307 lines
10 KiB
C
307 lines
10 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikaoperationhuesaturation.c
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* Copyright (C) 2007 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libpikacolor/pikacolor.h"
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#include "libpikamath/pikamath.h"
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#include "operations-types.h"
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#include "pikahuesaturationconfig.h"
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#include "pikaoperationhuesaturation.h"
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#include "pika-intl.h"
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static gboolean pika_operation_hue_saturation_process (GeglOperation *operation,
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void *in_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *roi,
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gint level);
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G_DEFINE_TYPE (PikaOperationHueSaturation, pika_operation_hue_saturation,
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PIKA_TYPE_OPERATION_POINT_FILTER)
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#define parent_class pika_operation_hue_saturation_parent_class
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static void
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pika_operation_hue_saturation_class_init (PikaOperationHueSaturationClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
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object_class->set_property = pika_operation_point_filter_set_property;
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object_class->get_property = pika_operation_point_filter_get_property;
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gegl_operation_class_set_keys (operation_class,
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"name", "pika:hue-saturation",
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"categories", "color",
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"description", _("Adjust hue, saturation, and lightness"),
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NULL);
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point_class->process = pika_operation_hue_saturation_process;
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g_object_class_install_property (object_class,
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PIKA_OPERATION_POINT_FILTER_PROP_CONFIG,
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g_param_spec_object ("config",
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"Config",
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"The config object",
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PIKA_TYPE_HUE_SATURATION_CONFIG,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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}
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static void
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pika_operation_hue_saturation_init (PikaOperationHueSaturation *self)
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{
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}
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static inline gdouble
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map_hue (PikaHueSaturationConfig *config,
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PikaHueRange range,
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gdouble value)
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{
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value += (config->hue[PIKA_HUE_RANGE_ALL] + config->hue[range]) / 2.0;
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if (value < 0)
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return value + 1.0;
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else if (value > 1.0)
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return value - 1.0;
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else
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return value;
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}
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static inline gdouble
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map_hue_overlap (PikaHueSaturationConfig *config,
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PikaHueRange primary_range,
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PikaHueRange secondary_range,
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gdouble value,
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gdouble primary_intensity,
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gdouble secondary_intensity)
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{
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/* When calculating an overlap between two ranges, interpolate the
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* hue adjustment from config->hue[primary_range] and
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* config->hue[secondary_range] BEFORE mapping it to the input
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* value. This fixes odd edge cases where only one of the ranges
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* crosses the red/magenta wraparound (bug #527085), or if
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* adjustments to different channels yield more than 180 degree
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* difference from each other. (Why anyone would do that is beyond
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* me, but still.)
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*
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* See bugs #527085 and #644032 for examples of such cases.
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*/
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gdouble v = config->hue[primary_range] * primary_intensity +
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config->hue[secondary_range] * secondary_intensity;
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value += (config->hue[PIKA_HUE_RANGE_ALL] + v) / 2.0;
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if (value < 0)
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return value + 1.0;
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else if (value > 1.0)
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return value - 1.0;
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else
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return value;
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}
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static inline gdouble
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map_saturation (PikaHueSaturationConfig *config,
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PikaHueRange range,
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gdouble value)
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{
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gdouble v = config->saturation[PIKA_HUE_RANGE_ALL] + config->saturation[range];
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/* This change affects the way saturation is computed. With the old
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* code (different code for value < 0), increasing the saturation
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* affected muted colors very much, and bright colors less. With the
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* new code, it affects muted colors and bright colors more or less
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* evenly. For enhancing the color in photos, the new behavior is
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* exactly what you want. It's hard for me to imagine a case in
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* which the old behavior is better.
