libxtrans libX11 libX11 libXext mesa xserver git update 22 sep 2011

1 files changed, 771 insertions, 730 deletions

diff --git a/xorg-server/hw/xfree86/modes/xf86Modes.c b/xorg-server/hw/xfree86/modes/xf86Modes.c
index 45308f484..dcd3a2805 100644
--- a/xorg-server/hw/xfree86/modes/xf86Modes.c
+++ b/xorg-server/hw/xfree86/modes/xf86Modes.c
@@ -1,730 +1,771 @@
-/*

- * Copyright (c) 1997-2003 by The XFree86 Project, Inc.

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included in

- * all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

- * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

- * OTHER DEALINGS IN THE SOFTWARE.

- *

- * Except as contained in this notice, the name of the copyright holder(s)

- * and author(s) shall not be used in advertising or otherwise to promote

- * the sale, use or other dealings in this Software without prior written

- * authorization from the copyright holder(s) and author(s).

- */

-

-#ifdef HAVE_XORG_CONFIG_H

-#include <xorg-config.h>

-#else

-#ifdef HAVE_CONFIG_H

-#include <config.h>

-#endif

-#endif

-

-#include "xf86Modes.h"

-#include "xf86Priv.h"

-

-extern XF86ConfigPtr xf86configptr;

-

-/**

- * Calculates the horizontal sync rate of a mode.

- */

-double

-xf86ModeHSync(const DisplayModeRec *mode)

-{

-    double hsync = 0.0;

-    

-    if (mode->HSync > 0.0)

-	    hsync = mode->HSync;

-    else if (mode->HTotal > 0)

-	    hsync = (float)mode->Clock / (float)mode->HTotal;

-

-    return hsync;

-}

-

-/**

- * Calculates the vertical refresh rate of a mode.

- */

-double

-xf86ModeVRefresh(const DisplayModeRec *mode)

-{

-    double refresh = 0.0;

-

-    if (mode->VRefresh > 0.0)

-	refresh = mode->VRefresh;

-    else if (mode->HTotal > 0 && mode->VTotal > 0) {

-	refresh = mode->Clock * 1000.0 / mode->HTotal / mode->VTotal;

-	if (mode->Flags & V_INTERLACE)

-	    refresh *= 2.0;

-	if (mode->Flags & V_DBLSCAN)

-	    refresh /= 2.0;

-	if (mode->VScan > 1)

-	    refresh /= (float)(mode->VScan);

-    }

-    return refresh;

-}

-

-int

-xf86ModeWidth (const DisplayModeRec *mode, Rotation rotation)

-{

-    switch (rotation & 0xf) {

-    case RR_Rotate_0:

-    case RR_Rotate_180:

-	return mode->HDisplay;

-    case RR_Rotate_90:

-    case RR_Rotate_270:

-	return mode->VDisplay;

-    default:

-	return 0;

-    }

-}

-

-int

-xf86ModeHeight (const DisplayModeRec *mode, Rotation rotation)

-{

-    switch (rotation & 0xf) {

-    case RR_Rotate_0:

-    case RR_Rotate_180:

-	return mode->VDisplay;

-    case RR_Rotate_90:

-    case RR_Rotate_270:

-	return mode->HDisplay;

-    default:

-	return 0;

-    }

-}

-

-/** Calculates the memory bandwidth (in MiB/sec) of a mode. */

-unsigned int

-xf86ModeBandwidth(DisplayModePtr mode, int depth)

-{

-    float a_active, a_total, active_percent, pixels_per_second;

-    int bytes_per_pixel = bits_to_bytes(depth);

-

-    if (!mode->HTotal || !mode->VTotal || !mode->Clock)

-	return 0;

-

-    a_active = mode->HDisplay * mode->VDisplay;

-    a_total = mode->HTotal * mode->VTotal;

-    active_percent = a_active / a_total;

-    pixels_per_second = active_percent * mode->Clock * 1000.0;

-

-    return (unsigned int)(pixels_per_second * bytes_per_pixel / (1024 * 1024));

-}

-

-/** Sets a default mode name of <width>x<height> on a mode. */

-void

-xf86SetModeDefaultName(DisplayModePtr mode)

-{

-    Bool interlaced = !!(mode->Flags & V_INTERLACE);

-

-    free(mode->name);

-

-    XNFasprintf(&mode->name, "%dx%d%s", mode->HDisplay, mode->VDisplay,

-		interlaced ? "i" : "");

-}

-

-/*

- * xf86SetModeCrtc

- *

- * Initialises the Crtc parameters for a mode.  The initialisation includes

- * adjustments for interlaced and double scan modes.

- */

-void

-xf86SetModeCrtc(DisplayModePtr p, int adjustFlags)

-{

-    if ((p == NULL) || ((p->type & M_T_CRTC_C) == M_T_BUILTIN))

-	return;

-

-    p->CrtcHDisplay             = p->HDisplay;

-    p->CrtcHSyncStart           = p->HSyncStart;

-    p->CrtcHSyncEnd             = p->HSyncEnd;

-    p->CrtcHTotal               = p->HTotal;

-    p->CrtcHSkew                = p->HSkew;

-    p->CrtcVDisplay             = p->VDisplay;

-    p->CrtcVSyncStart           = p->VSyncStart;

-    p->CrtcVSyncEnd             = p->VSyncEnd;

-    p->CrtcVTotal               = p->VTotal;

-    if (p->Flags & V_INTERLACE) {

-	if (adjustFlags & INTERLACE_HALVE_V) {

-	    p->CrtcVDisplay         /= 2;

-	    p->CrtcVSyncStart       /= 2;

-	    p->CrtcVSyncEnd         /= 2;

-	    p->CrtcVTotal           /= 2;

-	}

-	/* Force interlaced modes to have an odd VTotal */

-	/* maybe we should only do this when INTERLACE_HALVE_V is set? */

-	p->CrtcVTotal |= 1;

-    }

-

-    if (p->Flags & V_DBLSCAN) {

-        p->CrtcVDisplay         *= 2;

-        p->CrtcVSyncStart       *= 2;

-        p->CrtcVSyncEnd         *= 2;

-        p->CrtcVTotal           *= 2;

-    }

-    if (p->VScan > 1) {

-        p->CrtcVDisplay         *= p->VScan;

-        p->CrtcVSyncStart       *= p->VScan;

-        p->CrtcVSyncEnd         *= p->VScan;

-        p->CrtcVTotal           *= p->VScan;

-    }

-    p->CrtcVBlankStart = min(p->CrtcVSyncStart, p->CrtcVDisplay);

-    p->CrtcVBlankEnd = max(p->CrtcVSyncEnd, p->CrtcVTotal);

-    p->CrtcHBlankStart = min(p->CrtcHSyncStart, p->CrtcHDisplay);

-    p->CrtcHBlankEnd = max(p->CrtcHSyncEnd, p->CrtcHTotal);

-

-    p->CrtcHAdjusted = FALSE;

-    p->CrtcVAdjusted = FALSE;

-}

-

-/**

- * Allocates and returns a copy of pMode, including pointers within pMode.

