mirror of https://github.com/GNOME/gimp.git
993 lines
31 KiB
C
993 lines
31 KiB
C
/* GIMP - The GNU Image Manipulation Program
|
||
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
|
||
*
|
||
* gimplevelsconfig.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 <errno.h>
|
||
|
||
#include <cairo.h>
|
||
#include <gegl.h>
|
||
#include <gdk-pixbuf/gdk-pixbuf.h>
|
||
|
||
#include "libgimpbase/gimpbase.h"
|
||
#include "libgimpcolor/gimpcolor.h"
|
||
#include "libgimpmath/gimpmath.h"
|
||
#include "libgimpconfig/gimpconfig.h"
|
||
|
||
#include "operations-types.h"
|
||
|
||
#include "core/gimp-utils.h"
|
||
#include "core/gimpcurve.h"
|
||
#include "core/gimphistogram.h"
|
||
|
||
#include "gimpcurvesconfig.h"
|
||
#include "gimplevelsconfig.h"
|
||
#include "gimpoperationlevels.h"
|
||
|
||
#include "gimp-intl.h"
|
||
|
||
|
||
enum
|
||
{
|
||
PROP_0,
|
||
PROP_TRC,
|
||
PROP_LINEAR,
|
||
PROP_CHANNEL,
|
||
PROP_LOW_INPUT,
|
||
PROP_HIGH_INPUT,
|
||
PROP_CLAMP_INPUT,
|
||
PROP_GAMMA,
|
||
PROP_LOW_OUTPUT,
|
||
PROP_HIGH_OUTPUT,
|
||
PROP_CLAMP_OUTPUT
|
||
};
|
||
|
||
|
||
static void gimp_levels_config_iface_init (GimpConfigInterface *iface);
|
||
|
||
static void gimp_levels_config_get_property (GObject *object,
|
||
guint property_id,
|
||
GValue *value,
|
||
GParamSpec *pspec);
|
||
static void gimp_levels_config_set_property (GObject *object,
|
||
guint property_id,
|
||
const GValue *value,
|
||
GParamSpec *pspec);
|
||
|
||
static gboolean gimp_levels_config_serialize (GimpConfig *config,
|
||
GimpConfigWriter *writer,
|
||
gpointer data);
|
||
static gboolean gimp_levels_config_deserialize (GimpConfig *config,
|
||
GScanner *scanner,
|
||
gint nest_level,
|
||
gpointer data);
|
||
static gboolean gimp_levels_config_equal (GimpConfig *a,
|
||
GimpConfig *b);
|
||
static void gimp_levels_config_reset (GimpConfig *config);
|
||
static gboolean gimp_levels_config_copy (GimpConfig *src,
|
||
GimpConfig *dest,
|
||
GParamFlags flags);
|
||
|
||
|
||
G_DEFINE_TYPE_WITH_CODE (GimpLevelsConfig, gimp_levels_config,
|
||
GIMP_TYPE_OPERATION_SETTINGS,
|
||
G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
|
||
gimp_levels_config_iface_init))
|
||
|
||
#define parent_class gimp_levels_config_parent_class
|
||
|
||
|
||
static void
|
||
gimp_levels_config_class_init (GimpLevelsConfigClass *klass)
|
||
{
|
||
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
||
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
|
||
|
||
object_class->set_property = gimp_levels_config_set_property;
|
||
object_class->get_property = gimp_levels_config_get_property;
|
||
|
||
viewable_class->default_icon_name = "gimp-tool-levels";
|
||
|
||
GIMP_CONFIG_PROP_ENUM (object_class, PROP_TRC,
|
||
"trc",
|
||
_("Linear/Perceptual"),
|
||
_("Work on linear or perceptual RGB"),
|
||
GIMP_TYPE_TRC_TYPE,
|
||
GIMP_TRC_NON_LINEAR, 0);
|
||
|
||
/* compat */
|
||
GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_LINEAR,
|
||
"linear",
|
||
_("Linear"),
|
||
_("Work on linear RGB"),
|
||
FALSE, 0);
|
||
|
||
GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
|
||
"channel",
|
||
_("Channel"),
|
||
_("The affected channel"),
|
||
GIMP_TYPE_HISTOGRAM_CHANNEL,
|
||
GIMP_HISTOGRAM_VALUE, 0);
|
||
|
||
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW_INPUT,
|
||
"low-input",
|
