source/graphics/x11/display.cpp

   1 #include "display.h"
   2 #include "display_private.h"
   3 #include <X11/Xlib.h>
   4 #include <X11/Xatom.h>
   5 #ifdef WITH_XRANDR
   6 #include <X11/extensions/Xrandr.h>
   7 #endif
   8 #include <msp/core/algorithm.h>
   9 #include <msp/io/print.h>
  10 #include <msp/strings/format.h>
  11 #include <msp/strings/lexicalcast.h>
  12
  13 using namespace std;
  14
  15 namespace {
  16
  17 bool error_flag = false;
  18 string error_msg;
  19
  20 int x_error_handler(Display *display, XErrorEvent *event)
  21 {
  22         char err[128];
  23         XGetErrorText(display, event->error_code, err, sizeof(err));
  24
  25         string request_code = Msp::lexical_cast<string, int>(event->request_code);
  26         char req[128];
  27         XGetErrorDatabaseText(display, "XRequest", request_code.c_str(), request_code.c_str(), req, sizeof(req));
  28
  29         string msg = Msp::format("Request %s failed with %s [%08X]", req, err, event->resourceid);
  30         if(error_flag)
  31                 Msp::IO::print(Msp::IO::cerr, "Discarding error: %s\n", msg);
  32         else
  33         {
  34                 Msp::IO::print(Msp::IO::cerr, "%s\n", msg);
  35                 error_msg = msg;
  36                 error_flag = true;
  37         }
  38
  39         return 0;
  40 }
  41
  42 #ifdef WITH_XRANDR
  43 inline Msp::Graphics::VideoRotation rotation_from_sys(Rotation r)
  44 {
  45         switch(r)
  46         {
  47         case RR_Rotate_90: return Msp::Graphics::ROTATE_RIGHT;
  48         case RR_Rotate_180: return Msp::Graphics::ROTATE_INVERTED;
  49         case RR_Rotate_270: return Msp::Graphics::ROTATE_LEFT;
  50         default: return Msp::Graphics::ROTATE_NORMAL;
  51         }
  52 }
  53
  54 inline Rotation rotation_to_sys(Msp::Graphics::VideoRotation r)
  55 {
  56         switch(r)
  57         {
  58         case Msp::Graphics::ROTATE_RIGHT: return RR_Rotate_90;
  59         case Msp::Graphics::ROTATE_INVERTED: return RR_Rotate_180;
  60         case Msp::Graphics::ROTATE_LEFT: return RR_Rotate_270;
  61         default: return RR_Rotate_0;
  62         }
  63 }
  64 #endif
  65
  66 }
  67
  68
  69 namespace Msp {
  70 namespace Graphics {
  71
  72 Display::Display(const string &disp_name):
  73         priv(new Private)
  74 {
  75         if(disp_name.empty())
  76                 priv->display = XOpenDisplay(nullptr);
  77         else
  78                 priv->display = XOpenDisplay(disp_name.c_str());
  79         if(!priv->display)
  80                 throw runtime_error("XOpenDisplay");
  81
  82         XSetErrorHandler(x_error_handler);
  83
  84         priv->root_window = DefaultRootWindow(priv->display);
  85
  86         err_dialog = new ErrorDialog(this);
  87
  88 #ifdef WITH_XRANDR
  89         int event_base;
  90         int error_base;
  91         if(XRRQueryExtension(priv->display, &event_base, &error_base))
  92         {
  93                 int major, minor;
  94                 XRRQueryVersion(priv->display, &major, &minor);
  95                 if(major>1 || (major==1 && minor>=2))
  96                 {
  97                         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
  98                         RROutput primary = XRRGetOutputPrimary(priv->display, priv->root_window);
  99                         Atom edid_prop = XInternAtom(priv->display, RR_PROPERTY_RANDR_EDID, true);
 100
 101                         map<RRMode, XRRModeInfo *> modes_by_id;
 102                         for(int i=0; i<res->nmode; ++i)
 103                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 104
 105                         int primary_index = -1;
 106                         vector<unsigned> mode_monitor_indices;
 107                         vector<int> desktop_mode_indices;
 108                         for(int i=0; i<res->noutput; ++i)
 109                         {
 110                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 111                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : nullptr);
 112
 113                                 monitors.push_back(Monitor());
 114                                 Monitor &monitor = monitors.back();
 115                                 monitor.index = monitors.size()-1;
 116                                 monitor.name.assign(output->name, output->nameLen);
 117                                 priv->monitors.push_back(res->outputs[i]);
 118
 119                                 if(edid_prop)
 120                                 {
 121                                         Atom prop_type;
 122                                         int prop_format;
 123                                         unsigned long length;
 124                                         unsigned long overflow;
 125                                         unsigned char *edid = nullptr;
 126                                         XRRGetOutputProperty(priv->display, res->outputs[i], edid_prop, 0, 32, false, false, XA_INTEGER, &prop_type, &prop_format, &length, &overflow, &edid);
 127                                         if(prop_type==XA_INTEGER && prop_format==8)
 128                                         {
 129                                                 for(unsigned j=0; j<4; ++j)
 130                                                 {
 131                                                         unsigned offset = 54+j*18;
 132                                                         if(edid[offset]==0 && edid[offset+1]==0 && edid[offset+3]==0xFC)
 133                                                         {
 134                                                                 unsigned k;
 135                                                                 for(k=0; (k<13 && edid[offset+5+k]!=0x0A); ++k) ;
 136                                                                 monitor.name.assign(reinterpret_cast<char *>(edid+offset+5), k);
 137                                                         }
