xbmc-xrandr.c

/*
 * Copyright © 2001 Keith Packard, member of The XFree86 Project, Inc.
 * Copyright © 2002 Hewlett Packard Company, Inc.
 * Copyright © 2006 Intel Corporation
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 *
 * Thanks to Jim Gettys who wrote most of the client side code,
 * and part of the server code for randr.
 */

#include <math.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <X11/Xproto.h>
#include <X11/extensions/Xrandr.h>
#include <X11/extensions/Xrender.h> /* we share subpixel information */
#include <strings.h>

#ifndef _X_NORETURN
#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)
#define _X_NORETURN __attribute((noreturn))
#else
#define _X_NORETURN
#endif
#endif

static char* program_name;
static Display* dpy;
static Window root;
static int screen = -1;
static Bool verbose = False;
static Bool automatic = False;
static Bool properties = False;
static Bool grab_server = True;
static Bool no_primary = False;

static char* direction[5] = {"normal", "left", "inverted", "right", "\n"};

static char* reflections[5] = {"normal", "x", "y", "xy", "\n"};

/* subpixel order */
static char* order[6] = {"unknown",      "horizontal rgb", "horizontal bgr",
                         "vertical rgb", "vertical bgr",   "no subpixels"};

static const struct
{
  char* string;
  unsigned long flag;
} mode_flags[] = {{"+HSync", RR_HSyncPositive}, {"-HSync", RR_HSyncNegative},
                  {"+VSync", RR_VSyncPositive}, {"-VSync", RR_VSyncNegative},
                  {"Interlace", RR_Interlace},  {"DoubleScan", RR_DoubleScan},
                  {"CSync", RR_CSync},          {"+CSync", RR_CSyncPositive},
                  {"-CSync", RR_CSyncNegative}, {NULL, 0}};

static void _X_NORETURN usage(void)
{
  fprintf(stderr, "usage: %s [options]\n", program_name);
  fprintf(stderr, "  where options are:\n");
  fprintf(stderr, "  -display <display> or -d <display>\n");
  fprintf(stderr, "  -help\n");
  fprintf(stderr, "  -o <normal,inverted,left,right,0,1,2,3>\n");
  fprintf(stderr, "            or --orientation <normal,inverted,left,right,0,1,2,3>\n");
  fprintf(stderr, "  -q        or --query\n");
  fprintf(stderr, "  -s <size>/<width>x<height> or --size <size>/<width>x<height>\n");
  fprintf(stderr, "  -r <rate> or --rate <rate> or --refresh <rate>\n");
  fprintf(stderr, "  -v        or --version\n");
  fprintf(stderr, "  -x        (reflect in x)\n");
  fprintf(stderr, "  -y        (reflect in y)\n");
  fprintf(stderr, "  --screen <screen>\n");
  fprintf(stderr, "  --verbose\n");
  fprintf(stderr, "  --current\n");
  fprintf(stderr, "  --dryrun\n");
  fprintf(stderr, "  --nograb\n");
  fprintf(stderr, "  --prop or --properties\n");
  fprintf(stderr, "  --fb <width>x<height>\n");
  fprintf(stderr, "  --fbmm <width>x<height>\n");
  fprintf(stderr, "  --dpi <dpi>/<output>\n");
  fprintf(stderr, "  --output <output>\n");
  fprintf(stderr, "      --auto\n");
  fprintf(stderr, "      --mode <mode>\n");
  fprintf(stderr, "      --preferred\n");
  fprintf(stderr, "      --pos <x>x<y>\n");
  fprintf(stderr, "      --rate <rate> or --refresh <rate>\n");
  fprintf(stderr, "      --reflect normal,x,y,xy\n");
  fprintf(stderr, "      --rotate normal,inverted,left,right\n");
  fprintf(stderr, "      --left-of <output>\n");
  fprintf(stderr, "      --right-of <output>\n");
  fprintf(stderr, "      --above <output>\n");
  fprintf(stderr, "      --below <output>\n");
  fprintf(stderr, "      --same-as <output>\n");
  fprintf(stderr, "      --set <property> <value>\n");
  fprintf(stderr, "      --scale <x>x<y>\n");
  fprintf(stderr, "      --scale-from <w>x<h>\n");
  fprintf(stderr, "      --transform <a>,<b>,<c>,<d>,<e>,<f>,<g>,<h>,<i>\n");
  fprintf(stderr, "      --off\n");
  fprintf(stderr, "      --crtc <crtc>\n");
  fprintf(stderr,
          "      --panning <w>x<h>[+<x>+<y>[/<track:w>x<h>+<x>+<y>[/<border:l>/<t>/<r>/<b>]]]\n");
  fprintf(stderr, "      --gamma <r>:<g>:<b>\n");
  fprintf(stderr, "      --primary\n");
  fprintf(stderr, "  --noprimary\n");
  fprintf(stderr, "  --newmode <name> <clock MHz>\n");
  fprintf(stderr, "            <hdisp> <hsync-start> <hsync-end> <htotal>\n");
  fprintf(stderr, "            <vdisp> <vsync-start> <vsync-end> <vtotal>\n");
  fprintf(stderr, "            [flags...]\n");
  fprintf(stderr, "            Valid flags: +HSync -HSync +VSync -VSync\n");
  fprintf(stderr, "                         +CSync -CSync CSync Interlace DoubleScan\n");
  fprintf(stderr, "  --rmmode <name>\n");
  fprintf(stderr, "  --addmode <output> <name>\n");
  fprintf(stderr, "  --delmode <output> <name>\n");

  exit(1);
  /*NOTREACHED*/
}

static void _X_NORETURN fatal(const char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  fprintf(stderr, "%s: ", program_name);
  vfprintf(stderr, format, ap);
  va_end(ap);
  exit(1);
  /*NOTREACHED*/
}

static void warning(const char* format, ...)
{
  va_list ap;

  va_start(ap, format);
  fprintf(stderr, "%s: ", program_name);
  vfprintf(stderr, format, ap);
  va_end(ap);
}

static char* rotation_name(Rotation rotation)
{
  int i;

  if ((rotation & 0xf) == 0)
    return "normal";
  for (i = 0; i < 4; i++)
    if (rotation & (1 << i))
      return direction[i];
  return "invalid rotation";
}

static char* reflection_name(Rotation rotation)
{
  rotation &= (RR_Reflect_X | RR_Reflect_Y);
  switch (rotation)
  {
    case 0:
      return "none";
    case RR_Reflect_X:
      return "X axis";
    case RR_Reflect_Y:
      return "Y axis";
    case RR_Reflect_X | RR_Reflect_Y:
      return "X and Y axis";
  }
  return "invalid reflection";
}

typedef enum _relation
{
  relation_left_of,
  relation_right_of,
  relation_above,
  relation_below,
  relation_same_as,
} relation_t;

typedef struct
{
  int x, y, width, height;
} rectangle_t;

typedef struct
{
  int x1, y1, x2, y2;
} box_t;

typedef struct
{
  int x, y;
} point_t;

typedef enum _changes
{
  changes_none = 0,
  changes_crtc = (1 << 0),
  changes_mode = (1 << 1),
  changes_relation = (1 << 2),
  changes_position = (1 << 3),
  changes_rotation = (1 << 4),
  changes_reflection = (1 << 5),
  changes_automatic = (1 << 6),
  changes_refresh = (1 << 7),
  changes_property = (1 << 8),
  changes_transform = (1 << 9),
  changes_panning = (1 << 10),
  changes_gamma = (1 << 11),
  changes_primary = (1 << 12),
} changes_t;

typedef enum _name_kind
{
  name_none = 0,
  name_string = (1 << 0),
  name_xid = (1 << 1),
  name_index = (1 << 2),
  name_preferred = (1 << 3),
} name_kind_t;

typedef struct
{
  name_kind_t kind;
  char* string;
  XID xid;
  int index;
} name_t;

typedef struct _crtc crtc_t;
typedef struct _output output_t;
typedef struct _transform transform_t;
typedef struct _umode umode_t;
typedef struct _output_prop output_prop_t;

struct _transform
{
  XTransform transform;
  char* filter;
  int nparams;
  XFixed* params;
};

struct _crtc
{
  name_t crtc;
  Bool changing;
  XRRCrtcInfo* crtc_info;

  XRRModeInfo* mode_info;
  XRRPanning* panning_info;
  int x;
  int y;
  Rotation rotation;
  output_t** outputs;
  int noutput;
  transform_t current_transform, pending_transform;
};

struct _output_prop
{
  struct _output_prop* next;
  char* name;
  char* value;
};

struct _output
{
  struct _output* next;

  changes_t changes;

  output_prop_t* props;

  name_t output;
  XRROutputInfo* output_info;

  name_t crtc;
  crtc_t* crtc_info;
  crtc_t* current_crtc_info;

  name_t mode;
  double refresh;
  XRRModeInfo* mode_info;

  name_t addmode;

  relation_t relation;
  char* relative_to;

  int x, y;
  Rotation rotation;

  XRRPanning panning;

  Bool automatic;
  int scale_from_w, scale_from_h;
  transform_t transform;

  struct
  {
    float red;
    float green;
    float blue;
  } gamma;

  float brightness;

  Bool primary;

  Bool found;
};

typedef enum _umode_action
{
  umode_create,
  umode_destroy,
  umode_add,
  umode_delete
} umode_action_t;


struct _umode
{
  struct _umode* next;

  umode_action_t action;
  XRRModeInfo mode;
  name_t output;
  name_t name;
};

/*

static char *connection[3] = {
    "connected",
    "disconnected",
    "unknown connection"};

*/

static char* connection[3] = {"true", "false", "unknown"};

#define OUTPUT_NAME 1

#define CRTC_OFF 2
#define CRTC_UNSET 3
#define CRTC_INDEX 0x40000000

#define MODE_NAME 1
#define MODE_OFF 2
#define MODE_UNSET 3
#define MODE_PREF 4

#define POS_UNSET -1

static output_t* outputs = NULL;
static output_t** outputs_tail = &outputs;
static crtc_t* crtcs;
static umode_t* umodes;
static int num_crtcs;
static XRRScreenResources* res;
static int fb_width = 0, fb_height = 0;
static int fb_width_mm = 0, fb_height_mm = 0;
static double dpi = 0;
static char* dpi_output = NULL;
static Bool dryrun = False;
static int minWidth, maxWidth, minHeight, maxHeight;
static Bool has_1_2 = False;
static Bool has_1_3 = False;

static int mode_height(XRRModeInfo* mode_info, Rotation rotation)
{
  switch (rotation & 0xf)
  {
    case RR_Rotate_0:
    case RR_Rotate_180:
      return mode_info->height;
    case RR_Rotate_90:
    case RR_Rotate_270:
      return mode_info->width;
    default:
      return 0;
  }
}

static int mode_width(XRRModeInfo* mode_info, Rotation rotation)
{
  switch (rotation & 0xf)
  {
    case RR_Rotate_0:
    case RR_Rotate_180:
      return mode_info->width;
    case RR_Rotate_90:
    case RR_Rotate_270:
      return mode_info->height;
    default:
      return 0;
  }
}

static Bool transform_point(XTransform* transform, double* xp, double* yp)
{
  double vector[3];
  double result[3];
  int i, j;
  double v;

  vector[0] = *xp;
  vector[1] = *yp;
  vector[2] = 1;
  for (j = 0; j < 3; j++)
  {
    v = 0;
    for (i = 0; i < 3; i++)
      v += (XFixedToDouble(transform->matrix[j][i]) * vector[i]);
    result[j] = v;
  }
  if (!result[2])
    return False;
  for (j = 0; j < 2; j++)
  {
    vector[j] = result[j] / result[2];
    if (vector[j] > 32767 || vector[j] < -32767)
      return False;
  }
  *xp = vector[0];
  *yp = vector[1];
  return True;
}

static void path_bounds(XTransform* transform, point_t* points, int npoints, box_t* box)
{
  int i;
  box_t point;

  for (i = 0; i < npoints; i++)
  {
    double x, y;
    x = points[i].x;
    y = points[i].y;
    transform_point(transform, &x, &y);
    point.x1 = floor(x);
    point.y1 = floor(y);
    point.x2 = ceil(x);
    point.y2 = ceil(y);
    if (i == 0)
      *box = point;
    else
    {
      if (point.x1 < box->x1)
        box->x1 = point.x1;
      if (point.y1 < box->y1)
        box->y1 = point.y1;
      if (point.x2 > box->x2)
        box->x2 = point.x2;
      if (point.y2 > box->y2)
        box->y2 = point.y2;
    }
  }
}

static void mode_geometry(XRRModeInfo* mode_info,
                          Rotation rotation,
                          XTransform* transform,
                          box_t* bounds)
{
  point_t rect[4];
  int width = mode_width(mode_info, rotation);
  int height = mode_height(mode_info, rotation);

  rect[0].x = 0;
  rect[0].y = 0;
  rect[1].x = width;
  rect[1].y = 0;
  rect[2].x = width;
  rect[2].y = height;
  rect[3].x = 0;
  rect[3].y = height;
  path_bounds(transform, rect, 4, bounds);
}

