/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011 Michael Muré <batolettre@gmail.com>
*
*/
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_double (scaling, _("Scaling"), 0.0, 5000.0, 1.0,
_("scaling factor of displacement, indicates how large spatial"
" displacement a relative mapping value of 1.0 corresponds to."))
gegl_chant_enum (sampler_type, _("Sampler"), GeglSamplerType, GEGL_TYPE_SAMPLER_TYPE,
GEGL_SAMPLER_CUBIC, _("Sampler used internaly"))
#else
#define GEGL_CHANT_TYPE_COMPOSER
#define GEGL_CHANT_C_FILE "map-relative.c"
#include "config.h"
#include <glib/gi18n-lib.h>
#include "gegl-chant.h"
static void
prepare (GeglOperation *operation)
{
const Babl *format = babl_format ("RGBA float");
gegl_operation_set_format (operation, "input", format);
gegl_operation_set_format (operation, "aux", babl_format_n (babl_type ("float"), 2));
gegl_operation_set_format (operation, "output", format);
}
static GeglRectangle
get_required_for_output (GeglOperation *operation,
const gchar *input_pad,
const GeglRectangle *region)
{
GeglRectangle result = *gegl_operation_source_get_bounding_box (operation, "input");
return result;
}
static gboolean
process (GeglOperation *operation,
GeglBuffer *input,
GeglBuffer *aux,
GeglBuffer *output,
const GeglRectangle *result,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
const Babl *format_io, *format_coords;
GeglSampler *sampler;
GeglBufferIterator *it;
gint index_in, index_out, index_coords;
format_io = babl_format ("RGBA float");
format_coords = babl_format_n (babl_type ("float"), 2);
sampler = gegl_buffer_sampler_new (input, format_io, o->sampler_type);
if (aux != NULL)
{
it = gegl_buffer_iterator_new (output, result, level, format_io, GEGL_BUFFER_WRITE, GEGL_ABYSS_NONE);
index_out = 0;
index_coords = gegl_buffer_iterator_add (it, aux, result, level, format_coords, GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
index_in = gegl_buffer_iterator_add (it, input, result, level, format_io, GEGL_BUFFER_READ, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (it))
{
gint i;
gint n_pixels = it->length;
gint x = it->roi->x; /* initial x */
gint y = it->roi->y; /* and y coordinates */
gdouble scaling = GEGL_CHANT_PROPERTIES (operation)->scaling;
gfloat *in = it->data[index_in];
gfloat *out = it->data[index_out];
gfloat *coords = it->data[index_coords];
for (i=0; i<n_pixels; i++)
{
/* if the coordinate asked is an exact pixel, we fetch it
* directly, to avoid the blur of sampling */
if (coords[0] == 0 && coords[1] == 0)
{
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
out[3] = in[3];
}
else
{
gegl_sampler_get (sampler, x+coords[0] * scaling,
y+coords[1] * scaling,
NULL, out);
}
coords += 2;
in += 4;
out += 4;
/* update x and y coordinates */
x++;
if (x >= (it->roi->x + it->roi->width))
{
x = it->roi->x;
y++;
}
}
}
}
else
{
gegl_buffer_copy (input, result, output, result);
}
g_object_unref (sampler);
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationComposerClass *composer_class;
operation_class = GEGL_OPERATION_CLASS (klass);
composer_class = GEGL_OPERATION_COMPOSER_CLASS (klass);
composer_class->process = process;
operation_class->prepare = prepare;
operation_class->get_required_for_output = get_required_for_output;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:map-relative",
"categories" , "transform",
"description", _("sample input with an auxiliary buffer that contain relative source coordinates"),
NULL);
}
#endif