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xf86Crtc.c

/*
 * 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>
#else
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#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"
#define DPMS_SERVER
#include "X11/extensions/dpms.h"
#include "X11/Xatom.h"
#ifdef RENDER
#include "picturestr.h"
#endif

#include "xf86xv.h"

/*
 * 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;

    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 = xcalloc (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 = malloc(3 * crtc->gamma_size * sizeof (CARD16));
    if (!crtc->gamma_red) {
      xfree (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 = xrealloc (xf86_config->crtc,
                    (xf86_config->num_crtc + 1) * sizeof (xf86CrtcPtr));
    else
      crtcs = xalloc ((xf86_config->num_crtc + 1) * sizeof (xf86CrtcPtr));
    if (!crtcs)
    {
      xfree (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;
      }
    if (crtc->params)
      xfree (crtc->params);
    free(crtc->gamma_red);
    xfree (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;
}

void
xf86CrtcSetScreenSubpixelOrder (ScreenPtr pScreen)
{
#ifdef RENDER
    int                 subpixel_order = SubPixelUnknown;
    Bool          has_none = FALSE;
    ScrnInfoPtr         scrn = xf86Screens[pScreen->myNum];
    xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
    int                 c, o;

    for (c = 0; c < xf86_config->num_crtc; c++)
    {
      xf86CrtcPtr crtc = xf86_config->crtc[c];
      
      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 c;
          for (rotate = 0; rotate < 4; rotate++)
            if (crtc->rotation & (1 << rotate))
                break;
          for (c = 0; c < 4; c++)
            if (circle[c] == subpixel_order)
                break;
          c = (c + rotate) & 0x3;
          if ((crtc->rotation & RR_Reflect_X) && !(c & 1))
            c ^= 2;
          if ((crtc->rotation & RR_Reflect_Y) && (c & 1))
            c ^= 2;
          subpixel_order = circle[c];
          break;
      }
    }
    if (subpixel_order == SubPixelUnknown && has_none)
      subpixel_order = SubPixelNone;
    PictureSetSubpixelOrder (pScreen, subpixel_order);
#endif
}

/**
 * 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;

    if (crtc->funcs->set_mode_major)
      return crtc->funcs->set_mode_major(crtc, mode, rotation, x, y);

    crtc->enabled = xf86CrtcInUse (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);

    didLock = crtc->funcs->lock (crtc);

    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;

    /* Shift offsets that move us out of virtual size */
    if (x + mode->HDisplay > xf86_config->maxWidth ||
      y + mode->VDisplay > xf86_config->maxHeight)
    {
      if (x + mode->HDisplay > xf86_config->maxWidth)
          crtc->x = xf86_config->maxWidth - mode->HDisplay;
      if (y + mode->VDisplay > xf86_config->maxHeight)
          crtc->y = xf86_config->maxHeight - mode->VDisplay;
      if (crtc->x < 0 || crtc->y < 0)
      {
          xf86DrvMsg (scrn->scrnIndex, X_ERROR,
                  "Mode %dx%d does not fit virtual size %dx%d - "
                  "internal error\n", mode->HDisplay, mode->VDisplay,
                  xf86_config->maxWidth, xf86_config->maxHeight);
          goto done;
      }
      xf86DrvMsg (scrn->scrnIndex, X_ERROR,
                "Mode %dx%d+%d+%d does not fit virtual size %dx%d - "
                "offset updated to +%d+%d\n",
                mode->HDisplay, mode->VDisplay, x, y,
                xf86_config->maxWidth, xf86_config->maxHeight,
                crtc->x, crtc->y);
    }

    if (crtc->funcs->set_origin &&
      memcmp (mode, &saved_mode, sizeof(saved_mode)) == 0 &&
      saved_rotation == rotation) {
      crtc->funcs->set_origin (crtc, crtc->x, crtc->y);
      ret = TRUE;
      goto done;
    }

    /* 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, 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;
    crtc->active = TRUE;
    if (scrn->pScreen)
      xf86CrtcSetScreenSubpixelOrder (scrn->pScreen);

done:
    if (!ret) {
      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(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)
{
    crtc->x = x;
    crtc->y = y;
    if (crtc->funcs->set_origin)
      crtc->funcs->set_origin (crtc, x, y);
    else
      xf86CrtcSetMode (crtc, &crtc->mode, crtc->rotation, x, y);
}