/* v refresh frequency in Hz */
static double mode_refresh(XRRModeInfo* mode_info)
{
  double rate;

  if (mode_info->hTotal && mode_info->vTotal)
    rate = ((double)mode_info->dotClock / ((double)mode_info->hTotal * (double)mode_info->vTotal));
  else
    rate = 0;
  return rate;
}

/* h sync frequency in Hz */
static double mode_hsync(XRRModeInfo* mode_info)
{
  double rate;

  if (mode_info->hTotal)
    rate = (double)mode_info->dotClock / (double)mode_info->hTotal;
  else
    rate = 0;
  return rate;
}

static void init_name(name_t* name)
{
  name->kind = name_none;
}

static void set_name_string(name_t* name, char* string)
{
  name->kind |= name_string;
  name->string = string;
}

static void set_name_xid(name_t* name, XID xid)
{
  name->kind |= name_xid;
  name->xid = xid;
}

static void set_name_index(name_t* name, int index)
{
  name->kind |= name_index;
  name->index = index;
}

static void set_name_preferred(name_t* name)
{
  name->kind |= name_preferred;
}

static void set_name_all(name_t* name, name_t* old)
{
  if (old->kind & name_xid)
    name->xid = old->xid;
  if (old->kind & name_string)
    name->string = old->string;
  if (old->kind & name_index)
    name->index = old->index;
  name->kind |= old->kind;
}

static void set_name(name_t* name, char* string, name_kind_t valid)
{
  unsigned int xid; /* don't make it XID (which is unsigned long):
			 scanf() takes unsigned int */
  int index;

  if ((valid & name_xid) && sscanf(string, "0x%x", &xid) == 1)
    set_name_xid(name, xid);
  else if ((valid & name_index) && sscanf(string, "%d", &index) == 1)
    set_name_index(name, index);
  else if (valid & name_string)
    set_name_string(name, string);
  else
    usage();
}

static void init_transform(transform_t* transform)
{
  int x;
  memset(&transform->transform, '\0', sizeof(transform->transform));
  for (x = 0; x < 3; x++)
    transform->transform.matrix[x][x] = XDoubleToFixed(1.0);
  transform->filter = "";
  transform->nparams = 0;
  transform->params = NULL;
}

static void set_transform(
    transform_t* dest, XTransform* transform, char* filter, XFixed* params, int nparams)
{
  dest->transform = *transform;
  dest->filter = strdup(filter);
  dest->nparams = nparams;
  if (nparams)
  {
    dest->params = malloc(nparams * sizeof(XFixed));
    memcpy(dest->params, params, nparams * sizeof(XFixed));
  }
  else
    dest->params = NULL;
}

static void copy_transform(transform_t* dest, transform_t* src)
{
  set_transform(dest, &src->transform, src->filter, src->params, src->nparams);
}

static Bool equal_transform(transform_t* a, transform_t* b)
{
  if (memcmp(&a->transform, &b->transform, sizeof(XTransform)) != 0)
    return False;
  if (strcmp(a->filter, b->filter) != 0)
    return False;
  if (a->nparams != b->nparams)
    return False;
  if (memcmp(a->params, b->params, a->nparams * sizeof(XFixed)) != 0)
    return False;
  return True;
}

static output_t* add_output(void)
{
  output_t* output = calloc(1, sizeof(output_t));

  if (!output)
    fatal("out of memory\n");
  output->next = NULL;
  output->found = False;
  output->brightness = 1.0;
  *outputs_tail = output;
  outputs_tail = &output->next;
  return output;
}

static output_t* find_output(name_t* name)
{
  output_t* output;

  for (output = outputs; output; output = output->next)
  {
    name_kind_t common = name->kind & output->output.kind;

    if ((common & name_xid) && name->xid == output->output.xid)
      break;
    if ((common & name_string) && !strcmp(name->string, output->output.string))
      break;
    if ((common & name_index) && name->index == output->output.index)
      break;
  }
  return output;
}

static output_t* find_output_by_xid(RROutput output)
{
  name_t output_name;

  init_name(&output_name);
  set_name_xid(&output_name, output);
  return find_output(&output_name);
}

static output_t* find_output_by_name(char* name)
{
  name_t output_name;

  init_name(&output_name);
  set_name_string(&output_name, name);
  return find_output(&output_name);
}

static crtc_t* find_crtc(name_t* name)
{
  int c;
  crtc_t* crtc = NULL;

  for (c = 0; c < num_crtcs; c++)
  {
    name_kind_t common;

    crtc = &crtcs[c];
    common = name->kind & crtc->crtc.kind;

    if ((common & name_xid) && name->xid == crtc->crtc.xid)
      break;
    if ((common & name_string) && !strcmp(name->string, crtc->crtc.string))
      break;
    if ((common & name_index) && name->index == crtc->crtc.index)
      break;
    crtc = NULL;
  }
  return crtc;
}

static crtc_t* find_crtc_by_xid(RRCrtc crtc)
{
  name_t crtc_name;

  init_name(&crtc_name);
  set_name_xid(&crtc_name, crtc);
  return find_crtc(&crtc_name);
}

static XRRModeInfo* find_mode(name_t* name, double refresh)
{
  int m;
  XRRModeInfo* best = NULL;
  double bestDist = 0;

  for (m = 0; m < res->nmode; m++)
  {
    XRRModeInfo* mode = &res->modes[m];
    if ((name->kind & name_xid) && name->xid == mode->id)
    {
      best = mode;
      break;
    }
    if ((name->kind & name_string) && !strcmp(name->string, mode->name))
    {
      double dist;

      if (refresh)
        dist = fabs(mode_refresh(mode) - refresh);
      else
        dist = 0;
      if (!best || dist < bestDist)
      {
        bestDist = dist;
        best = mode;
      }
    }
  }
  return best;
}

static XRRModeInfo* find_mode_by_xid(RRMode mode)
{
  name_t mode_name;

  init_name(&mode_name);
  set_name_xid(&mode_name, mode);
  return find_mode(&mode_name, 0);
}

#if 0
static XRRModeInfo *
find_mode_by_name (char *name)
{
    name_t  mode_name;
    init_name (&mode_name);
    set_name_string (&mode_name, name);
    return find_mode (&mode_name, 0);
}
#endif

static XRRModeInfo* find_mode_for_output(output_t* output, name_t* name)
{
  XRROutputInfo* output_info = output->output_info;
  int m;
  XRRModeInfo* best = NULL;
  double bestDist = 0;

  for (m = 0; m < output_info->nmode; m++)
  {
    XRRModeInfo* mode;

    mode = find_mode_by_xid(output_info->modes[m]);
    if (!mode)
      continue;
    if ((name->kind & name_xid) && name->xid == mode->id)
    {
      best = mode;
      break;
    }
    if ((name->kind & name_string) && !strcmp(name->string, mode->name))
    {
      double dist;

      /* Stay away from doublescan modes unless refresh rate is specified. */
      if (!output->refresh && (mode->modeFlags & RR_DoubleScan))
        continue;

      if (output->refresh)
        dist = fabs(mode_refresh(mode) - output->refresh);
      else
        dist = 0;
      if (!best || dist < bestDist)
      {
        bestDist = dist;
        best = mode;
      }
    }
  }
  return best;
}

static XRRModeInfo* preferred_mode(output_t* output)
{
  XRROutputInfo* output_info = output->output_info;
  int m;
  XRRModeInfo* best;
  int bestDist;

  best = NULL;
  bestDist = 0;
  for (m = 0; m < output_info->nmode; m++)
  {
    XRRModeInfo* mode_info = find_mode_by_xid(output_info->modes[m]);
    int dist;

    if (m < output_info->npreferred)
      dist = 0;
    else if (output_info->mm_height)
      dist = (1000 * DisplayHeight(dpy, screen) / DisplayHeightMM(dpy, screen) -
              1000 * mode_info->height / output_info->mm_height);
    else
      dist = DisplayHeight(dpy, screen) - mode_info->height;

    if (dist < 0)
      dist = -dist;
    if (!best || dist < bestDist)
    {
      best = mode_info;
      bestDist = dist;
    }
  }
  return best;
}

static Bool output_can_use_crtc(output_t* output, crtc_t* crtc)
{
  XRROutputInfo* output_info = output->output_info;
  int c;

  for (c = 0; c < output_info->ncrtc; c++)
    if (output_info->crtcs[c] == crtc->crtc.xid)
      return True;
  return False;
}

static Bool output_can_use_mode(output_t* output, XRRModeInfo* mode)
{
  XRROutputInfo* output_info = output->output_info;
  int m;

  for (m = 0; m < output_info->nmode; m++)
    if (output_info->modes[m] == mode->id)
      return True;
  return False;
}

static Bool crtc_can_use_rotation(crtc_t* crtc, Rotation rotation)
{
  Rotation rotations = crtc->crtc_info->rotations;
  Rotation dir = rotation & (RR_Rotate_0 | RR_Rotate_90 | RR_Rotate_180 | RR_Rotate_270);
  Rotation reflect = rotation & (RR_Reflect_X | RR_Reflect_Y);
  if (((rotations & dir) != 0) && ((rotations & reflect) == reflect))
    return True;
  return False;
}

#if 0
static Bool
crtc_can_use_transform (crtc_t *crtc, XTransform *transform)
{
    int	major, minor;

    XRRQueryVersion (dpy, &major, &minor);
    if (major > 1 || (major == 1 && minor >= 3))
	return True;
    return False;
}

/*
 * Report only rotations that are supported by all crtcs
 */
static Rotation
output_rotations (output_t *output)
{
    Bool	    found = False;
    Rotation	    rotation = RR_Rotate_0;
    XRROutputInfo   *output_info = output->output_info;
    int		    c;

    for (c = 0; c < output_info->ncrtc; c++)
    {
	crtc_t	*crtc = find_crtc_by_xid (output_info->crtcs[c]);
	if (crtc)
	{
	    if (!found) {
		rotation = crtc->crtc_info->rotations;
		found = True;
	    } else
		rotation &= crtc->crtc_info->rotations;
	}
    }
    return rotation;
}
#endif

static Bool output_can_use_rotation(output_t* output, Rotation rotation)
{
  XRROutputInfo* output_info = output->output_info;
  int c;

  /* make sure all of the crtcs can use this rotation.
     * yes, this is not strictly necessary, but it is
     * simpler,and we expect most drivers to either
     * support rotation everywhere or nowhere
     */
  for (c = 0; c < output_info->ncrtc; c++)
  {
    crtc_t* crtc = find_crtc_by_xid(output_info->crtcs[c]);
    if (crtc && !crtc_can_use_rotation(crtc, rotation))
      return False;
  }
  return True;
}

static Bool output_is_primary(output_t* output)
{
  if (has_1_3)
    return XRRGetOutputPrimary(dpy, root) == output->output.xid;
  return False;
}

