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winex11: Reject too bright gamma ramps.

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This commit is contained in:
André Hentschel 2011-08-23 23:16:26 +02:00 committed by Alexandre Julliard
parent 20fa3fe802
commit 56e804eea4
2 changed files with 12 additions and 0 deletions
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7
dlls/gdi32/tests/dc.c
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@ -644,6 +644,13 @@ static void test_gamma(void)
ret = SetDeviceGammaRamp(hdc, &ramp);
ok(ret, "SetDeviceGammaRamp failed\n");
/* try a bright gamma ramp */
ramp[0][0] = 0;
ramp[0][1] = 0x7FFF;
for (i = 2; i < 256; i++) ramp[0][i] = 0xFFFF;
ret = SetDeviceGammaRamp(hdc, &ramp);
ok(!ret, "SetDeviceGammaRamp succeeded\n");
/* cleanup: set old ramp again */
ret = SetDeviceGammaRamp(hdc, &oldramp);
ok(ret, "SetDeviceGammaRamp failed\n");

5
dlls/winex11.drv/xvidmode.c
View file

@ -339,6 +339,11 @@ static BOOL ComputeGammaFromRamp(WORD ramp[256], float *gamma)
ERR("ramp not uniform (max=%f, min=%f, avg=%f), rejected\n", g_max, g_min, g_avg);
return FALSE;
}
/* check that the gamma is not too bright */
if (g_avg < 0.2) {
ERR("too bright gamma ( %5.3f), rejected\n", g_avg);
return FALSE;
}
/* ok, now we're pretty sure we can set the desired gamma ramp,
* so go for it */
*gamma = 1/g_avg;