- */

-DisplayModePtr

-xf86DuplicateMode(const DisplayModeRec *pMode)

-{

-    DisplayModePtr pNew;

-

-    pNew = xnfalloc(sizeof(DisplayModeRec));

-    *pNew = *pMode;

-    pNew->next = NULL;

-    pNew->prev = NULL;

-

-    if (pMode->name == NULL)

-	xf86SetModeDefaultName(pNew);

-    else

-	pNew->name = xnfstrdup(pMode->name);

-

-    return pNew;

-}

-

-/**

- * Duplicates every mode in the given list and returns a pointer to the first

- * mode.

- *

- * \param modeList doubly-linked mode list

- */

-DisplayModePtr

-xf86DuplicateModes(ScrnInfoPtr pScrn, DisplayModePtr modeList)

-{

-    DisplayModePtr first = NULL, last = NULL;

-    DisplayModePtr mode;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	DisplayModePtr new;

-

-	new = xf86DuplicateMode(mode);

-

-	/* Insert pNew into modeList */

-	if (last) {

-	    last->next = new;

-	    new->prev = last;

-	} else {

-	    first = new;

-	    new->prev = NULL;

-	}

-	new->next = NULL;

-	last = new;

-    }

-

-    return first;

-}

-

-/**

- * Returns true if the given modes should program to the same timings.

- *

- * This doesn't use Crtc values, as it might be used on ModeRecs without the

- * Crtc values set.  So, it's assumed that the other numbers are enough.

- */

-Bool

-xf86ModesEqual(const DisplayModeRec *pMode1, const DisplayModeRec *pMode2)

-{

-     if (pMode1->Clock == pMode2->Clock &&

-	 pMode1->HDisplay == pMode2->HDisplay &&

-	 pMode1->HSyncStart == pMode2->HSyncStart &&

-	 pMode1->HSyncEnd == pMode2->HSyncEnd &&

-	 pMode1->HTotal == pMode2->HTotal &&

-	 pMode1->HSkew == pMode2->HSkew &&

-	 pMode1->VDisplay == pMode2->VDisplay &&

-	 pMode1->VSyncStart == pMode2->VSyncStart &&

-	 pMode1->VSyncEnd == pMode2->VSyncEnd &&

-	 pMode1->VTotal == pMode2->VTotal &&

-	 pMode1->VScan == pMode2->VScan &&

-	 pMode1->Flags == pMode2->Flags)

-     {

-	return TRUE;

-     } else {

-	return FALSE;

-     }

-}

-

-static void

-add(char **p, char *new)

-{

-    *p = xnfrealloc(*p, strlen(*p) + strlen(new) + 2);

-    strcat(*p, " ");

-    strcat(*p, new);

-}

-

-/**

- * Print out a modeline.

- */

-void

-xf86PrintModeline(int scrnIndex,DisplayModePtr mode)

-{

-    char tmp[256];

-    char *flags = xnfcalloc(1, 1);

-

-    if (mode->HSkew) { 

-	snprintf(tmp, 256, "hskew %i", mode->HSkew); 

-	add(&flags, tmp);

-    }

-    if (mode->VScan) { 

-	snprintf(tmp, 256, "vscan %i", mode->VScan); 

-	add(&flags, tmp);

-    }

-    if (mode->Flags & V_INTERLACE) add(&flags, "interlace");

-    if (mode->Flags & V_CSYNC) add(&flags, "composite");

-    if (mode->Flags & V_DBLSCAN) add(&flags, "doublescan");

-    if (mode->Flags & V_BCAST) add(&flags, "bcast");

-    if (mode->Flags & V_PHSYNC) add(&flags, "+hsync");

-    if (mode->Flags & V_NHSYNC) add(&flags, "-hsync");

-    if (mode->Flags & V_PVSYNC) add(&flags, "+vsync");

-    if (mode->Flags & V_NVSYNC) add(&flags, "-vsync");

-    if (mode->Flags & V_PCSYNC) add(&flags, "+csync");

-    if (mode->Flags & V_NCSYNC) add(&flags, "-csync");

-#if 0

-    if (mode->Flags & V_CLKDIV2) add(&flags, "vclk/2");

-#endif

-    xf86DrvMsg(scrnIndex, X_INFO,

-		   "Modeline \"%s\"x%.01f  %6.2f  %i %i %i %i  %i %i %i %i%s "

-		   "(%.01f kHz)\n",

-		   mode->name, mode->VRefresh, mode->Clock/1000., mode->HDisplay,

-		   mode->HSyncStart, mode->HSyncEnd, mode->HTotal,

-		   mode->VDisplay, mode->VSyncStart, mode->VSyncEnd,

-		   mode->VTotal, flags, xf86ModeHSync(mode));

-    free(flags);

-}

-

-/**

- * Marks as bad any modes with unsupported flags.

- *

- * \param modeList doubly-linked list of modes.

- * \param flags flags supported by the driver.

- *

- * \bug only V_INTERLACE and V_DBLSCAN are supported.  Is that enough?

- */

-void

-xf86ValidateModesFlags(ScrnInfoPtr pScrn, DisplayModePtr modeList,

-			    int flags)

-{

-    DisplayModePtr mode;

-

-    if (flags == (V_INTERLACE | V_DBLSCAN))

-	return;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	if (mode->Flags & V_INTERLACE && !(flags & V_INTERLACE))

-	    mode->status = MODE_NO_INTERLACE;

-	if (mode->Flags & V_DBLSCAN && !(flags & V_DBLSCAN))

-	    mode->status = MODE_NO_DBLESCAN;

-    }

-}

-

-/**

- * Marks as bad any modes extending beyond the given max X, Y, or pitch.

- *

- * \param modeList doubly-linked list of modes.