/* Returns the index of the last value in an array < 0xffff */
static int find_last_non_clamped(CARD16 array[], int size)
{
  int i;
  for (i = size - 1; i > 0; i--)
  {
    if (array[i] < 0xffff)
      return i;
  }
  return 0;
}

static void set_gamma_info(output_t* output)
{
  XRRCrtcGamma* gamma;
  double i1, v1, i2, v2;
  int size, middle, last_best, last_red, last_green, last_blue;
  CARD16* best_array;

  if (!output->crtc_info)
    return;

  size = XRRGetCrtcGammaSize(dpy, output->crtc_info->crtc.xid);
  if (!size)
  {
    warning("Failed to get size of gamma for output %s\n", output->output.string);
    return;
  }

  gamma = XRRGetCrtcGamma(dpy, output->crtc_info->crtc.xid);
  if (!gamma)
  {
    warning("Failed to get gamma for output %s\n", output->output.string);
    return;
  }

  /*
     * Here is a bit tricky because gamma is a whole curve for each
     * color.  So, typically, we need to represent 3 * 256 values as 3 + 1
     * values.  Therefore, we approximate the gamma curve (v) by supposing
     * it always follows the way we set it: a power function (i^g)
     * multiplied by a brightness (b).
     * v = i^g * b
     * so g = (ln(v) - ln(b))/ln(i)
     * and b can be found using two points (v1,i1) and (v2, i2):
     * b = e^((ln(v2)*ln(i1) - ln(v1)*ln(i2))/ln(i1/i2))
     * For the best resolution, we select i2 at the highest place not
     * clamped and i1 at i2/2. Note that if i2 = 1 (as in most normal
     * cases), then b = v2.
     */
  last_red = find_last_non_clamped(gamma->red, size);
  last_green = find_last_non_clamped(gamma->green, size);
  last_blue = find_last_non_clamped(gamma->blue, size);
  best_array = gamma->red;
  last_best = last_red;
  if (last_green > last_best)
  {
    last_best = last_green;
    best_array = gamma->green;
  }
  if (last_blue > last_best)
  {
    last_best = last_blue;
    best_array = gamma->blue;
  }
  if (last_best == 0)
    last_best = 1;

  middle = last_best / 2;
  i1 = (double)(middle + 1) / size;
  v1 = (double)(best_array[middle]) / 65535;
  i2 = (double)(last_best + 1) / size;
  v2 = (double)(best_array[last_best]) / 65535;
  if (v2 < 0.0001)
  { /* The screen is black */
    output->brightness = 0;
    output->gamma.red = 1;
    output->gamma.green = 1;
    output->gamma.blue = 1;
  }
  else
  {
    if ((last_best + 1) == size)
      output->brightness = v2;
    else
      output->brightness = exp((log(v2) * log(i1) - log(v1) * log(i2)) / log(i1 / i2));
    output->gamma.red = logf((gamma->red[last_red / 2]) / output->brightness / 65535) /
                        logf(((last_red / 2) + 1) / size);
    output->gamma.green = logf((gamma->green[last_green / 2]) / output->brightness / 65535) /
                          logf(((last_green / 2) + 1) / size);
    output->gamma.blue = logf((gamma->blue[last_blue / 2]) / output->brightness / 65535) /
                         logf(((last_blue / 2) + 1) / size);
  }

  XRRFreeGamma(gamma);
}

static void set_output_info(output_t* output, RROutput xid, XRROutputInfo* output_info)
{
  /* sanity check output info */
  if (output_info->connection != RR_Disconnected && !output_info->nmode)
    warning("Output %s is not disconnected but has no modes\n", output_info->name);

  /* set output name and info */
  if (!(output->output.kind & name_xid))
    set_name_xid(&output->output, xid);
  if (!(output->output.kind & name_string))
    set_name_string(&output->output, output_info->name);
  output->output_info = output_info;

  /* set crtc name and info */
  if (!(output->changes & changes_crtc))
    set_name_xid(&output->crtc, output_info->crtc);

  if (output->crtc.kind == name_xid && output->crtc.xid == None)
    output->crtc_info = NULL;
  else
  {
    output->crtc_info = find_crtc(&output->crtc);
    if (!output->crtc_info)
    {
      if (output->crtc.kind & name_xid)
        fatal("cannot find crtc 0x%x\n", output->crtc.xid);
      if (output->crtc.kind & name_index)
        fatal("cannot find crtc %d\n", output->crtc.index);
    }
    if (!output_can_use_crtc(output, output->crtc_info))
      fatal("output %s cannot use crtc 0x%x\n", output->output.string, output->crtc_info->crtc.xid);
  }

  /* set mode name and info */
  if (!(output->changes & changes_mode))
  {
    crtc_t* crtc = NULL;

    if (output_info->crtc)
      crtc = find_crtc_by_xid(output_info->crtc);
    if (crtc && crtc->crtc_info)
      set_name_xid(&output->mode, crtc->crtc_info->mode);
    else if (output->crtc_info)
      set_name_xid(&output->mode, output->crtc_info->crtc_info->mode);
    else
      set_name_xid(&output->mode, None);
    if (output->mode.xid)
    {
      output->mode_info = find_mode_by_xid(output->mode.xid);
      if (!output->mode_info)
        fatal("server did not report mode 0x%x for output %s\n", output->mode.xid,
              output->output.string);
    }
    else
      output->mode_info = NULL;
  }
  else if (output->mode.kind == name_xid && output->mode.xid == None)
    output->mode_info = NULL;
  else
  {
    if (output->mode.kind == name_preferred)
      output->mode_info = preferred_mode(output);
    else
      output->mode_info = find_mode_for_output(output, &output->mode);
    if (!output->mode_info)
    {
      if (output->mode.kind & name_preferred)
        fatal("cannot find preferred mode\n");
      if (output->mode.kind & name_string)
        fatal("cannot find mode %s\n", output->mode.string);
      if (output->mode.kind & name_xid)
        fatal("cannot find mode 0x%x\n", output->mode.xid);
    }
    if (!output_can_use_mode(output, output->mode_info))
      fatal("output %s cannot use mode %s\n", output->output.string, output->mode_info->name);
  }

  /* set position */
  if (!(output->changes & changes_position))
  {
    if (output->crtc_info)
    {
      output->x = output->crtc_info->crtc_info->x;
      output->y = output->crtc_info->crtc_info->y;
    }
    else
    {
      output->x = 0;
      output->y = 0;
    }
  }

  /* set rotation */
  if (!(output->changes & changes_rotation))
  {
    output->rotation &= ~0xf;
    if (output->crtc_info)
      output->rotation |= (output->crtc_info->crtc_info->rotation & 0xf);
    else
      output->rotation = RR_Rotate_0;
  }
  if (!(output->changes & changes_reflection))
  {
    output->rotation &= ~(RR_Reflect_X | RR_Reflect_Y);
    if (output->crtc_info)
      output->rotation |= (output->crtc_info->crtc_info->rotation & (RR_Reflect_X | RR_Reflect_Y));
  }
  if (!output_can_use_rotation(output, output->rotation))
    fatal("output %s cannot use rotation \"%s\" reflection \"%s\"\n", output->output.string,
          rotation_name(output->rotation), reflection_name(output->rotation));

  /* set gamma */
  if (!(output->changes & changes_gamma))
    set_gamma_info(output);

  /* set transformation */
  if (!(output->changes & changes_transform))
  {
    if (output->crtc_info)
      copy_transform(&output->transform, &output->crtc_info->current_transform);
    else
      init_transform(&output->transform);
  }
  else
  {
    /* transform was already set for --scale or --transform */

    /* for --scale-from, figure out the mode size and compute the transform
	 * for the target framebuffer area */
    if (output->scale_from_w > 0 && output->mode_info)
    {
      double sx = (double)output->scale_from_w / output->mode_info->width;
      double sy = (double)output->scale_from_h / output->mode_info->height;
      if (verbose)
        printf("scaling %s by %lfx%lf\n", output->output.string, sx, sy);
      init_transform(&output->transform);
      output->transform.transform.matrix[0][0] = XDoubleToFixed(sx);
      output->transform.transform.matrix[1][1] = XDoubleToFixed(sy);
      output->transform.transform.matrix[2][2] = XDoubleToFixed(1.0);
      if (sx != 1 || sy != 1)
        output->transform.filter = "bilinear";
      else
        output->transform.filter = "nearest";
      output->transform.nparams = 0;
      output->transform.params = NULL;
    }
  }

  /* set primary */
  if (!(output->changes & changes_primary))
    output->primary = output_is_primary(output);
}

static void get_screen(Bool current)
{
  if (!has_1_2)
    fatal("Server RandR version before 1.2\n");

  XRRGetScreenSizeRange(dpy, root, &minWidth, &minHeight, &maxWidth, &maxHeight);

  if (current)
    res = XRRGetScreenResourcesCurrent(dpy, root);
  else
    res = XRRGetScreenResources(dpy, root);
  if (!res)
    fatal("could not get screen resources");
}

static void get_crtcs(void)
{
  int c;

  num_crtcs = res->ncrtc;
  crtcs = calloc(num_crtcs, sizeof(crtc_t));
  if (!crtcs)
    fatal("out of memory\n");

  for (c = 0; c < res->ncrtc; c++)
  {
    XRRCrtcInfo* crtc_info = XRRGetCrtcInfo(dpy, res, res->crtcs[c]);
    XRRCrtcTransformAttributes* attr;
    XRRPanning* panning_info = NULL;

    if (has_1_3)
    {
      XRRPanning zero;
      memset(&zero, 0, sizeof(zero));
      panning_info = XRRGetPanning(dpy, res, res->crtcs[c]);
      zero.timestamp = panning_info->timestamp;
      if (!memcmp(panning_info, &zero, sizeof(zero)))
      {
        Xfree(panning_info);
        panning_info = NULL;
      }
    }

    set_name_xid(&crtcs[c].crtc, res->crtcs[c]);
    set_name_index(&crtcs[c].crtc, c);
    if (!crtc_info)
      fatal("could not get crtc 0x%x information\n", res->crtcs[c]);
    crtcs[c].crtc_info = crtc_info;
    crtcs[c].panning_info = panning_info;
    if (crtc_info->mode == None)
    {
      crtcs[c].mode_info = NULL;
      crtcs[c].x = 0;
      crtcs[c].y = 0;
      crtcs[c].rotation = RR_Rotate_0;
    }
    if (XRRGetCrtcTransform(dpy, res->crtcs[c], &attr) && attr)
    {
      set_transform(&crtcs[c].current_transform, &attr->currentTransform, attr->currentFilter,
                    attr->currentParams, attr->currentNparams);
      XFree(attr);
    }
    else
    {
      init_transform(&crtcs[c].current_transform);
    }
    copy_transform(&crtcs[c].pending_transform, &crtcs[c].current_transform);
  }
}

static void crtc_add_output(crtc_t* crtc, output_t* output)
{
  if (crtc->outputs)
    crtc->outputs = realloc(crtc->outputs, (crtc->noutput + 1) * sizeof(output_t*));
  else
  {
    crtc->outputs = malloc(sizeof(output_t*));
    crtc->x = output->x;
    crtc->y = output->y;
    crtc->rotation = output->rotation;
    crtc->mode_info = output->mode_info;
    copy_transform(&crtc->pending_transform, &output->transform);
  }
  if (!crtc->outputs)
    fatal("out of memory\n");
  crtc->outputs[crtc->noutput++] = output;
}

static void set_crtcs(void)
{
  output_t* output;

  for (output = outputs; output; output = output->next)
  {
    if (!output->mode_info)
      continue;
    crtc_add_output(output->crtc_info, output);
  }
}

static void set_panning(void)
{
  output_t* output;

  for (output = outputs; output; output = output->next)
  {
    if (!output->crtc_info)
      continue;
    if (!(output->changes & changes_panning))
      continue;
    if (!output->crtc_info->panning_info)
      output->crtc_info->panning_info = malloc(sizeof(XRRPanning));
    memcpy(output->crtc_info->panning_info, &output->panning, sizeof(XRRPanning));
    output->crtc_info->changing = 1;
  }
}

static void set_gamma(void)
{
  output_t* output;

  for (output = outputs; output; output = output->next)
  {
    int i, size;
    crtc_t* crtc;
    XRRCrtcGamma* gamma;

    if (!(output->changes & changes_gamma))
      continue;

    if (!output->crtc_info)
    {
      fatal("Need crtc to set gamma on.\n");
      continue;
    }

    crtc = output->crtc_info;

    size = XRRGetCrtcGammaSize(dpy, crtc->crtc.xid);

    if (!size)
    {
      fatal("Gamma size is 0.\n");
      continue;
    }

    gamma = XRRAllocGamma(size);
    if (!gamma)
    {
      fatal("Gamma allocation failed.\n");
      continue;
    }

    if (output->gamma.red == 0.0f && output->gamma.green == 0.0f && output->gamma.blue == 0.0f)
      output->gamma.red = output->gamma.green = output->gamma.blue = 1.0f;

    for (i = 0; i < size; i++)
    {
      if (output->gamma.red == 1.0f && output->brightness == 1.0f)
        gamma->red[i] = (i << 8) + i;
      else
        gamma->red[i] =
            min(powf((float)i / (float)(size - 1), output->gamma.red) * output->brightness, 1.0f) *
            65535.0f;

      if (output->gamma.green == 1.0f && output->brightness == 1.0f)
        gamma->green[i] = (i << 8) + i;
      else
        gamma->green[i] =
            min(powf((float)i / (float)(size - 1), output->gamma.green) * output->brightness,
                1.0f) *
            65535.0f;

      if (output->gamma.blue == 1.0f && output->brightness == 1.0f)
        gamma->blue[i] = (i << 8) + i;
      else
        gamma->blue[i] =
            min(powf((float)i / (float)(size - 1), output->gamma.blue) * output->brightness, 1.0f) *
            65535.0f;
    }

