[PATCH xserver 1/3] xfree86/modes: Move gamma initialization to xf86RandR12Init12 v2

[Michel Dänzer]

On 26.07.2016 23:25, walter harms wrote:
> Am 26.07.2016 11:11, schrieb Michel Dänzer:
>>
>> diff --git a/hw/xfree86/modes/xf86RandR12.c b/hw/xfree86/modes/xf86RandR12.c
>> index 9f93270..5b24ebb 100644
>> --- a/hw/xfree86/modes/xf86RandR12.c
>> +++ b/hw/xfree86/modes/xf86RandR12.c
>> @@ -1313,6 +1313,116 @@ xf86RandR12CrtcGetGamma(ScreenPtr pScreen, RRCrtcPtr randr_crtc)
>>      return TRUE;
>>  }
>>  
>> +static void
>> +init_one_component(CARD16 *comp, unsigned size, unsigned shift, float gamma)
>> +{
>> +    int i;
>> +
>> +    if (gamma == 1.0) {
>> +        for (i = 0; i < size; i++)
>> +            comp[i] = i << shift;
>> +    } else {
>> +        for (i = 0; i < size; i++)
> I know it was not the the original source but to have a change to read this ...
> 
>           double a=(double) i / (double) (size - 1);
>  	  double b=(double) (size - 1) * (1 << shift)    //const
> 	  double c= 1.0 / (double) gamma;                //const
> 
>           comp[i] = (CARD16) (pow(a,c)*b);
> 
> feel free to move the lines marked const out of the loop to be faster

Would you like to send a follow-up patch and get proper credit for your
suggestion? :)


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer