Function 39, subfunction 2 - get pixel from the background image.
Parameters:
- eax = 39 - function number
- ebx = 2 - subfunction number
- ecx = offset
Returned value:
- eax = 0x00RRGGBB - pixel color, if offset is valid
(less than 0x160000-16)
- eax = 2 otherwise
Remarks:
- Do not rely on returned value for invalid offsets, it may be
changed in future kernel versions.
- Offset for pixel with coordinates (x,y)
is calculated as (x+y*xsize)*3.
- There is a pair function to set pixel on the background image -
subfunction 2 of function 15.