text: /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_X11
  
  #include "SDL_hints.h"
  #include "SDL_x11video.h"
  #include "SDL_timer.h"
  #include "edid.h"
  
  /* #define X11MODES_DEBUG */
  
  /* I'm becoming more and more convinced that the application should never
   * use XRandR, and it's the window manager's responsibility to track and
   * manage display modes for fullscreen windows.  Right now XRandR is completely
   * broken with respect to window manager behavior on every window manager that
   * I can find.  For example, on Unity 3D if you show a fullscreen window while
   * the resolution is changing (within ~250 ms) your window will retain the
   * fullscreen state hint but be decorated and windowed.
   *
   * However, many people swear by it, so let them swear at it. :)
  */
  /* #define XRANDR_DISABLED_BY_DEFAULT */
  
  
  static int
  get_visualinfo(Display * display, int screen, XVisualInfo * vinfo)
  {
      const char *visual_id = SDL_getenv("SDL_VIDEO_X11_VISUALID");
      int depth;
  
      /* Look for an exact visual, if requested */
      if (visual_id) {
          XVisualInfo *vi, template;
          int nvis;
  
          SDL_zero(template);
          template.visualid = SDL_strtol(visual_id, NULL, 0);
          vi = X11_XGetVisualInfo(display, VisualIDMask, &template, &nvis);
          if (vi) {
              *vinfo = *vi;
              X11_XFree(vi);
              return 0;
          }
      }
  
      depth = DefaultDepth(display, screen);
      if ((X11_UseDirectColorVisuals() &&
           X11_XMatchVisualInfo(display, screen, depth, DirectColor, vinfo)) ||
          X11_XMatchVisualInfo(display, screen, depth, TrueColor, vinfo) ||
          X11_XMatchVisualInfo(display, screen, depth, PseudoColor, vinfo) ||
          X11_XMatchVisualInfo(display, screen, depth, StaticColor, vinfo)) {
          return 0;
      }
      return -1;
  }
  
  int
  X11_GetVisualInfoFromVisual(Display * display, Visual * visual, XVisualInfo * vinfo)
  {
      XVisualInfo *vi;
      int nvis;
  
      vinfo->visualid = X11_XVisualIDFromVisual(visual);
      vi = X11_XGetVisualInfo(display, VisualIDMask, vinfo, &nvis);
      if (vi) {
          *vinfo = *vi;
          X11_XFree(vi);
          return 0;
      }
      return -1;
  }
  
  Uint32
  X11_GetPixelFormatFromVisualInfo(Display * display, XVisualInfo * vinfo)
  {
      if (vinfo->class == DirectColor || vinfo->class == TrueColor) {
          int bpp;
          Uint32 Rmask, Gmask, Bmask, Amask;
  
          Rmask = vinfo->visual->red_mask;
          Gmask = vinfo->visual->green_mask;
          Bmask = vinfo->visual->blue_mask;
          if (vinfo->depth == 32) {
              Amask = (0xFFFFFFFF & ~(Rmask | Gmask | Bmask));
          } else {
              Amask = 0;
          }
  
          bpp = vinfo->depth;
          if (bpp == 24) {
              int i, n;
              XPixmapFormatValues *p = X11_XListPixmapFormats(display, &n);
              if (p) {
                  for (i = 0; i < n; ++i) {
                      if (p[i].depth == 24) {
                          bpp = p[i].bits_per_pixel;
                          break;
                      }
                  }
                  X11_XFree(p);
              }
          }
  
          return SDL_MasksToPixelFormatEnum(bpp, Rmask, Gmask, Bmask, Amask);
      }
  
      if (vinfo->class == PseudoColor || vinfo->class == StaticColor) {
          switch (vinfo->depth) {
          case 8:
              return SDL_PIXELTYPE_INDEX8;
          case 4:
              if (BitmapBitOrder(display) == LSBFirst) {
                  return SDL_PIXELFORMAT_INDEX4LSB;
              } else {
                  return SDL_PIXELFORMAT_INDEX4MSB;
              }
              break;
          case 1:
              if (BitmapBitOrder(display) == LSBFirst) {
                  return SDL_PIXELFORMAT_INDEX1LSB;
              } else {
                  return SDL_PIXELFORMAT_INDEX1MSB;
              }
              break;
          }
      }
  
      return SDL_PIXELFORMAT_UNKNOWN;
  }
  
  /* Global for the error handler */
  int vm_event, vm_error = -1;
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
  static SDL_bool
  CheckXinerama(Display * display, int *major, int *minor)
  {
      int event_base = 0;
      int error_base = 0;
      const char *env;
  