 138                                                 }
 139                                         }
 140                                         XFree(edid);
 141                                 }
 142
 143                                 if(crtc)
 144                                 {
 145                                         monitor.desktop_settings.rotation = rotation_from_sys(crtc->rotation);
 146                                         monitor.desktop_settings.x = crtc->x;
 147                                         monitor.desktop_settings.y = crtc->y;
 148                                 }
 149
 150                                 if(res->outputs[i]==primary)
 151                                         primary_index = monitor.index;
 152
 153                                 unsigned first_mode = modes.size();
 154                                 int desktop_mode_index = -1;
 155                                 for(int j=0; j<output->nmode; ++j)
 156                                 {
 157                                         auto k = modes_by_id.find(output->modes[j]);
 158                                         if(k==modes_by_id.end())
 159                                                 continue;
 160
 161                                         XRRModeInfo *info = k->second;
 162                                         float rate = static_cast<float>(info->dotClock)/(info->hTotal*info->vTotal);
 163
 164                                         if(any_of(modes.begin()+first_mode, modes.end(), [&info, rate](const VideoMode &m){
 165                                                         return (m.width==info->width && m.height==info->height && abs(m.rate-rate)<0.01f);
 166                                                 }))
 167                                                 continue;
 168
 169                                         VideoMode mode(info->width, info->height);
 170                                         mode.index = modes.size();
 171                                         mode.rate = rate;
 172
 173                                         modes.push_back(mode);
 174                                         priv->modes.push_back(info->id);
 175                                         mode_monitor_indices.push_back(monitor.index);
 176
 177                                         if(crtc && info->id==crtc->mode)
 178                                                 desktop_mode_index = mode.index;
 179                                 }
 180                                 desktop_mode_indices.push_back(desktop_mode_index);
 181
 182                                 XRRFreeOutputInfo(output);
 183                                 if(crtc)
 184                                         XRRFreeCrtcInfo(crtc);
 185                         }
 186
 187                         XRRFreeScreenResources(res);
 188
 189                         for(unsigned i=0; i<monitors.size(); ++i)
 190                         {
 191                                 int j = desktop_mode_indices[i];
 192                                 if(j>=0)
 193                                         monitors[i].desktop_settings.mode = &modes[j];
 194                                 monitors[i].current_settings = monitors[i].desktop_settings;
 195                         }
 196
 197                         sort(monitors, [](const Msp::Graphics::Monitor &m1, const Msp::Graphics::Monitor &m2){
 198                                 if(m1.desktop_settings.mode && !m2.desktop_settings.mode)
 199                                         return true;
 200                                 if(!m1.desktop_settings.mode && m2.desktop_settings.mode)
 201                                         return false;
 202                                 return m1.desktop_settings.x<m2.desktop_settings.x;
 203                         });
 204
 205                         for(unsigned i=0; i<modes.size(); ++i)
 206                         {
 207                                 auto j = find_member(monitors, mode_monitor_indices[i], &Monitor::index);
 208                                 modes[i].monitor = &*j;
 209                                 j->video_modes.push_back(&modes[i]);
 210                         }
 211
 212                         Monitor *prev_enabled = nullptr;
 213                         for(Monitor &m: monitors)
 214                                 if(m.desktop_settings.mode)
 215                                 {
 216                                         m.next_left = prev_enabled;
 217                                         if(prev_enabled)
 218                                                 prev_enabled->next_right = &m;
 219                                         prev_enabled = &m;
 220                                 }
 221
 222                         if(primary_index>=0)
 223                                 primary_monitor = &*find_member(monitors, static_cast<unsigned>(primary_index), &Monitor::index);
 224
 225                         if(!primary_monitor || !primary_monitor->desktop_settings.mode)
 226                         {
 227                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 228                                 unsigned largest = 0;
 229                                 for(Monitor &m: monitors)
 230                                         if(const VideoMode *desktop_mode = m.desktop_settings.mode)
 231                                         {
 232                                                 unsigned size = desktop_mode->width*desktop_mode->height;
 233                                                 if(size>largest)
 234                                                 {
 235                                                         largest = size;
 236                                                         primary_monitor = &m;
 237                                                 }
 238                                         }
 239                         }
 240                 }
 241         }
 242 #endif
