo struct which doesn't always match the width of the frame buffer. I fixed the issue by calculating the width of the frame buffer using the line length, which is more accurate.

Before: After:

[ponty]

Thanks but this breaks the tests: python3 vfb.py

The problem is the 1 bit color:

# fbset -g 640 480 640 480 1 
# ./framebuffer-vncserver  
Initializing framebuffer device /dev/fb0...
Floating point exception (core dumped)

bits_per_pixel / 8 = 0

fb_xres = fix_scrinfo.line_length / (var_scrinfo.bits_per_pixel / 8);

[zschroeder6212]

That should fix it.

[zschroeder6212]

Sorry, that still only works on 32 bit color.

[zschroeder6212]

That works.

[ponty]

Thanks.