mirror of https://github.com/GNOME/gimp.git
426 lines
9.8 KiB
C
426 lines
9.8 KiB
C
/* 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 "gimphistogramP.h"
|
|
#include "gimphistogram.h"
|
|
#include "pixel_region.h"
|
|
#include "gimpdrawable.h"
|
|
#include "channel.h"
|
|
#include "gimpimage.h"
|
|
#include "gimprc.h"
|
|
#include <glib.h>
|
|
#include <math.h>
|
|
|
|
#ifdef ENABLE_MP
|
|
|
|
#include <pthread.h>
|
|
|
|
#endif /* ENABLE_MP */
|
|
|
|
|
|
GimpHistogram *
|
|
gimp_histogram_new (void)
|
|
{
|
|
GimpHistogram *histogram;
|
|
histogram = g_new (GimpHistogram, 1);
|
|
histogram->values = NULL;
|
|
histogram->nchannels = 0;
|
|
return histogram;
|
|
}
|
|
|
|
void
|
|
gimp_histogram_free (GimpHistogram *histogram)
|
|
{
|
|
int i;
|
|
if (histogram->values)
|
|
{
|
|
for (i = 0; i < histogram->nchannels; i++)
|
|
g_free (histogram->values[i]);
|
|
g_free (histogram->values);
|
|
}
|
|
g_free (histogram);
|
|
}
|
|
|
|
void
|
|
gimp_histogram_calculate_sub_region (GimpHistogram *histogram,
|
|
PixelRegion *region,
|
|
PixelRegion *mask)
|
|
{
|
|
const unsigned char *src, *msrc;
|
|
const unsigned char *m, *s;
|
|
double **values;
|
|
int h, w, max;
|
|
#ifdef ENABLE_MP
|
|
int slot = 0;
|
|
/* find an unused temporary slot to put our results in and lock it */
|
|
pthread_mutex_lock (&histogram->mutex);
|
|
{
|
|
while (histogram->tmp_slots[slot])
|
|
slot++;
|
|
values = histogram->tmp_values[slot];
|
|
histogram->tmp_slots[slot] = 1;
|
|
}
|
|
pthread_mutex_unlock (&histogram->mutex);
|
|
#else /* !ENABLE_MP */
|
|
values = histogram->values;
|
|
#endif
|
|
h = region->h;
|
|
w = region->w;
|
|
if (mask)
|
|
{
|
|
double masked;
|
|
src = region->data;
|
|
msrc = region->data;
|
|
while (h--)
|
|
{
|
|
s = src;
|
|
m = msrc;
|
|
w = region->w;
|
|
switch(region->bytes)
|
|
{
|
|
case 1:
|
|
while (w--)
|
|
{
|
|
masked = m[0] / 255.0;
|
|
values[0][s[0]] += masked;
|
|
s += 1;
|
|
m += 1;
|
|
} break;
|
|
case 2:
|
|
while (w--)
|
|
{
|
|
masked = m[0] / 255.0;
|
|
values[0][s[0]] += masked;
|
|
values[1][s[1]] += masked;
|
|
s += 2;
|
|
m += 1;
|
|
} break;
|
|
case 3: /* calculate seperate value values */
|
|
while (w--)
|
|
{
|
|
masked = m[0] / 255.0;
|
|
values[1][s[0]] += masked;
|
|
values[2][s[1]] += masked;
|
|
values[3][s[2]] += masked;
|
|
max = (s[0] > s[1]) ? s[0] : s[1];
|
|
if (s[2] > max)
|
|
values[0][s[2]] += masked;
|
|
else
|
|
values[0][max] += masked;
|
|
s += 3;
|
|
m += 1;
|
|
} break;
|
|
case 4: /* calculate seperate value values */
|
|
while (w--)
|
|
{
|
|
masked = m[0] / 255.0;
|
|
values[1][s[0]] += masked;
|
|
values[2][s[1]] += masked;
|
|
values[3][s[2]] += masked;
|
|
values[4][s[3]] += masked;
|
|
max = (s[0] > s[1]) ? s[0] : s[1];
|
|
if (s[2] > max)
|
|
values[0][s[2]] += masked;
|
|
else
|
|
values[0][max] += masked;
|
|
s += 3;
|
|
m += 1;
|
|
} break;
|
|
}
|
|
src += region->rowstride;
|
|
msrc += mask->rowstride;
|
|
}
|
|
}
|
|
else /* no mask */
|
|
{
|
|
src = region->data;
|
|
while (h--)
|
|
{
|
|
s = src;
|
|
w = region->w;
|
|
switch(region->bytes)
|
|
{
|
|
case 1:
|
|
while (w--)
|
|
{
|
|
values[0][s[0]] += 1.0;
