1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/xresize.c	Thu Mar 10 14:58:46 2011 +0200
     1.3 @@ -0,0 +1,261 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <string.h>
     1.7 +#include <ctype.h>
     1.8 +#include <X11/Xlib.h>
     1.9 +
    1.10 +#ifdef USE_XRANDR
    1.11 +#include <X11/extensions/Xrandr.h>
    1.12 +
    1.13 +char *randr_err_msg[] = {
    1.14 +	"RRSetConfigSuccess",
    1.15 +	"RRSetConfigInvalidConfigTime",
    1.16 +	"RRSetConfigInvalidTime",
    1.17 +	"RRSetConfigFailed"
    1.18 +};
    1.19 +#endif
    1.20 +
    1.21 +#ifdef USE_XF86VM
    1.22 +#include <X11/extensions/xf86vmode.h>
    1.23 +#endif
    1.24 +
    1.25 +int get_size(Display *dpy, int scr, int *xsz, int *ysz);
    1.26 +int set_size(Display *dpy, int scr, int xsz, int ysz);
    1.27 +
    1.28 +const char *usage = "usage: %s [options]\n"
    1.29 +	"options:\n"
    1.30 +	"  -s <w>x<h>   set specified screen size\n"
    1.31 +	"  -f           force size change without current size detection\n"
    1.32 +	"  -h           this usage information\n";
    1.33 +
    1.34 +int use_xrandr = 1;
    1.35 +int use_xf86vm = 1;
    1.36 +
    1.37 +int main(int argc, char **argv)
    1.38 +{
    1.39 +	int i, cur_xres, cur_yres, xres = -1, yres = -1;
    1.40 +	int force = 0;
    1.41 +	Display *dpy;
    1.42 +	int scr;
    1.43 +
    1.44 +	for(i=1; i<argc; i++) {
    1.45 +		if(argv[i][0] == '-' && (argv[i][2] == 0 || argv[i][1] == '-')) {
    1.46 +			char *sep;
    1.47 +
    1.48 +			switch(argv[i][1]) {
    1.49 +			case 's':
    1.50 +				if(!isdigit(argv[++i][0]) || !(sep = strchr(argv[i], 'x')) || !isdigit(*(sep + 1))) {
    1.51 +					fputs("-s must be followed by something like \"640x480\"\n", stderr);
    1.52 +					return EXIT_FAILURE;
    1.53 +				}
    1.54 +				xres = atoi(argv[i]);
    1.55 +				yres = atoi(sep + 1);
    1.56 +				break;
    1.57 +
    1.58 +			case 'f':
    1.59 +				force = 1;
    1.60 +				break;
    1.61 +
    1.62 +			case 'h':
    1.63 +				printf(usage, argv[0]);
    1.64 +				return 0;
    1.65 +
    1.66 +			case '-':
    1.67 +				if(strcmp(argv[i], "--no-xrandr") == 0) {
    1.68 +					use_xrandr = 0;
    1.69 +					break;
    1.70 +				} else if(strcmp(argv[i], "--no-xf86vm") == 0) {
    1.71 +					use_xf86vm = 0;
    1.72 +					break;
    1.73 +				}
    1.74 +				/* fallthrough to invalid arg */
    1.75 +			default:
    1.76 +				fprintf(stderr, "unrecognized option: %s, try -h for usage\n", argv[i]);
    1.77 +				return 1;
    1.78 +			}
    1.79 +		} else {
    1.80 +			fprintf(stderr, "unexpected argument: %s\n", argv[i]);
    1.81 +			return 1;
    1.82 +		}
    1.83 +	}
    1.84 +
    1.85 +	if(!(dpy = XOpenDisplay(0))) {
    1.86 +		fprintf(stderr, "failed to connect to the X server\n");
    1.87 +		return 1;
    1.88 +	}
    1.89 +	scr = DefaultScreen(dpy);
    1.90 +
    1.91 +	if(get_size(dpy, scr, &cur_xres, &cur_yres) == -1) {
    1.92 +		fprintf(stderr, "failed to retreive current screen size\n");
    1.93 +		XCloseDisplay(dpy);
    1.94 +		return 1;
    1.95 +	}
    1.96 +	printf("current size: %dx%d\n", cur_xres, cur_yres);
    1.97 +
    1.98 +	if(xres != -1) {	/* size change requested */
    1.99 +		if(xres != cur_xres || yres != cur_yres || force) {
   1.100 +			if(set_size(dpy, scr, xres, yres) == -1) {
   1.101 +				fprintf(stderr, "set_size failed\n");
   1.102 +				XCloseDisplay(dpy);
   1.103 +				return 1;
   1.104 +			}
   1.105 +			printf("size updated sucessfully\n");
   1.106 +		} else {
   1.107 +			printf("already at requested size! do nothing (use -f to force change).\n");
   1.108 +		}
   1.109 +	}
   1.110 +	XCloseDisplay(dpy);
   1.111 +	return 0;
   1.112 +}
   1.113 +
   1.114 +int get_size(Display *dpy, int scr, int *xsz, int *ysz)
   1.115 +{
   1.116 +	Window root;
   1.117 +	int event_base, error_base;
   1.118 +
   1.119 +	scr = DefaultScreen(dpy);
   1.120 +	root = RootWindow(dpy, scr);
   1.121 +
   1.122 +	/* first try r&r */
   1.123 +#ifdef USE_XRANDR
   1.124 +	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
   1.125 +		XRRScreenConfiguration *xrr_config;
   1.126 +		XRRScreenSize *ssizes;
   1.127 +		Rotation rot;
   1.128 +		int ssize_count, curr;
   1.129 +
   1.130 +		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
   1.131 +			fprintf(stderr, "failed to retrieve screen configuration\n");