/*
 * Output functions
 */

extern XF86ConfigPtr xf86configptr;

typedef enum {
    OPTION_PREFERRED_MODE,
    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,
} OutputOpts;

static OptionInfoRec xf86OutputOptions[] = {
    {OPTION_PREFERRED_MODE, "PreferredMode",    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 },
    {-1,              NULL,         OPTV_NONE,    {0}, FALSE },
};

enum {
    OPTION_MODEDEBUG,
};

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

static void
xf86OutputSetMonitor (xf86OutputPtr output)
{
    char    *option_name;
    static const char monitor_prefix[] = "monitor-";
    char    *monitor;

    if (!output->name)
      return;

    if (output->options)
      xfree (output->options);

    output->options = xnfalloc (sizeof (xf86OutputOptions));
    memcpy (output->options, xf86OutputOptions, sizeof (xf86OutputOptions));
    
    option_name = xnfalloc (strlen (monitor_prefix) +
                      strlen (output->name) + 1);
    strcpy (option_name, monitor_prefix);
    strcat (option_name, output->name);
    monitor = xf86findOptionValue (output->scrn->options, option_name);
    if (!monitor)
      monitor = output->name;
    else
      xf86MarkOptionUsedByName (output->scrn->options, option_name);
    xfree (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 */
    if (strict) {
      enable = output->status == XF86OutputStatusConnected;
    }
    /* 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 char *direction[4] = {
    "normal", 
    "left", 
    "inverted", 
    "right"
};

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

    if (!rotate_name)
      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;

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

    output = xcalloc (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))
      {
          xfree (output);
          return FALSE;
      }
    }
    
    
    if (xf86_config->output)
      outputs = xrealloc (xf86_config->output,
                    (xf86_config->num_output + 1) * sizeof (xf86OutputPtr));
    else
      outputs = xalloc ((xf86_config->num_output + 1) * sizeof (xf86OutputPtr));
    if (!outputs)
    {
      xfree (output);
      return NULL;
    }
    
    xf86_config->output = outputs;
    xf86_config->output[xf86_config->num_output++] = output;
    
    return output;
}

Bool
xf86OutputRename (xf86OutputPtr output, const char *name)
{
    int         len = strlen(name) + 1;
    char    *newname = xalloc (len);
    
    if (!newname)
      return FALSE;     /* so sorry... */
    
    strcpy (newname, name);
    if (output->name && output->name != (char *) (output + 1))
      xfree (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))
      xfree (output->name);
    xfree (output);
}

/*
 * Called during CreateScreenResources to hook up RandR
 */
static Bool
xf86CrtcCreateScreenResources (ScreenPtr screen)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    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 (int index, ScreenPtr screen)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(scrn);
    int                 o, c;
    
    screen->CloseScreen = config->CloseScreen;

    xf86RotateCloseScreen (screen);

    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;
    }
    return screen->CloseScreen (index, screen);
}

/*
 * Called at ScreenInit time to set up
 */
#ifdef RANDR_13_INTERFACE
int
#else
Bool
#endif
xf86CrtcScreenInit (ScreenPtr screen)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(scrn);
    int                 c;

    /* Rotation */
    xf86DrvMsg(scrn->scrnIndex, X_INFO, "RandR 1.2 enabled, ignore the following RandR disabled message.\n");
    xf86DisableRandR(); /* Disable old RandR extension support */
    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;
    
#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;
    xf86CrtcPtr       best_crtc;
    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_crtc = NULL;
    best_score = xf86PickCrtcs (scrn, best_crtcs, modes, n+1, width, height);
    if (modes[n] == NULL)
      return best_score;
    
    crtcs = xalloc (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_crtc = crtc;
          best_score = score;
          memcpy (best_crtcs, crtcs, config->num_output * sizeof (xf86CrtcPtr));
      }
    }
    xfree (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->x + xf86ModeWidth (&crtc->desiredMode, crtc->desiredRotation);
          crtc_height = crtc->y + 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];
      char      *position;
      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;
    
    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;
          char        *relative_name;
          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];
      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);
      }
    }
}

/*
 * XXX walk the monitor mode list and prune out duplicates that
 * are inserted by xf86DDCMonitorSet. In an ideal world, that
 * function would do this work by itself.
 */

static void
xf86PruneDuplicateMonitorModes (MonPtr Monitor)
{
    DisplayModePtr  master, clone, next;

    for (master = Monitor->Modes; 
       master && master != Monitor->Last; 
       master = master->next)
    {
      for (clone = master->next; clone && clone != Monitor->Modes; clone = next)
      {
          next = clone->next;
          if (xf86ModesEqual (master, clone))
          {
            if (Monitor->Last == clone)
                Monitor->Last = clone->prev;
            xf86DeleteMode (&Monitor->Modes, clone);
          }
      }
    }
}

