The change below i think would complicate the usage.
Since every time accessing the interpolator the coordinates for
accessing should be ajusted by the value of x, y.
*GeglSampler *sampler = g_object_new (GEGL_TYPE_SAMPLER_CUBIC,
"input", src,
"format", babl_format ("RaGaBaA float"),
"x", 50,
"y", 50,
"width", 200, /* or a rect could be passed, or a subbuffer of
"height", 200, buffer expected to be created before making a sampler */
NULL);
The api below would introduce more complexity because each
implementation would need other arguments.
gegl_sampler_get_quad (sampler, xc-0.5, yc-0.5,
xc+0.5, yc-0.5,
xc+0.5, yc+0.5,
xc-0.5, yc+0.5,
buf);
The curren API proposal works on the complete passed buffer and should alos work for scaling and transforming.
Since the fractional part of x,y determines the offset.
void
affine_cubic (GeglBuffer *dest,
GeglBuffer *src,
Matrix3 matrix)
{
gdouble arecip;
gint x, y,
i, j,
pos,
src_w = src->width,
src_h = src->height,
u,
u1 = src->x,
u2 = src_w - 1,
pu,
v,
v1 = src->y,
v2 = src_h - 1,
pv;
gfloat *src_buf,
*dest_buf,
*src_ptr,
*dest_ptr,
abyss = 0.;
gdouble newval[4];
gdouble data[64];
gdouble du, dv, fu, fv;
Matrix3 inverse;
if (gegl_buffer_pixels (src) == 0 ||
gegl_buffer_pixels (dest) == 0)
return;
dest_buf = g_new (gfloat, gegl_buffer_pixels (dest) << 2);
g_assert (src_buf && dest_buf);
GeglInterpolatorCubic sampler = g_object_new (GEGL_TYPE_INTERPOLATOR_CUBIC,
"input", src,
"format", babl_format ("RaGaBaA float"),
NULL);
matrix3_copy (inverse, matrix);
matrix3_invert (inverse);
fu = du = inverse[0][0] * dest->x + inverse[0][1] * dest->y
+ inverse[0][2] - src->x;
fv = dv = inverse[1][0] * dest->x + inverse[1][1] * dest->y
+ inverse[1][2] - src->y;
for (dest_ptr = dest_buf, y = 0; y < dest->height; y++)
{
for (x = 0; x < dest->width; x++)
{
gegl_interpolator_get (interpolator, fu, fv,dest_buf);
fu += inverse [0][0];
fv += inverse [1][0];
}
du += inverse [0][1];
dv += inverse [1][1];
fu = du;
fv = dv;
}
gegl_buffer_set_fmt (dest, dest_buf, babl_format ("RaGaBaA float"));
g_free (dest_buf);
}
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