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 inline unsigned mode_width(const Msp::Graphics::VideoMode &m, Msp::Graphics::VideoRotation r)
  67 {
  68         if(r==Msp::Graphics::ROTATE_RIGHT || r==Msp::Graphics::ROTATE_LEFT)
  69                 return m.height;
  70         else
  71                 return m.width;
  72 }
  73
  74 }
  75
  76
  77 namespace Msp {
  78 namespace Graphics {
  79
  80 Display::Display(const string &disp_name):
  81         priv(new Private)
  82 {
  83         if(disp_name.empty())
  84                 priv->display = XOpenDisplay(nullptr);
  85         else
  86                 priv->display = XOpenDisplay(disp_name.c_str());
  87         if(!priv->display)
  88                 throw runtime_error("XOpenDisplay");
  89
  90         XSetErrorHandler(x_error_handler);
  91
  92         priv->root_window = DefaultRootWindow(priv->display);
  93
  94         err_dialog = new ErrorDialog(this);
  95
  96 #ifdef WITH_XRANDR
  97         int event_base;
  98         int error_base;
  99         if(XRRQueryExtension(priv->display, &event_base, &error_base))
 100         {
 101                 int major, minor;
 102                 XRRQueryVersion(priv->display, &major, &minor);
 103                 if(major>1 || (major==1 && minor>=2))
 104                 {
 105                         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 106                         RROutput primary = XRRGetOutputPrimary(priv->display, priv->root_window);
 107                         Atom edid_prop = XInternAtom(priv->display, RR_PROPERTY_RANDR_EDID, true);
 108
 109                         map<RRMode, XRRModeInfo *> modes_by_id;
 110                         for(int i=0; i<res->nmode; ++i)
 111                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 112
 113                         int primary_index = -1;
 114                         vector<unsigned> mode_monitor_indices;
 115                         vector<int> desktop_mode_indices;
 116                         for(int i=0; i<res->noutput; ++i)
 117                         {
 118                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 119                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : nullptr);
 120
 121                                 monitors.push_back(Monitor());
 122                                 Monitor &monitor = monitors.back();
 123                                 monitor.index = monitors.size()-1;
 124                                 monitor.name.assign(output->name, output->nameLen);
 125                                 priv->monitors.push_back(res->outputs[i]);
 126
 127                                 if(edid_prop)
 128                                 {
 129                                         Atom prop_type;
 130                                         int prop_format;
 131                                         unsigned long length;
 132                                         unsigned long overflow;
 133                                         unsigned char *edid = nullptr;
 134                                         XRRGetOutputProperty(priv->display, res->outputs[i], edid_prop, 0, 32, false, false, XA_INTEGER, &prop_type, &prop_format, &length, &overflow, &edid);
 135                                         if(prop_type==XA_INTEGER && prop_format==8)
 136                                         {
 137                                                 for(unsigned j=0; j<4; ++j)
 138                                                 {
 139                                                         unsigned offset = 54+j*18;
 140                                                         if(edid[offset]==0 && edid[offset+1]==0 && edid[offset+3]==0xFC)
 141                                                         {
 142                                                                 unsigned k;
 143                                                                 for(k=0; (k<13 && edid[offset+5+k]!=0x0A); ++k) ;
 144                                                                 monitor.name.assign(reinterpret_cast<char *>(edid+offset+5), k);
 145                                                         }
 146                                                 }
 147                                         }
 148                                         XFree(edid);
 149                                 }
 150
 151                                 if(crtc)
 152                                 {
 153                                         monitor.desktop_settings.rotation = rotation_from_sys(crtc->rotation);
 154                                         monitor.desktop_settings.x = crtc->x;
 155                                         monitor.desktop_settings.y = crtc->y;
 156                                 }
 157
 158                                 if(res->outputs[i]==primary)
 159                                         primary_index = monitor.index;
 160
 161                                 unsigned first_mode = modes.size();
 162                                 int desktop_mode_index = -1;
 163                                 for(int j=0; j<output->nmode; ++j)
 164                                 {
 165                                         auto k = modes_by_id.find(output->modes[j]);
 166                                         if(k==modes_by_id.end())
 167                                                 continue;
