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GRAPHICS: implement the long awaited interpolate16_5_3

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This commit is contained in:
peres 2011-05-07 08:38:32 +09:00
parent 99da647e8f
commit 2dddcbf41d
1 changed files with 10 additions and 0 deletions
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10
graphics/scaler/intern.h
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@ -76,6 +76,16 @@ static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) {
return ((p1*3 + p2) - lowbits) >> 2; return ((p1*3 + p2) - lowbits) >> 2;
} }
/**
* Interpolate two 16 bit pixels with weights 5 and 3 and 1, i.e., (5*p1+3*p2)/8.
*/
template<typename ColorMask>
static inline unsigned interpolate16_5_3(unsigned p1, unsigned p2) {
const unsigned lowbits = (((p1 & ColorMask::kLowBits) << 2) + (p1 & ColorMask::kLow3Bits)
+ ((p2 & ColorMask::kLow2Bits) << 1) + (p2 & ColorMask::kLow3Bits)) & ColorMask::kLow3Bits;
return ((p1*5 + p2*3) - lowbits) >> 3;
}
/** /**
* Interpolate two 16 bit pixels with weights 7 and 1, i.e., (7*p1+p2)/8. * Interpolate two 16 bit pixels with weights 7 and 1, i.e., (7*p1+p2)/8.
*/ */