diplodocus.org Git - xorg-xinput/blob - src/transform.c

   1 /*
   2  * Copyright © 2011 Red Hat, Inc.
   3  *
   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:
  10  *
  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
  13  * Software.
  14  *
  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.
  22  *
  23  */
  24
  25
  26 #include "xinput.h"
  27 #include <string.h>
  28 #include <X11/extensions/Xrandr.h>
  29 #include <X11/extensions/Xinerama.h>
  30
  31
  32 typedef struct Matrix {
  33     float m[9];
  34 } Matrix;
  35
  36 static void matrix_set(Matrix *m, int row, int col, float val)
  37 {
  38     m->m[row * 3 + col] = val;
  39 }
  40
  41 static void matrix_set_unity(Matrix *m)
  42 {
  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);
  47 }
  48
  49 #if DEBUG
  50 static void matrix_print(const Matrix *m)
  51 {
  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]);
  55 }
  56 #endif
  57
  58 static int
  59 apply_matrix(Display *dpy, int deviceid, Matrix *m)
  60 {
  61     Atom prop_float, prop_matrix;
  62
  63     union {
  64         unsigned char *c;
  65         float *f;
  66     } data;
  67     int format_return;
  68     Atom type_return;
  69     unsigned long nitems;
  70     unsigned long bytes_after;
  71
  72     int rc;
  73
  74     prop_float = XInternAtom(dpy, "FLOAT", False);
  75     prop_matrix = XInternAtom(dpy, "Coordinate Transformation Matrix", False);
  76
  77     if (!prop_float)
  78     {
  79         fprintf(stderr, "Float atom not found. This server is too old.\n");
  80         return EXIT_FAILURE;
  81     }
  82     if (!prop_matrix)
  83     {
  84         fprintf(stderr, "Coordinate transformation matrix not found. This "
  85                 "server is too old\n");
  86         return EXIT_FAILURE;
  87     }
  88
  89     rc = XIGetProperty(dpy, deviceid, prop_matrix, 0, 9, False, prop_float,
  90                        &type_return, &format_return, &nitems, &bytes_after,
  91                        &data.c);
  92     if (rc != Success || prop_float != type_return || format_return != 32 ||
  93         nitems != 9 || bytes_after != 0)
  94     {
  95         fprintf(stderr, "Failed to retrieve current property values\n");
  96         return EXIT_FAILURE;
  97     }
  98
  99     memcpy(data.f, m->m, sizeof(m->m));
 100
 101     XIChangeProperty(dpy, deviceid, prop_matrix, prop_float,
 102                      format_return, PropModeReplace, data.c, nitems);
 103
 104     XFree(data.c);
 105
 106     return EXIT_SUCCESS;
 107 }
 108
 109 static void
 110 set_transformation_matrix(Display *dpy, Matrix *m, int offset_x, int offset_y,
 111                                 int screen_width, int screen_height)
 112 {
 113     /* offset */
 114     int width = DisplayWidth(dpy, DefaultScreen(dpy));
 115     int height = DisplayHeight(dpy, DefaultScreen(dpy));
 116
 117     /* offset */
 118     float x = 1.0 * offset_x/width;
 119     float y = 1.0 * offset_y/height;
 120
 121     /* mapping */
 122     float w = 1.0 * screen_width/width;
 123     float h = 1.0 * screen_height/height;
 124
 125     matrix_set_unity(m);
 126
 127     matrix_set(m, 0, 2, x);
 128     matrix_set(m, 1, 2, y);
 129
 130     matrix_set(m, 0, 0, w);
 131     matrix_set(m, 1, 1, h);
 132
 133 #if DEBUG
 134     matrix_print(m);
 135 #endif
 136 }
 137
 138 static int
 139 map_crtc_xrandr(Display *dpy, int deviceid, const char *output_name)
 140 {
 141     int i, found = 0;
 142     int rc = EXIT_FAILURE;
 143     XRRScreenResources *res;
 144     XRROutputInfo *output_info;
 145     XRRCrtcInfo *crtc_info;
 146
 147     res = XRRGetScreenResources(dpy, DefaultRootWindow(dpy));
 148
 149     for (i = 0; i < res->noutput && !found; i++)
 150     {