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*/
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value *= (v + 1.0);
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return CLAMP (value, 0.0, 1.0);
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}
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static inline gdouble
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map_lightness (PikaHueSaturationConfig *config,
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PikaHueRange range,
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gdouble value)
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{
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gdouble v = (config->lightness[PIKA_HUE_RANGE_ALL] + config->lightness[range]);
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if (v < 0)
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return value * (v + 1.0);
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else
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return value + (v * (1.0 - value));
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}
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static gboolean
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pika_operation_hue_saturation_process (GeglOperation *operation,
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void *in_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *roi,
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gint level)
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{
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PikaOperationPointFilter *point = PIKA_OPERATION_POINT_FILTER (operation);
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PikaHueSaturationConfig *config = PIKA_HUE_SATURATION_CONFIG (point->config);
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gfloat *src = in_buf;
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gfloat *dest = out_buf;
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gfloat overlap;
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if (! config)
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return FALSE;
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overlap = config->overlap / 2.0;
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while (samples--)
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{
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PikaRGB rgb;
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PikaHSL hsl;
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gdouble h;
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gint hue_counter;
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gint hue = 0;
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gint secondary_hue = 0;
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gboolean use_secondary_hue = FALSE;
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gfloat primary_intensity = 0.0;
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gfloat secondary_intensity = 0.0;
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rgb.r = src[RED];
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rgb.g = src[GREEN];
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rgb.b = src[BLUE];
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rgb.a = src[ALPHA];
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pika_rgb_to_hsl (&rgb, &hsl);
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h = hsl.h * 6.0;
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for (hue_counter = 0; hue_counter < 7; hue_counter++)
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{
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gdouble hue_threshold = (gdouble) hue_counter + 0.5;
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if (h < ((gdouble) hue_threshold + overlap))
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{
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hue = hue_counter;
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if (overlap > 0.0 && h > ((gdouble) hue_threshold - overlap))
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{
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use_secondary_hue = TRUE;
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secondary_hue = hue_counter + 1;
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secondary_intensity =
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(h - (gdouble) hue_threshold + overlap) / (2.0 * overlap);
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primary_intensity = 1.0 - secondary_intensity;
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}
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else
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{
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use_secondary_hue = FALSE;
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}
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break;
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}
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}
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if (hue >= 6)
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{
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hue = 0;
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use_secondary_hue = FALSE;
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}
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if (secondary_hue >= 6)
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{
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secondary_hue = 0;
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}
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/* transform into PikaHueRange values */
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hue++;
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secondary_hue++;
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if (use_secondary_hue)
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{
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hsl.h = map_hue_overlap (config, hue, secondary_hue, hsl.h,
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primary_intensity, secondary_intensity);
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hsl.s = (map_saturation (config, hue, hsl.s) * primary_intensity +
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map_saturation (config, secondary_hue, hsl.s) * secondary_intensity);
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hsl.l = (map_lightness (config, hue, hsl.l) * primary_intensity +
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map_lightness (config, secondary_hue, hsl.l) * secondary_intensity);
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}
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else
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{
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hsl.h = map_hue (config, hue, hsl.h);
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hsl.s = map_saturation (config, hue, hsl.s);
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hsl.l = map_lightness (config, hue, hsl.l);
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}
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pika_hsl_to_rgb (&hsl, &rgb);
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dest[RED] = rgb.r;
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dest[GREEN] = rgb.g;
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dest[BLUE] = rgb.b;
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dest[ALPHA] = rgb.a;
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src += 4;
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dest += 4;
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}
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return TRUE;
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}
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/* public functions */
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void
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pika_operation_hue_saturation_map (PikaHueSaturationConfig *config,
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const PikaRGB *color,
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PikaHueRange range,
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PikaRGB *result)
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{
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PikaHSL hsl;
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g_return_if_fail (PIKA_IS_HUE_SATURATION_CONFIG (config));
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g_return_if_fail (color != NULL);
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g_return_if_fail (result != NULL);
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pika_rgb_to_hsl (color, &hsl);
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hsl.h = map_hue (config, range, hsl.h);
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hsl.s = map_saturation (config, range, hsl.s);
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hsl.l = map_lightness (config, range, hsl.l);
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pika_hsl_to_rgb (&hsl, result);
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}
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