||
_("Low Input"),
|
||
_("Low Input"),
|
||
0.0, 1.0, 0.0, 0);
|
||
|
||
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH_INPUT,
|
||
"high-input",
|
||
_("High Input"),
|
||
_("High Input"),
|
||
0.0, 1.0, 1.0, 0);
|
||
|
||
GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_CLAMP_INPUT,
|
||
"clamp-input",
|
||
_("Clamp Input"),
|
||
_("Clamp input values before applying output mapping."),
|
||
FALSE, 0);
|
||
|
||
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_GAMMA,
|
||
"gamma",
|
||
_("Gamma"),
|
||
_("Gamma"),
|
||
0.1, 10.0, 1.0, 0);
|
||
|
||
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_LOW_OUTPUT,
|
||
"low-output",
|
||
_("Low Output"),
|
||
_("Low Output"),
|
||
0.0, 1.0, 0.0, 0);
|
||
|
||
GIMP_CONFIG_PROP_DOUBLE (object_class, PROP_HIGH_OUTPUT,
|
||
"high-output",
|
||
_("High Output"),
|
||
_("High Output"),
|
||
0.0, 1.0, 1.0, 0);
|
||
|
||
GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_CLAMP_OUTPUT,
|
||
"clamp-output",
|
||
_("Clamp Output"),
|
||
_("Clamp final output values."),
|
||
FALSE, 0);
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_iface_init (GimpConfigInterface *iface)
|
||
{
|
||
iface->serialize = gimp_levels_config_serialize;
|
||
iface->deserialize = gimp_levels_config_deserialize;
|
||
iface->equal = gimp_levels_config_equal;
|
||
iface->reset = gimp_levels_config_reset;
|
||
iface->copy = gimp_levels_config_copy;
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_init (GimpLevelsConfig *self)
|
||
{
|
||
gimp_config_reset (GIMP_CONFIG (self));
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_get_property (GObject *object,
|
||
guint property_id,
|
||
GValue *value,
|
||
GParamSpec *pspec)
|
||
{
|
||
GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
|
||
|
||
switch (property_id)
|
||
{
|
||
case PROP_TRC:
|
||
g_value_set_enum (value, self->trc);
|
||
break;
|
||
|
||
case PROP_LINEAR:
|
||
g_value_set_boolean (value, self->trc == GIMP_TRC_LINEAR ? TRUE : FALSE);
|
||
break;
|
||
|
||
case PROP_CHANNEL:
|
||
g_value_set_enum (value, self->channel);
|
||
break;
|
||
|
||
case PROP_LOW_INPUT:
|
||
g_value_set_double (value, self->low_input[self->channel]);
|
||
break;
|
||
|
||
case PROP_HIGH_INPUT:
|
||
g_value_set_double (value, self->high_input[self->channel]);
|
||
break;
|
||
|
||
case PROP_CLAMP_INPUT:
|
||
g_value_set_boolean (value, self->clamp_input);
|
||
break;
|
||
|
||
case PROP_GAMMA:
|
||
g_value_set_double (value, self->gamma[self->channel]);
|
||
break;
|
||
|
||
case PROP_LOW_OUTPUT:
|
||
g_value_set_double (value, self->low_output[self->channel]);
|
||
break;
|
||
|
||
case PROP_HIGH_OUTPUT:
|
||
g_value_set_double (value, self->high_output[self->channel]);
|
||
break;
|
||
|
||
case PROP_CLAMP_OUTPUT:
|
||
g_value_set_boolean (value, self->clamp_output);
|
||
break;
|
||
|
||
default:
|
||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
|
||
break;
|
||
}
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_set_property (GObject *object,
|
||
guint property_id,
|
||
const GValue *value,
|
||
GParamSpec *pspec)
|
||
{
|
||
GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
|
||
|
||
switch (property_id)
|
||
{
|
||
case PROP_TRC:
|
||
self->trc = g_value_get_enum (value);
|
||
break;
|
||
|
||
case PROP_LINEAR:
|
||
self->trc = g_value_get_boolean (value) ?
