2 * Copyright © 2011 Red Hat, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
28 #include <X11/extensions/Xrandr.h>
29 #include <X11/extensions/Xinerama.h>
32 typedef struct Matrix {
36 static void matrix_set(Matrix *m, int row, int col, float val)
38 m->m[row * 3 + col] = val;
41 static void matrix_set_unity(Matrix *m)
43 memset(m, 0, sizeof(m->m));
44 matrix_set(m, 0, 0, 1);
45 matrix_set(m, 1, 1, 1);
46 matrix_set(m, 2, 2, 1);
50 static void matrix_print(const Matrix *m)
52 printf("[ %3.3f %3.3f %3.3f ]\n", m->m[0], m->m[1], m->m[2]);
53 printf("[ %3.3f %3.3f %3.3f ]\n", m->m[3], m->m[4], m->m[5]);
54 printf("[ %3.3f %3.3f %3.3f ]\n", m->m[6], m->m[7], m->m[8]);
59 apply_matrix(Display *dpy, int deviceid, Matrix *m)
61 Atom prop_float, prop_matrix;
70 unsigned long bytes_after;
74 prop_float = XInternAtom(dpy, "FLOAT", False);
75 prop_matrix = XInternAtom(dpy, "Coordinate Transformation Matrix", False);
79 fprintf(stderr, "Float atom not found. This server is too old.\n");
84 fprintf(stderr, "Coordinate transformation matrix not found. This "
85 "server is too old\n");
89 rc = XIGetProperty(dpy, deviceid, prop_matrix, 0, 9, False, prop_float,
90 &type_return, &format_return, &nitems, &bytes_after,
92 if (rc != Success || prop_float != type_return || format_return != 32 ||
93 nitems != 9 || bytes_after != 0)
95 fprintf(stderr, "Failed to retrieve current property values\n");
99 memcpy(data.f, m->m, sizeof(m->m));
101 XIChangeProperty(dpy, deviceid, prop_matrix, prop_float,
102 format_return, PropModeReplace, data.c, nitems);
110 set_transformation_matrix(Display *dpy, Matrix *m, int offset_x, int offset_y,
111 int screen_width, int screen_height)
114 int width = DisplayWidth(dpy, DefaultScreen(dpy));
115 int height = DisplayHeight(dpy, DefaultScreen(dpy));
118 float x = 1.0 * offset_x/width;
119 float y = 1.0 * offset_y/height;
122 float w = 1.0 * screen_width/width;
123 float h = 1.0 * screen_height/height;
127 matrix_set(m, 0, 2, x);
128 matrix_set(m, 1, 2, y);
130 matrix_set(m, 0, 0, w);
131 matrix_set(m, 1, 1, h);
138 /* Caller must free return value */
139 static XRROutputInfo*
140 find_output_xrandr(Display *dpy, const char *output_name)
142 XRRScreenResources *res;
143 XRROutputInfo *output_info = NULL;
147 res = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
149 for (i = 0; i < res->noutput && !found; i++)
151 output_info = XRRGetOutputInfo(dpy, res, res->outputs[i]);
153 if (output_info->crtc && output_info->connection == RR_Connected &&
154 strcmp(output_info->name, output_name) == 0)
160 XRRFreeOutputInfo(output_info);
163 XRRFreeScreenResources(res);
172 map_output_xrandr(Display *dpy, int deviceid, const char *output_name)
174 int rc = EXIT_FAILURE;
175 XRRScreenResources *res;
176 XRROutputInfo *output_info;
178 res = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
179 output_info = find_output_xrandr(dpy, output_name);
181 /* crtc holds our screen info, need to compare to actual screen size */
184 XRRCrtcInfo *crtc_info;
186 matrix_set_unity(&m);
187 crtc_info = XRRGetCrtcInfo (dpy, res, output_info->crtc);
188 set_transformation_matrix(dpy, &m, crtc_info->x, crtc_info->y,
189 crtc_info->width, crtc_info->height);
190 rc = apply_matrix(dpy, deviceid, &m);
191 XRRFreeCrtcInfo(crtc_info);
192 XRRFreeOutputInfo(output_info);
194 printf("Unable to find output '%s'. "
195 "Output may not be connected.\n", output_name);
197 XRRFreeScreenResources(res);
203 map_output_xinerama(Display *dpy, int deviceid, const char *output_name)
205 const char *prefix = "HEAD-";
206 XineramaScreenInfo *screens = NULL;
207 int rc = EXIT_FAILURE;
213 if (!XineramaQueryExtension(dpy, &event, &error))
215 fprintf(stderr, "Unable to set screen mapping. Xinerama extension not found\n");
219 if (strlen(output_name) < strlen(prefix) + 1 ||
220 strncmp(output_name, prefix, strlen(prefix)) != 0)
222 fprintf(stderr, "Please specify the output name as HEAD-X,"
223 "where X is the screen number\n");
227 head = output_name[strlen(prefix)] - '0';
229 screens = XineramaQueryScreens(dpy, &nscreens);
233 fprintf(stderr, "Xinerama failed to query screens.\n");
235 } else if (nscreens <= head)
237 fprintf(stderr, "Found %d screens, but you requested %s.\n",
238 nscreens, output_name);
242 matrix_set_unity(&m);
243 set_transformation_matrix(dpy, &m,
244 screens[head].x_org, screens[head].y_org,
245 screens[head].width, screens[head].height);
246 rc = apply_matrix(dpy, deviceid, &m);
254 map_to_output(Display *dpy, int argc, char *argv[], char *name, char *desc)
258 XRROutputInfo *output_info;
262 fprintf(stderr, "Usage: xinput %s %s\n", name, desc);
266 info = xi2_find_device_info(dpy, argv[0]);
269 fprintf(stderr, "unable to find device '%s'\n", argv[0]);
273 output_name = argv[1];
274 output_info = find_output_xrandr(dpy, output_name);
277 /* Output doesn't exist. Is this a (partial) non-RandR setup? */
278 output_info = find_output_xrandr(dpy, "default");
281 XRRFreeOutputInfo(output_info);
282 if (strncmp("HEAD-", output_name, strlen("HEAD-")) == 0)
283 return map_output_xinerama(dpy, info->deviceid, output_name);
286 XRRFreeOutputInfo(output_info);
288 return map_output_xrandr(dpy, info->deviceid, output_name);