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         if(!m1.desktop_settings.mode && m2.desktop_settings.mode)
  70                 return false;
  71         return m1.desktop_settings.x<m2.desktop_settings.x;
  72 }
  73 #endif
  74
  75 inline unsigned mode_width(const Msp::Graphics::VideoMode &m, Msp::Graphics::VideoRotation r)
  76 {
  77         if(r==Msp::Graphics::ROTATE_RIGHT || r==Msp::Graphics::ROTATE_LEFT)
  78                 return m.height;
  79         else
  80                 return m.width;
  81 }
  82
  83 }
  84
  85
  86 namespace Msp {
  87 namespace Graphics {
  88
  89 Display::Display(const string &disp_name):
  90         priv(new Private)
  91 {
  92         if(disp_name.empty())
  93                 priv->display = XOpenDisplay(nullptr);
  94         else
  95                 priv->display = XOpenDisplay(disp_name.c_str());
  96         if(!priv->display)
  97                 throw runtime_error("XOpenDisplay");
  98
  99         XSetErrorHandler(x_error_handler);
 100
 101         priv->root_window = DefaultRootWindow(priv->display);
 102
 103         err_dialog = new ErrorDialog(this);
 104
 105 #ifdef WITH_XRANDR
 106         int event_base;
 107         int error_base;
 108         if(XRRQueryExtension(priv->display, &event_base, &error_base))
 109         {
 110                 int major, minor;
 111                 XRRQueryVersion(priv->display, &major, &minor);
 112                 if(major>1 || (major==1 && minor>=2))
 113                 {
 114                         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 115                         RROutput primary = XRRGetOutputPrimary(priv->display, priv->root_window);
 116                         Atom edid_prop = XInternAtom(priv->display, RR_PROPERTY_RANDR_EDID, true);
 117
 118                         map<RRMode, XRRModeInfo *> modes_by_id;
 119                         for(int i=0; i<res->nmode; ++i)
 120                                 modes_by_id[res->modes[i].id] = &res->modes[i];
 121
 122                         int primary_index = -1;
 123                         vector<unsigned> mode_monitor_indices;
 124                         vector<int> desktop_mode_indices;
 125                         for(int i=0; i<res->noutput; ++i)
 126                         {
 127                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
 128                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : nullptr);
 129
 130                                 monitors.push_back(Monitor());
 131                                 Monitor &monitor = monitors.back();
 132                                 monitor.index = monitors.size()-1;
 133                                 monitor.name.assign(output->name, output->nameLen);
 134                                 priv->monitors.push_back(res->outputs[i]);
 135
 136                                 if(edid_prop)
 137                                 {
 138                                         Atom prop_type;
 139                                         int prop_format;
 140                                         unsigned long length;
 141                                         unsigned long overflow;
 142                                         unsigned char *edid = nullptr;
 143                                         XRRGetOutputProperty(priv->display, res->outputs[i], edid_prop, 0, 32, false, false, XA_INTEGER, &prop_type, &prop_format, &length, &overflow, &edid);
 144                                         if(prop_type==XA_INTEGER && prop_format==8)
 145                                         {
 146                                                 for(unsigned j=0; j<4; ++j)
 147                                                 {
 148                                                         unsigned offset = 54+j*18;
 149                                                         if(edid[offset]==0 && edid[offset+1]==0 && edid[offset+3]==0xFC)
 150                                                         {
 151                                                                 unsigned k;
 152                                                                 for(k=0; (k<13 && edid[offset+5+k]!=0x0A); ++k) ;
 153                                                                 monitor.name.assign(reinterpret_cast<char *>(edid+offset+5), k);
 154                                                         }
 155                                                 }
 156                                         }
 157                                         XFree(edid);