|
||
GIMP_TRC_LINEAR : GIMP_TRC_NON_LINEAR;
|
||
g_object_notify (object, "trc");
|
||
break;
|
||
|
||
case PROP_CHANNEL:
|
||
self->channel = g_value_get_enum (value);
|
||
g_object_notify (object, "low-input");
|
||
g_object_notify (object, "high-input");
|
||
g_object_notify (object, "gamma");
|
||
g_object_notify (object, "low-output");
|
||
g_object_notify (object, "high-output");
|
||
break;
|
||
|
||
case PROP_LOW_INPUT:
|
||
self->low_input[self->channel] = g_value_get_double (value);
|
||
break;
|
||
|
||
case PROP_HIGH_INPUT:
|
||
self->high_input[self->channel] = g_value_get_double (value);
|
||
break;
|
||
|
||
case PROP_CLAMP_INPUT:
|
||
self->clamp_input = g_value_get_boolean (value);
|
||
break;
|
||
|
||
case PROP_GAMMA:
|
||
self->gamma[self->channel] = g_value_get_double (value);
|
||
break;
|
||
|
||
case PROP_LOW_OUTPUT:
|
||
self->low_output[self->channel] = g_value_get_double (value);
|
||
break;
|
||
|
||
case PROP_HIGH_OUTPUT:
|
||
self->high_output[self->channel] = g_value_get_double (value);
|
||
break;
|
||
|
||
case PROP_CLAMP_OUTPUT:
|
||
self->clamp_output = g_value_get_boolean (value);
|
||
break;
|
||
|
||
default:
|
||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
|
||
break;
|
||
}
|
||
}
|
||
|
||
static gboolean
|
||
gimp_levels_config_serialize (GimpConfig *config,
|
||
GimpConfigWriter *writer,
|
||
gpointer data)
|
||
{
|
||
GimpLevelsConfig *l_config = GIMP_LEVELS_CONFIG (config);
|
||
GimpHistogramChannel channel;
|
||
GimpHistogramChannel old_channel;
|
||
gboolean success = TRUE;
|
||
|
||
if (! gimp_operation_settings_config_serialize_base (config, writer, data) ||
|
||
! gimp_config_serialize_property_by_name (config, "trc", writer) ||
|
||
! gimp_config_serialize_property_by_name (config, "clamp-input", writer) ||
|
||
! gimp_config_serialize_property_by_name (config, "clamp-output", writer))
|
||
return FALSE;
|
||
|
||
old_channel = l_config->channel;
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
l_config->channel = channel;
|
||
|
||
/* serialize the channel properties manually (not using
|
||
* gimp_config_serialize_properties()), so the parent class'
|
||
* properties don't end up in the config file one per channel.
|
||
* See bug #700653.
|
||
*/
|
||
success =
|
||
(gimp_config_serialize_property_by_name (config, "channel", writer) &&
|
||
gimp_config_serialize_property_by_name (config, "low-input", writer) &&
|
||
gimp_config_serialize_property_by_name (config, "high-input", writer) &&
|
||
gimp_config_serialize_property_by_name (config, "gamma", writer) &&
|
||
gimp_config_serialize_property_by_name (config, "low-output", writer) &&
|
||
gimp_config_serialize_property_by_name (config, "high-output", writer));
|
||
|
||
if (! success)
|
||
break;
|
||
}
|
||
|
||
l_config->channel = old_channel;
|
||
|
||
return success;
|
||
}
|
||
|
||
static gboolean
|
||
gimp_levels_config_deserialize (GimpConfig *config,
|
||
GScanner *scanner,
|
||
gint nest_level,
|
||
gpointer data)
|
||
{
|
||
GimpLevelsConfig *l_config = GIMP_LEVELS_CONFIG (config);
|
||
GimpHistogramChannel old_channel;
|
||
gboolean success = TRUE;
|
||
|
||
old_channel = l_config->channel;
|
||
|
||
success = gimp_config_deserialize_properties (config, scanner, nest_level);
|
||
|
||
g_object_set (config, "channel", old_channel, NULL);
|
||
|
||
return success;
|
||
}
|
||
|
||
static gboolean
|
||
gimp_levels_config_equal (GimpConfig *a,
|
||
GimpConfig *b)
|
||
{
|
||
GimpLevelsConfig *config_a = GIMP_LEVELS_CONFIG (a);
|
||
GimpLevelsConfig *config_b = GIMP_LEVELS_CONFIG (b);
|
||
GimpHistogramChannel channel;
|
||
|
||
if (! gimp_operation_settings_config_equal_base (a, b) ||
|
||
config_a->trc != config_b->trc ||
|
||
config_a->clamp_input != config_b->clamp_input ||
|
