/*
 * Copyright © 2006 Keith Packard
 * Copyright © 2008 Red Hat, Inc.
 *
 * 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.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <stddef.h>
#include <string.h>
#include <stdio.h>

#include "xf86.h"
#include "xf86DDC.h"
#include "xf86Crtc.h"
#include "xf86Modes.h"
#include "xf86Priv.h"
#include "xf86RandR12.h"
#include "X11/extensions/render.h"
#include "X11/extensions/dpmsconst.h"
#include "X11/Xatom.h"
#include "picturestr.h"

#ifdef XV
#include "xf86xv.h"
#endif

#define NO_OUTPUT_DEFAULT_WIDTH 1024
#define NO_OUTPUT_DEFAULT_HEIGHT 768
/*
 * Initialize xf86CrtcConfig structure
 */

int xf86CrtcConfigPrivateIndex = -1;

void
xf86CrtcConfigInit(ScrnInfoPtr scrn, const xf86CrtcConfigFuncsRec * funcs)
{
    xf86CrtcConfigPtr config;

    if (xf86CrtcConfigPrivateIndex == -1)
        xf86CrtcConfigPrivateIndex = xf86AllocateScrnInfoPrivateIndex();
    config = xnfcalloc(1, sizeof(xf86CrtcConfigRec));

    config->funcs = funcs;
    config->compat_output = -1;

    scrn->privates[xf86CrtcConfigPrivateIndex].ptr = config;
}

void
xf86CrtcSetSizeRange(ScrnInfoPtr scrn,
                     int minWidth, int minHeight, int maxWidth, int maxHeight)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);

    config->minWidth = minWidth;
    config->minHeight = minHeight;
    config->maxWidth = maxWidth;
    config->maxHeight = maxHeight;
}

/*
 * Crtc functions
 */
xf86CrtcPtr
xf86CrtcCreate(ScrnInfoPtr scrn, const xf86CrtcFuncsRec * funcs)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    xf86CrtcPtr crtc, *crtcs;

    crtc = calloc(sizeof(xf86CrtcRec), 1);
    if (!crtc)
        return NULL;
    crtc->version = XF86_CRTC_VERSION;
    crtc->scrn = scrn;
    crtc->funcs = funcs;
#ifdef RANDR_12_INTERFACE
    crtc->randr_crtc = NULL;
#endif
    crtc->rotation = RR_Rotate_0;
    crtc->desiredRotation = RR_Rotate_0;
    pixman_transform_init_identity(&crtc->crtc_to_framebuffer);
    pixman_f_transform_init_identity(&crtc->f_crtc_to_framebuffer);
    pixman_f_transform_init_identity(&crtc->f_framebuffer_to_crtc);
    crtc->filter = NULL;
    crtc->params = NULL;
    crtc->nparams = 0;
    crtc->filter_width = 0;
    crtc->filter_height = 0;
    crtc->transform_in_use = FALSE;
    crtc->transformPresent = FALSE;
    crtc->desiredTransformPresent = FALSE;
    memset(&crtc->bounds, '\0', sizeof(crtc->bounds));

    /* Preallocate gamma at a sensible size. */
    crtc->gamma_size = 256;
    crtc->gamma_red = xallocarray(crtc->gamma_size, 3 * sizeof(CARD16));
    if (!crtc->gamma_red) {
        free(crtc);
        return NULL;
    }
    crtc->gamma_green = crtc->gamma_red + crtc->gamma_size;
    crtc->gamma_blue = crtc->gamma_green + crtc->gamma_size;

    if (xf86_config->crtc)
        crtcs = reallocarray(xf86_config->crtc,
                             xf86_config->num_crtc + 1, sizeof(xf86CrtcPtr));
    else
        crtcs = xallocarray(xf86_config->num_crtc + 1, sizeof(xf86CrtcPtr));
    if (!crtcs) {
        free(crtc->gamma_red);
        free(crtc);
        return NULL;
    }
    xf86_config->crtc = crtcs;
    xf86_config->crtc[xf86_config->num_crtc++] = crtc;
    return crtc;
}

void
xf86CrtcDestroy(xf86CrtcPtr crtc)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(crtc->scrn);
    int c;

    (*crtc->funcs->destroy) (crtc);
    for (c = 0; c < xf86_config->num_crtc; c++)
        if (xf86_config->crtc[c] == crtc) {
            memmove(&xf86_config->crtc[c],
                    &xf86_config->crtc[c + 1],
                    ((xf86_config->num_crtc - (c + 1)) * sizeof(void *)));
            xf86_config->num_crtc--;
            break;
        }
    free(crtc->params);
    free(crtc->gamma_red);
    free(crtc);
}

/**
 * Return whether any outputs are connected to the specified pipe
 */

Bool
xf86CrtcInUse(xf86CrtcPtr crtc)
{
    ScrnInfoPtr pScrn = crtc->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int o;

    for (o = 0; o < xf86_config->num_output; o++)
        if (xf86_config->output[o]->crtc == crtc)
            return TRUE;
    return FALSE;
}

/**
 * Return whether the crtc is leased by a client
 */

static Bool
xf86CrtcIsLeased(xf86CrtcPtr crtc)
{
    /* If the DIX structure hasn't been created, it can't have been leased */
    if (!crtc->randr_crtc)
        return FALSE;
    return RRCrtcIsLeased(crtc->randr_crtc);
}

/**
 * Return whether the output is leased by a client
 */

static Bool
xf86OutputIsLeased(xf86OutputPtr output)
{
    /* If the DIX structure hasn't been created, it can't have been leased */
    if (!output->randr_output)
        return FALSE;
    return RROutputIsLeased(output->randr_output);
}

void
xf86CrtcSetScreenSubpixelOrder(ScreenPtr pScreen)
{
    int subpixel_order = SubPixelUnknown;
    Bool has_none = FALSE;
    ScrnInfoPtr scrn = xf86ScreenToScrn(pScreen);
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int icrtc, o;

    for (icrtc = 0; icrtc < xf86_config->num_crtc; icrtc++) {
        xf86CrtcPtr crtc = xf86_config->crtc[icrtc];

        for (o = 0; o < xf86_config->num_output; o++) {
            xf86OutputPtr output = xf86_config->output[o];

            if (output->crtc == crtc) {
                switch (output->subpixel_order) {
                case SubPixelNone:
                    has_none = TRUE;
                    break;
                case SubPixelUnknown:
                    break;
                default:
                    subpixel_order = output->subpixel_order;
                    break;
                }
            }
            if (subpixel_order != SubPixelUnknown)
                break;
        }
        if (subpixel_order != SubPixelUnknown) {
            static const int circle[4] = {
                SubPixelHorizontalRGB,
                SubPixelVerticalRGB,
                SubPixelHorizontalBGR,
                SubPixelVerticalBGR,
            };
            int rotate;
            int sc;

            for (rotate = 0; rotate < 4; rotate++)
                if (crtc->rotation & (1 << rotate))
                    break;
            for (sc = 0; sc < 4; sc++)
                if (circle[sc] == subpixel_order)
                    break;
            sc = (sc + rotate) & 0x3;
            if ((crtc->rotation & RR_Reflect_X) && !(sc & 1))
                sc ^= 2;
            if ((crtc->rotation & RR_Reflect_Y) && (sc & 1))
                sc ^= 2;
            subpixel_order = circle[sc];
            break;
        }
    }
    if (subpixel_order == SubPixelUnknown && has_none)
        subpixel_order = SubPixelNone;
    PictureSetSubpixelOrder(pScreen, subpixel_order);
}

/**
 * Sets the given video mode on the given crtc
 */
Bool
xf86CrtcSetModeTransform(xf86CrtcPtr crtc, DisplayModePtr mode,
                         Rotation rotation, RRTransformPtr transform, int x,
                         int y)
{
    ScrnInfoPtr scrn = crtc->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int i;
    Bool ret = FALSE;
    Bool didLock = FALSE;
    DisplayModePtr adjusted_mode;
    DisplayModeRec saved_mode;
    int saved_x, saved_y;
    Rotation saved_rotation;
    RRTransformRec saved_transform;
    Bool saved_transform_present;

    crtc->enabled = xf86CrtcInUse(crtc) && !xf86CrtcIsLeased(crtc);

    /* We only hit this if someone explicitly sends a "disabled" modeset. */
    if (!crtc->enabled) {
        /* Check everything for stuff that should be off. */
        xf86DisableUnusedFunctions(scrn);
        return TRUE;
    }

    adjusted_mode = xf86DuplicateMode(mode);

    saved_mode = crtc->mode;
    saved_x = crtc->x;
    saved_y = crtc->y;
    saved_rotation = crtc->rotation;
    if (crtc->transformPresent) {
        RRTransformInit(&saved_transform);
        RRTransformCopy(&saved_transform, &crtc->transform);
    }
    saved_transform_present = crtc->transformPresent;

    /* Update crtc values up front so the driver can rely on them for mode
     * setting.
     */
    crtc->mode = *mode;
    crtc->x = x;
    crtc->y = y;
    crtc->rotation = rotation;
    if (transform) {
        RRTransformCopy(&crtc->transform, transform);
        crtc->transformPresent = TRUE;
    }
    else
        crtc->transformPresent = FALSE;

    if (crtc->funcs->set_mode_major) {
        ret = crtc->funcs->set_mode_major(crtc, mode, rotation, x, y);
        goto done;
    }

    didLock = crtc->funcs->lock(crtc);
    /* Pass our mode to the outputs and the CRTC to give them a chance to
     * adjust it according to limitations or output properties, and also
     * a chance to reject the mode entirely.
     */
    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc != crtc)
            continue;

        if (!output->funcs->mode_fixup(output, mode, adjusted_mode)) {
            goto done;
        }
    }

    if (!crtc->funcs->mode_fixup(crtc, mode, adjusted_mode)) {
        goto done;
    }

    if (!xf86CrtcRotate(crtc))
        goto done;

    /* Prepare the outputs and CRTCs before setting the mode. */
    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc != crtc)
            continue;

        /* Disable the output as the first thing we do. */
        output->funcs->prepare(output);
    }

    crtc->funcs->prepare(crtc);

    /* Set up the DPLL and any output state that needs to adjust or depend
     * on the DPLL.
     */
    crtc->funcs->mode_set(crtc, mode, adjusted_mode, crtc->x, crtc->y);
    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc == crtc)
            output->funcs->mode_set(output, mode, adjusted_mode);
    }

    /* Only upload when needed, to avoid unneeded delays. */
    if (!crtc->active && crtc->funcs->gamma_set)
        crtc->funcs->gamma_set(crtc, crtc->gamma_red, crtc->gamma_green,
                               crtc->gamma_blue, crtc->gamma_size);

    /* Now, enable the clocks, plane, pipe, and outputs that we set up. */
    crtc->funcs->commit(crtc);
    for (i = 0; i < xf86_config->num_output; i++) {
        xf86OutputPtr output = xf86_config->output[i];

        if (output->crtc == crtc)
            output->funcs->commit(output);
    }

    ret = TRUE;

 done:
    if (ret) {
        crtc->active = TRUE;
        if (scrn->pScreen)
            xf86CrtcSetScreenSubpixelOrder(scrn->pScreen);
        if (scrn->ModeSet)
            scrn->ModeSet(scrn);

        /* Make sure the HW cursor is hidden if it's supposed to be, in case
         * it was hidden while the CRTC was disabled
         */
        if (!xf86_config->cursor_on)
            xf86_hide_cursors(scrn);
    }
    else {
        crtc->x = saved_x;
        crtc->y = saved_y;
        crtc->rotation = saved_rotation;
        crtc->mode = saved_mode;
        if (saved_transform_present)
            RRTransformCopy(&crtc->transform, &saved_transform);
        crtc->transformPresent = saved_transform_present;
    }

    free((void *) adjusted_mode->name);
    free(adjusted_mode);

    if (didLock)
        crtc->funcs->unlock(crtc);

    return ret;
}

/**
 * Sets the given video mode on the given crtc, but without providing
 * a transform
 */
Bool
xf86CrtcSetMode(xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotation,
                int x, int y)
{
    return xf86CrtcSetModeTransform(crtc, mode, rotation, NULL, x, y);
}

/**
 * Pans the screen, does not change the mode
 */
void
xf86CrtcSetOrigin(xf86CrtcPtr crtc, int x, int y)
{
    ScrnInfoPtr scrn = crtc->scrn;

    crtc->x = x;
    crtc->y = y;

    if (xf86CrtcIsLeased(crtc))
        return;

    if (crtc->funcs->set_origin) {
        if (!xf86CrtcRotate(crtc))
            return;
        crtc->funcs->set_origin(crtc, x, y);
        if (scrn->ModeSet)
            scrn->ModeSet(scrn);
    }
    else
        xf86CrtcSetMode(crtc, &crtc->mode, crtc->rotation, x, y);
}

