/* 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 2006 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#include <stdlib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_int_ui (x, _("Width"), 1, G_MAXINT, 16, 1, 256, 1.5,
_("Horizontal width of cells pixels"))
gegl_chant_int_ui (y, _("Height"), 1, G_MAXINT, 16, 1, 256, 1.5,
_("Vertical width of cells in pixels"))
gegl_chant_int_ui (x_offset, _("X offset"), -G_MAXINT, G_MAXINT, 0, -10, 10, 1.0,
_("Horizontal offset (from origin) for start of grid"))
gegl_chant_int_ui (y_offset, _("Y offset"), -G_MAXINT, G_MAXINT, 0, -10, 10, 1.0,
_("Vertical offset (from origin) for start of grid"))
gegl_chant_color (color1, _("Color"), "black",
_("One of the cell colors (defaults to 'black')"))
gegl_chant_color (color2, _("Other color"), "white",
_("The other cell color (defaults to 'white')"))
#else
#define GEGL_CHANT_TYPE_POINT_RENDER
#define GEGL_CHANT_C_FILE "checkerboard.c"
#include "gegl-chant.h"
static void
prepare (GeglOperation *operation)
{
gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
}
static GeglRectangle
get_bounding_box (GeglOperation *operation)
{
return gegl_rectangle_infinite_plane ();
}
static gboolean
process (GeglOperation *operation,
void *out_buf,
glong n_pixels,
const GeglRectangle *roi,
gint level)
{
GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
gfloat *out_pixel = out_buf;
gfloat color1[4];
gfloat color2[4];
gint x = roi->x; /* initial x */
gint y = roi->y; /* and y coordinates */
gegl_color_get_pixel (o->color1, babl_format ("RGBA float"), color1);
gegl_color_get_pixel (o->color2, babl_format ("RGBA float"), color2);
while (n_pixels--)
{
gint nx,ny;
if ((x - o->x_offset) < 0)
{
nx = div (x - o->x_offset + 1, o->x).quot;
}
else
{
nx = div (x - o->x_offset, o->x).quot;
}
if ((y - o->y_offset) < 0)
{
ny = div (y - o->y_offset + 1, o->y).quot;
}
else
{
ny = div (y - o->y_offset, o->y).quot;
}
/* shift negative cell indices */
nx -= (x - o->x_offset) < 0 ? 1 : 0;
ny -= (y - o->y_offset) < 0 ? 1 : 0;
if ( (nx+ny) % 2 == 0)
{
out_pixel[0]=color1[0];
out_pixel[1]=color1[1];
out_pixel[2]=color1[2];
out_pixel[3]=color1[3];
}
else
{
out_pixel[0]=color2[0];
out_pixel[1]=color2[1];
out_pixel[2]=color2[2];
out_pixel[3]=color2[3];
}
out_pixel += 4;
/* update x and y coordinates */
x++;
if (x>=roi->x + roi->width)
{
x=roi->x;
y++;
}
}
return TRUE;
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointRenderClass *point_render_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_render_class = GEGL_OPERATION_POINT_RENDER_CLASS (klass);
point_render_class->process = process;
operation_class->get_bounding_box = get_bounding_box;
operation_class->prepare = prepare;
gegl_operation_class_set_keys (operation_class,
"name", "gegl:checkerboard",
"categories", "render",
"description", _("Checkerboard renderer"),
NULL);
}
#endif