GUI-FreeRDP/freerdp/client/X11/cli/rxrandr.c

#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <X11/Xproto.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xrandr.h>
#include <X11/extensions/Xrender.h>
#include <strings.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <stdarg.h>
#include <math.h>

#include <unistd.h>

#include "rxrandr.h"

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

static const char *filter_names[2] =
{ "bilinear", "nearest" };

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

static void _X_NORETURN _X_ATTRIBUTE_PRINTF(1, 2) 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);
}

static void _X_ATTRIBUTE_PRINTF(1, 2) warning(const char *format, ...)
{
    va_list ap;

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

static void _X_NORETURN _X_ATTRIBUTE_PRINTF(1, 2) argerr(const char *format, ...)
{
    va_list ap;

    va_start(ap, format);
    fprintf(stderr, "%s: ", program_name);
    vfprintf(stderr, format, ap);
    fprintf(stderr, "Try '%s --help' for more information.\n", program_name);
    va_end(ap);
    exit(1);
}

static inline double dmin(double x, double y)
{
    return x < y ? x : y;
}

static const 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 const 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_filter = (1 << 13),
} 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;
typedef struct _provider provider_t;
typedef struct _monitors monitors_t;
typedef struct _umonitor umonitor_t;

struct _transform
{
    XTransform transform;
    const 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;
};

struct _provider
{
    name_t provider;
    XRRProviderInfo *info;
};

struct _monitors
{
    int n;
    XRRMonitorInfo *monitors;
};

struct _umonitor
{
    struct _umonitor *next;
    char *name;
    Bool set;
    Bool primary;
    int x, y, width, height;
    int mmwidth, mmheight;
    int noutput;
    name_t *outputs;
};

#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 *all_outputs = NULL;
static output_t **all_outputs_tail = &all_outputs;
static crtc_t *crtcs;
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 Bool dryrun = False;
static int minWidth, maxWidth, minHeight, maxHeight;
static Bool has_1_2 = False;
static Bool has_1_3 = False;
static Bool has_1_4 = False;
static Bool has_1_5 = False;
static monitors_t *monitors;

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);
}

static double mode_refresh(const XRRModeInfo *mode_info)
{
    double rate;
    double vTotal = mode_info->vTotal;

    if (mode_info->modeFlags & RR_DoubleScan)
    {
        vTotal *= 2;
    }

    if (mode_info->modeFlags & RR_Interlace)
    {
        vTotal /= 2;
    }

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

static void init_name(name_t *name)
{
    memset(name, 0, sizeof(*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 idx)
{
    name->kind |= name_index;
    name->index = idx;
}

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;
    int idx;

    if ((valid & name_xid) && sscanf(string, "0x%x", &xid) == 1)
        set_name_xid(name, xid);
    else if ((valid & name_index) && sscanf(string, "%d", &idx) == 1)
        set_name_index(name, idx);
    else if (valid & name_string)
        set_name_string(name, string);
    else
        argerr("invalid name '%s'\n", string);
}

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, const char *filter, XFixed *params, int nparams)
{
    dest->transform = *transform;
    dest->filter = strdup(filter);
    dest->nparams = nparams;
    dest->params = malloc(nparams * sizeof(XFixed));
    memcpy(dest->params, params, nparams * sizeof(XFixed));
}

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;
    *all_outputs_tail = output;
    all_outputs_tail = &output->next;
    return output;
}

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

    for (output = all_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);
}

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;

            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;
}

static Bool output_can_use_rotation(output_t *output, Rotation rotation)
{
    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 && !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;
}

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 *crtc_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;
    }

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

    last_red = find_last_non_clamped(crtc_gamma->red, size);
    last_green = find_last_non_clamped(crtc_gamma->green, size);
    last_blue = find_last_non_clamped(crtc_gamma->blue, size);
    best_array = crtc_gamma->red;
    last_best = last_red;
    if (last_green > last_best)
    {
        last_best = last_green;
        best_array = crtc_gamma->green;
    }
    if (last_blue > last_best)
    {
        last_best = last_blue;
        best_array = crtc_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)
    {
        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 = log((double) (crtc_gamma->red[last_red / 2]) / output->brightness / 65535) / log((double) ((last_red / 2) + 1) / size);
        output->gamma.green = log((double) (crtc_gamma->green[last_green / 2]) / output->brightness / 65535)
                / log((double) ((last_green / 2) + 1) / size);
        output->gamma.blue = log((double) (crtc_gamma->blue[last_blue / 2]) / output->brightness / 65535)
                / log((double) ((last_blue / 2) + 1) / size);
    }