- */

-void

-xf86ValidateModesSize(ScrnInfoPtr pScrn, DisplayModePtr modeList,

-			  int maxX, int maxY, int maxPitch)

-{

-    DisplayModePtr mode;

-

-    if (maxPitch <= 0)

-	    maxPitch = MAXINT;

-    if (maxX <= 0)

-	    maxX = MAXINT;

-    if (maxY <= 0)

-	    maxY = MAXINT;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	if ((xf86ModeWidth(mode, RR_Rotate_0) > maxPitch ||

-	     xf86ModeWidth(mode, RR_Rotate_0) > maxX ||

-	     xf86ModeHeight(mode, RR_Rotate_0) > maxY) &&

-	    (xf86ModeWidth(mode, RR_Rotate_90) > maxPitch ||

-	     xf86ModeWidth(mode, RR_Rotate_90) > maxX ||

-	     xf86ModeHeight(mode, RR_Rotate_90) > maxY)) {

-	    if (xf86ModeWidth(mode, RR_Rotate_0) > maxPitch ||

-		xf86ModeWidth(mode, RR_Rotate_90) > maxPitch)

-		mode->status = MODE_BAD_WIDTH;

-

-	    if (xf86ModeWidth(mode, RR_Rotate_0) > maxX ||

-		xf86ModeWidth(mode, RR_Rotate_90) > maxX)

-		mode->status = MODE_VIRTUAL_X;

-

-	    if (xf86ModeHeight(mode, RR_Rotate_0) > maxY ||

-		xf86ModeHeight(mode, RR_Rotate_90) > maxY)

-		mode->status = MODE_VIRTUAL_Y;

-	}

-

-	if (mode->next == modeList)

-	    break;

-    }

-}

-

-/**

- * Marks as bad any modes that aren't supported by the given monitor's

- * hsync and vrefresh ranges.

- *

- * \param modeList doubly-linked list of modes.

- */

-void

-xf86ValidateModesSync(ScrnInfoPtr pScrn, DisplayModePtr modeList,

-			  MonPtr mon)

-{

-    DisplayModePtr mode;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	Bool bad;

-	int i;

-

-	bad = TRUE;

-	for (i = 0; i < mon->nHsync; i++) {

-	    if (xf86ModeHSync(mode) >= mon->hsync[i].lo * (1-SYNC_TOLERANCE) &&

-		xf86ModeHSync(mode) <= mon->hsync[i].hi * (1+SYNC_TOLERANCE))

-	    {

-		bad = FALSE;

-	    }

-	}

-	if (bad)

-	    mode->status = MODE_HSYNC;

-

-	bad = TRUE;

-	for (i = 0; i < mon->nVrefresh; i++) {

-	    if (xf86ModeVRefresh(mode) >= mon->vrefresh[i].lo * (1-SYNC_TOLERANCE) &&

-		xf86ModeVRefresh(mode) <= mon->vrefresh[i].hi * (1+SYNC_TOLERANCE))

-	    {

-		bad = FALSE;

-	    }

-	}

-	if (bad)

-	    mode->status = MODE_VSYNC;

-

-	if (mode->next == modeList)

-	    break;

-    }

-}

-

-/**

- * Marks as bad any modes extending beyond outside of the given clock ranges.

- *

- * \param modeList doubly-linked list of modes.

- * \param min pointer to minimums of clock ranges

- * \param max pointer to maximums of clock ranges

- * \param n_ranges number of ranges.

- */

-void

-xf86ValidateModesClocks(ScrnInfoPtr pScrn, DisplayModePtr modeList,

-			    int *min, int *max, int n_ranges)

-{

-    DisplayModePtr mode;

-    int i;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	Bool good = FALSE;

-	for (i = 0; i < n_ranges; i++) {

-	    if (mode->Clock >= min[i] * (1-SYNC_TOLERANCE) &&

-		mode->Clock <= max[i] * (1+SYNC_TOLERANCE)) {

-		good = TRUE;

-		break;

-	    }

-	}

-	if (!good)

-	    mode->status = MODE_CLOCK_RANGE;

-    }

-}

-

-/**

- * If the user has specified a set of mode names to use, mark as bad any modes

- * not listed.

- *

- * The user mode names specified are prefixes to names of modes, so "1024x768"

- * will match modes named "1024x768", "1024x768x75", "1024x768-good", but

- * "1024x768x75" would only match "1024x768x75" from that list.

- *

- * MODE_BAD is used as the rejection flag, for lack of a better flag.

- *

- * \param modeList doubly-linked list of modes.

- */

-void

-xf86ValidateModesUserConfig(ScrnInfoPtr pScrn, DisplayModePtr modeList)

-{

-    DisplayModePtr mode;

-

-    if (pScrn->display->modes[0] == NULL)

-	return;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	int i;

-	Bool good = FALSE;

-

-	for (i = 0; pScrn->display->modes[i] != NULL; i++) {

-	    if (strncmp(pScrn->display->modes[i], mode->name,

-			strlen(pScrn->display->modes[i])) == 0) {

-		good = TRUE;

-		break;

-	    }

-	}

-	if (!good)

-	    mode->status = MODE_BAD;

-    }

-}

-

-

-/**

- * Marks as bad any modes exceeding the given bandwidth.

- *

- * \param modeList doubly-linked list of modes.

- * \param bandwidth bandwidth in MHz.

- * \param depth color depth.

- */

-void

-xf86ValidateModesBandwidth(ScrnInfoPtr pScrn, DisplayModePtr modeList,

-			   unsigned int bandwidth, int depth)

-{

-    DisplayModePtr mode;

-

-    for (mode = modeList; mode != NULL; mode = mode->next) {

-	if (xf86ModeBandwidth(mode, depth) > bandwidth)

-	    mode->status = MODE_BANDWIDTH;

-    }

-}

-

-Bool

-xf86ModeIsReduced(const DisplayModeRec *mode)

-{

-    if ((((mode->HDisplay * 5 / 4) & ~0x07) > mode->HTotal) &&

-        ((mode->HTotal - mode->HDisplay) == 160) &&

-	((mode->HSyncEnd - mode->HDisplay) == 80) &&

-	((mode->HSyncEnd - mode->HSyncStart) == 32) &&

-	((mode->VSyncStart - mode->VDisplay) == 3))

-	return TRUE;

-    return FALSE;

-}

-

-/**

- * Marks as bad any reduced-blanking modes.

- *

- * \param modeList doubly-linked list of modes.

- */

-void

-xf86ValidateModesReducedBlanking(ScrnInfoPtr pScrn, DisplayModePtr modeList)

-{

-    for (; modeList != NULL; modeList = modeList->next)

-	if (xf86ModeIsReduced(modeList))

-	    modeList->status = MODE_NO_REDUCED;

-}

-

-/**

- * Frees any modes from the list with a status other than MODE_OK.

