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 #ifdef WITH_XRANDR
  42 inline Msp::Graphics::VideoRotation rotation_from_sys(Rotation r)
  43 {
  44         switch(r)
  45         {
  46         case RR_Rotate_90: return Msp::Graphics::ROTATE_RIGHT;
  47         case RR_Rotate_180: return Msp::Graphics::ROTATE_INVERTED;
  48         case RR_Rotate_270: return Msp::Graphics::ROTATE_LEFT;
  49         default: return Msp::Graphics::ROTATE_NORMAL;
  50         }
  51 }
  52
  53 inline Rotation rotation_to_sys(Msp::Graphics::VideoRotation r)
  54 {
  55         switch(r)
  56         {
  57         case Msp::Graphics::ROTATE_RIGHT: return RR_Rotate_90;
  58         case Msp::Graphics::ROTATE_INVERTED: return RR_Rotate_180;
  59         case Msp::Graphics::ROTATE_LEFT: return RR_Rotate_270;
  60         default: return RR_Rotate_0;
  61         }
  62 }
  63
  64 inline bool monitor_x_compare(const Msp::Graphics::Monitor &m1, const Msp::Graphics::Monitor &m2)
  65 {
  66         if(m1.desktop_mode && !m2.desktop_mode)
  67                 return true;
  68         return m1.x<m2.x;
  69 }
  70 #endif
  71
  72 inline unsigned mode_width(const Msp::Graphics::VideoMode &m, Msp::Graphics::VideoRotation r)
  73 {
  74         if(r==Msp::Graphics::ROTATE_RIGHT || r==Msp::Graphics::ROTATE_LEFT)
  75                 return m.height;
  76         else
  77                 return m.width;
  78 }
  79
  80 }
  81
  82
  83 namespace Msp {
  84 namespace Graphics {
  85
  86 Display::Display(const string &disp_name):
  87         primary_monitor(0),
  88         priv(new Private)
  89 {
  90         if(disp_name.empty())
  91                 priv->display = XOpenDisplay(0);
  92         else
  93                 priv->display = XOpenDisplay(disp_name.c_str());
  94         if(!priv->display)
  95                 throw runtime_error("XOpenDisplay");
  96
  97         XSetErrorHandler(x_error_handler);
  98
  99         err_dialog = new ErrorDialog(this);
 100
 101 #ifdef WITH_XRANDR
 102         int event_base;
 103         int error_base;
 104         if(XRRQueryExtension(priv->display, &event_base, &error_base))
 105         {
 106                 int major, minor;
 107                 XRRQueryVersion(priv->display, &major, &minor);
 108                 if(major>1 || (major==1 && minor>=2))
 109                 {
 110                         WindowHandle root = DefaultRootWindow(priv->display);
 111                         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
 112                         RROutput primary = XRRGetOutputPrimary(priv->display, root);
 113
 114                         map<RRMode, XRRModeInfo *> modes_by_id;
 115                         for(int i=0; i<res->nmode; ++i)
 116                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 117
 118                         for(int i=0; i<res->noutput; ++i)
 119                         {
 120                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 121                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : 0);
 122
 123                                 monitors.push_back(Monitor());
 124                                 Monitor &monitor = monitors.back();
 125                                 monitor.index = monitors.size()-1;
 126                                 monitor.name.assign(output->name, output->nameLen);
 127                                 priv->monitors.push_back(res->outputs[i]);
 128
 129                                 if(crtc)
 130                                 {
 131                                         monitor.desktop_rotation = rotation_from_sys(crtc->rotation);
 132                                         monitor.current_rotation = monitor.desktop_rotation;
 133                                         monitor.x = crtc->x;
 134                                         monitor.y = crtc->y;
 135                                 }
 136
 137                                 if(res->outputs[i]==primary)
 138                                         primary_monitor = &monitor;
 139
 140                                 for(int j=0; j<output->nmode; ++j)
 141                                 {
 142                                         map<RRMode, XRRModeInfo *>::iterator k = modes_by_id.find(output->modes[j]);
 143                                         if(k==modes_by_id.end())
 144                                                 continue;
 145
 146                                         XRRModeInfo *info = k->second;
 147
 148                                         VideoMode mode(info->width, info->height);
 149                                         mode.index = modes.size();
 150                                         mode.monitor = &monitor;
 151                                         mode.rate = static_cast<float>(info->dotClock)/(info->hTotal*info->vTotal);
 152                                         if(find_mode(mode, 0.01f))
 153                                                 continue;
 154
 155                                         modes.push_back(mode);