      /* Default the extension not available */
      *major = *minor = 0;
  
      /* Allow environment override */
      env = SDL_GetHint(SDL_HINT_VIDEO_X11_XINERAMA);
      if (env && !SDL_atoi(env)) {
  #ifdef X11MODES_DEBUG
          printf("Xinerama disabled due to hint\n");
  #endif
          return SDL_FALSE;
      }
  
      if (!SDL_X11_HAVE_XINERAMA) {
  #ifdef X11MODES_DEBUG
          printf("Xinerama support not available\n");
  #endif
          return SDL_FALSE;
      }
  
      /* Query the extension version */
      if (!X11_XineramaQueryExtension(display, &event_base, &error_base) ||
          !X11_XineramaQueryVersion(display, major, minor) ||
          !X11_XineramaIsActive(display)) {
  #ifdef X11MODES_DEBUG
          printf("Xinerama not active on the display\n");
  #endif
          return SDL_FALSE;
      }
  #ifdef X11MODES_DEBUG
      printf("Xinerama available at version %d.%d!\n", *major, *minor);
  #endif
      return SDL_TRUE;
  }
  
  /* !!! FIXME: remove this later. */
  /* we have a weird bug where XineramaQueryScreens() throws an X error, so this
     is here to help track it down (and not crash, too!). */
  static SDL_bool xinerama_triggered_error = SDL_FALSE;
  static int
  X11_XineramaFailed(Display * d, XErrorEvent * e)
  {
      xinerama_triggered_error = SDL_TRUE;
      fprintf(stderr, "XINERAMA X ERROR: type=%d serial=%lu err=%u req=%u minor=%u\n",
              e->type, e->serial, (unsigned int) e->error_code,
              (unsigned int) e->request_code, (unsigned int) e->minor_code);
      fflush(stderr);
      return 0;
  }
  #endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
  
  #if SDL_VIDEO_DRIVER_X11_XRANDR
  static SDL_bool
  CheckXRandR(Display * display, int *major, int *minor)
  {
      const char *env;
  
      /* Default the extension not available */
      *major = *minor = 0;
  
      /* Allow environment override */
      env = SDL_GetHint(SDL_HINT_VIDEO_X11_XRANDR);
  #ifdef XRANDR_DISABLED_BY_DEFAULT
      if (!env || !SDL_atoi(env)) {
  #ifdef X11MODES_DEBUG
          printf("XRandR disabled by default due to window manager issues\n");
  #endif
          return SDL_FALSE;
      }
  #else
      if (env && !SDL_atoi(env)) {
  #ifdef X11MODES_DEBUG
          printf("XRandR disabled due to hint\n");
  #endif
          return SDL_FALSE;
      }
  #endif /* XRANDR_ENABLED_BY_DEFAULT */
  
      if (!SDL_X11_HAVE_XRANDR) {
  #ifdef X11MODES_DEBUG
          printf("XRandR support not available\n");
  #endif
          return SDL_FALSE;
      }
  
      /* Query the extension version */
      *major = 1; *minor = 3;  /* we want 1.3 */
      if (!X11_XRRQueryVersion(display, major, minor)) {
  #ifdef X11MODES_DEBUG
          printf("XRandR not active on the display\n");
  #endif
          *major = *minor = 0;
          return SDL_FALSE;
      }
  #ifdef X11MODES_DEBUG
      printf("XRandR available at version %d.%d!\n", *major, *minor);
  #endif
      return SDL_TRUE;
  }
  
  #define XRANDR_ROTATION_LEFT    (1 << 1)
  #define XRANDR_ROTATION_RIGHT   (1 << 3)
  
  static int
  CalculateXRandRRefreshRate(const XRRModeInfo *info)
  {
      return (info->hTotal
              && info->vTotal) ? (info->dotClock / (info->hTotal * info->vTotal)) : 0;
  }
  
  static SDL_bool
  SetXRandRModeInfo(Display *display, XRRScreenResources *res, RRCrtc crtc,
                    RRMode modeID, SDL_DisplayMode *mode)
  {
      int i;
      for (i = 0; i < res->nmode; ++i) {
          const XRRModeInfo *info = &res->modes[i];
          if (info->id == modeID) {
              XRRCrtcInfo *crtcinfo;
              Rotation rotation = 0;
  
              crtcinfo = X11_XRRGetCrtcInfo(display, res, crtc);
              if (crtcinfo) {
                  rotation = crtcinfo->rotation;
                  X11_XRRFreeCrtcInfo(crtcinfo);
              }
  