    XRRFreeGamma(crtc_gamma);
}

static void set_output_info(output_t *output, RROutput xid, XRROutputInfo *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);

    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;

    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%lx\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%lx\n", output->output.string, output->crtc_info->crtc.xid);
    }

    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%lx 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%lx\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);
    }

    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;
        }
    }

    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));

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

    if (!(output->changes & changes_transform))
    {
        if (output->crtc_info)
            copy_transform(&output->transform, &output->crtc_info->current_transform);
        else
            init_transform(&output->transform);
    }
    else
    {
        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;
        }
    }
    if (output->changes & changes_filter)
    {
        output->transform.filter = filter_names[filter_type];
    }

    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");

    if (res)
        return;

    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%lx 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 = all_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 = all_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 = all_outputs; output; output = output->next)
    {
        int i, size;
        crtc_t *crtc;
        XRRCrtcGamma *crtc_gamma;
        float gammaRed;
        float gammaGreen;
        float gammaBlue;

        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;
        }

        if (size > 65536)
        {
            fatal("Gamma correction table is impossibly large.\n");
            continue;
        }

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

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

        gammaRed = 1.0 / output->gamma.red;
        gammaGreen = 1.0 / output->gamma.green;
        gammaBlue = 1.0 / output->gamma.blue;

        for (i = 0; i < size; i++)
        {
            if (gammaRed == 1.0 && output->brightness == 1.0)
                crtc_gamma->red[i] = (double) i / (double) (size - 1) * 65535.0;
            else
                crtc_gamma->red[i] = dmin(pow((double) i / (double) (size - 1), gammaRed) * output->brightness, 1.0) * 65535.0;

            if (gammaGreen == 1.0 && output->brightness == 1.0)
                crtc_gamma->green[i] = (double) i / (double) (size - 1) * 65535.0;
            else
                crtc_gamma->green[i] = dmin(pow((double) i / (double) (size - 1), gammaGreen) * output->brightness, 1.0) * 65535.0;

            if (gammaBlue == 1.0 && output->brightness == 1.0)
                crtc_gamma->blue[i] = (double) i / (double) (size - 1) * 65535.0;
            else
                crtc_gamma->blue[i] = dmin(pow((double) i / (double) (size - 1), gammaBlue) * output->brightness, 1.0) * 65535.0;
        }

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

        free(crtc_gamma);
    }
}

static void set_primary(void)
{
    output_t *output;

    if (no_primary)
    {
        XRRSetOutputPrimary(dpy, root, None);
    }
    else
    {
        for (output = all_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 %6.2f +%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;

    for (c = 0; c < res->ncrtc; c++)
        crtc_disable(&crtcs[c]);
    screen_revert();
    for (c = 0; c < res->ncrtc; c++)
        crtc_revert(&crtcs[c]);
}

static void _X_NORETURN panic(Status s, crtc_t *crtc)
{
    int c = crtc->crtc.index;
    const 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;

    if (grab_server)
        XGrabServer(dpy);

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

        if (crtc_info->mode == None)
            continue;

        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);

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

    screen_apply();

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

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

    set_primary();

    if (grab_server)
        XUngrabServer(dpy);
}

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%lx 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);

            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;

        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 = all_outputs; q; q = q->next)
    {
        if (!q->found)
        {
            fprintf(stderr, "warning: output %s not found; ignoring\n", q->output.string);
        }
    }
}

static void get_monitors(Bool get_active)
{
    XRRMonitorInfo *m;
    int n;

    if (!has_1_5 || monitors)
        return;

    m = XRRGetMonitors(dpy, root, get_active, &n);
    if (n == -1)
        fatal("get monitors failed\n");
    monitors = calloc(1, sizeof(monitors_t));
    monitors->n = n;
    monitors->monitors = m;
}

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;

        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%lx\n", crtc->crtc_info->outputs[o]);
            if (output->changes)
                crtc->changing = True;
        }

        for (o = 0; o < crtc->noutput; o++)
        {
            output = crtc->outputs[o];
            if (output->changes)
                crtc->changing = True;
        }
    }
}

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 = all_outputs; other; other = other->next)
    {
        if (other == output)
            continue;

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

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

        for (l = 0; l < output->output_info->nclone; l++)
            if (output->output_info->clones[l] == other->output.xid)
                break;
        if (l == output->output_info->nclone)
            return False;
    }

    if (crtc->noutput)
    {
        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)
    {
        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%lx\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 = all_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;
            }

            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");
    }

    min_x = 32768;
    min_y = 32768;
    for (output = all_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)
    {
        for (output = all_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 = all_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;

