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89 lines
3.5 KiB
C
89 lines
3.5 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2007 *
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* by the Xiph.Org Foundation http://www.xiph.org/ *
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* *
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********************************************************************
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function:
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last mod: $Id: ocintrin.h 13884 2007-09-22 08:38:10Z giles $
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********************************************************************/
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/*Some common macros for potential platform-specific optimization.*/
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#include <math.h>
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#if !defined(_ocintrin_H)
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# define _ocintrin_H (1)
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/*Some specific platforms may have optimized intrinsic or inline assembly
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versions of these functions which can substantially improve performance.
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We define macros for them to allow easy incorporation of these non-ANSI
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features.*/
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/*Branchless, but not correct for differences larger than INT_MAX.
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static int oc_mini(int _a,int _b){
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int ambsign;
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ambsign=_a-_b>>sizeof(int)*8-1;
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return (_a&~ambsign)+(_b&ambsign);
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}*/
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#define OC_MAXI(_a,_b) ((_a)<(_b)?(_b):(_a))
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#define OC_MINI(_a,_b) ((_a)>(_b)?(_b):(_a))
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/*Clamps an integer into the given range.
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If _a>_c, then the lower bound _a is respected over the upper bound _c (this
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behavior is required to meet our documented API behavior).
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_a: The lower bound.
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_b: The value to clamp.
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_c: The upper boud.*/
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#define OC_CLAMPI(_a,_b,_c) (OC_MAXI(_a,OC_MINI(_b,_c)))
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#define OC_CLAMP255(_x) ((unsigned char)((((_x)<0)-1)&((_x)|-((_x)>255))))
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/*Divides an integer by a power of two, truncating towards 0.
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_dividend: The integer to divide.
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_shift: The non-negative power of two to divide by.
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_rmask: (1<<_shift)-1*/
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#define OC_DIV_POW2(_dividend,_shift,_rmask)\
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((_dividend)+(((_dividend)>>sizeof(_dividend)*8-1)&(_rmask))>>(_shift))
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/*Divides _x by 65536, truncating towards 0.*/
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#define OC_DIV2_16(_x) OC_DIV_POW2(_x,16,0xFFFF)
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/*Divides _x by 2, truncating towards 0.*/
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#define OC_DIV2(_x) OC_DIV_POW2(_x,1,0x1)
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/*Divides _x by 8, truncating towards 0.*/
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#define OC_DIV8(_x) OC_DIV_POW2(_x,3,0x7)
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/*Divides _x by 16, truncating towards 0.*/
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#define OC_DIV16(_x) OC_DIV_POW2(_x,4,0xF)
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/*Right shifts _dividend by _shift, adding _rval, and subtracting one for
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negative dividends first..
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When _rval is (1<<_shift-1), this is equivalent to division with rounding
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ties towards positive infinity.*/
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#define OC_DIV_ROUND_POW2(_dividend,_shift,_rval)\
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((_dividend)+((_dividend)>>sizeof(_dividend)*8-1)+(_rval)>>(_shift))
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/*Swaps two integers _a and _b if _a>_b.*/
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#define OC_SORT2I(_a,_b)\
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if((_a)>(_b)){\
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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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/*All of these macros should expect floats as arguments.*/
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#define OC_MAXF(_a,_b) ((_a)<(_b)?(_b):(_a))
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#define OC_MINF(_a,_b) ((_a)>(_b)?(_b):(_a))
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#define OC_CLAMPF(_a,_b,_c) (OC_MINF(_a,OC_MAXF(_b,_c)))
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#define OC_FABSF(_f) ((float)fabs(_f))
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#define OC_SQRTF(_f) ((float)sqrt(_f))
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#define OC_POWF(_b,_e) ((float)pow(_b,_e))
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#define OC_LOGF(_f) ((float)log(_f))
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#define OC_IFLOORF(_f) ((int)floor(_f))
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#define OC_ICEILF(_f) ((int)ceil(_f))
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#endif
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