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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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dsp/core/twixt8.h Normal file
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#ifndef COSMOPOLITAN_DSP_CORE_TWIXT8_H_
#define COSMOPOLITAN_DSP_CORE_TWIXT8_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/**
* 8-bit linear interpolation kernel.
*/
static inline pureconst artificial unsigned char twixt8(unsigned char al,
unsigned char bl,
unsigned char p) {
short bx;
bx = bl;
bx -= al;
bx *= p;
bx >>= 8;
bx += al;
al = bx;
return al;
}
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_DSP_CORE_TWIXT8_H_ */