52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
#if !defined(_qrcode_util_H)
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# define _qrcode_util_H (1)
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#define QR_MAXI(_a,_b) ((_a)-((_a)-(_b)&-((_b)>(_a))))
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#define QR_MINI(_a,_b) ((_a)+((_b)-(_a)&-((_b)<(_a))))
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#define QR_SIGNI(_x) (((_x)>0)-((_x)<0))
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#define QR_SIGNMASK(_x) (-((_x)<0))
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/*Unlike copysign(), simply inverts the sign of _a if _b is negative.*/
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#define QR_FLIPSIGNI(_a,_b) ((_a)+QR_SIGNMASK(_b)^QR_SIGNMASK(_b))
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#define QR_COPYSIGNI(_a,_b) QR_FLIPSIGNI(abs(_a),_b)
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/*Divides a signed integer by a positive value with exact rounding.*/
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#define QR_DIVROUND(_x,_y) (((_x)+QR_FLIPSIGNI(_y>>1,_x))/(_y))
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#define QR_CLAMPI(_a,_b,_c) (QR_MAXI(_a,QR_MINI(_b,_c)))
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#define QR_CLAMP255(_x) ((unsigned char)((((_x)<0)-1)&((_x)|-((_x)>255))))
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#define QR_SWAP2I(_a,_b) \
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do{ \
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int t__; \
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t__=(_a); \
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(_a)=(_b); \
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(_b)=t__; \
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} \
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while(0)
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/*Swaps two integers _a and _b if _a>_b.*/
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#define QR_SORT2I(_a,_b) \
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do{ \
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int t__; \
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t__=QR_MINI(_a,_b)^(_a); \
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(_a)^=t__; \
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(_b)^=t__; \
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} \
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while(0)
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#define QR_ILOG0(_v) (!!((_v)&0x2))
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#define QR_ILOG1(_v) (((_v)&0xC)?2+QR_ILOG0((_v)>>2):QR_ILOG0(_v))
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#define QR_ILOG2(_v) (((_v)&0xF0)?4+QR_ILOG1((_v)>>4):QR_ILOG1(_v))
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#define QR_ILOG3(_v) (((_v)&0xFF00)?8+QR_ILOG2((_v)>>8):QR_ILOG2(_v))
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#define QR_ILOG4(_v) (((_v)&0xFFFF0000)?16+QR_ILOG3((_v)>>16):QR_ILOG3(_v))
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/*Computes the integer logarithm of a (positive, 32-bit) constant.*/
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#define QR_ILOG(_v) ((int)QR_ILOG4((unsigned)(_v)))
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/*Multiplies 32-bit numbers _a and _b, adds (possibly 64-bit) number _r, and
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takes bits [_s,_s+31] of the result.*/
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#define QR_FIXMUL(_a,_b,_r,_s) ((int)((_a)*(long long)(_b)+(_r)>>(_s)))
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/*Multiplies 32-bit numbers _a and _b, adds (possibly 64-bit) number _r, and
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gives all 64 bits of the result.*/
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#define QR_EXTMUL(_a,_b,_r) ((_a)*(long long)(_b)+(_r))
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unsigned qr_isqrt(unsigned _val);
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unsigned qr_ihypot(int _x,int _y);
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int qr_ilog(unsigned _val);
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#endif
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