/*
* Geeqie
+ * Copyright (C) 2008 - 2012 The Geeqie Team
*
* Author: Vladimir Nadvornik
* based on a patch by Uwe Ohse
#include "histogram.h"
#include "pixbuf_util.h"
+#include "filedata.h"
#include <math.h>
*----------------------------------------------------------------------------
*/
-#define HISTOGRAM_SIZE 256
-
-struct _Histogram {
- gulong histmap[HISTOGRAM_SIZE*4];
- gint histogram_chan;
- gint histogram_logmode;
+#define HISTMAP_SIZE 256
+
+struct _HistMap {
+ gulong r[HISTMAP_SIZE];
+ gulong g[HISTMAP_SIZE];
+ gulong b[HISTMAP_SIZE];
+ gulong max[HISTMAP_SIZE];
+
+ guint idle_id; /* event source id */
+ GdkPixbuf *pixbuf;
+ gint y;
};
-Histogram *histogram_new()
+Histogram *histogram_new(void)
{
Histogram *histogram;
- histogram = g_new0(Histogram, 1);
- histogram->histogram_chan = HCHAN_RGB;
- histogram->histogram_logmode = 1;
+ histogram = g_new0(Histogram, 1);
+ histogram->histogram_channel = HCHAN_DEFAULT;
+ histogram->histogram_mode = 0;
+
+ /* 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;
}
gint histogram_set_channel(Histogram *histogram, gint chan)
{
if (!histogram) return 0;
- histogram->histogram_chan = chan;
+ histogram->histogram_channel = chan;
return chan;
}
gint histogram_get_channel(Histogram *histogram)
{
if (!histogram) return 0;
- return histogram->histogram_chan;
+ return histogram->histogram_channel;
}
gint histogram_set_mode(Histogram *histogram, gint mode)
{
if (!histogram) return 0;
- histogram->histogram_logmode = mode;
+ histogram->histogram_mode = mode;
return mode;
}
gint histogram_get_mode(Histogram *histogram)
{
if (!histogram) return 0;
- return histogram->histogram_logmode;
+ return histogram->histogram_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->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;
- }
+ if (histogram->histogram_mode)
+ switch (histogram->histogram_channel)
+ {
+ case HCHAN_R: t1 = _("Log Histogram on Red"); break;
+ case HCHAN_G: t1 = _("Log Histogram on Green"); break;
+ case HCHAN_B: t1 = _("Log Histogram on Blue"); break;
+ case HCHAN_RGB: t1 = _("Log Histogram on RGB"); break;
+ case HCHAN_MAX: t1 = _("Log Histogram on value"); break;
+ }
+ else
+ switch (histogram->histogram_channel)
+ {
+ 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 value"); break;
+ }
return t1;
}
-gulong histogram_read(Histogram *histogram, GdkPixbuf *imgpixbuf)
+static HistMap *histmap_new(void)
{
- gint w, h, i, j, srs, has_alpha;
- guchar *s_pix;
+ HistMap *histmap = g_new0(HistMap, 1);
+ return histmap;
+}
- if (!histogram) return 0;
+void histmap_free(HistMap *histmap)
+{
+ if (!histmap) return;
+ if (histmap->idle_id) g_source_remove(histmap->idle_id);
+ if (histmap->pixbuf) g_object_unref(histmap->pixbuf);
+ g_free(histmap);
+}
+static gboolean histmap_read(HistMap *histmap, gboolean whole)
+{
+ gint w, h, i, j, srs, has_alpha, step, end_line;
+ guchar *s_pix;
+ GdkPixbuf *imgpixbuf = histmap->pixbuf;
+
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);
+
+ if (whole)
+ {
+ end_line = h;
+ }
+ else
+ {
+ gint lines = 1 + 16384 / w;
+ end_line = histmap->y + lines;
+ if (end_line > h) end_line = h;
+ }
- for (i = 0; i < HISTOGRAM_SIZE*4; i++) histogram->histmap[i] = 0;
-
- for (i = 0; i < h; i++)
+ step = 3 + !!(has_alpha);
+ for (i = histmap->y; i < end_line; 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]++;
- 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 + 3 * HISTOGRAM_SIZE]++;
- }
- else
- histogram->histmap[3 * HISTOGRAM_SIZE + (sp[0]+sp[1]+sp[2])/3]++;
- sp += 3;
- if (has_alpha) sp++;
+ 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;
}
}
+ histmap->y = end_line;
+ return end_line >= h;
+}
+
+const HistMap *histmap_get(FileData *fd)
+{
