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
  65 inline bool monitor_x_compare(const Msp::Graphics::Monitor &m1, const Msp::Graphics::Monitor &m2)
  66 {
  67         if(m1.desktop_settings.mode && !m2.desktop_settings.mode)
  68                 return true;
  69         return m1.desktop_settings.x<m2.desktop_settings.x;
  70 }
  71 #endif
  72
  73 inline unsigned mode_width(const Msp::Graphics::VideoMode &m, Msp::Graphics::VideoRotation r)
  74 {
  75         if(r==Msp::Graphics::ROTATE_RIGHT || r==Msp::Graphics::ROTATE_LEFT)
  76                 return m.height;
  77         else
  78                 return m.width;
  79 }
  80
  81 }
  82
  83
  84 namespace Msp {
  85 namespace Graphics {
  86
  87 Display::Display(const string &disp_name):
  88         priv(new Private)
  89 {
  90         if(disp_name.empty())
  91                 priv->display = XOpenDisplay(nullptr);
  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         priv->root_window = DefaultRootWindow(priv->display);
 100
 101         err_dialog = new ErrorDialog(this);
 102
 103 #ifdef WITH_XRANDR
 104         int event_base;
 105         int error_base;
 106         if(XRRQueryExtension(priv->display, &event_base, &error_base))
 107         {
 108                 int major, minor;
 109                 XRRQueryVersion(priv->display, &major, &minor);
 110                 if(major>1 || (major==1 && minor>=2))
 111                 {
 112                         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 113                         RROutput primary = XRRGetOutputPrimary(priv->display, priv->root_window);
 114                         Atom edid_prop = XInternAtom(priv->display, RR_PROPERTY_RANDR_EDID, true);
 115
 116                         map<RRMode, XRRModeInfo *> modes_by_id;
 117                         for(int i=0; i<res->nmode; ++i)
 118                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 119
 120                         int primary_index = -1;
 121                         vector<unsigned> mode_monitor_indices;
 122                         vector<int> desktop_mode_indices;
 123                         for(int i=0; i<res->noutput; ++i)
 124                         {
 125                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 126                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : nullptr);
 127
 128                                 monitors.push_back(Monitor());
 129                                 Monitor &monitor = monitors.back();
 130                                 monitor.index = monitors.size()-1;
 131                                 monitor.name.assign(output->name, output->nameLen);
 132                                 priv->monitors.push_back(res->outputs[i]);
 133
 134                                 if(edid_prop)
 135                                 {
 136                                         Atom prop_type;
 137                                         int prop_format;
 138                                         unsigned long length;
 139                                         unsigned long overflow;
 140                                         unsigned char *edid = nullptr;
 141                                         XRRGetOutputProperty(priv->display, res->outputs[i], edid_prop, 0, 32, false, false, XA_INTEGER, &prop_type, &prop_format, &length, &overflow, &edid);
 142                                         if(prop_type==XA_INTEGER && prop_format==8)
 143                                         {
 144                                                 for(unsigned j=0; j<4; ++j)
 145                                                 {
 146                                                         unsigned offset = 54+j*18;
 147                                                         if(edid[offset]==0 && edid[offset+1]==0 && edid[offset+3]==0xFC)
 148                                                         {
 149                                                                 unsigned k;
 150                                                                 for(k=0; (k<13 && edid[offset+5+k]!=0x0A); ++k) ;
 151                                                                 monitor.name.assign(reinterpret_cast<char *>(edid+offset+5), k);
 152                                                         }
 153                                                 }
 154                                         }
 155                                         XFree(edid);
 156                                 }
 157
 158                                 if(crtc)
 159                                 {
 160                                         monitor.desktop_settings.rotation = rotation_from_sys(crtc->rotation);
 161                                         monitor.desktop_settings.x = crtc->x;
 162                                         monitor.desktop_settings.y = crtc->y;
 163                                 }
 164
 165                                 if(res->outputs[i]==primary)
 166                                         primary_index = monitor.index;
 167
 168                                 unsigned first_mode = modes.size();
 169                                 int desktop_mode_index = -1;
 170                                 for(int j=0; j<output->nmode; ++j)