    XRRSetCrtcGamma(dpy, crtc->crtc.xid, gamma);

    free(gamma);
  }
}

static void set_primary(void)
{
  output_t* output;

  if (no_primary)
  {
    XRRSetOutputPrimary(dpy, root, None);
  }
  else
  {
    for (output = outputs; output; output = output->next)
    {
      if (!(output->changes & changes_primary))
        continue;
      if (output->primary)
        XRRSetOutputPrimary(dpy, root, output->output.xid);
    }
  }
}

static Status crtc_disable(crtc_t* crtc)
{
  if (verbose)
    printf("crtc %d: disable\n", crtc->crtc.index);

  if (dryrun)
    return RRSetConfigSuccess;
  return XRRSetCrtcConfig(dpy, res, crtc->crtc.xid, CurrentTime, 0, 0, None, RR_Rotate_0, NULL, 0);
}

static void crtc_set_transform(crtc_t* crtc, transform_t* transform)
{
  int major, minor;

  XRRQueryVersion(dpy, &major, &minor);
  if (major > 1 || (major == 1 && minor >= 3))
    XRRSetCrtcTransform(dpy, crtc->crtc.xid, &transform->transform, transform->filter,
                        transform->params, transform->nparams);
}

static Status crtc_revert(crtc_t* crtc)
{
  XRRCrtcInfo* crtc_info = crtc->crtc_info;

  if (verbose)
    printf("crtc %d: revert\n", crtc->crtc.index);

  if (dryrun)
    return RRSetConfigSuccess;

  if (!equal_transform(&crtc->current_transform, &crtc->pending_transform))
    crtc_set_transform(crtc, &crtc->current_transform);
  return XRRSetCrtcConfig(dpy, res, crtc->crtc.xid, CurrentTime, crtc_info->x, crtc_info->y,
                          crtc_info->mode, crtc_info->rotation, crtc_info->outputs,
                          crtc_info->noutput);
}

static Status crtc_apply(crtc_t* crtc)
{
  RROutput* rr_outputs;
  int o;
  Status s;
  RRMode mode = None;

  if (!crtc->changing || !crtc->mode_info)
    return RRSetConfigSuccess;

  rr_outputs = calloc(crtc->noutput, sizeof(RROutput));
  if (!rr_outputs)
    return BadAlloc;
  for (o = 0; o < crtc->noutput; o++)
    rr_outputs[o] = crtc->outputs[o]->output.xid;
  mode = crtc->mode_info->id;
  if (verbose)
  {
    printf("crtc %d: %12s %6.1f +%d+%d", crtc->crtc.index, crtc->mode_info->name,
           mode_refresh(crtc->mode_info), crtc->x, crtc->y);
    for (o = 0; o < crtc->noutput; o++)
      printf(" \"%s\"", crtc->outputs[o]->output.string);
    printf("\n");
  }

  if (dryrun)
    s = RRSetConfigSuccess;
  else
  {
    if (!equal_transform(&crtc->current_transform, &crtc->pending_transform))
      crtc_set_transform(crtc, &crtc->pending_transform);
    s = XRRSetCrtcConfig(dpy, res, crtc->crtc.xid, CurrentTime, crtc->x, crtc->y, mode,
                         crtc->rotation, rr_outputs, crtc->noutput);
    if (s == RRSetConfigSuccess && crtc->panning_info)
    {
      if (has_1_3)
        s = XRRSetPanning(dpy, res, crtc->crtc.xid, crtc->panning_info);
      else
        fatal("panning needs RandR 1.3\n");
    }
  }
  free(rr_outputs);
  return s;
}

static void screen_revert(void)
{
  if (verbose)
    printf("screen %d: revert\n", screen);

  if (dryrun)
    return;
  XRRSetScreenSize(dpy, root, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
                   DisplayWidthMM(dpy, screen), DisplayHeightMM(dpy, screen));
}

static void screen_apply(void)
{
  if (fb_width == DisplayWidth(dpy, screen) && fb_height == DisplayHeight(dpy, screen) &&
      fb_width_mm == DisplayWidthMM(dpy, screen) && fb_height_mm == DisplayHeightMM(dpy, screen))
  {
    return;
  }
  if (verbose)
    printf("screen %d: %dx%d %dx%d mm %6.2fdpi\n", screen, fb_width, fb_height, fb_width_mm,
           fb_height_mm, dpi);
  if (dryrun)
    return;
  XRRSetScreenSize(dpy, root, fb_width, fb_height, fb_width_mm, fb_height_mm);
}

static void revert(void)
{
  int c;

  /* first disable all crtcs */
  for (c = 0; c < res->ncrtc; c++)
    crtc_disable(&crtcs[c]);
  /* next reset screen size */
  screen_revert();
  /* now restore all crtcs */
  for (c = 0; c < res->ncrtc; c++)
    crtc_revert(&crtcs[c]);
}

/*
 * uh-oh, something bad happened in the middle of changing
 * the configuration. Revert to the previous configuration
 * and bail
 */
static void _X_NORETURN panic(Status s, crtc_t* crtc)
{
  int c = crtc->crtc.index;
  char* message;

  switch (s)
  {
    case RRSetConfigSuccess:
      message = "succeeded";
      break;
    case BadAlloc:
      message = "out of memory";
      break;
    case RRSetConfigFailed:
      message = "failed";
      break;
    case RRSetConfigInvalidConfigTime:
      message = "invalid config time";
      break;
    case RRSetConfigInvalidTime:
      message = "invalid time";
      break;
    default:
      message = "unknown failure";
      break;
  }

  fprintf(stderr, "%s: Configure crtc %d %s\n", program_name, c, message);
  revert();
  exit(1);
}

static void apply(void)
{
  Status s;
  int c;

  /*
     * Hold the server grabbed while messing with
     * the screen so that apps which notice the resize
     * event and ask for xinerama information from the server
     * receive up-to-date information
     */
  if (grab_server)
    XGrabServer(dpy);

  /*
     * Turn off any crtcs which are to be disabled or which are
     * larger than the target size
     */
  for (c = 0; c < res->ncrtc; c++)
  {
    crtc_t* crtc = &crtcs[c];
    XRRCrtcInfo* crtc_info = crtc->crtc_info;

    /* if this crtc is already disabled, skip it */
    if (crtc_info->mode == None)
      continue;

    /*
	 * If this crtc is to be left enabled, make
	 * sure the old size fits then new screen
	 */
    if (crtc->mode_info)
    {
      XRRModeInfo* old_mode = find_mode_by_xid(crtc_info->mode);
      int x, y, w, h;
      box_t bounds;

      if (!old_mode)
        panic(RRSetConfigFailed, crtc);

      /* old position and size information */
      mode_geometry(old_mode, crtc_info->rotation, &crtc->current_transform.transform, &bounds);

      x = crtc_info->x + bounds.x1;
      y = crtc_info->y + bounds.y1;
      w = bounds.x2 - bounds.x1;
      h = bounds.y2 - bounds.y1;

      /* if it fits, skip it */
      if (x + w <= fb_width && y + h <= fb_height)
        continue;
      crtc->changing = True;
    }
    s = crtc_disable(crtc);
    if (s != RRSetConfigSuccess)
      panic(s, crtc);
  }

  /*
     * Set the screen size
     */
  screen_apply();

  /*
     * Set crtcs
     */

  for (c = 0; c < res->ncrtc; c++)
  {
    crtc_t* crtc = &crtcs[c];

    s = crtc_apply(crtc);
    if (s != RRSetConfigSuccess)
      panic(s, crtc);
  }

  set_primary();

  /*
     * Release the server grab and let all clients
     * respond to the updated state
     */
  if (grab_server)
    XUngrabServer(dpy);
}

/*
 * Use current output state to complete the output list
 */
static void get_outputs(void)
{
  int o;
  output_t* q;

  for (o = 0; o < res->noutput; o++)
  {
    XRROutputInfo* output_info = XRRGetOutputInfo(dpy, res, res->outputs[o]);
    output_t* output;
    name_t output_name;
    if (!output_info)
      fatal("could not get output 0x%x information\n", res->outputs[o]);
    init_name(&output_name);
    set_name_xid(&output_name, res->outputs[o]);
    set_name_index(&output_name, o);
    set_name_string(&output_name, output_info->name);
    output = find_output(&output_name);
    if (!output)
    {
      output = add_output();
      set_name_all(&output->output, &output_name);
      /*
	     * When global --automatic mode is set, turn on connected but off
	     * outputs, turn off disconnected but on outputs
	     */
      if (automatic)
      {
        switch (output_info->connection)
        {
          case RR_Connected:
            if (!output_info->crtc)
            {
              output->changes |= changes_automatic;
              output->automatic = True;
            }
            break;
          case RR_Disconnected:
            if (output_info->crtc)
            {
              output->changes |= changes_automatic;
              output->automatic = True;
            }
            break;
        }
      }
    }
    output->found = True;

    /*
	 * Automatic mode -- track connection state and enable/disable outputs
	 * as necessary
	 */
    if (output->automatic)
    {
      switch (output_info->connection)
      {
        case RR_Connected:
        case RR_UnknownConnection:
          if ((!(output->changes & changes_mode)))
          {
            set_name_preferred(&output->mode);
            output->changes |= changes_mode;
          }
          break;
        case RR_Disconnected:
          if ((!(output->changes & changes_mode)))
          {
            set_name_xid(&output->mode, None);
            set_name_xid(&output->crtc, None);
            output->changes |= changes_mode;
            output->changes |= changes_crtc;
          }
          break;
      }
    }

    set_output_info(output, res->outputs[o], output_info);
  }
  for (q = outputs; q; q = q->next)
  {
    if (!q->found)
    {
      fprintf(stderr, "warning: output %s not found; ignoring\n", q->output.string);
    }
  }
}

static void mark_changing_crtcs(void)
{
  int c;

  for (c = 0; c < num_crtcs; c++)
  {
    crtc_t* crtc = &crtcs[c];
    int o;
    output_t* output;

    /* walk old output list (to catch disables) */
    for (o = 0; o < crtc->crtc_info->noutput; o++)
    {
      output = find_output_by_xid(crtc->crtc_info->outputs[o]);
      if (!output)
        fatal("cannot find output 0x%x\n", crtc->crtc_info->outputs[o]);
      if (output->changes)
        crtc->changing = True;
    }
    /* walk new output list */
    for (o = 0; o < crtc->noutput; o++)
    {
      output = crtc->outputs[o];
      if (output->changes)
        crtc->changing = True;
    }
  }
}

/*
 * Test whether 'crtc' can be used for 'output'
 */
static Bool check_crtc_for_output(crtc_t* crtc, output_t* output)
{
  int c;
  int l;
  output_t* other;

  for (c = 0; c < output->output_info->ncrtc; c++)
    if (output->output_info->crtcs[c] == crtc->crtc.xid)
      break;
  if (c == output->output_info->ncrtc)
    return False;
  for (other = outputs; other; other = other->next)
  {
    if (other == output)
      continue;

    if (other->mode_info == NULL)
      continue;

    if (other->crtc_info != crtc)
      continue;

