# pil / _imagingmath.c

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256``` ```/* * The Python Imaging Library * \$Id: _imagingmath.c 2396 2005-05-07 09:17:22Z Fredrik \$ * * a simple math add-on for the Python Imaging Library * * history: * 1999-02-15 fl Created * 2005-05-05 fl Simplified and cleaned up for PIL 1.1.6 * * Copyright (c) 1999-2005 by Secret Labs AB * Copyright (c) 2005 by Fredrik Lundh * * See the README file for information on usage and redistribution. */ #include "Python.h" #include "Imaging.h" #include "math.h" #include "float.h" #define UNOP(name, op, type)\ void name(Imaging out, Imaging im1)\ {\ int x, y;\ for (y = 0; y < out->ysize; y++) {\ type* p0 = (type*) out->image[y];\ type* p1 = (type*) im1->image[y];\ for (x = 0; x < out->xsize; x++) {\ *p0 = op(type, *p1);\ p0++; p1++;\ }\ }\ } #define BINOP(name, op, type)\ void name(Imaging out, Imaging im1, Imaging im2)\ {\ int x, y;\ for (y = 0; y < out->ysize; y++) {\ type* p0 = (type*) out->image[y];\ type* p1 = (type*) im1->image[y];\ type* p2 = (type*) im2->image[y];\ for (x = 0; x < out->xsize; x++) {\ *p0 = op(type, *p1, *p2);\ p0++; p1++; p2++;\ }\ }\ } #define NEG(type, v1) -(v1) #define INVERT(type, v1) ~(v1) #define ADD(type, v1, v2) (v1)+(v2) #define SUB(type, v1, v2) (v1)-(v2) #define MUL(type, v1, v2) (v1)*(v2) #define MIN(type, v1, v2) ((v1)<(v2))?(v1):(v2) #define MAX(type, v1, v2) ((v1)>(v2))?(v1):(v2) #define AND(type, v1, v2) (v1)&(v2) #define OR(type, v1, v2) (v1)|(v2) #define XOR(type, v1, v2) (v1)^(v2) #define LSHIFT(type, v1, v2) (v1)<<(v2) #define RSHIFT(type, v1, v2) (v1)>>(v2) #define ABS_I(type, v1) abs((v1)) #define ABS_F(type, v1) fabs((v1)) /* -------------------------------------------------------------------- * some day, we should add FPE protection mechanisms. see pyfpe.h for * details. * * PyFPE_START_PROTECT("Error in foobar", return 0) * PyFPE_END_PROTECT(result) */ #define DIV_I(type, v1, v2) ((v2)!=0)?(v1)/(v2):0 #define DIV_F(type, v1, v2) ((v2)!=0.0F)?(v1)/(v2):0.0F #define MOD_I(type, v1, v2) ((v2)!=0)?(v1)%(v2):0 #define MOD_F(type, v1, v2) ((v2)!=0.0F)?fmod((v1),(v2)):0.0F #define DIFF_I(type, v1, v2) abs((v1)-(v2)) #define DIFF_F(type, v1, v2) fabs((v1)-(v2)) #define EQ(type, v1, v2) (v1)==(v2) #define NE(type, v1, v2) (v1)!=(v2) #define LT(type, v1, v2) (v1)<(v2) #define LE(type, v1, v2) (v1)<=(v2) #define GT(type, v1, v2) (v1)>(v2) #define