 171                                 {
 172                                         auto k = modes_by_id.find(output->modes[j]);
 173                                         if(k==modes_by_id.end())
 174                                                 continue;
 175
 176                                         XRRModeInfo *info = k->second;
 177                                         float rate = static_cast<float>(info->dotClock)/(info->hTotal*info->vTotal);
 178
 179                                         if(any_of(modes.begin()+first_mode, modes.end(), [&info, rate](const VideoMode &m){
 180                                                         return (m.width==info->width && m.height==info->height && abs(m.rate-rate)<0.01f);
 181                                                 }))
 182                                                 continue;
 183
 184                                         VideoMode mode(info->width, info->height);
 185                                         mode.index = modes.size();
 186                                         mode.rate = rate;
 187
 188                                         modes.push_back(mode);
 189                                         priv->modes.push_back(info->id);
 190                                         mode_monitor_indices.push_back(monitor.index);
 191
 192                                         if(crtc && info->id==crtc->mode)
 193                                                 desktop_mode_index = mode.index;
 194                                 }
 195                                 desktop_mode_indices.push_back(desktop_mode_index);
 196
 197                                 XRRFreeOutputInfo(output);
 198                                 if(crtc)
 199                                         XRRFreeCrtcInfo(crtc);
 200                         }
 201
 202                         XRRFreeScreenResources(res);
 203
 204                         for(unsigned i=0; i<monitors.size(); ++i)
 205                         {
 206                                 int j = desktop_mode_indices[i];
 207                                 if(j>=0)
 208                                         monitors[i].desktop_settings.mode = &modes[j];
 209                                 monitors[i].current_settings = monitors[i].desktop_settings;
 210                         }
 211
 212                         sort(monitors, monitor_x_compare);
 213
 214                         for(unsigned i=0; i<modes.size(); ++i)
 215                         {
 216                                 auto j = find_member(monitors, mode_monitor_indices[i], &Monitor::index);
 217                                 modes[i].monitor = &*j;
 218                                 j->video_modes.push_back(&modes[i]);
 219                         }
 220
 221                         Monitor *prev_enabled = nullptr;
 222                         for(Monitor &m: monitors)
 223                                 if(m.desktop_settings.mode)
 224                                 {
 225                                         m.next_left = prev_enabled;
 226                                         if(prev_enabled)
 227                                                 prev_enabled->next_right = &m;
 228                                         prev_enabled = &m;
 229                                 }
 230
 231                         if(primary_index>=0)
 232                                 primary_monitor = &*find_member(monitors, static_cast<unsigned>(primary_index), &Monitor::index);
 233
 234                         if(!primary_monitor || !primary_monitor->desktop_settings.mode)
 235                         {
 236                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 237                                 unsigned largest = 0;
 238                                 for(Monitor &m: monitors)
 239                                         if(const VideoMode *desktop_mode = m.desktop_settings.mode)
 240                                         {
 241                                                 unsigned size = desktop_mode->width*desktop_mode->height;
 242                                                 if(size>largest)
 243                                                 {
 244                                                         largest = size;
 245                                                         primary_monitor = &m;
 246                                                 }
 247                                         }
 248                         }
 249                 }
 250         }
 251 #endif
 252 }
 253
 254 Display::~Display()
 255 {
 256         XCloseDisplay(priv->display);
 257         delete priv;
 258         delete err_dialog;
 259 }
 260
 261 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 262 {
 263 #ifdef WITH_XRANDR
 264         const VideoMode *mode = find_mode(requested_mode);
 265         if(!mode)
 266                 throw unsupported_video_mode(requested_mode);
 267
 268         VideoRotation requested_rotation = requested_mode.rotation;
 269         if(requested_rotation==ROTATE_ANY)
 270                 requested_rotation = mode->monitor->desktop_settings.rotation;
 271
 272         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 273         RROutput output = priv->monitors[mode->monitor->index];
