+++ /dev/null
-/*
- * Geeqie
- * Copyright (C) 2008 The Geeqie Team
- *
- * Author: Vladimir Nadvornik
- * based on a patch by Uwe Ohse
- *
- * This software is released under the GNU General Public License (GNU GPL).
- * Please read the included file COPYING for more information.
- * This software comes with no warranty of any kind, use at your own risk!
- */
-
-#include "main.h"
-#include "histogram.h"
-
-#include "pixbuf_util.h"
-
-#include <math.h>
-
-/*
- *----------------------------------------------------------------------------
- * image histogram
- *----------------------------------------------------------------------------
- */
-
-#define HISTOGRAM_SIZE 256
-
-struct _Histogram {
- gulong histmap[HISTOGRAM_SIZE*4];
- gint histogram_chan;
- gint histogram_logmode;
-};
-
-
-Histogram *histogram_new()
-{
- Histogram *histogram;
-
- histogram = g_new0(Histogram, 1);
- histogram->histogram_chan = HCHAN_RGB;
- histogram->histogram_logmode = 1;
-
- return histogram;
-}
-
-void histogram_free(Histogram *histogram)
-{
- g_free(histogram);
-}
-
-
-gint histogram_set_channel(Histogram *histogram, gint chan)
-{
- if (!histogram) return 0;
- histogram->histogram_chan = chan;
- return chan;
-}
-
-gint histogram_get_channel(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram->histogram_chan;
-}
-
-gint histogram_set_mode(Histogram *histogram, gint mode)
-{
- if (!histogram) return 0;
- histogram->histogram_logmode = mode;
- return mode;
-}
-
-gint histogram_get_mode(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram->histogram_logmode;
-}
-
-const gchar *histogram_label(Histogram *histogram)
-{
- const gchar *t1 = "";
- if (!histogram) return NULL;
-
- if (histogram->histogram_logmode)
- switch (histogram->histogram_chan)
- {
- case HCHAN_R: t1 = _("logarithmical histogram on red"); break;
- case HCHAN_G: t1 = _("logarithmical histogram on green"); break;
- case HCHAN_B: t1 = _("logarithmical histogram on blue"); break;
- case HCHAN_VAL: t1 = _("logarithmical histogram on value"); break;
- case HCHAN_RGB: t1 = _("logarithmical histogram on RGB"); break;
- case HCHAN_MAX: t1 = _("logarithmical histogram on max value"); break;
- }
- else
- switch (histogram->histogram_chan)
- {
- case HCHAN_R: t1 = _("linear histogram on red"); break;
- case HCHAN_G: t1 = _("linear histogram on green"); break;
- case HCHAN_B: t1 = _("linear histogram on blue"); break;
- case HCHAN_VAL: t1 = _("linear histogram on value"); break;
- case HCHAN_RGB: t1 = _("linear histogram on RGB"); break;
- case HCHAN_MAX: t1 = _("linear histogram on max value"); break;
- }
- return t1;
-}
-
-gulong histogram_read(Histogram *histogram, GdkPixbuf *imgpixbuf)
-{
- gint w, h, i, j, srs, has_alpha, step;
- guchar *s_pix;
-
- if (!histogram) return 0;
-
- w = gdk_pixbuf_get_width(imgpixbuf);
- h = gdk_pixbuf_get_height(imgpixbuf);
- srs = gdk_pixbuf_get_rowstride(imgpixbuf);
- s_pix = gdk_pixbuf_get_pixels(imgpixbuf);
- has_alpha = gdk_pixbuf_get_has_alpha(imgpixbuf);
-
- memset(histogram->histmap, 0, sizeof(histogram->histmap));
-
- /* code duplication is here to speed up the calculation */
- step = 3 + !!(has_alpha);
- if (histogram->histogram_chan == HCHAN_MAX)