||
config_a->clamp_output != config_b->clamp_output)
|
||
return FALSE;
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
if (config_a->gamma[channel] != config_b->gamma[channel] ||
|
||
config_a->low_input[channel] != config_b->low_input[channel] ||
|
||
config_a->high_input[channel] != config_b->high_input[channel] ||
|
||
config_a->low_output[channel] != config_b->low_output[channel] ||
|
||
config_a->high_output[channel] != config_b->high_output[channel])
|
||
return FALSE;
|
||
}
|
||
|
||
/* don't compare "channel" */
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_reset (GimpConfig *config)
|
||
{
|
||
GimpLevelsConfig *l_config = GIMP_LEVELS_CONFIG (config);
|
||
GimpHistogramChannel channel;
|
||
|
||
gimp_operation_settings_config_reset_base (config);
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
l_config->channel = channel;
|
||
gimp_levels_config_reset_channel (l_config);
|
||
}
|
||
|
||
gimp_config_reset_property (G_OBJECT (config), "trc");
|
||
gimp_config_reset_property (G_OBJECT (config), "channel");
|
||
gimp_config_reset_property (G_OBJECT (config), "clamp-input");
|
||
gimp_config_reset_property (G_OBJECT (config), "clamp_output");
|
||
}
|
||
|
||
static gboolean
|
||
gimp_levels_config_copy (GimpConfig *src,
|
||
GimpConfig *dest,
|
||
GParamFlags flags)
|
||
{
|
||
GimpLevelsConfig *src_config = GIMP_LEVELS_CONFIG (src);
|
||
GimpLevelsConfig *dest_config = GIMP_LEVELS_CONFIG (dest);
|
||
GimpHistogramChannel channel;
|
||
|
||
if (! gimp_operation_settings_config_copy_base (src, dest, flags))
|
||
return FALSE;
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
dest_config->gamma[channel] = src_config->gamma[channel];
|
||
dest_config->low_input[channel] = src_config->low_input[channel];
|
||
dest_config->high_input[channel] = src_config->high_input[channel];
|
||
dest_config->low_output[channel] = src_config->low_output[channel];
|
||
dest_config->high_output[channel] = src_config->high_output[channel];
|
||
}
|
||
|
||
g_object_notify (G_OBJECT (dest), "gamma");
|
||
g_object_notify (G_OBJECT (dest), "low-input");
|
||
g_object_notify (G_OBJECT (dest), "high-input");
|
||
g_object_notify (G_OBJECT (dest), "low-output");
|
||
g_object_notify (G_OBJECT (dest), "high-output");
|
||
|
||
dest_config->trc = src_config->trc;
|
||
dest_config->channel = src_config->channel;
|
||
dest_config->clamp_input = src_config->clamp_input;
|
||
dest_config->clamp_output = src_config->clamp_output;
|
||
|
||
g_object_notify (G_OBJECT (dest), "trc");
|
||
g_object_notify (G_OBJECT (dest), "channel");
|
||
g_object_notify (G_OBJECT (dest), "clamp-input");
|
||
g_object_notify (G_OBJECT (dest), "clamp-output");
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
/* public functions */
|
||
|
||
void
|
||
gimp_levels_config_reset_channel (GimpLevelsConfig *config)
|
||
{
|
||
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
|
||
|
||
g_object_freeze_notify (G_OBJECT (config));
|
||
|
||
gimp_config_reset_property (G_OBJECT (config), "gamma");
|
||
gimp_config_reset_property (G_OBJECT (config), "low-input");
|
||
gimp_config_reset_property (G_OBJECT (config), "high-input");
|
||
gimp_config_reset_property (G_OBJECT (config), "low-output");
|
||
gimp_config_reset_property (G_OBJECT (config), "high-output");
|
||
|
||
g_object_thaw_notify (G_OBJECT (config));
|
||
}
|
||
|
||
void
|
||
gimp_levels_config_stretch (GimpLevelsConfig *config,
|
||
GimpHistogram *histogram,
|
||
gboolean is_color)
|
||
{
|
||
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
|
||
g_return_if_fail (histogram != NULL);
|
||
|
||
g_object_freeze_notify (G_OBJECT (config));
|
||
|
||
if (is_color)
|
||
{
|
||
GimpHistogramChannel channel;
|
||
|
||
/* Set the overall value to defaults */
|
||