 156                                         priv->modes.push_back(info->id);
 157                                         monitor.video_modes.push_back(&modes.back());
 158
 159                                         if(crtc && info->id==crtc->mode)
 160                                         {
 161                                                 monitor.desktop_mode = &modes.back();
 162                                                 monitor.current_mode = monitor.desktop_mode;
 163                                         }
 164                                 }
 165
 166                                 XRRFreeOutputInfo(output);
 167                                 if(crtc)
 168                                         XRRFreeCrtcInfo(crtc);
 169                         }
 170
 171                         XRRFreeScreenResources(res);
 172
 173                         monitors.sort(monitor_x_compare);
 174                         Monitor *prev_enabled = 0;
 175                         for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 176                                 if(i->desktop_mode)
 177                                 {
 178                                         i->next_left = prev_enabled;
 179                                         if(prev_enabled)
 180                                                 prev_enabled->next_right = &*i;
 181                                         prev_enabled = &*i;
 182                                 }
 183
 184                         if(!primary_monitor || !primary_monitor->desktop_mode)
 185                         {
 186                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 187                                 unsigned largest = 0;
 188                                 for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 189                                         if(i->desktop_mode)
 190                                         {
 191                                                 unsigned size = i->desktop_mode->width*i->desktop_mode->height;
 192                                                 if(size>largest)
 193                                                 {
 194                                                         largest = size;
 195                                                         primary_monitor = &*i;
 196                                                 }
 197                                         }
 198                         }
 199                 }
 200         }
 201 #endif
 202 }
 203
 204 Display::~Display()
 205 {
 206         XCloseDisplay(priv->display);
 207         delete priv;
 208         delete err_dialog;
 209 }
 210
 211 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 212 {
 213 #ifdef WITH_XRANDR
 214         const VideoMode *mode = find_mode(requested_mode);
 215         if(!mode)
 216                 throw unsupported_video_mode(requested_mode);
 217
 218         VideoRotation requested_rotation = requested_mode.rotation;
 219         if(requested_rotation==ROTATE_ANY)
 220                 requested_rotation = mode->monitor->desktop_rotation;
 221
 222         WindowHandle root = DefaultRootWindow(priv->display);
 223         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
 224         RROutput output = priv->monitors[mode->monitor->index];
 225         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 226
 227         // Check if the output already has a CRTC and find a free one if it doesn't
 228         RRCrtc crtc = output_info->crtc;
 229         XRRCrtcInfo *crtc_info = 0;
 230         if(crtc)
 231                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 232         else
 233         {
 234                 for(int i=0; i<res->ncrtc; ++i)
 235                 {
 236                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 237                         if(!crtc_info->noutput)
 238                         {
 239                                 crtc = res->crtcs[i];
 240                                 break;
 241                         }
 242                         XRRFreeCrtcInfo(crtc_info);
 243                 }
 244
 245                 if(!crtc)
 246                 {
 247                         XRRFreeOutputInfo(output_info);
 248                         throw unsupported_video_mode(requested_mode);
 249                 }
 250         }
 251
 252         int x = 0;
 253         int y = 0;
 254
 255         if(exclusive)
 256         {
 257                 // Disable other outputs for exclusive mode
 258                 for(list<Monitor>::iterator i=monitors.begin(); i!=monitors.end(); ++i)
 259                         if(&*i!=mode->monitor)
 260                         {
 261                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[i->index]);
 262                                 if(o->crtc)
 263                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, 0, 0);
 264                                 XRRFreeOutputInfo(o);
 265
 266                                 i->current_mode = 0;
 267                                 i->current_rotation = ROTATE_NORMAL;