   1.132 +			return -1;
   1.133 +		}
   1.134 +		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
   1.135 +		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
   1.136 +
   1.137 +		*xsz = ssizes[curr].width;
   1.138 +		*ysz = ssizes[curr].height;
   1.139 +
   1.140 +		XRRFreeScreenConfigInfo(xrr_config);
   1.141 +		return 0;
   1.142 +	}
   1.143 +#endif
   1.144 +
   1.145 +	/* then try xf86vm */
   1.146 +#ifdef USE_XF86VM
   1.147 +	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
   1.148 +		XF86VidModeModeLine modeline;
   1.149 +		int dot_clock;
   1.150 +
   1.151 +		if(!XF86VidModeGetModeLine(dpy, scr, &dot_clock, &modeline)) {
   1.152 +			fprintf(stderr, "failed to get current video mode\n");
   1.153 +			return -1;
   1.154 +		}
   1.155 +
   1.156 +		*xsz = modeline.hdisplay;
   1.157 +		*ysz = modeline.vdisplay;
   1.158 +
   1.159 +		if(modeline.privsize) {
   1.160 +			XFree(modeline.private);
   1.161 +		}
   1.162 +		return 0;
   1.163 +	}
   1.164 +#endif
   1.165 +
   1.166 +	fprintf(stderr, "can't get any size information\n");
   1.167 +	return -1;
   1.168 +}
   1.169 +
   1.170 +
   1.171 +int set_size(Display *dpy, int scr, int xsz, int ysz)
   1.172 +{
   1.173 +	int i, event_base, error_base;
   1.174 +	Window root;
   1.175 +
   1.176 +	root = RootWindow(dpy, scr);
   1.177 +
   1.178 +	/* first try r&r */
   1.179 +#ifdef USE_XRANDR
   1.180 +	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
   1.181 +		Status st;
   1.182 +		XRRScreenConfiguration *xrr_config;
   1.183 +		XRRScreenSize *ssizes;
   1.184 +		Rotation rot;
   1.185 +		int ssize_count, curr;
   1.186 +		Time timestamp, cfg_timestamp;
   1.187 +
   1.188 +		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
   1.189 +			fprintf(stderr, "failed to retrieve screen configuration\n");
   1.190 +			return -1;
   1.191 +		}
   1.192 +		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
   1.193 +		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
   1.194 +		timestamp = XRRConfigTimes(xrr_config, &cfg_timestamp);
   1.195 +
   1.196 +		if(xsz == ssizes[curr].width && ysz == ssizes[curr].height) {
   1.197 +			XRRFreeScreenConfigInfo(xrr_config);
   1.198 +			return 0;
   1.199 +		}
   1.200 +
   1.201 +		for(i=0; i<ssize_count; i++) {
   1.202 +			if(ssizes[i].width == xsz && ssizes[i].height == ysz) {
   1.203 +				break;
   1.204 +			}
   1.205 +		}
   1.206 +		if(i == ssize_count) {
   1.207 +			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
   1.208 +			XRRFreeScreenConfigInfo(xrr_config);
   1.209 +			return -1;
   1.210 +		}
   1.211 +
   1.212 +		if((st = XRRSetScreenConfig(dpy, xrr_config, root, i, rot, timestamp)) != 0) {
   1.213 +			fprintf(stderr, "failed to set resolution with r-and-r, error: %d (%s)\n", st, randr_err_msg[st]);
   1.214 +			XRRFreeScreenConfigInfo(xrr_config);
   1.215 +#ifdef USE_XF86VM
   1.216 +			printf("retrying with xf86vm...\n");
   1.217 +			goto retry_with_xf86vm;
   1.218 +#endif
   1.219 +			return -1;
   1.220 +		}
   1.221 +
   1.222 +		XRRFreeScreenConfigInfo(xrr_config);
   1.223 +		return 0;
   1.224 +	}
   1.225 +#endif
   1.226 +
   1.227 +	/*try xf86vm */
   1.228 +#ifdef USE_XF86VM
   1.229 +retry_with_xf86vm:
   1.230 +	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
   1.231 +		XF86VidModeModeInfo **modes;
   1.232 +		int mode_count;
   1.233 +
   1.234 +		if(!XF86VidModeGetAllModeLines(dpy, scr, &mode_count, &modes)) {
   1.235 +			fprintf(stderr, "failed to get list of available video modes\n");
   1.236 +			return -1;
   1.237 +		}
   1.238 +
   1.239 +		for(i=0; i<mode_count; i++) {
   1.240 +			if(modes[i]->hdisplay == xsz && modes[i]->vdisplay == ysz) {
   1.241 +				break;
   1.242 +			}
   1.243 +		}
   1.244 +		if(i == mode_count) {
   1.245 +			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
   1.246 +			XFree(modes);
   1.247 +			return -1;
   1.248 +		}
   1.249 +
   1.250 +		if(!XF86VidModeSwitchToMode(dpy, scr, modes[i])) {
   1.251 +			fprintf(stderr, "failed to set requested size with xf86vm\n");
   1.252 +			XFree(modes);
   1.253 +			return -1;
   1.254 +		}
   1.255 +		XF86VidModeSetViewPort(dpy, scr, 0, 0);
   1.256 +
   1.257 +		XFree(modes);
   1.258 +		return 0;
   1.259 +	}
   1.260 +#endif
   1.261 +
   1.262 +	fprintf(stderr, "not possible to change display size\n");
   1.263 +	return -1;
   1.264 +}