Here are two GEGL sharpen filters I made. They work fine.
but I have another filter I made "stroke ouline" and I want to give it multiple outlines but don't know how
The c file is here so maybe someone can tinker with it and make multiple outlines like this.
/* 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 <https://www.gnu.org/licenses/>.
*
* Copyright 2006, 2010 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_PROPERTIES
/* Should correspond to GeglMedianBlurNeighborhood in median-blur.c */
enum_start (gegl_stroke_grow_shape)
enum_value (GEGL_stroke_GROW_SHAPE_SQUARE, "square", N_("Square"))
enum_value (GEGL_stroke_GROW_SHAPE_CIRCLE, "circle", N_("Circle"))
enum_value (GEGL_stroke_GROW_SHAPE_DIAMOND, "diamond", N_("Diamond"))
enum_end (GeglstrokeGrowShape)
property_double (radius, _("Blur radius"), 10.0)
value_range (0.0, 2)
ui_range (0.0, 300.0)
ui_steps (1, 5)
ui_gamma (1.5)
ui_meta ("unit", "pixel-distance")
property_enum (grow_shape, _("Grow shape"),
GeglstrokeGrowShape, gegl_stroke_grow_shape,
GEGL_stroke_GROW_SHAPE_CIRCLE)
description (_("The shape to expand or contract the stroke in"))
property_double (grow_radius, _("Grow radius"), 12.0)
value_range (-100.0, 100.0)
ui_range (-50.0, 50.0)
ui_digits (0)
ui_steps (1, 5)
ui_gamma (1.5)
ui_meta ("unit", "pixel-distance")
description (_("The distance to expand the stroke before blurring; a negative value will contract the stroke instead"))
property_color (color, _("Color"), "white")
/* TRANSLATORS: the string 'black' should not be translated */
description (_("The stroke's color (defaults to 'white')"))
/* It does make sense to sometimes have opacities > 1 (see GEGL logo
* for example)
*/
property_double (opacity, _("Opacity"), 1)
value_range (0.0, 2.0)
ui_steps (0.01, 0.10)
#else
#define GEGL_OP_META
#define GEGL_OP_NAME stroke
#define GEGL_OP_C_SOURCE stroke.c
#include "gegl-op.h"
typedef struct
{
GeglNode *input;
GeglNode *grow;
GeglNode *darken;
} State;
static void
update_graph (GeglOperation *operation)
{
GeglProperties *o = GEGL_PROPERTIES (operation);
State *state = o->user_data;
if (!state) return;
if (o->grow_radius > 0.0001)
{
gegl_node_link_many (state->input, state->grow, state->darken, NULL);
}
else
{
gegl_node_link_many (state->input, state->darken, NULL);
}
}
/* in attach we hook into graph adding the needed nodes */
static void
attach (GeglOperation *operation)
{
GeglProperties *o = GEGL_PROPERTIES (operation);
GeglNode *gegl = operation->node;
GeglNode *input, *output, *over, *translate, *opacity, *grow, *blur, *darken, *color;
GeglColor *black_color = gegl_color_new ("rgb(0.0,0.0,0.0)");
input = gegl_node_get_input_proxy (gegl, "input");
output = gegl_node_get_output_proxy (gegl, "output");
over = gegl_node_new_child (gegl, "operation", "gegl:over", NULL);
translate = gegl_node_new_child (gegl, "operation", "gegl:translate", NULL);
opacity = gegl_node_new_child (gegl, "operation", "gegl:opacity", NULL);
blur = gegl_node_new_child (gegl, "operation", "gegl:gaussian-blur",
"clip-extent", FALSE,
"abyss-policy", 0,
NULL);
grow = gegl_node_new_child (gegl, "operation", "gegl:median-blur",
"percentile", 100.0,
"alpha-percentile", 100.0,
"abyss-policy", GEGL_ABYSS_NONE,
NULL);
darken = gegl_node_new_child (gegl, "operation", "gegl:src-in", NULL);
color = gegl_node_new_child (gegl, "operation", "gegl:color",
"value", black_color,
NULL);
State *state = g_malloc0 (sizeof (State));
o->user_data = state;
state->input = input;
state->grow = grow;
state->darken = darken;
g_object_unref (black_color);
gegl_node_link_many (input, grow, darken, blur, opacity, translate, over, output,
NULL);
gegl_node_connect_from (over, "aux", input, "output");
gegl_node_connect_from (darken, "aux", color, "output");
gegl_operation_meta_redirect (operation, "grow-shape", grow, "neighborhood");
gegl_operation_meta_redirect (operation, "grow-radius", grow, "radius");
gegl_operation_meta_redirect (operation, "radius", blur, "std-dev-x");
gegl_operation_meta_redirect (operation, "radius", blur, "std-dev-y");
gegl_operation_meta_redirect (operation, "color", color, "value");
gegl_operation_meta_redirect (operation, "opacity", opacity, "value");
}
static void
dispose (GObject *object)
{
GeglProperties *o = GEGL_PROPERTIES (object);
g_clear_pointer (&o->user_data, g_free);
G_OBJECT_CLASS (gegl_op_parent_class)->dispose (object);
}
static void
gegl_op_class_init (GeglOpClass *klass)
{
GObjectClass *object_class;
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationMetaClass *operation_meta_class = GEGL_OPERATION_META_CLASS (klass);
operation_class->attach = attach;
operation_meta_class->update = update_graph;
object_class = G_OBJECT_CLASS (klass);
object_class->dispose = dispose;
gegl_operation_class_set_keys (operation_class,
"name", "gegl:stroke",
"title", _("stroke"),
"categories", "light",
"reference-hash", "1784365a0e801041189309f3a4866b1a",
"description",
_("Creates a stroke outline around images in transparency"),
NULL);
}
#endif
Lastly, I don't want to sound prejudice but I wish everyone made GEGL filters instead of using the legacy system.
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