mirror of https://github.com/GNOME/gimp.git
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "drawable.h"
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#include "equalize.h"
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#include "gimage.h"
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#include "gimplut.h"
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#include "lut_funcs.h"
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#include "gimphistogram.h"
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#include "libgimp/gimpintl.h"
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void
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image_equalize (void *gimage_ptr)
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{
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GimpImage *gimage;
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GimpDrawable *drawable;
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gimage = (GimpImage *) gimage_ptr;
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drawable = gimage_active_drawable (gimage);
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if (gimp_drawable_indexed (drawable))
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{
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g_message (_("Equalize does not operate on indexed drawables."));
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return;
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}
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equalize (gimage, drawable, TRUE);
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}
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void
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equalize (GimpImage *gimage,
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GimpDrawable *drawable,
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gboolean mask_only)
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{
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PixelRegion srcPR, destPR;
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unsigned char *mask;
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int has_alpha;
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int alpha, bytes;
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int x1, y1, x2, y2;
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GimpHistogram *hist;
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GimpLut *lut;
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mask = NULL;
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bytes = drawable_bytes (drawable);
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has_alpha = drawable_has_alpha (drawable);
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alpha = has_alpha ? (bytes - 1) : bytes;
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hist = gimp_histogram_new();
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gimp_histogram_calculate_drawable(hist, drawable);
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/* Build equalization LUT */
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lut = eq_histogram_lut_new (hist, bytes);
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/* Apply the histogram */
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drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2);
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pixel_region_init (&srcPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
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pixel_region_init (&destPR, drawable_shadow (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
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pixel_regions_process_parallel((p_func)gimp_lut_process, lut,
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2, &srcPR, &destPR);
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gimp_lut_free(lut);
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gimp_histogram_free(hist);
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drawable_merge_shadow (drawable, TRUE);
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drawable_update (drawable, x1, y1, (x2 - x1), (y2 - y1));
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}
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