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Diffstat (limited to 'app/operations/gimpoperationposterize.c')
| -rw-r--r-- | app/operations/gimpoperationposterize.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/app/operations/gimpoperationposterize.c b/app/operations/gimpoperationposterize.c new file mode 100644 index 0000000..88f5d26 --- /dev/null +++ b/app/operations/gimpoperationposterize.c @@ -0,0 +1,165 @@ +/* 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; +} |