nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <string.h>
nuclear@0: #include <ctype.h>
nuclear@0: #include <X11/Xlib.h>
nuclear@0: 
nuclear@0: #ifdef USE_XRANDR
nuclear@0: #include <X11/extensions/Xrandr.h>
nuclear@0: 
nuclear@0: char *randr_err_msg[] = {
nuclear@0: 	"RRSetConfigSuccess",
nuclear@0: 	"RRSetConfigInvalidConfigTime",
nuclear@0: 	"RRSetConfigInvalidTime",
nuclear@0: 	"RRSetConfigFailed"
nuclear@0: };
nuclear@0: #endif
nuclear@0: 
nuclear@0: #ifdef USE_XF86VM
nuclear@0: #include <X11/extensions/xf86vmode.h>
nuclear@0: #endif
nuclear@0: 
nuclear@0: int get_size(Display *dpy, int scr, int *xsz, int *ysz);
nuclear@0: int set_size(Display *dpy, int scr, int xsz, int ysz);
nuclear@0: 
nuclear@0: const char *usage = "usage: %s [options]\n"
nuclear@0: 	"options:\n"
nuclear@0: 	"  -s <w>x<h>   set specified screen size\n"
nuclear@0: 	"  -f           force size change without current size detection\n"
nuclear@0: 	"  -h           this usage information\n";
nuclear@0: 
nuclear@0: int use_xrandr = 1;
nuclear@0: int use_xf86vm = 1;
nuclear@0: 
nuclear@0: int main(int argc, char **argv)
nuclear@0: {
nuclear@0: 	int i, cur_xres, cur_yres, xres = -1, yres = -1;
nuclear@0: 	int force = 0;
nuclear@0: 	Display *dpy;
nuclear@0: 	int scr;
nuclear@0: 
nuclear@0: 	for(i=1; i<argc; i++) {
nuclear@0: 		if(argv[i][0] == '-' && (argv[i][2] == 0 || argv[i][1] == '-')) {
nuclear@0: 			char *sep;
nuclear@0: 
nuclear@0: 			switch(argv[i][1]) {
nuclear@0: 			case 's':
nuclear@0: 				if(!isdigit(argv[++i][0]) || !(sep = strchr(argv[i], 'x')) || !isdigit(*(sep + 1))) {
nuclear@0: 					fputs("-s must be followed by something like \"640x480\"\n", stderr);
nuclear@0: 					return EXIT_FAILURE;
nuclear@0: 				}
nuclear@0: 				xres = atoi(argv[i]);
nuclear@0: 				yres = atoi(sep + 1);
nuclear@0: 				break;
nuclear@0: 
nuclear@0: 			case 'f':
nuclear@0: 				force = 1;
nuclear@0: 				break;
nuclear@0: 
nuclear@0: 			case 'h':
nuclear@0: 				printf(usage, argv[0]);
nuclear@0: 				return 0;
nuclear@0: 
nuclear@0: 			case '-':
nuclear@0: 				if(strcmp(argv[i], "--no-xrandr") == 0) {
nuclear@0: 					use_xrandr = 0;
nuclear@0: 					break;
nuclear@0: 				} else if(strcmp(argv[i], "--no-xf86vm") == 0) {
nuclear@0: 					use_xf86vm = 0;
nuclear@0: 					break;
nuclear@0: 				}
nuclear@0: 				/* fallthrough to invalid arg */
nuclear@0: 			default:
nuclear@0: 				fprintf(stderr, "unrecognized option: %s, try -h for usage\n", argv[i]);
nuclear@0: 				return 1;
nuclear@0: 			}
nuclear@0: 		} else {
nuclear@0: 			fprintf(stderr, "unexpected argument: %s\n", argv[i]);
nuclear@0: 			return 1;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(!(dpy = XOpenDisplay(0))) {
nuclear@0: 		fprintf(stderr, "failed to connect to the X server\n");
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	scr = DefaultScreen(dpy);
nuclear@0: 
nuclear@0: 	if(get_size(dpy, scr, &cur_xres, &cur_yres) == -1) {
nuclear@0: 		fprintf(stderr, "failed to retreive current screen size\n");
nuclear@0: 		XCloseDisplay(dpy);
nuclear@0: 		return 1;
nuclear@0: 	}
nuclear@0: 	printf("current size: %dx%d\n", cur_xres, cur_yres);
nuclear@0: 
nuclear@0: 	if(xres != -1) {	/* size change requested */
nuclear@0: 		if(xres != cur_xres || yres != cur_yres || force) {
nuclear@0: 			if(set_size(dpy, scr, xres, yres) == -1) {
nuclear@0: 				fprintf(stderr, "set_size failed\n");
nuclear@0: 				XCloseDisplay(dpy);
nuclear@0: 				return 1;
nuclear@0: 			}
nuclear@0: 			printf("size updated sucessfully\n");
nuclear@0: 		} else {
nuclear@0: 			printf("already at requested size! do nothing (use -f to force change).\n");
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: 	XCloseDisplay(dpy);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: int get_size(Display *dpy, int scr, int *xsz, int *ysz)
nuclear@0: {
nuclear@0: 	Window root;
nuclear@0: 	int event_base, error_base;
nuclear@0: 
nuclear@0: 	scr = DefaultScreen(dpy);
nuclear@0: 	root = RootWindow(dpy, scr);
nuclear@0: 
nuclear@0: 	/* first try r&r */
nuclear@0: #ifdef USE_XRANDR
nuclear@0: 	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
nuclear@0: 		XRRScreenConfiguration *xrr_config;
nuclear@0: 		XRRScreenSize *ssizes;
nuclear@0: 		Rotation rot;
nuclear@0: 		int ssize_count, curr;
nuclear@0: 
nuclear@0: 		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
nuclear@0: 			fprintf(stderr, "failed to retrieve screen configuration\n");
