static void
gimp_threshold_tool_auto_clicked (GtkWidget *button,
GimpThresholdTool *t_tool)
{
GimpTool *tool = GIMP_TOOL (t_tool);
GimpWaitable *waitable;
waitable = gimp_trivially_cancelable_waitable_new (
GIMP_WAITABLE (t_tool->histogram_async));
gimp_wait (tool->tool_info->gimp, waitable, _("Calculating histogram..."));
g_object_unref (waitable);
if (gimp_async_is_synced (t_tool->histogram_async) &&
gimp_async_is_finished (t_tool->histogram_async))
{
GimpHistogramChannel channel;
gint n_bins;
gdouble low;
g_object_get (GIMP_FILTER_TOOL (t_tool)->config,
"channel", &channel,
NULL);
n_bins = gimp_histogram_n_bins (t_tool->histogram);
low = gimp_histogram_get_threshold (t_tool->histogram,
channel,
0, n_bins - 1);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low, n_bins - 1);
}
}
static void
gimp_threshold_tool_histogram_range (GimpHistogramView *widget,
gint start,
gint end,
GimpThresholdTool *t_tool)
{
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (t_tool);
gint n_bins = gimp_histogram_n_bins (t_tool->histogram);
gdouble low = (gdouble) start / (n_bins - 1);
gdouble high = (gdouble) end / (n_bins - 1);
gdouble config_low;
gdouble config_high;
g_object_get (filter_tool->config,
"low", &config_low,
"high", &config_high,
NULL);
if (low != config_low ||
high != config_high)
{
g_object_set (filter_tool->config,
"low", low,
"high", high,
NULL);
}
}
static void
gimp_threshold_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
GimpToolOptions *tool_options = GIMP_TOOL_GET_OPTIONS (image_map_tool);
GimpThresholdConfig *config = t_tool->config;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *menu;
GtkWidget *box;
GtkWidget *button;
gint n_bins;
main_vbox = gimp_image_map_tool_dialog_get_vbox (image_map_tool);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
menu = gimp_prop_enum_icon_box_new (G_OBJECT (tool_options),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), menu, FALSE, FALSE, 0);
gtk_widget_show (menu);
box = gimp_histogram_box_new ();
gtk_box_pack_start (GTK_BOX (main_vbox), box, TRUE, TRUE, 0);
gtk_widget_show (box);
t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
n_bins = gimp_histogram_n_bins (t_tool->histogram);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
config->low * (n_bins - 0.0001),
config->high * (n_bins - 0.0001));
g_signal_connect (t_tool->histogram_box->view, "range-changed",
G_CALLBACK (gimp_threshold_tool_histogram_range),
t_tool);
gimp_histogram_options_connect_view (GIMP_HISTOGRAM_OPTIONS (tool_options),
t_tool->histogram_box->view);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
button = gtk_button_new_with_mnemonic (_("_Auto"));
gtk_box_pack_end (GTK_BOX (hbox), button, FALSE, FALSE, 0);
gimp_help_set_help_data (button, _("Automatically adjust to optimal "
"binarization threshold"), NULL);
gtk_widget_show (button);
g_signal_connect (button, "clicked",
G_CALLBACK (gimp_threshold_tool_auto_clicked),
t_tool);
}
static gboolean
gimp_threshold_tool_initialize (GimpTool *tool,
GimpDisplay *display,
GError **error)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (tool);
GimpFilterTool *filter_tool = GIMP_FILTER_TOOL (tool);
GimpImage *image = gimp_display_get_image (display);
GimpDrawable *drawable = gimp_image_get_active_drawable (image);
gdouble low;
gdouble high;
gint n_bins;
if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
{
return FALSE;
}
g_clear_object (&t_tool->histogram_async);
g_object_get (filter_tool->config,
"low", &low,
"high", &high,
NULL);
/* this is a hack to make sure that
* 'gimp_histogram_n_bins (t_tool->histogram)' returns the correct value for
* 'drawable' before the asynchronous calculation of its histogram is
* finished.
*/
{
GeglBuffer *temp;
temp = gegl_buffer_new (GEGL_RECTANGLE (0, 0, 1, 1),
gimp_drawable_get_format (drawable));
gimp_histogram_calculate (t_tool->histogram,
temp, GEGL_RECTANGLE (0, 0, 1, 1),
NULL, NULL);
g_object_unref (temp);
}
n_bins = gimp_histogram_n_bins (t_tool->histogram);
t_tool->histogram_async = gimp_drawable_calculate_histogram_async (
drawable, t_tool->histogram, FALSE);
gimp_histogram_view_set_histogram (t_tool->histogram_box->view,
t_tool->histogram);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low * (n_bins - 0.0001),
high * (n_bins - 0.0001));
return TRUE;
}
static void
gimp_histogram_editor_info_update (GimpHistogramEditor *editor)
{
GimpHistogramView *view = GIMP_HISTOGRAM_BOX (editor->box)->view;
GimpHistogram *hist = editor->histogram;
if (hist)
{
gint n_bins;
gdouble pixels;
gdouble count;
gchar text[12];
n_bins = gimp_histogram_n_bins (hist);
pixels = gimp_histogram_get_count (hist, view->channel, 0, n_bins - 1);
count = gimp_histogram_get_count (hist, view->channel,
view->start, view->end);
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_mean (hist, view->channel,
view->start, view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[0]), text);
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_std_dev (hist, view->channel,
view->start, view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[1]), text);
g_snprintf (text, sizeof (text), "%.3f",
gimp_histogram_get_median (hist, view->channel,
view->start,
view->end));
gtk_label_set_text (GTK_LABEL (editor->labels[2]), text);
g_snprintf (text, sizeof (text), "%d", (gint) pixels);
gtk_label_set_text (GTK_LABEL (editor->labels[3]), text);
g_snprintf (text, sizeof (text), "%d", (gint) count);
gtk_label_set_text (GTK_LABEL (editor->labels[4]), text);
g_snprintf (text, sizeof (text), "%.1f", (pixels > 0 ?
