mirror of https://github.com/GNOME/gimp.git
469 lines
9.7 KiB
C
469 lines
9.7 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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* gimphistogram module Copyright (C) 1999 Jay Cox <jaycox@earthlink.net>
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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 "config.h"
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#ifdef ENABLE_MP
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#include <pthread.h>
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#endif /* ENABLE_MP */
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#include <glib.h>
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#include "libgimpmath/gimpmath.h"
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#include "base-types.h"
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#include "base-config.h"
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#include "gimphistogram.h"
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#include "pixel-processor.h"
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#include "pixel-region.h"
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struct _GimpHistogram
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{
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gint bins;
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gdouble **values;
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gint n_channels;
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#ifdef ENABLE_MP
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pthread_mutex_t mutex;
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gint nthreads;
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gdouble ***tmp_values;
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gchar *tmp_slots;
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#endif /* ENABLE_MP */
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};
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GimpHistogram *
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gimp_histogram_new (void)
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{
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GimpHistogram *histogram;
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histogram = g_new0 (GimpHistogram, 1);
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histogram->bins = 0;
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histogram->values = NULL;
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histogram->n_channels = 0;
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#ifdef ENABLE_MP
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histogram->nthreads = 0;
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histogram->tmp_values = NULL;
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histogram->tmp_slots = NULL;
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#endif /* ENABLE_MP */
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return histogram;
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}
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void
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gimp_histogram_free (GimpHistogram *histogram)
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{
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gint i;
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if (histogram->values)
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{
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for (i = 0; i < histogram->n_channels; i++)
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g_free (histogram->values[i]);
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g_free (histogram->values);
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}
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g_free (histogram);
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}
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static void
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gimp_histogram_calculate_sub_region (GimpHistogram *histogram,
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PixelRegion *region,
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PixelRegion *mask)
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{
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const guchar *src, *msrc;
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const guchar *m, *s;
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gdouble **values;
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gint h, w, max;
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#ifdef ENABLE_MP
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gint slot = 0;
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/* find an unused temporary slot to put our results in and lock it */
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pthread_mutex_lock (&histogram->mutex);
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{
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while (histogram->tmp_slots[slot])
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slot++;
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values = histogram->tmp_values[slot];
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histogram->tmp_slots[slot] = 1;
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}
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pthread_mutex_unlock (&histogram->mutex);
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#else /* !ENABLE_MP */
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values = histogram->values;
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#endif
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h = region->h;
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w = region->w;
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if (mask)
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{
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gdouble masked;
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src = region->data;
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msrc = mask->data;
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while (h--)
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{
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s = src;
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m = msrc;
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w = region->w;
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switch(region->bytes)
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{
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case 1:
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while (w--)
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{
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masked = m[0] / 255.0;
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values[0][s[0]] += masked;
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s += 1;
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m += 1;
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}
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break;
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case 2:
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while (w--)
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{
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masked = m[0] / 255.0;
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values[0][s[0]] += masked;
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values[1][s[1]] += masked;
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s += 2;
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m += 1;
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}
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break;
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case 3: /* calculate seperate value values */
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while (w--)
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{
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masked = m[0] / 255.0;
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values[1][s[0]] += masked;
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values[2][s[1]] += masked;
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values[3][s[2]] += masked;
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max = (s[0] > s[1]) ? s[0] : s[1];
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if (s[2] > max)
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values[0][s[2]] += masked;
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else
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values[0][max] += masked;
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s += 3;
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m += 1;
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}
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break;
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case 4: /* calculate seperate value values */
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while (w--)
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{
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masked = m[0] / 255.0;
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values[1][s[0]] += masked;
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values[2][s[1]] += masked;
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values[3][s[2]] += masked;
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values[4][s[3]] += masked;
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max = (s[0] > s[1]) ? s[0] : s[1];
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if (s[2] > max)
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values[0][s[2]] += masked;
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else
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values[0][max] += masked;
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s += 3;
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m += 1;
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}
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break;
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}
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src += region->rowstride;
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msrc += mask->rowstride;
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}
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}
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else /* no mask */
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{
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src = region->data;
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while (h--)
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{
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s = src;
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w = region->w;
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switch(region->bytes)
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{
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case 1:
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while (w--)
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{
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values[0][s[0]] += 1.0;
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s += 1;
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}
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break;
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case 2:
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while (w--)
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{
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values[0][s[0]] += 1.0;
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values[1][s[1]] += 1.0;
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s += 2;
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}
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break;
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case 3: /* calculate seperate value values */
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while (w--)
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{
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values[1][s[0]] += 1.0;
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values[2][s[1]] += 1.0;
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values[3][s[2]] += 1.0;
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max = (s[0] > s[1]) ? s[0] : s[1];
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if (s[2] > max)
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values[0][s[2]] += 1.0;
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else
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values[0][max] += 1.0;
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s += 3;
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}
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break;
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case 4: /* calculate seperate value values */
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while (w--)
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{
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values[1][s[0]] += 1.0;
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values[2][s[1]] += 1.0;
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values[3][s[2]] += 1.0;
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values[4][s[3]] += 1.0;
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max = (s[0] > s[1]) ? s[0] : s[1];
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if (s[2] > max)
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values[0][s[2]] += 1.0;
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else
