[chrox]

Originally Posted by sadowski

Here come shots of the result with line_length+0..4 plus how the page looks like in FBReader. The picture of the clock on top is least distorted with +4 but still way to goand with +5 it crashes.

Likewise, using smem_len gives a segfault.

It really goes in the right way from +1 to +4. But the detected screen height might be larger than actual one so that the application crashes before pitch size goes right.

Could you also screen shot with these changes?

elseif vinfo.bits_per_pixel == 8 then
            self.bb = BB.new(vinfo.xres, vinfo.yres/2, BB.TYPE_BB8, self.data, finfo.line_length + 5)
else

to

elseif vinfo.bits_per_pixel == 8 then
            self.bb = BB.new(vinfo.xres, vinfo.yres/2, BB.TYPE_BB8, self.data, finfo.line_length + 8)
else

which only use the first half height of the screen for test and increases pitch size from finfo.line_length + 5 to finfo.line_length + 8. I expect a sane half screen in one of the four trials.

And could you also print some basic info of the framebuffer at line 40 like this:

print("pitch size", finfo.line_length)
print("framebuffer size", finfo.smem_len)
print("framebuffer width", vinfo.xres)
print("framebuffer height", vinfo.yres)