              if (rotation & (XRANDR_ROTATION_LEFT|XRANDR_ROTATION_RIGHT)) {
                  mode->w = info->height;
                  mode->h = info->width;
              } else {
                  mode->w = info->width;
                  mode->h = info->height;
              }
              mode->refresh_rate = CalculateXRandRRefreshRate(info);
              ((SDL_DisplayModeData*)mode->driverdata)->xrandr_mode = modeID;
  #ifdef X11MODES_DEBUG
              printf("XRandR mode %d: %dx%d@%dHz\n", (int) modeID, mode->w, mode->h, mode->refresh_rate);
  #endif
              return SDL_TRUE;
          }
      }
      return SDL_FALSE;
  }
  
  static void
  SetXRandRDisplayName(Display *dpy, Atom EDID, char *name, const size_t namelen, RROutput output, const unsigned long widthmm, const unsigned long heightmm)
  {
      /* See if we can get the EDID data for the real monitor name */
      int inches;
      int nprop;
      Atom *props = X11_XRRListOutputProperties(dpy, output, &nprop);
      int i;
  
      for (i = 0; i < nprop; ++i) {
          unsigned char *prop;
          int actual_format;
          unsigned long nitems, bytes_after;
          Atom actual_type;
  
          if (props[i] == EDID) {
              if (X11_XRRGetOutputProperty(dpy, output, props[i], 0, 100, False,
                                           False, AnyPropertyType, &actual_type,
                                           &actual_format, &nitems, &bytes_after,
                                           &prop) == Success) {
                  MonitorInfo *info = decode_edid(prop);
                  if (info) {
  #ifdef X11MODES_DEBUG
                      printf("Found EDID data for %s\n", name);
                      dump_monitor_info(info);
  #endif
                      SDL_strlcpy(name, info->dsc_product_name, namelen);
                      free(info);
                  }
                  X11_XFree(prop);
              }
              break;
          }
      }
  
      if (props) {
          X11_XFree(props);
      }
  
      inches = (int)((SDL_sqrt(widthmm * widthmm + heightmm * heightmm) / 25.4f) + 0.5f);
      if (*name && inches) {
          const size_t len = SDL_strlen(name);
          SDL_snprintf(&name[len], namelen-len, " %d\"", inches);
      }
  
  #ifdef X11MODES_DEBUG
      printf("Display name: %s\n", name);
  #endif
  }
  
  
  int
  X11_InitModes_XRandR(_THIS)
  {
      SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
      Display *dpy = data->display;
      const int screencount = ScreenCount(dpy);
      const int default_screen = DefaultScreen(dpy);
      RROutput primary = X11_XRRGetOutputPrimary(dpy, RootWindow(dpy, default_screen));
      Atom EDID = X11_XInternAtom(dpy, "EDID", False);
      XRRScreenResources *res = NULL;
      Uint32 pixelformat;
      XVisualInfo vinfo;
      XPixmapFormatValues *pixmapformats;
      int looking_for_primary;
      int scanline_pad;
      int output;
      int screen, i, n;
  
      for (looking_for_primary = 1; looking_for_primary >= 0; looking_for_primary--) {
          for (screen = 0; screen < screencount; screen++) {
  
              /* we want the primary output first, and then skipped later. */
              if (looking_for_primary && (screen != default_screen)) {
                  continue;
              }
  
              if (get_visualinfo(dpy, screen, &vinfo) < 0) {
                  continue;  /* uh, skip this screen? */
              }
  
              pixelformat = X11_GetPixelFormatFromVisualInfo(dpy, &vinfo);
              if (SDL_ISPIXELFORMAT_INDEXED(pixelformat)) {
                  continue;  /* Palettized video modes are no longer supported */
              }
  
              scanline_pad = SDL_BYTESPERPIXEL(pixelformat) * 8;
              pixmapformats = X11_XListPixmapFormats(dpy, &n);
              if (pixmapformats) {
                  for (i = 0; i < n; ++i) {
                      if (pixmapformats[i].depth == vinfo.depth) {
                          scanline_pad = pixmapformats[i].scanline_pad;
                          break;
                      }
                  }
                  X11_XFree(pixmapformats);
              }
  
              res = X11_XRRGetScreenResources(dpy, RootWindow(dpy, screen));
              if (!res) {
                  continue;
              }
  
              for (output = 0; output < res->noutput; output++) {
                  XRROutputInfo *output_info;
                  int display_x, display_y;
                  unsigned long display_mm_width, display_mm_height;
                  SDL_DisplayData *displaydata;
                  char display_name[128];
                  SDL_DisplayMode mode;
                  SDL_DisplayModeData *modedata;
                  SDL_VideoDisplay display;
                  RRMode modeID;
                  RRCrtc output_crtc;
                  XRRCrtcInfo *crtc;
  
