source/graphics/x11/display.cpp

   1 #include <iostream>
   2 #include <X11/Xlib.h>
   3 #ifdef WITH_XRANDR
   4 #include <X11/extensions/Xrandr.h>
   5 #endif
   6 #include <msp/io/print.h>
   7 #include <msp/strings/format.h>
   8 #include <msp/strings/lexicalcast.h>
   9 #include "display.h"
  10 #include "display_private.h"
  11
  12 using namespace std;
  13
  14 namespace {
  15
  16 bool error_flag = false;
  17 std::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 }
  42
  43
  44 namespace Msp {
  45 namespace Graphics {
  46
  47 Display::Display(const string &disp_name):
  48         primary_monitor(0),
  49         priv(new Private)
  50 {
  51         if(disp_name.empty())
  52                 priv->display = XOpenDisplay(0);
  53         else
  54                 priv->display = XOpenDisplay(disp_name.c_str());
  55         if(!priv->display)
  56                 throw runtime_error("XOpenDisplay");
  57
  58         XSetErrorHandler(x_error_handler);
  59
  60 #ifdef WITH_XRANDR
  61         int event_base;
  62         int error_base;
  63         if(XRRQueryExtension(priv->display, &event_base, &error_base))
  64         {
  65                 int major, minor;
  66                 XRRQueryVersion(priv->display, &major, &minor);
  67                 if(major>1 || (major==1 && minor>=2))
  68                 {
  69                         WindowHandle root = DefaultRootWindow(priv->display);
  70                         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
  71                         RROutput primary = XRRGetOutputPrimary(priv->display, root);
  72
  73                         map<RRMode, XRRModeInfo *> modes_by_id;
  74                         for(int i=0; i<res->nmode; ++i)
  75                                 modes_by_id[res->modes[i].id] = &res->modes[i];
  76
  77                         for(int i=0; i<res->noutput; ++i)
  78                         {
  79                                 XRROutputInfo *output = XRRGetOutputInfo(priv->display, res, res->outputs[i]);
  80                                 XRRCrtcInfo *crtc = (output->crtc ? XRRGetCrtcInfo(priv->display, res, output->crtc) : 0);
  81
  82                                 monitors.push_back(Monitor());
  83                                 Monitor &monitor = monitors.back();
  84                                 monitor.index = monitors.size()-1;
  85                                 priv->monitors.push_back(res->outputs[i]);
  86
  87                                 if(res->outputs[i]==primary)
  88                                         primary_monitor = &monitor;
  89
  90                                 for(int j=0; j<output->nmode; ++j)
  91                                 {
  92                                         map<RRMode, XRRModeInfo *>::iterator k = modes_by_id.find(output->modes[j]);
  93                                         if(k==modes_by_id.end())
  94                                                 continue;
  95
  96                                         XRRModeInfo *info = k->second;
  97
  98                                         VideoMode mode(info->width, info->height);
  99                                         mode.index = modes.size();
 100                                         mode.monitor = &monitor;
 101                                         mode.rate = info->dotClock/(info->hTotal*info->vTotal);
 102                                         if(find_matching_mode(mode))
 103                                                 continue;
 104
 105                                         modes.push_back(mode);
 106                                         priv->modes.push_back(info->id);
 107                                         monitor.video_modes.push_back(&modes.back());
 108
 109                                         if(crtc && info->id==crtc->mode)
 110                                                 monitor.desktop_mode = &modes.back();
 111                                 }
 112
 113                                 XRRFreeOutputInfo(output);
 114                                 if(crtc)
 115                                         XRRFreeCrtcInfo(crtc);
 116                         }
 117
 118                         XRRFreeScreenResources(res);
 119                 }
 120         }
 121 #endif
 122 }
 123
 124 Display::~Display()
 125 {
 126         XCloseDisplay(priv->display);
 127         delete priv;
 128 }
 129
 130 void Display::set_mode(const VideoMode &requested_mode, bool exclusive)
 131 {
 132 #ifdef WITH_XRANDR
 133         const VideoMode *mode = find_matching_mode(requested_mode);
 134         if(!mode)