 168
 169                                         XRRModeInfo *info = k->second;
 170                                         float rate = static_cast<float>(info->dotClock)/(info->hTotal*info->vTotal);
 171
 172                                         if(any_of(modes.begin()+first_mode, modes.end(), [&info, rate](const VideoMode &m){
 173                                                         return (m.width==info->width && m.height==info->height && abs(m.rate-rate)<0.01f);
 174                                                 }))
 175                                                 continue;
 176
 177                                         VideoMode mode(info->width, info->height);
 178                                         mode.index = modes.size();
 179                                         mode.rate = rate;
 180
 181                                         modes.push_back(mode);
 182                                         priv->modes.push_back(info->id);
 183                                         mode_monitor_indices.push_back(monitor.index);
 184
 185                                         if(crtc && info->id==crtc->mode)
 186                                                 desktop_mode_index = mode.index;
 187                                 }
 188                                 desktop_mode_indices.push_back(desktop_mode_index);
 189
 190                                 XRRFreeOutputInfo(output);
 191                                 if(crtc)
 192                                         XRRFreeCrtcInfo(crtc);
 193                         }
 194
 195                         XRRFreeScreenResources(res);
 196
 197                         for(unsigned i=0; i<monitors.size(); ++i)
 198                         {
 199                                 int j = desktop_mode_indices[i];
 200                                 if(j>=0)
 201                                         monitors[i].desktop_settings.mode = &modes[j];
 202                                 monitors[i].current_settings = monitors[i].desktop_settings;
 203                         }
 204
 205                         sort(monitors, [](const Msp::Graphics::Monitor &m1, const Msp::Graphics::Monitor &m2){
 206                                 if(m1.desktop_settings.mode && !m2.desktop_settings.mode)
 207                                         return true;
 208                                 if(!m1.desktop_settings.mode && m2.desktop_settings.mode)
 209                                         return false;
 210                                 return m1.desktop_settings.x<m2.desktop_settings.x;
 211                         });
 212
 213                         for(unsigned i=0; i<modes.size(); ++i)
 214                         {
 215                                 auto j = find_member(monitors, mode_monitor_indices[i], &Monitor::index);
 216                                 modes[i].monitor = &*j;
 217                                 j->video_modes.push_back(&modes[i]);
 218                         }
 219
 220                         Monitor *prev_enabled = nullptr;
 221                         for(Monitor &m: monitors)
 222                                 if(m.desktop_settings.mode)
 223                                 {
 224                                         m.next_left = prev_enabled;
 225                                         if(prev_enabled)
 226                                                 prev_enabled->next_right = &m;
 227                                         prev_enabled = &m;
 228                                 }
 229
 230                         if(primary_index>=0)
 231                                 primary_monitor = &*find_member(monitors, static_cast<unsigned>(primary_index), &Monitor::index);
 232
 233                         if(!primary_monitor || !primary_monitor->desktop_settings.mode)
 234                         {
 235                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 236                                 unsigned largest = 0;
 237                                 for(Monitor &m: monitors)
 238                                         if(const VideoMode *desktop_mode = m.desktop_settings.mode)
 239                                         {
 240                                                 unsigned size = desktop_mode->width*desktop_mode->height;
 241                                                 if(size>largest)
 242                                                 {
 243                                                         largest = size;
 244                                                         primary_monitor = &m;
 245                                                 }
 246                                         }
 247                         }
 248                 }
 249         }
 250 #endif
 251 }
 252
 253 Display::~Display()
 254 {
 255         XCloseDisplay(priv->display);
 256         delete priv;
 257         delete err_dialog;
 258 }
 259
 260 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 261 {
 262 #ifdef WITH_XRANDR
 263         const VideoMode *mode = find_mode(requested_mode);
 264         if(!mode)
 265                 throw unsupported_video_mode(requested_mode);
 266
 267         VideoRotation requested_rotation = requested_mode.rotation;
 268         if(requested_rotation==ROTATE_ANY)
 269                 requested_rotation = mode->monitor->desktop_settings.rotation;
 270