    /* see if the output connected to the crtc can clone to this output */
    for (l = 0; l < output->output_info->nclone; l++)
      if (output->output_info->clones[l] == other->output.xid)
        break;
    /* not on the list, can't clone */
    if (l == output->output_info->nclone)
      return False;
  }

  if (crtc->noutput)
  {
    /* make sure the state matches */
    if (crtc->mode_info != output->mode_info)
      return False;
    if (crtc->x != output->x)
      return False;
    if (crtc->y != output->y)
      return False;
    if (crtc->rotation != output->rotation)
      return False;
    if (!equal_transform(&crtc->current_transform, &output->transform))
      return False;
  }
  else if (crtc->crtc_info->noutput)
  {
    /* make sure the state matches the already used state */
    XRRModeInfo* mode = find_mode_by_xid(crtc->crtc_info->mode);

    if (mode != output->mode_info)
      return False;
    if (crtc->crtc_info->x != output->x)
      return False;
    if (crtc->crtc_info->y != output->y)
      return False;
    if (crtc->crtc_info->rotation != output->rotation)
      return False;
  }
  return True;
}

static crtc_t* find_crtc_for_output(output_t* output)
{
  int c;

  for (c = 0; c < output->output_info->ncrtc; c++)
  {
    crtc_t* crtc;

    crtc = find_crtc_by_xid(output->output_info->crtcs[c]);
    if (!crtc)
      fatal("cannot find crtc 0x%x\n", output->output_info->crtcs[c]);

    if (check_crtc_for_output(crtc, output))
      return crtc;
  }
  return NULL;
}

static void set_positions(void)
{
  output_t* output;
  Bool keep_going;
  Bool any_set;
  int min_x, min_y;

  for (;;)
  {
    any_set = False;
    keep_going = False;
    for (output = outputs; output; output = output->next)
    {
      output_t* relation;
      name_t relation_name;

      if (!(output->changes & changes_relation))
        continue;

      if (output->mode_info == NULL)
        continue;

      init_name(&relation_name);
      set_name_string(&relation_name, output->relative_to);
      relation = find_output(&relation_name);
      if (!relation)
        fatal("cannot find output \"%s\"\n", output->relative_to);

      if (relation->mode_info == NULL)
      {
        output->x = 0;
        output->y = 0;
        output->changes |= changes_position;
        any_set = True;
        continue;
      }
      /*
	     * Make sure the dependent object has been set in place
	     */
      if ((relation->changes & changes_relation) && !(relation->changes & changes_position))
      {
        keep_going = True;
        continue;
      }

      switch (output->relation)
      {
        case relation_left_of:
          output->y = relation->y;
          output->x = relation->x - mode_width(output->mode_info, output->rotation);
          break;
        case relation_right_of:
          output->y = relation->y;
          output->x = relation->x + mode_width(relation->mode_info, relation->rotation);
          break;
        case relation_above:
          output->x = relation->x;
          output->y = relation->y - mode_height(output->mode_info, output->rotation);
          break;
        case relation_below:
          output->x = relation->x;
          output->y = relation->y + mode_height(relation->mode_info, relation->rotation);
          break;
        case relation_same_as:
          output->x = relation->x;
          output->y = relation->y;
      }
      output->changes |= changes_position;
      any_set = True;
    }
    if (!keep_going)
      break;
    if (!any_set)
      fatal("loop in relative position specifications\n");
  }

  /*
     * Now normalize positions so the upper left corner of all outputs is at 0,0
     */
  min_x = 32768;
  min_y = 32768;
  for (output = outputs; output; output = output->next)
  {
    if (output->mode_info == NULL)
      continue;

    if (output->x < min_x)
      min_x = output->x;
    if (output->y < min_y)
      min_y = output->y;
  }
  if (min_x || min_y)
  {
    /* move all outputs */
    for (output = outputs; output; output = output->next)
    {
      if (output->mode_info == NULL)
        continue;

      output->x -= min_x;
      output->y -= min_y;
      output->changes |= changes_position;
    }
  }
}

static void set_screen_size(void)
{
  output_t* output;
  Bool fb_specified = fb_width != 0 && fb_height != 0;

  for (output = outputs; output; output = output->next)
  {
    XRRModeInfo* mode_info = output->mode_info;
    int x, y, w, h;
    box_t bounds;

    if (!mode_info)
      continue;

    mode_geometry(mode_info, output->rotation, &output->transform.transform, &bounds);
    x = output->x + bounds.x1;
    y = output->y + bounds.y1;
    w = bounds.x2 - bounds.x1;
    h = bounds.y2 - bounds.y1;
    /* make sure output fits in specified size */
    if (fb_specified)
    {
      if (x + w > fb_width || y + h > fb_height)
        warning("specified screen %dx%d not large enough for output %s (%dx%d+%d+%d)\n", fb_width,
                fb_height, output->output.string, w, h, x, y);
    }
    /* fit fb to output */
    else
    {
      XRRPanning* pan;
      if (x + w > fb_width)
        fb_width = x + w;
      if (y + h > fb_height)
        fb_height = y + h;
      if (output->changes & changes_panning)
        pan = &output->panning;
      else
        pan = output->crtc_info ? output->crtc_info->panning_info : NULL;
      if (pan && pan->left + pan->width > (unsigned int)fb_width)
        fb_width = pan->left + pan->width;
      if (pan && pan->top + pan->height > (unsigned int)fb_height)
        fb_height = pan->top + pan->height;
    }
  }

  if (fb_width > maxWidth || fb_height > maxHeight)
    fatal("screen cannot be larger than %dx%d (desired size %dx%d)\n", maxWidth, maxHeight,
          fb_width, fb_height);
  if (fb_specified)
  {
    if (fb_width < minWidth || fb_height < minHeight)
      fatal("screen must be at least %dx%d\n", minWidth, minHeight);
  }
  else
  {
    if (fb_width < minWidth)
      fb_width = minWidth;
    if (fb_height < minHeight)
      fb_height = minHeight;
  }
}


static void disable_outputs(output_t* outputs)
{
  while (outputs)
  {
    outputs->crtc_info = NULL;
    outputs = outputs->next;
  }
}

/*
 * find the best mapping from output to crtc available
 */
static int pick_crtcs_score(output_t* outputs)
{
  output_t* output;
  int best_score;
  int my_score;
  int score;
  crtc_t* best_crtc;
  int c;

  if (!outputs)
    return 0;

  output = outputs;
  outputs = outputs->next;
  /*
     * Score with this output disabled
     */
  output->crtc_info = NULL;
  best_score = pick_crtcs_score(outputs);
  if (output->mode_info == NULL)
    return best_score;

  best_crtc = NULL;
  /*
     * Now score with this output any valid crtc
     */
  for (c = 0; c < output->output_info->ncrtc; c++)
  {
    crtc_t* crtc;

    crtc = find_crtc_by_xid(output->output_info->crtcs[c]);
    if (!crtc)
      fatal("cannot find crtc 0x%x\n", output->output_info->crtcs[c]);

    /* reset crtc allocation for following outputs */
    disable_outputs(outputs);
    if (!check_crtc_for_output(crtc, output))
      continue;

    my_score = 1000;
    /* slight preference for existing connections */
    if (crtc == output->current_crtc_info)
      my_score++;

    output->crtc_info = crtc;
    score = my_score + pick_crtcs_score(outputs);
    if (score > best_score)
    {
      best_crtc = crtc;
      best_score = score;
    }
  }
  if (output->crtc_info != best_crtc)
    output->crtc_info = best_crtc;
  /*
     * Reset other outputs based on this one using the best crtc
     */
  (void)pick_crtcs_score(outputs);

  return best_score;
}

/*
 * Pick crtcs for any changing outputs that don't have one
 */
static void pick_crtcs(void)
{
  output_t* output;

  /*
     * First try to match up newly enabled outputs with spare crtcs
     */
  for (output = outputs; output; output = output->next)
  {
    if (output->changes && output->mode_info)
    {
      if (output->crtc_info)
      {
        if (output->crtc_info->crtc_info->noutput > 0 &&
            (output->crtc_info->crtc_info->noutput > 1 ||
             output != find_output_by_xid(output->crtc_info->crtc_info->outputs[0])))
          break;
      }
      else
      {
        output->crtc_info = find_crtc_for_output(output);
        if (!output->crtc_info)
          break;
      }
    }
  }
  /*
     * Everyone is happy
     */
  if (!output)
    return;
  /*
     * When the simple way fails, see if there is a way
     * to swap crtcs around and make things work
     */
  for (output = outputs; output; output = output->next)
    output->current_crtc_info = output->crtc_info;
  pick_crtcs_score(outputs);
  for (output = outputs; output; output = output->next)
  {
    if (output->mode_info && !output->crtc_info)
      fatal("cannot find crtc for output %s\n", output->output.string);
    if (!output->changes && output->crtc_info != output->current_crtc_info)
      output->changes |= changes_crtc;
  }
}

static int check_strtol(char* s)
{
  char* endptr;
  int result = strtol(s, &endptr, 10);
  if (s == endptr)
    usage();
  return result;
}

static double check_strtod(char* s)
{
  char* endptr;
  double result = strtod(s, &endptr);
  if (s == endptr)
    usage();
  return result;
}

int main(int argc, char** argv)
{
  XRRScreenSize* sizes;
  XRRScreenConfiguration* sc;
  int nsize;
  int nrate;
  short* rates;
  Status status = RRSetConfigFailed;
  int rot = -1;
  int query = False;
  int action_requested = False;
  Rotation rotation, current_rotation, rotations;
  XRRScreenChangeNotifyEvent event;
  XRRScreenChangeNotifyEvent* sce;
  char* display_name = NULL;
  int i, j;
  SizeID current_size;
  short current_rate;
  double rate = -1;
  int size = -1;
  int dirind = 0;
  Bool setit = False;
  Bool version = False;
  int event_base, error_base;
  int reflection = 0;
  int width = 0, height = 0;
  Bool have_pixel_size = False;
  int ret = 0;
  output_t* output = NULL;
  Bool setit_1_2 = False;
  Bool query_1_2 = False;
  Bool modeit = False;
  Bool propit = False;
  Bool query_1 = False;
  int major, minor;
  Bool current = False;

  program_name = argv[0];
  for (i = 1; i < argc; i++)
  {
    if (!strcmp("-display", argv[i]) || !strcmp("-d", argv[i]))
    {
      if (++i >= argc)
        usage();
      display_name = argv[i];
      continue;
    }
    if (!strcmp("-help", argv[i]))
    {
      usage();
      action_requested = True;
      continue;
    }
    if (!strcmp("--verbose", argv[i]))
    {
      verbose = True;
      continue;
    }
    if (!strcmp("--dryrun", argv[i]))
    {
      dryrun = True;
      verbose = True;
      continue;
    }
    if (!strcmp("--nograb", argv[i]))
    {
      grab_server = False;
      continue;
    }
    if (!strcmp("--current", argv[i]))
    {
      current = True;
      continue;
    }

    if (!strcmp("-s", argv[i]) || !strcmp("--size", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%dx%d", &width, &height) == 2)
      {
        have_pixel_size = True;
      }
      else
      {
        size = check_strtol(argv[i]);
        if (size < 0)
          usage();
      }
      setit = True;
      action_requested = True;
      continue;
    }

    if (!strcmp("-r", argv[i]) || !strcmp("--rate", argv[i]) || !strcmp("--refresh", argv[i]))
    {
      if (++i >= argc)
        usage();
      rate = check_strtod(argv[i]);
      setit = True;
      if (output)
      {
        output->refresh = rate;
        output->changes |= changes_refresh;
        setit_1_2 = True;
      }
      action_requested = True;
      continue;
    }

    if (!strcmp("-v", argv[i]) || !strcmp("--version", argv[i]))
    {
      version = True;
      action_requested = True;
      continue;
    }

