On Fri, 29 Aug 2008, Jeremy Huddleston - email@hidden wrote:
I just want you to tell me a program that you're trying to use that doesn't
work and give me the steps I need to take to execute said program and see it
not working.
Okay the programs I use that need 8-bit are really huge and not open
source so I put together a simple example program.
With an Xserver that has a 24-bit TrueColor visual:
$ ./pc TrueColor 24
With an Xserver that has a 15-bit DirectColor visual:
$ ./pc DirectColor 15
With an Xserver that has an 8-bit PseudoColor visual:
$ ./pc PseudoColor 8
You should get a window with a line or two for 10 seconds and then the
window will disapper.
mzs
PS: Right now you get the expected "visual not found" error when you try
to run it with PseudoColor 8-bit because the XMatchVisualInfo() fails. But
when I run in an 8-bit Xvnc server that works fine, as does my legacy
8-bit X11 app.
PPS: This sample pc program is so simple it does not repaint or anything.
It is best to have X11.app and the window manager already running and not
have anything cover the window that pops-up. Otherwise you may get a
really strange window pop-up.
/* gcc -DEBUG pc.c -o pc -L/usr/X11/lib -lX11 */
/* gcc pc.c -o pc -L/usr/X11/lib -lX11 */
/*
* Cobbled together from:
* http://bellet.info/XVideo/testxv.c
* http://users.actcom.co.il/~choo/lupg/tutorials/xlib-programming/xlib-programming.html
*/
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
/* trick to verbosely do an expression */
#ifdef EBUG
#define debug(expr, fmt, args...) \
((void)fprintf(stderr, "%s = " fmt "\n", # expr, expr, ## args))
#else
#define debug(expr, fmt, args...) (void)(expr)
#endif
/* Used to fill in the name class array */
#define NC(c) { # c, c }
/* Used to match class name strings to the constants used by XLib */
static struct {
char *name;
int class;
} nc[] = {
NC(PseudoColor),
NC(GrayScale),
NC(DirectColor),
NC(TrueColor),
NC(StaticColor),
NC(StaticGray)
};
/* Number of elements in an array */
#define NELEM(a) (sizeof (a)/sizeof ((a)[0]))
/* gross way of marking the falied lookup, but whatever */
static int
nclkup(char *name)
{
int i;
for (i = 0; i < NELEM(nc); i++) {
debug(i, "%d:");
debug(nc[i].name, "%s");
debug(nc[i].class, "%d");
if (strcmp(nc[i].name, name) != 0)
continue;
return (nc[i].class);
}
/* Mark that the lookup failed */
i = name[0];
name[0] = 0;
return (i);
}
int
main(int argc, char *argv[])
{
int width = 320;
int height = 200;
Display* dpy;
XSetWindowAttributes xswa;
XVisualInfo xvi;
Window window;
XGCValues vals;
GC gc;
XEvent event;
unsigned long mask;
int res, screen, class, depth;
if (argc != 3) {
(void)fprintf(stderr, "Usage %s class depth\n", argv[0]);
(void)fprintf(stderr, " examples:\n");
(void)fprintf(stderr, " %s PseudoColor 8\n", argv[0]);
(void)fprintf(stderr, " %s TrueColor 24\n", argv[0]);
return (2);
}
class = nclkup(argv[1]);
if (argv[1][0] == 0) {
argv[1][0] = class;
(void)fprintf(stderr, "%s: bad class: %s\n", argv[0], argv[1]);
return (1);
}
errno = 0;
debug(depth = strtoul(argv[2], NULL, 10), "%d, argv[2] = %s", argv[2]);
if (errno != 0) {
(void)fprintf(stderr, "%s: bad depth argument: %s\n",
argv[0], strerror(errno));
return (1);
}
debug(dpy = XOpenDisplay(NULL),
"0x%x");
if (dpy == NULL) {
(void)fprintf(stderr, "Cannot connect to X server\n");
return (1);
}
debug(screen = DefaultScreen(dpy), "%d");
if (screen < 0) {
fprintf(stderr, "%s: screen not found\n", argv[0]);
return (1);
}
debug(res = XMatchVisualInfo(dpy, screen, depth, class, &xvi), "%d");
if (res == 0) {
fprintf(stderr, "%s: visual not found\n", argv[0]);
return (1);
}
debug(xswa.colormap = XCreateColormap(dpy, DefaultRootWindow(dpy),
xvi.visual, AllocNone), "0x%x");
xswa.event_mask = StructureNotifyMask | ExposureMask;
xswa.background_pixel = 0;
xswa.border_pixel = 0;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
debug(window = XCreateWindow(dpy, DefaultRootWindow(dpy),
0, 0,
width,
height,
0, xvi.depth,
InputOutput,
xvi.visual,
mask, &xswa), "0x%x");
debug(XMapWindow(dpy, window), "%d");
do {
XNextEvent(dpy, &event);
}
while (event.type != MapNotify || event.xmap.event != window);
debug(gc = XCreateGC(dpy, window, 0, &vals), "0x%x");
debug(XSetForeground(dpy, gc, BlackPixel(dpy, screen)), "%d");
debug(XSetBackground(dpy, gc, WhitePixel(dpy, screen)), "%d");
debug(XSetLineAttributes(dpy, gc, 2, LineSolid, CapButt, JoinBevel),
"%d");
debug(XSetFillStyle(dpy, gc, FillSolid), "%d");
debug(XSync(dpy, False), "%d");
debug(XDrawLine(dpy, window, gc, width / 2, 0, width / 2, height),
"%d");
debug(XSync(dpy, False), "%d");
debug(XSetForeground(dpy, gc, WhitePixel(dpy, screen)), "%d");
debug(XSetBackground(dpy, gc, BlackPixel(dpy, screen)), "%d");
debug(XSetLineAttributes(dpy, gc, 2, LineSolid, CapButt, JoinBevel),
"%d");
debug(XSetFillStyle(dpy, gc, FillSolid), "%d");
debug(XSync(dpy, False), "%d");
debug(XDrawLine(dpy, window, gc, 0, height / 2, width, height / 2),
"%d");
debug(XFlush(dpy), "%d");
sleep(10);
XCloseDisplay(dpy);
return (0);
}
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