 274         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 275
 276         // Check if the output already has a CRTC and find a free one if it doesn't
 277         RRCrtc crtc = output_info->crtc;
 278         XRRCrtcInfo *crtc_info = nullptr;
 279         if(crtc)
 280                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 281         else
 282         {
 283                 for(int i=0; i<res->ncrtc; ++i)
 284                 {
 285                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 286                         if(!crtc_info->noutput)
 287                         {
 288                                 crtc = res->crtcs[i];
 289                                 break;
 290                         }
 291                         XRRFreeCrtcInfo(crtc_info);
 292                 }
 293
 294                 if(!crtc)
 295                 {
 296                         XRRFreeOutputInfo(output_info);
 297                         throw unsupported_video_mode(requested_mode);
 298                 }
 299         }
 300
 301         /* Due to the semantics of find_mode, the mode's monitor pointer must point
 302         to one of the elements of the monitors list, which is non-const here. */
 303         Monitor *monitor = const_cast<Monitor *>(mode->monitor);
 304
 305         if(exclusive)
 306         {
 307                 monitor->current_settings.mode = mode;
 308                 monitor->current_settings.rotation = requested_rotation;
 309                 monitor->current_settings.x = 0;
 310                 monitor->current_settings.y = 0;
 311
 312                 // Disable other outputs for exclusive mode
 313                 for(Monitor &m: monitors)
 314                         if(&m!=mode->monitor)
 315                         {
 316                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[m.index]);
 317                                 if(o->crtc)
 318                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, nullptr, 0);
 319                                 XRRFreeOutputInfo(o);
 320
 321                                 m.current_settings.mode = nullptr;
 322                                 m.current_settings.rotation = ROTATE_NORMAL;
 323                                 m.current_settings.x = 0;
 324                                 m.current_settings.y = 0;
 325                         }
 326         }
 327         else
 328         {
 329                 monitor->current_settings.x = monitor->desktop_settings.x;
 330                 monitor->current_settings.y = monitor->desktop_settings.y;
 331         }
 332
 333         RRMode mode_id = priv->modes[mode->index];
 334         int x = monitor->current_settings.x;
 335         int y = monitor->current_settings.y;
 336         Rotation sys_rot = rotation_to_sys(requested_rotation);
 337         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, mode_id, sys_rot, &output, 1);
 338
 339         XRRFreeOutputInfo(output_info);
 340         XRRFreeCrtcInfo(crtc_info);
 341         XRRFreeScreenResources(res);
 342 #else
 343         (void)requested_mode;
 344         (void)exclusive;
 345         throw runtime_error("no xrandr support");
 346 #endif
 347 }
 348
 349 bool Display::process_events()
 350 {
 351         int pending = XPending(priv->display);
 352         if(pending==0)
 353                 return false;
 354
 355         for(; pending--;)
 356         {
 357                 Window::Event event;
 358                 XNextEvent(priv->display, &event.xevent);
 359
 360                 check_error();
 361
 362                 auto j = priv->windows.find(event.xevent.xany.window);
 363                 if(j!=priv->windows.end())
 364                 {
 365                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 366                         the next one is a KeyPress with the exact same parameters, they
 367                         indicate autorepeat and must be dropped. */
 368                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 369                         {
 370                                 XKeyEvent &kev = event.xevent.xkey;
 371                                 XEvent ev2;
 372                                 XPeekEvent(priv->display, &ev2);
 373                                 if(ev2.type==KeyPress)
 374                                 {
 375                                         XKeyEvent &kev2 = ev2.xkey;
 376                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 377                                         {
 378                                                 XNextEvent(priv->display, &ev2);
 379                                                 --pending;
 380                                                 continue;
 381                                         }
 382                                 }
 383                         }
 384
 385                         j->second->event(event);
 386                 }
 387         }
 388
 389         return true;
 390 }
 391
 392 void Display::check_error()
 393 {
 394         if(error_flag)
 395         {
 396                 error_flag = false;
 397                 throw runtime_error(error_msg);
 398         }
 399 }
 400
 401 } // namespace Msp
 402 } // namespace Graphics