54d3beab9c
...and present linear RGB Histograms This is step one: implement the feature at all (without new defaults or proper GUI, cough). Add boolean "linear" properties to GimpOperationPointFilter, GimpCurvesConfig and GimpLevelsConfig. In the filter, simply set the input/output formats to linear in prepare(). In the curves and levels tools, add "Linear" toggles from hell, like in the histogram dockable, and make sure things work right wrt changing and resetting the property, switching from levels to curves, and picking colors. The result currently changes when switching a non-nop curves/levels between perceptual and linear, because adjusting the parameters between the spaces is not implemented yet.
961 lines
30 KiB
C
961 lines
30 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 <http://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/gimpcurve.h"
|
||
#include "core/gimphistogram.h"
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||
|
||
#include "gimpcurvesconfig.h"
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||
#include "gimplevelsconfig.h"
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||
#include "gimpoperationlevels.h"
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||
|
||
#include "gimp-intl.h"
|
||
|
||
|
||
enum
|
||
{
|
||
PROP_0,
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||
PROP_LINEAR,
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||
PROP_CHANNEL,
|
||
PROP_LOW_INPUT,
|
||
PROP_HIGH_INPUT,
|
||
PROP_CLAMP_INPUT,
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||
PROP_GAMMA,
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||
PROP_LOW_OUTPUT,
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||
PROP_HIGH_OUTPUT,
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||
PROP_CLAMP_OUTPUT
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||
};
|
||
|
||
|
||
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);
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||
|
||
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,
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GimpConfig *b);
|
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static void gimp_levels_config_reset (GimpConfig *config);
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static gboolean gimp_levels_config_copy (GimpConfig *src,
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GimpConfig *dest,
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||
GParamFlags flags);
|
||
|
||
|
||
G_DEFINE_TYPE_WITH_CODE (GimpLevelsConfig, gimp_levels_config,
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GIMP_TYPE_SETTINGS,
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G_IMPLEMENT_INTERFACE (GIMP_TYPE_CONFIG,
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gimp_levels_config_iface_init))
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||
|
||
#define parent_class gimp_levels_config_parent_class
|
||
|
||
|
||
static void
|
||
gimp_levels_config_class_init (GimpLevelsConfigClass *klass)
|
||
{
|
||
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
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GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
|
||
|
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object_class->set_property = gimp_levels_config_set_property;
|
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object_class->get_property = gimp_levels_config_get_property;
|
||
|
||
viewable_class->default_icon_name = "gimp-tool-levels";
|
||
|
||
GIMP_CONFIG_PROP_BOOLEAN (object_class, PROP_LINEAR,
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"linear",
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||
_("Linear"),
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||
_("Work on linear RGB"),
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FALSE, 0);
|
||
|
||
GIMP_CONFIG_PROP_ENUM (object_class, PROP_CHANNEL,
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"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"),
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||
_("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,
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||
"clamp-output",
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||
_("Clamp Output"),
|
||
_("Clamp final output values."),
|
||
FALSE, 0);
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_iface_init (GimpConfigInterface *iface)
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||
{
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iface->serialize = gimp_levels_config_serialize;
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iface->deserialize = gimp_levels_config_deserialize;
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iface->equal = gimp_levels_config_equal;
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iface->reset = gimp_levels_config_reset;
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iface->copy = gimp_levels_config_copy;
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||
}
|
||
|
||
static void
|
||
gimp_levels_config_init (GimpLevelsConfig *self)
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||
{
|
||
gimp_config_reset (GIMP_CONFIG (self));
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||
}
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||
|
||
static void
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||
gimp_levels_config_get_property (GObject *object,
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guint property_id,
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GValue *value,
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||
GParamSpec *pspec)
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||
{
|
||
GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
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||
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switch (property_id)
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{
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case PROP_LINEAR:
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g_value_set_boolean (value, self->linear);
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break;
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||
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||
case PROP_CHANNEL:
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g_value_set_enum (value, self->channel);
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break;
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||
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||
case PROP_LOW_INPUT:
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g_value_set_double (value, self->low_input[self->channel]);
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break;
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||