|
|
s += 1;
|
|
} break;
|
|
case 2:
|
|
while (w--)
|
|
{
|
|
values[0][s[0]] += 1.0;
|
|
values[1][s[1]] += 1.0;
|
|
s += 2;
|
|
} break;
|
|
case 3: /* calculate seperate value values */
|
|
while (w--)
|
|
{
|
|
values[1][s[0]] += 1.0;
|
|
values[2][s[1]] += 1.0;
|
|
values[3][s[2]] += 1.0;
|
|
max = (s[0] > s[1]) ? s[0] : s[1];
|
|
if (s[2] > max)
|
|
values[0][s[2]] += 1.0;
|
|
else
|
|
values[0][max] += 1.0;
|
|
s += 3;
|
|
} break;
|
|
case 4: /* calculate seperate value values */
|
|
while (w--)
|
|
{
|
|
values[1][s[0]] += 1.0;
|
|
values[2][s[1]] += 1.0;
|
|
values[3][s[2]] += 1.0;
|
|
values[4][s[3]] += 1.0;
|
|
max = (s[0] > s[1]) ? s[0] : s[1];
|
|
if (s[2] > max)
|
|
values[0][s[2]] += 1.0;
|
|
else
|
|
values[0][max] += 1.0;
|
|
s += 3;
|
|
} break;
|
|
}
|
|
src += region->rowstride;
|
|
}
|
|
}
|
|
|
|
#ifdef ENABLE_MP
|
|
/* unlock this slot */
|
|
/* we shouldn't have to use mutex locks here */
|
|
pthread_mutex_lock (&histogram->mutex);
|
|
histogram->tmp_slots[slot] = 0;
|
|
pthread_mutex_unlock (&histogram->mutex);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
gimp_histogram_alloc (GimpHistogram *histogram,
|
|
int bytes)
|
|
{
|
|
int i;
|
|
if (bytes + 1 != histogram->nchannels)
|
|
{
|
|
if (histogram->values)
|
|
{
|
|
for (i = 0; i < histogram->nchannels; i++)
|
|
g_free (histogram->values[i]);
|
|
g_free (histogram->values);
|
|
}
|
|
histogram->nchannels = bytes + 1;
|
|
histogram->values = g_new (double *, histogram->nchannels);
|
|
for (i = 0; i < histogram->nchannels; i++)
|
|
histogram->values[i] = g_new (double, 256);
|
|
}
|
|
}
|
|
|
|
void
|
|
gimp_histogram_calculate (GimpHistogram *histogram,
|
|
PixelRegion *region,
|
|
PixelRegion *mask)
|
|
{
|
|
int i, j;
|
|
#ifdef ENABLE_MP
|
|
int k;
|
|
#endif
|
|
|
|
gimp_histogram_alloc (histogram, region->bytes);
|
|
|
|
#ifdef ENABLE_MP
|
|
pthread_mutex_init (&histogram->mutex, NULL);
|
|
histogram->tmp_slots = g_new (char, num_processors);
|
|
histogram->tmp_values = g_new (double **, num_processors);
|
|
for (i = 0; i < num_processors; i++)
|
|
{
|
|
histogram->tmp_values[i] = g_new (double *, histogram->nchannels);
|
|
histogram->tmp_slots[i] = 0;
|
|
for (j = 0; j < histogram->nchannels; j++)
|
|
{
|
|
histogram->tmp_values[i][j] = g_new (double, 256);
|
|
for (k = 0; k < 256; k++)
|
|
histogram->tmp_values[i][j][k] = 0.0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
for (i = 0; i < histogram->nchannels; i++)
|
|
for (j = 0; j < 256; j++)
|
|
histogram->values[i][j] = 0.0;
|
|
|
|
pixel_regions_process_parallel ((p_func)gimp_histogram_calculate_sub_region,
|
|
histogram, 2, region, mask);
|
|
|
|
#ifdef ENABLE_MP
|
|
/* add up all the tmp buffers and free their memmory */
|
|
for (i = 0; i < num_processors; i++)
|
|
{
|
|
for (j = 0; j < histogram->nchannels; j++)
|
|
{
|
|
for (k = 0; k < 256; k++)
|
|
histogram->values[j][k] += histogram->tmp_values[i][j][k];
|
|
g_free (histogram->tmp_values[i][j]);
|
|
}
|
|
g_free (histogram->tmp_values[i]);
|
|
}
|
|
g_free (histogram->tmp_values);
|
|
g_free (histogram->tmp_slots);
|
|
#endif
|
|
}
|
|
|
|
|
|
void
|
|
