source/graphics/x11/display.cpp

   1 #include <iostream>
   2 #include <X11/Xlib.h>
   3 #ifdef WITH_XRANDR
   4 #include <X11/extensions/Xrandr.h>
   5 #endif
   6 #include <msp/io/print.h>
   7 #include <msp/strings/format.h>
   8 #include <msp/strings/lexicalcast.h>
   9 #include "display.h"
  10 #include "display_private.h"
  11
  12 using namespace std;
  13
  14 namespace {
  15
  16 bool error_flag = false;
  17 std::string error_msg;
  18
  19 int x_error_handler(Display *display, XErrorEvent *event)
  20 {
  21         char err[128];
  22         XGetErrorText(display, event->error_code, err, sizeof(err));
  23
  24         string request_code = Msp::lexical_cast<string, int>(event->request_code);
  25         char req[128];
  26         XGetErrorDatabaseText(display, "XRequest", request_code.c_str(), request_code.c_str(), req, sizeof(req));
  27
  28         string msg = Msp::format("Request %s failed with %s [%08X]", req, err, event->resourceid);
  29         if(error_flag)
  30                 Msp::IO::print(Msp::IO::cerr, "Discarding error: %s\n", msg);
  31         else
  32         {
  33                 Msp::IO::print(Msp::IO::cerr, "%s\n", msg);
  34                 error_msg = msg;
  35                 error_flag = true;
  36         }
  37
  38         return 0;
  39 }
  40
  41 inline Msp::Graphics::VideoRotation rotation_from_sys(Rotation r)
  42 {
  43         switch(r)
  44         {
  45         case RR_Rotate_90: return Msp::Graphics::ROTATE_RIGHT;
  46         case RR_Rotate_180: return Msp::Graphics::ROTATE_INVERTED;
  47         case RR_Rotate_270: return Msp::Graphics::ROTATE_LEFT;
  48         default: return Msp::Graphics::ROTATE_NORMAL;
  49         }
  50 }
  51
  52 inline Rotation rotation_to_sys(Msp::Graphics::VideoRotation r)
  53 {
  54         switch(r)
  55         {
  56         case Msp::Graphics::ROTATE_RIGHT: return RR_Rotate_90;
  57         case Msp::Graphics::ROTATE_INVERTED: return RR_Rotate_180;
  58         case Msp::Graphics::ROTATE_LEFT: return RR_Rotate_270;
  59         default: return RR_Rotate_0;
  60         }
  61 }
  62
  63 bool monitor_x_compare(const Msp::Graphics::Monitor &m1, const Msp::Graphics::Monitor &m2)
  64 {
  65         if(m1.desktop_mode && !m2.desktop_mode)
  66                 return true;
  67         return m1.x<m2.x;
  68 }
  69
  70 inline unsigned mode_width(const Msp::Graphics::VideoMode &m, Msp::Graphics::VideoRotation r)
  71 {
  72         if(r==Msp::Graphics::ROTATE_RIGHT || r==Msp::Graphics::ROTATE_LEFT)
  73                 return m.height;
  74         else
  75                 return m.width;
  76 }
  77
  78 }
  79
  80
  81 namespace Msp {
  82 namespace Graphics {
  83
  84 Display::Display(const string &disp_name):
  85         primary_monitor(0),
  86         priv(new Private)
  87 {
  88         if(disp_name.empty())
  89                 priv->display = XOpenDisplay(0);
  90         else
  91                 priv->display = XOpenDisplay(disp_name.c_str());
  92         if(!priv->display)
  93                 throw runtime_error("XOpenDisplay");
  94
  95         XSetErrorHandler(x_error_handler);
  96
  97 #ifdef WITH_XRANDR
  98         int event_base;
  99         int error_base;
 100         if(XRRQueryExtension(priv->display, &event_base, &error_base))
 101         {
 102                 int major, minor;
 103                 XRRQueryVersion(priv->display, &major, &minor);
 104                 if(major>1 || (major==1 && minor>=2))
 105                 {
 106                         WindowHandle root = DefaultRootWindow(priv->display);
 107                         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
 108                         RROutput primary = XRRGetOutputPrimary(priv->display, root);
 109
 110                         map<RRMode, XRRModeInfo *> modes_by_id;
 111                         for(int i=0; i<res->nmode; ++i)
 112                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 113
 114                         for(int i=0; i<res->noutput; ++i)
 115                         {
 116                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 117                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : 0);
 118
 119                                 monitors.push_back(Monitor());
 120                                 Monitor &monitor = monitors.back();
 121                                 monitor.index = monitors.size()-1;
 122                                 priv->monitors.push_back(res->outputs[i]);
 123
 124                                 if(crtc)
 125                                 {
 126                                         monitor.desktop_rotation = rotation_from_sys(crtc->rotation);
 127                                         monitor.current_rotation = monitor.desktop_rotation;
 128                                         monitor.x = crtc->x;
 129                                         monitor.y = crtc->y;
 130                                 }
 131
 132                                 if(res->outputs[i]==primary)
 133                                         primary_monitor = &monitor;
 134
 135                                 for(int j=0; j<output->nmode; ++j)