channel = config->channel;
|
||
config->channel = GIMP_HISTOGRAM_VALUE;
|
||
gimp_levels_config_reset_channel (config);
|
||
config->channel = channel;
|
||
|
||
for (channel = GIMP_HISTOGRAM_RED;
|
||
channel <= GIMP_HISTOGRAM_BLUE;
|
||
channel++)
|
||
{
|
||
gimp_levels_config_stretch_channel (config, histogram, channel);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
gimp_levels_config_stretch_channel (config, histogram,
|
||
GIMP_HISTOGRAM_VALUE);
|
||
}
|
||
|
||
g_object_thaw_notify (G_OBJECT (config));
|
||
}
|
||
|
||
void
|
||
gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
|
||
GimpHistogram *histogram,
|
||
GimpHistogramChannel channel)
|
||
{
|
||
gdouble count;
|
||
gdouble bias = 0.006;
|
||
gint n_bins;
|
||
gint i;
|
||
|
||
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
|
||
g_return_if_fail (histogram != NULL);
|
||
|
||
g_object_freeze_notify (G_OBJECT (config));
|
||
|
||
config->gamma[channel] = 1.0;
|
||
config->low_output[channel] = 0.0;
|
||
config->high_output[channel] = 1.0;
|
||
|
||
n_bins = gimp_histogram_n_bins (histogram);
|
||
count = gimp_histogram_get_count (histogram, channel, 0, n_bins - 1);
|
||
|
||
if (count == 0.0)
|
||
{
|
||
config->low_input[channel] = 0.0;
|
||
config->high_input[channel] = 0.0;
|
||
}
|
||
else
|
||
{
|
||
gdouble new_count;
|
||
gdouble percentage;
|
||
gdouble next_percentage;
|
||
|
||
/* Set the low input */
|
||
new_count = 0.0;
|
||
|
||
for (i = 0; i < (n_bins - 1); i++)
|
||
{
|
||
new_count += gimp_histogram_get_value (histogram, channel, i);
|
||
percentage = new_count / count;
|
||
next_percentage = (new_count +
|
||
gimp_histogram_get_value (histogram,
|
||
channel,
|
||
i + 1)) / count;
|
||
|
||
if (fabs (percentage - bias) < fabs (next_percentage - bias))
|
||
{
|
||
config->low_input[channel] = (gdouble) (i + 1) / (n_bins - 1);
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Set the high input */
|
||
new_count = 0.0;
|
||
|
||
for (i = (n_bins - 1); i > 0; i--)
|
||
{
|
||
new_count += gimp_histogram_get_value (histogram, channel, i);
|
||
percentage = new_count / count;
|
||
next_percentage = (new_count +
|
||
gimp_histogram_get_value (histogram,
|
||
channel,
|
||
i - 1)) / count;
|
||
|
||
if (fabs (percentage - bias) < fabs (next_percentage - bias))
|
||
{
|
||
config->high_input[channel] = (gdouble) (i - 1) / (n_bins - 1);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
g_object_notify (G_OBJECT (config), "gamma");
|
||
g_object_notify (G_OBJECT (config), "low-input");
|
||
g_object_notify (G_OBJECT (config), "high-input");
|
||
g_object_notify (G_OBJECT (config), "low-output");
|
||
g_object_notify (G_OBJECT (config), "high-output");
|
||
|
||
g_object_thaw_notify (G_OBJECT (config));
|
||
}
|
||
|
||
static gdouble
|
||
gimp_levels_config_input_from_color (GimpLevelsConfig *config,
|
||
GimpHistogramChannel channel,
|
||
GeglColor *color)
|
||
{
|
||
gdouble rgba[4];
|
||
|
||
/* TODO: should I get colors within a specific space? */
|
||
if (config->trc == GIMP_TRC_LINEAR)
|
||
gegl_color_get_pixel (color, babl_format ("RGBA double"), rgba);
|
||
else
|
||
gegl_color_get_pixel (color, babl_format ("R'G'B'A double"), rgba);
|
||
|
||
switch (channel)
|
||
{
|
||
case GIMP_HISTOGRAM_VALUE:
|
||
return MAX (MAX (rgba[0], rgba[1]), rgba[2]);
|
||
|
||
case GIMP_HISTOGRAM_RED:
|
||
return rgba[0];
|
||
|
||
case GIMP_HISTOGRAM_GREEN:
|
||
return rgba[1];
|
||
|
||
case GIMP_HISTOGRAM_BLUE:
|
||
return rgba[2];
|
||
|
||
case GIMP_HISTOGRAM_ALPHA:
|
||
return rgba[3];
|
||
|
||
case GIMP_HISTOGRAM_RGB:
|
||
return MIN (MIN (rgba[0], rgba[1]), rgba[2]);
|
||
|
||
case GIMP_HISTOGRAM_LUMINANCE:
|
||
return GIMP_RGB_LUMINANCE (rgba[0], rgba[1], rgba[2]);
|
||
}
|
||
|
||
return 0.0;
|
||
}
|
||
|
||
void
|