- *

- * \param modeList pointer to a doubly-linked or circular list of modes.

- * \param verbose determines whether the reason for mode invalidation is

- *	  printed.

- */

-void

-xf86PruneInvalidModes(ScrnInfoPtr pScrn, DisplayModePtr *modeList,

-			  Bool verbose)

-{

-    DisplayModePtr mode;

-

-    for (mode = *modeList; mode != NULL;) {

-	DisplayModePtr next = mode->next, first = *modeList;

-

-	if (mode->status != MODE_OK) {

-	    if (verbose) {

-		char *type = "";

-		if (mode->type & M_T_BUILTIN)

-		    type = "built-in ";

-		else if (mode->type & M_T_DEFAULT)

-		    type = "default ";

-		xf86DrvMsg(pScrn->scrnIndex, X_INFO,

-			   "Not using %smode \"%s\" (%s)\n", type, mode->name,

-			   xf86ModeStatusToString(mode->status));

-	    }

-	    xf86DeleteMode(modeList, mode);

-	}

-

-	if (next == first)

-	    break;

-	mode = next;

-    }

-}

-

-/**

- * Adds the new mode into the mode list, and returns the new list

- *

- * \param modes doubly-linked mode list.

- */

-DisplayModePtr

-xf86ModesAdd(DisplayModePtr modes, DisplayModePtr new)

-{

-    if (modes == NULL)

-	return new;

-

-    if (new) {

-	DisplayModePtr mode = modes;

-

-	while (mode->next)

-	    mode = mode->next;

-

-	mode->next = new;

-	new->prev = mode;

-    }

-

-    return modes;

-}

-

-/**

- * Build a mode list from a list of config file modes

- */

-static DisplayModePtr

-xf86GetConfigModes (XF86ConfModeLinePtr conf_mode)

-{

-    DisplayModePtr  head = NULL, prev = NULL, mode;

-    

-    for (; conf_mode; conf_mode = (XF86ConfModeLinePtr) conf_mode->list.next)

-    {

-        mode = calloc(1, sizeof(DisplayModeRec));

-	if (!mode)

-	    continue;

-        mode->name       = xstrdup(conf_mode->ml_identifier);

-	if (!mode->name)

-	{

-	    free(mode);

-	    continue;

-	}

-	mode->type       = 0;

-        mode->Clock      = conf_mode->ml_clock;

-        mode->HDisplay   = conf_mode->ml_hdisplay;

-        mode->HSyncStart = conf_mode->ml_hsyncstart;

-        mode->HSyncEnd   = conf_mode->ml_hsyncend;

-        mode->HTotal     = conf_mode->ml_htotal;

-        mode->VDisplay   = conf_mode->ml_vdisplay;

-        mode->VSyncStart = conf_mode->ml_vsyncstart;

-        mode->VSyncEnd   = conf_mode->ml_vsyncend;

-        mode->VTotal     = conf_mode->ml_vtotal;

-        mode->Flags      = conf_mode->ml_flags;

-        mode->HSkew      = conf_mode->ml_hskew;

-        mode->VScan      = conf_mode->ml_vscan;

-

-        mode->prev = prev;

-	mode->next = NULL;

-	if (prev)

-	    prev->next = mode;

-	else

-	    head = mode;

-	prev = mode;

-    }

-    return head;

-}

-

-/**

- * Build a mode list from a monitor configuration

- */

-DisplayModePtr

-xf86GetMonitorModes (ScrnInfoPtr pScrn, XF86ConfMonitorPtr conf_monitor)

-{

-    DisplayModePtr	    modes = NULL;

-    XF86ConfModesLinkPtr    modes_link;

-    

-    if (!conf_monitor)

-	return NULL;

-

-    /*

-     * first we collect the mode lines from the UseModes directive

-     */

-    for (modes_link = conf_monitor->mon_modes_sect_lst; 

-	 modes_link; 

-	 modes_link = modes_link->list.next)

-    {

-	/* If this modes link hasn't been resolved, go look it up now */

-	if (!modes_link->ml_modes)

-	    modes_link->ml_modes = xf86findModes (modes_link->ml_modes_str, 

-						  xf86configptr->conf_modes_lst);

-	if (modes_link->ml_modes)

-	    modes = xf86ModesAdd (modes,

-				  xf86GetConfigModes (modes_link->ml_modes->mon_modeline_lst));

-    }

-

-    return xf86ModesAdd (modes,

-			 xf86GetConfigModes (conf_monitor->mon_modeline_lst));

-}

-

-/**

- * Build a mode list containing all of the default modes

- */

-DisplayModePtr

-xf86GetDefaultModes (void)

-{

-    DisplayModePtr  head = NULL, mode;

-    int		    i;

-

-    for (i = 0; i < xf86NumDefaultModes; i++)

-    {

-	const DisplayModeRec	*defMode = &xf86DefaultModes[i];

-	

-	mode = xf86DuplicateMode(defMode);

-	head = xf86ModesAdd(head, mode);

-    }

-    return head;

-}

-

-/*

- * Walk a mode list and prune out duplicates.  Will preserve the preferred

- * mode of an otherwise-duplicate pair.

- *

- * Probably best to call this on lists that are all of a single class

- * (driver, default, user, etc.), otherwise, which mode gets deleted is

- * not especially well defined.

- *

- * Returns the new list.

- */

-

-DisplayModePtr

-xf86PruneDuplicateModes(DisplayModePtr modes)

-{

-    DisplayModePtr m, n, o;

-

-top:

-    for (m = modes; m; m = m->next) {

-	for (n = m->next; n; n = o) {

-	    o = n->next;

-	    if (xf86ModesEqual(m, n)) {

-		if (n->type & M_T_PREFERRED) {

-		    xf86DeleteMode(&modes, m);

-		    goto top;

-		}

-		else

-		    xf86DeleteMode(&modes, n);

-	    }

-	}

-    }

-

-    return modes;