 136                                 {
 137                                         map<RRMode, XRRModeInfo *>::iterator k = modes_by_id.find(output->modes[j]);
 138                                         if(k==modes_by_id.end())
 139                                                 continue;
 140
 141                                         XRRModeInfo *info = k->second;
 142
 143                                         VideoMode mode(info->width, info->height);
 144                                         mode.index = modes.size();
 145                                         mode.monitor = &monitor;
 146                                         mode.rate = info->dotClock/(info->hTotal*info->vTotal);
 147                                         if(find_matching_mode(mode))
 148                                                 continue;
 149
 150                                         modes.push_back(mode);
 151                                         priv->modes.push_back(info->id);
 152                                         monitor.video_modes.push_back(&modes.back());
 153
 154                                         if(crtc && info->id==crtc->mode)
 155                                         {
 156                                                 monitor.desktop_mode = &modes.back();
 157                                                 monitor.current_mode = monitor.desktop_mode;
 158                                         }
 159                                 }
 160
 161                                 XRRFreeOutputInfo(output);
 162                                 if(crtc)
 163                                         XRRFreeCrtcInfo(crtc);
 164                         }
 165
 166                         XRRFreeScreenResources(res);
 167
 168                         monitors.sort(monitor_x_compare);
 169                         Monitor *prev_enabled = 0;
 170                         for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 171                                 if(i->desktop_mode)
 172                                 {
 173                                         i->next_left = prev_enabled;
 174                                         if(prev_enabled)
 175                                                 prev_enabled->next_right = &*i;
 176                                         prev_enabled = &*i;
 177                                 }
 178
 179                         if(!primary_monitor || !primary_monitor->desktop_mode)
 180                         {
 181                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 182                                 unsigned largest = 0;
 183                                 for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 184                                         if(i->desktop_mode)
 185                                         {
 186                                                 unsigned size = i->desktop_mode->width*i->desktop_mode->height;
 187                                                 if(size>largest)
 188                                                 {
 189                                                         largest = size;
 190                                                         primary_monitor = &*i;
 191                                                 }
 192                                         }
 193                         }
 194                 }
 195         }
 196 #endif
 197 }
 198
 199 Display::~Display()
 200 {
 201         XCloseDisplay(priv->display);
 202         delete priv;
 203 }
 204
 205 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 206 {
 207 #ifdef WITH_XRANDR
 208         const VideoMode *mode = find_matching_mode(requested_mode);
 209         if(!mode)
 210                 throw unsupported_video_mode(requested_mode);
 211
 212         VideoRotation requested_rotation = requested_mode.rotation;
 213         if(requested_rotation==ROTATE_ANY)
 214                 requested_rotation = mode->monitor->desktop_rotation;
 215
 216         WindowHandle root = DefaultRootWindow(priv->display);
 217         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
 218         RROutput output = priv->monitors[mode->monitor->index];
 219         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 220
 221         // Check if the output already has a CRTC and find a free one if it doesn't
 222         RRCrtc crtc = output_info->crtc;
 223         XRRCrtcInfo *crtc_info = 0;
 224         if(crtc)
 225                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 226         else
 227         {
 228                 for(int i=0; i<res->ncrtc; ++i)
 229                 {
 230                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 231                         if(!crtc_info->noutput)
 232                         {
 233                                 crtc = res->crtcs[i];
 234                                 break;
 235                         }
 236                         XRRFreeCrtcInfo(crtc_info);
 237                 }
 238
 239                 if(!crtc)
 240                 {
 241                         XRRFreeOutputInfo(output_info);