    if (!strcmp("-x", argv[i]))
    {
      reflection |= RR_Reflect_X;
      setit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("-y", argv[i]))
    {
      reflection |= RR_Reflect_Y;
      setit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--screen", argv[i]))
    {
      if (++i >= argc)
        usage();
      screen = check_strtol(argv[i]);
      if (screen < 0)
        usage();
      continue;
    }
    if (!strcmp("-q", argv[i]) || !strcmp("--query", argv[i]))
    {
      query = True;
      continue;
    }
    if (!strcmp("-o", argv[i]) || !strcmp("--orientation", argv[i]))
    {
      char* endptr;
      if (++i >= argc)
        usage();
      dirind = strtol(argv[i], &endptr, 10);
      if (argv[i] == endptr)
      {
        for (dirind = 0; dirind < 4; dirind++)
        {
          if (strcmp(direction[dirind], argv[i]) == 0)
            break;
        }
        if ((dirind < 0) || (dirind > 3))
          usage();
      }
      rot = dirind;
      setit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--prop", argv[i]) || !strcmp("--props", argv[i]) ||
        !strcmp("--madprops", argv[i]) || !strcmp("--properties", argv[i]))
    {
      query_1_2 = True;
      properties = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--output", argv[i]))
    {
      if (++i >= argc)
        usage();

      output = find_output_by_name(argv[i]);
      if (!output)
      {
        output = add_output();
        set_name(&output->output, argv[i], name_string | name_xid);
      }

      setit_1_2 = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--crtc", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      set_name(&output->crtc, argv[i], name_xid | name_index);
      output->changes |= changes_crtc;
      continue;
    }
    if (!strcmp("--mode", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      set_name(&output->mode, argv[i], name_string | name_xid);
      output->changes |= changes_mode;
      continue;
    }
    if (!strcmp("--preferred", argv[i]))
    {
      if (!output)
        usage();
      set_name_preferred(&output->mode);
      output->changes |= changes_mode;
      continue;
    }
    if (!strcmp("--pos", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      if (sscanf(argv[i], "%dx%d", &output->x, &output->y) != 2)
        usage();
      output->changes |= changes_position;
      continue;
    }
    if (!strcmp("--rotation", argv[i]) || !strcmp("--rotate", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      for (dirind = 0; dirind < 4; dirind++)
      {
        if (strcmp(direction[dirind], argv[i]) == 0)
          break;
      }
      if (dirind == 4)
        usage();
      output->rotation &= ~0xf;
      output->rotation |= 1 << dirind;
      output->changes |= changes_rotation;
      continue;
    }
    if (!strcmp("--reflect", argv[i]) || !strcmp("--reflection", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      for (dirind = 0; dirind < 4; dirind++)
      {
        if (strcmp(reflections[dirind], argv[i]) == 0)
          break;
      }
      if (dirind == 4)
        usage();
      output->rotation &= ~(RR_Reflect_X | RR_Reflect_Y);
      output->rotation |= dirind * RR_Reflect_X;
      output->changes |= changes_reflection;
      continue;
    }
    if (!strcmp("--left-of", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      output->relation = relation_left_of;
      output->relative_to = argv[i];
      output->changes |= changes_relation;
      continue;
    }
    if (!strcmp("--right-of", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      output->relation = relation_right_of;
      output->relative_to = argv[i];
      output->changes |= changes_relation;
      continue;
    }
    if (!strcmp("--above", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      output->relation = relation_above;
      output->relative_to = argv[i];
      output->changes |= changes_relation;
      continue;
    }
    if (!strcmp("--below", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      output->relation = relation_below;
      output->relative_to = argv[i];
      output->changes |= changes_relation;
      continue;
    }
    if (!strcmp("--same-as", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      output->relation = relation_same_as;
      output->relative_to = argv[i];
      output->changes |= changes_relation;
      continue;
    }
    if (!strcmp("--panning", argv[i]))
    {
      XRRPanning* pan;
      if (++i >= argc)
        usage();
      if (!output)
        usage();
      pan = &output->panning;
      switch (sscanf(argv[i], "%dx%d+%d+%d/%dx%d+%d+%d/%d/%d/%d/%d", &pan->width, &pan->height,
                     &pan->left, &pan->top, &pan->track_width, &pan->track_height, &pan->track_left,
                     &pan->track_top, &pan->border_left, &pan->border_top, &pan->border_right,
                     &pan->border_bottom))
      {
        case 2:
          pan->left = pan->top = 0;
          /* fall through */
          __attribute__((fallthrough));
        case 4:
          pan->track_left = pan->track_top = pan->track_width = pan->track_height = 0;
          /* fall through */
          __attribute__((fallthrough));
        case 8:
          pan->border_left = pan->border_top = pan->border_right = pan->border_bottom = 0;
          /* fall through */
          __attribute__((fallthrough));
        case 12:
          break;
        default:
          usage();
      }
      output->changes |= changes_panning;
      continue;
    }
    if (!strcmp("--gamma", argv[i]))
    {
      if (!output)
        usage();
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%f:%f:%f", &output->gamma.red, &output->gamma.green,
                 &output->gamma.blue) != 3)
        usage();
      output->changes |= changes_gamma;
      setit_1_2 = True;
      continue;
    }
    if (!strcmp("--brightness", argv[i]))
    {
      if (!output)
        usage();
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%f", &output->brightness) != 1)
        usage();
      output->changes |= changes_gamma;
      setit_1_2 = True;
      continue;
    }
    if (!strcmp("--primary", argv[i]))
    {
      if (!output)
        usage();
      output->changes |= changes_primary;
      output->primary = True;
      setit_1_2 = True;
      continue;
    }
    if (!strcmp("--noprimary", argv[i]))
    {
      no_primary = True;
      setit_1_2 = True;
      continue;
    }
    if (!strcmp("--set", argv[i]))
    {
      output_prop_t* prop;
      if (!output)
        usage();
      prop = malloc(sizeof(output_prop_t));
      prop->next = output->props;
      output->props = prop;
      if (++i >= argc)
        usage();
      prop->name = argv[i];
      if (++i >= argc)
        usage();
      prop->value = argv[i];
      propit = True;
      output->changes |= changes_property;
      setit_1_2 = True;
      continue;
    }
    if (!strcmp("--scale", argv[i]))
    {
      double sx, sy;
      if (!output)
        usage();
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%lfx%lf", &sx, &sy) != 2)
        usage();
      init_transform(&output->transform);
      output->transform.transform.matrix[0][0] = XDoubleToFixed(sx);
      output->transform.transform.matrix[1][1] = XDoubleToFixed(sy);
      output->transform.transform.matrix[2][2] = XDoubleToFixed(1.0);
      if (sx != 1 || sy != 1)
        output->transform.filter = "bilinear";
      else
        output->transform.filter = "nearest";
      output->transform.nparams = 0;
      output->transform.params = NULL;
      output->changes |= changes_transform;
      continue;
    }
    if (!strcmp("--scale-from", argv[i]))
    {
      int w, h;
      if (!output)
        usage();
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%dx%d", &w, &h) != 2)
        usage();
      if (w <= 0 || h <= 0)
        usage();
      output->scale_from_w = w;
      output->scale_from_h = h;
      output->changes |= changes_transform;
      continue;
    }
    if (!strcmp("--transform", argv[i]))
    {
      double transform[3][3];
      int k, l;
      if (!output)
        usage();
      if (++i >= argc)
        usage();
      init_transform(&output->transform);
      if (strcmp(argv[i], "none") != 0)
      {
        if (sscanf(argv[i], "%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf", &transform[0][0],
                   &transform[0][1], &transform[0][2], &transform[1][0], &transform[1][1],
                   &transform[1][2], &transform[2][0], &transform[2][1], &transform[2][2]) != 9)
          usage();
        init_transform(&output->transform);
        for (k = 0; k < 3; k++)
          for (l = 0; l < 3; l++)
          {
            output->transform.transform.matrix[k][l] = XDoubleToFixed(transform[k][l]);
          }
        output->transform.filter = "bilinear";
        output->transform.nparams = 0;
        output->transform.params = NULL;
      }
      output->changes |= changes_transform;
      continue;
    }
    if (!strcmp("--off", argv[i]))
    {
      if (!output)
        usage();
      set_name_xid(&output->mode, None);
      set_name_xid(&output->crtc, None);
      output->changes |= changes_mode;
      continue;
    }
    if (!strcmp("--fb", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%dx%d", &fb_width, &fb_height) != 2)
        usage();
      setit_1_2 = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--fbmm", argv[i]))
    {
      if (++i >= argc)
        usage();
      if (sscanf(argv[i], "%dx%d", &fb_width_mm, &fb_height_mm) != 2)
        usage();
      setit_1_2 = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--dpi", argv[i]))
    {
      char* strtod_error;
      if (++i >= argc)
        usage();
      dpi = strtod(argv[i], &strtod_error);
      if (argv[i] == strtod_error)
      {
        dpi = 0.0;
        dpi_output = argv[i];
      }
      setit_1_2 = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--auto", argv[i]))
    {
      if (output)
      {
        output->automatic = True;
        output->changes |= changes_automatic;
      }
      else
        automatic = True;
      setit_1_2 = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--q12", argv[i]))
    {
      query_1_2 = True;
      continue;
    }
    if (!strcmp("--q1", argv[i]))
    {
      query_1 = True;
      continue;
    }
    if (!strcmp("--newmode", argv[i]))
    {
      umode_t* m = malloc(sizeof(umode_t));
      double clock;

      ++i;
      if (i + 9 >= argc)
        usage();
      m->mode.name = argv[i];
      m->mode.nameLength = strlen(argv[i]);
      i++;
      clock = check_strtod(argv[i++]);
      m->mode.dotClock = clock * 1e6;

      m->mode.width = check_strtol(argv[i++]);
      m->mode.hSyncStart = check_strtol(argv[i++]);
      m->mode.hSyncEnd = check_strtol(argv[i++]);
      m->mode.hTotal = check_strtol(argv[i++]);
      m->mode.height = check_strtol(argv[i++]);
      m->mode.vSyncStart = check_strtol(argv[i++]);
      m->mode.vSyncEnd = check_strtol(argv[i++]);
      m->mode.vTotal = check_strtol(argv[i++]);
      m->mode.modeFlags = 0;
      while (i < argc)
      {
        int f;

        for (f = 0; mode_flags[f].string; f++)
          if (!strcasecmp(mode_flags[f].string, argv[i]))
            break;

        if (!mode_flags[f].string)
          break;
        m->mode.modeFlags |= mode_flags[f].flag;
        i++;
      }
      m->next = umodes;
      m->action = umode_create;
      umodes = m;
      modeit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--rmmode", argv[i]))
    {
      umode_t* m = malloc(sizeof(umode_t));

      if (++i >= argc)
        usage();
      set_name(&m->name, argv[i], name_string | name_xid);
      m->action = umode_destroy;
      m->next = umodes;
      umodes = m;
      modeit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--addmode", argv[i]))
    {
      umode_t* m = malloc(sizeof(umode_t));

      if (++i >= argc)
        usage();
      set_name(&m->output, argv[i], name_string | name_xid);
      if (++i >= argc)
        usage();
      set_name(&m->name, argv[i], name_string | name_xid);
      m->action = umode_add;
      m->next = umodes;
      umodes = m;
      modeit = True;
      action_requested = True;
      continue;
    }
    if (!strcmp("--delmode", argv[i]))
    {
      umode_t* m = malloc(sizeof(umode_t));

      if (++i >= argc)
        usage();
      set_name(&m->output, argv[i], name_string | name_xid);
      if (++i >= argc)
        usage();
      set_name(&m->name, argv[i], name_string | name_xid);
      m->action = umode_delete;
      m->next = umodes;
      umodes = m;
      modeit = True;
      action_requested = True;
      continue;
    }
    usage();
  }
  if (!action_requested)
    query = True;
  if (verbose)
  {
    query = True;
    if (setit && !setit_1_2)
      query_1 = True;
  }

