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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationdesaturate.c
* Copyright (C) 2007 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/>.
*/
#include "config.h"
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpconfig/gimpconfig.h"
#include "operations-types.h"
#include "gimpoperationdesaturate.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_MODE
};
static void gimp_operation_desaturate_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_operation_desaturate_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_operation_desaturate_prepare (GeglOperation *operation);
static gboolean gimp_operation_desaturate_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (GimpOperationDesaturate, gimp_operation_desaturate,
GIMP_TYPE_OPERATION_POINT_FILTER)
#define parent_class gimp_operation_desaturate_parent_class
static void
gimp_operation_desaturate_class_init (GimpOperationDesaturateClass *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_desaturate_set_property;
object_class->get_property = gimp_operation_desaturate_get_property;
operation_class->prepare = gimp_operation_desaturate_prepare;
point_class->process = gimp_operation_desaturate_process;
gegl_operation_class_set_keys (operation_class,
"name", "gimp:desaturate",
"categories", "color",
"description", _("Turn colors into shades of gray"),
NULL);
GIMP_CONFIG_PROP_ENUM (object_class, PROP_MODE,
"mode",
_("Mode"),
_("Choose shade of gray based on"),
GIMP_TYPE_DESATURATE_MODE,
GIMP_DESATURATE_LUMINANCE,
GIMP_PARAM_STATIC_STRINGS);
}
static void
gimp_operation_desaturate_init (GimpOperationDesaturate *self)
{
}
static void
gimp_operation_desaturate_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (object);
switch (property_id)
{
case PROP_MODE:
g_value_set_enum (value, desaturate->mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_operation_desaturate_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (object);
switch (property_id)
{
case PROP_MODE:
desaturate->mode = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_operation_desaturate_prepare (GeglOperation *operation)
{
GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (operation);
const Babl *format = gegl_operation_get_source_format (operation, "input");
if (desaturate->mode == GIMP_DESATURATE_LUMINANCE)
{
format = babl_format_with_space ("RGBA float", format);
}
else
{
format = babl_format_with_space ("R'G'B'A float", format);
}
gegl_operation_set_format (operation, "input", format);
gegl_operation_set_format (operation, "output", format);
}
static gboolean
gimp_operation_desaturate_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
GimpOperationDesaturate *desaturate = GIMP_OPERATION_DESATURATE (operation);
gfloat *src = in_buf;
gfloat *dest = out_buf;
switch (desaturate->mode)
{
case GIMP_DESATURATE_LIGHTNESS:
/* This is the formula for Lightness in the HSL "bi-hexcone"
* model: https://en.wikipedia.org/wiki/HSL_and_HSV
*/
while (samples--)
{
gfloat min, max, value;
max = MAX (src[0], src[1]);
max = MAX (max, src[2]);
min = MIN (src[0], src[1]);
min = MIN (min, src[2]);
value = (max + min) / 2;
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
case GIMP_DESATURATE_LUMA:
case GIMP_DESATURATE_LUMINANCE:
while (samples--)
{
gfloat value = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]);
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
case GIMP_DESATURATE_AVERAGE:
/* This is the formula for Intensity in the HSI model:
* https://en.wikipedia.org/wiki/HSL_and_HSV
*/
while (samples--)
{
gfloat value = (src[0] + src[1] + src[2]) / 3;
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
case GIMP_DESATURATE_VALUE:
/* This is the formula for Value in the HSV model:
* https://en.wikipedia.org/wiki/HSL_and_HSV
*/
while (samples--)
{
gfloat value;
value = MAX (src[0], src[1]);
value = MAX (value, src[2]);
dest[0] = value;
dest[1] = value;
dest[2] = value;
dest[3] = src[3];
src += 4;
dest += 4;
}
break;
}
return TRUE;
}
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