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Re-add sync range inference from legacy setup to RANDR 1.2.

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This commit is contained in:
Adam Jackson 2008-05-16 10:25:12 -04:00
parent f52f6c5c7e
commit a4bbe1c8bc
1 changed files with 48 additions and 0 deletions
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48
hw/xfree86/modes/xf86Crtc.c
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@ -1300,6 +1300,50 @@ preferredMode(ScrnInfoPtr pScrn, xf86OutputPtr output)
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;
}
_X_EXPORT void
xf86ProbeOutputModes (ScrnInfoPtr scrn, int maxX, int maxY)
{
@ -1417,6 +1461,10 @@ xf86ProbeOutputModes (ScrnInfoPtr scrn, int maxX, int maxY)
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