/*
 * Output functions
 */

extern XF86ConfigPtr xf86configptr;

typedef enum {
    OPTION_PREFERRED_MODE,
    OPTION_ZOOM_MODES,
    OPTION_POSITION,
    OPTION_BELOW,
    OPTION_RIGHT_OF,
    OPTION_ABOVE,
    OPTION_LEFT_OF,
    OPTION_ENABLE,
    OPTION_DISABLE,
    OPTION_MIN_CLOCK,
    OPTION_MAX_CLOCK,
    OPTION_IGNORE,
    OPTION_ROTATE,
    OPTION_PANNING,
    OPTION_PRIMARY,
    OPTION_DEFAULT_MODES,
} OutputOpts;

static OptionInfoRec xf86OutputOptions[] = {
    {OPTION_PREFERRED_MODE, "PreferredMode", OPTV_STRING, {0}, FALSE},
    {OPTION_ZOOM_MODES, "ZoomModes", OPTV_STRING, {0}, FALSE },
    {OPTION_POSITION, "Position", OPTV_STRING, {0}, FALSE},
    {OPTION_BELOW, "Below", OPTV_STRING, {0}, FALSE},
    {OPTION_RIGHT_OF, "RightOf", OPTV_STRING, {0}, FALSE},
    {OPTION_ABOVE, "Above", OPTV_STRING, {0}, FALSE},
    {OPTION_LEFT_OF, "LeftOf", OPTV_STRING, {0}, FALSE},
    {OPTION_ENABLE, "Enable", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_DISABLE, "Disable", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_MIN_CLOCK, "MinClock", OPTV_FREQ, {0}, FALSE},
    {OPTION_MAX_CLOCK, "MaxClock", OPTV_FREQ, {0}, FALSE},
    {OPTION_IGNORE, "Ignore", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_ROTATE, "Rotate", OPTV_STRING, {0}, FALSE},
    {OPTION_PANNING, "Panning", OPTV_STRING, {0}, FALSE},
    {OPTION_PRIMARY, "Primary", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_DEFAULT_MODES, "DefaultModes", OPTV_BOOLEAN, {0}, FALSE},
    {-1, NULL, OPTV_NONE, {0}, FALSE},
};

enum {
    OPTION_MODEDEBUG,
    OPTION_PREFER_CLONEMODE,
};

static OptionInfoRec xf86DeviceOptions[] = {
    {OPTION_MODEDEBUG, "ModeDebug", OPTV_BOOLEAN, {0}, FALSE},
    {OPTION_PREFER_CLONEMODE, "PreferCloneMode", OPTV_BOOLEAN, {0}, FALSE},
    {-1, NULL, OPTV_NONE, {0}, FALSE},
};

static void
xf86OutputSetMonitor(xf86OutputPtr output)
{
    char *option_name;
    const char *monitor;

    if (!output->name)
        return;

    free(output->options);

    output->options = xnfalloc(sizeof(xf86OutputOptions));
    memcpy(output->options, xf86OutputOptions, sizeof(xf86OutputOptions));

    XNFasprintf(&option_name, "monitor-%s", output->name);
    monitor = xf86findOptionValue(output->scrn->options, option_name);
    if (!monitor)
        monitor = output->name;
    else
        xf86MarkOptionUsedByName(output->scrn->options, option_name);
    free(option_name);
    output->conf_monitor = xf86findMonitor(monitor,
                                           xf86configptr->conf_monitor_lst);
    /*
     * Find the monitor section of the screen and use that
     */
    if (!output->conf_monitor && output->use_screen_monitor)
        output->conf_monitor = xf86findMonitor(output->scrn->monitor->id,
                                               xf86configptr->conf_monitor_lst);
    if (output->conf_monitor) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s using monitor section %s\n",
                   output->name, output->conf_monitor->mon_identifier);
        xf86ProcessOptions(output->scrn->scrnIndex,
                           output->conf_monitor->mon_option_lst,
                           output->options);
    }
    else
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s has no monitor section\n", output->name);
}

static Bool
xf86OutputEnabled(xf86OutputPtr output, Bool strict)
{
    Bool enable, disable;

    /* check to see if this output was enabled in the config file */
    if (xf86GetOptValBool(output->options, OPTION_ENABLE, &enable) && enable) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s enabled by config file\n", output->name);
        return TRUE;
    }
    /* or if this output was disabled in the config file */
    if (xf86GetOptValBool(output->options, OPTION_DISABLE, &disable) && disable) {
        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
                   "Output %s disabled by config file\n", output->name);
        return FALSE;
    }

    /* If not, try to only light up the ones we know are connected which are supposed to be on the desktop */
    if (strict) {
        enable = output->status == XF86OutputStatusConnected && !output->non_desktop;
    }
    /* But if that fails, try to light up even outputs we're unsure of */
    else {
        enable = output->status != XF86OutputStatusDisconnected;
    }

    xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
               "Output %s %sconnected\n", output->name, enable ? "" : "dis");
    return enable;
}

static Bool
xf86OutputIgnored(xf86OutputPtr output)
{
    return xf86ReturnOptValBool(output->options, OPTION_IGNORE, FALSE);
}

static const char *direction[4] = {
    "normal",
    "left",
    "inverted",
    "right"
};

static Rotation
xf86OutputInitialRotation(xf86OutputPtr output)
{
    const char *rotate_name = xf86GetOptValString(output->options,
                                                  OPTION_ROTATE);
    int i;

    if (!rotate_name) {
        if (output->initial_rotation)
            return output->initial_rotation;
        return RR_Rotate_0;
    }

    for (i = 0; i < 4; i++)
        if (xf86nameCompare(direction[i], rotate_name) == 0)
            return 1 << i;
    return RR_Rotate_0;
}

xf86OutputPtr
xf86OutputCreate(ScrnInfoPtr scrn,
                 const xf86OutputFuncsRec * funcs, const char *name)
{
    xf86OutputPtr output, *outputs;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int len;
    Bool primary;

    if (name)
        len = strlen(name) + 1;
    else
        len = 0;

    output = calloc(sizeof(xf86OutputRec) + len, 1);
    if (!output)
        return NULL;
    output->scrn = scrn;
    output->funcs = funcs;
    if (name) {
        output->name = (char *) (output + 1);
        strcpy(output->name, name);
    }
    output->subpixel_order = SubPixelUnknown;
    /*
     * Use the old per-screen monitor section for the first output
     */
    output->use_screen_monitor = (xf86_config->num_output == 0);
#ifdef RANDR_12_INTERFACE
    output->randr_output = NULL;
#endif
    if (name) {
        xf86OutputSetMonitor(output);
        if (xf86OutputIgnored(output)) {
            free(output);
            return FALSE;
        }
    }

    if (xf86_config->output)
        outputs = reallocarray(xf86_config->output,
                               xf86_config->num_output + 1,
                               sizeof(xf86OutputPtr));
    else
        outputs = xallocarray(xf86_config->num_output + 1,
                              sizeof(xf86OutputPtr));
    if (!outputs) {
        free(output);
        return NULL;
    }

    xf86_config->output = outputs;

    if (xf86GetOptValBool(output->options, OPTION_PRIMARY, &primary) && primary) {
        memmove(xf86_config->output + 1, xf86_config->output,
                xf86_config->num_output * sizeof(xf86OutputPtr));
        xf86_config->output[0] = output;
    }
    else {
        xf86_config->output[xf86_config->num_output] = output;
    }

    xf86_config->num_output++;

    return output;
}

Bool
xf86OutputRename(xf86OutputPtr output, const char *name)
{
    char *newname = strdup(name);

    if (!newname)
        return FALSE;           /* so sorry... */

    if (output->name && output->name != (char *) (output + 1))
        free(output->name);
    output->name = newname;
    xf86OutputSetMonitor(output);
    if (xf86OutputIgnored(output))
        return FALSE;
    return TRUE;
}

void
xf86OutputUseScreenMonitor(xf86OutputPtr output, Bool use_screen_monitor)
{
    if (use_screen_monitor != output->use_screen_monitor) {
        output->use_screen_monitor = use_screen_monitor;
        xf86OutputSetMonitor(output);
    }
}

void
xf86OutputDestroy(xf86OutputPtr output)
{
    ScrnInfoPtr scrn = output->scrn;
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;

    (*output->funcs->destroy) (output);
    while (output->probed_modes)
        xf86DeleteMode(&output->probed_modes, output->probed_modes);
    for (o = 0; o < xf86_config->num_output; o++)
        if (xf86_config->output[o] == output) {
            memmove(&xf86_config->output[o],
                    &xf86_config->output[o + 1],
                    ((xf86_config->num_output - (o + 1)) * sizeof(void *)));
            xf86_config->num_output--;
            break;
        }
    if (output->name && output->name != (char *) (output + 1))
        free(output->name);
    free(output);
}

/*
 * Called during CreateScreenResources to hook up RandR
 */
static Bool
xf86CrtcCreateScreenResources(ScreenPtr screen)
{
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);

    screen->CreateScreenResources = config->CreateScreenResources;

    if (!(*screen->CreateScreenResources) (screen))
        return FALSE;

    if (!xf86RandR12CreateScreenResources(screen))
        return FALSE;

    return TRUE;
}

/*
 * Clean up config on server reset
 */
static Bool
xf86CrtcCloseScreen(ScreenPtr screen)
{
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o, c;

    /* The randr_output and randr_crtc pointers are already invalid as
     * the DIX resources were freed when the associated resources were
     * freed. Clear them now; referencing through them during the rest
     * of the CloseScreen sequence will not end well.
     */
    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];

        output->randr_output = NULL;
    }
    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];

        crtc->randr_crtc = NULL;
    }

    screen->CloseScreen = config->CloseScreen;

    xf86RotateCloseScreen(screen);

    xf86RandR12CloseScreen(screen);

    screen->CloseScreen(screen);

    /* detach any providers */
    if (config->randr_provider) {
        RRProviderDestroy(config->randr_provider);
        config->randr_provider = NULL;
    }
    return TRUE;
}

/*
 * Called at ScreenInit time to set up
 */
#ifdef RANDR_13_INTERFACE
int
#else
Bool
#endif
xf86CrtcScreenInit(ScreenPtr screen)
{
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int c;

    /* Rotation */
    xf86RandR12Init(screen);

    /* support all rotations if every crtc has the shadow alloc funcs */
    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];

        if (!crtc->funcs->shadow_allocate || !crtc->funcs->shadow_create)
            break;
    }
    if (c == config->num_crtc) {
        xf86RandR12SetRotations(screen, RR_Rotate_0 | RR_Rotate_90 |
                                RR_Rotate_180 | RR_Rotate_270 |
                                RR_Reflect_X | RR_Reflect_Y);
        xf86RandR12SetTransformSupport(screen, TRUE);
    }
    else {
        xf86RandR12SetRotations(screen, RR_Rotate_0);
        xf86RandR12SetTransformSupport(screen, FALSE);
    }

    /* Wrap CreateScreenResources so we can initialize the RandR code */
    config->CreateScreenResources = screen->CreateScreenResources;
    screen->CreateScreenResources = xf86CrtcCreateScreenResources;

    config->CloseScreen = screen->CloseScreen;
    screen->CloseScreen = xf86CrtcCloseScreen;

    /* This might still be marked wrapped from a previous generation */
    config->BlockHandler = NULL;

#ifdef XFreeXDGA
    _xf86_di_dga_init_internal(screen);
#endif
#ifdef RANDR_13_INTERFACE
    return RANDR_INTERFACE_VERSION;
#else
    return TRUE;
#endif
}

static DisplayModePtr
xf86DefaultMode(xf86OutputPtr output, int width, int height)
{
    DisplayModePtr target_mode = NULL;
    DisplayModePtr mode;
    int target_diff = 0;
    int target_preferred = 0;
    int mm_height;

    mm_height = output->mm_height;
    if (!mm_height)
        mm_height = (768 * 25.4) / DEFAULT_DPI;
    /*
     * Pick a mode closest to DEFAULT_DPI
     */
    for (mode = output->probed_modes; mode; mode = mode->next) {
        int dpi;
        int preferred = (((mode->type & M_T_PREFERRED) != 0) +
                         ((mode->type & M_T_USERPREF) != 0));
        int diff;

        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;

        /* yes, use VDisplay here, not xf86ModeHeight */
        dpi = (mode->VDisplay * 254) / (mm_height * 10);
        diff = dpi - DEFAULT_DPI;
        diff = diff < 0 ? -diff : diff;
        if (target_mode == NULL || (preferred > target_preferred) ||
            (preferred == target_preferred && diff < target_diff)) {
            target_mode = mode;
            target_diff = diff;
            target_preferred = preferred;
        }
    }
    return target_mode;
}

static DisplayModePtr
xf86ClosestMode(xf86OutputPtr output,
                DisplayModePtr match, Rotation match_rotation,
                int width, int height)
{
    DisplayModePtr target_mode = NULL;
    DisplayModePtr mode;
    int target_diff = 0;

