PIKApp/app/operations/pikabrightnesscontrastconfig.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikabrightnesscontrastconfig.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 <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikamath/pikamath.h"
#include "libpikaconfig/pikaconfig.h"
#include "operations-types.h"
#include "pikabrightnesscontrastconfig.h"
#include "pikalevelsconfig.h"
#include "pika-intl.h"
enum
{
PROP_0,
PROP_BRIGHTNESS,
PROP_CONTRAST
};
static void pika_brightness_contrast_config_iface_init (PikaConfigInterface *iface);
static void pika_brightness_contrast_config_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_brightness_contrast_config_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static gboolean pika_brightness_contrast_config_equal (PikaConfig *a,
PikaConfig *b);
G_DEFINE_TYPE_WITH_CODE (PikaBrightnessContrastConfig,
pika_brightness_contrast_config,
PIKA_TYPE_OPERATION_SETTINGS,
G_IMPLEMENT_INTERFACE (PIKA_TYPE_CONFIG,
pika_brightness_contrast_config_iface_init))
#define parent_class pika_brightness_contrast_config_parent_class
static void
pika_brightness_contrast_config_class_init (PikaBrightnessContrastConfigClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaViewableClass *viewable_class = PIKA_VIEWABLE_CLASS (klass);
object_class->set_property = pika_brightness_contrast_config_set_property;
object_class->get_property = pika_brightness_contrast_config_get_property;
viewable_class->default_icon_name = "pika-tool-brightness-contrast";
PIKA_CONFIG_PROP_DOUBLE (object_class, PROP_BRIGHTNESS,
"brightness",
_("Brightness"),
_("Brightness"),
-1.0, 1.0, 0.0, 0);
PIKA_CONFIG_PROP_DOUBLE (object_class, PROP_CONTRAST,
"contrast",
_("Contrast"),
_("Contrast"),
-1.0, 1.0, 0.0, 0);
}
static void
pika_brightness_contrast_config_iface_init (PikaConfigInterface *iface)
{
iface->equal = pika_brightness_contrast_config_equal;
}
static void
pika_brightness_contrast_config_init (PikaBrightnessContrastConfig *self)
{
}
static void
pika_brightness_contrast_config_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaBrightnessContrastConfig *self = PIKA_BRIGHTNESS_CONTRAST_CONFIG (object);
switch (property_id)
{
case PROP_BRIGHTNESS:
g_value_set_double (value, self->brightness);
break;
case PROP_CONTRAST:
g_value_set_double (value, self->contrast);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_brightness_contrast_config_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaBrightnessContrastConfig *self = PIKA_BRIGHTNESS_CONTRAST_CONFIG (object);
switch (property_id)
{
case PROP_BRIGHTNESS:
self->brightness = g_value_get_double (value);
break;
case PROP_CONTRAST:
self->contrast = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
pika_brightness_contrast_config_equal (PikaConfig *a,
PikaConfig *b)
{
PikaBrightnessContrastConfig *config_a = PIKA_BRIGHTNESS_CONTRAST_CONFIG (a);
PikaBrightnessContrastConfig *config_b = PIKA_BRIGHTNESS_CONTRAST_CONFIG (b);
if (! pika_operation_settings_config_equal_base (a, b) ||
config_a->brightness != config_b->brightness ||
config_a->contrast != config_b->contrast)
{
return FALSE;
}
return TRUE;
}
/* public functions */
PikaLevelsConfig *
pika_brightness_contrast_config_to_levels_config (PikaBrightnessContrastConfig *config)
{
PikaLevelsConfig *levels;
gdouble brightness;
gdouble slant;
gdouble value;
g_return_val_if_fail (PIKA_IS_BRIGHTNESS_CONTRAST_CONFIG (config), NULL);
levels = g_object_new (PIKA_TYPE_LEVELS_CONFIG, NULL);
pika_operation_settings_config_copy_base (PIKA_CONFIG (config),
PIKA_CONFIG (levels),
0);
brightness = config->brightness / 2.0;
slant = tan ((config->contrast + 1) * G_PI_4);
if (config->brightness >= 0)
{
value = -0.5 * slant + brightness * slant + 0.5;
if (value < 0.0)
{
value = 0.0;
/* this slightly convoluted math follows by inverting the
* calculation of the brightness/contrast LUT in base/lut-funcs.h */
levels->low_input[PIKA_HISTOGRAM_VALUE] =
(- brightness * slant + 0.5 * slant - 0.5) / (slant - brightness * slant);
}
levels->low_output[PIKA_HISTOGRAM_VALUE] = value;
value = 0.5 * slant + 0.5;
if (value > 1.0)
{
value = 1.0;
levels->high_input[PIKA_HISTOGRAM_VALUE] =
(- brightness * slant + 0.5 * slant + 0.5) / (slant - brightness * slant);
}
levels->high_output[PIKA_HISTOGRAM_VALUE] = value;
}
else
{
value = 0.5 - 0.5 * slant;
if (value < 0.0)
{
value = 0.0;
levels->low_input[PIKA_HISTOGRAM_VALUE] =
(0.5 * slant - 0.5) / (slant + brightness * slant);
}
levels->low_output[PIKA_HISTOGRAM_VALUE] = value;
value = slant * brightness + slant * 0.5 + 0.5;
if (value > 1.0)
{
value = 1.0;
levels->high_input[PIKA_HISTOGRAM_VALUE] =
(0.5 * slant + 0.5) / (slant + brightness * slant);
}
levels->high_output[PIKA_HISTOGRAM_VALUE] = value;
}
return levels;
}