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