(100.0 * count / pixels) :
0.0));
gtk_label_set_text (GTK_LABEL (editor->labels[5]), text);
}
else
{
gint i;
for (i = 0; i < 6; i++)
gtk_label_set_text (GTK_LABEL (editor->labels[i]), NULL);
}
}
static void
gimp_threshold_tool_auto_clicked (GtkWidget *button,
GimpThresholdTool *t_tool)
{
GimpDrawable *drawable = GIMP_IMAGE_MAP_TOOL (t_tool)->drawable;
gint n_bins = gimp_histogram_n_bins (t_tool->histogram);
gdouble low;
low = gimp_histogram_get_threshold (t_tool->histogram,
gimp_drawable_is_rgb (drawable) ?
GIMP_HISTOGRAM_RGB :
GIMP_HISTOGRAM_VALUE,
0, n_bins - 1);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low, n_bins - 1);
}
static void
gimp_threshold_tool_config_notify (GObject *object,
GParamSpec *pspec,
GimpThresholdTool *t_tool)
{
GimpThresholdConfig *config = GIMP_THRESHOLD_CONFIG (object);
gint n_bins;
if (! t_tool->histogram_box)
return;
n_bins = gimp_histogram_n_bins (t_tool->histogram);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
config->low * (n_bins - 0.0001),
config->high * (n_bins - 0.0001));
}
static void
gimp_threshold_tool_histogram_range (GimpHistogramView *widget,
gint start,
gint end,
GimpThresholdTool *t_tool)
{
gint n_bins = gimp_histogram_n_bins (t_tool->histogram);
gdouble low = (gdouble) start / (n_bins - 1);
gdouble high = (gdouble) end / (n_bins - 1);
if (low != t_tool->config->low ||
high != t_tool->config->high)
{
g_object_set (t_tool->config,
"low", low,
"high", high,
NULL);
}
}
static void
gimp_threshold_tool_config_notify (GimpFilterTool *filter_tool,
GimpConfig *config,
const GParamSpec *pspec)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (filter_tool);
GIMP_FILTER_TOOL_CLASS (parent_class)->config_notify (filter_tool,
config, pspec);
if (! t_tool->histogram_box)
return;
if (! strcmp (pspec->name, "channel"))
{
GimpHistogramChannel channel;
g_object_get (config,
"channel", &channel,
NULL);
gimp_histogram_view_set_channel (t_tool->histogram_box->view,
channel);
}
else if (! strcmp (pspec->name, "low") ||
! strcmp (pspec->name, "high"))
{
gdouble low;
gdouble high;
gint n_bins;
g_object_get (config,
"low", &low,
"high", &high,
NULL);
n_bins = gimp_histogram_n_bins (t_tool->histogram);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low * (n_bins - 0.0001),
high * (n_bins - 0.0001));
}
}
void
gimp_levels_config_stretch_channel (GimpLevelsConfig *config,
GimpHistogram *histogram,
GimpHistogramChannel channel)
{
gdouble count;
gdouble bias = 0.006;
gint n_bins;
gint i;
g_return_if_fail (GIMP_IS_LEVELS_CONFIG (config));
g_return_if_fail (histogram != NULL);
g_object_freeze_notify (G_OBJECT (config));
config->gamma[channel] = 1.0;
config->low_output[channel] = 0.0;
config->high_output[channel] = 1.0;
n_bins = gimp_histogram_n_bins (histogram);
count = gimp_histogram_get_count (histogram, channel, 0, n_bins - 1);
if (count == 0.0)
{
config->low_input[channel] = 0.0;
config->high_input[channel] = 0.0;
}
else
{
gdouble new_count;
gdouble percentage;
gdouble next_percentage;
/* Set the low input */
new_count = 0.0;
for (i = 0; i < (n_bins - 1); i++)
{
new_count += gimp_histogram_get_value (histogram, channel, i);
percentage = new_count / count;
next_percentage = (new_count +
gimp_histogram_get_value (histogram,
channel,
i + 1)) / count;
if (fabs (percentage - bias) < fabs (next_percentage - bias))
{
config->low_input[channel] = (gdouble) (i + 1) / (n_bins - 1);
break;
}
}
/* Set the high input */
new_count = 0.0;
for (i = (n_bins - 1); i > 0; i--)
{
new_count += gimp_histogram_get_value (histogram, channel, i);
percentage = new_count / count;
next_percentage = (new_count +
gimp_histogram_get_value (histogram,
channel,
i - 1)) / count;
if (fabs (percentage - bias) < fabs (next_percentage - bias))
{
config->high_input[channel] = (gdouble) (i - 1) / (n_bins - 1);
break;
}
}
}
g_object_notify (G_OBJECT (config), "gamma");
g_object_notify (G_OBJECT (config), "low-input");
g_object_notify (G_OBJECT (config), "high-input");
g_object_notify (G_OBJECT (config), "low-output");
g_object_notify (G_OBJECT (config), "high-output");
g_object_thaw_notify (G_OBJECT (config));
}