/** 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;
          xfree (n->name);
          xfree (n);
          n = o;
      }
    }
    /* hook up backward links */
    prev = NULL;
    for (o = output; o; o = o->next)
    {
      o->prev = prev;
      prev = o;
    }
    return output;
}

static char *
preferredMode(ScrnInfoPtr pScrn, xf86OutputPtr output)
{
    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;
}

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;
}

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;
    }

    /* Elide duplicate modes before defaulting code uses them */
    xf86PruneDuplicateMonitorModes (scrn->monitor);
    
    /* 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;
      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 = TRUE;
      enum { sync_config, sync_edid, sync_default } 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)
      {
          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);
      
      edid_monitor = output->MonInfo;
      
      if (edid_monitor)
      {
          int                     i;
          Bool              set_hsync = mon_rec.nHsync == 0;
          Bool              set_vrefresh = mon_rec.nVrefresh == 0;
          struct disp_features    *features = &edid_monitor->features;

          /* if display is not continuous-frequency, don't add default modes */
          if (!GTF_SUPPORTED(features->msc))
            add_default_modes = FALSE;

          for (i = 0; i < sizeof (edid_monitor->det_mon) / sizeof (edid_monitor->det_mon[0]); i++)
          {
            if (edid_monitor->det_mon[i].type == DS_RANGES)
            {
                struct monitor_ranges   *ranges = &edid_monitor->det_mon[i].section.ranges;
                if (set_hsync && ranges->max_h)
                {
                  mon_rec.hsync[mon_rec.nHsync].lo = ranges->min_h;
                  mon_rec.hsync[mon_rec.nHsync].hi = ranges->max_h;
                  mon_rec.nHsync++;
                  if (sync_source == sync_default)
                      sync_source = sync_edid;
                }
                if (set_vrefresh && ranges->max_v)
                {
                  mon_rec.vrefresh[mon_rec.nVrefresh].lo = ranges->min_v;
                  mon_rec.vrefresh[mon_rec.nVrefresh].hi = ranges->max_v;
                  mon_rec.nVrefresh++;
                  if (sync_source == sync_default)
                      sync_source = sync_edid;
                }
                if (ranges->max_clock * 1000 > max_clock)
                  max_clock = ranges->max_clock * 1000;
            }
          }
      }

      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 (output->interlaceAllowed,
                                     output->doubleScanAllowed);

      /*
       * 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
       */
      if (maxX && maxY)
          xf86ValidateModesSize (scrn, output->probed_modes,
                               maxX, maxY, 0);
       
      /*
       * 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,
                        config->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;
            }
          }
      }
      
      output->initial_rotation = xf86OutputInitialRotation (output);

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


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

/* XXX where does this function belong? Here? */
void
xf86RandR12GetOriginalVirtualSize(ScrnInfoPtr scrn, int *x, int *y);

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;

    /* 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 {
      /* Don't change the compat output when no valid outputs found */
      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 != NULL) {
      /* 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;
}

static void
xf86EnableOutputs(ScrnInfoPtr scrn, xf86CrtcConfigPtr config, Bool *enabled)
{
    Bool any_enabled = FALSE;
    int o;

    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++)
          enabled[o] = xf86OutputEnabled(config->output[o], FALSE);
    }
}

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 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;

            for (mode = output->probed_modes; mode; mode = mode->next) {
                Rotation r = output->initial_rotation;
                if (xf86ModeWidth(mode, r) == pref_width &&
                      xf86ModeHeight(mode, r) == 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, assuming one exists.
     */
    if (!ret) do {
      int i = 0;
      float aspect = 0.0;

      /* count the number of enabled outputs */
      for (i = 0, p = -1; nextEnabledOutput(config, enabled, &p); i++) ;

      if (i != 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;

      if (aspect)
          preferred_match[0] = bestModeForAspect(config, enabled, aspect);

      if (preferred_match[0])
          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));
    }

    xfree(preferred);
    xfree(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:
    xfree(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;
}

static Bool
xf86CrtcSetInitialGamma(xf86CrtcPtr crtc, float gamma_red, float gamma_green,
        float gamma_blue)
{
    int i, size = 256;
    CARD16 *red, *green, *blue;

    red = malloc(3 * size * sizeof(CARD16));
    green = red + size;
    blue = green + size;

     /* Only cause warning if user wanted gamma to be set. */
    if (!crtc->funcs->gamma_set && (gamma_red != 1.0 || gamma_green != 1.0 || gamma_blue != 1.0))
        return FALSE;
    else if (!crtc->funcs->gamma_set)
        return TRUE;

