mirror of
https://github.com/jart/cosmopolitan.git
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fa20edc44d
- Remove most __ASSEMBLER__ __LINKER__ ifdefs - Rename libc/intrin/bits.h to libc/serialize.h - Block pthread cancelation in fchmodat() polyfill - Remove `clang-format off` statements in third_party
24 lines
553 B
C
24 lines
553 B
C
#ifndef COSMOPOLITAN_DSP_CORE_C1331S_H_
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#define COSMOPOLITAN_DSP_CORE_C1331S_H_
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/**
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* Byte sized kernel for resampling difference samples in half.
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*
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* @define (1*(a-128)+3*(a-128)+3*(a-128)+1*(a-128))/(1+3+3+1)+128
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* @see C1331(), Y420CbCr2RgbScale()
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*/
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__funline signed char C1331S(signed char al, signed char bl, signed char cl,
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signed char dl) {
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short ax, bx;
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bx = bl;
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bx += cl;
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bx *= 3;
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ax = al;
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ax += dl;
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ax += bx;
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ax += 4;
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ax >>= 3;
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return ax;
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}
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#endif /* COSMOPOLITAN_DSP_CORE_C1331S_H_ */
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