mirror of https://github.com/GNOME/gimp.git
405 lines
9.4 KiB
C
405 lines
9.4 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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* 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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#include "gimphistogramP.h"
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#include "gimphistogram.h"
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#include "pixel_region.h"
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#include "gimpdrawable.h"
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#include "channel.h"
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#include "gimpimage.h"
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#include "gimprc.h"
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#include <glib.h>
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#include <math.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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GimpHistogram *
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gimp_histogram_new()
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{
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GimpHistogram *histogram;
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histogram = g_new(GimpHistogram, 1);
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histogram->values = NULL;
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histogram->nchannels = 0;
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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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int i;
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if (histogram->values)
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{
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for (i = 0; i < histogram->nchannels; 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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void
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gimp_histogram_calculate_sub_region(GimpHistogram *histogram,
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PixelRegion *region, PixelRegion *mask)
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{
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const unsigned char *src, *msrc;
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const unsigned char *m, *s;
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double **values;
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int h, w, max;
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#ifdef ENABLE_MP
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int 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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double masked;
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src = region->data;
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msrc = region->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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} 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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} 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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} 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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} 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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} 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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} 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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} 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 += 3;
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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 gimp_histogram_alloc(GimpHistogram *histogram, int bytes)
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{
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int i;
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if (bytes + 1 != histogram->nchannels)
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{
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if (histogram->values)
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{
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for (i = 0; i < histogram->nchannels; 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->nchannels = bytes + 1;
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histogram->values = g_new(double *, histogram->nchannels);
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for (i = 0; i < histogram->nchannels; 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, PixelRegion *region,
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PixelRegion *mask)
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{
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int i, j, k;
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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_new(char, num_processors);
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histogram->tmp_values = g_new(double **, num_processors);
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for (i = 0; i < num_processors; i++)
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{
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histogram->tmp_values[i] = g_new(double *, histogram->nchannels);
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histogram->tmp_slots[i] = 0;
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for (j = 0; j < histogram->nchannels; j++)
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{
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histogram->tmp_values[i][j] = g_new(double, 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->nchannels; 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 < num_processors; i++)
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{
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for (j = 0; j < histogram->nchannels; 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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void
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gimp_histogram_calculate_drawable(GimpHistogram *histogram,
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GimpDrawable *drawable)
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{
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PixelRegion region;
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PixelRegion mask;
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int x1, y1, x2, y2;
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int off_x, off_y;
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int no_mask;
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no_mask = (drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2) == FALSE);
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pixel_region_init (®ion, gimp_drawable_data (drawable), x1, y1,
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(x2 - x1), (y2 - y1), FALSE);
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if (!no_mask)
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{
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Channel *sel_mask;
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GimpImage *gimage;
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gimage = gimp_drawable_gimage(drawable);
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sel_mask = gimp_image_get_mask (gimage);
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drawable_offsets (drawable, &off_x, &off_y);
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pixel_region_init (&mask, gimp_drawable_data (GIMP_DRAWABLE (sel_mask)),
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x1 + off_x, y1 + off_y, (x2 - x1), (y2 - y1), FALSE);
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gimp_histogram_calculate (histogram, ®ion, &mask);
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}
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else
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gimp_histogram_calculate (histogram, ®ion, NULL);
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}
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double
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gimp_histogram_get_maximum (GimpHistogram *histogram, int channel)
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{
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double max = 0.0;
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int 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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double
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gimp_histogram_get_value (GimpHistogram *histogram, int channel, int bin)
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{
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if (channel < histogram->nchannels && 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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double
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gimp_histogram_get_channel (GimpHistogram *histogram, int channel, int bin)
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{
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if (histogram->nchannels > 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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int
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gimp_histogram_nchannels (GimpHistogram *histogram)
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{
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return histogram->nchannels - 1;
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}
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double
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gimp_histogram_get_count (GimpHistogram *histogram, int start, int end)
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{
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int i;
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double 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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double
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gimp_histogram_get_mean (GimpHistogram *histogram, int channel,
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int start, int end)
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{
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int i;
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double mean = 0.0;
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double 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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int
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gimp_histogram_get_median (GimpHistogram *histogram, int channel, int start, int end)
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{
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int i;
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double sum = 0.0;
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double 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 += i * 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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double
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gimp_histogram_get_std_dev (GimpHistogram *histogram, int channel,
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int start, int end)
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{
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int i;
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double dev = 0.0;
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double count;
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double 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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