                  /* The primary output _should_ always be sorted first, but just in case... */
                  if ((looking_for_primary && (res->outputs[output] != primary)) ||
                      (!looking_for_primary && (screen == default_screen) && (res->outputs[output] == primary))) {
                      continue;
                  }
  
                  output_info = X11_XRRGetOutputInfo(dpy, res, res->outputs[output]);
                  if (!output_info || !output_info->crtc || output_info->connection == RR_Disconnected) {
                      X11_XRRFreeOutputInfo(output_info);
                      continue;
                  }
  
                  SDL_strlcpy(display_name, output_info->name, sizeof(display_name));
                  display_mm_width = output_info->mm_width;
                  display_mm_height = output_info->mm_height;
                  output_crtc = output_info->crtc;
                  X11_XRRFreeOutputInfo(output_info);
  
                  crtc = X11_XRRGetCrtcInfo(dpy, res, output_crtc);
                  if (!crtc) {
                      continue;
                  }
  
                  SDL_zero(mode);
                  modeID = crtc->mode;
                  mode.w = crtc->width;
                  mode.h = crtc->height;
                  mode.format = pixelformat;
  
                  display_x = crtc->x;
                  display_y = crtc->y;
  
                  X11_XRRFreeCrtcInfo(crtc);
  
                  displaydata = (SDL_DisplayData *) SDL_calloc(1, sizeof(*displaydata));
                  if (!displaydata) {
                      return SDL_OutOfMemory();
                  }
  
                  modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
                  if (!modedata) {
                      SDL_free(displaydata);
                      return SDL_OutOfMemory();
                  }
                  modedata->xrandr_mode = modeID;
                  mode.driverdata = modedata;
  
                  displaydata->screen = screen;
                  displaydata->visual = vinfo.visual;
                  displaydata->depth = vinfo.depth;
                  displaydata->hdpi = ((float) mode.w) * 25.4f / display_mm_width;
                  displaydata->vdpi = ((float) mode.h) * 25.4f / display_mm_height;
                  displaydata->ddpi = SDL_ComputeDiagonalDPI(mode.w, mode.h, ((float) display_mm_width) / 25.4f,((float) display_mm_height) / 25.4f);
                  displaydata->scanline_pad = scanline_pad;
                  displaydata->x = display_x;
                  displaydata->y = display_y;
                  displaydata->use_xrandr = 1;
                  displaydata->xrandr_output = res->outputs[output];
  
                  SetXRandRModeInfo(dpy, res, output_crtc, modeID, &mode);
                  SetXRandRDisplayName(dpy, EDID, display_name, sizeof (display_name), res->outputs[output], display_mm_width, display_mm_height);
  
                  SDL_zero(display);
                  if (*display_name) {
                      display.name = display_name;
                  }
                  display.desktop_mode = mode;
                  display.current_mode = mode;
                  display.driverdata = displaydata;
                  SDL_AddVideoDisplay(&display);
              }
  
              X11_XRRFreeScreenResources(res);
          }
      }
  
      if (_this->num_displays == 0) {
          return SDL_SetError("No available displays");
      }
  
      return 0;
  }
  #endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
  
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
  static SDL_bool
  CheckVidMode(Display * display, int *major, int *minor)
  {
      const char *env;
  
      /* Default the extension not available */
      *major = *minor = 0;
  
      /* Allow environment override */
      env = SDL_GetHint(SDL_HINT_VIDEO_X11_XVIDMODE);
      if (env && !SDL_atoi(env)) {
  #ifdef X11MODES_DEBUG
          printf("XVidMode disabled due to hint\n");
  #endif
          return SDL_FALSE;
      }
  
      if (!SDL_X11_HAVE_XVIDMODE) {
  #ifdef X11MODES_DEBUG
          printf("XVidMode support not available\n");
  #endif
          return SDL_FALSE;
      }
  
