/* 
	Remember to compile try:
		1) gcc hi.c -o hi -lX11
		2) gcc hi.c -I /usr/include/X11 -L /usr/X11/lib -lX11
		3) gcc hi.c -I /where/ever -L /who/knows/where -l X11

	Brian Hammond 2/9/96.    Feel free to do with this as you will!
*/


/* include the X library headers */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>

/* include some silly stuff */
#include <stdio.h>
#include <stdlib.h>

/* here are our X variables */
Display *dis;
int screen;
Window win;
GC gc;
int width=320;
int height=240;

/* here are our X routines declared! */
void init_x();
void close_x();
void redraw();

main () {
	XEvent event;		/* the XEvent declaration !!! */
	KeySym key;		/* a dealie-bob to handle KeyPress Events */	
	char text[255];		/* a char buffer for KeyPress Events */
	Pixmap pmap;
	XColor col;

	init_x();

	printf("Patte de canard\n");
	Colormap cmap = DefaultColormap(dis, DefaultScreen(dis));
	printf("?\n");
	pmap = XCreatePixmap(dis, win, width, height, DefaultDepth(dis, DefaultScreen(dis)));


	FILE* home = NULL;
	char buffer[4];
	home = fopen("home.bmp", "r");
	if(home == NULL)
		return 0;

	fseek(home, 0x0A, SEEK_SET);
	buffer[0] = getc(home);
	buffer[1] = getc(home);
	buffer[2] = getc(home);
	buffer[3] = getc(home);
	printf("Pixel array offset %02x %02x %02x %02x\n", buffer[0], buffer[1], buffer[2], buffer[3]);

	fseek(home, 0x12, SEEK_SET);
        buffer[0] = getc(home);
        buffer[1] = getc(home);
        buffer[2] = getc(home);
        buffer[3] = getc(home);
        printf("Width %02x %02x %02x %02x\n", buffer[0], buffer[1], buffer[2], buffer[3]);

	//fseek(home, 0x12, SEEK_SET);
        buffer[0] = getc(home);
        buffer[1] = getc(home);
        buffer[2] = getc(home);
        buffer[3] = getc(home);
        printf("Height %02x %02x %02x %02x\n", buffer[0], buffer[1], buffer[2], buffer[3]);

	fseek(home, 0x1C, SEEK_SET);
        buffer[0] = getc(home);
        buffer[1] = getc(home);
        printf("Bits Per Pixel %02x %02x\n", buffer[0], buffer[1]);

	if(buffer[1] != 0 || buffer[0] != 0x18)
	{
		printf("Could not read BMP\n");
		return 1;
	}




	while(1);


	/* look for events forever... */
	while(1) {		
		/* get the next event and stuff it into our event variable.
		   Note:  only events we set the mask for are detected!
		*/
		XNextEvent(dis, &event);
	
		if (event.type==Expose && event.xexpose.count==0) {
		/* the window was exposed redraw it! */
			redraw();
		}
		if (event.type==KeyPress&&
		    XLookupString(&event.xkey,text,255,&key,0)==1) {
		/* use the XLookupString routine to convert the invent
		   KeyPress data into regular text.  Weird but necessary...
		*/
			if (text[0]=='q') {
				close_x();
			}
			printf("You pressed the %c key!\n",text[0]);
		}
		if (event.type==ButtonPress) {
		/* tell where the mouse Button was Pressed */
			int x=event.xbutton.x,
			    y=event.xbutton.y;

			//strcpy(text,"X is FUN!");
			//XSetForeground(dis,gc,rand()%event.xbutton.x%255);
			//XDrawString(dis,win,gc,x,y, text, strlen(text));


			col.red = 128;
			col.green = 128;
			col.blue = 0;
			XAllocColor(dis, cmap, &col);
			XSetForeground(dis, gc, col.pixel);
			XDrawPoint(dis,win,gc,x,y);
		}
	}
}

void init_x() {
/* get the colors black and white (see section for details) */        
	unsigned long black,white;

	dis=XOpenDisplay((char *)0);
   	screen=DefaultScreen(dis);
	black=BlackPixel(dis,screen),
	white=WhitePixel(dis, screen);
   	win=XCreateSimpleWindow(dis,DefaultRootWindow(dis),0,0,height,width, 0,black, white);
	XSetStandardProperties(dis,win,"Howdy","Hi",None,NULL,0,NULL);
	XSelectInput(dis, win, ExposureMask|ButtonPressMask|KeyPressMask);
        gc=XCreateGC(dis, win, 0,0);        
	XSetBackground(dis,gc,white);
	XSetForeground(dis,gc,black);
	XClearWindow(dis, win);
	XMapRaised(dis, win);
};

void close_x() {
	XFreeGC(dis, gc);
	XDestroyWindow(dis,win);
	XCloseDisplay(dis);	
	exit(1);				
};

void redraw() {
	XClearWindow(dis, win);
};