    /*
     * Pick a mode closest to the specified mode
     */
    for (mode = output->probed_modes; mode; mode = mode->next) {
        int dx, dy;
        int diff;

        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;

        /* exact matches are preferred */
        if (output->initial_rotation == match_rotation &&
            xf86ModesEqual(mode, match))
            return mode;

        dx = xf86ModeWidth(match, match_rotation) - xf86ModeWidth(mode,
                                                                  output->
                                                                  initial_rotation);
        dy = xf86ModeHeight(match, match_rotation) - xf86ModeHeight(mode,
                                                                    output->
                                                                    initial_rotation);
        diff = dx * dx + dy * dy;
        if (target_mode == NULL || diff < target_diff) {
            target_mode = mode;
            target_diff = diff;
        }
    }
    return target_mode;
}

static DisplayModePtr
xf86OutputHasPreferredMode(xf86OutputPtr output, int width, int height)
{
    DisplayModePtr mode;

    for (mode = output->probed_modes; mode; mode = mode->next) {
        if (xf86ModeWidth(mode, output->initial_rotation) > width ||
            xf86ModeHeight(mode, output->initial_rotation) > height)
            continue;

        if (mode->type & M_T_PREFERRED)
            return mode;
    }
    return NULL;
}

static DisplayModePtr
xf86OutputHasUserPreferredMode(xf86OutputPtr output)
{
    DisplayModePtr mode, first = output->probed_modes;

    for (mode = first; mode && mode->next != first; mode = mode->next)
        if (mode->type & M_T_USERPREF)
            return mode;

    return NULL;
}

static int
xf86PickCrtcs(ScrnInfoPtr scrn,
              xf86CrtcPtr * best_crtcs,
              DisplayModePtr * modes, int n, int width, int height)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int c, o;
    xf86OutputPtr output;
    xf86CrtcPtr crtc;
    xf86CrtcPtr *crtcs;
    int best_score;
    int score;
    int my_score;

    if (n == config->num_output)
        return 0;
    output = config->output[n];

    /*
     * Compute score with this output disabled
     */
    best_crtcs[n] = NULL;
    best_score = xf86PickCrtcs(scrn, best_crtcs, modes, n + 1, width, height);
    if (modes[n] == NULL)
        return best_score;

    crtcs = xallocarray(config->num_output, sizeof(xf86CrtcPtr));
    if (!crtcs)
        return best_score;

    my_score = 1;
    /* Score outputs that are known to be connected higher */
    if (output->status == XF86OutputStatusConnected)
        my_score++;
    /* Score outputs with preferred modes higher */
    if (xf86OutputHasPreferredMode(output, width, height))
        my_score++;
    /*
     * Select a crtc for this output and
     * then attempt to configure the remaining
     * outputs
     */
    for (c = 0; c < config->num_crtc; c++) {
        if ((output->possible_crtcs & (1 << c)) == 0)
            continue;

        crtc = config->crtc[c];
        /*
         * Check to see if some other output is
         * using this crtc
         */
        for (o = 0; o < n; o++)
            if (best_crtcs[o] == crtc)
                break;
        if (o < n) {
            /*
             * If the two outputs desire the same mode,
             * see if they can be cloned
             */
            if (xf86ModesEqual(modes[o], modes[n]) &&
                config->output[o]->initial_rotation ==
                config->output[n]->initial_rotation &&
                config->output[o]->initial_x == config->output[n]->initial_x &&
                config->output[o]->initial_y == config->output[n]->initial_y) {
                if ((output->possible_clones & (1 << o)) == 0)
                    continue;   /* nope, try next CRTC */
            }
            else
                continue;       /* different modes, can't clone */
        }
        crtcs[n] = crtc;
        memcpy(crtcs, best_crtcs, n * sizeof(xf86CrtcPtr));
        score =
            my_score + xf86PickCrtcs(scrn, crtcs, modes, n + 1, width, height);
        if (score > best_score) {
            best_score = score;
            memcpy(best_crtcs, crtcs, config->num_output * sizeof(xf86CrtcPtr));
        }
    }
    free(crtcs);
    return best_score;
}

/*
 * Compute the virtual size necessary to place all of the available
 * crtcs in the specified configuration.
 *
 * canGrow indicates that the driver can make the screen larger than its initial
 * configuration.  If FALSE, this function will enlarge the screen to include
 * the largest available mode.
 */

static void
xf86DefaultScreenLimits(ScrnInfoPtr scrn, int *widthp, int *heightp,
                        Bool canGrow)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int width = 0, height = 0;
    int o;
    int c;
    int s;

    for (c = 0; c < config->num_crtc; c++) {
        int crtc_width = 0, crtc_height = 0;
        xf86CrtcPtr crtc = config->crtc[c];

        if (crtc->enabled) {
            crtc_width =
                crtc->desiredX + xf86ModeWidth(&crtc->desiredMode,
                                               crtc->desiredRotation);
            crtc_height =
                crtc->desiredY + xf86ModeHeight(&crtc->desiredMode,
                                                crtc->desiredRotation);
        }
        if (!canGrow) {
            for (o = 0; o < config->num_output; o++) {
                xf86OutputPtr output = config->output[o];

                for (s = 0; s < config->num_crtc; s++)
                    if (output->possible_crtcs & (1 << s)) {
                        DisplayModePtr mode;

                        for (mode = output->probed_modes; mode;
                             mode = mode->next) {
                            if (mode->HDisplay > crtc_width)
                                crtc_width = mode->HDisplay;
                            if (mode->VDisplay > crtc_width)
                                crtc_width = mode->VDisplay;
                            if (mode->VDisplay > crtc_height)
                                crtc_height = mode->VDisplay;
                            if (mode->HDisplay > crtc_height)
                                crtc_height = mode->HDisplay;
                        }
                    }
            }
        }
        if (crtc_width > width)
            width = crtc_width;
        if (crtc_height > height)
            height = crtc_height;
    }
    if (config->maxWidth && width > config->maxWidth)
        width = config->maxWidth;
    if (config->maxHeight && height > config->maxHeight)
        height = config->maxHeight;
    if (config->minWidth && width < config->minWidth)
        width = config->minWidth;
    if (config->minHeight && height < config->minHeight)
        height = config->minHeight;
    *widthp = width;
    *heightp = height;
}

#define POSITION_UNSET	-100000

/*
 * check if the user configured any outputs at all
 * with either a position or a relative setting or a mode.
 */
static Bool
xf86UserConfiguredOutputs(ScrnInfoPtr scrn, DisplayModePtr * modes)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;
    Bool user_conf = FALSE;

    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];
        const char *position;
        const char *relative_name;
        OutputOpts relation;
        int r;

        static const OutputOpts relations[] = {
            OPTION_BELOW, OPTION_RIGHT_OF, OPTION_ABOVE, OPTION_LEFT_OF
        };

        position = xf86GetOptValString(output->options, OPTION_POSITION);
        if (position)
            user_conf = TRUE;

        relation = 0;
        relative_name = NULL;
        for (r = 0; r < 4; r++) {
            relation = relations[r];
            relative_name = xf86GetOptValString(output->options, relation);
            if (relative_name)
                break;
        }
        if (relative_name)
            user_conf = TRUE;

        modes[o] = xf86OutputHasUserPreferredMode(output);
        if (modes[o])
            user_conf = TRUE;
    }

    return user_conf;
}

static Bool
xf86InitialOutputPositions(ScrnInfoPtr scrn, DisplayModePtr * modes)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;
    int min_x, min_y;

    /* check for initial right-of heuristic */
    for (o = 0; o < config->num_output; o++)
    {
        xf86OutputPtr output = config->output[o];

        if (output->initial_x || output->initial_y)
            return TRUE;
    }

    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];

        output->initial_x = output->initial_y = POSITION_UNSET;
    }

    /*
     * Loop until all outputs are set
     */
    for (;;) {
        Bool any_set = FALSE;
        Bool keep_going = FALSE;

        for (o = 0; o < config->num_output; o++) {
            static const OutputOpts relations[] = {
                OPTION_BELOW, OPTION_RIGHT_OF, OPTION_ABOVE, OPTION_LEFT_OF
            };
            xf86OutputPtr output = config->output[o];
            xf86OutputPtr relative;
            const char *relative_name;
            const char *position;
            OutputOpts relation;
            int r;

            if (output->initial_x != POSITION_UNSET)
                continue;
            position = xf86GetOptValString(output->options, OPTION_POSITION);
            /*
             * Absolute position wins
             */
            if (position) {
                int x, y;

                if (sscanf(position, "%d %d", &x, &y) == 2) {
                    output->initial_x = x;
                    output->initial_y = y;
                }
                else {
                    xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                               "Output %s position not of form \"x y\"\n",
                               output->name);
                    output->initial_x = output->initial_y = 0;
                }
                any_set = TRUE;
                continue;
            }
            /*
             * Next comes relative positions
             */
            relation = 0;
            relative_name = NULL;
            for (r = 0; r < 4; r++) {
                relation = relations[r];
                relative_name = xf86GetOptValString(output->options, relation);
                if (relative_name)
                    break;
            }
            if (relative_name) {
                int or;

                relative = NULL;
                for (or = 0; or < config->num_output; or++) {
                    xf86OutputPtr out_rel = config->output[or];
                    XF86ConfMonitorPtr rel_mon = out_rel->conf_monitor;

                    if (rel_mon) {
                        if (xf86nameCompare(rel_mon->mon_identifier,
                                            relative_name) == 0) {
                            relative = config->output[or];
                            break;
                        }
                    }
                    if (strcmp(out_rel->name, relative_name) == 0) {
                        relative = config->output[or];
                        break;
                    }
                }
                if (!relative) {
                    xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                               "Cannot position output %s relative to unknown output %s\n",
                               output->name, relative_name);
                    output->initial_x = 0;
                    output->initial_y = 0;
                    any_set = TRUE;
                    continue;
                }
                if (!modes[or]) {
                    xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                               "Cannot position output %s relative to output %s without modes\n",
                               output->name, relative_name);
                    output->initial_x = 0;
                    output->initial_y = 0;
                    any_set = TRUE;
                    continue;
                }
                if (relative->initial_x == POSITION_UNSET) {
                    keep_going = TRUE;
                    continue;
                }
                output->initial_x = relative->initial_x;
                output->initial_y = relative->initial_y;
                switch (relation) {
                case OPTION_BELOW:
                    output->initial_y +=
                        xf86ModeHeight(modes[or], relative->initial_rotation);
                    break;
                case OPTION_RIGHT_OF:
                    output->initial_x +=
                        xf86ModeWidth(modes[or], relative->initial_rotation);
                    break;
                case OPTION_ABOVE:
                    if (modes[o])
                        output->initial_y -=
                            xf86ModeHeight(modes[o], output->initial_rotation);
                    break;
                case OPTION_LEFT_OF:
                    if (modes[o])
                        output->initial_x -=
                            xf86ModeWidth(modes[o], output->initial_rotation);
                    break;
                default:
                    break;
                }
                any_set = TRUE;
                continue;
            }

            /* Nothing set, just stick them at 0,0 */
            output->initial_x = 0;
            output->initial_y = 0;
            any_set = TRUE;
        }
        if (!keep_going)
            break;
        if (!any_set) {
            for (o = 0; o < config->num_output; o++) {
                xf86OutputPtr output = config->output[o];

                if (output->initial_x == POSITION_UNSET) {
                    xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                               "Output position loop. Moving %s to 0,0\n",
                               output->name);
                    output->initial_x = output->initial_y = 0;
                    break;
                }
            }
        }
    }

    /*
     * normalize positions
     */
    min_x = 1000000;
    min_y = 1000000;
    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];

        if (output->initial_x < min_x)
            min_x = output->initial_x;
        if (output->initial_y < min_y)
            min_y = output->initial_y;
    }

    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];

        output->initial_x -= min_x;
        output->initial_y -= min_y;
    }
    return TRUE;
}

static void
xf86InitialPanning(ScrnInfoPtr scrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;

    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];
        const char *panning = xf86GetOptValString(output->options, OPTION_PANNING);
        int width, height, left, top;
        int track_width, track_height, track_left, track_top;
        int brdr[4];

        memset(&output->initialTotalArea, 0, sizeof(BoxRec));
        memset(&output->initialTrackingArea, 0, sizeof(BoxRec));
        memset(output->initialBorder, 0, 4 * sizeof(INT16));

        if (!panning)
            continue;

        switch (sscanf(panning, "%dx%d+%d+%d/%dx%d+%d+%d/%d/%d/%d/%d",
                       &width, &height, &left, &top,
                       &track_width, &track_height, &track_left, &track_top,
                       &brdr[0], &brdr[1], &brdr[2], &brdr[3])) {
        case 12:
            output->initialBorder[0] = brdr[0];
            output->initialBorder[1] = brdr[1];
            output->initialBorder[2] = brdr[2];
            output->initialBorder[3] = brdr[3];
            /* fall through */
        case 8:
            output->initialTrackingArea.x1 = track_left;
            output->initialTrackingArea.y1 = track_top;
            output->initialTrackingArea.x2 = track_left + track_width;
            output->initialTrackingArea.y2 = track_top + track_height;
            /* fall through */
        case 4:
            output->initialTotalArea.x1 = left;
            output->initialTotalArea.y1 = top;
            /* fall through */
        case 2:
            output->initialTotalArea.x2 = output->initialTotalArea.x1 + width;
            output->initialTotalArea.y2 = output->initialTotalArea.y1 + height;
            break;
        default:
            xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                       "Broken panning specification '%s' for output %s in config file\n",
                       panning, output->name);
        }
    }
}