 158                                 }
 159
 160                                 if(crtc)
 161                                 {
 162                                         monitor.desktop_settings.rotation = rotation_from_sys(crtc->rotation);
 163                                         monitor.desktop_settings.x = crtc->x;
 164                                         monitor.desktop_settings.y = crtc->y;
 165                                 }
 166
 167                                 if(res->outputs[i]==primary)
 168                                         primary_index = monitor.index;
 169
 170                                 unsigned first_mode = modes.size();
 171                                 int desktop_mode_index = -1;
 172                                 for(int j=0; j<output->nmode; ++j)
 173                                 {
 174                                         auto k = modes_by_id.find(output->modes[j]);
 175                                         if(k==modes_by_id.end())
 176                                                 continue;
 177
 178                                         XRRModeInfo *info = k->second;
 179                                         float rate = static_cast<float>(info->dotClock)/(info->hTotal*info->vTotal);
 180
 181                                         if(any_of(modes.begin()+first_mode, modes.end(), [&info, rate](const VideoMode &m){
 182                                                         return (m.width==info->width && m.height==info->height && abs(m.rate-rate)<0.01f);
 183                                                 }))
 184                                                 continue;
 185
 186                                         VideoMode mode(info->width, info->height);
 187                                         mode.index = modes.size();
 188                                         mode.rate = rate;
 189
 190                                         modes.push_back(mode);
 191                                         priv->modes.push_back(info->id);
 192                                         mode_monitor_indices.push_back(monitor.index);
 193
 194                                         if(crtc && info->id==crtc->mode)
 195                                                 desktop_mode_index = mode.index;
 196                                 }
 197                                 desktop_mode_indices.push_back(desktop_mode_index);
 198
 199                                 XRRFreeOutputInfo(output);
 200                                 if(crtc)
 201                                         XRRFreeCrtcInfo(crtc);
 202                         }
 203
 204                         XRRFreeScreenResources(res);
 205
 206                         for(unsigned i=0; i<monitors.size(); ++i)
 207                         {
 208                                 int j = desktop_mode_indices[i];
 209                                 if(j>=0)
 210                                         monitors[i].desktop_settings.mode = &modes[j];
 211                                 monitors[i].current_settings = monitors[i].desktop_settings;
 212                         }
 213
 214                         sort(monitors, monitor_x_compare);
 215
 216                         for(unsigned i=0; i<modes.size(); ++i)
 217                         {
 218                                 auto j = find_member(monitors, mode_monitor_indices[i], &Monitor::index);
 219                                 modes[i].monitor = &*j;
 220                                 j->video_modes.push_back(&modes[i]);
 221                         }
 222
 223                         Monitor *prev_enabled = nullptr;
 224                         for(Monitor &m: monitors)
 225                                 if(m.desktop_settings.mode)
 226                                 {
 227                                         m.next_left = prev_enabled;
 228                                         if(prev_enabled)
 229                                                 prev_enabled->next_right = &m;
 230                                         prev_enabled = &m;
 231                                 }
 232
 233                         if(primary_index>=0)
 234                                 primary_monitor = &*find_member(monitors, static_cast<unsigned>(primary_index), &Monitor::index);
 235
 236                         if(!primary_monitor || !primary_monitor->desktop_settings.mode)
 237                         {
 238                                 // XRandR didn't give a sensible primary monitor.  Try to guess one.
