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randr/xfree86: Fix initial gamma computation. 

- The previous version overflowed sometimes.
This commit is contained in:
Maarten Maathuis 2008-12-22 19:53:14 +01:00
parent ba9dc353a6
commit b5736d237a
1 changed files with 6 additions and 7 deletions
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13
hw/xfree86/modes/xf86Crtc.c
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@ -2248,24 +2248,23 @@ xf86CrtcSetInitialGamma(xf86CrtcPtr crtc, float gamma_red, float gamma_green,
* So take the default gamma size for lack of something better.
*/
for (i = 0; i < size; i++) {
/* Code partially borrowed from ComputeGamma(). */
if (gamma_red == 1.0)
red[i] = i << 8;
else
red[i] = (CARD16)((pow((double)i/(double)size,
gamma_red) * (double)size + 0.5)*256);
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,
gamma_green) * (double)size + 0.5)*256);
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,
gamma_blue) * (double)size + 0.5)*256);
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. */