GE(type, v1, v2) (v1)>=(v2) UNOP(abs_I, ABS_I, INT32) UNOP(neg_I, NEG, INT32) BINOP(add_I, ADD, INT32) BINOP(sub_I, SUB, INT32) BINOP(mul_I, MUL, INT32) BINOP(div_I, DIV_I, INT32) BINOP(mod_I, MOD_I, INT32) BINOP(diff_I, DIFF_I, INT32) UNOP(invert_I, INVERT, INT32) BINOP(and_I, AND, INT32) BINOP(or_I, OR, INT32) BINOP(xor_I, XOR, INT32) BINOP(lshift_I, LSHIFT, INT32) BINOP(rshift_I, RSHIFT, INT32) BINOP(min_I, MIN, INT32) BINOP(max_I, MAX, INT32) BINOP(eq_I, EQ, INT32) BINOP(ne_I, NE, INT32) BINOP(lt_I, LT, INT32) BINOP(le_I, LE, INT32) BINOP(gt_I, GT, INT32) BINOP(ge_I, GE, INT32) UNOP(abs_F, ABS_F, FLOAT32) UNOP(neg_F, NEG, FLOAT32) BINOP(add_F, ADD, FLOAT32) BINOP(sub_F, SUB, FLOAT32) BINOP(mul_F, MUL, FLOAT32) BINOP(div_F, DIV_F, FLOAT32) BINOP(mod_F, MOD_F, FLOAT32) BINOP(diff_F, DIFF_F, FLOAT32) BINOP(min_F, MIN, FLOAT32) BINOP(max_F, MAX, FLOAT32) BINOP(eq_F, EQ, FLOAT32) BINOP(ne_F, NE, FLOAT32) BINOP(lt_F, LT, FLOAT32) BINOP(le_F, LE, FLOAT32) BINOP(gt_F, GT, FLOAT32) BINOP(ge_F, GE, FLOAT32) static PyObject * _unop(PyObject* self, PyObject* args) { Imaging out; Imaging im1; void (*unop)(Imaging, Imaging); long op, i0, i1; if (!PyArg_ParseTuple(args, "lll", &op, &i0, &i1)) return NULL; out = (Imaging) i0; im1 = (Imaging) i1; unop = (void*) op; unop(out, im1); Py_INCREF(Py_None); return Py_None; } static PyObject * _binop(PyObject* self, PyObject* args) { Imaging out; Imaging im1; Imaging im2; void (*binop)(Imaging, Imaging, Imaging); long op, i0, i1, i2; if (!PyArg_ParseTuple(args, "llll", &op, &i0, &i1, &i2)) return NULL; out = (Imaging) i0; im1 = (Imaging) i1; im2 = (Imaging) i2; binop = (void*) op; binop(out, im1, im2); Py_INCREF(Py_None); return Py_None; } static PyMethodDef _functions[] = { {"unop", _unop, 1}, {"binop", _binop, 1}, {NULL, NULL} }; static void install(PyObject *d, char* name, void* value) { PyObject *v = PyInt_FromLong((long) value); if (!v || PyDict_SetItemString(d, name, v)) PyErr_Clear(); Py_XDECREF(v); } DL_EXPORT(void) init_imagingmath(void) { PyObject* m; PyObject* d; m = Py_InitModule("_imagingmath", _functions); d = PyModule_GetDict(m); install(d, "abs_I", abs_I); install(d, "neg_I", neg_I); install(d, "add_I", add_I); install(d, "sub_I", sub_I); install(d, "diff_I", diff_I); install(d, "mul_I", mul_I); install(d, "div_I", div_I); install(d, "mod_I", mod_I); install(d, "min_I", min_I); install(d, "max_I", max_I); install(d, "invert_I", invert_I); install(d, "and_I", and_I); install(d, "or_I", or_I); install(d, "xor_I", xor_I); install(d, "lshift_I", lshift_I); install(d, "rshift_I", rshift_I); install(d, "eq_I", eq_I); install(d, "ne_I", ne_I); install(d, "lt_I", lt_I); install(d, "le_I", le_I); install(d, "gt_I", gt_I); install(d, "ge_I", ge_I); install(d, "abs_F", abs_F); install(d, "neg_F", neg_F); install(d, "add_F", add_F); install(d, "sub_F", sub_F); install(d, "diff_F", diff_F); install(d, "mul_F", mul_F); install(d, "div_F", div_F); install(d, "mod_F", mod_F); install(d, "min_F", min_F); install(d, "max_F", max_F); install(d, "eq_F", eq_F); install(d, "ne_F", ne_F); install(d, "lt_F", lt_F); install(d, "le_F", le_F); install(d, "gt_F", gt_F); install(d, "ge_F", ge_F); } ```