 242                         throw unsupported_video_mode(requested_mode);
 243                 }
 244         }
 245
 246         int x = 0;
 247         int y = 0;
 248
 249         if(exclusive)
 250         {
 251                 // Disable other outputs for exclusive mode
 252                 for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 253                         if(&*i!=mode->monitor)
 254                         {
 255                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[i->index]);
 256                                 if(o->crtc)
 257                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, 0, 0);
 258                                 XRRFreeOutputInfo(o);
 259
 260                                 i->current_mode = 0;
 261                                 i->current_rotation = ROTATE_NORMAL;
 262                                 i->x = 0;
 263                                 i->y = 0;
 264                         }
 265         }
 266         else
 267         {
 268                 const Monitor *left = mode->monitor->next_left;
 269                 while(left && !left->current_mode)
 270                         left = left->next_left;
 271
 272                 if(left)
 273                 {
 274                         x = left->x+mode_width(*left->current_mode, left->current_rotation);
 275                         y = left->y;
 276                 }
 277         }
 278
 279         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, priv->modes[mode->index], rotation_to_sys(requested_rotation), &output, 1);
 280
 281         list<Monitor>::iterator i;
 282         for(i=monitors.begin(); i!=monitors.end(); ++i)
 283                 if(&*i==mode->monitor)
 284                 {
 285                         i->current_mode = mode;
 286                         i->current_rotation = requested_rotation;
 287                         i->x = x;
 288                         i->y = y;
 289
 290                         x += mode_width(*mode, requested_rotation);
 291                         ++i;
 292                         break;
 293                 }
 294
 295         for(; i!=monitors.end(); ++i)
 296                 if(i->current_mode)
 297                 {
 298                         XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[i->index]);
 299                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, x, y, priv->modes[i->current_mode->index], rotation_to_sys(i->current_rotation), &priv->monitors[i->index], 1);
 300                         XRRFreeOutputInfo(o);
 301
 302                         i->x = x;
 303                         i->y = y;
 304
 305                         x += mode_width(*i->current_mode, i->current_rotation);
 306                 }
 307
 308         XRRFreeOutputInfo(output_info);
 309         XRRFreeCrtcInfo(crtc_info);
 310         XRRFreeScreenResources(res);
 311 #else
 312         (void)requested_mode;
 313         (void)exclusive;
 314         throw runtime_error("no xrandr support");
 315 #endif
 316 }
 317
 318 bool Display::process_events()
 319 {
 320         int pending = XPending(priv->display);
 321         if(pending==0)
 322                 return false;
 323
 324         for(; pending--;)
 325         {
 326                 Window::Event event;
 327                 XNextEvent(priv->display, &event.xevent);
 328
 329                 check_error();
 330
 331                 map<WindowHandle, Window *>::iterator j = priv->windows.find(event.xevent.xany.window);
 332                 if(j!=priv->windows.end())
 333                 {
 334                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 335                         the next one is a KeyPress with the exact same parameters, they
 336                         indicate autorepeat and must be dropped. */
 337                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 338                         {
 339                                 XKeyEvent &kev = event.xevent.xkey;
 340                                 XEvent ev2;
 341                                 XPeekEvent(priv->display, &ev2);
 342                                 if(ev2.type==KeyPress)
 343                                 {
 344                                         XKeyEvent &kev2 = ev2.xkey;
 345                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 346                                         {
 347                                                 XNextEvent(priv->display, &ev2);
 348                                                 --pending;
 349                                                 continue;
 350                                         }
 351                                 }
 352                         }
 353
 354                         j->second->event(event);
 355                 }
 356         }
 357
 358         return true;
 359 }
 360
 361 void Display::check_error()
 362 {
 363         if(error_flag)
 364         {
 365                 error_flag = false;
 366                 throw runtime_error(error_msg);
 367         }
 368 }
 369
 370 } // namespace Msp
 371 } // namespace Graphics