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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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "base/gimphistogram.h"
#include "base/threshold.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.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 "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 void gimp_threshold_tool_map (GimpImageMapTool *im_tool);
static void gimp_threshold_tool_dialog (GimpImageMapTool *im_tool);
static void gimp_threshold_tool_reset (GimpImageMapTool *im_tool);
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_IMAGE_MAP_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,
gimp_histogram_options_gui,
0,
"gimp-threshold-tool",
_("Threshold"),
_("Threshold Tool: Reduce image to two colors using a threshold"),
N_("_Threshold..."), NULL,
NULL, GIMP_HELP_TOOL_THRESHOLD,
GIMP_STOCK_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);
GimpImageMapToolClass *im_tool_class = GIMP_IMAGE_MAP_TOOL_CLASS (klass);
object_class->finalize = gimp_threshold_tool_finalize;
tool_class->initialize = gimp_threshold_tool_initialize;
im_tool_class->shell_desc = _("Apply Threshold");
im_tool_class->map = gimp_threshold_tool_map;
im_tool_class->dialog = gimp_threshold_tool_dialog;
im_tool_class->reset = gimp_threshold_tool_reset;
}
static void
gimp_threshold_tool_init (GimpThresholdTool *t_tool)
{
t_tool->threshold = g_new0 (Threshold, 1);
t_tool->hist = NULL;
t_tool->threshold->low_threshold = 127;
t_tool->threshold->high_threshold = 255;
}
static void
gimp_threshold_tool_finalize (GObject *object)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (object);
if (t_tool->threshold)
{
g_free (t_tool->threshold);
t_tool->threshold = NULL;
}
if (t_tool->hist)
{
gimp_histogram_free (t_tool->hist);
t_tool->hist = NULL;
}
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);
GimpDrawable *drawable;
drawable = gimp_image_active_drawable (display->image);
if (! drawable)
return FALSE;
if (gimp_drawable_is_indexed (drawable))
{
g_set_error (error, 0, 0,
_("Threshold does not operate on indexed layers."));
return FALSE;
}
if (!t_tool->hist)
t_tool->hist = gimp_histogram_new ();
t_tool->threshold->color = gimp_drawable_is_rgb (drawable);
t_tool->threshold->low_threshold = 127;
t_tool->threshold->high_threshold = 255;
GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error);
gimp_drawable_calculate_histogram (drawable, t_tool->hist);
g_signal_handlers_block_by_func (t_tool->histogram_box->view,
gimp_threshold_tool_histogram_range,
t_tool);
gimp_histogram_view_set_histogram (t_tool->histogram_box->view,
t_tool->hist);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
t_tool->threshold->low_threshold,
t_tool->threshold->high_threshold);
g_signal_handlers_unblock_by_func (t_tool->histogram_box->view,
gimp_threshold_tool_histogram_range,
t_tool);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (t_tool));
return TRUE;
}
static void
gimp_threshold_tool_map (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
gimp_image_map_apply (image_map_tool->image_map,
(GimpImageMapApplyFunc) threshold,
t_tool->threshold);
}
/**********************/
/* Threshold dialog */
/**********************/
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);
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *menu;
GtkWidget *box;
GtkWidget *button;
vbox = image_map_tool->main_vbox;
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
menu = gimp_prop_enum_stock_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 (vbox), box, TRUE, TRUE, 0);
gtk_widget_show (box);
t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
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_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (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_reset (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
gimp_histogram_view_set_range (t_tool->histogram_box->view, 127.0, 255.0);
}
static void
gimp_threshold_tool_histogram_range (GimpHistogramView *widget,
gint start,
gint end,
GimpThresholdTool *t_tool)
{
if (start != t_tool->threshold->low_threshold ||
end != t_tool->threshold->high_threshold)
{
t_tool->threshold->low_threshold = start;
t_tool->threshold->high_threshold = end;
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (t_tool));
}
}
static void
gimp_threshold_tool_auto_clicked (GtkWidget *button,
GimpThresholdTool *t_tool)
{
gdouble low_threshold;
low_threshold =
gimp_histogram_get_threshold (t_tool->hist,
(t_tool->threshold->color ?
GIMP_HISTOGRAM_RGB : GIMP_HISTOGRAM_VALUE),
0, 255);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low_threshold, 255.0);
}
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