xresize

view xresize.c @ 1:a2c94df7f405

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foo
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 04 Sep 2012 05:07:29 +0300
parents 8555f3aabbc7
children
line source
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <ctype.h>
5 #include <X11/Xlib.h>
6
7 #ifdef USE_XRANDR
8 #include <X11/extensions/Xrandr.h>
9
10 char *randr_err_msg[] = {
11 "RRSetConfigSuccess",
12 "RRSetConfigInvalidConfigTime",
13 "RRSetConfigInvalidTime",
14 "RRSetConfigFailed"
15 };
16 #endif
17
18 #ifdef USE_XF86VM
19 #include <X11/extensions/xf86vmode.h>
20 #endif
21
22 int get_size(Display *dpy, int scr, int *xsz, int *ysz);
23 int set_size(Display *dpy, int scr, int xsz, int ysz);
24
25 const char *usage = "usage: %s [options]\n"
26 "options:\n"
27 " -s <w>x<h> set specified screen size\n"
28 " -f force size change without current size detection\n"
29 " --no-xrandr do not use the xrandr extension\n"
30 " --no-xf86vm do not use the xf86-vidmode extension\n"
31 " -h this usage information\n";
32
33 int use_xrandr = 1;
34 int use_xf86vm = 1;
35
36 int main(int argc, char **argv)
37 {
38 int i, cur_xres, cur_yres, xres = -1, yres = -1;
39 int force = 0;
40 Display *dpy;
41 int scr;
42
43 for(i=1; i<argc; i++) {
44 if(argv[i][0] == '-' && (argv[i][2] == 0 || argv[i][1] == '-')) {
45 char *sep;
46
47 switch(argv[i][1]) {
48 case 's':
49 if(!isdigit(argv[++i][0]) || !(sep = strchr(argv[i], 'x')) || !isdigit(*(sep + 1))) {
50 fputs("-s must be followed by something like \"640x480\"\n", stderr);
51 return EXIT_FAILURE;
52 }
53 xres = atoi(argv[i]);
54 yres = atoi(sep + 1);
55 break;
56
57 case 'f':
58 force = 1;
59 break;
60
61 case 'h':
62 printf(usage, argv[0]);
63 return 0;
64
65 case '-':
66 if(strcmp(argv[i], "--no-xrandr") == 0) {
67 use_xrandr = 0;
68 break;
69 } else if(strcmp(argv[i], "--no-xf86vm") == 0) {
70 use_xf86vm = 0;
71 break;
72 }
73 /* fallthrough to invalid arg */
74 default:
75 fprintf(stderr, "unrecognized option: %s, try -h for usage\n", argv[i]);
76 return 1;
77 }
78 } else {
79 fprintf(stderr, "unexpected argument: %s\n", argv[i]);
80 return 1;
81 }
82 }
83
84 if(!(dpy = XOpenDisplay(0))) {
85 fprintf(stderr, "failed to connect to the X server\n");
86 return 1;
87 }
88 scr = DefaultScreen(dpy);
89
90 if(get_size(dpy, scr, &cur_xres, &cur_yres) == -1) {
91 fprintf(stderr, "failed to retreive current screen size\n");
92 XCloseDisplay(dpy);
93 return 1;
94 }
95 printf("current size: %dx%d\n", cur_xres, cur_yres);
96
97 if(xres != -1) { /* size change requested */
98 if(xres != cur_xres || yres != cur_yres || force) {
99 if(set_size(dpy, scr, xres, yres) == -1) {
100 fprintf(stderr, "set_size failed\n");
101 XCloseDisplay(dpy);
102 return 1;
103 }
104 printf("size updated sucessfully\n");
105 } else {
106 printf("already at requested size! do nothing (use -f to force change).\n");
107 }
108 }
109 XCloseDisplay(dpy);
110 return 0;
111 }
112
113 int get_size(Display *dpy, int scr, int *xsz, int *ysz)
114 {
115 Window root;
116 int event_base, error_base;
117
118 scr = DefaultScreen(dpy);
119 root = RootWindow(dpy, scr);
120
121 /* first try r&r */
122 #ifdef USE_XRANDR
123 if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
124 XRRScreenConfiguration *xrr_config;
125 XRRScreenSize *ssizes;
126 Rotation rot;
127 int ssize_count, curr;
128
129 if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
130 fprintf(stderr, "failed to retrieve screen configuration\n");