 243 }
 244
 245 Display::~Display()
 246 {
 247         XCloseDisplay(priv->display);
 248         delete priv;
 249         delete err_dialog;
 250 }
 251
 252 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 253 {
 254 #ifdef WITH_XRANDR
 255         const VideoMode *mode = find_mode(requested_mode);
 256         if(!mode)
 257                 throw unsupported_video_mode(requested_mode);
 258
 259         VideoRotation requested_rotation = requested_mode.rotation;
 260         if(requested_rotation==ROTATE_ANY)
 261                 requested_rotation = mode->monitor->desktop_settings.rotation;
 262
 263         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 264         RROutput output = priv->monitors[mode->monitor->index];
 265         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 266
 267         // Check if the output already has a CRTC and find a free one if it doesn't
 268         RRCrtc crtc = output_info->crtc;
 269         XRRCrtcInfo *crtc_info = nullptr;
 270         if(crtc)
 271                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 272         else
 273         {
 274                 for(int i=0; i<res->ncrtc; ++i)
 275                 {
 276                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 277                         if(!crtc_info->noutput)
 278                         {
 279                                 crtc = res->crtcs[i];
 280                                 break;
 281                         }
 282                         XRRFreeCrtcInfo(crtc_info);
 283                 }
 284
 285                 if(!crtc)
 286                 {
 287                         XRRFreeOutputInfo(output_info);
 288                         throw unsupported_video_mode(requested_mode);
 289                 }
 290         }
 291
 292         /* Due to the semantics of find_mode, the mode's monitor pointer must point
 293         to one of the elements of the monitors list, which is non-const here. */
 294         Monitor *monitor = const_cast<Monitor *>(mode->monitor);
 295
 296         if(exclusive)
 297         {
 298                 monitor->current_settings.mode = mode;
 299                 monitor->current_settings.rotation = requested_rotation;
 300                 monitor->current_settings.x = 0;
 301                 monitor->current_settings.y = 0;
 302
 303                 // Disable other outputs for exclusive mode
 304                 for(Monitor &m: monitors)
 305                         if(&m!=mode->monitor)
 306                         {
 307                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[m.index]);
 308                                 if(o->crtc)
 309                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, nullptr, 0);
 310                                 XRRFreeOutputInfo(o);
 311
 312                                 m.current_settings.mode = nullptr;
 313                                 m.current_settings.rotation = ROTATE_NORMAL;
 314                                 m.current_settings.x = 0;
 315                                 m.current_settings.y = 0;
 316                         }
 317         }
 318         else
 319         {
 320                 monitor->current_settings.x = monitor->desktop_settings.x;
 321                 monitor->current_settings.y = monitor->desktop_settings.y;
 322         }
 323
 324         RRMode mode_id = priv->modes[mode->index];
 325         int x = monitor->current_settings.x;
 326         int y = monitor->current_settings.y;
 327         Rotation sys_rot = rotation_to_sys(requested_rotation);
 328         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, mode_id, sys_rot, &output, 1);
 329
 330         XRRFreeOutputInfo(output_info);
 331         XRRFreeCrtcInfo(crtc_info);
 332         XRRFreeScreenResources(res);
 333 #else
 334         (void)requested_mode;
 335         (void)exclusive;
 336         throw runtime_error("no xrandr support");
 337 #endif
 338 }
 339
 340 bool Display::process_events()
 341 {
 342         int pending = XPending(priv->display);
 343         if(pending==0)
 344                 return false;
 345
 346         for(; pending--;)
 347         {
 348                 Window::Event event;
 349                 XNextEvent(priv->display, &event.xevent);
 350
 351                 check_error();
 352
 353                 auto j = priv->windows.find(event.xevent.xany.window);
 354                 if(j!=priv->windows.end())
 355                 {
 356                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 357                         the next one is a KeyPress with the exact same parameters, they
 358                         indicate autorepeat and must be dropped. */
 359                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 360                         {
 361                                 XKeyEvent &kev = event.xevent.xkey;
 362                                 XEvent ev2;
 363                                 XPeekEvent(priv->display, &ev2);
 364                                 if(ev2.type==KeyPress)
 365                                 {
 366                                         XKeyEvent &kev2 = ev2.xkey;
 367                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 368                                         {
 369                                                 XNextEvent(priv->display, &ev2);
 370                                                 --pending;
 371                                                 continue;
 372                                         }
 373                                 }
 374                         }
 375
 376                         j->second->event(event);
 377                 }
 378         }
 379
 380         return true;
 381 }
 382
 383 void Display::check_error()
 384 {
 385         if(error_flag)
 386         {
 387                 error_flag = false;
 388                 throw runtime_error(error_msg);
 389         }
 390 }
 391
 392 } // namespace Msp
 393 } // namespace Graphics