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core_pe: Tried to improve speed of that newly converted cache module.

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This commit is contained in:
Virgil Dupras 2010-01-30 16:50:49 +01:00
parent 7ec64e8a3d
commit cc362deb87
1 changed files with 30 additions and 13 deletions
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43
core_pe/modules/cache/cache.c vendored
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@ -4,14 +4,37 @@
*/ */
#include "Python.h" #include "Python.h"
#include "structmember.h" #include "structmember.h"
#include "stdio.h"
#include "stdlib.h"
/* I know that there strtol out there, but it requires a pointer to
* a char, which would in turn require me to buffer my chars around,
* making the whole process slower.
*/
static inline long
xchar_to_long(char c)
{
if ((c >= 48) && (c <= 57)) { /* 0-9 */
return c - 48;
}
else if ((c >= 65) && (c <= 70)) { /* A-F */
return c - 55;
}
else if ((c >= 97) && (c <= 102)) { /* a-f */
return c - 87;
}
return 0;
}
static PyObject* static PyObject*
cache_string_to_colors(PyObject *self, PyObject *args) cache_string_to_colors(PyObject *self, PyObject *args)
{ {
char *s; char *s;
Py_ssize_t char_count;
PyObject *result; PyObject *result;
int i;
if (!PyArg_ParseTuple(args, "s", &s)) { if (!PyArg_ParseTuple(args, "s#", &s, &char_count)) {
return NULL; return NULL;
} }
@ -20,21 +43,15 @@ cache_string_to_colors(PyObject *self, PyObject *args)
return NULL; return NULL;
} }
while (*s) { char_count = (char_count / 6) * 6;
long r, g, b, whole_color; for (i=0; i<char_count; i+=6) {
char buffer[7]; long r, g, b;
PyObject *color_tuple; PyObject *color_tuple;
PyObject *pi; PyObject *pi;
strncpy(buffer, s, 6); r = (xchar_to_long(s[i]) << 4) + xchar_to_long(s[i+1]);
if (strlen(buffer) < 6) { /* incomplete color, terminate loop */ g = (xchar_to_long(s[i+2]) << 4) + xchar_to_long(s[i+3]);
break; b = (xchar_to_long(s[i+4]) << 4) + xchar_to_long(s[i+5]);
}
s += 6;
whole_color = strtol(buffer, NULL, 16);
r = whole_color >> 16;
g = (whole_color >> 8) & 0xff;
b = whole_color & 0xff;
color_tuple = PyTuple_New(3); color_tuple = PyTuple_New(3);
pi = PyInt_FromLong(r); pi = PyInt_FromLong(r);