        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);
        }

        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 > fb_width)
                fb_width = pan->left + pan->width;
            if (pan && pan->top + pan->height > 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;
    }
}

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;

    output->crtc_info = NULL;
    best_score = pick_crtcs_score(outputs);
    if (output->mode_info == NULL)
        return best_score;

    best_crtc = NULL;

    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%lx\n", output->output_info->crtcs[c]);

        disable_outputs(outputs);
        if (!check_crtc_for_output(crtc, output))
            continue;

        my_score = 1000;

        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;

    (void) pick_crtcs_score(outputs);

    return best_score;
}

static void pick_crtcs(void)
{
    output_t *output;
    int saved_crtc_noutput[num_crtcs];
    int n;

    for (output = all_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;
            }
        }
    }

    if (!output)
        return;

    for (output = all_outputs; output; output = output->next)
        output->current_crtc_info = output->crtc_info;

    for (n = 0; n < num_crtcs; n++)
    {
        saved_crtc_noutput[n] = crtcs[n].crtc_info->noutput;
        crtcs[n].crtc_info->noutput = 0;
    }

    pick_crtcs_score(all_outputs);

    for (n = 0; n < num_crtcs; n++)
        crtcs[n].crtc_info->noutput = saved_crtc_noutput[n];

    for (output = all_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;
    }
}

void set_default_global()
{
    fb_width_mm = 0;
    fb_height_mm = 0;
    all_outputs = NULL;
    all_outputs_tail = &all_outputs;
    crtcs = NULL;
    num_crtcs = 0;
    res = NULL;
    fb_width = 0, fb_height = 0;
    fb_width_mm = 0, fb_height_mm = 0;
    dpi = 0;
    dryrun = False;
    has_1_2 = False;
    has_1_3 = False;
    has_1_4 = False;
    has_1_5 = False;
    program_name = NULL;
    dpy = NULL;
    screen = -1;
    verbose = False;
    automatic = False;
    grab_server = True;
    no_primary = False;
    filter_type = -1;
    monitors = NULL;
}

typedef struct
{
    char *first_monitor;
    char *second_monitor;
    int is_position;
    relation_t position;
    int primary;
} x_change;

int XChange(x_change *settings)
{
    if (!settings->first_monitor)
        return 1;

    setenv("DISPLAY", ":0.0", 0);

    char *display_name = NULL;
    int event_base, error_base;
    output_t *config_output = NULL;
    int major, minor;

    config_output = find_output_by_name(settings->first_monitor);
    if (!config_output)
    {
        config_output = add_output();
        set_name(&config_output->output, settings->first_monitor, name_string | name_xid);
    }

    if (settings->primary)
    {
        config_output->changes |= changes_primary;
        config_output->primary = True;
    }

    if (settings->is_position && settings->second_monitor)
    {
        config_output->relation = settings->position;
        config_output->relative_to = settings->second_monitor;
        config_output->changes |= changes_relation;
    }

    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 (major > 1 || (major == 1 && minor >= 4))
        has_1_4 = True;
    if (major > 1 || (major == 1 && minor >= 5))
        has_1_5 = True;

    get_screen(True);
    get_crtcs();
    get_outputs();
    set_positions();
    set_screen_size();

    pick_crtcs();
    set_crtcs();
    mark_changing_crtcs();

    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_gamma();
    apply();

    XSync(dpy, False);
    XCloseDisplay(dpy);

    set_default_global();

    return 0;
}

int XInfo(x_info *info)
{
    setenv("DISPLAY", ":0.0", 0);

    char *display_name = NULL;
    int event_base, error_base;
    int major, minor;

    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 (major > 1 || (major == 1 && minor >= 4))
        has_1_4 = True;
    if (major > 1 || (major == 1 && minor >= 5))
        has_1_5 = True;

    if (!has_1_5)
    {
        printf("RandR 1.5 not supported\n");
        exit(0);
    }

    get_screen(False);
    get_monitors(False);
    get_crtcs();
    get_outputs();

    if (monitors)
    {
        info->count = monitors->n;

        for (int m = 0; m < monitors->n; m++)
        {
            strcpy(info->monitor[m].name, XGetAtomName(dpy, monitors->monitors[m].name));
            info->monitor[m].primary = monitors->monitors[m].primary ? 1 : 0;
            info->monitor[m].width = monitors->monitors[m].width;
            info->monitor[m].height = monitors->monitors[m].height;
        }

        XCloseDisplay(dpy);

        free(monitors);
        set_default_global();

        return 0;
    }

    XCloseDisplay(dpy);
    set_default_global();

    return 1;
}