/** Return - 0 + if a should be earlier, same or later than b in list
 */
static int
xf86ModeCompare(DisplayModePtr a, DisplayModePtr b)
{
    int diff;

    diff = ((b->type & M_T_PREFERRED) != 0) - ((a->type & M_T_PREFERRED) != 0);
    if (diff)
        return diff;
    diff = b->HDisplay * b->VDisplay - a->HDisplay * a->VDisplay;
    if (diff)
        return diff;
    diff = b->Clock - a->Clock;
    return diff;
}

/**
 * Insertion sort input in-place and return the resulting head
 */
static DisplayModePtr
xf86SortModes(DisplayModePtr input)
{
    DisplayModePtr output = NULL, i, o, n, *op, prev;

    /* sort by preferred status and pixel area */
    while (input) {
        i = input;
        input = input->next;
        for (op = &output; (o = *op); op = &o->next)
            if (xf86ModeCompare(o, i) > 0)
                break;
        i->next = *op;
        *op = i;
    }
    /* prune identical modes */
    for (o = output; o && (n = o->next); o = n) {
        if (!strcmp(o->name, n->name) && xf86ModesEqual(o, n)) {
            o->next = n->next;
            free((void *) n->name);
            free(n);
            n = o;
        }
    }
    /* hook up backward links */
    prev = NULL;
    for (o = output; o; o = o->next) {
        o->prev = prev;
        prev = o;
    }
    return output;
}

static const char *
preferredMode(ScrnInfoPtr pScrn, xf86OutputPtr output)
{
    const char *preferred_mode = NULL;

    /* Check for a configured preference for a particular mode */
    preferred_mode = xf86GetOptValString(output->options,
                                         OPTION_PREFERRED_MODE);
    if (preferred_mode)
        return preferred_mode;

    if (pScrn->display->modes && *pScrn->display->modes)
        preferred_mode = *pScrn->display->modes;

    return preferred_mode;
}

/** identify a token
 * args
 *   *src     a string with zero or more tokens, e.g. "tok0 tok1",
 *   **token  stores a pointer to the first token character,
 *   *len     stores the token length.
 * return
 *   a pointer into src[] at the token terminating character, or
 *   NULL if no token is found.
 */
static const char *
gettoken(const char *src, const char **token, int *len)
{
    const char *delim = " \t";
    int skip;

    if (!src)
        return NULL;

    skip = strspn(src, delim);
    *token = &src[skip];

    *len = strcspn(*token, delim);
    /* Support for backslash escaped delimiters could be implemented
     * here.
     */

    /* (*token)[0] != '\0'  <==>  *len > 0 */
    if (*len > 0)
        return &(*token)[*len];
    else
        return NULL;
}

/** Check for a user configured zoom mode list, Option "ZoomModes":
 *
 * Section "Monitor"
 *   Identifier "a21inch"
 *   Option "ZoomModes" "1600x1200 1280x1024 1280x1024 640x480"
 * EndSection
 *
 * Each user mode name is searched for independently so the list
 * specification order is free.  An output mode is matched at most
 * once, a mode with an already set M_T_USERDEF type bit is skipped.
 * Thus a repeat mode name specification matches the next output mode
 * with the same name.
 *
 * Ctrl+Alt+Keypad-{Plus,Minus} zooms {in,out} by selecting the
 * {next,previous} M_T_USERDEF mode in the screen modes list, itself
 * sorted toward lower dot area or lower dot clock frequency, see
 *   modes/xf86Crtc.c: xf86SortModes() xf86SetScrnInfoModes(), and
 *   common/xf86Cursor.c: xf86ZoomViewport().
 */
static int
processZoomModes(xf86OutputPtr output)
{
    const char *zoom_modes;
    int count = 0;

    zoom_modes = xf86GetOptValString(output->options, OPTION_ZOOM_MODES);

    if (zoom_modes) {
        const char *token, *next;
        int len;

        next = gettoken(zoom_modes, &token, &len);
        while (next) {
            DisplayModePtr mode;

            for (mode = output->probed_modes; mode; mode = mode->next)
                if (!strncmp(token, mode->name, len)  /* prefix match */
                    && mode->name[len] == '\0'        /* equal length */
                    && !(mode->type & M_T_USERDEF)) { /* no rematch */
                    mode->type |= M_T_USERDEF;
                    break;
                }

            count++;
            next = gettoken(next, &token, &len);
        }
    }

    return count;
}

static void
GuessRangeFromModes(MonPtr mon, DisplayModePtr mode)
{
    if (!mon || !mode)
        return;

    mon->nHsync = 1;
    mon->hsync[0].lo = 1024.0;
    mon->hsync[0].hi = 0.0;

    mon->nVrefresh = 1;
    mon->vrefresh[0].lo = 1024.0;
    mon->vrefresh[0].hi = 0.0;

    while (mode) {
        if (!mode->HSync)
            mode->HSync = ((float) mode->Clock) / ((float) mode->HTotal);

        if (!mode->VRefresh)
            mode->VRefresh = (1000.0 * ((float) mode->Clock)) /
                ((float) (mode->HTotal * mode->VTotal));

        if (mode->HSync < mon->hsync[0].lo)
            mon->hsync[0].lo = mode->HSync;

        if (mode->HSync > mon->hsync[0].hi)
            mon->hsync[0].hi = mode->HSync;

        if (mode->VRefresh < mon->vrefresh[0].lo)
            mon->vrefresh[0].lo = mode->VRefresh;

        if (mode->VRefresh > mon->vrefresh[0].hi)
            mon->vrefresh[0].hi = mode->VRefresh;

        mode = mode->next;
    }

    /* stretch out the bottom to fit 640x480@60 */
    if (mon->hsync[0].lo > 31.0)
        mon->hsync[0].lo = 31.0;
    if (mon->vrefresh[0].lo > 58.0)
        mon->vrefresh[0].lo = 58.0;
}

enum det_monrec_source {
    sync_config, sync_edid, sync_default
};

struct det_monrec_parameter {
    MonRec *mon_rec;
    int *max_clock;
    Bool set_hsync;
    Bool set_vrefresh;
    enum det_monrec_source *sync_source;
};

static void
handle_detailed_monrec(struct detailed_monitor_section *det_mon, void *data)
{
    struct det_monrec_parameter *p;

    p = (struct det_monrec_parameter *) data;

    if (det_mon->type == DS_RANGES) {
        struct monitor_ranges *ranges = &det_mon->section.ranges;

        if (p->set_hsync && ranges->max_h) {
            p->mon_rec->hsync[p->mon_rec->nHsync].lo = ranges->min_h;
            p->mon_rec->hsync[p->mon_rec->nHsync].hi = ranges->max_h;
            p->mon_rec->nHsync++;
            if (*p->sync_source == sync_default)
                *p->sync_source = sync_edid;
        }
        if (p->set_vrefresh && ranges->max_v) {
            p->mon_rec->vrefresh[p->mon_rec->nVrefresh].lo = ranges->min_v;
            p->mon_rec->vrefresh[p->mon_rec->nVrefresh].hi = ranges->max_v;
            p->mon_rec->nVrefresh++;
            if (*p->sync_source == sync_default)
                *p->sync_source = sync_edid;
        }
        if (ranges->max_clock * 1000 > *p->max_clock)
            *p->max_clock = ranges->max_clock * 1000;
    }
}

void
xf86ProbeOutputModes(ScrnInfoPtr scrn, int maxX, int maxY)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;

    /* When canGrow was TRUE in the initial configuration we have to
     * compare against the maximum values so that we don't drop modes.
     * When canGrow was FALSE, the maximum values would have been clamped
     * anyway.
     */
    if (maxX == 0 || maxY == 0) {
        maxX = config->maxWidth;
        maxY = config->maxHeight;
    }

    /* Probe the list of modes for each output. */
    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];
        DisplayModePtr mode;
        DisplayModePtr config_modes = NULL, output_modes, default_modes = NULL;
        const char *preferred_mode;
        xf86MonPtr edid_monitor;
        XF86ConfMonitorPtr conf_monitor;
        MonRec mon_rec;
        int min_clock = 0;
        int max_clock = 0;
        double clock;
        Bool add_default_modes;
        Bool debug_modes = config->debug_modes || xf86Initialising;
        enum det_monrec_source sync_source = sync_default;

        while (output->probed_modes != NULL)
            xf86DeleteMode(&output->probed_modes, output->probed_modes);

        /*
         * Check connection status
         */
        output->status = (*output->funcs->detect) (output);

        if (output->status == XF86OutputStatusDisconnected &&
            !xf86ReturnOptValBool(output->options, OPTION_ENABLE, FALSE)) {
            xf86OutputSetEDID(output, NULL);
            continue;
        }

        memset(&mon_rec, '\0', sizeof(mon_rec));

        conf_monitor = output->conf_monitor;

        if (conf_monitor) {
            int i;

            for (i = 0; i < conf_monitor->mon_n_hsync; i++) {
                mon_rec.hsync[mon_rec.nHsync].lo =
                    conf_monitor->mon_hsync[i].lo;
                mon_rec.hsync[mon_rec.nHsync].hi =
                    conf_monitor->mon_hsync[i].hi;
                mon_rec.nHsync++;
                sync_source = sync_config;
            }
            for (i = 0; i < conf_monitor->mon_n_vrefresh; i++) {
                mon_rec.vrefresh[mon_rec.nVrefresh].lo =
                    conf_monitor->mon_vrefresh[i].lo;
                mon_rec.vrefresh[mon_rec.nVrefresh].hi =
                    conf_monitor->mon_vrefresh[i].hi;
                mon_rec.nVrefresh++;
                sync_source = sync_config;
            }
            config_modes = xf86GetMonitorModes(scrn, conf_monitor);
        }

        output_modes = (*output->funcs->get_modes) (output);

        /*
         * If the user has a preference, respect it.
         * Otherwise, don't second-guess the driver.
         */
        if (!xf86GetOptValBool(output->options, OPTION_DEFAULT_MODES,
                               &add_default_modes))
            add_default_modes = (output_modes == NULL);

        edid_monitor = output->MonInfo;

        if (edid_monitor) {
            struct det_monrec_parameter p;
            struct cea_data_block *hdmi_db;

            /* if display is not continuous-frequency, don't add default modes */
            if (!gtf_supported(edid_monitor))
                add_default_modes = FALSE;

            p.mon_rec = &mon_rec;
            p.max_clock = &max_clock;
            p.set_hsync = mon_rec.nHsync == 0;
            p.set_vrefresh = mon_rec.nVrefresh == 0;
            p.sync_source = &sync_source;

            xf86ForEachDetailedBlock(edid_monitor, handle_detailed_monrec, &p);

            /* Look at the CEA HDMI vendor block for the max TMDS freq */
            hdmi_db = xf86MonitorFindHDMIBlock(edid_monitor);
            if (hdmi_db && hdmi_db->len >= 7) {
                int tmds_freq = hdmi_db->u.vendor.hdmi.max_tmds_clock * 5000;
                xf86DrvMsg(scrn->scrnIndex, X_PROBED,
                           "HDMI max TMDS frequency %dKHz\n", tmds_freq);
                if (tmds_freq > max_clock)
                    max_clock = tmds_freq;
            }
        }

        if (xf86GetOptValFreq(output->options, OPTION_MIN_CLOCK,
                              OPTUNITS_KHZ, &clock))
            min_clock = (int) clock;
        if (xf86GetOptValFreq(output->options, OPTION_MAX_CLOCK,
                              OPTUNITS_KHZ, &clock))
            max_clock = (int) clock;

        /* If we still don't have a sync range, guess wildly */
        if (!mon_rec.nHsync || !mon_rec.nVrefresh)
            GuessRangeFromModes(&mon_rec, output_modes);

        /*
         * These limits will end up setting a 1024x768@60Hz mode by default,
         * which seems like a fairly good mode to use when nothing else is
         * specified
         */
        if (mon_rec.nHsync == 0) {
            mon_rec.hsync[0].lo = 31.0;
            mon_rec.hsync[0].hi = 55.0;
            mon_rec.nHsync = 1;
        }
        if (mon_rec.nVrefresh == 0) {
            mon_rec.vrefresh[0].lo = 58.0;
            mon_rec.vrefresh[0].hi = 62.0;
            mon_rec.nVrefresh = 1;
        }

        if (add_default_modes)
            default_modes = xf86GetDefaultModes();