      /* Query the extension version */
      vm_error = -1;
      if (!X11_XF86VidModeQueryExtension(display, &vm_event, &vm_error)
          || !X11_XF86VidModeQueryVersion(display, major, minor)) {
  #ifdef X11MODES_DEBUG
          printf("XVidMode not active on the display\n");
  #endif
          return SDL_FALSE;
      }
  #ifdef X11MODES_DEBUG
      printf("XVidMode available at version %d.%d!\n", *major, *minor);
  #endif
      return SDL_TRUE;
  }
  
  static
  Bool XF86VidModeGetModeInfo(Display * dpy, int scr,
                                         XF86VidModeModeInfo* info)
  {
      Bool retval;
      int dotclock;
      XF86VidModeModeLine l;
      SDL_zerop(info);
      SDL_zero(l);
      retval = X11_XF86VidModeGetModeLine(dpy, scr, &dotclock, &l);
      info->dotclock = dotclock;
      info->hdisplay = l.hdisplay;
      info->hsyncstart = l.hsyncstart;
      info->hsyncend = l.hsyncend;
      info->htotal = l.htotal;
      info->hskew = l.hskew;
      info->vdisplay = l.vdisplay;
      info->vsyncstart = l.vsyncstart;
      info->vsyncend = l.vsyncend;
      info->vtotal = l.vtotal;
      info->flags = l.flags;
      info->privsize = l.privsize;
      info->private = l.private;
      return retval;
  }
  
  static int
  CalculateXVidModeRefreshRate(const XF86VidModeModeInfo * info)
  {
      return (info->htotal
              && info->vtotal) ? (1000 * info->dotclock / (info->htotal *
                                                           info->vtotal)) : 0;
  }
  
  SDL_bool
  SetXVidModeModeInfo(const XF86VidModeModeInfo *info, SDL_DisplayMode *mode)
  {
      mode->w = info->hdisplay;
      mode->h = info->vdisplay;
      mode->refresh_rate = CalculateXVidModeRefreshRate(info);
      ((SDL_DisplayModeData*)mode->driverdata)->vm_mode = *info;
      return SDL_TRUE;
  }
  #endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
  
  int
  X11_InitModes(_THIS)
  {
      SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
      int snum, screen, screencount;
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
      int xinerama_major, xinerama_minor;
      int use_xinerama = 0;
      XineramaScreenInfo *xinerama = NULL;
  #endif
  #if SDL_VIDEO_DRIVER_X11_XRANDR
      int xrandr_major, xrandr_minor;
  #endif
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
      int vm_major, vm_minor;
      int use_vidmode = 0;
  #endif
  
  /* XRandR is the One True Modern Way to do this on X11. If it's enabled and
     available, don't even look at other ways of doing things. */
  #if SDL_VIDEO_DRIVER_X11_XRANDR
      /* require at least XRandR v1.3 */
      if (CheckXRandR(data->display, &xrandr_major, &xrandr_minor) &&
          (xrandr_major >= 2 || (xrandr_major == 1 && xrandr_minor >= 3))) {
          return X11_InitModes_XRandR(_this);
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
  
  /* !!! FIXME: eventually remove support for Xinerama and XVidMode (everything below here). */
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
      /* Query Xinerama extention
       * NOTE: This works with Nvidia Twinview correctly, but you need version 302.17 (released on June 2012)
       *       or newer of the Nvidia binary drivers
       */
      if (CheckXinerama(data->display, &xinerama_major, &xinerama_minor)) {
          int (*handler) (Display *, XErrorEvent *);
          X11_XSync(data->display, False);
          handler = X11_XSetErrorHandler(X11_XineramaFailed);
          xinerama = X11_XineramaQueryScreens(data->display, &screencount);
          X11_XSync(data->display, False);
          X11_XSetErrorHandler(handler);
          if (xinerama_triggered_error) {
              xinerama = 0;
          }
          if (xinerama) {
              use_xinerama = xinerama_major * 100 + xinerama_minor;
          }
      }
      if (!xinerama) {
          screencount = ScreenCount(data->display);
      }
  #else
      screencount = ScreenCount(data->display);
  #endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
  
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
      if (CheckVidMode(data->display, &vm_major, &vm_minor)) {
          use_vidmode = vm_major * 100 + vm_minor;
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
  
      for (snum = 0; snum < screencount; ++snum) {
          XVisualInfo vinfo;
          SDL_VideoDisplay display;
          SDL_DisplayData *displaydata;
          SDL_DisplayMode mode;
          SDL_DisplayModeData *modedata;
          XPixmapFormatValues *pixmapFormats;
          char display_name[128];
          int i, n;
  
