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/* This file is an image processing operation for GEGL
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*
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* GEGL is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* GEGL is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
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*/
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#include "config.h"
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#include <glib/gi18n-lib.h>
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#ifdef GEGL_CHANT_PROPERTIES
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gegl_chant_int_ui (x, _("Width"), 1, G_MAXINT, 32, 1, 128, 1.0,
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_("Horizontal width of cells pixels"))
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gegl_chant_int_ui (y, _("Height"), 1, G_MAXINT, 32, 1, 128, 1.0,
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_("Vertical width of cells in pixels"))
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gegl_chant_int_ui (x_offset, _("X offset"), -G_MAXINT, G_MAXINT, 0, -64, 64, 1.0,
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_("Horizontal offset (from origin) for start of grid"))
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gegl_chant_int_ui (y_offset, _("Y offset"), -G_MAXINT, G_MAXINT, 0, -64, 64, 1.0,
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_("Vertical offset (from origin) for start of grid"))
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gegl_chant_int_ui (line_width, _("Line Width"), 0, G_MAXINT, 4, 0, 16, 1.0,
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_("Width of grid lines in pixels"))
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gegl_chant_int_ui (line_height, _("Line Height"), 0, G_MAXINT, 4, 0, 16, 1.0,
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_("Height of grid lines in pixels"))
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gegl_chant_color (line_color, _("Color"), "black",
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_("Color of the grid lines"))
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#else
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#define GEGL_CHANT_TYPE_POINT_RENDER
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#define GEGL_CHANT_C_FILE "grid.c"
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#include "gegl-chant.h"
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static void
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prepare (GeglOperation *operation)
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{
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gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
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}
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static GeglRectangle
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get_bounding_box (GeglOperation *operation)
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{
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return gegl_rectangle_infinite_plane ();
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}
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static gboolean
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process (GeglOperation *operation,
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void *out_buf,
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glong n_pixels,
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const GeglRectangle *roi,
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gint level)
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{
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GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
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gfloat *out_pixel = out_buf;
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gfloat line_color[4];
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gint x = roi->x; /* initial x */
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gint y = roi->y; /* and y coordinates */
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gegl_color_get_pixel (o->line_color, babl_format ("RGBA float"), line_color);
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while (n_pixels--)
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{
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gint nx,ny;
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nx = (x - o->x_offset) % o->x;
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ny = (y - o->y_offset) % o->y;
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/* handle case where % returns a negative number */
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nx += nx < 0 ? o->x : 0;
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ny += ny < 0 ? o->y : 0;
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if (nx < o->line_width || ny < o->line_height)
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{
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out_pixel[0]=line_color[0];
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out_pixel[1]=line_color[1];
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out_pixel[2]=line_color[2];
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out_pixel[3]=line_color[3];
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}
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else
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{
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out_pixel[0]=0.0f;
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out_pixel[1]=0.0f;
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out_pixel[2]=0.0f;
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out_pixel[3]=0.0f;
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}
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out_pixel += 4;
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/* update x and y coordinates */
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x++;
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if (x>=roi->x + roi->width)
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{
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x=roi->x;
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y++;
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}
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}
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return TRUE;
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}
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static void
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gegl_chant_class_init (GeglChantClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointRenderClass *point_render_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_render_class = GEGL_OPERATION_POINT_RENDER_CLASS (klass);
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point_render_class->process = process;
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operation_class->get_bounding_box = get_bounding_box;
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operation_class->prepare = prepare;
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gegl_operation_class_set_keys (operation_class,
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"name" , "gegl:grid",
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"categories" , "render",
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"description", _("Grid renderer"),
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NULL);
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}
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#endif
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