00001 /** \file
00002  * \brief Math Operations
00003  *
00004  * See Copyright Notice in im_lib.h
00005  * $Id: im_math_op.h,v 1.1 2005/04/02 22:07:00 scuri Exp $
00006  */
00007 
00008 #ifndef __IM_MATH_OP_H
00009 #define __IM_MATH_OP_H
00010 
00011 #include "im_complex.h"
00012 
00013 //#define IM_NEARZERO 0.0000001f
00014 //#define IM_NEARINF   10000000
00015 
00016 /// Crop value to Byte limit
00017 template <class T>
00018 inline T crop_byte(const T& v)
00019 {
00020   return v <= 0? 0: v <= 255? v: 255;
00021 }
00022 
00023 /// Generic Addition with 2 template types
00024 template <class T1, class T2>
00025 inline T1 add_op(const T1& v1, const T2& v2)
00026 {
00027   return v2 + v1;
00028 }
00029 
00030 /// Generic Subtraction with 2 template types
00031 template <class T1, class T2>
00032 inline T1 sub_op(const T1& v1, const T2& v2)
00033 {
00034   return v2 - v1;
00035 }
00036 
00037 /// Generic Multiplication with 2 template types
00038 template <class T1, class T2>
00039 inline T1 mul_op(const T1& v1, const T2& v2)
00040 {
00041   return v2 * v1;
00042 }
00043 
00044 /// Generic Division with 2 template types
00045 template <class T1, class T2>
00046 inline T1 div_op(const T1& v1, const T2& v2)
00047 {
00048 //  if (v2 == 0) return (T1)IM_NEARINF;
00049   return v1 / v2;
00050 }
00051 
00052 /// Generic Invert
00053 template <class T>
00054 inline T inv_op(const T& v)
00055 {
00056 //  if (v == 0) return (T)IM_NEARINF;
00057   return 1/v;
00058 }
00059 
00060 /// Generic Difference with 2 template types
00061 template <class T1, class T2>
00062 inline T1 diff_op(const T1& v1, const T2& v2)
00063 {
00064   if (v1 <= v2)
00065     return v2 - v1;
00066   return v1 - v2;
00067 }
00068 
00069 /// Generic Minimum with 2 template types
00070 template <class T1, class T2>
00071 inline T1 min_op(const T1& v1, const T2& v2)
00072 {
00073   if (v1 <= v2)
00074     return v1;
00075   return v2;
00076 }
00077 
00078 /// Generic Maximum with 2 template types
00079 template <class T1, class T2>
00080 inline T1 max_op(const T1& v1, const T2& v2)
00081 {
00082   if (v1 <= v2)
00083     return v2;
00084   return v1;
00085 }
00086 
00087 /// Generic Power with 2 template types
00088 template <class T1, class T2>
00089 inline T1 pow_op(const T1& v1, const T2& v2)
00090 {
00091   return (T1)pow(v1, v2);
00092 }
00093 
00094 /// Generic Abssolute
00095 template <class T>
00096 inline T abs_op(const T& v)
00097 {
00098   if (v <= 0)
00099     return -1*v;
00100   return v;
00101 }
00102 
00103 /// Generic Less
00104 template <class T>
00105 inline T less_op(const T& v)
00106 {
00107   return -1*v;
00108 }
00109 
00110 /// Generic Square
00111 template <class T>
00112 inline T sqr_op(const T& v)
00113 {
00114   return v*v;
00115 }
00116 
00117 inline int sqrt(const int& C)
00118 {
00119   return (int)sqrt(float(C));
00120 }
00121 
00122 /// Generic Square Root
00123 template <class T>
00124 inline T sqrt_op(const T& v)
00125 {
00126   return (T)sqrt(v);
00127 }
00128 
00129 inline int exp(const int& v)
00130 {
00131   return (int)exp((float)v);
00132 }
00133 
00134 /// Generic Exponential
00135 template <class T>
00136 inline T exp_op(const T& v)
00137 {
00138   return (T)exp(v);
00139 }
00140 
00141 inline int log(const int& v)
00142 {
00143   return (int)log((float)v);
00144 }
00145 
00146 /// Generic Logarithm
00147 template <class T>
00148 inline T log_op(const T& v)
00149 {
00150 //  if (v <= 0) return (T)IM_NEARINF;
00151   return (T)log(v);
00152 }
00153 
00154 // Dummy sin
00155 inline imcfloat sin(const imcfloat& v)
00156 {
00157   return (v);
00158 }
00159 
00160 inline int sin(const int& v)
00161 {
00162   return (int)sin((float)v);
00163 }
00164 
00165 /// Generic Sine
00166 template <class T>
00167 inline T sin_op(const T& v)
00168 {
00169   return (T)sin(v);
00170 }
00171 
00172 inline int cos(const int& v)
00173 {
00174   return (int)cos((float)v);
00175 }
00176 
00177 // Dummy cos
00178 inline imcfloat cos(const imcfloat& v)
00179 {
00180   return (v);
00181 }
00182 
00183 /// Generic Cosine
00184 template <class T>
00185 inline T cos_op(const T& v)
00186 {
00187   return (T)cos(v);
00188 }
00189 
00190 /// Sets a bit in an array
00191 inline void imDataBitSet(imbyte* data, int index, int bit)
00192 {
00193   if (bit)
00194     data[index / 8] |=  (0x01 << (7 - (index % 8)));
00195   else
00196     data[index / 8] &= ~(0x01 << (7 - (index % 8)));
00197 }
00198 
00199 /// Gets a bit from an array
00200 inline int imDataBitGet(imbyte* data, int index)
00201 {
00202   return (data[index / 8] >> (7 - (index % 8))) & 0x01;
00203 }
00204 
00205 #endif