mirror of https://github.com/GNOME/gimp.git
155 lines
4.9 KiB
C
155 lines
4.9 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationdesaturate.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 <http://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 "libgimpcolor/gimpcolor.h"
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#include "operations-types.h"
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#include "gimpoperationdesaturate.h"
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#include "gimpdesaturateconfig.h"
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static gboolean gimp_operation_desaturate_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 (GimpOperationDesaturate, gimp_operation_desaturate,
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GIMP_TYPE_OPERATION_POINT_FILTER)
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#define parent_class gimp_operation_desaturate_parent_class
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static void
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gimp_operation_desaturate_class_init (GimpOperationDesaturateClass *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 = gimp_operation_point_filter_set_property;
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object_class->get_property = gimp_operation_point_filter_get_property;
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:desaturate",
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"categories", "color",
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"description", "GIMP Desaturate operation",
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NULL);
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point_class->process = gimp_operation_desaturate_process;
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g_object_class_install_property (object_class,
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GIMP_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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GIMP_TYPE_DESATURATE_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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gimp_operation_desaturate_init (GimpOperationDesaturate *self)
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{
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}
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static gboolean
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gimp_operation_desaturate_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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GimpOperationPointFilter *point = GIMP_OPERATION_POINT_FILTER (operation);
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GimpDesaturateConfig *config = GIMP_DESATURATE_CONFIG (point->config);
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gfloat *src = in_buf;
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gfloat *dest = out_buf;
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if (! config)
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return FALSE;
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switch (config->mode)
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{
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case GIMP_DESATURATE_LIGHTNESS:
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while (samples--)
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{
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gfloat min, max, value;
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max = MAX (src[0], src[1]);
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max = MAX (max, src[2]);
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min = MIN (src[0], src[1]);
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min = MIN (min, src[2]);
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value = (max + min) / 2;
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dest[0] = value;
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dest[1] = value;
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dest[2] = value;
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case GIMP_DESATURATE_LUMINOSITY:
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while (samples--)
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{
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gfloat value = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]);
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dest[0] = value;
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dest[1] = value;
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dest[2] = value;
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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case GIMP_DESATURATE_AVERAGE:
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while (samples--)
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{
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gfloat value = (src[0] + src[1] + src[2]) / 3;
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dest[0] = value;
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dest[1] = value;
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dest[2] = value;
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dest[3] = src[3];
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src += 4;
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dest += 4;
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}
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break;
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}
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return TRUE;
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}
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