 271         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 272         RROutput output = priv->monitors[mode->monitor->index];
 273         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 274
 275         // Check if the output already has a CRTC and find a free one if it doesn't
 276         RRCrtc crtc = output_info->crtc;
 277         XRRCrtcInfo *crtc_info = nullptr;
 278         if(crtc)
 279                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 280         else
 281         {
 282                 for(int i=0; i<res->ncrtc; ++i)
 283                 {
 284                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 285                         if(!crtc_info->noutput)
 286                         {
 287                                 crtc = res->crtcs[i];
 288                                 break;
 289                         }
 290                         XRRFreeCrtcInfo(crtc_info);
 291                 }
 292
 293                 if(!crtc)
 294                 {
 295                         XRRFreeOutputInfo(output_info);
 296                         throw unsupported_video_mode(requested_mode);
 297                 }
 298         }
 299
 300         /* Due to the semantics of find_mode, the mode's monitor pointer must point
 301         to one of the elements of the monitors list, which is non-const here. */
 302         Monitor *monitor = const_cast<Monitor *>(mode->monitor);
 303
 304         if(exclusive)
 305         {
 306                 monitor->current_settings.mode = mode;
 307                 monitor->current_settings.rotation = requested_rotation;
 308                 monitor->current_settings.x = 0;
 309                 monitor->current_settings.y = 0;
 310
 311                 // Disable other outputs for exclusive mode
 312                 for(Monitor &m: monitors)
 313                         if(&m!=mode->monitor)
 314                         {
 315                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[m.index]);
 316                                 if(o->crtc)
 317                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, nullptr, 0);
 318                                 XRRFreeOutputInfo(o);
 319
 320                                 m.current_settings.mode = nullptr;
 321                                 m.current_settings.rotation = ROTATE_NORMAL;
 322                                 m.current_settings.x = 0;
 323                                 m.current_settings.y = 0;
 324                         }
 325         }
 326         else
 327         {
 328                 monitor->current_settings.x = monitor->desktop_settings.x;
 329                 monitor->current_settings.y = monitor->desktop_settings.y;
 330         }
 331
 332         RRMode mode_id = priv->modes[mode->index];
 333         int x = monitor->current_settings.x;
 334         int y = monitor->current_settings.y;
 335         Rotation sys_rot = rotation_to_sys(requested_rotation);
 336         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, mode_id, sys_rot, &output, 1);
 337
 338         XRRFreeOutputInfo(output_info);
 339         XRRFreeCrtcInfo(crtc_info);
 340         XRRFreeScreenResources(res);
 341 #else
 342         (void)requested_mode;
 343         (void)exclusive;
 344         throw runtime_error("no xrandr support");
 345 #endif
 346 }
 347
 348 bool Display::process_events()
 349 {
 350         int pending = XPending(priv->display);
 351         if(pending==0)
 352                 return false;
 353
 354         for(; pending--;)
 355         {
 356                 Window::Event event;
 357                 XNextEvent(priv->display, &event.xevent);
 358
 359                 check_error();
 360
 361                 auto j = priv->windows.find(event.xevent.xany.window);
 362                 if(j!=priv->windows.end())
 363                 {
 364                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 365                         the next one is a KeyPress with the exact same parameters, they
 366                         indicate autorepeat and must be dropped. */
 367                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 368                         {
 369                                 XKeyEvent &kev = event.xevent.xkey;
 370                                 XEvent ev2;
 371                                 XPeekEvent(priv->display, &ev2);
 372                                 if(ev2.type==KeyPress)
 373                                 {
 374                                         XKeyEvent &kev2 = ev2.xkey;
 375                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 376                                         {
 377                                                 XNextEvent(priv->display, &ev2);
 378                                                 --pending;
 379                                                 continue;
 380                                         }
 381                                 }
 382                         }
 383
 384                         j->second->event(event);
 385                 }
 386         }
 387
 388         return true;
 389 }
 390
 391 void Display::check_error()
 392 {
 393         if(error_flag)
 394         {
 395                 error_flag = false;
 396                 throw runtime_error(error_msg);
 397         }
 398 }
 399
 400 } // namespace Msp
 401 } // namespace Graphics