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xf86Modes.c

/*
 * 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;

/*
 * This is the version number where we epoched.  These files get copied
 * into drivers that want to use this setup infrastructure on pre-1.3
 * servers, so when that happens they need to define these symbols
 * themselves.  However, _in_ the server, we basically always define them now.
 */
#if XORG_VERSION_CURRENT <= XORG_VERSION_NUMERIC(7,2,99,2,0)

/**
 * Calculates the horizontal sync rate of a mode.
 *
 * Exact copy of xf86Mode.c's.
 */
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.
 *
 * Exact copy of xf86Mode.c's.
 */
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 = (depth + 7) / 8;

    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)
{
    if (mode->name != NULL)
      xfree(mode->name);

    mode->name = XNFprintf("%dx%d", mode->HDisplay, mode->VDisplay);
}

/*
 * xf86SetModeCrtc
 *
 * Initialises the Crtc parameters for a mode.  The initialisation includes
 * adjustments for interlaced and double scan modes.
 *
 * Exact copy of xf86Mode.c's.
 */
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.
 *
 * This isn't in xf86Modes.c, but it might deserve to be there.
 */
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;
     }
}

/* exact copy of xf86Mode.c */
static void
add(char **p, char *new)
{
    *p = xnfrealloc(*p, strlen(*p) + strlen(new) + 2);
    strcat(*p, " ");
    strcat(*p, new);
}

/**
 * Print out a modeline.
 *
 * Convenient VRefresh printing was added, though, compared to xf86Mode.c
 */
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));
    xfree(flags);
}
#endif /* XORG_VERSION_CURRENT <= 7.2.99.2 */

/**
 * 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;

    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;

    for (mode = modeList; mode != NULL; mode = mode->next) {
      if (maxPitch > 0 && mode->HDisplay > maxPitch)
          mode->status = MODE_BAD_WIDTH;

      if (maxX > 0 && mode->HDisplay > maxX)
          mode->status = MODE_VIRTUAL_X;

      if (maxY > 0 && mode->VDisplay > 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)
#if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(7,0,0,0,0)
          mode->status = MODE_BANDWIDTH;
#else
          /* MODE_BANDWIDTH didn't exist in xserver 1.2 */
          mode->status = MODE_BAD;
#endif
    }
}

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)
{
    DisplayModePtr mode;

    for (mode = modeList; mode != NULL; mode = mode->next) {
      /* gratuitous duplication from pre-randr validation code */
      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))
          mode->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 = xcalloc(1, sizeof(DisplayModeRec));
      if (!mode)
          continue;
        mode->name       = xstrdup(conf_mode->ml_identifier);
      if (!mode->name)
      {
          xfree (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 (Bool interlaceAllowed, Bool doubleScanAllowed)
{
    DisplayModePtr  head = NULL, mode;
    int               i;

    for (i = 0; i < xf86NumDefaultModes; i++)
    {
      const DisplayModeRec    *defMode = &xf86DefaultModes[i];
      
      if (!interlaceAllowed && (defMode->Flags & V_INTERLACE))
          continue;
      if (!doubleScanAllowed && (defMode->Flags & V_DBLSCAN))
          continue;

      mode = xf86DuplicateMode(defMode);

      head = xf86ModesAdd(head, mode);
    }
    return head;
}

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