 239                                 unsigned largest = 0;
 240                                 for(Monitor &m: monitors)
 241                                         if(const VideoMode *desktop_mode = m.desktop_settings.mode)
 242                                         {
 243                                                 unsigned size = desktop_mode->width*desktop_mode->height;
 244                                                 if(size>largest)
 245                                                 {
 246                                                         largest = size;
 247                                                         primary_monitor = &m;
 248                                                 }
 249                                         }
 250                         }
 251                 }
 252         }
 253 #endif
 254 }
 255
 256 Display::~Display()
 257 {
 258         XCloseDisplay(priv->display);
 259         delete priv;
 260         delete err_dialog;
 261 }
 262
 263 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 264 {
 265 #ifdef WITH_XRANDR
 266         const VideoMode *mode = find_mode(requested_mode);
 267         if(!mode)
 268                 throw unsupported_video_mode(requested_mode);
 269
 270         VideoRotation requested_rotation = requested_mode.rotation;
 271         if(requested_rotation==ROTATE_ANY)
 272                 requested_rotation = mode->monitor->desktop_settings.rotation;
 273
 274         XRRScreenResources *res = XRRGetScreenResources(priv->display, priv->root_window);
 275         RROutput output = priv->monitors[mode->monitor->index];
 276         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 277
 278         // Check if the output already has a CRTC and find a free one if it doesn't
 279         RRCrtc crtc = output_info->crtc;
 280         XRRCrtcInfo *crtc_info = nullptr;
 281         if(crtc)
 282                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 283         else
 284         {
 285                 for(int i=0; i<res->ncrtc; ++i)
 286                 {
 287                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 288                         if(!crtc_info->noutput)
 289                         {
 290                                 crtc = res->crtcs[i];
 291                                 break;
 292                         }
 293                         XRRFreeCrtcInfo(crtc_info);
 294                 }
 295
 296                 if(!crtc)
 297                 {
 298                         XRRFreeOutputInfo(output_info);
 299                         throw unsupported_video_mode(requested_mode);
 300                 }
 301         }
 302
 303         /* Due to the semantics of find_mode, the mode's monitor pointer must point
 304         to one of the elements of the monitors list, which is non-const here. */
 305         Monitor *monitor = const_cast<Monitor *>(mode->monitor);
 306
 307         if(exclusive)
 308         {
 309                 monitor->current_settings.mode = mode;
 310                 monitor->current_settings.rotation = requested_rotation;
 311                 monitor->current_settings.x = 0;
 312                 monitor->current_settings.y = 0;
 313
 314                 // Disable other outputs for exclusive mode
 315                 for(Monitor &m: monitors)
 316                         if(&m!=mode->monitor)
 317                         {
 318                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[m.index]);
 319                                 if(o->crtc)
 320                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, nullptr, 0);
 321                                 XRRFreeOutputInfo(o);
 322
 323                                 m.current_settings.mode = nullptr;
 324                                 m.current_settings.rotation = ROTATE_NORMAL;
 325                                 m.current_settings.x = 0;
 326                                 m.current_settings.y = 0;
 327                         }
 328         }
 329         else
 330         {
 331                 monitor->current_settings.x = monitor->desktop_settings.x;
 332                 monitor->current_settings.y = monitor->desktop_settings.y;
 333         }
 334
 335         RRMode mode_id = priv->modes[mode->index];
 336         int x = monitor->current_settings.x;
 337         int y = monitor->current_settings.y;
 338         Rotation sys_rot = rotation_to_sys(requested_rotation);
 339         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, x, y, mode_id, sys_rot, &output, 1);
 340
 341         XRRFreeOutputInfo(output_info);
 342         XRRFreeCrtcInfo(crtc_info);
 343         XRRFreeScreenResources(res);
 344 #else
 345         (void)requested_mode;
 346         (void)exclusive;
 347         throw runtime_error("no xrandr support");
 348 #endif
 349 }
 350
 351 bool Display::process_events()
 352 {
 353         int pending = XPending(priv->display);
 354         if(pending==0)
 355                 return false;
 356
 357         for(; pending--;)
 358         {
 359                 Window::Event event;
 360                 XNextEvent(priv->display, &event.xevent);
 361
 362                 check_error();
 363
 364                 auto j = priv->windows.find(event.xevent.xany.window);
 365                 if(j!=priv->windows.end())
 366                 {
 367                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 368                         the next one is a KeyPress with the exact same parameters, they
 369                         indicate autorepeat and must be dropped. */
 370                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 371                         {
 372                                 XKeyEvent &kev = event.xevent.xkey;
 373                                 XEvent ev2;
 374                                 XPeekEvent(priv->display, &ev2);
 375                                 if(ev2.type==KeyPress)
 376                                 {
 377                                         XKeyEvent &kev2 = ev2.xkey;
 378                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 379                                         {
 380                                                 XNextEvent(priv->display, &ev2);
 381                                                 --pending;
 382                                                 continue;
 383                                         }
 384                                 }
 385                         }
 386
 387                         j->second->event(event);
 388                 }
 389         }
 390
 391         return true;
 392 }
 393
 394 void Display::check_error()
 395 {
 396         if(error_flag)
 397         {
 398                 error_flag = false;
 399                 throw runtime_error(error_msg);
 400         }
 401 }
 402
 403 } // namespace Msp
 404 } // namespace Graphics