+ if (fd->histmap && !fd->histmap->idle_id) return fd->histmap; /* histmap exists and is finished */
+
+ return NULL;
+}
+
+static gboolean histmap_idle_cb(gpointer data)
+{
+ FileData *fd = data;
+ if (histmap_read(fd->histmap, FALSE))
+ {
+ /* finished */
+ g_object_unref(fd->histmap->pixbuf); /*pixbuf is no longer needed */
+ fd->histmap->pixbuf = NULL;
+ fd->histmap->idle_id = 0;
+ file_data_send_notification(fd, NOTIFY_HISTMAP);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+gboolean histmap_start_idle(FileData *fd)
+{
+ if (fd->histmap || !fd->pixbuf) return FALSE;
+
+ fd->histmap = histmap_new();
+ fd->histmap->pixbuf = fd->pixbuf;
+ g_object_ref(fd->histmap->pixbuf);
+
+ fd->histmap->idle_id = g_idle_add_full(G_PRIORITY_DEFAULT_IDLE, histmap_idle_cb, fd, NULL);
+ return TRUE;
+}
+
+
+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);
- return w*h;
+ 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, GdkPixbuf *pixbuf, gint x, gint y, gint width, gint height)
+gboolean 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;
- double logmax;
-
- if (!histogram) return 0;
-
- for (i=0; i<1024; i++) {
- gint flag = 0;
+ gdouble logmax;
+ gint combine = (HISTMAP_SIZE - 1) / width + 1;
+ gint ypos = y + height;
+
+ if (!histogram || !histmap) return FALSE;
+
+ /* Draw the grid */
+ histogram_vgrid(histogram, pixbuf, x, y, width, height);
+ histogram_hgrid(histogram, pixbuf, x, y, width, height);
- switch (histogram->histogram_chan)
+ /* exclude overexposed and underexposed */
+ for (i = 1; i < HISTMAP_SIZE - 1; i++)
{
- 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 (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 (histmap->max[i] > max) max = histmap->max[i];
}
- if (flag && histogram->histmap[i] > max) max = histogram->histmap[i];
- }
- logmax = log(max);
- for (i=0; i<width; 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 * HISTOGRAM_SIZE / width;
- gint combine = (HISTOGRAM_SIZE - 1) / width + 1;
+ gint ii = i * HISTMAP_SIZE / width;
+ gint xpos = x + i;
+ gint num_chan;
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
+ 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; 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)
+ for (j = 0; combine > 1 && j < 4; j++)
+ v[j] /= combine;
+
+ num_chan = (histogram->histogram_channel == HCHAN_RGB) ? 3 : 1;
+ for (j = 0; j < num_chan; j++)
{
- 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;
+ gint chanmax;
+ if (histogram->histogram_channel == HCHAN_RGB)
+ {
+ chanmax = HCHAN_R;
+ if (v[HCHAN_G] > v[HCHAN_R]) chanmax = HCHAN_G;
+ if (v[HCHAN_B] > v[chanmax]) chanmax = HCHAN_B;
}
- 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);
- if (histogram->histogram_chan >= HCHAN_RGB
- || max2 == histogram->histogram_chan)
- pixbuf_draw_line(pixbuf,
+ {
+ chanmax = histogram->histogram_channel;
+ }
+
+ {
+ gulong pt;
+ gint r = rplus;
+ gint g = gplus;
+ gint b = bplus;
+
+ switch (chanmax)
+ {
+ case HCHAN_R: rplus = r = 255; break;
+ case HCHAN_G: gplus = g = 255; break;
+ case HCHAN_B: bplus = b = 255; break;
+ }
+
+ switch (histogram->histogram_channel)
+ {
+ 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->histogram_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,
- x + i, y + height, x + i, y + height-pt,
+ xpos, ypos, xpos, ypos - pt,
r, g, b, 255);
- v[max2] = -1;
+ }
+
+ v[chanmax] = -1;
}
}
+
return TRUE;
}
+
+void histogram_notify_cb(FileData *fd, NotifyType type, gpointer data)
+{
+ if ((type & NOTIFY_REREAD) && fd->histmap)
+ {
+ DEBUG_1("Notify histogram: %s %04x", fd->path, type);
+ histmap_free(fd->histmap);
+ fd->histmap = NULL;
+ }
+}
+
+/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */
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