  /*
    if (version)
	printf("xrandr program version       " VERSION "\n");
*/

  dpy = XOpenDisplay(display_name);

  if (dpy == NULL)
  {
    fprintf(stderr, "Can't open display %s\n", XDisplayName(display_name));
    exit(1);
  }
  if (screen < 0)
    screen = DefaultScreen(dpy);
  if (screen >= ScreenCount(dpy))
  {
    fprintf(stderr, "Invalid screen number %d (display has %d)\n", screen, ScreenCount(dpy));
    exit(1);
  }

  root = RootWindow(dpy, screen);

  if (!XRRQueryExtension(dpy, &event_base, &error_base) || !XRRQueryVersion(dpy, &major, &minor))
  {
    fprintf(stderr, "RandR extension missing\n");
    exit(1);
  }
  if (major > 1 || (major == 1 && minor >= 2))
    has_1_2 = True;
  if (major > 1 || (major == 1 && minor >= 3))
    has_1_3 = True;

  if (has_1_2 && modeit)
  {
    umode_t* m;

    get_screen(current);
    get_crtcs();
    get_outputs();

    for (m = umodes; m; m = m->next)
    {
      XRRModeInfo* e;
      output_t* o;

      switch (m->action)
      {
        case umode_create:
          XRRCreateMode(dpy, root, &m->mode);
          break;
        case umode_destroy:
          e = find_mode(&m->name, 0);
          if (!e)
            fatal("cannot find mode \"%s\"\n", m->name.string);
          XRRDestroyMode(dpy, e->id);
          break;
        case umode_add:
          o = find_output(&m->output);
          if (!o)
            fatal("cannot find output \"%s\"\n", m->output.string);
          e = find_mode(&m->name, 0);
          if (!e)
            fatal("cannot find mode \"%s\"\n", m->name.string);
          XRRAddOutputMode(dpy, o->output.xid, e->id);
          break;
        case umode_delete:
          o = find_output(&m->output);
          if (!o)
            fatal("cannot find output \"%s\"\n", m->output.string);
          e = find_mode(&m->name, 0);
          if (!e)
            fatal("cannot find mode \"%s\"\n", m->name.string);
          XRRDeleteOutputMode(dpy, o->output.xid, e->id);
          break;
      }
    }
    if (!setit_1_2)
    {
      XSync(dpy, False);
      exit(0);
    }
  }
  if (has_1_2 && propit)
  {

    get_screen(current);
    get_crtcs();
    get_outputs();

    for (output = outputs; output; output = output->next)
    {
      output_prop_t* prop;

      for (prop = output->props; prop; prop = prop->next)
      {
        Atom name = XInternAtom(dpy, prop->name, False);
        Atom type;
        int format = 0;
        unsigned char* data;
        int nelements;
        int int_value;
        unsigned long ulong_value;
        unsigned char* prop_data;
        int actual_format;
        unsigned long nitems, bytes_after;
        Atom actual_type;
        XRRPropertyInfo* propinfo;

        type = AnyPropertyType;

        if (XRRGetOutputProperty(dpy, output->output.xid, name, 0, 100, False, False,
                                 AnyPropertyType, &actual_type, &actual_format, &nitems,
                                 &bytes_after, &prop_data) == Success &&

            (propinfo = XRRQueryOutputProperty(dpy, output->output.xid, name)))
        {
          type = actual_type;
          format = actual_format;
        }

        if ((type == XA_INTEGER || type == AnyPropertyType) &&
            (sscanf(prop->value, "%d", &int_value) == 1 ||
             sscanf(prop->value, "0x%x", &int_value) == 1))
        {
          type = XA_INTEGER;
          ulong_value = int_value;
          data = (unsigned char*)&ulong_value;
          nelements = 1;
          format = 32;
        }
        else if (type == XA_ATOM)
        {
          ulong_value = XInternAtom(dpy, prop->value, False);
          data = (unsigned char*)&ulong_value;
          nelements = 1;
        }
        else if ((type == XA_STRING || type == AnyPropertyType))
        {
          type = XA_STRING;
          data = (unsigned char*)prop->value;
          nelements = strlen(prop->value);
          format = 8;
        }
        else
          continue;
        XRRChangeOutputProperty(dpy, output->output.xid, name, type, format, PropModeReplace, data,
                                nelements);
      }
    }
    if (!setit_1_2)
    {
      XSync(dpy, False);
      exit(0);
    }
  }
  if (setit_1_2)
  {
    get_screen(current);
    get_crtcs();
    get_outputs();
    set_positions();
    set_screen_size();

    pick_crtcs();

    /*
	 * Assign outputs to crtcs
	 */
    set_crtcs();

    /*
	 * Mark changing crtcs
	 */
    mark_changing_crtcs();

    /*
	 * If an output was specified to track dpi, use it
	 */
    if (dpi_output)
    {
      output_t* output = find_output_by_name(dpi_output);
      XRROutputInfo* output_info;
      XRRModeInfo* mode_info;
      if (!output)
        fatal("Cannot find output %s\n", dpi_output);
      output_info = output->output_info;
      mode_info = output->mode_info;
      if (output_info && mode_info && output_info->mm_height)
      {
        /*
		 * When this output covers the whole screen, just use
		 * the known physical size
		 */
        if ((unsigned int)fb_width == mode_info->width &&
            (unsigned int)fb_height == mode_info->height)
        {
          fb_width_mm = output_info->mm_width;
          fb_height_mm = output_info->mm_height;
        }
        else
        {
          dpi = (25.4 * mode_info->height) / output_info->mm_height;
        }
      }
    }

    /*
	 * Compute physical screen size
	 */
    if (fb_width_mm == 0 || fb_height_mm == 0)
    {
      if (fb_width != DisplayWidth(dpy, screen) || fb_height != DisplayHeight(dpy, screen) ||
          dpi != 0.0)
      {
        if (dpi <= 0)
          dpi = (25.4 * DisplayHeight(dpy, screen)) / DisplayHeightMM(dpy, screen);

        fb_width_mm = (25.4 * fb_width) / dpi;
        fb_height_mm = (25.4 * fb_height) / dpi;
      }
      else
      {
        fb_width_mm = DisplayWidthMM(dpy, screen);
        fb_height_mm = DisplayHeightMM(dpy, screen);
      }
    }

    /*
	 * Set panning
	 */
    set_panning();

    /*
	 * Set gamma on crtc's that belong to the outputs.
	 */
    set_gamma();

    /*
	 * Now apply all of the changes
	 */
    apply();

    XSync(dpy, False);
    exit(0);
  }
  if (query_1_2 || (query && has_1_2 && !query_1))
  {
    output_t* output;

#define ModeShown 0x80000000

    get_screen(current);
    get_crtcs();
    get_outputs();

    printf("<screen id=\"%d\" minimum_w=\"%d\" minimum_h=\"%d\" current_w=\"%d\" current_h=\"%d\" "
           "maximum_w=\"%d\" maximum_h=\"%d\">\n",
           screen, minWidth, minHeight, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
           maxWidth, maxHeight);

    for (output = outputs; output; output = output->next)
    {
      XRROutputInfo* output_info = output->output_info;
      crtc_t* crtc = output->crtc_info;
      XRRCrtcInfo* crtc_info = crtc ? crtc->crtc_info : NULL;
      XRRModeInfo* mode = output->mode_info;
      Atom* props;
      int j, k, nprop;
      Bool* mode_shown;
      //	    Rotation	    rotations = output_rotations (output);

      printf("  <output name=\"%s\" connected=\"%s\"", output_info->name,
             connection[output_info->connection]);
      if (mode)
      {
        if (crtc_info)
        {
          printf(" w=\"%d\" h=\"%d\" x=\"%d\" y=\"%d\" crtc=\"%d\"", crtc_info->width,
                 crtc_info->height, crtc_info->x, crtc_info->y, crtc->crtc.index);
        }
        else
        {
          printf(" w=\"%d\" h=\"%d\" x=\"%d\" y=\"%d\"", mode->width, mode->height, output->x,
                 output->y);
        }
        if (verbose)
          printf(" id=\"%lx\"", mode->id);
        if (output->rotation != RR_Rotate_0 || verbose)
        {
          printf(" rotation=\"%s\"", rotation_name(output->rotation));
          if (output->rotation & (RR_Reflect_X | RR_Reflect_Y))
            printf(" reflection=\"%s\"", reflection_name(output->rotation));
        }
      }
      /*
	    if (rotations != RR_Rotate_0 || verbose)
	    {
		Bool    first = True;
		printf (" (");
		for (i = 0; i < 4; i ++) {
		    if ((rotations >> i) & 1) {
			if (!first) printf (" "); first = False;
			printf("%s", direction[i]);
		    }
		}
		if (rotations & RR_Reflect_X)
		{
		    if (!first) printf (" "); first = False;
		    printf ("x axis");
		}
		if (rotations & RR_Reflect_Y)
		{
		    if (!first) printf (" ");
		    printf ("y axis");
		}
		printf (")");
	    }
*/

      if (mode)
      {
        printf(" wmm=\"%d\" hmm=\"%d\"", (int)output_info->mm_width, (int)output_info->mm_height);
      }

      if (crtc && crtc->panning_info && crtc->panning_info->width > 0)
      {
        XRRPanning* pan = crtc->panning_info;
        printf(" panning %dx%d+%d+%d", pan->width, pan->height, pan->left, pan->top);
        if ((pan->track_width != 0 &&
             (pan->track_left != pan->left || pan->track_width != pan->width ||
              pan->border_left != 0 || pan->border_right != 0)) ||
            (pan->track_height != 0 &&
             (pan->track_top != pan->top || pan->track_height != pan->height ||
              pan->border_top != 0 || pan->border_bottom != 0)))
          printf(" tracking %dx%d+%d+%d border %d/%d/%d/%d", pan->track_width, pan->track_height,
                 pan->track_left, pan->track_top, pan->border_left, pan->border_top,
                 pan->border_right, pan->border_bottom);
      }
      printf(">\n");

      if (verbose)
      {
        printf("\tIdentifier: 0x%x\n", (int)output->output.xid);
        printf("\tTimestamp:  %d\n", (int)output_info->timestamp);
        printf("\tSubpixel:   %s\n", order[output_info->subpixel_order]);
        if (output->gamma.red != 0.0f && output->gamma.green != 0.0f && output->gamma.blue != 0.0f)
        {
          printf("\tGamma:      %#.2g:%#.2g:%#.2g\n", (double)output->gamma.red,
                 (double)output->gamma.green, (double)output->gamma.blue);
          printf("\tBrightness: %#.2g\n", (double)output->brightness);
        }
        printf("\tClones:    ");
        for (j = 0; j < output_info->nclone; j++)
        {
          output_t* clone = find_output_by_xid(output_info->clones[j]);

          if (clone)
            printf(" %s", clone->output.string);
        }
        printf("\n");
        if (output->crtc_info)
          printf("\tCRTC:       %d\n", output->crtc_info->crtc.index);
        printf("\tCRTCs:     ");
        for (j = 0; j < output_info->ncrtc; j++)
        {
          crtc_t* crtc = find_crtc_by_xid(output_info->crtcs[j]);
          if (crtc)
            printf(" %d", crtc->crtc.index);
        }
        printf("\n");
        if (output->crtc_info && output->crtc_info->panning_info)
        {
          XRRPanning* pan = output->crtc_info->panning_info;
          printf("\tPanning:    %dx%d+%d+%d\n", pan->width, pan->height, pan->left, pan->top);
          printf("\tTracking:   %dx%d+%d+%d\n", pan->track_width, pan->track_height,
                 pan->track_left, pan->track_top);
          printf("\tBorder:     %d/%d/%d/%d\n", pan->border_left, pan->border_top,
                 pan->border_right, pan->border_bottom);
        }
      }
      if (verbose)
      {
        int x, y;

        printf("\tTransform: ");
        for (y = 0; y < 3; y++)
        {
          for (x = 0; x < 3; x++)
            printf(" %f", XFixedToDouble(output->transform.transform.matrix[y][x]));
          if (y < 2)
            printf("\n\t           ");
        }
        if (output->transform.filter)
          printf("\n\t           filter: %s", output->transform.filter);
        printf("\n");
      }
      if (verbose || properties)
      {
        props = XRRListOutputProperties(dpy, output->output.xid, &nprop);
        for (j = 0; j < nprop; j++)
        {
          unsigned char* prop;
          int actual_format;
          unsigned long nitems, bytes_after;
          Atom actual_type;
          XRRPropertyInfo* propinfo;

