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gimp/app/gegl/gimpoperationhuesaturation.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationhuesaturation.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 <cairo.h>
#include <gegl.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "gimp-gegl-types.h"
#include "gimphuesaturationconfig.h"
#include "gimpoperationhuesaturation.h"
static gboolean gimp_operation_hue_saturation_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi);
G_DEFINE_TYPE (GimpOperationHueSaturation, gimp_operation_hue_saturation,
GIMP_TYPE_OPERATION_POINT_FILTER)
#define parent_class gimp_operation_hue_saturation_parent_class
static void
gimp_operation_hue_saturation_class_init (GimpOperationHueSaturationClass *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_point_filter_set_property;
object_class->get_property = gimp_operation_point_filter_get_property;
operation_class->name = "gimp:hue-saturation";
operation_class->categories = "color";
operation_class->description = "GIMP Hue-Saturation operation";
point_class->process = gimp_operation_hue_saturation_process;
g_object_class_install_property (object_class,
GIMP_OPERATION_POINT_FILTER_PROP_CONFIG,
g_param_spec_object ("config",
"Config",
"The config object",
GIMP_TYPE_HUE_SATURATION_CONFIG,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_operation_hue_saturation_init (GimpOperationHueSaturation *self)
{
}
static inline gdouble
map_hue (GimpHueSaturationConfig *config,
GimpHueRange range,
gdouble value)
{
value += (config->hue[GIMP_ALL_HUES] + config->hue[range]) / 2.0;
if (value < 0)
return value + 1.0;
else if (value > 1.0)
return value - 1.0;
else
return value;
}
static inline gdouble
map_saturation (GimpHueSaturationConfig *config,
GimpHueRange range,
gdouble value)
{
gdouble v = config->saturation[GIMP_ALL_HUES] + config->saturation[range];
/* This change affects the way saturation is computed. With the old
* code (different code for value < 0), increasing the saturation
* affected muted colors very much, and bright colors less. With the
* new code, it affects muted colors and bright colors more or less
* evenly. For enhancing the color in photos, the new behavior is
* exactly what you want. It's hard for me to imagine a case in
* which the old behavior is better.
*/
value *= (v + 1.0);
return CLAMP (value, 0.0, 1.0);
}
static inline gdouble
map_lightness (GimpHueSaturationConfig *config,
GimpHueRange range,
gdouble value)
{
gdouble v = (config->lightness[GIMP_ALL_HUES] + config->lightness[range]) / 2.0;
if (v < 0)
return value * (v + 1.0);
else
return value + (v * (1.0 - value));
}
static gboolean
gimp_operation_hue_saturation_process (GeglOperation *operation,
void *in_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi)
{
GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
GimpHueSaturationConfig *config = GIMP_HUE_SATURATION_CONFIG (point->config);
gfloat *src = in_buf;
gfloat *dest = out_buf;
gfloat overlap;
if (! config)
return FALSE;
overlap = config->overlap / 2.0;
while (samples--)
{
GimpRGB rgb;
GimpHSL hsl;
gdouble h;
gint hue_counter;
gint hue = 0;
gint secondary_hue = 0;
gboolean use_secondary_hue = FALSE;
gfloat primary_intensity = 0.0;
gfloat secondary_intensity = 0.0;
rgb.r = src[RED];
rgb.g = src[GREEN];
rgb.b = src[BLUE];
gimp_rgb_to_hsl (&rgb, &hsl);
h = hsl.h * 6.0;
for (hue_counter = 0; hue_counter < 7; hue_counter++)
{
gdouble hue_threshold = (gdouble) hue_counter + 0.5;
if (h < ((gdouble) hue_threshold + overlap))
{
hue = hue_counter;
if (overlap > 0.0 && h > ((gdouble) hue_threshold - overlap))
{
use_secondary_hue = TRUE;
secondary_hue = hue_counter + 1;
secondary_intensity =
(h - (gdouble) hue_threshold + overlap) / (2.0 * overlap);
primary_intensity = 1.0 - secondary_intensity;
}
else
{
use_secondary_hue = FALSE;
}
break;
}
}
if (hue >= 6)
{
hue = 0;
use_secondary_hue = FALSE;
}
if (secondary_hue >= 6)
{
secondary_hue = 0;
}
/* transform into GimpHueRange values */
hue++;
secondary_hue++;
if (use_secondary_hue)
{
gdouble mapped_primary_hue;
gdouble mapped_secondary_hue;
gdouble diff;
mapped_primary_hue = map_hue (config, hue, hsl.h);
mapped_secondary_hue = map_hue (config, secondary_hue, hsl.h);
/* Find nearest hue on the circle between primary and
* secondary hue
*/
diff = mapped_primary_hue - mapped_secondary_hue;
if (diff < -0.5)
{
mapped_secondary_hue -= 1.0;
}
else if (diff >= 0.5)
{
mapped_secondary_hue += 1.0;
}
hsl.h = (mapped_primary_hue * primary_intensity +
mapped_secondary_hue * secondary_intensity);
hsl.s = (map_saturation (config, hue, hsl.s) * primary_intensity +
map_saturation (config, secondary_hue, hsl.s) * secondary_intensity);
hsl.l = (map_lightness (config, hue, hsl.l) * primary_intensity +
map_lightness (config, secondary_hue, hsl.l) * secondary_intensity);
}
else
{
hsl.h = map_hue (config, hue, hsl.h);
hsl.s = map_saturation (config, hue, hsl.s);
hsl.l = map_lightness (config, hue, hsl.l);
}
gimp_hsl_to_rgb (&hsl, &rgb);
dest[RED] = rgb.r;
dest[GREEN] = rgb.g;
dest[BLUE] = rgb.b;
dest[ALPHA] = src[ALPHA];
src += 4;
dest += 4;
}
return TRUE;
}
/* public functions */
void
gimp_operation_hue_saturation_map (GimpHueSaturationConfig *config,
const GimpRGB *color,
GimpHueRange range,
GimpRGB *result)
{
GimpHSL hsl;
g_return_if_fail (GIMP_IS_HUE_SATURATION_CONFIG (config));
g_return_if_fail (color != NULL);
g_return_if_fail (result != NULL);
gimp_rgb_to_hsl (color, &hsl);
hsl.h = map_hue (config, range, hsl.h);
hsl.s = map_saturation (config, range, hsl.s);
hsl.l = map_lightness (config, range, hsl.l);
gimp_hsl_to_rgb (&hsl, result);
}
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