- {
- for (i = 0; i < h; i++)
- {
- guchar *sp = s_pix + (i * srs); /* 8bit */
- for (j = 0; j < w; j++)
- {
- guchar t = sp[0];
- if (sp[1]>t) t = sp[1];
- if (sp[2]>t) t = sp[2];
-
- histogram->histmap[sp[0] + 0 * HISTOGRAM_SIZE]++;
- histogram->histmap[sp[1] + 1 * HISTOGRAM_SIZE]++;
- histogram->histmap[sp[2] + 2 * HISTOGRAM_SIZE]++;
- histogram->histmap[t + 3 * HISTOGRAM_SIZE]++;
- sp += step;
- }
- }
- }
- else
- {
- for (i = 0; i < h; i++)
- {
- guchar *sp = s_pix + (i * srs); /* 8bit */
- for (j = 0; j < w; j++)
- {
- histogram->histmap[sp[0] + 0 * HISTOGRAM_SIZE]++;
- histogram->histmap[sp[1] + 1 * HISTOGRAM_SIZE]++;
- histogram->histmap[sp[2] + 2 * HISTOGRAM_SIZE]++;
- histogram->histmap[3 * HISTOGRAM_SIZE + (sp[0]+sp[1]+sp[2])/3]++;
- sp += step;
- }
- }
- }
-
- return w*h;
-}
-
-gint histogram_draw(Histogram *histogram, GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height)
-{
- /* FIXME: use the coordinates correctly */
- gint i;
- gulong max = 0;
- double logmax;
-
- if (!histogram) return 0;
-
- for (i = 0; i < 1024; i++) {
- gint flag = 0;
-
- switch (histogram->histogram_chan)
- {
- case HCHAN_RGB: if ((i%4) != 3) flag = 1; break;
- case HCHAN_R: if ((i%4) == 0) flag = 1; break;
- case HCHAN_G: if ((i%4) == 1) flag = 1; break;
- case HCHAN_B: if ((i%4) == 2) flag = 1; break;
- case HCHAN_VAL: if ((i%4) == 3) flag = 1; break;
- case HCHAN_MAX: if ((i%4) == 3) flag = 1; break;
- }
- if (flag && histogram->histmap[i] > max) max = histogram->histmap[i];
- }
-
- logmax = log(max);
- for (i = 0; i < width; i++)
- {
- gint j;
- glong v[4] = {0, 0, 0, 0};
- gint rplus = 0;
- gint gplus = 0;
- gint bplus = 0;
- gint ii = i * HISTOGRAM_SIZE / width;
- gint combine = (HISTOGRAM_SIZE - 1) / width + 1;
-
- for (j = 0; j < combine; j++)
- {
- v[0] += histogram->histmap[ii + j + 0 * HISTOGRAM_SIZE]; // r
- v[1] += histogram->histmap[ii + j + 1 * HISTOGRAM_SIZE]; // g
- v[2] += histogram->histmap[ii + j + 2 * HISTOGRAM_SIZE]; // b
- v[3] += histogram->histmap[ii + j + 3 * HISTOGRAM_SIZE]; // value, max
- }
-
- for (j = 0; j < 4; j++)
- {
- gint max2 = 0;
- gint k;
-
- for (k = 1; k < 4; k++)
- if (v[k] > v[max2]) max2 = k;
-
- if (histogram->histogram_chan >= HCHAN_RGB
- || max2 == histogram->histogram_chan)
- {
- gulong pt;
- gint r = rplus;
- gint g = gplus;
- gint b = bplus;
-
- switch (max2)
- {
- case HCHAN_R: rplus = r = 255; break;
- case HCHAN_G: gplus = g = 255; break;
- case HCHAN_B: bplus = b = 255; break;
- }
-
- switch (histogram->histogram_chan)
- {
- case HCHAN_RGB:
- if (r == 255 && g == 255 && b == 255)
- {
- r = 0; b = 0; g = 0;
- }
- break;
- case HCHAN_R: b = 0; g = 0; break;
- case HCHAN_G: r = 0; b = 0; break;
- case HCHAN_B: r = 0; g = 0; break;
- case HCHAN_MAX:
- case HCHAN_VAL: r = 0; b = 0; g = 0; break;
- }
-
- if (v[max2] == 0)
- pt = 0;
- else if (histogram->histogram_logmode)
- pt = ((float)log(v[max2])) / logmax * (height - 1);
- else
- pt = ((float)v[max2])/ max * (height - 1);
-
- pixbuf_draw_line(pixbuf,
- x, y, width, height,
- x + i, y + height, x + i, y + height - pt,
- r, g, b, 255);
- }
- v[max2] = -1;
- }
- }
-
- return TRUE;
-}
projects / geeqie.git / blobdiff