# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1299761926 -7200
# Node ID 8555f3aabbc79d09c4679b0b859a9abd1e34b761

created hg repository for xresize, useful little bugger

diff -r 000000000000 -r 8555f3aabbc7 Makefile
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Makefile	Thu Mar 10 14:58:46 2011 +0200
@@ -0,0 +1,13 @@
+obj = xresize.o
+bin = xresize
+
+CC = gcc
+CFLAGS = -pedantic -Wall -g -I/usr/X11R6/include -DUSE_XRANDR -DUSE_XF86VM
+LDFLAGS = -L/usr/X11R6/lib -lX11 -lXrandr -lXxf86vm
+
+$(bin): $(obj)
+	$(CC) -o $@ $(obj) $(LDFLAGS)
+
+.PHONY: clean
+clean:
+	rm -f $(obj) $(bin)
diff -r 000000000000 -r 8555f3aabbc7 xresize.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xresize.c	Thu Mar 10 14:58:46 2011 +0200
@@ -0,0 +1,261 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <X11/Xlib.h>
+
+#ifdef USE_XRANDR
+#include <X11/extensions/Xrandr.h>
+
+char *randr_err_msg[] = {
+	"RRSetConfigSuccess",
+	"RRSetConfigInvalidConfigTime",
+	"RRSetConfigInvalidTime",
+	"RRSetConfigFailed"
+};
+#endif
+
+#ifdef USE_XF86VM
+#include <X11/extensions/xf86vmode.h>
+#endif
+
+int get_size(Display *dpy, int scr, int *xsz, int *ysz);
+int set_size(Display *dpy, int scr, int xsz, int ysz);
+
+const char *usage = "usage: %s [options]\n"
+	"options:\n"
+	"  -s <w>x<h>   set specified screen size\n"
+	"  -f           force size change without current size detection\n"
+	"  -h           this usage information\n";
+
+int use_xrandr = 1;
+int use_xf86vm = 1;
+
+int main(int argc, char **argv)
+{
+	int i, cur_xres, cur_yres, xres = -1, yres = -1;
+	int force = 0;
+	Display *dpy;
+	int scr;
+
+	for(i=1; i<argc; i++) {
+		if(argv[i][0] == '-' && (argv[i][2] == 0 || argv[i][1] == '-')) {
+			char *sep;
+
+			switch(argv[i][1]) {
+			case 's':
+				if(!isdigit(argv[++i][0]) || !(sep = strchr(argv[i], 'x')) || !isdigit(*(sep + 1))) {
+					fputs("-s must be followed by something like \"640x480\"\n", stderr);
+					return EXIT_FAILURE;
+				}
+				xres = atoi(argv[i]);
+				yres = atoi(sep + 1);
+				break;
+
+			case 'f':
+				force = 1;
+				break;
+
+			case 'h':
+				printf(usage, argv[0]);
+				return 0;
+
+			case '-':
+				if(strcmp(argv[i], "--no-xrandr") == 0) {
+					use_xrandr = 0;
+					break;
+				} else if(strcmp(argv[i], "--no-xf86vm") == 0) {
+					use_xf86vm = 0;
+					break;
+				}
+				/* fallthrough to invalid arg */
+			default:
+				fprintf(stderr, "unrecognized option: %s, try -h for usage\n", argv[i]);
+				return 1;
+			}
+		} else {
+			fprintf(stderr, "unexpected argument: %s\n", argv[i]);
+			return 1;
+		}
+	}
+
+	if(!(dpy = XOpenDisplay(0))) {
+		fprintf(stderr, "failed to connect to the X server\n");
+		return 1;
+	}
+	scr = DefaultScreen(dpy);
+
+	if(get_size(dpy, scr, &cur_xres, &cur_yres) == -1) {
+		fprintf(stderr, "failed to retreive current screen size\n");
+		XCloseDisplay(dpy);
+		return 1;
+	}
+	printf("current size: %dx%d\n", cur_xres, cur_yres);
+
+	if(xres != -1) {	/* size change requested */
+		if(xres != cur_xres || yres != cur_yres || force) {
+			if(set_size(dpy, scr, xres, yres) == -1) {
+				fprintf(stderr, "set_size failed\n");
+				XCloseDisplay(dpy);
+				return 1;
+			}
+			printf("size updated sucessfully\n");
+		} else {
+			printf("already at requested size! do nothing (use -f to force change).\n");
+		}
+	}
+	XCloseDisplay(dpy);
+	return 0;
+}
+
+int get_size(Display *dpy, int scr, int *xsz, int *ysz)
+{
+	Window root;
+	int event_base, error_base;
+
+	scr = DefaultScreen(dpy);
+	root = RootWindow(dpy, scr);
+
+	/* first try r&r */
