31 lines
746 B
C
31 lines
746 B
C
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#ifndef COSMOPOLITAN_DSP_CORE_C331_H_
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#define COSMOPOLITAN_DSP_CORE_C331_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* Fixed-point 8-bit magic edge resampling kernel.
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*
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* @define (3*a + 3*b + 1*c) / 7
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* @see C1331()
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*/
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static inline pureconst artificial unsigned char C331(unsigned char al,
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unsigned char bl,
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unsigned char cl) {
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unsigned eax, ebx, ecx;
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eax = al;
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ebx = bl;
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ecx = cl;
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eax += ebx;
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eax *= 3 * 2350;
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ecx *= 1 * 2350;
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eax += ecx;
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eax >>= 14;
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al = eax;
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return al;
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_DSP_CORE_C331_H_ */
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