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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.h>
#include "core-types.h"
#include "base/pixel-region.h"
#include "gimpdrawable.h"
#include "gimpdrawable-desaturate.h"
#include "gimpimage.h"
#include "gimp-intl.h"
void
gimp_drawable_desaturate (GimpDrawable *drawable)
{
PixelRegion srcPR, destPR;
guchar *src, *s;
guchar *dest, *d;
gint h, j;
gint lightness, min, max;
gboolean has_alpha;
gpointer pr;
gint x, y, width, height;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_drawable_is_rgb (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
has_alpha = gimp_drawable_has_alpha (drawable);
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
return;
pixel_region_init (&srcPR, gimp_drawable_data (drawable),
x, y, width, height, FALSE);
pixel_region_init (&destPR, gimp_drawable_shadow (drawable),
x, y, width, height, TRUE);
for (pr = pixel_regions_register (2, &srcPR, &destPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
src = srcPR.data;
dest = destPR.data;
h = srcPR.h;
while (h--)
{
s = src;
d = dest;
for (j = 0; j < srcPR.w; j++)
{
max = MAX (s[RED_PIX], s[GREEN_PIX]);
max = MAX (max, s[BLUE_PIX]);
min = MIN (s[RED_PIX], s[GREEN_PIX]);
min = MIN (min, s[BLUE_PIX]);
lightness = (max + min) / 2;
d[RED_PIX] = lightness;
d[GREEN_PIX] = lightness;
d[BLUE_PIX] = lightness;
if (has_alpha)
d[ALPHA_PIX] = s[ALPHA_PIX];
d += destPR.bytes;
s += srcPR.bytes;
}
src += srcPR.rowstride;
dest += destPR.rowstride;
}
}
gimp_drawable_merge_shadow (drawable, TRUE, _("Desaturate"));
gimp_drawable_update (drawable, x, y, width, height);
}
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