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gimp/app/tools/gimpthresholdtool.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpconfig/gimpconfig.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-gui.h"
#include "core/gimpasync.h"
#include "core/gimpcancelable.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimphistogram.h"
#include "core/gimpimage.h"
#include "core/gimptoolinfo.h"
#include "core/gimptriviallycancelablewaitable.h"
#include "core/gimpwaitable.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimphistogrambox.h"
#include "widgets/gimphistogramview.h"
#include "display/gimpdisplay.h"
#include "gimphistogramoptions.h"
#include "gimpthresholdtool.h"
#include "gimptooloptions-gui.h"
#include "gimp-intl.h"
/* local function prototypes */
static void gimp_threshold_tool_finalize (GObject *object);
static gboolean gimp_threshold_tool_initialize (GimpTool *tool,
GimpDisplay *display,
GError **error);
static gchar * gimp_threshold_tool_get_operation (GimpFilterTool *filter_tool,
gchar **description);
static void gimp_threshold_tool_dialog (GimpFilterTool *filter_tool);
static void gimp_threshold_tool_config_notify (GimpFilterTool *filter_tool,
GimpConfig *config,
const GParamSpec *pspec);
static gboolean gimp_threshold_tool_channel_sensitive
(gint value,
gpointer data);
static void gimp_threshold_tool_histogram_range (GimpHistogramView *view,
gint start,
gint end,
GimpThresholdTool *t_tool);
static void gimp_threshold_tool_auto_clicked (GtkWidget *button,
GimpThresholdTool *t_tool);
G_DEFINE_TYPE (GimpThresholdTool, gimp_threshold_tool,
GIMP_TYPE_FILTER_TOOL)
#define parent_class gimp_threshold_tool_parent_class
void
gimp_threshold_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_THRESHOLD_TOOL,
GIMP_TYPE_HISTOGRAM_OPTIONS,
NULL,
0,
"gimp-threshold-tool",
_("Threshold"),
_("Reduce image to two colors using a threshold"),
N_("_Threshold..."), NULL,
NULL, GIMP_HELP_TOOL_THRESHOLD,
GIMP_ICON_TOOL_THRESHOLD,
data);
}
static void
gimp_threshold_tool_class_init (GimpThresholdToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
GimpFilterToolClass *filter_tool_class = GIMP_FILTER_TOOL_CLASS (klass);
object_class->finalize = gimp_threshold_tool_finalize;
tool_class->initialize = gimp_threshold_tool_initialize;
filter_tool_class->get_operation = gimp_threshold_tool_get_operation;
filter_tool_class->dialog = gimp_threshold_tool_dialog;
filter_tool_class->config_notify = gimp_threshold_tool_config_notify;
}
static void
gimp_threshold_tool_init (GimpThresholdTool *t_tool)
{
t_tool->histogram = gimp_histogram_new (FALSE);
}
static void
gimp_threshold_tool_finalize (GObject *object)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (object);
g_clear_object (&t_tool->histogram);
g_clear_object (&t_tool->histogram_async);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
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);
GList *drawables;
GimpDrawable *drawable;
gdouble low;
gdouble high;
gint n_bins;
if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
{
return FALSE;
}
drawables = gimp_image_get_selected_drawables (image);
if (g_list_length (drawables) != 1)
{
if (g_list_length (drawables) > 1)
gimp_tool_message_literal (tool, display,
_("Cannot modify multiple drawables. Select only one."));
else
gimp_tool_message_literal (tool, display, _("No selected drawables."));
g_list_free (drawables);
return FALSE;
}
drawable = drawables->data;
g_list_free (drawables);
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 gchar *
gimp_threshold_tool_get_operation (GimpFilterTool *filter_tool,
gchar **description)
{
*description = g_strdup (_("Apply Threshold"));
return g_strdup ("gimp:threshold");
}
/**********************/
/* Threshold dialog */
/**********************/
static void
gimp_threshold_tool_dialog (GimpFilterTool *filter_tool)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (filter_tool);
GimpToolOptions *tool_options = GIMP_TOOL_GET_OPTIONS (filter_tool);
GtkWidget *main_vbox;
GtkWidget *main_frame;
GtkWidget *frame_vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *hbox2;
GtkWidget *box;
GtkWidget *button;
GimpHistogramChannel channel;
main_vbox = gimp_filter_tool_dialog_get_vbox (filter_tool);
main_frame = gimp_frame_new (NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), main_frame, TRUE, TRUE, 0);
gtk_widget_show (main_frame);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_frame_set_label_widget (GTK_FRAME (main_frame), hbox);
gtk_widget_show (hbox);
label = gtk_label_new_with_mnemonic (_("Cha_nnel:"));
gimp_label_set_attributes (GTK_LABEL (label),
PANGO_ATTR_WEIGHT, PANGO_WEIGHT_BOLD,
-1);
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
t_tool->channel_menu = gimp_prop_enum_combo_box_new (filter_tool->config,
"channel", -1, -1);
gimp_enum_combo_box_set_icon_prefix (GIMP_ENUM_COMBO_BOX (t_tool->channel_menu),
"gimp-channel");
gimp_int_combo_box_set_sensitivity (GIMP_INT_COMBO_BOX (t_tool->channel_menu),
gimp_threshold_tool_channel_sensitive,
filter_tool, NULL);
gtk_box_pack_start (GTK_BOX (hbox), t_tool->channel_menu, FALSE, FALSE, 0);
gtk_label_set_mnemonic_widget (GTK_LABEL (label), t_tool->channel_menu);
hbox2 = gimp_prop_enum_icon_box_new (G_OBJECT (tool_options),
"histogram-scale", "gimp-histogram",
0, 0);
gtk_box_pack_end (GTK_BOX (hbox), hbox2, FALSE, FALSE, 0);
frame_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 4);
gtk_container_add (GTK_CONTAINER (main_frame), frame_vbox);
gtk_widget_show (frame_vbox);
box = gimp_histogram_box_new ();
gtk_box_pack_start (GTK_BOX (frame_vbox), box, TRUE, TRUE, 0);
gtk_widget_show (box);
t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
g_object_get (filter_tool->config,
"channel", &channel,
NULL);
gimp_histogram_view_set_channel (t_tool->histogram_box->view, channel);
g_signal_connect (t_tool->histogram_box->view, "range-changed",
G_CALLBACK (gimp_threshold_tool_histogram_range),
t_tool);
g_object_bind_property (G_OBJECT (tool_options), "histogram-scale",
G_OBJECT (t_tool->histogram_box->view), "histogram-scale",
G_BINDING_SYNC_CREATE |
G_BINDING_BIDIRECTIONAL);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_box_pack_start (GTK_BOX (frame_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 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));
}
}
static gboolean
gimp_threshold_tool_channel_sensitive (gint value,
gpointer data)
{
GList *drawables = GIMP_TOOL (data)->drawables;
GimpDrawable *drawable;
GimpHistogramChannel channel = value;
if (!drawables)
return FALSE;
g_return_val_if_fail (g_list_length (drawables) == 1, FALSE);
drawable = drawables->data;
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
return TRUE;
case GIMP_HISTOGRAM_RED:
case GIMP_HISTOGRAM_GREEN:
case GIMP_HISTOGRAM_BLUE:
return gimp_drawable_is_rgb (drawable);
case GIMP_HISTOGRAM_ALPHA:
return gimp_drawable_has_alpha (drawable);
case GIMP_HISTOGRAM_RGB:
return gimp_drawable_is_rgb (drawable);
case GIMP_HISTOGRAM_LUMINANCE:
return gimp_drawable_is_rgb (drawable);
}
return FALSE;
}
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_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);
}
}
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