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-rw-r--r--app/operations/gimpoperationposterize.c165
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diff --git a/app/operations/gimpoperationposterize.c b/app/operations/gimpoperationposterize.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpoperationposterize.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 <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "libgimpconfig/gimpconfig.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "operations-types.h"
+
+#include "gimpoperationposterize.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_LEVELS
+};
+
+
+static void gimp_operation_posterize_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_operation_posterize_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_operation_posterize_process (GeglOperation *operation,
+ void *in_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level);
+
+
+G_DEFINE_TYPE (GimpOperationPosterize, gimp_operation_posterize,
+ GIMP_TYPE_OPERATION_POINT_FILTER)
+
+#define parent_class gimp_operation_posterize_parent_class
+
+
+static void
+gimp_operation_posterize_class_init (GimpOperationPosterizeClass *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_posterize_set_property;
+ object_class->get_property = gimp_operation_posterize_get_property;
+
+ point_class->process = gimp_operation_posterize_process;
+
+ gegl_operation_class_set_keys (operation_class,
+ "name", "gimp:posterize",
+ "categories", "color",
+ "description", _("Reduce to a limited set of colors"),
+ NULL);
+
+ GIMP_CONFIG_PROP_INT (object_class, PROP_LEVELS,
+ "levels",
+ _("Posterize levels"),
+ NULL,
+ 2, 256, 3,
+ GIMP_PARAM_STATIC_STRINGS);
+}
+
+static void
+gimp_operation_posterize_init (GimpOperationPosterize *self)
+{
+}
+
+static void
+gimp_operation_posterize_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (object);
+
+ switch (property_id)
+ {
+ case PROP_LEVELS:
+ g_value_set_int (value, posterize->levels);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_operation_posterize_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (object);
+
+ switch (property_id)
+ {
+ case PROP_LEVELS:
+ posterize->levels = g_value_get_int (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_operation_posterize_process (GeglOperation *operation,
+ void *in_buf,
+ void *out_buf,
+ glong samples,
+ const GeglRectangle *roi,
+ gint level)
+{
+ GimpOperationPosterize *posterize = GIMP_OPERATION_POSTERIZE (operation);
+ gfloat *src = in_buf;
+ gfloat *dest = out_buf;
+ gfloat levels;
+
+ levels = posterize->levels - 1.0;
+
+ while (samples--)
+ {
+ dest[RED] = RINT (src[RED] * levels) / levels;
+ dest[GREEN] = RINT (src[GREEN] * levels) / levels;
+ dest[BLUE] = RINT (src[BLUE] * levels) / levels;
+ dest[ALPHA] = RINT (src[ALPHA] * levels) / levels;
+
+ src += 4;
+ dest += 4;
+ }
+
+ return TRUE;
+}