+++ /dev/null
-/*
- * Geeqie
- * Copyright (C) 2008 - 2009 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 HISTMAP_SIZE 256
-
-struct _HistMap {
- gulong r[HISTMAP_SIZE];
- gulong g[HISTMAP_SIZE];
- gulong b[HISTMAP_SIZE];
- gulong max[HISTMAP_SIZE];
-};
-
-struct _Histogram {
- gint channel_mode; /* drawing mode for histogram */
- gint log_mode; /* logarithmical or not */
- guint vgrid; /* number of vertical divisions, 0 for none */
- guint hgrid; /* number of horizontal divisions, 0 for none */
- struct {
- int R; /* red */
- int G; /* green */
- int B; /* blue */
- int A; /* alpha */
- } grid_color; /* grid color */
-
-};
-
-Histogram *histogram_new(void)
-{
- Histogram *histogram;
-
- histogram = g_new0(Histogram, 1);
- histogram->channel_mode = options->histogram.last_channel_mode;
- histogram->log_mode = options->histogram.last_log_mode;
-
- /* grid */
- histogram->vgrid = 5;
- histogram->hgrid = 3;
- histogram->grid_color.R = 160;
- histogram->grid_color.G = 160;
- histogram->grid_color.B = 160;
- histogram->grid_color.A = 250;
-
- return histogram;
-}
-
-void histogram_free(Histogram *histogram)
-{
- g_free(histogram);
-}
-
-
-gint histogram_set_channel(Histogram *histogram, gint chan)
-{
- if (!histogram) return 0;
- options->histogram.last_channel_mode = histogram->channel_mode = chan;
- return chan;
-}
-
-gint histogram_get_channel(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram->channel_mode;
-}
-
-gint histogram_set_mode(Histogram *histogram, gint mode)
-{
- if (!histogram) return 0;
- options->histogram.last_log_mode = histogram->log_mode = mode;
- return mode;
-}
-
-gint histogram_get_mode(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram->log_mode;
-}
-
-gint histogram_toggle_channel(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram_set_channel(histogram, (histogram_get_channel(histogram)+1)%HCHAN_COUNT);
-}
-
-gint histogram_toggle_mode(Histogram *histogram)
-{
- if (!histogram) return 0;
- return histogram_set_mode(histogram, !histogram_get_mode(histogram));
-}
-
-const gchar *histogram_label(Histogram *histogram)
-{
- const gchar *t1 = "";
-
- if (!histogram) return NULL;
-
- if (histogram->log_mode)
- switch (histogram->channel_mode)
- {
- 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_RGB: t1 = _("logarithmical histogram on RGB"); break;
- case HCHAN_MAX: t1 = _("logarithmical histogram on max value"); break;
- }
- else
- switch (histogram->channel_mode)
- {
- 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_RGB: t1 = _("linear histogram on RGB"); break;
- case HCHAN_MAX: t1 = _("linear histogram on max value"); break;
- }
- return t1;
-}
-
-static HistMap *histmap_read(GdkPixbuf *imgpixbuf)
-{
- gint w, h, i, j, srs, has_alpha, step;
- guchar *s_pix;
- HistMap *histmap;
-
- 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);
-
- histmap = g_new0(HistMap, 1);
-
- step = 3 + !!(has_alpha);
- for (i = 0; i < h; i++)
- {
- guchar *sp = s_pix + (i * srs); /* 8bit */
- for (j = 0; j < w; j++)
- {
- guint max = sp[0];
- if (sp[1] > max) max = sp[1];
- if (sp[2] > max) max = sp[2];
-
- histmap->r[sp[0]]++;
- histmap->g[sp[1]]++;
- histmap->b[sp[2]]++;
- histmap->max[max]++;
-
- sp += step;
- }
- }
-
- return histmap;
-}
-
-const HistMap *histmap_get(FileData *fd)
-{
- if (fd->histmap) return fd->histmap;
-