gimp_histogram_calculate_drawable (GimpHistogram *histogram,
|
|
GimpDrawable *drawable)
|
|
{
|
|
PixelRegion region;
|
|
PixelRegion mask;
|
|
int x1, y1, x2, y2;
|
|
int off_x, off_y;
|
|
int no_mask;
|
|
|
|
no_mask = (drawable_mask_bounds (drawable, &x1, &y1, &x2, &y2) == FALSE);
|
|
pixel_region_init (®ion, gimp_drawable_data (drawable), x1, y1,
|
|
(x2 - x1), (y2 - y1), FALSE);
|
|
if (!no_mask)
|
|
{
|
|
Channel *sel_mask;
|
|
GimpImage *gimage;
|
|
|
|
gimage = gimp_drawable_gimage(drawable);
|
|
sel_mask = gimp_image_get_mask (gimage);
|
|
|
|
drawable_offsets (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);
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_maximum (GimpHistogram *histogram,
|
|
int channel)
|
|
{
|
|
double max = 0.0;
|
|
int x;
|
|
for (x = 0; x < 256; x++)
|
|
if (histogram->values[channel][x] > max)
|
|
max = histogram->values[channel][x];
|
|
return max;
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_value (GimpHistogram *histogram,
|
|
int channel,
|
|
int bin)
|
|
{
|
|
if (channel < histogram->nchannels && bin >= 0 && bin < 256)
|
|
return histogram->values[channel][bin];
|
|
return 0.0;
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_channel (GimpHistogram *histogram,
|
|
int channel,
|
|
int bin)
|
|
{
|
|
if (histogram->nchannels > 3)
|
|
return gimp_histogram_get_value (histogram, channel + 1, bin);
|
|
else
|
|
return gimp_histogram_get_value (histogram, channel , bin);
|
|
}
|
|
|
|
int
|
|
gimp_histogram_nchannels (GimpHistogram *histogram)
|
|
{
|
|
return histogram->nchannels - 1;
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_count (GimpHistogram *histogram,
|
|
int start,
|
|
int end)
|
|
{
|
|
int i;
|
|
double count = 0.0;
|
|
for (i = start; i <= end; i++)
|
|
count += histogram->values[0][i];
|
|
return count;
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_mean (GimpHistogram *histogram,
|
|
int channel,
|
|
int start,
|
|
int end)
|
|
{
|
|
int i;
|
|
double mean = 0.0;
|
|
double count;
|
|
for (i = start; i <= end; i++)
|
|
mean += i * histogram->values[channel][i];
|
|
count = gimp_histogram_get_count (histogram, start, end);
|
|
if (count > 0.0)
|
|
return mean / count;
|
|
return mean;
|
|
}
|
|
|
|
int
|
|
gimp_histogram_get_median (GimpHistogram *histogram,
|
|
int channel,
|
|
int start,
|
|
int end)
|
|
{
|
|
int i;
|
|
double sum = 0.0;
|
|
double count;
|
|
count = gimp_histogram_get_count (histogram, start, end);
|
|
for (i = start; i <= end; i++)
|
|
{
|
|
sum += i * histogram->values[channel][i];
|
|
if (sum * 2 > count)
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
double
|
|
gimp_histogram_get_std_dev (GimpHistogram *histogram,
|
|
int channel,
|
|
int start,
|
|
int end)
|
|
{
|
|
int i;
|
|
double dev = 0.0;
|
|
double count;
|
|
double mean;
|
|
mean = gimp_histogram_get_mean(histogram, channel, start, end);
|
|
count = gimp_histogram_get_count(histogram, start, end);
|
|
if (count == 0.0)
|
|
count = 1.0;
|
|
for (i = start; i <= end; i++)
|
|
dev += gimp_histogram_get_value (histogram, channel, i) *
|
|
(i - mean) * (i - mean);
|
|
return sqrt (dev / count);
|
|
}
|