-}

+/*
+ * Copyright (c) 1997-2003 by The XFree86 Project, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of the copyright holder(s)
+ * and author(s) shall not be used in advertising or otherwise to promote
+ * the sale, use or other dealings in this Software without prior written
+ * authorization from the copyright holder(s) and author(s).
+ */
+
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#else
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#endif
+
+#include "xf86Modes.h"
+#include "xf86Priv.h"
+
+extern XF86ConfigPtr xf86configptr;
+
+/**
+ * Calculates the horizontal sync rate of a mode.
+ */
+double
+xf86ModeHSync(const DisplayModeRec *mode)
+{
+    double hsync = 0.0;
+    
+    if (mode->HSync > 0.0)
+	    hsync = mode->HSync;
+    else if (mode->HTotal > 0)
+	    hsync = (float)mode->Clock / (float)mode->HTotal;
+
+    return hsync;
+}
+
+/**
+ * Calculates the vertical refresh rate of a mode.
+ */
+double
+xf86ModeVRefresh(const DisplayModeRec *mode)
+{
+    double refresh = 0.0;
+
+    if (mode->VRefresh > 0.0)
+	refresh = mode->VRefresh;
+    else if (mode->HTotal > 0 && mode->VTotal > 0) {
+	refresh = mode->Clock * 1000.0 / mode->HTotal / mode->VTotal;
+	if (mode->Flags & V_INTERLACE)
+	    refresh *= 2.0;
+	if (mode->Flags & V_DBLSCAN)
+	    refresh /= 2.0;
+	if (mode->VScan > 1)
+	    refresh /= (float)(mode->VScan);
+    }
+    return refresh;
+}
+
+int
+xf86ModeWidth (const DisplayModeRec *mode, Rotation rotation)
+{
+    switch (rotation & 0xf) {
+    case RR_Rotate_0:
+    case RR_Rotate_180:
+	return mode->HDisplay;
+    case RR_Rotate_90:
+    case RR_Rotate_270:
+	return mode->VDisplay;
+    default:
+	return 0;
+    }
+}
+
+int
+xf86ModeHeight (const DisplayModeRec *mode, Rotation rotation)
+{
+    switch (rotation & 0xf) {
+    case RR_Rotate_0:
+    case RR_Rotate_180:
+	return mode->VDisplay;
+    case RR_Rotate_90:
+    case RR_Rotate_270:
+	return mode->HDisplay;
+    default:
+	return 0;
+    }
+}
+
+/** Calculates the memory bandwidth (in MiB/sec) of a mode. */
+unsigned int
+xf86ModeBandwidth(DisplayModePtr mode, int depth)
+{
+    float a_active, a_total, active_percent, pixels_per_second;
+    int bytes_per_pixel = bits_to_bytes(depth);
+
+    if (!mode->HTotal || !mode->VTotal || !mode->Clock)
+	return 0;
+
+    a_active = mode->HDisplay * mode->VDisplay;
+    a_total = mode->HTotal * mode->VTotal;
+    active_percent = a_active / a_total;
+    pixels_per_second = active_percent * mode->Clock * 1000.0;
+
+    return (unsigned int)(pixels_per_second * bytes_per_pixel / (1024 * 1024));
+}
+
+/** Sets a default mode name of <width>x<height> on a mode. */
+void
+xf86SetModeDefaultName(DisplayModePtr mode)
+{
+    Bool interlaced = !!(mode->Flags & V_INTERLACE);
+
+    free(mode->name);
+
+    XNFasprintf(&mode->name, "%dx%d%s", mode->HDisplay, mode->VDisplay,
+		interlaced ? "i" : "");
+}
+
+/*
+ * xf86SetModeCrtc
+ *
+ * Initialises the Crtc parameters for a mode.  The initialisation includes
+ * adjustments for interlaced and double scan modes.
+ */
+void
+xf86SetModeCrtc(DisplayModePtr p, int adjustFlags)
+{
+    if ((p == NULL) || ((p->type & M_T_CRTC_C) == M_T_BUILTIN))
+	return;
+
+    p->CrtcHDisplay             = p->HDisplay;
+    p->CrtcHSyncStart           = p->HSyncStart;
+    p->CrtcHSyncEnd             = p->HSyncEnd;
+    p->CrtcHTotal               = p->HTotal;
+    p->CrtcHSkew                = p->HSkew;
+    p->CrtcVDisplay             = p->VDisplay;
+    p->CrtcVSyncStart           = p->VSyncStart;
+    p->CrtcVSyncEnd             = p->VSyncEnd;
+    p->CrtcVTotal               = p->VTotal;
+    if (p->Flags & V_INTERLACE) {
+	if (adjustFlags & INTERLACE_HALVE_V) {
+	    p->CrtcVDisplay         /= 2;
+	    p->CrtcVSyncStart       /= 2;
+	    p->CrtcVSyncEnd         /= 2;
+	    p->CrtcVTotal           /= 2;
+	}
+	/* Force interlaced modes to have an odd VTotal */
+	/* maybe we should only do this when INTERLACE_HALVE_V is set? */
+	p->CrtcVTotal |= 1;
+    }
+
+    if (p->Flags & V_DBLSCAN) {
+        p->CrtcVDisplay         *= 2;
+        p->CrtcVSyncStart       *= 2;
+        p->CrtcVSyncEnd         *= 2;
+        p->CrtcVTotal           *= 2;
+    }
+    if (p->VScan > 1) {
+        p->CrtcVDisplay         *= p->VScan;
+        p->CrtcVSyncStart       *= p->VScan;
+        p->CrtcVSyncEnd         *= p->VScan;
+        p->CrtcVTotal           *= p->VScan;
+    }
+    p->CrtcVBlankStart = min(p->CrtcVSyncStart, p->CrtcVDisplay);
+    p->CrtcVBlankEnd = max(p->CrtcVSyncEnd, p->CrtcVTotal);
+    p->CrtcHBlankStart = min(p->CrtcHSyncStart, p->CrtcHDisplay);
+    p->CrtcHBlankEnd = max(p->CrtcHSyncEnd, p->CrtcHTotal);
+
+    p->CrtcHAdjusted = FALSE;
+    p->CrtcVAdjusted = FALSE;
+}
+
+/**
+ * Allocates and returns a copy of pMode, including pointers within pMode.
+ */
+DisplayModePtr
+xf86DuplicateMode(const DisplayModeRec *pMode)
+{
+    DisplayModePtr pNew;
+
+    pNew = xnfalloc(sizeof(DisplayModeRec));
+    *pNew = *pMode;
+    pNew->next = NULL;