          /* Re-order screens to always put default screen first */
          if (snum == 0) {
              screen = DefaultScreen(data->display);
          } else if (snum == DefaultScreen(data->display)) {
              screen = 0;
          } else {
              screen = snum;
          }
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
          if (xinerama) {
              if (get_visualinfo(data->display, 0, &vinfo) < 0) {
                  continue;
              }
          } else {
              if (get_visualinfo(data->display, screen, &vinfo) < 0) {
                  continue;
              }
          }
  #else
          if (get_visualinfo(data->display, screen, &vinfo) < 0) {
              continue;
          }
  #endif
  
          displaydata = (SDL_DisplayData *) SDL_calloc(1, sizeof(*displaydata));
          if (!displaydata) {
              continue;
          }
          display_name[0] = '\0';
  
          mode.format = X11_GetPixelFormatFromVisualInfo(data->display, &vinfo);
          if (SDL_ISPIXELFORMAT_INDEXED(mode.format)) {
              /* We don't support palettized modes now */
              SDL_free(displaydata);
              continue;
          }
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
          if (xinerama) {
              mode.w = xinerama[screen].width;
              mode.h = xinerama[screen].height;
          } else {
              mode.w = DisplayWidth(data->display, screen);
              mode.h = DisplayHeight(data->display, screen);
          }
  #else
          mode.w = DisplayWidth(data->display, screen);
          mode.h = DisplayHeight(data->display, screen);
  #endif
          mode.refresh_rate = 0;
  
          modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
          if (!modedata) {
              SDL_free(displaydata);
              continue;
          }
          mode.driverdata = modedata;
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
          /* Most of SDL's calls to X11 are unwaware of Xinerama, and to X11 standard calls, when Xinerama is active,
           * there's only one screen available. So we force the screen number to zero and
           * let Xinerama specific code handle specific functionality using displaydata->xinerama_info
           */
          if (use_xinerama) {
              displaydata->screen = 0;
              displaydata->use_xinerama = use_xinerama;
              displaydata->xinerama_info = xinerama[screen];
              displaydata->xinerama_screen = screen;
          }
          else displaydata->screen = screen;
  #else
          displaydata->screen = screen;
  #endif
          displaydata->visual = vinfo.visual;
          displaydata->depth = vinfo.depth;
  
          // We use the displaydata screen index here so that this works
          // for both the Xinerama case, where we get the overall DPI,
          // and the regular X11 screen info case.
          displaydata->hdpi = (float)DisplayWidth(data->display, displaydata->screen) * 25.4f /
              DisplayWidthMM(data->display, displaydata->screen);
          displaydata->vdpi = (float)DisplayHeight(data->display, displaydata->screen) * 25.4f /
              DisplayHeightMM(data->display, displaydata->screen);
          displaydata->ddpi = SDL_ComputeDiagonalDPI(DisplayWidth(data->display, displaydata->screen),
                                                     DisplayHeight(data->display, displaydata->screen),
                                                     (float)DisplayWidthMM(data->display, displaydata->screen) / 25.4f,
                                                     (float)DisplayHeightMM(data->display, displaydata->screen) / 25.4f);
  
          displaydata->scanline_pad = SDL_BYTESPERPIXEL(mode.format) * 8;
          pixmapFormats = X11_XListPixmapFormats(data->display, &n);
          if (pixmapFormats) {
              for (i = 0; i < n; ++i) {
                  if (pixmapFormats[i].depth == displaydata->depth) {
                      displaydata->scanline_pad = pixmapFormats[i].scanline_pad;
                      break;
                  }
              }
              X11_XFree(pixmapFormats);
          }
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
          if (use_xinerama) {
              displaydata->x = xinerama[screen].x_org;
              displaydata->y = xinerama[screen].y_org;
          }
          else
  #endif
          {
              displaydata->x = 0;
              displaydata->y = 0;
          }
  
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
          if (!displaydata->use_xrandr &&
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
              /* XVidMode only works on the screen at the origin */
              (!displaydata->use_xinerama ||
               (displaydata->x == 0 && displaydata->y == 0)) &&
  #endif
              use_vidmode) {
              displaydata->use_vidmode = use_vidmode;
              if (displaydata->use_xinerama) {
                  displaydata->vidmode_screen = 0;
              } else {
                  displaydata->vidmode_screen = screen;
              }
              XF86VidModeGetModeInfo(data->display, displaydata->vidmode_screen, &modedata->vm_mode);
          }
  #endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
  
