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Try to avoid doing work in ColorDistanceARGB::dist

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This results in a 10% speedup
This commit is contained in:
Marc Aldorasi 2023-02-04 00:00:24 -05:00
parent 6cedfcf22d
commit 08a41a90eb
1 changed files with 13 additions and 4 deletions
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17
desmume/src/filter/xbrz.cpp
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@ -1152,8 +1152,8 @@ struct ColorDistanceARGB
{
static double dist(uint32_t pix1, uint32_t pix2, double luminanceWeight)
{
const double a1 = getAlpha(pix1) / 255.0 ;
const double a2 = getAlpha(pix2) / 255.0 ;
const int a1 = getAlpha(pix1);
const int a2 = getAlpha(pix2);
/*
Requirements for a color distance handling alpha channel: with a1, a2 in [0, 1]
@ -1162,13 +1162,22 @@ struct ColorDistanceARGB
3. if a1 = 1, ??? maybe: 255 * (1 - a2) + a2 * distYCbCr()
*/
if (a1 == 0)
return a2;
if (a2 == 0)
return a1;
//return std::min(a1, a2) * DistYCbCrBuffer::dist(pix1, pix2) + 255 * abs(a1 - a2);
//=> following code is 15% faster:
const double d = DistYCbCrBuffer::dist(pix1, pix2);
if (a1 == 255 && a2 == 255)
return d;
if (a1 == a2)
return a1 * d / 255.0;
if (a1 < a2)
return a1 * d + 255 * (a2 - a1);
return a1 * d / 255.0 + (a2 - a1);
else
return a2 * d + 255 * (a1 - a2);
return a2 * d / 255.0 + (a1 - a2);
//alternative? return std::sqrt(a1 * a2 * square(DistYCbCrBuffer::dist(pix1, pix2)) + square(255 * (a1 - a2)));
}