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Optimize xBRZ with ARGB a bit.

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Alpha is quite common with PSP textures.  Measured by Zenju to provide a
15% performance improvement in Visual Studio.
This commit is contained in:
Unknown W. Brackets 2015-02-08 14:58:01 -08:00
parent 0982336565
commit 1075a394ce
1 changed files with 5 additions and 1 deletions
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6
ext/xbrz/xbrz.cpp
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@ -1145,7 +1145,11 @@ struct ColorDistanceARGB
3. if a1 = 1, distance should be: 255 * (1 - a2) + a2 * distYCbCr()
*/
return std::min(a1, a2) * distYCbCrBuffer->dist(pix1, pix2) + 255 * abs(a1 - a2);
const double d = distYCbCrBuffer->dist(pix1, pix2);
if (a1 > a2)
return a2 * d + 255 * (a1 - a2);
else
return a1 * d + 255 * (a2 - a1);
//if (pix1 == pix2)
// return 0;