        /*
         * If this is not an RB monitor, remove RB modes from the default
         * pool.  RB modes from the config or the monitor itself are fine.
         */
        if (!mon_rec.reducedblanking)
            xf86ValidateModesReducedBlanking(scrn, default_modes);

        if (sync_source == sync_config) {
            /*
             * Check output and config modes against sync range from config file
             */
            xf86ValidateModesSync(scrn, output_modes, &mon_rec);
            xf86ValidateModesSync(scrn, config_modes, &mon_rec);
        }
        /*
         * Check default modes against sync range
         */
        xf86ValidateModesSync(scrn, default_modes, &mon_rec);
        /*
         * Check default modes against monitor max clock
         */
        if (max_clock) {
            xf86ValidateModesClocks(scrn, default_modes,
                                    &min_clock, &max_clock, 1);
            xf86ValidateModesClocks(scrn, output_modes,
                                    &min_clock, &max_clock, 1);
        }

        output->probed_modes = NULL;
        output->probed_modes = xf86ModesAdd(output->probed_modes, config_modes);
        output->probed_modes = xf86ModesAdd(output->probed_modes, output_modes);
        output->probed_modes =
            xf86ModesAdd(output->probed_modes, default_modes);

        /*
         * Check all modes against max size, interlace, and doublescan
         */
        if (maxX && maxY)
            xf86ValidateModesSize(scrn, output->probed_modes, maxX, maxY, 0);

        {
            int flags = (output->interlaceAllowed ? V_INTERLACE : 0) |
                (output->doubleScanAllowed ? V_DBLSCAN : 0);
            xf86ValidateModesFlags(scrn, output->probed_modes, flags);
        }

        /*
         * Check all modes against output
         */
        for (mode = output->probed_modes; mode != NULL; mode = mode->next)
            if (mode->status == MODE_OK)
                mode->status = (*output->funcs->mode_valid) (output, mode);

        xf86PruneInvalidModes(scrn, &output->probed_modes, debug_modes);

        output->probed_modes = xf86SortModes(output->probed_modes);

        /* Check for a configured preference for a particular mode */
        preferred_mode = preferredMode(scrn, output);

        if (preferred_mode) {
            for (mode = output->probed_modes; mode; mode = mode->next) {
                if (!strcmp(preferred_mode, mode->name)) {
                    if (mode != output->probed_modes) {
                        if (mode->prev)
                            mode->prev->next = mode->next;
                        if (mode->next)
                            mode->next->prev = mode->prev;
                        mode->next = output->probed_modes;
                        output->probed_modes->prev = mode;
                        mode->prev = NULL;
                        output->probed_modes = mode;
                    }
                    mode->type |= (M_T_PREFERRED | M_T_USERPREF);
                    break;
                }
            }
        }

        /* Ctrl+Alt+Keypad-{Plus,Minus} zoom mode: M_T_USERDEF mode type */
        processZoomModes(output);

        output->initial_rotation = xf86OutputInitialRotation(output);

        if (debug_modes) {
            if (output->probed_modes != NULL) {
                xf86DrvMsg(scrn->scrnIndex, X_INFO,
                           "Printing probed modes for output %s\n",
                           output->name);
            }
            else {
                xf86DrvMsg(scrn->scrnIndex, X_INFO,
                           "No remaining probed modes for output %s\n",
                           output->name);
            }
        }
        for (mode = output->probed_modes; mode != NULL; mode = mode->next) {
            /* The code to choose the best mode per pipe later on will require
             * VRefresh to be set.
             */
            mode->VRefresh = xf86ModeVRefresh(mode);
            xf86SetModeCrtc(mode, INTERLACE_HALVE_V);

            if (debug_modes)
                xf86PrintModeline(scrn->scrnIndex, mode);
        }
    }
}

/**
 * Copy one of the output mode lists to the ScrnInfo record
 */

static DisplayModePtr
biggestMode(DisplayModePtr a, DisplayModePtr b)
{
    int A, B;

    if (!a)
        return b;
    if (!b)
        return a;

    A = a->HDisplay * a->VDisplay;
    B = b->HDisplay * b->VDisplay;

    if (A > B)
        return a;

    return b;
}

static xf86OutputPtr
SetCompatOutput(xf86CrtcConfigPtr config)
{
    xf86OutputPtr output = NULL, test = NULL;
    DisplayModePtr maxmode = NULL, testmode, mode;
    int o, compat = -1, count, mincount = 0;

    if (config->num_output == 0)
        return NULL;

    /* Look for one that's definitely connected */
    for (o = 0; o < config->num_output; o++) {
        test = config->output[o];
        if (!test->crtc)
            continue;
        if (test->status != XF86OutputStatusConnected)
            continue;
        if (!test->probed_modes)
            continue;

        testmode = mode = test->probed_modes;
        for (count = 0; mode; mode = mode->next, count++)
            testmode = biggestMode(testmode, mode);

        if (!output) {
            output = test;
            compat = o;
            maxmode = testmode;
            mincount = count;
        }
        else if (maxmode == biggestMode(maxmode, testmode)) {
            output = test;
            compat = o;
            maxmode = testmode;
            mincount = count;
        }
        else if ((maxmode->HDisplay == testmode->HDisplay) &&
                 (maxmode->VDisplay == testmode->VDisplay) &&
                 count <= mincount) {
            output = test;
            compat = o;
            maxmode = testmode;
            mincount = count;
        }
    }

    /* If we didn't find one, take anything we can get */
    if (!output) {
        for (o = 0; o < config->num_output; o++) {
            test = config->output[o];
            if (!test->crtc)
                continue;
            if (!test->probed_modes)
                continue;

            if (!output) {
                output = test;
                compat = o;
            }
            else if (test->probed_modes->HDisplay <
                     output->probed_modes->HDisplay) {
                output = test;
                compat = o;
            }
        }
    }

    if (compat >= 0) {
        config->compat_output = compat;
    }
    else if (config->compat_output >= 0 && config->compat_output < config->num_output) {
        /* Don't change the compat output when no valid outputs found */
        output = config->output[config->compat_output];
    }

    /* All outputs are disconnected, select one to fake */
    if (!output && config->num_output) {
        config->compat_output = 0;
        output = config->output[config->compat_output];
    }

    return output;
}

void
xf86SetScrnInfoModes(ScrnInfoPtr scrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    xf86OutputPtr output;
    xf86CrtcPtr crtc;
    DisplayModePtr last, mode = NULL;

    output = SetCompatOutput(config);

    if (!output)
        return;                 /* punt */

    crtc = output->crtc;

    /* Clear any existing modes from scrn->modes */
    while (scrn->modes != NULL)
        xf86DeleteMode(&scrn->modes, scrn->modes);

    /* Set scrn->modes to the mode list for the 'compat' output */
    scrn->modes = xf86DuplicateModes(scrn, output->probed_modes);

    if (crtc) {
        for (mode = scrn->modes; mode; mode = mode->next)
            if (xf86ModesEqual(mode, &crtc->desiredMode))
                break;
    }

    if (!scrn->modes) {
        scrn->modes = xf86ModesAdd(scrn->modes,
                                   xf86CVTMode(scrn->display->virtualX,
                                               scrn->display->virtualY,
                                               60, 0, 0));
    }

    /* For some reason, scrn->modes is circular, unlike the other mode
     * lists.  How great is that?
     */
    for (last = scrn->modes; last && last->next; last = last->next);
    last->next = scrn->modes;
    scrn->modes->prev = last;
    if (mode) {
        while (scrn->modes != mode)
            scrn->modes = scrn->modes->next;
    }

    scrn->currentMode = scrn->modes;
#ifdef XFreeXDGA
    if (scrn->pScreen)
        _xf86_di_dga_reinit_internal(scrn->pScreen);
#endif
}

static Bool
xf86CollectEnabledOutputs(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                          Bool *enabled)
{
    Bool any_enabled = FALSE;
    int o;

    /*
     * Don't bother enabling outputs on GPU screens: a client needs to attach
     * it to a source provider before setting a mode that scans out a shared
     * pixmap.
     */
    if (scrn->is_gpu)
        return FALSE;

    for (o = 0; o < config->num_output; o++)
        any_enabled |= enabled[o] = xf86OutputEnabled(config->output[o], TRUE);

    if (!any_enabled) {
        xf86DrvMsg(scrn->scrnIndex, X_WARNING,
                   "No outputs definitely connected, trying again...\n");

        for (o = 0; o < config->num_output; o++)
            any_enabled |= enabled[o] =
                xf86OutputEnabled(config->output[o], FALSE);
    }

    return any_enabled;
}

static Bool
nextEnabledOutput(xf86CrtcConfigPtr config, Bool *enabled, int *index)
{
    int o = *index;

    for (o++; o < config->num_output; o++) {
        if (enabled[o]) {
            *index = o;
            return TRUE;
        }
    }

    return FALSE;
}

static Bool
aspectMatch(float a, float b)
{
    return fabs(1 - (a / b)) < 0.05;
}

static DisplayModePtr
nextAspectMode(xf86OutputPtr o, DisplayModePtr last, float aspect)
{
    DisplayModePtr m = NULL;

    if (!o)
        return NULL;

    if (!last)
        m = o->probed_modes;
    else
        m = last->next;

    for (; m; m = m->next)
        if (aspectMatch(aspect, (float) m->HDisplay / (float) m->VDisplay))
            return m;

    return NULL;
}

static DisplayModePtr
bestModeForAspect(xf86CrtcConfigPtr config, Bool *enabled, float aspect)
{
    int o = -1, p;
    DisplayModePtr mode = NULL, test = NULL, match = NULL;

    if (!nextEnabledOutput(config, enabled, &o))
        return NULL;
    while ((mode = nextAspectMode(config->output[o], mode, aspect))) {
        test = mode;
        for (p = o; nextEnabledOutput(config, enabled, &p);) {
            test = xf86OutputFindClosestMode(config->output[p], mode);
            if (!test)
                break;
            if (test->HDisplay != mode->HDisplay ||
                test->VDisplay != mode->VDisplay) {
                test = NULL;
                break;
            }
        }

        /* if we didn't match it on all outputs, try the next one */
        if (!test)
            continue;

        /* if it's bigger than the last one, save it */
        if (!match || (test->HDisplay > match->HDisplay))
            match = test;
    }

    /* return the biggest one found */
    return match;
}

static int
numEnabledOutputs(xf86CrtcConfigPtr config, Bool *enabled)
{
    int i = 0, p;

    for (i = 0, p = -1; nextEnabledOutput(config, enabled, &p); i++) ;

    return i;
}

static Bool
xf86TargetRightOf(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                  DisplayModePtr *modes, Bool *enabled,
                  int width, int height)
{
    int o;
    int w = 0;
    Bool has_tile = FALSE;
    uint32_t configured_outputs;

    xf86GetOptValBool(config->options, OPTION_PREFER_CLONEMODE,
                      &scrn->preferClone);
    if (scrn->preferClone)
        return FALSE;

    if (numEnabledOutputs(config, enabled) < 2)
        return FALSE;

    for (o = -1; nextEnabledOutput(config, enabled, &o); ) {
        DisplayModePtr mode =
            xf86OutputHasPreferredMode(config->output[o], width, height);

        if (!mode)
            return FALSE;

        w += mode->HDisplay;
    }

    if (w > width)
        return FALSE;

    w = 0;
    configured_outputs = 0;

    for (o = -1; nextEnabledOutput(config, enabled, &o); ) {
        DisplayModePtr mode =
            xf86OutputHasPreferredMode(config->output[o], width, height);

        if (configured_outputs & (1 << o))
            continue;

        if (config->output[o]->tile_info.group_id) {
            has_tile = TRUE;
            continue;
        }

        config->output[o]->initial_x = w;
        w += mode->HDisplay;

        configured_outputs |= (1 << o);
        modes[o] = mode;
    }

    if (has_tile) {
        for (o = -1; nextEnabledOutput(config, enabled, &o); ) {
            int ht, vt, ot;
            int add_x, cur_x = w;
            struct xf86CrtcTileInfo *tile_info = &config->output[o]->tile_info, *this_tile;
            if (configured_outputs & (1 << o))
                continue;
            if (!tile_info->group_id)
                continue;

            if (tile_info->tile_h_loc != 0 && tile_info->tile_v_loc != 0)
                continue;

            for (ht = 0; ht < tile_info->num_h_tile; ht++) {
                int cur_y = 0;
                add_x = 0;
                for (vt = 0; vt < tile_info->num_v_tile; vt++) {

                    for (ot = -1; nextEnabledOutput(config, enabled, &ot); ) {

                        DisplayModePtr mode =
                            xf86OutputHasPreferredMode(config->output[ot], width, height);
                        if (!config->output[ot]->tile_info.group_id)
                            continue;

                        this_tile = &config->output[ot]->tile_info;
                        if (this_tile->group_id != tile_info->group_id)
                            continue;

                        if (this_tile->tile_h_loc != ht ||
                            this_tile->tile_v_loc != vt)
                            continue;

                        config->output[ot]->initial_x = cur_x;
                        config->output[ot]->initial_y = cur_y;

                        if (vt == 0)
                            add_x = this_tile->tile_h_size;
                        cur_y += this_tile->tile_v_size;
                        configured_outputs |= (1 << ot);
                        modes[ot] = mode;
                    }
                }
                cur_x += add_x;
            }
            w = cur_x;
        }
    }
    return TRUE;
}

static Bool
xf86TargetPreferred(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                    DisplayModePtr * modes, Bool *enabled,
                    int width, int height)
{
    int o, p;
    int max_pref_width = 0, max_pref_height = 0;
    DisplayModePtr *preferred, *preferred_match;
    Bool ret = FALSE;

    preferred = xnfcalloc(config->num_output, sizeof(DisplayModePtr));
    preferred_match = xnfcalloc(config->num_output, sizeof(DisplayModePtr));

    /* Check if the preferred mode is available on all outputs */
    for (p = -1; nextEnabledOutput(config, enabled, &p);) {
        Rotation r = config->output[p]->initial_rotation;
        DisplayModePtr mode;

        if ((preferred[p] = xf86OutputHasPreferredMode(config->output[p],
                                                       width, height))) {
            int pref_width = xf86ModeWidth(preferred[p], r);
            int pref_height = xf86ModeHeight(preferred[p], r);
            Bool all_match = TRUE;

            for (o = -1; nextEnabledOutput(config, enabled, &o);) {
                Bool match = FALSE;
                xf86OutputPtr output = config->output[o];

                if (o == p)
                    continue;

                /*
                 * First see if the preferred mode matches on the next
                 * output as well.  This catches the common case of identical
                 * monitors and makes sure they all have the same timings
                 * and refresh.  If that fails, we fall back to trying to
                 * match just width & height.
                 */
                mode = xf86OutputHasPreferredMode(output, pref_width,
                                                  pref_height);
                if (mode && xf86ModesEqual(mode, preferred[p])) {
                    preferred[o] = mode;
                    match = TRUE;
                }
                else {
                    for (mode = output->probed_modes; mode; mode = mode->next) {
                        Rotation ir = output->initial_rotation;

                        if (xf86ModeWidth(mode, ir) == pref_width &&
                            xf86ModeHeight(mode, ir) == pref_height) {
                            preferred[o] = mode;
                            match = TRUE;
                        }
                    }
                }

                all_match &= match;
            }

            if (all_match &&
                (pref_width * pref_height > max_pref_width * max_pref_height)) {
                for (o = -1; nextEnabledOutput(config, enabled, &o);)
                    preferred_match[o] = preferred[o];
                max_pref_width = pref_width;
                max_pref_height = pref_height;
                ret = TRUE;
            }
        }
    }

    /*
     * If there's no preferred mode, but only one monitor, pick the
     * biggest mode for its aspect ratio or 4:3, assuming one exists.
     */
    if (!ret)
        do {
            float aspect = 0.0;
            DisplayModePtr a = NULL, b = NULL;

            if (numEnabledOutputs(config, enabled) != 1)
                break;

            p = -1;
            nextEnabledOutput(config, enabled, &p);
            if (config->output[p]->mm_height)
                aspect = (float) config->output[p]->mm_width /
                    (float) config->output[p]->mm_height;

            a = bestModeForAspect(config, enabled, 4.0/3.0);
            if (aspect)
                b = bestModeForAspect(config, enabled, aspect);

            preferred_match[p] = biggestMode(a, b);

            if (preferred_match[p])
                ret = TRUE;

        } while (0);

    if (ret) {
        /* oh good, there is a match.  stash the selected modes and return. */
        memcpy(modes, preferred_match,
               config->num_output * sizeof(DisplayModePtr));
    }

    free(preferred);
    free(preferred_match);
    return ret;
}

static Bool
xf86TargetAspect(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                 DisplayModePtr * modes, Bool *enabled, int width, int height)
{
    int o;
    float aspect = 0.0, *aspects;
    xf86OutputPtr output;
    Bool ret = FALSE;
    DisplayModePtr guess = NULL, aspect_guess = NULL, base_guess = NULL;

    aspects = xnfcalloc(config->num_output, sizeof(float));

    /* collect the aspect ratios */
    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        output = config->output[o];
        if (output->mm_height)
            aspects[o] = (float) output->mm_width / (float) output->mm_height;
        else
            aspects[o] = 4.0 / 3.0;
    }

    /* check that they're all the same */
    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        output = config->output[o];
        if (!aspect) {
            aspect = aspects[o];
        }
        else if (!aspectMatch(aspect, aspects[o])) {
            goto no_aspect_match;
        }
    }

    /* if they're all 4:3, just skip ahead and save effort */
    if (!aspectMatch(aspect, 4.0 / 3.0))
        aspect_guess = bestModeForAspect(config, enabled, aspect);

 no_aspect_match:
    base_guess = bestModeForAspect(config, enabled, 4.0 / 3.0);

    guess = biggestMode(base_guess, aspect_guess);

    if (!guess)
        goto out;

    /* found a mode that works everywhere, now apply it */
    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        modes[o] = xf86OutputFindClosestMode(config->output[o], guess);
    }
    ret = TRUE;

 out:
    free(aspects);
    return ret;
}

static Bool
xf86TargetFallback(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                   DisplayModePtr * modes, Bool *enabled, int width, int height)
{
    DisplayModePtr target_mode = NULL;
    Rotation target_rotation = RR_Rotate_0;
    DisplayModePtr default_mode;
    int default_preferred, target_preferred = 0, o;

    /* User preferred > preferred > other modes */
    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        default_mode = xf86DefaultMode(config->output[o], width, height);
        if (!default_mode)
            continue;

        default_preferred = (((default_mode->type & M_T_PREFERRED) != 0) +
                             ((default_mode->type & M_T_USERPREF) != 0));

        if (default_preferred > target_preferred || !target_mode) {
            target_mode = default_mode;
            target_preferred = default_preferred;
            target_rotation = config->output[o]->initial_rotation;
            config->compat_output = o;
        }
    }

    if (target_mode)
        modes[config->compat_output] = target_mode;

    /* Fill in other output modes */
    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        if (!modes[o])
            modes[o] = xf86ClosestMode(config->output[o], target_mode,
                                       target_rotation, width, height);
    }

    return target_mode != NULL;
}

static Bool
xf86TargetUserpref(ScrnInfoPtr scrn, xf86CrtcConfigPtr config,
                   DisplayModePtr * modes, Bool *enabled, int width, int height)
{
    int o;

    if (xf86UserConfiguredOutputs(scrn, modes))
        return xf86TargetFallback(scrn, config, modes, enabled, width, height);

    for (o = -1; nextEnabledOutput(config, enabled, &o);)
        if (xf86OutputHasUserPreferredMode(config->output[o]))
            return
                xf86TargetFallback(scrn, config, modes, enabled, width, height);

    return FALSE;
}

/**
 * Construct default screen configuration
 *
 * Given auto-detected (and, eventually, configured) values,
 * construct a usable configuration for the system
 *
 * canGrow indicates that the driver can resize the screen to larger than its
 * initially configured size via the config->funcs->resize hook.  If TRUE, this
 * function will set virtualX and virtualY to match the initial configuration
 * and leave config->max{Width,Height} alone.  If FALSE, it will bloat
 * virtual[XY] to include the largest modes and set config->max{Width,Height}
 * accordingly.
 */

Bool
xf86InitialConfiguration(ScrnInfoPtr scrn, Bool canGrow)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o, c;
    xf86CrtcPtr *crtcs;
    DisplayModePtr *modes;
    Bool *enabled;
    int width, height;
    int i = scrn->scrnIndex;
    Bool have_outputs = TRUE;
    Bool ret;
    Bool success = FALSE;

    /* Set up the device options */
    config->options = xnfalloc(sizeof(xf86DeviceOptions));
    memcpy(config->options, xf86DeviceOptions, sizeof(xf86DeviceOptions));
    xf86ProcessOptions(scrn->scrnIndex, scrn->options, config->options);
    config->debug_modes = xf86ReturnOptValBool(config->options,
                                               OPTION_MODEDEBUG, FALSE);

    if (scrn->display->virtualX && !scrn->is_gpu)
        width = scrn->display->virtualX;
    else
        width = config->maxWidth;
    if (scrn->display->virtualY && !scrn->is_gpu)
        height = scrn->display->virtualY;
    else
        height = config->maxHeight;

    xf86ProbeOutputModes(scrn, width, height);

    crtcs = xnfcalloc(config->num_output, sizeof(xf86CrtcPtr));
    modes = xnfcalloc(config->num_output, sizeof(DisplayModePtr));
    enabled = xnfcalloc(config->num_output, sizeof(Bool));

    ret = xf86CollectEnabledOutputs(scrn, config, enabled);
    if (ret == FALSE && canGrow) {
        if (!scrn->is_gpu)
            xf86DrvMsg(i, X_WARNING,
		       "Unable to find connected outputs - setting %dx%d "
                       "initial framebuffer\n",
                       NO_OUTPUT_DEFAULT_WIDTH, NO_OUTPUT_DEFAULT_HEIGHT);
        have_outputs = FALSE;
    }
    else {
        if (xf86TargetUserpref(scrn, config, modes, enabled, width, height))
            xf86DrvMsg(i, X_INFO, "Using user preference for initial modes\n");
        else if (xf86TargetRightOf(scrn, config, modes, enabled, width, height))
            xf86DrvMsg(i, X_INFO, "Using spanning desktop for initial modes\n");
        else if (xf86TargetPreferred
                 (scrn, config, modes, enabled, width, height))
            xf86DrvMsg(i, X_INFO, "Using exact sizes for initial modes\n");
        else if (xf86TargetAspect(scrn, config, modes, enabled, width, height))
            xf86DrvMsg(i, X_INFO,
                       "Using fuzzy aspect match for initial modes\n");
        else if (xf86TargetFallback
                 (scrn, config, modes, enabled, width, height))
            xf86DrvMsg(i, X_INFO, "Using sloppy heuristic for initial modes\n");
        else
            xf86DrvMsg(i, X_WARNING, "Unable to find initial modes\n");
    }

    for (o = -1; nextEnabledOutput(config, enabled, &o);) {
        if (!modes[o])
            xf86DrvMsg(scrn->scrnIndex, X_ERROR,
                       "Output %s enabled but has no modes\n",
                       config->output[o]->name);
        else
            xf86DrvMsg (scrn->scrnIndex, X_INFO,
                        "Output %s using initial mode %s +%d+%d\n",
                        config->output[o]->name, modes[o]->name,
                        config->output[o]->initial_x,
                        config->output[o]->initial_y);
    }

    /*
     * Set the position of each output
     */
    if (!xf86InitialOutputPositions(scrn, modes))
        goto bailout;

    /*
     * Set initial panning of each output
     */
    xf86InitialPanning(scrn);

    /*
     * Assign CRTCs to fit output configuration
     */
    if (have_outputs && !xf86PickCrtcs(scrn, crtcs, modes, 0, width, height))
        goto bailout;

    /* XXX override xf86 common frame computation code */

    if (!scrn->is_gpu) {
        scrn->display->frameX0 = 0;
        scrn->display->frameY0 = 0;
    }

    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];

        crtc->enabled = FALSE;
        memset(&crtc->desiredMode, '\0', sizeof(crtc->desiredMode));
    }

    /*
     * Set initial configuration
     */
    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];
        DisplayModePtr mode = modes[o];
        xf86CrtcPtr crtc = crtcs[o];

        if (mode && crtc) {
            xf86SaveModeContents(&crtc->desiredMode, mode);
            crtc->desiredRotation = output->initial_rotation;
            crtc->desiredX = output->initial_x;
            crtc->desiredY = output->initial_y;
            crtc->desiredTransformPresent = FALSE;
            crtc->enabled = TRUE;
            memcpy(&crtc->panningTotalArea, &output->initialTotalArea,
                   sizeof(BoxRec));
            memcpy(&crtc->panningTrackingArea, &output->initialTrackingArea,
                   sizeof(BoxRec));
            memcpy(crtc->panningBorder, output->initialBorder,
                   4 * sizeof(INT16));
            output->crtc = crtc;
        }
        else {
            output->crtc = NULL;
        }
    }

    if (scrn->display->virtualX == 0 || scrn->is_gpu) {
        /*
         * Expand virtual size to cover the current config and potential mode
         * switches, if the driver can't enlarge the screen later.
         */
        xf86DefaultScreenLimits(scrn, &width, &height, canGrow);

        if (have_outputs == FALSE) {
            if (width < NO_OUTPUT_DEFAULT_WIDTH &&
                height < NO_OUTPUT_DEFAULT_HEIGHT) {
                width = NO_OUTPUT_DEFAULT_WIDTH;
                height = NO_OUTPUT_DEFAULT_HEIGHT;
            }
        }

	if (!scrn->is_gpu) {
            scrn->display->virtualX = width;
            scrn->display->virtualY = height;
	}
    }

    if (width > scrn->virtualX)
        scrn->virtualX = width;
    if (height > scrn->virtualY)
        scrn->virtualY = height;

