On 10/15/06, Geert Jordaens <geert.jordaens@xxxxxxxxxx> wrote:
I've added the implementation to bug report : Bug 360888 – Interpolation
snip
usage :
snip
Maybe something along the following lines would be a better API?
/Øyvind K.
void
displacementmap (GeglBuffer *src,
GeglBuffer *aux,
GeglBuffer *dst,
gdouble scale,
gint cx,
gint cy)
{
gint i, j;
gint dst_pos=0;
gfloat *buf = g_malloc0 (4 * 4 * 4);
gfloat *aux_buf = g_malloc0 (aux->width * aux->height * 4 * 4);
gfloat *dst_buf = g_malloc0 (dst->width * dst->height * 4 * 4);
gegl_buffer_get_fmt (aux, aux_buf, babl_format ("RGBA float"));
gegl_buffer_get_fmt (dst, dst_buf, babl_format ("RaGaBaA float"));
*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);
for (i = 0; i < src->height; i++)
for (j = 0; j < src->width; j++)
{
gdouble dx, dy, xc, yc;
/* Calculate x/y - offset relative to origin */
dx = (gdouble) j / (src->width-1.0);
dy = (gdouble) i / (src->height-1.0);
xc = j + (gint) (displacement (aux, aux_buf, dx, dy, cx) * scale);
yc = i + (gint) (displacement (aux, aux_buf, dx, dy, cy) * scale);
/* returns a freshly sampled pixel in dst */
gegl_sampler_get (sampler, xc, yc, buf);
#if 0
/* using this form, might make more sense, since it would allow accurate
sampling as needed by affine/perspective transforms that are scaling
down as well as when scaling up/interpolating
*/
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);
#endif
{
int component;
for (component = 0 ; component < 4 ; component++)
dst_buf[dst_pos+component]= buf[component];
}
dst_pos+=4;
}
gegl_buffer_set_fmt (dst, dst_buf, babl_format ("RaGaBaA float"));
g_object_unref (sampler);
g_free (aux_buf);
g_free (dst_buf);
}
--
«The future is already here. It's just not very evenly distributed»
-- William Gibson
http://pippin.gimp.org/ http://ffii.org/
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