131 return -1;
132 }
133 ssizes = XRRConfigSizes(xrr_config, &ssize_count);
134 curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
135
136 *xsz = ssizes[curr].width;
137 *ysz = ssizes[curr].height;
138
139 XRRFreeScreenConfigInfo(xrr_config);
140 return 0;
141 }
142 #endif
143
144 /* then try xf86vm */
145 #ifdef USE_XF86VM
146 if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
147 XF86VidModeModeLine modeline;
148 int dot_clock;
149
150 if(!XF86VidModeGetModeLine(dpy, scr, &dot_clock, &modeline)) {
151 fprintf(stderr, "failed to get current video mode\n");
152 return -1;
153 }
154
155 *xsz = modeline.hdisplay;
156 *ysz = modeline.vdisplay;
157
158 if(modeline.privsize) {
159 XFree(modeline.private);
160 }
161 return 0;
162 }
163 #endif
164
165 fprintf(stderr, "can't get any size information\n");
166 return -1;
167 }
168
169
170 int set_size(Display *dpy, int scr, int xsz, int ysz)
171 {
172 int i, event_base, error_base;
173 Window root;
174
175 root = RootWindow(dpy, scr);
176
177 /* first try r&r */
178 #ifdef USE_XRANDR
179 if(use_xrandr && XRRQueryExtension(dpy, &event_base, &error_base)) {
180 Status st;
181 XRRScreenConfiguration *xrr_config;
182 XRRScreenSize *ssizes;
183 Rotation rot;
184 int ssize_count, curr;
185 Time timestamp, cfg_timestamp;
186
187 if(!(xrr_config = XRRGetScreenInfo(dpy, root))) {
188 fprintf(stderr, "failed to retrieve screen configuration\n");
189 return -1;
190 }
191 ssizes = XRRConfigSizes(xrr_config, &ssize_count);
192 curr = XRRConfigCurrentConfiguration(xrr_config, &rot);
193 timestamp = XRRConfigTimes(xrr_config, &cfg_timestamp);
194
195 if(xsz == ssizes[curr].width && ysz == ssizes[curr].height) {
196 XRRFreeScreenConfigInfo(xrr_config);
197 return 0;
198 }
199
200 for(i=0; i<ssize_count; i++) {
201 if(ssizes[i].width == xsz && ssizes[i].height == ysz) {
202 break;
203 }
204 }
205 if(i == ssize_count) {
206 fprintf(stderr, "requested size unsuppored by the X server configuration\n");
207 XRRFreeScreenConfigInfo(xrr_config);
208 return -1;
209 }
210
211 if((st = XRRSetScreenConfig(dpy, xrr_config, root, i, rot, timestamp)) != 0) {
212 fprintf(stderr, "failed to set resolution with r-and-r, error: %d (%s)\n", st, randr_err_msg[st]);
213 XRRFreeScreenConfigInfo(xrr_config);
214 #ifdef USE_XF86VM
215 printf("retrying with xf86vm...\n");
216 goto retry_with_xf86vm;
217 #endif
218 return -1;
219 }
220
221 XRRFreeScreenConfigInfo(xrr_config);
222 return 0;
223 }
224 #endif
225
226 /*try xf86vm */
227 #ifdef USE_XF86VM
228 retry_with_xf86vm:
229 if(use_xf86vm && XF86VidModeQueryExtension(dpy, &event_base, &error_base)) {
230 XF86VidModeModeInfo **modes;
231 int mode_count;
232
233 if(!XF86VidModeGetAllModeLines(dpy, scr, &mode_count, &modes)) {
234 fprintf(stderr, "failed to get list of available video modes\n");
235 return -1;
236 }
237
238 for(i=0; i<mode_count; i++) {
239 if(modes[i]->hdisplay == xsz && modes[i]->vdisplay == ysz) {
240 break;
241 }
242 }
243 if(i == mode_count) {
244 fprintf(stderr, "requested size unsuppored by the X server configuration\n");
245 XFree(modes);
246 return -1;
247 }
248
249 if(!XF86VidModeSwitchToMode(dpy, scr, modes[i])) {
250 fprintf(stderr, "failed to set requested size with xf86vm\n");
251 XFree(modes);
252 return -1;
253 }
254 XF86VidModeSetViewPort(dpy, scr, 0, 0);
255
256 XFree(modes);
257 return 0;
258 }
259 #endif
260
261 fprintf(stderr, "not possible to change display size\n");
262 return -1;
263 }