    /*
     * Make sure the configuration isn't too small.
     */
    if (width < config->minWidth || height < config->minHeight)
        goto bailout;

    /*
     * Limit the crtc config to virtual[XY] if the driver can't grow the
     * desktop.
     */
    if (!canGrow) {
        xf86CrtcSetSizeRange(scrn, config->minWidth, config->minHeight,
                             width, height);
    }

    xf86SetScrnInfoModes(scrn);

    success = TRUE;
 bailout:
    free(crtcs);
    free(modes);
    free(enabled);
    return success;
}

/* Turn a CRTC off, using the DPMS function and disabling the cursor */
static void
xf86DisableCrtc(xf86CrtcPtr crtc)
{
    if (xf86CrtcIsLeased(crtc))
        return;

    crtc->funcs->dpms(crtc, DPMSModeOff);
    xf86_crtc_hide_cursor(crtc);
}

/*
 * Check the CRTC we're going to map each output to vs. it's current
 * CRTC.  If they don't match, we have to disable the output and the CRTC
 * since the driver will have to re-route things.
 */
static void
xf86PrepareOutputs(ScrnInfoPtr scrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int o;

    for (o = 0; o < config->num_output; o++) {
        xf86OutputPtr output = config->output[o];

        if (xf86OutputIsLeased(output))
            continue;

#if RANDR_GET_CRTC_INTERFACE
        /* Disable outputs that are unused or will be re-routed */
        if (!output->funcs->get_crtc ||
            output->crtc != (*output->funcs->get_crtc) (output) ||
            output->crtc == NULL)
#endif
            (*output->funcs->dpms) (output, DPMSModeOff);
    }
}

static void
xf86PrepareCrtcs(ScrnInfoPtr scrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int c;

    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];
#if RANDR_GET_CRTC_INTERFACE
        xf86OutputPtr output = NULL;
        uint32_t desired_outputs = 0, current_outputs = 0;
        int o;

        if (xf86CrtcIsLeased(crtc))
            continue;

        for (o = 0; o < config->num_output; o++) {
            output = config->output[o];
            if (output->crtc == crtc)
                desired_outputs |= (1 << o);
            /* If we can't tell where it's mapped, force it off */
            if (!output->funcs->get_crtc) {
                desired_outputs = 0;
                break;
            }
            if ((*output->funcs->get_crtc) (output) == crtc)
                current_outputs |= (1 << o);
        }

        /*
         * If mappings are different or the CRTC is unused,
         * we need to disable it
         */
        if (desired_outputs != current_outputs || !desired_outputs)
            xf86DisableCrtc(crtc);
#else
        if (xf86CrtcIsLeased(crtc))
            continue;

        xf86DisableCrtc(crtc);
#endif
    }
}

/*
 * Using the desired mode information in each crtc, set
 * modes (used in EnterVT functions, or at server startup)
 */

Bool
xf86SetDesiredModes(ScrnInfoPtr scrn)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    xf86CrtcPtr crtc = config->crtc[0];
    int enabled = 0, failed = 0;
    int c;

    /* A driver with this hook will take care of this */
    if (!crtc->funcs->set_mode_major) {
        xf86PrepareOutputs(scrn);
        xf86PrepareCrtcs(scrn);
    }

    for (c = 0; c < config->num_crtc; c++) {
        xf86OutputPtr output = NULL;
        int o;
        RRTransformPtr transform;

        crtc = config->crtc[c];

        /* Skip disabled CRTCs */
        if (!crtc->enabled)
            continue;

        if (xf86CompatOutput(scrn) && xf86CompatCrtc(scrn) == crtc)
            output = xf86CompatOutput(scrn);
        else {
            for (o = 0; o < config->num_output; o++)
                if (config->output[o]->crtc == crtc) {
                    output = config->output[o];
                    break;
                }
        }
        /* paranoia */
        if (!output)
            continue;

        /* Mark that we'll need to re-set the mode for sure */
        memset(&crtc->mode, 0, sizeof(crtc->mode));
        if (!crtc->desiredMode.CrtcHDisplay) {
            DisplayModePtr mode =
                xf86OutputFindClosestMode(output, scrn->currentMode);

            if (!mode)
                return FALSE;
            xf86SaveModeContents(&crtc->desiredMode, mode);
            crtc->desiredRotation = RR_Rotate_0;
            crtc->desiredTransformPresent = FALSE;
            crtc->desiredX = 0;
            crtc->desiredY = 0;
        }

        if (crtc->desiredTransformPresent)
            transform = &crtc->desiredTransform;
        else
            transform = NULL;
        if (xf86CrtcSetModeTransform
            (crtc, &crtc->desiredMode, crtc->desiredRotation, transform,
             crtc->desiredX, crtc->desiredY)) {
            ++enabled;
        } else {
            for (o = 0; o < config->num_output; o++)
                if (config->output[o]->crtc == crtc)
                    config->output[o]->crtc = NULL;
            crtc->enabled = FALSE;
            ++failed;
	}
    }

    xf86DisableUnusedFunctions(scrn);
    return enabled != 0 || failed == 0;
}

/**
 * In the current world order, there are lists of modes per output, which may
 * or may not include the mode that was asked to be set by XFree86's mode
 * selection.  Find the closest one, in the following preference order:
 *
 * - Equality
 * - Closer in size to the requested mode, but no larger
 * - Closer in refresh rate to the requested mode.
 */

DisplayModePtr
xf86OutputFindClosestMode(xf86OutputPtr output, DisplayModePtr desired)
{
    DisplayModePtr best = NULL, scan = NULL;

    for (scan = output->probed_modes; scan != NULL; scan = scan->next) {
        /* If there's an exact match, we're done. */
        if (xf86ModesEqual(scan, desired)) {
            best = desired;
            break;
        }

        /* Reject if it's larger than the desired mode. */
        if (scan->HDisplay > desired->HDisplay ||
            scan->VDisplay > desired->VDisplay) {
            continue;
        }

        /*
         * If we haven't picked a best mode yet, use the first
         * one in the size range
         */
        if (best == NULL) {
            best = scan;
            continue;
        }

        /* Find if it's closer to the right size than the current best
         * option.
         */
        if ((scan->HDisplay > best->HDisplay &&
             scan->VDisplay >= best->VDisplay) ||
            (scan->HDisplay >= best->HDisplay &&
             scan->VDisplay > best->VDisplay)) {
            best = scan;
            continue;
        }

        /* Find if it's still closer to the right refresh than the current
         * best resolution.
         */
        if (scan->HDisplay == best->HDisplay &&
            scan->VDisplay == best->VDisplay &&
            (fabs(scan->VRefresh - desired->VRefresh) <
             fabs(best->VRefresh - desired->VRefresh))) {
            best = scan;
        }
    }
    return best;
}

/**
 * When setting a mode through XFree86-VidModeExtension or XFree86-DGA,
 * take the specified mode and apply it to the crtc connected to the compat
 * output. Then, find similar modes for the other outputs, as with the
 * InitialConfiguration code above. The goal is to clone the desired
 * mode across all outputs that are currently active.
 */

Bool
xf86SetSingleMode(ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
    Bool ok = TRUE;
    xf86OutputPtr compat_output;
    DisplayModePtr compat_mode = NULL;
    int c;

    /*
     * Let the compat output drive the final mode selection
     */
    compat_output = xf86CompatOutput(pScrn);
    if (compat_output)
        compat_mode = xf86OutputFindClosestMode(compat_output, desired);
    if (compat_mode)
        desired = compat_mode;

    for (c = 0; c < config->num_crtc; c++) {
        xf86CrtcPtr crtc = config->crtc[c];
        DisplayModePtr crtc_mode = NULL;
        int o;

        if (!crtc->enabled)
            continue;

        for (o = 0; o < config->num_output; o++) {
            xf86OutputPtr output = config->output[o];
            DisplayModePtr output_mode;

            /* skip outputs not on this crtc */
            if (output->crtc != crtc)
                continue;

            if (crtc_mode) {
                output_mode = xf86OutputFindClosestMode(output, crtc_mode);
                if (output_mode != crtc_mode)
                    output->crtc = NULL;
            }
            else
                crtc_mode = xf86OutputFindClosestMode(output, desired);
        }
        if (!crtc_mode) {
            crtc->enabled = FALSE;
            continue;
        }
        if (!xf86CrtcSetModeTransform(crtc, crtc_mode, rotation, NULL, 0, 0))
            ok = FALSE;
        else {
            xf86SaveModeContents(&crtc->desiredMode, crtc_mode);
            crtc->desiredRotation = rotation;
            crtc->desiredTransformPresent = FALSE;
            crtc->desiredX = 0;
            crtc->desiredY = 0;
        }
    }
    xf86DisableUnusedFunctions(pScrn);
#ifdef RANDR_12_INTERFACE
    xf86RandR12TellChanged(pScrn->pScreen);
#endif
    return ok;
}

/**
 * Set the DPMS power mode of all outputs and CRTCs.
 *
 * If the new mode is off, it will turn off outputs and then CRTCs.
 * Otherwise, it will affect CRTCs before outputs.
 */
void
xf86DPMSSet(ScrnInfoPtr scrn, int mode, int flags)
{
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    int i;

    if (!scrn->vtSema)
        return;

    if (mode == DPMSModeOff) {
        for (i = 0; i < config->num_output; i++) {
            xf86OutputPtr output = config->output[i];

            if (!xf86OutputIsLeased(output) && output->crtc != NULL)
                (*output->funcs->dpms) (output, mode);
        }
    }

    for (i = 0; i < config->num_crtc; i++) {
        xf86CrtcPtr crtc = config->crtc[i];

        if (crtc->enabled)
            (*crtc->funcs->dpms) (crtc, mode);
    }

    if (mode != DPMSModeOff) {
        for (i = 0; i < config->num_output; i++) {
            xf86OutputPtr output = config->output[i];

            if (!xf86OutputIsLeased(output) && output->crtc != NULL)
                (*output->funcs->dpms) (output, mode);
        }
    }
}

/**
 * Implement the screensaver by just calling down into the driver DPMS hooks.
 *
 * Even for monitors with no DPMS support, by the definition of our DPMS hooks,
 * the outputs will still get disabled (blanked).
 */
Bool
xf86SaveScreen(ScreenPtr pScreen, int mode)
{
    ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);

    if (xf86IsUnblank(mode))
        xf86DPMSSet(pScrn, DPMSModeOn, 0);
    else
        xf86DPMSSet(pScrn, DPMSModeOff, 0);

    return TRUE;
}

/**
 * Disable all inactive crtcs and outputs
 */
void
xf86DisableUnusedFunctions(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    int o, c;

    for (o = 0; o < xf86_config->num_output; o++) {
        xf86OutputPtr output = xf86_config->output[o];

        if (!output->crtc)
            (*output->funcs->dpms) (output, DPMSModeOff);
    }

    for (c = 0; c < xf86_config->num_crtc; c++) {
        xf86CrtcPtr crtc = xf86_config->crtc[c];

        if (!crtc->enabled) {
            xf86DisableCrtc(crtc);
            memset(&crtc->mode, 0, sizeof(crtc->mode));
            xf86RotateDestroy(crtc);
            crtc->active = FALSE;
        }
    }
    if (pScrn->pScreen)
        xf86_crtc_notify(pScrn->pScreen);
    if (pScrn->ModeSet)
        pScrn->ModeSet(pScrn);
    if (pScrn->pScreen) {
        if (pScrn->pScreen->isGPU)
            xf86CursorResetCursor(pScrn->pScreen->current_master);
        else
            xf86CursorResetCursor(pScrn->pScreen);
    }
}

#ifdef RANDR_12_INTERFACE

#define EDID_ATOM_NAME		"EDID"

/**
 * Set the RandR EDID property
 */
static void
xf86OutputSetEDIDProperty(xf86OutputPtr output, void *data, int data_len)
{
    Atom edid_atom = MakeAtom(EDID_ATOM_NAME, sizeof(EDID_ATOM_NAME) - 1, TRUE);

    /* This may get called before the RandR resources have been created */
    if (output->randr_output == NULL)
        return;

    if (data_len != 0) {
        RRChangeOutputProperty(output->randr_output, edid_atom, XA_INTEGER, 8,
                               PropModeReplace, data_len, data, FALSE, TRUE);
    }
    else {
        RRDeleteOutputProperty(output->randr_output, edid_atom);
    }
}