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case PROP_HIGH_INPUT:
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g_value_set_double (value, self->high_input[self->channel]);
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break;
|
||
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||
case PROP_CLAMP_INPUT:
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g_value_set_boolean (value, self->clamp_input);
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||
break;
|
||
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||
case PROP_GAMMA:
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g_value_set_double (value, self->gamma[self->channel]);
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break;
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||
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case PROP_LOW_OUTPUT:
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g_value_set_double (value, self->low_output[self->channel]);
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break;
|
||
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||
case PROP_HIGH_OUTPUT:
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g_value_set_double (value, self->high_output[self->channel]);
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break;
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||
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case PROP_CLAMP_OUTPUT:
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g_value_set_boolean (value, self->clamp_output);
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||
break;
|
||
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||
default:
|
||
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
|
||
break;
|
||
}
|
||
}
|
||
|
||
static void
|
||
gimp_levels_config_set_property (GObject *object,
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||
guint property_id,
|
||
const GValue *value,
|
||
GParamSpec *pspec)
|
||
{
|
||
GimpLevelsConfig *self = GIMP_LEVELS_CONFIG (object);
|
||
|
||
switch (property_id)
|
||
{
|
||
case PROP_LINEAR:
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||
self->linear = g_value_get_boolean (value);
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||
break;
|
||
|
||
case PROP_CHANNEL:
|
||
self->channel = g_value_get_enum (value);
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||
g_object_notify (object, "low-input");
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||
g_object_notify (object, "high-input");
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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_config_serialize_property_by_name (config, "time", writer) ||
|
||
! gimp_config_serialize_property_by_name (config, "linear", writer) ||
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||
! 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'
|
||
* "time" property doesn'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 (config_a->linear != config_b->linear ||
|
||
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;
|
||
|
||
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), "linear");
|
||
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;
|
||
|
||
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->linear = src_config->linear;
|
||
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), "linear");
|
||
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 (GimpHistogramChannel channel,
|
||
const GimpRGB *color)
|
||
{
|
||
switch (channel)
|
||
{
|
||
case GIMP_HISTOGRAM_VALUE:
|
||
return MAX (MAX (color->r, color->g), color->b);
|
||
|
||
case GIMP_HISTOGRAM_RED:
|
||
return color->r;
|
||
|
||
case GIMP_HISTOGRAM_GREEN:
|
||
return color->g;
|
||
|
||
case GIMP_HISTOGRAM_BLUE:
|
||
return color->b;
|
||
|
||
case GIMP_HISTOGRAM_ALPHA:
|
||
return color->a;
|
||
|
||
case GIMP_HISTOGRAM_RGB:
|
||
return MIN (MIN (color->r, color->g), color->b);
|
||
|
||
case GIMP_HISTOGRAM_LUMINANCE:
|
||
return GIMP_RGB_LUMINANCE (color->r, color->g, color->b);
|
||
}
|
||
|
||
return 0.0;
|
||
}
|
||
|
||
void
|
||
gimp_levels_config_adjust_by_colors (GimpLevelsConfig *config,
|
||
GimpHistogramChannel channel,
|
||
const GimpRGB *black,
|
||
const GimpRGB *gray,
|
||
const GimpRGB *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 (channel,
|
||
black);
|
||
g_object_notify (G_OBJECT (config), "low-input");
|
||
}
|
||
|
||
|
||
if (white)
|
||
{
|
||
config->high_input[channel] = gimp_levels_config_input_from_color (channel,
|
||
white);
|
||
g_object_notify (G_OBJECT (config), "high-input");
|
||
}
|
||
|
||
if (gray)
|
||
{
|
||
gdouble input;
|
||
gdouble range;
|
||
gdouble inten;
|
||
gdouble out_light;
|
||
gdouble lightness;
|
||
|
||
/* Calculate lightness value */
|
||
lightness = GIMP_RGB_LUMINANCE (gray->r, gray->g, gray->b);
|
||
|
||
input = gimp_levels_config_input_from_color (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);
|
||
|
||
curves->linear = config->linear;
|
||
|
||
for (channel = GIMP_HISTOGRAM_VALUE;
|
||
channel <= GIMP_HISTOGRAM_ALPHA;
|
||
channel++)
|
||
{
|
||
GimpCurve *curve = curves->curve[channel];
|
||
const gint n_points = gimp_curve_get_n_points (curve);
|
||
static const gint n = 8;
|
||
gint point = -1;
|
||
gdouble gamma = config->gamma[channel];
|
||
gdouble delta_in;
|
||
gdouble delta_out;
|
||
gdouble x, y;
|
||
|
||
/* clear the points set by default */
|
||
gimp_curve_set_point (curve, 0, -1, -1);
|
||
gimp_curve_set_point (curve, n_points - 1, -1, -1);
|
||
|
||
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];
|
||
|
||
point = CLAMP (n_points * x, point + 1, n_points - 1 - n);
|
||
gimp_curve_set_point (curve, point, 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);
|
||
point = CLAMP (n_points * x, point + 1, n_points - 1 - n + i);
|
||
gimp_curve_set_point (curve, point, 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);
|
||
point = CLAMP (n_points * x, point + 1, n_points - 1 - n + i);
|
||
gimp_curve_set_point (curve, point, x, y);
|
||
}
|
||
|
||
g_object_unref (config_inv);
|
||
}
|
||
}
|
||
|
||
x = config->high_input[channel];
|
||
y = config->high_output[channel];
|
||
|
||
point = CLAMP (n_points * x, point + 1, n_points - 1);
|
||
gimp_curve_set_point (curve, point, 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 = g_data_input_stream_read_line (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 = g_data_input_stream_read_line (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->linear = FALSE;
|
||
config->clamp_input = TRUE;
|
||
config->clamp_output = TRUE;
|
||
|
||
g_object_notify (G_OBJECT (config), "linear");
|
||
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_formatd (buf, G_ASCII_DTOSTR_BUF_SIZE, "%f",
|
||
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;
|
||
}
|