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values[0][max] += 1.0;
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s += 4;
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}
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break;
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}
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src += region->rowstride;
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}
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}
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#ifdef ENABLE_MP
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/* unlock this slot */
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/* we shouldn't have to use mutex locks here */
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pthread_mutex_lock (&histogram->mutex);
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histogram->tmp_slots[slot] = 0;
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pthread_mutex_unlock (&histogram->mutex);
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#endif
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}
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static void
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gimp_histogram_alloc (GimpHistogram *histogram,
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gint bytes)
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{
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gint i;
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if (bytes + 1 != histogram->n_channels)
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{
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if (histogram->values)
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{
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for (i = 0; i < histogram->n_channels; i++)
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g_free (histogram->values[i]);
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g_free (histogram->values);
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}
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histogram->n_channels = bytes + 1;
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histogram->values = g_new0 (gdouble *, histogram->n_channels);
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for (i = 0; i < histogram->n_channels; i++)
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histogram->values[i] = g_new (double, 256);
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}
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}
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void
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gimp_histogram_calculate (GimpHistogram *histogram,
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PixelRegion *region,
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PixelRegion *mask)
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{
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gint i, j;
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#ifdef ENABLE_MP
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gint k;
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#endif
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gimp_histogram_alloc (histogram, region->bytes);
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#ifdef ENABLE_MP
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pthread_mutex_init (&histogram->mutex, NULL);
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histogram->tmp_slots = g_new0 (gchar, base_config->num_processors);
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histogram->tmp_values = g_new0 (gdouble **, base_config->num_processors);
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for (i = 0; i < base_config->num_processors; i++)
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{
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histogram->tmp_values[i] = g_new0 (double *, histogram->n_channels);
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histogram->tmp_slots[i] = 0;
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for (j = 0; j < histogram->n_channels; j++)
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{
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histogram->tmp_values[i][j] = g_new0 (gdouble, 256);
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for (k = 0; k < 256; k++)
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histogram->tmp_values[i][j][k] = 0.0;
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}
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}
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#endif
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for (i = 0; i < histogram->n_channels; i++)
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for (j = 0; j < 256; j++)
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histogram->values[i][j] = 0.0;
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pixel_regions_process_parallel ((p_func)gimp_histogram_calculate_sub_region,
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histogram, 2, region, mask);
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#ifdef ENABLE_MP
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/* add up all the tmp buffers and free their memmory */
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for (i = 0; i < base_config->num_processors; i++)
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{
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for (j = 0; j < histogram->n_channels; j++)
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{
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for (k = 0; k < 256; k++)
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histogram->values[j][k] += histogram->tmp_values[i][j][k];
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g_free (histogram->tmp_values[i][j]);
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}
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g_free (histogram->tmp_values[i]);
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}
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g_free (histogram->tmp_values);
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g_free (histogram->tmp_slots);
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#endif
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}
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gdouble
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gimp_histogram_get_maximum (GimpHistogram *histogram,
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GimpHistogramChannel channel)
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{
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gdouble max = 0.0;
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gint x;
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for (x = 0; x < 256; x++)
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if (histogram->values[channel][x] > max)
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max = histogram->values[channel][x];
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return max;
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}
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gdouble
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gimp_histogram_get_value (GimpHistogram *histogram,
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GimpHistogramChannel channel,
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gint bin)
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{
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if (channel < histogram->n_channels && bin >= 0 && bin < 256)
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return histogram->values[channel][bin];
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return 0.0;
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}
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gdouble
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gimp_histogram_get_channel (GimpHistogram *histogram,
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GimpHistogramChannel channel,
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gint bin)
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{
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if (histogram->n_channels > 3)
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return gimp_histogram_get_value (histogram, channel + 1, bin);
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else
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return gimp_histogram_get_value (histogram, channel , bin);
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}
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gint
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gimp_histogram_nchannels (GimpHistogram *histogram)
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{
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return histogram->n_channels - 1;
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}
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gdouble
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gimp_histogram_get_count (GimpHistogram *histogram,
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gint start,
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gint end)
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{
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gint i;
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gdouble count = 0.0;
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for (i = start; i <= end; i++)
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count += histogram->values[0][i];
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return count;
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}
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gdouble
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gimp_histogram_get_mean (GimpHistogram *histogram,
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GimpHistogramChannel channel,
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gint start,
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gint end)
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{
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gint i;
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gdouble mean = 0.0;
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gdouble count;
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for (i = start; i <= end; i++)
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mean += i * histogram->values[channel][i];
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count = gimp_histogram_get_count (histogram, start, end);
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if (count > 0.0)
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return mean / count;
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return mean;
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}
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gint
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gimp_histogram_get_median (GimpHistogram *histogram,
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GimpHistogramChannel channel,
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gint start,
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gint end)
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{
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gint i;
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gdouble sum = 0.0;
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gdouble count;
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count = gimp_histogram_get_count (histogram, start, end);
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for (i = start; i <= end; i++)
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{
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sum += histogram->values[channel][i];
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if (sum * 2 > count)
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return i;
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}
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return -1;
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}
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gdouble
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gimp_histogram_get_std_dev (GimpHistogram *histogram,
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GimpHistogramChannel channel,
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gint start,
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gint end)
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{
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gint i;
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gdouble dev = 0.0;
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gdouble count;
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gdouble mean;
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mean = gimp_histogram_get_mean (histogram, channel, start, end);
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count = gimp_histogram_get_count (histogram, start, end);
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if (count == 0.0)
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count = 1.0;
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for (i = start; i <= end; i++)
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dev += gimp_histogram_get_value (histogram, channel, i) *
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(i - mean) * (i - mean);
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return sqrt (dev / count);
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}
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