gimp/app/core/gimpdrawable-equalize.c

81 lines
2.4 KiB
C

/* 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/gimphistogram.h"
#include "base/gimplut.h"
#include "base/lut-funcs.h"
#include "base/pixel-processor.h"
#include "base/pixel-region.h"
#include "gimp.h"
#include "gimpdrawable.h"
#include "gimpdrawable-equalize.h"
#include "gimpdrawable-histogram.h"
#include "gimpimage.h"
#include "gimp-intl.h"
void
gimp_drawable_equalize (GimpDrawable *drawable,
gboolean mask_only)
{
PixelRegion srcPR, destPR;
gint bytes;
gint x, y, width, height;
GimpHistogram *hist;
GimpLut *lut;
GimpImage *image;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
image = gimp_item_get_image (GIMP_ITEM (drawable));
bytes = gimp_drawable_bytes (drawable);
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
return;
hist = gimp_histogram_new ();
gimp_drawable_calculate_histogram (drawable, hist);
lut = equalize_lut_new (hist, bytes);
/* Apply the histogram */
pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
x, y, width, height, FALSE);
pixel_region_init (&destPR, gimp_drawable_get_shadow_tiles (drawable),
x, y, width, height, TRUE);
pixel_regions_process_parallel ((PixelProcessorFunc) gimp_lut_process,
lut, 2, &srcPR, &destPR);
gimp_lut_free (lut);
gimp_histogram_free (hist);
gimp_drawable_merge_shadow (drawable, TRUE, _("Equalize"));
gimp_drawable_update (drawable, x, y, width, height);
}