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-rw-r--r--app/operations/gimpoperationhuesaturation.c302
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diff --git a/app/operations/gimpoperationhuesaturation.c b/app/operations/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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <cairo.h>
+#include <gegl.h>
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimphuesaturationconfig.h"
+#include "gimpoperationhuesaturation.h"
+
+#include "gimp-intl.h"
+
+
+static gboolean gimp_operation_hue_saturation_process (GeglOperation *operation,
+ void *in_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+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;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:hue-saturation",
+ "categories", "color",
+ "description", _("Adjust hue, saturation, and lightness"),
+ NULL);
+
+ 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_HUE_RANGE_ALL] + 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_hue_overlap (GimpHueSaturationConfig *config,
+ GimpHueRange primary_range,
+ GimpHueRange secondary_range,
+ gdouble value,
+ gdouble primary_intensity,
+ gdouble secondary_intensity)
+{
+ /* When calculating an overlap between two ranges, interpolate the
+ * hue adjustment from config->hue[primary_range] and
+ * config->hue[secondary_range] BEFORE mapping it to the input
+ * value. This fixes odd edge cases where only one of the ranges
+ * crosses the red/magenta wraparound (bug #527085), or if
+ * adjustments to different channels yield more than 180 degree
+ * difference from each other. (Why anyone would do that is beyond
+ * me, but still.)
+ *
+ * See bugs #527085 and #644032 for examples of such cases.
+ */
+ gdouble v = config->hue[primary_range] * primary_intensity +
+ config->hue[secondary_range] * secondary_intensity;
+
+ value += (config->hue[GIMP_HUE_RANGE_ALL] + v) / 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_HUE_RANGE_ALL] + 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_HUE_RANGE_ALL] + 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,
+ gint level)
+{
+ 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];
+ rgb.a = src[ALPHA];
+
+ 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)
+ {
+ hsl.h = map_hue_overlap (config, hue, secondary_hue, hsl.h,
+ primary_intensity, 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] = rgb.a;
+
+ 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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