+++ /dev/null
-/*
- * Geeqie
- *
- * 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
- *----------------------------------------------------------------------------
- */
-
-
-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;
- 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);
-
- for (i = 0; i < 256*4; i++) histogram->histmap[i] = 0;
-
- 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->histmap[sp[1]+256]++;
- histogram->histmap[sp[2]+512]++;
- if (histogram->histogram_chan == HCHAN_MAX)
- {
- guchar t = sp[0];
- if (sp[1]>t) t = sp[1];
- if (sp[2]>t) t = sp[2];
- histogram->histmap[t+768]++;
- }
- else
- histogram->histmap[768+(sp[0]+sp[1]+sp[2])/3]++;
- sp += 3;
- if (has_alpha) sp++;
- }
- }
-
- 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<256; i++)
- {
- gint j;
- glong v[4];
- gint rplus = 0;
- gint gplus = 0;
- gint bplus = 0;
-
- v[0] = histogram->histmap[i+0*256]; // r
- v[1] = histogram->histmap[i+1*256]; // g
- v[2] = histogram->histmap[i+2*256]; // b
- v[3] = histogram->histmap[i+3*256]; // value, max
-
- for (j=0; j<4; j++)
- {
- gint r = rplus;
- gint g = gplus;
- gint b = bplus;
- gint max2 = 0;
- gint k;
- gulong pt;
-
- for (k=1; k<4; k++)
- if (v[k] > v[max2]) max2 = k;
-
- 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_MAX: r = 0; b = 0; g = 0; break;
- case HCHAN_VAL: r = 0; b = 0; g = 0; break;
- case HCHAN_R: g = 0; b = 0; break;
- case HCHAN_G: r = 0; b = 0; break;
- case HCHAN_B: r = 0; g = 0; break;
- case HCHAN_RGB:
- if (r == 255 && g == 255 && b == 255) {
- r = 0;
- g = 0;
- b = 0;
- }
- break;
- }
-
- if (v[max2] == 0)
- pt = 0;
- else if (histogram->histogram_logmode)
- pt = ((float)log(v[max2]))/logmax*255;
- else
- pt = ((float)v[max2])/max*255;
- if (histogram->histogram_chan >= HCHAN_RGB
- || max2 == histogram->histogram_chan)
- pixbuf_draw_line(pixbuf,
- 0+5, height-255, 256, 256,
- i+5, height, i+5, height-pt,
- r, g, b, 255);
- v[max2] = -1;
- }
- }
- return TRUE;
-}
projects / geeqie.git / blobdiff