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/* Based on xqcam.c by Paul Chinn <loomer@svpal.org> */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/time.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
XShmSegmentInfo XJ_SHMInfo;
Screen *XJ_screen;
Display *XJ_disp;
Window XJ_root,XJ_win;
XImage *XJ_ximage;
XEvent XJ_ev;
GC XJ_gc;
int XJ_screen_num;
unsigned long XJ_white,XJ_black;
int XJ_started=0;
int XJ_depth;
int XJ_caught_error;
int XJ_width, XJ_height;
int *XJ_greys;
int XJ_error_catcher(Display * d, XErrorEvent * xeev)
{
++XJ_caught_error;
return 0;
}
char *XJ_init(int width, int height, char *window_name, char *icon_name)
{
XGCValues values;
XSizeHints hints;
XWMHints wmhints;
char *sbuf;
XTextProperty windowName, iconName;
int (*old_handler)();
int i;
XColor col;
XJ_width=width;
XJ_height=height;
XJ_disp=XOpenDisplay(NULL);
if(!XJ_disp) {printf("open display failed\n"); return NULL;}
XJ_screen=DefaultScreenOfDisplay(XJ_disp);
XJ_screen_num=DefaultScreen(XJ_disp);
XJ_white=XWhitePixel(XJ_disp,XJ_screen_num);
XJ_black=XBlackPixel(XJ_disp,XJ_screen_num);
XJ_root=DefaultRootWindow(XJ_disp);
XJ_win=XCreateSimpleWindow(XJ_disp,XJ_root,0,0,XJ_width,XJ_height,0,XJ_white,XJ_black);
if(!XJ_win) {
printf("create window failed\n");
return(NULL);
}
/* tell window manager about our window */
hints.flags=PSize|PMaxSize|PMinSize;
hints.min_width=hints.max_width=hints.width=XJ_width;
hints.min_height=hints.max_height=hints.height=XJ_height;
wmhints.input=True;
wmhints.flags=InputHint;
XStringListToTextProperty(&window_name, 1 ,&windowName);
XStringListToTextProperty(&icon_name, 1 ,&iconName);
XSetWMProperties(XJ_disp, XJ_win,
&windowName, &iconName,
NULL, 0,
&hints, &wmhints, NULL);
XSelectInput(XJ_disp, XJ_win, ExposureMask);
XMapRaised(XJ_disp, XJ_win);
XNextEvent(XJ_disp, &XJ_ev);
XJ_gc = XCreateGC(XJ_disp, XJ_win, 0, &values);
old_handler = XSetErrorHandler(XJ_error_catcher);
XSync(XJ_disp, 0);
XJ_depth = DefaultDepthOfScreen(XJ_screen);
XJ_ximage = XShmCreateImage(XJ_disp, DefaultVisual(XJ_disp, XJ_screen_num),
XJ_depth, ZPixmap, NULL, &XJ_SHMInfo, XJ_width, XJ_height);
if(!XJ_ximage) {
printf("CreateImage Failed\n");
return(NULL);
}
XJ_SHMInfo.shmid=shmget(IPC_PRIVATE,
XJ_ximage->bytes_per_line*XJ_ximage->height,
IPC_CREAT|0777);
if(XJ_SHMInfo.shmid < 0) {
perror("shmget failed:");
return (NULL);
}
sbuf = XJ_ximage->data = XJ_SHMInfo.shmaddr = shmat(XJ_SHMInfo.shmid, 0, 0);
XShmAttach(XJ_disp, &XJ_SHMInfo);
XSync(XJ_disp, 0);
XSetErrorHandler(old_handler);
if (XJ_caught_error) {
fprintf(stderr, "Shared memory unavailable, using regular images\n");
shmdt(XJ_SHMInfo.shmaddr);
XJ_SHMInfo.shmaddr = 0;
sbuf = malloc(((XJ_depth + 7) / 8) * XJ_width * XJ_height);
XJ_ximage = XCreateImage(XJ_disp, DefaultVisual(XJ_disp, XJ_screen_num),
XJ_depth, ZPixmap, 0, sbuf, XJ_width, XJ_height, XJ_depth,
XJ_width * ((XJ_depth + 7) / 8));
if(!XJ_ximage) {
printf("CreateImage Failed\n");
return(NULL);
}
}
XJ_greys=(int *)malloc(sizeof(int)*256);
for(i=0; i<256; i++)
{
col.red =col.green = col.blue = i * 256;
if (!XAllocColor(XJ_disp, DefaultColormap(XJ_disp, XJ_screen_num), &col))
fprintf(stderr,"XAllocColor failed on %d\n",i);
XJ_greys[i] = col.pixel;
}
XJ_started=1;
return(sbuf);
}
void XJ_exit(void)
{
if(XJ_started) {
if (XJ_ximage)
XDestroyImage(XJ_ximage);
XShmDetach(XJ_disp, &XJ_SHMInfo);
if(XJ_SHMInfo.shmaddr)
shmdt(XJ_SHMInfo.shmaddr);
if(XJ_SHMInfo.shmid > 0)
shmctl(XJ_SHMInfo.shmid, IPC_RMID, 0);
}
}
void XJ_show(void)
{
if (XJ_SHMInfo.shmaddr)
{
XShmPutImage(XJ_disp, XJ_win, XJ_gc, XJ_ximage, 0, 0, 0, 0, XJ_width, XJ_height, False);
} else
{
XPutImage(XJ_disp, XJ_win, XJ_gc, XJ_ximage, 0, 0, 0, 0, XJ_width, XJ_height);
}
XFlush(XJ_disp);
}
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