static PyObject *
pygimp_bilinear_color(PyObject *self, PyObject *args, PyObject *kwargs, gboolean with_alpha)
{
gdouble x, y;
GimpRGB values[4];
GimpRGB rgb;
PyObject *py_values, *v;
int i, success;
static char *kwlist[] = { "x", "y", "values", NULL };
if (!PyArg_ParseTupleAndKeywords(args, kwargs,
with_alpha ? "ddO:bilinear_rgba"
: "ddO:bilinear_rgb",
kwlist,
&x, &y, &py_values))
return NULL;
if (!PySequence_Check(py_values) || PySequence_Size(py_values) != 4) {
PyErr_SetString(PyExc_TypeError, "values is not a sequence of 4 items");
return NULL;
}
for (i = 0; i < 4; i++) {
v = PySequence_GetItem(py_values, i);
success = pygimp_rgb_from_pyobject(v, &values[i]);
Py_DECREF(v);
if (!success) {
PyErr_Format(PyExc_TypeError, "values[%d] is not a GimpRGB", i);
return NULL;
}
}
if (with_alpha)
rgb = gimp_bilinear_rgba(x, y, values);
else
rgb = gimp_bilinear_rgb(x, y, values);
return pygimp_rgb_new(&rgb);
}
static void
getpixel (GimpPixelRgn *src_rgn,
GimpRGB *p,
gdouble u,
gdouble v)
{
register gint x1, y1, x2, y2;
gint width, height;
static GimpRGB pp[4];
width = src_rgn->w;
height = src_rgn->h;
x1 = (gint)u;
y1 = (gint)v;
if (x1 < 0)
x1 = width - (-x1 % width);
else
x1 = x1 % width;
if (y1 < 0)
y1 = height - (-y1 % height);
else
y1 = y1 % height;
x2 = (x1 + 1) % width;
y2 = (y1 + 1) % height;
peek (src_rgn, x1, y1, &pp[0]);
peek (src_rgn, x2, y1, &pp[1]);
peek (src_rgn, x1, y2, &pp[2]);
peek (src_rgn, x2, y2, &pp[3]);
if (source_drw_has_alpha)
*p = gimp_bilinear_rgba (u, v, pp);
else
*p = gimp_bilinear_rgb (u, v, pp);
}
