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Fixed bug 3134 - CalculateXRandRRefreshRate() returns incorrect refresh rate due to floating point truncation.

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Michael

In SDL_x11modes.c the CalculateXRandRRefreshRate() function performs integer math on values that may return fractional results. This causes a value that would be calculated as 59.99972... to be returned as 59. In Linux the xrandr command returns 60Hz for this particular display mode yet SDL returns 59Hz.

I suggest this function be updated to correctly round the result of the calculation instead of truncating the result.
This commit is contained in:
Sam Lantinga 2016-10-01 14:16:04 -07:00
parent 7543092add
commit 0250eb3c4f
1 changed files with 2 additions and 2 deletions
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4
src/video/x11/SDL_x11modes.c
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@ -264,8 +264,8 @@ CheckXRandR(Display * display, int *major, int *minor)
static int
CalculateXRandRRefreshRate(const XRRModeInfo *info)
{
return (info->hTotal
&& info->vTotal) ? (info->dotClock / (info->hTotal * info->vTotal)) : 0;
return (info->hTotal && info->vTotal) ?
round(((double)info->dotClock / (double)(info->hTotal * info->vTotal))) : 0;
}
static SDL_bool