From 2dddcbf41dc1c37b937150b75b3a3648846e4bfe Mon Sep 17 00:00:00 2001 From: peres Date: Sat, 7 May 2011 08:38:32 +0900 Subject: GRAPHICS: implement the long awaited interpolate16_5_3 --- graphics/scaler/intern.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/graphics/scaler/intern.h b/graphics/scaler/intern.h index 4addd6d3bd..7317745e62 100644 --- a/graphics/scaler/intern.h +++ b/graphics/scaler/intern.h @@ -76,6 +76,16 @@ static inline unsigned interpolate16_3_1(unsigned p1, unsigned p2) { 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 +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. */ -- cgit v1.2.3