03-20-2011
Hi!
This may not be what You want to hear but there are so many stripped down OS-distributions already. Maybe it's part of Your work but I personally wouldn't go through re-inventing the wheel for every hardware that You will need support for. Unless that IS Your goal with Your studies.
FreeDOS, Linux, or BSD based. The have most of what You need for hardware support and fit on anything from a floppy to a credit card sized CD. And on lots hardware architectures. The first thing I would do is to take any of those, maybe even a normal distro, auto login a user (from inittab or tty1.conf) and start the desired application. No window managers or other fluff. Maybe You don't need a GUI? Even easier. Determine what You can remove in terms of services and unused programs. Most drivers are modularised. But all that is with regard to disc space, if it ain't running, it won't consume any RAM or CPU.
And please be aware that there is a big difference between what comes with the OS and the user environment, that's usually what makes the distributions unique. The OS (kernel and drivers) doesn't contain very much "user friendly mess". And that is a good thing!
Best regards,
Lakris
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LEARN ABOUT REDHAT
scroll_screen
scroll_screen(3alleg4) Allegro manual scroll_screen(3alleg4)
NAME
scroll_screen - Requests a hardware scroll request. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int scroll_screen(int x, int y);
DESCRIPTION
Attempts to scroll the hardware screen to display a different part of the virtual screen (initially it will be positioned at 0, 0, which is
the top left corner). You can use this to move the screen display around in a large virtual screen space, or to page flip back and forth
between two non-overlapping areas of the virtual screen. Note that to draw outside the original position in the screen bitmap you will have
to alter the clipping rectangle with set_clip_rect().
Mode-X scrolling is reliable and will work on any card, other drivers may not work or not work reliably. See the platform-specific section
of the docs for more information.
Allegro will handle any necessary vertical retrace synchronisation when scrolling the screen, so you don't need to call vsync() before it.
This means that scroll_screen() has the same time delay effects as vsync().
RETURN VALUE
Returns zero on success. Returns non-zero if the graphics driver can't handle hardware scrolling or the virtual screen is not large enough.
SEE ALSO
set_gfx_mode(3alleg4), show_video_bitmap(3alleg4), request_scroll(3alleg4), request_video_bitmap(3alleg4), exscroll(3alleg4)
Allegro version 4.4.2 scroll_screen(3alleg4)