||
gimp_levels_config_adjust_by_colors (GimpLevelsConfig *config,
|
||
GimpHistogramChannel channel,
|
||
GeglColor *black,
|
||
GeglColor *gray,
|
||
GeglColor *white)
|
||
{
|
||
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
|
||
|
||
g_object_freeze_notify (G_OBJECT (config));
|
||
|
||
if (black)
|
||
{
|
||
config->low_input[channel] = gimp_levels_config_input_from_color (config, channel, black);
|
||
g_object_notify (G_OBJECT (config), "low-input");
|
||
}
|
||
|
||
|
||
if (white)
|
||
{
|
||
config->high_input[channel] = gimp_levels_config_input_from_color (config, channel, white);
|
||
g_object_notify (G_OBJECT (config), "high-input");
|
||
}
|
||
|
||
if (gray)
|
||
{
|
||
gdouble input;
|
||
gdouble range;
|
||
gdouble inten;
|
||
gdouble out_light;
|
||
gdouble lightness;
|
||
gdouble rgba[4];
|
||
|
||
/* Calculate lightness value */
|
||
gegl_color_get_pixel (gray, babl_format ("RGBA double"), rgba);
|
||
lightness = GIMP_RGB_LUMINANCE (rgba[0], rgba[1], rgba[2]);
|
||
|
||
input = gimp_levels_config_input_from_color (config, channel, gray);
|
||
|
||
range = config->high_input[channel] - config->low_input[channel];
|
||
if (range <= 0)
|
||
goto out;
|
||
|
||
input -= config->low_input[channel];
|
||
if (input < 0)
|
||
goto out;
|
||
|
||
/* Normalize input and lightness */
|
||
inten = input / range;
|
||
out_light = lightness / range;
|
||
|
||
/* See bug 622054: picking pure black or white as gamma doesn't
|
||
* work. But we cannot compare to 0.0 or 1.0 because cpus and
|
||
* compilers are shit. If you try to check out_light using
|
||
* printf() it will give exact 0.0 or 1.0 anyway, probably
|
||
* because the generated code is different and out_light doesn't
|
||
* live in a register. That must be why the cpu/compiler mafia
|
||
* invented epsilon and defined this shit to be the programmer's
|
||
* responsibility.
|
||
*/
|
||
if (out_light <= 0.0001 || out_light >= 0.9999)
|
||
goto out;
|
||
|
||
/* Map selected color to corresponding lightness */
|
||
config->gamma[channel] = log (inten) / log (out_light);
|
||
config->gamma[channel] = CLAMP (config->gamma[channel], 0.1, 10.0);
|
||
g_object_notify (G_OBJECT (config), "gamma");
|
||
}
|
||
|
||
out:
|
||
g_object_thaw_notify (G_OBJECT (config));
|
||
}
|
||
|
||
GimpCurvesConfig *
|
||
gimp_levels_config_to_curves_config (GimpLevelsConfig *config)
|
||
{
|
||
GimpCurvesConfig *curves;
|
||
GimpHistogramChannel channel;
|
||
|
||
g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), NULL);
|
||
|
||
curves = g_object_new (GIMP_TYPE_CURVES_CONFIG, NULL);
|
||
|
||
gimp_operation_settings_config_copy_base (GIMP_CONFIG (config),
|
||
GIMP_CONFIG (curves),
|
||
0);
|
||
|
||
curves->trc = config->trc;
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
GimpCurve *curve = curves->curve[channel];
|
||
static const gint n = 8;
|
||
gdouble gamma = config->gamma[channel];
|
||
gdouble delta_in;
|
||
gdouble delta_out;
|
||
gdouble x, y;
|
||
|
||
/* clear the points set by default */
|
||
gimp_curve_clear_points (curve);
|
||
|
||
delta_in = config->high_input[channel] - config->low_input[channel];
|
||
delta_out = config->high_output[channel] - config->low_output[channel];
|
||
|
||
x = config->low_input[channel];
|
||
y = config->low_output[channel];
|
||
|
||
gimp_curve_add_point (curve, x, y);
|
||
|
||
if (delta_out != 0 && gamma != 1.0)
|
||
{
|
||
/* The Levels tool performs gamma adjustment, which is a
|
||
* power law, while the Curves tool uses cubic Bézier
|
||
* curves. Here we try to approximate this gamma adjustment
|
||
* with a Bézier curve with 5 control points. Two of them
|
||
* must be (low_input, low_output) and (high_input,
|
||
* high_output), so we need to add 3 more control points in
|
||
* the middle.