    /* At this early stage none of the randr-interface stuff is up.
     * So take the default gamma size for lack of something better.
     */
    for (i = 0; i < size; i++) {
        if (gamma_red == 1.0)
            red[i] = i << 8;
        else
            red[i] = (CARD16)(pow((double)i/(double)(size - 1),
                  (double)gamma_red) * (double)(size - 1) * 256);

        if (gamma_green == 1.0)
            green[i] = i << 8;
        else
            green[i] = (CARD16)(pow((double)i/(double)(size - 1),
                  (double)gamma_green) * (double)(size - 1) * 256);

        if (gamma_blue == 1.0)
            blue[i] = i << 8;
        else
            blue[i] = (CARD16)(pow((double)i/(double)(size - 1),
                  (double)gamma_blue) * (double)(size - 1) * 256);
    }

    /* Default size is 256, so anything else is failure. */
    if (size != crtc->gamma_size)
        return FALSE;

    crtc->gamma_size = size;
    memcpy (crtc->gamma_red, red, crtc->gamma_size * sizeof (CARD16));
    memcpy (crtc->gamma_green, green, crtc->gamma_size * sizeof (CARD16));
    memcpy (crtc->gamma_blue, blue, crtc->gamma_size * sizeof (CARD16));

    /* Do not set gamma now, delay until the crtc is activated. */

    free(red);

    return TRUE;
}

static Bool
xf86OutputSetInitialGamma(xf86OutputPtr output)
{
    XF86ConfMonitorPtr mon = output->conf_monitor;
    float gamma_red = 1.0, gamma_green = 1.0, gamma_blue = 1.0;
    
    if (!mon)
        return TRUE;

    if (!output->crtc)
        return FALSE;

    /* Get configured values, where they exist. */
    if (mon->mon_gamma_red >= GAMMA_MIN &&
        mon->mon_gamma_red <= GAMMA_MAX)
            gamma_red = mon->mon_gamma_red;

    if (mon->mon_gamma_green >= GAMMA_MIN &&
        mon->mon_gamma_green <= GAMMA_MAX)
            gamma_green = mon->mon_gamma_green;

    if (mon->mon_gamma_blue >= GAMMA_MIN &&
        mon->mon_gamma_blue <= GAMMA_MAX)
            gamma_blue = mon->mon_gamma_blue;

    /* This avoids setting gamma 1.0 in case another cloned output on this crtc has a specific gamma. */
    if (gamma_red != 1.0 || gamma_green != 1.0 || gamma_blue != 1.0) {
      xf86DrvMsg(output->scrn->scrnIndex, X_INFO, "Output %s wants gamma correction (%.1f, %.1f, %.1f)\n", output->name, gamma_red, gamma_green, gamma_blue);
      return xf86CrtcSetInitialGamma(output->crtc, gamma_red, gamma_green, gamma_blue);
    }else
      return TRUE;
}

/**
 * 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;

    /* 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)
      width = scrn->display->virtualX;
    else
      width = config->maxWidth;
    if (scrn->display->virtualY)
      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));
    
    xf86EnableOutputs(scrn, config, enabled);

    if (xf86TargetUserpref(scrn, config, modes, enabled, width, height))
      xf86DrvMsg(i, X_INFO, "Using user preference 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\n",
                  config->output[o]->name, modes[o]->name);
    }

    /*
     * Set the position of each output
     */
    if (!xf86InitialOutputPositions (scrn, modes))
    {
      xfree (crtcs);
      xfree (modes);
      return FALSE;
    }

    /*
     * Set initial panning of each output
     */
    xf86InitialPanning (scrn);
      
    /*
     * Assign CRTCs to fit output configuration
     */
    if (!xf86PickCrtcs (scrn, crtcs, modes, 0, width, height))
    {
      xfree (crtcs);
      xfree (modes);
      return FALSE;
    }
    
    /* XXX override xf86 common frame computation code */
    
    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 default gamma for all crtc's. */
      /* This is done to avoid problems later on with cloned outputs. */
      xf86CrtcSetInitialGamma(crtc, 1.0, 1.0, 1.0);
    }

    if (xf86_crtc_supports_gamma(scrn))
      xf86DrvMsg(scrn->scrnIndex, X_INFO, "Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated.\n");

    /*
     * 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)
      {
          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;
          if (!xf86OutputSetInitialGamma(output))
            xf86DrvMsg (scrn->scrnIndex, X_WARNING, "Initial gamma correction for output %s: failed.\n", output->name);
      } else {
          output->crtc = NULL;
      }
    }

    if (scrn->display->virtualX == 0)
    {
      /*
       * 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);
    