 135                 throw unsupported_video_mode(requested_mode);
 136
 137         WindowHandle root = DefaultRootWindow(priv->display);
 138         XRRScreenResources *res = XRRGetScreenResources(priv->display, root);
 139         RROutput output = priv->monitors[mode->monitor->index];
 140         XRROutputInfo *output_info = XRRGetOutputInfo(priv->display, res, output);
 141
 142         // Check if the output already has a CRTC and find a free one if it doesn't
 143         RRCrtc crtc = output_info->crtc;
 144         XRRCrtcInfo *crtc_info = 0;
 145         if(crtc)
 146                 crtc_info = XRRGetCrtcInfo(priv->display, res, crtc);
 147         else
 148         {
 149                 for(int i=0; i<res->ncrtc; ++i)
 150                 {
 151                         crtc_info = XRRGetCrtcInfo(priv->display, res, res->crtcs[i]);
 152                         if(!crtc_info->noutput)
 153                         {
 154                                 crtc = res->crtcs[i];
 155                                 break;
 156                         }
 157                         XRRFreeCrtcInfo(crtc_info);
 158                 }
 159
 160                 if(!crtc)
 161                 {
 162                         XRRFreeOutputInfo(output_info);
 163                         throw unsupported_video_mode(requested_mode);
 164                 }
 165         }
 166
 167         if(exclusive)
 168         {
 169                 // Disable other outputs for exclusive mode
 170                 for(unsigned i=0; i<priv->monitors.size(); ++i)
 171                         if(i!=mode->monitor->index)
 172                         {
 173                                 XRROutputInfo *o = XRRGetOutputInfo(priv->display, res, priv->monitors[i]);
 174                                 if(o->crtc)
 175                                         XRRSetCrtcConfig(priv->display, res, o->crtc, CurrentTime, 0, 0, 0, RR_Rotate_0, 0, 0);
 176                                 XRRFreeOutputInfo(o);
 177                         }
 178         }
 179
 180         XRRSetCrtcConfig(priv->display, res, crtc, CurrentTime, 0, 0, priv->modes[mode->index], RR_Rotate_0, &output, 1);
 181
 182         XRRFreeOutputInfo(output_info);
 183         XRRFreeCrtcInfo(crtc_info);
 184         XRRFreeScreenResources(res);
 185 #else
 186         (void)requested_mode;
 187         (void)exclusive;
 188         throw runtime_error("no xrandr support");
 189 #endif
 190 }
 191
 192 bool Display::process_events()
 193 {
 194         int pending = XPending(priv->display);
 195         if(pending==0)
 196                 return false;
 197
 198         for(; pending--;)
 199         {
 200                 Window::Event event;
 201                 XNextEvent(priv->display, &event.xevent);
 202
 203                 check_error();
 204
 205                 map<WindowHandle, Window *>::iterator j = priv->windows.find(event.xevent.xany.window);
 206                 if(j!=priv->windows.end())
 207                 {
 208                         /* Filter keyboard autorepeat.  If this packet is a KeyRelease and
 209                         the next one is a KeyPress with the exact same parameters, they
 210                         indicate autorepeat and must be dropped. */
 211                         if(event.xevent.type==KeyRelease && !j->second->get_keyboard_autorepeat() && pending>0)
 212                         {
 213                                 XKeyEvent &kev = event.xevent.xkey;
 214                                 XEvent ev2;
 215                                 XPeekEvent(priv->display, &ev2);
 216                                 if(ev2.type==KeyPress)
 217                                 {
 218                                         XKeyEvent &kev2 = ev2.xkey;
 219                                         if(kev2.window==kev.window && kev2.time==kev.time && kev2.keycode==kev.keycode)
 220                                         {
 221                                                 XNextEvent(priv->display, &ev2);
 222                                                 --pending;
 223                                                 continue;
 224                                         }
 225                                 }
 226                         }
 227
 228                         j->second->event(event);
 229                 }
 230         }
 231
 232         return true;
 233 }
 234
 235 void Display::check_error()
 236 {
 237         if(error_flag)
 238         {
 239                 error_flag = false;
 240                 throw runtime_error(error_msg);
 241         }
 242 }
 243
 244 } // namespace Msp
 245 } // namespace Graphics