          XRRGetOutputProperty(dpy, output->output.xid, props[j], 0, 100, False, False,
                               AnyPropertyType, &actual_type, &actual_format, &nitems, &bytes_after,
                               &prop);

          propinfo = XRRQueryOutputProperty(dpy, output->output.xid, props[j]);

          if (actual_type == XA_INTEGER && actual_format == 8)
          {
            int k;

            printf("\t%s:\n", XGetAtomName(dpy, props[j]));
            for (k = 0; k < (long)nitems; k++)
            {
              if (k % 16 == 0)
                printf("\t\t");
              printf("%02x", (unsigned char)prop[k]);
              if (k % 16 == 15)
                printf("\n");
            }
          }
          else if (actual_type == XA_INTEGER && actual_format == 32)
          {
            printf("\t%s: ", XGetAtomName(dpy, props[j]));
            for (k = 0; k < (long)nitems; k++)
            {
              if (k > 0)
                printf("\n\t\t\t");
              printf("%d (0x%08x)", (int)((INT32*)prop)[k], (int)((INT32*)prop)[k]);
            }

            if (propinfo->range && propinfo->num_values > 0)
            {
              if (nitems > 1)
                printf("\n\t\t");
              printf("\trange%s: ", (propinfo->num_values == 2) ? "" : "s");

              for (k = 0; k < propinfo->num_values / 2; k++)
                printf(" (%d,%d)", (int)propinfo->values[k * 2], (int)propinfo->values[k * 2 + 1]);
            }

            printf("\n");
          }
          else if (actual_type == XA_ATOM && actual_format == 32)
          {
            printf("\t%s:", XGetAtomName(dpy, props[j]));
            for (k = 0; k < (long)nitems; k++)
            {
              if (k > 0 && (k & 1) == 0)
                printf("\n\t\t");
              printf("\t%s", XGetAtomName(dpy, ((Atom*)prop)[k]));
            }

            if (!propinfo->range && propinfo->num_values > 0)
            {
              printf("\n\t\tsupported:");

              for (k = 0; k < propinfo->num_values; k++)
              {
                printf(" %-12.12s", XGetAtomName(dpy, propinfo->values[k]));
                if (k % 4 == 3 && k < propinfo->num_values - 1)
                  printf("\n\t\t          ");
              }
            }
            printf("\n");
          }
          else if (actual_format == 8)
          {
            printf("\t%s: %s%s\n", XGetAtomName(dpy, props[j]), prop, bytes_after ? "..." : "");
          }
          else
          {
            char* type = actual_type ? XGetAtomName(dpy, actual_type) : "none";
            printf("\t%s: %s(%d) (format %d items %d) ????\n", XGetAtomName(dpy, props[j]), type,
                   (int)actual_type, actual_format, (int)nitems);
          }

          free(propinfo);
        }
      }

      if (verbose)
      {
        for (j = 0; j < output_info->nmode; j++)
        {
          XRRModeInfo* mode = find_mode_by_xid(output_info->modes[j]);
          int f;

          printf("  %s (0x%x) %6.1fMHz", mode->name, (int)mode->id,
                 (double)mode->dotClock / 1000000.0);
          for (f = 0; mode_flags[f].flag; f++)
            if (mode->modeFlags & mode_flags[f].flag)
              printf(" %s", mode_flags[f].string);
          if (mode == output->mode_info)
            printf(" *current");
          if (j < output_info->npreferred)
            printf(" +preferred");
          printf("\n");
          printf("        h: width  %4d start %4d end %4d total %4d skew %4d clock %6.1fKHz\n",
                 mode->width, mode->hSyncStart, mode->hSyncEnd, mode->hTotal, mode->hSkew,
                 mode_hsync(mode) / 1000);
          printf("        v: height %4d start %4d end %4d total %4d           clock %6.1fHz\n",
                 mode->height, mode->vSyncStart, mode->vSyncEnd, mode->vTotal, mode_refresh(mode));
          mode->modeFlags |= ModeShown;
        }
      }
      else
      {
        mode_shown = calloc(output_info->nmode, sizeof(Bool));
        if (!mode_shown)
          fatal("out of memory\n");
        for (j = 0; j < output_info->nmode; j++)
        {
          XRRModeInfo *jmode, *kmode;

          if (mode_shown[j])
            continue;

          jmode = find_mode_by_xid(output_info->modes[j]);
          for (k = j; k < output_info->nmode; k++)
          {
            if (mode_shown[k])
              continue;
            kmode = find_mode_by_xid(output_info->modes[k]);
            if (strcmp(jmode->name, kmode->name) != 0)
              continue;
            mode_shown[k] = True;
            kmode->modeFlags |= ModeShown;
            printf("    <mode id=\"0x%lx\" name=\"%s\" w=\"%d\" h=\"%d\" hz=\"%.5f\"", kmode->id,
                   kmode->name, kmode->width, kmode->height, mode_refresh(kmode));
            if (kmode == output->mode_info)
              printf(" current=\"true\"");
            else
              printf(" current=\"false\"");
            if (k < output_info->npreferred)
              printf(" preferred=\"true\"");
            else
              printf(" preferred=\"false\"");
            printf("/>\n");
          }
        }
        free(mode_shown);
      }
      printf("  </output>\n");
    }

    /*
	for (m = 0; m < res->nmode; m++)
	{
	    XRRModeInfo	*mode = &res->modes[m];

	    if (!(mode->modeFlags & ModeShown))
	    {
		printf ("  %s (0x%x) %6.1fMHz\n",
			mode->name, (int)mode->id,
			(double)mode->dotClock / 1000000.0);
		printf ("        h: width  %4d start %4d end %4d total %4d skew %4d clock %6.1fKHz\n",
			mode->width, mode->hSyncStart, mode->hSyncEnd,
			mode->hTotal, mode->hSkew, mode_hsync (mode) / 1000);
		printf ("        v: height %4d start %4d end %4d total %4d           clock %6.1fHz\n",
			mode->height, mode->vSyncStart, mode->vSyncEnd, mode->vTotal,
			mode_refresh (mode));
	    }
	}
*/
    printf("</screen>\n");
    exit(0);
  }

  sc = XRRGetScreenInfo(dpy, root);

  if (sc == NULL)
    exit(1);

  current_size = XRRConfigCurrentConfiguration(sc, &current_rotation);

  sizes = XRRConfigSizes(sc, &nsize);

  if (have_pixel_size)
  {
    for (size = 0; size < nsize; size++)
    {
      if (sizes[size].width == width && sizes[size].height == height)
        break;
    }
    if (size >= nsize)
    {
      fprintf(stderr, "Size %dx%d not found in available modes\n", width, height);
      exit(1);
    }
  }
  else if (size < 0)
    size = current_size;
  else if (size >= nsize)
  {
    fprintf(stderr, "Size index %d is too large, there are only %d sizes\n", size, nsize);
    exit(1);
  }

  if (rot < 0)
  {
    for (rot = 0; rot < 4; rot++)
      if (1 << rot == (current_rotation & 0xf))
        break;
  }

  current_rate = XRRConfigCurrentRate(sc);

  if (rate < 0)
  {
    if (size == current_size)
      rate = current_rate;
    else
      rate = 0;
  }
  else
  {
    rates = XRRConfigRates(sc, size, &nrate);
    for (i = 0; i < nrate; i++)
      if (rate == rates[i])
        break;
    if (i == nrate)
    {
      fprintf(stderr, "Rate %.1f Hz not available for this size\n", rate);
      exit(1);
    }
  }

  if (version)
  {
    int major_version, minor_version;
    XRRQueryVersion(dpy, &major_version, &minor_version);
    printf("Server reports RandR version %d.%d\n", major_version, minor_version);
  }

  if (query || query_1)
  {
    printf(" SZ:    Pixels          Physical       Refresh\n");
    for (i = 0; i < nsize; i++)
    {
      printf("%c%-2d %5d x %-5d  (%4dmm x%4dmm )", i == current_size ? '*' : ' ', i, sizes[i].width,
             sizes[i].height, sizes[i].mwidth, sizes[i].mheight);
      rates = XRRConfigRates(sc, i, &nrate);
      if (nrate)
        printf("  ");
      for (j = 0; j < nrate; j++)
        printf("%c%-4d", i == current_size && rates[j] == current_rate ? '*' : ' ', rates[j]);
      printf("\n");
    }
  }

  rotations = XRRConfigRotations(sc, &current_rotation);

  rotation = 1 << rot;
  if (query)
  {
    printf("Current rotation - %s\n", rotation_name(current_rotation));

    printf("Current reflection - %s\n", reflection_name(current_rotation));

    printf("Rotations possible - ");
    for (i = 0; i < 4; i++)
    {
      if ((rotations >> i) & 1)
        printf("%s ", direction[i]);
    }
    printf("\n");

    printf("Reflections possible - ");
    if (rotations & (RR_Reflect_X | RR_Reflect_Y))
    {
      if (rotations & RR_Reflect_X)
        printf("X Axis ");
      if (rotations & RR_Reflect_Y)
        printf("Y Axis");
    }
    else
      printf("none");
    printf("\n");
  }

  if (verbose)
  {
    printf("Setting size to %d, rotation to %s\n", size, direction[rot]);

    printf("Setting reflection on ");
    if (reflection)
    {
      if (reflection & RR_Reflect_X)
        printf("X Axis ");
      if (reflection & RR_Reflect_Y)
        printf("Y Axis");
    }
    else
      printf("neither axis");
    printf("\n");

    if (reflection & RR_Reflect_X)
      printf("Setting reflection on X axis\n");

    if (reflection & RR_Reflect_Y)
      printf("Setting reflection on Y axis\n");
  }

  /* we should test configureNotify on the root window */
  XSelectInput(dpy, root, StructureNotifyMask);

  if (setit && !dryrun)
    XRRSelectInput(dpy, root, RRScreenChangeNotifyMask);
  if (setit && !dryrun)
    status = XRRSetScreenConfigAndRate(dpy, sc, root, (SizeID)size,
                                       (Rotation)(rotation | reflection), rate, CurrentTime);

  if (setit && !dryrun && status == RRSetConfigFailed)
  {
    printf("Failed to change the screen configuration!\n");
    ret = 1;
  }

  if (verbose && setit && !dryrun && size != current_size)
  {
    if (status == RRSetConfigSuccess)
    {
      Bool seen_screen = False;
      while (!seen_screen)
      {
        int spo;
        XNextEvent(dpy, (XEvent*)&event);

        printf("Event received, type = %d\n", event.type);
        /* update Xlib's knowledge of the event */
        XRRUpdateConfiguration((XEvent*)&event);
        if (event.type == ConfigureNotify)
          printf("Received ConfigureNotify Event!\n");

        switch (event.type - event_base)
        {
          case RRScreenChangeNotify:
            sce = (XRRScreenChangeNotifyEvent*)&event;

            printf("Got a screen change notify event!\n");
            printf(" window = %d\n root = %d\n size_index = %d\n rotation %d\n", (int)sce->window,
                   (int)sce->root, sce->size_index, sce->rotation);
            printf(" timestamp = %ld, config_timestamp = %ld\n", sce->timestamp,
                   sce->config_timestamp);
            printf(" Rotation = %x\n", sce->rotation);
            printf(" %d X %d pixels, %d X %d mm\n", sce->width, sce->height, sce->mwidth,
                   sce->mheight);
            printf("Display width   %d, height   %d\n", DisplayWidth(dpy, screen),
                   DisplayHeight(dpy, screen));
            printf("Display widthmm %d, heightmm %d\n", DisplayWidthMM(dpy, screen),
                   DisplayHeightMM(dpy, screen));
            spo = sce->subpixel_order;
            if ((spo < 0) || (spo > 5))
              printf("Unknown subpixel order, value = %d\n", spo);
            else
              printf("new Subpixel rendering model is %s\n", order[spo]);
            seen_screen = True;
            break;
          default:
            if (event.type != ConfigureNotify)
              printf("unknown event received, type = %d!\n", event.type);
        }
      }
    }
  }
  XRRFreeScreenConfigInfo(sc);
  return (ret);
}