      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)
      return FALSE;

    /*
     * 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);
    }

    /* Mirror output modes to scrn mode list */
    xf86SetScrnInfoModes (scrn);
    
    xfree (crtcs);
    xfree (modes);
    return TRUE;
}

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

      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)
          (*crtc->funcs->dpms)(crtc, DPMSModeOff);
#else
      (*crtc->funcs->dpms)(crtc, DPMSModeOff);
#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);
    int                 c;

    xf86PrepareOutputs(scrn);
    xf86PrepareCrtcs(scrn);

    for (c = 0; c < config->num_crtc; c++)
    {
      xf86CrtcPtr crtc = config->crtc[c];
      xf86OutputPtr     output = NULL;
      int         o;
      RRTransformPtr    transform;

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

      if (config->output[config->compat_output]->crtc == crtc)
          output = config->output[config->compat_output];
      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;
          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))
          return FALSE;
    }

    xf86DisableUnusedFunctions(scrn);
    return TRUE;
}

/**
 * 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 = config->output[config->compat_output];
    DisplayModePtr      compat_mode;
    int                 c;

    /*
     * Let the compat output drive the final mode selection
     */
    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
      {
          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 (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 (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 = xf86Screens[pScreen->myNum];

    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) 
      {
          crtc->funcs->dpms(crtc, DPMSModeOff);
          memset(&crtc->mode, 0, sizeof(crtc->mode));
          xf86RotateDestroy(crtc);
          crtc->active = FALSE;
      }
    }
    if (pScrn->pScreen)
      xf86_crtc_notify(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);
    }
}

#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);
    int                 i;
#ifdef RANDR_12_INTERFACE
    int                 size;
#endif
    
    if (output->MonInfo != NULL)
      xfree(output->MonInfo);
    
    output->MonInfo = edid_mon;

    if (config->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 */
    if (output == config->output[config->compat_output])
        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)
    {
      /* Pull out a phyiscal size from a detailed timing if available. */
      for (i = 0; i < 4; i++) {
          if (edid_mon->det_mon[i].type == DT &&
            edid_mon->det_mon[i].section.d_timings.h_size != 0 &&
            edid_mon->det_mon[i].section.d_timings.v_size != 0)
          {
            output->mm_width = edid_mon->det_mon[i].section.d_timings.h_size;
            output->mm_height = edid_mon->det_mon[i].section.d_timings.v_size;
            break;
          }
      }
    
      /* 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->scrnIndex, pDDCBus, TRUE);
    if (mon)
        xf86DDCApplyQuirks(scrn->scrnIndex, mon);

    return mon;
}

static char *_xf86ConnectorNames[] = {
                              "None", "VGA", "DVI-I", "DVI-D",
                              "DVI-A", "Composite", "S-Video",
                              "Component", "LFP", "Proprietary",
                              "HDMI", "DisplayPort",
                             };
char *
xf86ConnectorGetName(xf86ConnectorType connector)
{
    return _xf86ConnectorNames[connector];
}

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) {
          REGION_INIT (pScreen, &crtc_region_local, &crtc_box, 1);
          crtc_region = &crtc_region_local;
          REGION_INTERSECT (pScreen, crtc_region, crtc_region, reg);
      }
      *crtc_ret = crtc;
    }

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

    if (crtc_region != reg)
      REGION_UNINIT (pScreen, &crtc_region_local);

    return ret;
}

xf86_crtc_notify_proc_ptr
xf86_wrap_crtc_notify (ScreenPtr screen, xf86_crtc_notify_proc_ptr new)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    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;
}

void
xf86_unwrap_crtc_notify(ScreenPtr screen, xf86_crtc_notify_proc_ptr old)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(scrn);

    config->xf86_crtc_notify = old;
}

void
xf86_crtc_notify(ScreenPtr screen)
{
    ScrnInfoPtr         scrn = xf86Screens[screen->myNum];
    xf86CrtcConfigPtr   config = XF86_CRTC_CONFIG_PTR(scrn);
    
    if (config->xf86_crtc_notify)
      config->xf86_crtc_notify(screen);
}

Bool
xf86_crtc_supports_gamma(ScrnInfoPtr pScrn)
{
    xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
    xf86CrtcPtr crtc;

    if ((xf86CrtcConfigPrivateIndex == -1) || !xf86_config)
      return FALSE;

    if (xf86_config->num_crtc == 0)
      return FALSE;
    crtc = xf86_config->crtc[0];

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

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