#define TILE_ATOM_NAME		"TILE"
/* changing this in the future could be tricky as people may hardcode 8 */
#define TILE_PROP_NUM_ITEMS		8
static void
xf86OutputSetTileProperty(xf86OutputPtr output)
{
    Atom tile_atom = MakeAtom(TILE_ATOM_NAME, sizeof(TILE_ATOM_NAME) - 1, TRUE);

    /* This may get called before the RandR resources have been created */
    if (output->randr_output == NULL)
        return;

    if (output->tile_info.group_id != 0) {
        RRChangeOutputProperty(output->randr_output, tile_atom, XA_INTEGER, 32,
                               PropModeReplace, TILE_PROP_NUM_ITEMS, (uint32_t *)&output->tile_info, FALSE, TRUE);
    }
    else {
        RRDeleteOutputProperty(output->randr_output, tile_atom);
    }
}

#endif

/* Pull out a phyiscal size from a detailed timing if available. */
struct det_phySize_parameter {
    xf86OutputPtr output;
    ddc_quirk_t quirks;
    Bool ret;
};

static void
handle_detailed_physical_size(struct detailed_monitor_section
                              *det_mon, void *data)
{
    struct det_phySize_parameter *p;

    p = (struct det_phySize_parameter *) data;

    if (p->ret == TRUE)
        return;

    xf86DetTimingApplyQuirks(det_mon, p->quirks,
                             p->output->MonInfo->features.hsize,
                             p->output->MonInfo->features.vsize);
    if (det_mon->type == DT &&
        det_mon->section.d_timings.h_size != 0 &&
        det_mon->section.d_timings.v_size != 0) {
        /* some sanity checking for aspect ratio:
           assume any h / v (or v / h) > 2.4 to be bogus.
           This would even include cinemascope */
        if (((det_mon->section.d_timings.h_size * 5) <
             (det_mon->section.d_timings.v_size * 12)) &&
            ((det_mon->section.d_timings.v_size * 5) <
             (det_mon->section.d_timings.h_size * 12))) {
            p->output->mm_width = det_mon->section.d_timings.h_size;
            p->output->mm_height = det_mon->section.d_timings.v_size;
            p->ret = TRUE;
        } else
            xf86DrvMsg(p->output->scrn->scrnIndex, X_WARNING,
                       "Output %s: Strange aspect ratio (%i/%i), "
                       "consider adding a quirk\n", p->output->name,
                       det_mon->section.d_timings.h_size,
                       det_mon->section.d_timings.v_size);
    }
}

Bool
xf86OutputParseKMSTile(const char *tile_data, int tile_length,
                       struct xf86CrtcTileInfo *tile_info)
{
    int ret;

    ret = sscanf(tile_data, "%d:%d:%d:%d:%d:%d:%d:%d",
                 &tile_info->group_id,
                 &tile_info->flags,
                 &tile_info->num_h_tile,
                 &tile_info->num_v_tile,
                 &tile_info->tile_h_loc,
                 &tile_info->tile_v_loc,
                 &tile_info->tile_h_size,
                 &tile_info->tile_v_size);
    if (ret != 8)
        return FALSE;
    return TRUE;
}

void
xf86OutputSetTile(xf86OutputPtr output, struct xf86CrtcTileInfo *tile_info)
{
    if (tile_info)
        output->tile_info = *tile_info;
    else
        memset(&output->tile_info, 0, sizeof(output->tile_info));
#ifdef RANDR_12_INTERFACE
    xf86OutputSetTileProperty(output);
#endif
}

/**
 * Set the EDID information for the specified output
 */
void
xf86OutputSetEDID(xf86OutputPtr output, xf86MonPtr edid_mon)
{
    ScrnInfoPtr scrn = output->scrn;
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
    Bool debug_modes = config->debug_modes || xf86Initialising;

#ifdef RANDR_12_INTERFACE
    int size;
#endif

    free(output->MonInfo);

    output->MonInfo = edid_mon;
    output->mm_width = 0;
    output->mm_height = 0;

    if (debug_modes) {
        xf86DrvMsg(scrn->scrnIndex, X_INFO, "EDID for output %s\n",
                   output->name);
        xf86PrintEDID(edid_mon);
    }

    /* Set the DDC properties for the 'compat' output */
    /* GPU screens don't have a root window */
    if (output == xf86CompatOutput(scrn) && !scrn->is_gpu)
        xf86SetDDCproperties(scrn, edid_mon);

#ifdef RANDR_12_INTERFACE
    /* Set the RandR output properties */
    size = 0;
    if (edid_mon) {
        if (edid_mon->ver.version == 1) {
            size = 128;
            if (edid_mon->flags & EDID_COMPLETE_RAWDATA)
                size += edid_mon->no_sections * 128;
        }
        else if (edid_mon->ver.version == 2)
            size = 256;
    }
    xf86OutputSetEDIDProperty(output, edid_mon ? edid_mon->rawData : NULL,
                              size);
#endif

    if (edid_mon) {

        struct det_phySize_parameter p;

        p.output = output;
        p.quirks = xf86DDCDetectQuirks(scrn->scrnIndex, edid_mon, FALSE);
        p.ret = FALSE;
        xf86ForEachDetailedBlock(edid_mon, handle_detailed_physical_size, &p);

        /* if no mm size is available from a detailed timing, check the max size field */
        if ((!output->mm_width || !output->mm_height) &&
            (edid_mon->features.hsize && edid_mon->features.vsize)) {
            output->mm_width = edid_mon->features.hsize * 10;
            output->mm_height = edid_mon->features.vsize * 10;
        }
    }
}

/**
 * Return the list of modes supported by the EDID information
 * stored in 'output'
 */
DisplayModePtr
xf86OutputGetEDIDModes(xf86OutputPtr output)
{
    ScrnInfoPtr scrn = output->scrn;
    xf86MonPtr edid_mon = output->MonInfo;

    if (!edid_mon)
        return NULL;
    return xf86DDCGetModes(scrn->scrnIndex, edid_mon);
}

/* maybe we should care about DDC1?  meh. */
xf86MonPtr
xf86OutputGetEDID(xf86OutputPtr output, I2CBusPtr pDDCBus)
{
    ScrnInfoPtr scrn = output->scrn;
    xf86MonPtr mon;

    mon = xf86DoEEDID(scrn, pDDCBus, TRUE);
    if (mon)
        xf86DDCApplyQuirks(scrn->scrnIndex, mon);

    return mon;
}

static const char *_xf86ConnectorNames[] = {
    "None", "VGA", "DVI-I", "DVI-D",
    "DVI-A", "Composite", "S-Video",
    "Component", "LFP", "Proprietary",
    "HDMI", "DisplayPort",
};

const char *
xf86ConnectorGetName(xf86ConnectorType connector)
{
    return _xf86ConnectorNames[connector];
}

#ifdef XV
static void
x86_crtc_box_intersect(BoxPtr dest, BoxPtr a, BoxPtr b)
{
    dest->x1 = a->x1 > b->x1 ? a->x1 : b->x1;
    dest->x2 = a->x2 < b->x2 ? a->x2 : b->x2;
    dest->y1 = a->y1 > b->y1 ? a->y1 : b->y1;
    dest->y2 = a->y2 < b->y2 ? a->y2 : b->y2;

    if (dest->x1 >= dest->x2 || dest->y1 >= dest->y2)
        dest->x1 = dest->x2 = dest->y1 = dest->y2 = 0;
}

static void
x86_crtc_box(xf86CrtcPtr crtc, BoxPtr crtc_box)
{
    if (crtc->enabled) {
        crtc_box->x1 = crtc->x;
        crtc_box->x2 = crtc->x + xf86ModeWidth(&crtc->mode, crtc->rotation);
        crtc_box->y1 = crtc->y;
        crtc_box->y2 = crtc->y + xf86ModeHeight(&crtc->mode, crtc->rotation);
    }
    else
        crtc_box->x1 = crtc_box->x2 = crtc_box->y1 = crtc_box->y2 = 0;
}

static int
xf86_crtc_box_area(BoxPtr box)
{
    return (int) (box->x2 - box->x1) * (int) (box->y2 - box->y1);
}

/*
 * Return the crtc covering 'box'. If two crtcs cover a portion of
 * 'box', then prefer 'desired'. If 'desired' is NULL, then prefer the crtc
 * with greater coverage
 */

static xf86CrtcPtr
xf86_covering_crtc(ScrnInfoPtr pScrn,
                   BoxPtr box, xf86CrtcPtr desired, BoxPtr crtc_box_ret)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    xf86CrtcPtr crtc, best_crtc;
    int coverage, best_coverage;
    int c;
    BoxRec crtc_box, cover_box;

    best_crtc = NULL;
    best_coverage = 0;
    crtc_box_ret->x1 = 0;
    crtc_box_ret->x2 = 0;
    crtc_box_ret->y1 = 0;
    crtc_box_ret->y2 = 0;
    for (c = 0; c < xf86_config->num_crtc; c++) {
        crtc = xf86_config->crtc[c];
        x86_crtc_box(crtc, &crtc_box);
        x86_crtc_box_intersect(&cover_box, &crtc_box, box);
        coverage = xf86_crtc_box_area(&cover_box);
        if (coverage && crtc == desired) {
            *crtc_box_ret = crtc_box;
            return crtc;
        }
        else if (coverage > best_coverage) {
            *crtc_box_ret = crtc_box;
            best_crtc = crtc;
            best_coverage = coverage;
        }
    }
    return best_crtc;
}

/*
 * For overlay video, compute the relevant CRTC and
 * clip video to that.
 *
 * returning FALSE means there was a memory failure of some kind,
 * not that the video shouldn't be displayed
 */

Bool
xf86_crtc_clip_video_helper(ScrnInfoPtr pScrn,
                            xf86CrtcPtr * crtc_ret,
                            xf86CrtcPtr desired_crtc,
                            BoxPtr dst,
                            INT32 *xa,
                            INT32 *xb,
                            INT32 *ya,
                            INT32 *yb, RegionPtr reg, INT32 width, INT32 height)
{
    Bool ret;
    RegionRec crtc_region_local;
    RegionPtr crtc_region = reg;

    if (crtc_ret) {
        BoxRec crtc_box;
        xf86CrtcPtr crtc = xf86_covering_crtc(pScrn, dst,
                                              desired_crtc,
                                              &crtc_box);

        if (crtc) {
            RegionInit(&crtc_region_local, &crtc_box, 1);
            crtc_region = &crtc_region_local;
            RegionIntersect(crtc_region, crtc_region, reg);
        }
        *crtc_ret = crtc;
    }

    ret = xf86XVClipVideoHelper(dst, xa, xb, ya, yb,
                                crtc_region, width, height);

    if (crtc_region != reg)
        RegionUninit(&crtc_region_local);

    return ret;
}
#endif

xf86_crtc_notify_proc_ptr
xf86_wrap_crtc_notify(ScreenPtr screen, xf86_crtc_notify_proc_ptr new)
{
    if (xf86CrtcConfigPrivateIndex != -1) {
        ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
        xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);
        xf86_crtc_notify_proc_ptr old;

        old = config->xf86_crtc_notify;
        config->xf86_crtc_notify = new;
        return old;
    }
    return NULL;
}

void
xf86_unwrap_crtc_notify(ScreenPtr screen, xf86_crtc_notify_proc_ptr old)
{
    if (xf86CrtcConfigPrivateIndex != -1) {
        ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
        xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);

        config->xf86_crtc_notify = old;
    }
}

void
xf86_crtc_notify(ScreenPtr screen)
{
    ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
    xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(scrn);

    if (config->xf86_crtc_notify)
        config->xf86_crtc_notify(screen);
}

Bool
xf86_crtc_supports_gamma(ScrnInfoPtr pScrn)
{
    if (xf86CrtcConfigPrivateIndex != -1) {
        xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
        xf86CrtcPtr crtc;

        /* for multiple drivers loaded we need this */
        if (!xf86_config)
            return FALSE;
        if (xf86_config->num_crtc == 0)
            return FALSE;
        crtc = xf86_config->crtc[0];

        return crtc->funcs->gamma_set != NULL;
    }

    return FALSE;
}

void
xf86ProviderSetup(ScrnInfoPtr scrn,
                  const xf86ProviderFuncsRec *funcs, const char *name)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);

    assert(!xf86_config->name);
    assert(name);

    xf86_config->name = strdup(name);
    xf86_config->provider_funcs = funcs;
#ifdef RANDR_12_INTERFACE
    xf86_config->randr_provider = NULL;
#endif
}

void
xf86DetachAllCrtc(ScrnInfoPtr scrn)
{
        xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
        int i;

        for (i = 0; i < xf86_config->num_crtc; i++) {
            xf86CrtcPtr crtc = xf86_config->crtc[i];

            if (crtc->randr_crtc)
                RRCrtcDetachScanoutPixmap(crtc->randr_crtc);

            /* dpms off */
            xf86DisableCrtc(crtc);
            /* force a reset the next time its used */
            crtc->randr_crtc->mode = NULL;
            crtc->mode.HDisplay = 0;
            crtc->x = crtc->y = 0;
        }
}