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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationthresholdalpha.c
* Copyright (C) 2012 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Ported from the threshold-alpha plug-in
* Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
*/
#include "config.h"
#include <gegl.h>
#include "operations-types.h"
#include "gimpoperationthresholdalpha.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_VALUE
};
static void gimp_operation_threshold_alpha_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_operation_threshold_alpha_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_operation_threshold_alpha_prepare (GeglOperation *operation);
static gboolean gimp_operation_threshold_alpha_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (GimpOperationThresholdAlpha, gimp_operation_threshold_alpha,
GEGL_TYPE_OPERATION_POINT_FILTER)
#define parent_class gimp_operation_threshold_alpha_parent_class
static void
gimp_operation_threshold_alpha_class_init (GimpOperationThresholdAlphaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
object_class->set_property = gimp_operation_threshold_alpha_set_property;
object_class->get_property = gimp_operation_threshold_alpha_get_property;
gegl_operation_class_set_keys (operation_class,
"name", "gimp:threshold-alpha",
"categories", "color",
"description",
_("Make transparency all-or-nothing, by "
"thresholding the alpha channel to a value"),
NULL);
operation_class->prepare = gimp_operation_threshold_alpha_prepare;
point_class->process = gimp_operation_threshold_alpha_process;
g_object_class_install_property (object_class, PROP_VALUE,
g_param_spec_double ("value",
_("Value"),
_("The alpha value"),
0.0, 1.0, 0.5,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_operation_threshold_alpha_init (GimpOperationThresholdAlpha *self)
{
}
static void
gimp_operation_threshold_alpha_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object);
switch (property_id)
{
case PROP_VALUE:
g_value_set_double (value, self->value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_operation_threshold_alpha_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (object);
switch (property_id)
{
case PROP_VALUE:
self->value = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_operation_threshold_alpha_prepare (GeglOperation *operation)
{
const Babl *space = gegl_operation_get_source_space (operation, "input");
gegl_operation_set_format (operation, "input", babl_format_with_space ("RGBA float", space));
gegl_operation_set_format (operation, "output", babl_format_with_space ("RGBA float", space));
}
static gboolean
gimp_operation_threshold_alpha_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationThresholdAlpha *self = GIMP_OPERATION_THRESHOLD_ALPHA (operation);
gfloat *src = in_buf;
gfloat *dest = out_buf;
while (samples--)
{
dest[RED] = src[RED];
dest[GREEN] = src[GREEN];
dest[BLUE] = src[BLUE];
if (src[ALPHA] > self->value)
dest[ALPHA] = 1.0;
else
dest[ALPHA] = 0.0;
src += 4;
dest += 4;
}
return TRUE;
}
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