|
||
*/
|
||
gint i;
|
||
|
||
if (gamma > 1)
|
||
{
|
||
/* Case no. 1: γ > 1
|
||
*
|
||
* The curve should look like a horizontal
|
||
* parabola. Since its curvature is greatest when x is
|
||
* small, we add more control points there, so the
|
||
* approximation is more accurate. I decided to set the
|
||
* length of the consecutive segments to x₀, γ⋅x₀, γ²⋅x₀
|
||
* and γ³⋅x₀ and I saw that the curves looked
|
||
* good. Still, this is completely arbitrary.
|
||
*/
|
||
gdouble dx = 0;
|
||
gdouble x0;
|
||
|
||
for (i = 0; i < n; ++i)
|
||
dx = dx * gamma + 1;
|
||
x0 = delta_in / dx;
|
||
|
||
dx = 0;
|
||
for (i = 1; i < n; ++i)
|
||
{
|
||
dx = dx * gamma + x0;
|
||
x = config->low_input[channel] + dx;
|
||
y = config->low_output[channel] + delta_out *
|
||
gimp_operation_levels_map_input (config, channel, x);
|
||
gimp_curve_add_point (curve, x, y);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Case no. 2: γ < 1
|
||
*
|
||
* The curve is the same as the one in case no. 1,
|
||
* observed through a reflexion along the y = x axis. So
|
||
* if we invert γ and swap the x and y axes we can use
|
||
* the same method as in case no. 1.
|
||
*/
|
||
GimpLevelsConfig *config_inv;
|
||
gdouble dy = 0;
|
||
gdouble y0;
|
||
const gdouble gamma_inv = 1 / gamma;
|
||
|
||
config_inv = gimp_config_duplicate (GIMP_CONFIG (config));
|
||
|
||
config_inv->gamma[channel] = gamma_inv;
|
||
config_inv->low_input[channel] = config->low_output[channel];
|
||
config_inv->low_output[channel] = config->low_input[channel];
|
||
config_inv->high_input[channel] = config->high_output[channel];
|
||
config_inv->high_output[channel] = config->high_input[channel];
|
||
|
||
for (i = 0; i < n; ++i)
|
||
dy = dy * gamma_inv + 1;
|
||
y0 = delta_out / dy;
|
||
|
||
dy = 0;
|
||
for (i = 1; i < n; ++i)
|
||
{
|
||
dy = dy * gamma_inv + y0;
|
||
y = config->low_output[channel] + dy;
|
||
x = config->low_input[channel] + delta_in *
|
||
gimp_operation_levels_map_input (config_inv, channel, y);
|
||
gimp_curve_add_point (curve, x, y);
|
||
}
|
||
|
||
g_object_unref (config_inv);
|
||
}
|
||
}
|
||
|
||
x = config->high_input[channel];
|
||
y = config->high_output[channel];
|
||
|
||
gimp_curve_add_point (curve, x, y);
|
||
}
|
||
|
||
return curves;
|
||
}
|
||
|
||
gboolean
|
||
gimp_levels_config_load_cruft (GimpLevelsConfig *config,
|
||
GInputStream *input,
|
||
GError **error)
|
||
{
|
||
GDataInputStream *data_input;
|
||
gint low_input[5];
|
||
gint high_input[5];
|
||
gint low_output[5];
|
||
gint high_output[5];
|
||
gdouble gamma[5];
|
||
gchar *line;
|
||
gsize line_len;
|
||
gint i;
|
||
|
||
g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), FALSE);
|
||
g_return_val_if_fail (G_IS_INPUT_STREAM (input), FALSE);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
||
|
||
data_input = g_data_input_stream_new (input);
|
||
|
||
line_len = 64;
|
||
line = gimp_data_input_stream_read_line_always (data_input, &line_len,
|
||
NULL, error);
|
||
if (! line)
|
||
return FALSE;
|
||
|
||
if (strcmp (line, "# GIMP Levels File") != 0)
|
||
{
|
||
g_set_error_literal (error, GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
|