 151         output_info = XRRGetOutputInfo(dpy, res, res->outputs[i]);
 152         if (!output_info->crtc || output_info->connection != RR_Connected)
 153             continue;
 154
 155         crtc_info = XRRGetCrtcInfo (dpy, res, output_info->crtc);
 156         if (strcmp(output_info->name, output_name) == 0)
 157         {
 158             found = 1;
 159             break;
 160         }
 161     }
 162
 163     /* crtc holds our screen info, need to compare to actual screen size */
 164     if (found)
 165     {
 166         Matrix m;
 167         matrix_set_unity(&m);
 168         set_transformation_matrix(dpy, &m, crtc_info->x, crtc_info->y,
 169                                   crtc_info->width, crtc_info->height);
 170         rc = apply_matrix(dpy, deviceid, &m);
 171     } else
 172         printf("Unable to find output '%s'. "
 173                 "Output may not be connected.\n", output_name);
 174
 175     XRRFreeScreenResources(res);
 176
 177     return rc;
 178 }
 179
 180 static int
 181 map_crtc_xinerama(Display *dpy, int deviceid, const char *output_name)
 182 {
 183     const char *prefix = "HEAD-";
 184     XineramaScreenInfo *screens = NULL;
 185     int rc = EXIT_FAILURE;
 186     int event, error;
 187     int nscreens;
 188     int head;
 189     Matrix m;
 190
 191     if (!XineramaQueryExtension(dpy, &event, &error))
 192     {
 193         fprintf(stderr, "Unable to set screen mapping. Xinerama extension not found\n");
 194         goto out;
 195     }
 196
 197     if (strlen(output_name) < strlen(prefix) + 1 ||
 198         strncmp(output_name, prefix, strlen(prefix)) != 0)
 199     {
 200         fprintf(stderr, "Please specify the output name as HEAD-X,"
 201                 "where X is the screen number\n");
 202         goto out;
 203     }
 204
 205     head = output_name[strlen(prefix)] - '0';
 206
 207     screens = XineramaQueryScreens(dpy, &nscreens);
 208
 209     if (nscreens == 0)
 210     {
 211         fprintf(stderr, "Xinerama failed to query screens.\n");
 212         goto out;
 213     } else if (nscreens <= head)
 214     {
 215         fprintf(stderr, "Found %d screens, but you requested %s.\n",
 216                 nscreens, output_name);
 217         goto out;
 218     }
 219
 220     matrix_set_unity(&m);
 221     set_transformation_matrix(dpy, &m,
 222                               screens[head].x_org, screens[head].y_org,
 223                               screens[head].width, screens[head].height);
 224     rc = apply_matrix(dpy, deviceid, &m);
 225
 226 out:
 227     XFree(screens);
 228     return rc;
 229 }
 230
 231 int
 232 map_to_crtc(Display *dpy, int argc, char *argv[], char *name, char *desc)
 233 {
 234     int opcode, event, error;
 235     int maj, min;
 236     char *crtc_name;
 237     XIDeviceInfo *info;
 238
 239     if (argc < 2)
 240     {
 241         fprintf(stderr, "Usage: xinput %s %s\n", name, desc);
 242         return EXIT_FAILURE;
 243     }
 244
 245     info = xi2_find_device_info(dpy, argv[0]);
 246     if (!info)
 247     {
 248         fprintf(stderr, "unable to find device %s\n", argv[0]);
 249         return EXIT_FAILURE;
 250     }
 251
 252     crtc_name = argv[1];
 253
 254     /* Check for RandR 1.2. Server bug causes the NVIDIA driver to
 255      * report with RandR 1.3 support but it doesn't expose RandR CRTCs.
 256      * Force Xinerama if NV-CONTROL is present */
 257     if (XQueryExtension(dpy, "NV-CONTROL", &opcode, &event, &error) ||
 258         !XQueryExtension(dpy, "RANDR", &opcode, &event, &error) ||
 259         !XRRQueryVersion(dpy, &maj, &min) || (maj * 1000 + min) < 1002)
 260        return map_crtc_xinerama(dpy, info->deviceid, crtc_name);
 261     else
 262        return map_crtc_xrandr(dpy, info->deviceid, crtc_name);
 263 }