- if (fd->pixbuf)
- {
- fd->histmap = histmap_read(fd->pixbuf);
- return fd->histmap;
- }
- return NULL;
-}
-
-static void histogram_vgrid(Histogram *histogram, GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height)
-{
- guint i;
- float add;
-
- if (histogram->vgrid == 0) return;
-
- add = width / (float)histogram->vgrid;
-
- for (i = 1; i < histogram->vgrid; i++)
- {
- gint xpos = x + (int)(i * add + 0.5);
-
- pixbuf_draw_line(pixbuf, x, y, width, height, xpos, y, xpos, y + height,
- histogram->grid_color.R,
- histogram->grid_color.G,
- histogram->grid_color.B,
- histogram->grid_color.A);
- }
-}
-
-static void histogram_hgrid(Histogram *histogram, GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height)
-{
- guint i;
- float add;
-
- if (histogram->hgrid == 0) return;
-
- add = height / (float)histogram->hgrid;
-
- for (i = 1; i < histogram->hgrid; i++)
- {
- gint ypos = y + (int)(i * add + 0.5);
-
- pixbuf_draw_line(pixbuf, x, y, width, height, x, ypos, x + width, ypos,
- histogram->grid_color.R,
- histogram->grid_color.G,
- histogram->grid_color.B,
- histogram->grid_color.A);
- }
-}
-
-gint histogram_draw(Histogram *histogram, const HistMap *histmap, GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height)
-{
- /* FIXME: use the coordinates correctly */
- gint i;
- gulong max = 0;
- gdouble logmax;
- gint combine = (HISTMAP_SIZE - 1) / width + 1;
- gint ypos = y + height;
-
- if (!histogram || !histmap) return 0;
-
- /* Draw the grid */
- histogram_vgrid(histogram, pixbuf, x, y, width, height);
- histogram_hgrid(histogram, pixbuf, x, y, width, height);
-
- for (i = 0; i < HISTMAP_SIZE; i++)
- {
- if (histmap->r[i] > max) max = histmap->r[i];
- if (histmap->g[i] > max) max = histmap->g[i];
- if (histmap->b[i] > max) max = histmap->b[i];
- }
-
- if (max > 0)
- logmax = log(max);
- else
- logmax = 1.0;
-
- 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 * HISTMAP_SIZE / width;
- gint xpos = x + i;
-
- for (j = 0; j < combine; j++)
- {
- guint p = ii + j;
- v[0] += histmap->r[p];
- v[1] += histmap->g[p];
- v[2] += histmap->b[p];
- v[3] += histmap->max[p];
- }
-
- for (j = 0; combine > 1 && j < 4; j++)
- v[j] /= combine;
-
- for (j = 0; j < 4; j++)
- {
- gint k;
- gint chanmax = 0;
-
- for (k = 1; k < 3; k++)
- if (v[k] > v[chanmax])
- chanmax = k;
-
- if (histogram->channel_mode >= HCHAN_RGB
- || chanmax == histogram->channel_mode)
- {
- gulong pt;
- gint r = rplus;
- gint g = gplus;
- gint b = bplus;
-
- switch (chanmax)
- {
- case 0: rplus = r = 255; break;
- case 1: gplus = g = 255; break;
- case 2: bplus = b = 255; break;
- }
-
- switch (histogram->channel_mode)
- {
- 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: r = 0; b = 0; g = 0; break;
- }
-
- if (v[chanmax] == 0)
- pt = 0;
- else if (histogram->log_mode)
- pt = ((gdouble)log(v[chanmax])) / logmax * (height - 1);
- else
- pt = ((gdouble)v[chanmax]) / max * (height - 1);
-
- pixbuf_draw_line(pixbuf,
- x, y, width, height,
- xpos, ypos, xpos, ypos - pt,
- r, g, b, 255);
- }
-
- v[chanmax] = -1;
- }
- }
-
- return TRUE;
-}
-
-void histogram_notify_cb(FileData *fd, NotifyType type, gpointer data)
-{
- if (type != NOTIFY_TYPE_INTERNAL && fd->histmap)
- {
- g_free(fd->histmap);
- fd->histmap = NULL;
- }
-}
-
-/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */
projects / geeqie.git / blobdiff