          SDL_zero(display);
          if (*display_name) {
              display.name = display_name;
          }
          display.desktop_mode = mode;
          display.current_mode = mode;
          display.driverdata = displaydata;
          SDL_AddVideoDisplay(&display);
      }
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
      if (xinerama) X11_XFree(xinerama);
  #endif
  
      if (_this->num_displays == 0) {
          return SDL_SetError("No available displays");
      }
      return 0;
  }
  
  void
  X11_GetDisplayModes(_THIS, SDL_VideoDisplay * sdl_display)
  {
      Display *display = ((SDL_VideoData *) _this->driverdata)->display;
      SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
      int nmodes;
      XF86VidModeModeInfo ** modes;
  #endif
      int screen_w;
      int screen_h;
      SDL_DisplayMode mode;
  
      /* Unfortunately X11 requires the window to be created with the correct
       * visual and depth ahead of time, but the SDL API allows you to create
       * a window before setting the fullscreen display mode.  This means that
       * we have to use the same format for all windows and all display modes.
       * (or support recreating the window with a new visual behind the scenes)
       */
      mode.format = sdl_display->current_mode.format;
      mode.driverdata = NULL;
  
      screen_w = DisplayWidth(display, data->screen);
      screen_h = DisplayHeight(display, data->screen);
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
      if (data->use_xinerama) {
          if (data->use_vidmode && !data->xinerama_info.x_org && !data->xinerama_info.y_org &&
             (screen_w > data->xinerama_info.width || screen_h > data->xinerama_info.height)) {
              SDL_DisplayModeData *modedata;
              /* Add the full (both screens combined) xinerama mode only on the display that starts at 0,0
               * if we're using vidmode.
               */
              mode.w = screen_w;
              mode.h = screen_h;
              mode.refresh_rate = 0;
              modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
              if (modedata) {
                  *modedata = *(SDL_DisplayModeData *)sdl_display->desktop_mode.driverdata;
              }
              mode.driverdata = modedata;
              if (!SDL_AddDisplayMode(sdl_display, &mode)) {
                  SDL_free(modedata);
              }
          }
          else if (!data->use_xrandr)
          {
              SDL_DisplayModeData *modedata;
              /* Add the current mode of each monitor otherwise if we can't get them from xrandr */
              mode.w = data->xinerama_info.width;
              mode.h = data->xinerama_info.height;
              mode.refresh_rate = 0;
              modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
              if (modedata) {
                  *modedata = *(SDL_DisplayModeData *)sdl_display->desktop_mode.driverdata;
              }
              mode.driverdata = modedata;
              if (!SDL_AddDisplayMode(sdl_display, &mode)) {
                  SDL_free(modedata);
              }
          }
  
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
  
  #if SDL_VIDEO_DRIVER_X11_XRANDR
      if (data->use_xrandr) {
          XRRScreenResources *res;
  
          res = X11_XRRGetScreenResources (display, RootWindow(display, data->screen));
          if (res) {
              SDL_DisplayModeData *modedata;
              XRROutputInfo *output_info;
              int i;
  
              output_info = X11_XRRGetOutputInfo(display, res, data->xrandr_output);
              if (output_info && output_info->connection != RR_Disconnected) {
                  for (i = 0; i < output_info->nmode; ++i) {
                      modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
                      if (!modedata) {
                          continue;
                      }
                      mode.driverdata = modedata;
  
                      if (!SetXRandRModeInfo(display, res, output_info->crtc, output_info->modes[i], &mode) ||
                          !SDL_AddDisplayMode(sdl_display, &mode)) {
                          SDL_free(modedata);
                      }
                  }
              }
              X11_XRRFreeOutputInfo(output_info);
              X11_XRRFreeScreenResources(res);
          }
          return;
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
  
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
      if (data->use_vidmode &&
          X11_XF86VidModeGetAllModeLines(display, data->vidmode_screen, &nmodes, &modes)) {
          int i;
          SDL_DisplayModeData *modedata;
  
  #ifdef X11MODES_DEBUG
          printf("VidMode modes: (unsorted)\n");
          for (i = 0; i < nmodes; ++i) {
              printf("Mode %d: %d x %d @ %d, flags: 0x%x\n", i,
                     modes[i]->hdisplay, modes[i]->vdisplay,
                     CalculateXVidModeRefreshRate(modes[i]), modes[i]->flags);
          }
  #endif
          for (i = 0; i < nmodes; ++i) {
              modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
              if (!modedata) {
                  continue;
              }
              mode.driverdata = modedata;
  
              if (!SetXVidModeModeInfo(modes[i], &mode) || !SDL_AddDisplayMode(sdl_display, &mode)) {
                  SDL_free(modedata);
              }
          }
          X11_XFree(modes);
          return;
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
  
