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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimphistogram module Copyright (C) 1999 Jay Cox <jaycox@earthlink.net>
*
* 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/pixel-region.h"
#include "gimpdrawable.h"
#include "gimpimage.h"
void
gimp_drawable_calculate_histogram (GimpDrawable *drawable,
GimpHistogram *histogram)
{
PixelRegion region;
PixelRegion mask;
gint x1, y1, x2, y2;
gboolean have_mask;
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (histogram != NULL);
have_mask = gimp_drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
if ((x1 == x2) || (y1 == y2))
return;
pixel_region_init (®ion, gimp_drawable_data (drawable),
x1, y1, (x2 - x1), (y2 - y1), FALSE);
if (have_mask)
{
GimpChannel *sel_mask;
GimpImage *gimage;
gint off_x, off_y;
gimage = gimp_item_get_image (GIMP_ITEM (drawable));
sel_mask = gimp_image_get_mask (gimage);
gimp_item_offsets (GIMP_ITEM (drawable), &off_x, &off_y);
pixel_region_init (&mask, gimp_drawable_data (GIMP_DRAWABLE (sel_mask)),
x1 + off_x, y1 + off_y, (x2 - x1), (y2 - y1), FALSE);
gimp_histogram_calculate (histogram, ®ion, &mask);
}
else
{
gimp_histogram_calculate (histogram, ®ion, NULL);
}
}
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