 268                                 i->x = 0;
 269                                 i->y = 0;
 270                         }
 271         }
 272         else
 273         {
 274                 const Monitor *left = mode->monitor->next_left;
 275                 while(left && !left->current_mode)
 276                         left = left->next_left;
 277
 278                 if(left)
 279                 {
 280                         x = left->x+mode_width(*left->current_mode, left->current_rotation);
 281                         y = left->y;
 282                 }
 283         }
 284
 285         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, priv->modes[mode->index], rotation_to_sys(requested_rotation), &output, 1);
 286
 287         list<Monitor>::iterator i;
 288         for(i=monitors.begin(); i!=monitors.end(); ++i)
 289                 if(&*i==mode->monitor)
 290                 {
 291                         i->current_mode = mode;
 292                         i->current_rotation = requested_rotation;
 293                         i->x = x;
 294                         i->y = y;
 295
 296                         x += mode_width(*mode, requested_rotation);
 297                         ++i;
 298                         break;
 299                 }
 300
 301         for(; i!=monitors.end(); ++i)
 302                 if(i->current_mode)
 303                 {
 304                         XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[i->index]);
 305                         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);
 306
 307                         XRRPanning panning;
 308                         panning.timestamp = CurrentTime;
 309                         panning.left = x;
 310                         panning.top = y;
 311                         panning.width = i->current_mode->width;
 312                         panning.height = i->current_mode->height;
 313                         panning.track_left = panning.left;
 314                         panning.track_top = panning.top;
 315                         panning.track_width = panning.width;
 316                         panning.track_height = panning.height;
 317                         panning.border_left = 0;
 318                         panning.border_top = 0;
 319                         panning.border_right = 0;
 320                         panning.border_bottom = 0;
 321                         XRRSetPanning(priv->display, res, o->crtc, &panning);
 322
 323                         XRRFreeOutputInfo(o);
 324
 325                         i->x = x;
 326                         i->y = y;
 327
 328                         x += mode_width(*i->current_mode, i->current_rotation);
 329                 }
 330
 331         XRRFreeOutputInfo(output_info);
 332         XRRFreeCrtcInfo(crtc_info);
 333         XRRFreeScreenResources(res);
 334 #else
 335         (void)requested_mode;
 336         (void)exclusive;
 337         throw runtime_error("no xrandr support");
 338 #endif
 339 }
 340
 341 bool Display::process_events()
 342 {
 343         int pending = XPending(priv->display);
 344         if(pending==0)
 345                 return false;
 346
 347         for(; pending--;)
 348         {
 349                 Window::Event event;
 350                 XNextEvent(priv->display, &event.xevent);
 351
 352                 check_error();
 353
 354                 map<WindowHandle, Window *>::iterator j = priv->windows.find(event.xevent.xany.window);
 355                 if(j!=priv->windows.end())
 356                 {
 357                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 358                         the next one is a KeyPress with the exact same parameters, they
 359                         indicate autorepeat and must be dropped. */
 360                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 361                         {
 362                                 XKeyEvent &kev = event.xevent.xkey;
 363                                 XEvent ev2;
 364                                 XPeekEvent(priv->display, &ev2);
 365                                 if(ev2.type==KeyPress)
 366                                 {
 367                                         XKeyEvent &kev2 = ev2.xkey;
 368                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 369                                         {
 370                                                 XNextEvent(priv->display, &ev2);
 371                                                 --pending;
 372                                                 continue;
 373                                         }
 374                                 }
 375                         }
 376
 377                         j->second->event(event);
 378                 }
 379         }
 380
 381         return true;
 382 }
 383
 384 void Display::check_error()
 385 {
 386         if(error_flag)
 387         {
 388                 error_flag = false;
 389                 throw runtime_error(error_msg);
 390         }
 391 }
 392
 393 } // namespace Msp
 394 } // namespace Graphics