+#ifdef USE_XRANDR
+	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
+		XRRScreenConfiguration *xrr_config;
+		XRRScreenSize *ssizes;
+		Rotation rot;
+		int ssize_count, curr;
+
+		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
+			fprintf(stderr, "failed to retrieve screen configuration\n");
+			return -1;
+		}
+		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
+		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
+
+		*xsz = ssizes[curr].width;
+		*ysz = ssizes[curr].height;
+
+		XRRFreeScreenConfigInfo(xrr_config);
+		return 0;
+	}
+#endif
+
+	/* then try xf86vm */
+#ifdef USE_XF86VM
+	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
+		XF86VidModeModeLine modeline;
+		int dot_clock;
+
+		if(!XF86VidModeGetModeLine(dpy, scr, &dot_clock, &modeline)) {
+			fprintf(stderr, "failed to get current video mode\n");
+			return -1;
+		}
+
+		*xsz = modeline.hdisplay;
+		*ysz = modeline.vdisplay;
+
+		if(modeline.privsize) {
+			XFree(modeline.private);
+		}
+		return 0;
+	}
+#endif
+
+	fprintf(stderr, "can't get any size information\n");
+	return -1;
+}
+
+
+int set_size(Display *dpy, int scr, int xsz, int ysz)
+{
+	int i, event_base, error_base;
+	Window root;
+
+	root = RootWindow(dpy, scr);
+
+	/* first try r&r */
+#ifdef USE_XRANDR
+	if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
+		Status st;
+		XRRScreenConfiguration *xrr_config;
+		XRRScreenSize *ssizes;
+		Rotation rot;
+		int ssize_count, curr;
+		Time timestamp, cfg_timestamp;
+
+		if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
+			fprintf(stderr, "failed to retrieve screen configuration\n");
+			return -1;
+		}
+		ssizes = XRRConfigSizes(xrr_config, &ssize_count);
+		curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
+		timestamp = XRRConfigTimes(xrr_config, &cfg_timestamp);
+
+		if(xsz == ssizes[curr].width && ysz == ssizes[curr].height) {
+			XRRFreeScreenConfigInfo(xrr_config);
+			return 0;
+		}
+
+		for(i=0; i<ssize_count; i++) {
+			if(ssizes[i].width == xsz && ssizes[i].height == ysz) {
+				break;
+			}
+		}
+		if(i == ssize_count) {
+			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
+			XRRFreeScreenConfigInfo(xrr_config);
+			return -1;
+		}
+
+		if((st = XRRSetScreenConfig(dpy, xrr_config, root, i, rot, timestamp)) != 0) {
+			fprintf(stderr, "failed to set resolution with r-and-r, error: %d (%s)\n", st, randr_err_msg[st]);
+			XRRFreeScreenConfigInfo(xrr_config);
+#ifdef USE_XF86VM
+			printf("retrying with xf86vm...\n");
+			goto retry_with_xf86vm;
+#endif
+			return -1;
+		}
+
+		XRRFreeScreenConfigInfo(xrr_config);
+		return 0;
+	}
+#endif
+
+	/*try xf86vm */
+#ifdef USE_XF86VM
+retry_with_xf86vm:
+	if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
+		XF86VidModeModeInfo **modes;
+		int mode_count;
+
+		if(!XF86VidModeGetAllModeLines(dpy, scr, &mode_count, &modes)) {
+			fprintf(stderr, "failed to get list of available video modes\n");
+			return -1;
+		}
+
+		for(i=0; i<mode_count; i++) {
+			if(modes[i]->hdisplay == xsz && modes[i]->vdisplay == ysz) {
+				break;
+			}
+		}
+		if(i == mode_count) {
+			fprintf(stderr, "requested size unsuppored by the X server configuration\n");
+			XFree(modes);
+			return -1;
+		}
+
+		if(!XF86VidModeSwitchToMode(dpy, scr, modes[i])) {
+			fprintf(stderr, "failed to set requested size with xf86vm\n");
+			XFree(modes);
+			return -1;
+		}
+		XF86VidModeSetViewPort(dpy, scr, 0, 0);
+
+		XFree(modes);
+		return 0;
+	}
+#endif
+
+	fprintf(stderr, "not possible to change display size\n");
+	return -1;
+}