||
_("not a GIMP Levels file"));
|
||
g_object_unref (data_input);
|
||
g_free (line);
|
||
return FALSE;
|
||
}
|
||
|
||
g_free (line);
|
||
|
||
for (i = 0; i < 5; i++)
|
||
{
|
||
gchar float_buf[32];
|
||
gchar *endp;
|
||
gint fields;
|
||
|
||
line_len = 64;
|
||
line = gimp_data_input_stream_read_line_always (data_input, &line_len,
|
||
NULL, error);
|
||
if (! line)
|
||
{
|
||
g_object_unref (data_input);
|
||
return FALSE;
|
||
}
|
||
|
||
fields = sscanf (line, "%d %d %d %d %31s",
|
||
&low_input[i],
|
||
&high_input[i],
|
||
&low_output[i],
|
||
&high_output[i],
|
||
float_buf);
|
||
|
||
g_free (line);
|
||
|
||
if (fields != 5)
|
||
goto error;
|
||
|
||
gamma[i] = g_ascii_strtod (float_buf, &endp);
|
||
|
||
if (endp == float_buf || errno == ERANGE)
|
||
goto error;
|
||
}
|
||
|
||
g_object_unref (data_input);
|
||
|
||
g_object_freeze_notify (G_OBJECT (config));
|
||
|
||
for (i = 0; i < 5; i++)
|
||
{
|
||
config->low_input[i] = low_input[i] / 255.0;
|
||
config->high_input[i] = high_input[i] / 255.0;
|
||
config->gamma[i] = gamma[i];
|
||
config->low_output[i] = low_output[i] / 255.0;
|
||
config->high_output[i] = high_output[i] / 255.0;
|
||
}
|
||
|
||
config->trc = GIMP_TRC_NON_LINEAR;
|
||
config->clamp_input = TRUE;
|
||
config->clamp_output = TRUE;
|
||
|
||
g_object_notify (G_OBJECT (config), "trc");
|
||
g_object_notify (G_OBJECT (config), "low-input");
|
||
g_object_notify (G_OBJECT (config), "high-input");
|
||
g_object_notify (G_OBJECT (config), "clamp-input");
|
||
g_object_notify (G_OBJECT (config), "gamma");
|
||
g_object_notify (G_OBJECT (config), "low-output");
|
||
g_object_notify (G_OBJECT (config), "high-output");
|
||
g_object_notify (G_OBJECT (config), "clamp-output");
|
||
|
||
g_object_thaw_notify (G_OBJECT (config));
|
||
|
||
return TRUE;
|
||
|
||
error:
|
||
g_object_unref (data_input);
|
||
|
||
g_set_error_literal (error, GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
|
||
_("parse error"));
|
||
return FALSE;
|
||
}
|
||
|
||
gboolean
|
||
gimp_levels_config_save_cruft (GimpLevelsConfig *config,
|
||
GOutputStream *output,
|
||
GError **error)
|
||
{
|
||
GString *string;
|
||
gint i;
|
||
|
||
g_return_val_if_fail (GIMP_IS_LEVELS_CONFIG (config), FALSE);
|
||
g_return_val_if_fail (G_IS_OUTPUT_STREAM (output), FALSE);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
||
|
||
string = g_string_new ("# GIMP Levels File\n");
|
||
|
||
for (i = 0; i < 5; i++)
|
||
{
|
||
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
|
||
|
||
g_string_append_printf (string,
|
||
"%d %d %d %d %s\n",
|
||
(gint) (config->low_input[i] * 255.999),
|
||
(gint) (config->high_input[i] * 255.999),
|
||
(gint) (config->low_output[i] * 255.999),
|
||
(gint) (config->high_output[i] * 255.999),
|
||
g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE,
|
||
config->gamma[i]));
|
||
}
|
||
|
||
if (! g_output_stream_write_all (output, string->str, string->len,
|
||
NULL, NULL, error))
|
||
{
|
||
g_prefix_error (error, _("Writing levels file failed: "));
|
||
g_string_free (string, TRUE);
|
||
return FALSE;
|
||
}
|
||
|
||
g_string_free (string, TRUE);
|
||
|
||
return TRUE;
|
||
}
|