+    pNew->prev = NULL;
+
+    if (pMode->name == NULL)
+	xf86SetModeDefaultName(pNew);
+    else
+	pNew->name = xnfstrdup(pMode->name);
+
+    return pNew;
+}
+
+/**
+ * Duplicates every mode in the given list and returns a pointer to the first
+ * mode.
+ *
+ * \param modeList doubly-linked mode list
+ */
+DisplayModePtr
+xf86DuplicateModes(ScrnInfoPtr pScrn, DisplayModePtr modeList)
+{
+    DisplayModePtr first = NULL, last = NULL;
+    DisplayModePtr mode;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	DisplayModePtr new;
+
+	new = xf86DuplicateMode(mode);
+
+	/* Insert pNew into modeList */
+	if (last) {
+	    last->next = new;
+	    new->prev = last;
+	} else {
+	    first = new;
+	    new->prev = NULL;
+	}
+	new->next = NULL;
+	last = new;
+    }
+
+    return first;
+}
+
+/**
+ * Returns true if the given modes should program to the same timings.
+ *
+ * This doesn't use Crtc values, as it might be used on ModeRecs without the
+ * Crtc values set.  So, it's assumed that the other numbers are enough.
+ */
+Bool
+xf86ModesEqual(const DisplayModeRec *pMode1, const DisplayModeRec *pMode2)
+{
+     if (pMode1->Clock == pMode2->Clock &&
+	 pMode1->HDisplay == pMode2->HDisplay &&
+	 pMode1->HSyncStart == pMode2->HSyncStart &&
+	 pMode1->HSyncEnd == pMode2->HSyncEnd &&
+	 pMode1->HTotal == pMode2->HTotal &&
+	 pMode1->HSkew == pMode2->HSkew &&
+	 pMode1->VDisplay == pMode2->VDisplay &&
+	 pMode1->VSyncStart == pMode2->VSyncStart &&
+	 pMode1->VSyncEnd == pMode2->VSyncEnd &&
+	 pMode1->VTotal == pMode2->VTotal &&
+	 pMode1->VScan == pMode2->VScan &&
+	 pMode1->Flags == pMode2->Flags)
+     {
+	return TRUE;
+     } else {
+	return FALSE;
+     }
+}
+
+static void
+add(char **p, char *new)
+{
+    *p = xnfrealloc(*p, strlen(*p) + strlen(new) + 2);
+    strcat(*p, " ");
+    strcat(*p, new);
+}
+
+/**
+ * Print out a modeline.
+ *
+ * The mode type bits are informational except for the capitalized U
+ * and P bits which give sort order priority.  Letter map:
+ *
+ * USERPREF, U, user preferred is set from the xorg.conf Monitor
+ * Option "PreferredMode" or from the Screen Display Modes statement.
+ * This unique modeline is moved to the head of the list after sorting.
+ *
+ * DRIVER, e, is set by the video driver, EDID or flat panel native.
+ *
+ * USERDEF, z, a configured zoom mode Ctrl+Alt+Keypad-{Plus,Minus}.
+ *
+ * DEFAULT, d, a compiled-in default.
+ *
+ * PREFERRED, P, driver preferred is set by the video device driver,
+ * e.g. the EDID detailed timing modeline.  This is a true sort
+ * priority and multiple P modes form a sorted sublist at the list
+ * head.
+ *
+ * BUILTIN, b, a hardware fixed CRTC mode.
+ *
+ * See modes/xf86Crtc.c: xf86ProbeOutputModes().
+ */
+void
+xf86PrintModeline(int scrnIndex, DisplayModePtr mode)
+{
+    char tmp[256];
+    char *flags = xnfcalloc(1, 1);
+#define TBITS 6
+    const char tchar[TBITS+1] = "UezdPb";
+    int tbit[TBITS] = {
+	M_T_USERPREF, M_T_DRIVER, M_T_USERDEF,
+	M_T_DEFAULT, M_T_PREFERRED, M_T_BUILTIN
+    };
+    char type[TBITS+2];   /* +1 for leading space */
+#undef TBITS
+    int tlen = 0;
+
+    if (mode->type) {
+	int i;
+
+	type[tlen++] = ' ';
+	for (i = 0; tchar[i]; i++)
+	    if (mode->type & tbit[i])
+		type[tlen++] = tchar[i];
+    }
+    type[tlen] = '\0';
+
+    if (mode->HSkew) { 
+	snprintf(tmp, 256, "hskew %i", mode->HSkew); 
+	add(&flags, tmp);
+    }
+    if (mode->VScan) { 
+	snprintf(tmp, 256, "vscan %i", mode->VScan); 
+	add(&flags, tmp);
+    }
+    if (mode->Flags & V_INTERLACE) add(&flags, "interlace");
+    if (mode->Flags & V_CSYNC) add(&flags, "composite");
+    if (mode->Flags & V_DBLSCAN) add(&flags, "doublescan");
+    if (mode->Flags & V_BCAST) add(&flags, "bcast");
+    if (mode->Flags & V_PHSYNC) add(&flags, "+hsync");
+    if (mode->Flags & V_NHSYNC) add(&flags, "-hsync");
+    if (mode->Flags & V_PVSYNC) add(&flags, "+vsync");
+    if (mode->Flags & V_NVSYNC) add(&flags, "-vsync");
+    if (mode->Flags & V_PCSYNC) add(&flags, "+csync");
+    if (mode->Flags & V_NCSYNC) add(&flags, "-csync");
+#if 0
+    if (mode->Flags & V_CLKDIV2) add(&flags, "vclk/2");
+#endif
+    xf86DrvMsg(scrnIndex, X_INFO,
+	       "Modeline \"%s\"x%.01f  %6.2f  %i %i %i %i  %i %i %i %i%s"
+	       " (%.01f kHz%s)\n",
+	       mode->name, mode->VRefresh, mode->Clock/1000.,
+	       mode->HDisplay, mode->HSyncStart, mode->HSyncEnd, mode->HTotal,
+	       mode->VDisplay, mode->VSyncStart, mode->VSyncEnd, mode->VTotal,
+	       flags, xf86ModeHSync(mode), type);
+    free(flags);
+}
+
+/**
+ * Marks as bad any modes with unsupported flags.
+ *
+ * \param modeList doubly-linked list of modes.
+ * \param flags flags supported by the driver.
+ *
+ * \bug only V_INTERLACE and V_DBLSCAN are supported.  Is that enough?
+ */
+void
+xf86ValidateModesFlags(ScrnInfoPtr pScrn, DisplayModePtr modeList,
+			    int flags)
+{
+    DisplayModePtr mode;
+
+    if (flags == (V_INTERLACE | V_DBLSCAN))
+	return;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	if (mode->Flags & V_INTERLACE && !(flags & V_INTERLACE))