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
nuclear@0: 		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
nuclear@0: 
nuclear@0: 		*xsz = ssizes[curr].width;
nuclear@0: 		*ysz = ssizes[curr].height;
nuclear@0: 
nuclear@0: 		XRRFreeScreenConfigInfo(xrr_config);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: #endif
nuclear@0: 
nuclear@0: 	/* then try xf86vm */
nuclear@0: #ifdef USE_XF86VM
nuclear@0: 	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
nuclear@0: 		XF86VidModeModeLine modeline;
nuclear@0: 		int dot_clock;
nuclear@0: 
nuclear@0: 		if(!XF86VidModeGetModeLine(dpy, scr, &dot_clock, &modeline)) {
nuclear@0: 			fprintf(stderr, "failed to get current video mode\n");
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		*xsz = modeline.hdisplay;
nuclear@0: 		*ysz = modeline.vdisplay;
nuclear@0: 
nuclear@0: 		if(modeline.privsize) {
nuclear@0: 			XFree(modeline.private);
nuclear@0: 		}
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: #endif
nuclear@0: 
nuclear@0: 	fprintf(stderr, "can't get any size information\n");
nuclear@0: 	return -1;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: int set_size(Display *dpy, int scr, int xsz, int ysz)
nuclear@0: {
nuclear@0: 	int i, event_base, error_base;
nuclear@0: 	Window root;
nuclear@0: 
nuclear@0: 	root = RootWindow(dpy, scr);
nuclear@0: 
nuclear@0: 	/* first try r&r */
nuclear@0: #ifdef USE_XRANDR
nuclear@0: 	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
nuclear@0: 		Status st;
nuclear@0: 		XRRScreenConfiguration *xrr_config;
nuclear@0: 		XRRScreenSize *ssizes;
nuclear@0: 		Rotation rot;
nuclear@0: 		int ssize_count, curr;
nuclear@0: 		Time timestamp, cfg_timestamp;
nuclear@0: 
nuclear@0: 		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
nuclear@0: 			fprintf(stderr, "failed to retrieve screen configuration\n");
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
nuclear@0: 		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
nuclear@0: 		timestamp = XRRConfigTimes(xrr_config, &cfg_timestamp);
nuclear@0: 
nuclear@0: 		if(xsz == ssizes[curr].width && ysz == ssizes[curr].height) {
nuclear@0: 			XRRFreeScreenConfigInfo(xrr_config);
nuclear@0: 			return 0;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		for(i=0; i<ssize_count; i++) {
nuclear@0: 			if(ssizes[i].width == xsz && ssizes[i].height == ysz) {
nuclear@0: 				break;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 		if(i == ssize_count) {
nuclear@0: 			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
nuclear@0: 			XRRFreeScreenConfigInfo(xrr_config);
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if((st = XRRSetScreenConfig(dpy, xrr_config, root, i, rot, timestamp)) != 0) {
nuclear@0: 			fprintf(stderr, "failed to set resolution with r-and-r, error: %d (%s)\n", st, randr_err_msg[st]);
nuclear@0: 			XRRFreeScreenConfigInfo(xrr_config);
nuclear@0: #ifdef USE_XF86VM
nuclear@0: 			printf("retrying with xf86vm...\n");
nuclear@0: 			goto retry_with_xf86vm;
nuclear@0: #endif
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		XRRFreeScreenConfigInfo(xrr_config);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: #endif
nuclear@0: 
nuclear@0: 	/*try xf86vm */
nuclear@0: #ifdef USE_XF86VM
nuclear@0: retry_with_xf86vm:
nuclear@0: 	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
nuclear@0: 		XF86VidModeModeInfo **modes;
nuclear@0: 		int mode_count;
nuclear@0: 
nuclear@0: 		if(!XF86VidModeGetAllModeLines(dpy, scr, &mode_count, &modes)) {
nuclear@0: 			fprintf(stderr, "failed to get list of available video modes\n");
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		for(i=0; i<mode_count; i++) {
nuclear@0: 			if(modes[i]->hdisplay == xsz && modes[i]->vdisplay == ysz) {
nuclear@0: 				break;
nuclear@0: 			}
nuclear@0: 		}
nuclear@0: 		if(i == mode_count) {
nuclear@0: 			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
nuclear@0: 			XFree(modes);
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 
nuclear@0: 		if(!XF86VidModeSwitchToMode(dpy, scr, modes[i])) {
nuclear@0: 			fprintf(stderr, "failed to set requested size with xf86vm\n");
nuclear@0: 			XFree(modes);
nuclear@0: 			return -1;
nuclear@0: 		}
nuclear@0: 		XF86VidModeSetViewPort(dpy, scr, 0, 0);
nuclear@0: 
nuclear@0: 		XFree(modes);
nuclear@0: 		return 0;
nuclear@0: 	}
nuclear@0: #endif
nuclear@0: 
nuclear@0: 	fprintf(stderr, "not possible to change display size\n");
nuclear@0: 	return -1;
nuclear@0: }