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Pillow/_imagingmath.c
Andrew Murray f00a70bc57 Removed powf support for older Python versions
2016-03-28 19:06:06 +11:00

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/*
* The Python Imaging Library
*
* 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 "py3.h"
#include "math.h"
#include "float.h"
#define MAX_INT32 2147483647.0
#define MIN_INT32 -2147483648.0
#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
static int powi(int x, int y)
{
double v = pow(x, y) + 0.5;
if (errno == EDOM)
return 0;
if (v < MIN_INT32)
v = MIN_INT32;
else if (v > MAX_INT32)
v = MAX_INT32;
return (int) v;
}
#define POW_I(type, v1, v2) powi(v1, v2)
#define POW_F(type, v1, v2) powf(v1, v2) /* FIXME: EDOM handling */
#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(pow_I, POW_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(pow_F, POW_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);
Py_ssize_t op, i0, i1;
if (!PyArg_ParseTuple(args, "nnn", &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);
Py_ssize_t op, i0, i1, i2;
if (!PyArg_ParseTuple(args, "nnnn", &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_FromSsize_t((Py_ssize_t) value);
if (!v || PyDict_SetItemString(d, name, v))
PyErr_Clear();
Py_XDECREF(v);
}
static int
setup_module(PyObject* m) {
PyObject* 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, "pow_I", pow_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, "pow_F", pow_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);
return 0;
}
#if PY_VERSION_HEX >= 0x03000000
PyMODINIT_FUNC
PyInit__imagingmath(void) {
PyObject* m;
static PyModuleDef module_def = {
PyModuleDef_HEAD_INIT,
"_imagingmath", /* m_name */
NULL, /* m_doc */
-1, /* m_size */
_functions, /* m_methods */
};
m = PyModule_Create(&module_def);
if (setup_module(m) < 0)
return NULL;
return m;
}
#else
PyMODINIT_FUNC
init_imagingmath(void)
{
PyObject* m = Py_InitModule("_imagingmath", _functions);
setup_module(m);
}
#endif
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