+	    mode->status = MODE_NO_INTERLACE;
+	if (mode->Flags & V_DBLSCAN && !(flags & V_DBLSCAN))
+	    mode->status = MODE_NO_DBLESCAN;
+    }
+}
+
+/**
+ * Marks as bad any modes extending beyond the given max X, Y, or pitch.
+ *
+ * \param modeList doubly-linked list of modes.
+ */
+void
+xf86ValidateModesSize(ScrnInfoPtr pScrn, DisplayModePtr modeList,
+			  int maxX, int maxY, int maxPitch)
+{
+    DisplayModePtr mode;
+
+    if (maxPitch <= 0)
+	    maxPitch = MAXINT;
+    if (maxX <= 0)
+	    maxX = MAXINT;
+    if (maxY <= 0)
+	    maxY = MAXINT;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	if ((xf86ModeWidth(mode, RR_Rotate_0) > maxPitch ||
+	     xf86ModeWidth(mode, RR_Rotate_0) > maxX ||
+	     xf86ModeHeight(mode, RR_Rotate_0) > maxY) &&
+	    (xf86ModeWidth(mode, RR_Rotate_90) > maxPitch ||
+	     xf86ModeWidth(mode, RR_Rotate_90) > maxX ||
+	     xf86ModeHeight(mode, RR_Rotate_90) > maxY)) {
+	    if (xf86ModeWidth(mode, RR_Rotate_0) > maxPitch ||
+		xf86ModeWidth(mode, RR_Rotate_90) > maxPitch)
+		mode->status = MODE_BAD_WIDTH;
+
+	    if (xf86ModeWidth(mode, RR_Rotate_0) > maxX ||
+		xf86ModeWidth(mode, RR_Rotate_90) > maxX)
+		mode->status = MODE_VIRTUAL_X;
+
+	    if (xf86ModeHeight(mode, RR_Rotate_0) > maxY ||
+		xf86ModeHeight(mode, RR_Rotate_90) > maxY)
+		mode->status = MODE_VIRTUAL_Y;
+	}
+
+	if (mode->next == modeList)
+	    break;
+    }
+}
+
+/**
+ * Marks as bad any modes that aren't supported by the given monitor's
+ * hsync and vrefresh ranges.
+ *
+ * \param modeList doubly-linked list of modes.
+ */
+void
+xf86ValidateModesSync(ScrnInfoPtr pScrn, DisplayModePtr modeList,
+			  MonPtr mon)
+{
+    DisplayModePtr mode;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	Bool bad;
+	int i;
+
+	bad = TRUE;
+	for (i = 0; i < mon->nHsync; i++) {
+	    if (xf86ModeHSync(mode) >= mon->hsync[i].lo * (1-SYNC_TOLERANCE) &&
+		xf86ModeHSync(mode) <= mon->hsync[i].hi * (1+SYNC_TOLERANCE))
+	    {
+		bad = FALSE;
+	    }
+	}
+	if (bad)
+	    mode->status = MODE_HSYNC;
+
+	bad = TRUE;
+	for (i = 0; i < mon->nVrefresh; i++) {
+	    if (xf86ModeVRefresh(mode) >= mon->vrefresh[i].lo * (1-SYNC_TOLERANCE) &&
+		xf86ModeVRefresh(mode) <= mon->vrefresh[i].hi * (1+SYNC_TOLERANCE))
+	    {
+		bad = FALSE;
+	    }
+	}
+	if (bad)
+	    mode->status = MODE_VSYNC;
+
+	if (mode->next == modeList)
+	    break;
+    }
+}
+
+/**
+ * Marks as bad any modes extending beyond outside of the given clock ranges.
+ *
+ * \param modeList doubly-linked list of modes.
+ * \param min pointer to minimums of clock ranges
+ * \param max pointer to maximums of clock ranges
+ * \param n_ranges number of ranges.
+ */
+void
+xf86ValidateModesClocks(ScrnInfoPtr pScrn, DisplayModePtr modeList,
+			    int *min, int *max, int n_ranges)
+{
+    DisplayModePtr mode;
+    int i;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	Bool good = FALSE;
+	for (i = 0; i < n_ranges; i++) {
+	    if (mode->Clock >= min[i] * (1-SYNC_TOLERANCE) &&
+		mode->Clock <= max[i] * (1+SYNC_TOLERANCE)) {
+		good = TRUE;
+		break;
+	    }
+	}
+	if (!good)
+	    mode->status = MODE_CLOCK_RANGE;
+    }
+}
+
+/**
+ * If the user has specified a set of mode names to use, mark as bad any modes
+ * not listed.
+ *
+ * The user mode names specified are prefixes to names of modes, so "1024x768"
+ * will match modes named "1024x768", "1024x768x75", "1024x768-good", but
+ * "1024x768x75" would only match "1024x768x75" from that list.
+ *
+ * MODE_BAD is used as the rejection flag, for lack of a better flag.
+ *
+ * \param modeList doubly-linked list of modes.
+ */
+void
+xf86ValidateModesUserConfig(ScrnInfoPtr pScrn, DisplayModePtr modeList)
+{
+    DisplayModePtr mode;
+
+    if (pScrn->display->modes[0] == NULL)
+	return;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	int i;
+	Bool good = FALSE;
+
+	for (i = 0; pScrn->display->modes[i] != NULL; i++) {
+	    if (strncmp(pScrn->display->modes[i], mode->name,
+			strlen(pScrn->display->modes[i])) == 0) {
+		good = TRUE;
+		break;
+	    }
+	}
+	if (!good)
+	    mode->status = MODE_BAD;
+    }
+}
+
+
+/**
+ * Marks as bad any modes exceeding the given bandwidth.
+ *
+ * \param modeList doubly-linked list of modes.
+ * \param bandwidth bandwidth in MHz.
+ * \param depth color depth.
+ */
+void
+xf86ValidateModesBandwidth(ScrnInfoPtr pScrn, DisplayModePtr modeList,
+			   unsigned int bandwidth, int depth)
+{
+    DisplayModePtr mode;
+
+    for (mode = modeList; mode != NULL; mode = mode->next) {
+	if (xf86ModeBandwidth(mode, depth) > bandwidth)
+	    mode->status = MODE_BANDWIDTH;
+    }
+}
+
+Bool
+xf86ModeIsReduced(const DisplayModeRec *mode)
+{
+    if ((((mode->HDisplay * 5 / 4) & ~0x07) > mode->HTotal) &&
+        ((mode->HTotal - mode->HDisplay) == 160) &&
+	((mode->HSyncEnd - mode->HDisplay) == 80) &&
+	((mode->HSyncEnd - mode->HSyncStart) == 32) &&
+	((mode->VSyncStart - mode->VDisplay) == 3))
+	return TRUE;
+    return FALSE;
+}
+
+/**