      if (!data->use_xrandr && !data->use_vidmode) {
          SDL_DisplayModeData *modedata;
          /* Add the desktop mode */
          mode = sdl_display->desktop_mode;
          modedata = (SDL_DisplayModeData *) SDL_calloc(1, sizeof(SDL_DisplayModeData));
          if (modedata) {
              *modedata = *(SDL_DisplayModeData *)sdl_display->desktop_mode.driverdata;
          }
          mode.driverdata = modedata;
          if (!SDL_AddDisplayMode(sdl_display, &mode)) {
              SDL_free(modedata);
          }
      }
  }
  
  int
  X11_SetDisplayMode(_THIS, SDL_VideoDisplay * sdl_display, SDL_DisplayMode * mode)
  {
      SDL_VideoData *viddata = (SDL_VideoData *) _this->driverdata;
      Display *display = viddata->display;
      SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
      SDL_DisplayModeData *modedata = (SDL_DisplayModeData *)mode->driverdata;
  
      viddata->last_mode_change_deadline = SDL_GetTicks() + (PENDING_FOCUS_TIME * 2);
  
  #if SDL_VIDEO_DRIVER_X11_XRANDR
      if (data->use_xrandr) {
          XRRScreenResources *res;
          XRROutputInfo *output_info;
          XRRCrtcInfo *crtc;
          Status status;
  
          res = X11_XRRGetScreenResources (display, RootWindow(display, data->screen));
          if (!res) {
              return SDL_SetError("Couldn't get XRandR screen resources");
          }
  
          output_info = X11_XRRGetOutputInfo(display, res, data->xrandr_output);
          if (!output_info || output_info->connection == RR_Disconnected) {
              X11_XRRFreeScreenResources(res);
              return SDL_SetError("Couldn't get XRandR output info");
          }
  
          crtc = X11_XRRGetCrtcInfo(display, res, output_info->crtc);
          if (!crtc) {
              X11_XRRFreeOutputInfo(output_info);
              X11_XRRFreeScreenResources(res);
              return SDL_SetError("Couldn't get XRandR crtc info");
          }
  
          status = X11_XRRSetCrtcConfig (display, res, output_info->crtc, CurrentTime,
            crtc->x, crtc->y, modedata->xrandr_mode, crtc->rotation,
            &data->xrandr_output, 1);
  
          X11_XRRFreeCrtcInfo(crtc);
          X11_XRRFreeOutputInfo(output_info);
          X11_XRRFreeScreenResources(res);
  
          if (status != Success) {
              return SDL_SetError("X11_XRRSetCrtcConfig failed");
          }
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XRANDR */
  
  #if SDL_VIDEO_DRIVER_X11_XVIDMODE
      if (data->use_vidmode) {
          X11_XF86VidModeSwitchToMode(display, data->vidmode_screen, &modedata->vm_mode);
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XVIDMODE */
  
      return 0;
  }
  
  void
  X11_QuitModes(_THIS)
  {
  }
  
  int
  X11_GetDisplayBounds(_THIS, SDL_VideoDisplay * sdl_display, SDL_Rect * rect)
  {
      SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
  
      rect->x = data->x;
      rect->y = data->y;
      rect->w = sdl_display->current_mode.w;
      rect->h = sdl_display->current_mode.h;
  
  #if SDL_VIDEO_DRIVER_X11_XINERAMA
      /* Get the real current bounds of the display */
      if (data->use_xinerama) {
          Display *display = ((SDL_VideoData *) _this->driverdata)->display;
          int screencount;
          XineramaScreenInfo *xinerama = X11_XineramaQueryScreens(display, &screencount);
          if (xinerama) {
              rect->x = xinerama[data->xinerama_screen].x_org;
              rect->y = xinerama[data->xinerama_screen].y_org;
              X11_XFree(xinerama);
          }
      }
  #endif /* SDL_VIDEO_DRIVER_X11_XINERAMA */
      return 0;
  }
  
  int
  X11_GetDisplayDPI(_THIS, SDL_VideoDisplay * sdl_display, float * ddpi, float * hdpi, float * vdpi)
  {
      SDL_DisplayData *data = (SDL_DisplayData *) sdl_display->driverdata;
  
      if (ddpi) {
          *ddpi = data->ddpi;
      }
      if (hdpi) {
          *hdpi = data->hdpi;
      }
      if (vdpi) {
          *vdpi = data->vdpi;
      }
  
      return data->ddpi != 0.0f ? 0 : -1;
  }
  
  #endif /* SDL_VIDEO_DRIVER_X11 */
  
  /* vi: set ts=4 sw=4 expandtab: */
  