+ * Marks as bad any reduced-blanking modes.
+ *
+ * \param modeList doubly-linked list of modes.
+ */
+void
+xf86ValidateModesReducedBlanking(ScrnInfoPtr pScrn, DisplayModePtr modeList)
+{
+    for (; modeList != NULL; modeList = modeList->next)
+	if (xf86ModeIsReduced(modeList))
+	    modeList->status = MODE_NO_REDUCED;
+}
+
+/**
+ * Frees any modes from the list with a status other than MODE_OK.
+ *
+ * \param modeList pointer to a doubly-linked or circular list of modes.
+ * \param verbose determines whether the reason for mode invalidation is
+ *	  printed.
+ */
+void
+xf86PruneInvalidModes(ScrnInfoPtr pScrn, DisplayModePtr *modeList,
+			  Bool verbose)
+{
+    DisplayModePtr mode;
+
+    for (mode = *modeList; mode != NULL;) {
+	DisplayModePtr next = mode->next, first = *modeList;
+
+	if (mode->status != MODE_OK) {
+	    if (verbose) {
+		char *type = "";
+		if (mode->type & M_T_BUILTIN)
+		    type = "built-in ";
+		else if (mode->type & M_T_DEFAULT)
+		    type = "default ";
+		xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+			   "Not using %smode \"%s\" (%s)\n", type, mode->name,
+			   xf86ModeStatusToString(mode->status));
+	    }
+	    xf86DeleteMode(modeList, mode);
+	}
+
+	if (next == first)
+	    break;
+	mode = next;
+    }
+}
+
+/**
+ * Adds the new mode into the mode list, and returns the new list
+ *
+ * \param modes doubly-linked mode list.
+ */
+DisplayModePtr
+xf86ModesAdd(DisplayModePtr modes, DisplayModePtr new)
+{
+    if (modes == NULL)
+	return new;
+
+    if (new) {
+	DisplayModePtr mode = modes;
+
+	while (mode->next)
+	    mode = mode->next;
+
+	mode->next = new;
+	new->prev = mode;
+    }
+
+    return modes;
+}
+
+/**
+ * Build a mode list from a list of config file modes
+ */
+static DisplayModePtr
+xf86GetConfigModes (XF86ConfModeLinePtr conf_mode)
+{
+    DisplayModePtr  head = NULL, prev = NULL, mode;
+    
+    for (; conf_mode; conf_mode = (XF86ConfModeLinePtr) conf_mode->list.next)
+    {
+        mode = calloc(1, sizeof(DisplayModeRec));
+	if (!mode)
+	    continue;
+        mode->name       = xstrdup(conf_mode->ml_identifier);
+	if (!mode->name)
+	{
+	    free(mode);
+	    continue;
+	}
+	mode->type       = 0;
+        mode->Clock      = conf_mode->ml_clock;
+        mode->HDisplay   = conf_mode->ml_hdisplay;
+        mode->HSyncStart = conf_mode->ml_hsyncstart;
+        mode->HSyncEnd   = conf_mode->ml_hsyncend;
+        mode->HTotal     = conf_mode->ml_htotal;
+        mode->VDisplay   = conf_mode->ml_vdisplay;
+        mode->VSyncStart = conf_mode->ml_vsyncstart;
+        mode->VSyncEnd   = conf_mode->ml_vsyncend;
+        mode->VTotal     = conf_mode->ml_vtotal;
+        mode->Flags      = conf_mode->ml_flags;
+        mode->HSkew      = conf_mode->ml_hskew;
+        mode->VScan      = conf_mode->ml_vscan;
+
+        mode->prev = prev;
+	mode->next = NULL;
+	if (prev)
+	    prev->next = mode;
+	else
+	    head = mode;
+	prev = mode;
+    }
+    return head;
+}
+
+/**
+ * Build a mode list from a monitor configuration
+ */
+DisplayModePtr
+xf86GetMonitorModes (ScrnInfoPtr pScrn, XF86ConfMonitorPtr conf_monitor)
+{
+    DisplayModePtr	    modes = NULL;
+    XF86ConfModesLinkPtr    modes_link;
+    
+    if (!conf_monitor)
+	return NULL;
+
+    /*
+     * first we collect the mode lines from the UseModes directive
+     */
+    for (modes_link = conf_monitor->mon_modes_sect_lst; 
+	 modes_link; 
+	 modes_link = modes_link->list.next)
+    {
+	/* If this modes link hasn't been resolved, go look it up now */
+	if (!modes_link->ml_modes)
+	    modes_link->ml_modes = xf86findModes (modes_link->ml_modes_str, 
+						  xf86configptr->conf_modes_lst);
+	if (modes_link->ml_modes)
+	    modes = xf86ModesAdd (modes,
+				  xf86GetConfigModes (modes_link->ml_modes->mon_modeline_lst));
+    }
+
+    return xf86ModesAdd (modes,
+			 xf86GetConfigModes (conf_monitor->mon_modeline_lst));
+}
+
+/**
+ * Build a mode list containing all of the default modes
+ */
+DisplayModePtr
+xf86GetDefaultModes (void)
+{
+    DisplayModePtr  head = NULL, mode;
+    int		    i;
+
+    for (i = 0; i < xf86NumDefaultModes; i++)
+    {
+	const DisplayModeRec	*defMode = &xf86DefaultModes[i];
+	
+	mode = xf86DuplicateMode(defMode);
+	head = xf86ModesAdd(head, mode);
+    }
+    return head;
+}
+
+/*
+ * Walk a mode list and prune out duplicates.  Will preserve the preferred
+ * mode of an otherwise-duplicate pair.
+ *
+ * Probably best to call this on lists that are all of a single class
+ * (driver, default, user, etc.), otherwise, which mode gets deleted is
+ * not especially well defined.
+ *
+ * Returns the new list.
+ */
+
+DisplayModePtr
+xf86PruneDuplicateModes(DisplayModePtr modes)
+{
+    DisplayModePtr m, n, o;
+
+top:
+    for (m = modes; m; m = m->next) {
+	for (n = m->next; n; n = o) {
+	    o = n->next;
+	    if (xf86ModesEqual(m, n)) {
+		if (n->type & M_T_PREFERRED) {
+		    xf86DeleteMode(&modes, m);
+		    goto top;
+		}
+		else
+		    xf86DeleteMode(&modes, n);
+	    }
+	}
+    }
+
+    return modes;
+}