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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 <http://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 "base/gimphistogram.h"
#include "base/threshold.h"
#include "gegl/gimpthresholdconfig.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimperror.h"
#include "core/gimpimage.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 GeglNode * gimp_threshold_tool_get_operation (GimpImageMapTool *im_tool,
GObject **config);
static void gimp_threshold_tool_map (GimpImageMapTool *im_tool);
static void gimp_threshold_tool_dialog (GimpImageMapTool *im_tool);
static void gimp_threshold_tool_config_notify (GObject *object,
GParamSpec *pspec,
GimpThresholdTool *t_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->dialog_desc = _("Apply Threshold");
im_tool_class->settings_name = "threshold";
im_tool_class->import_dialog_title = _("Import Threshold Settings");
im_tool_class->export_dialog_title = _("Export Threshold Settings");
im_tool_class->get_operation = gimp_threshold_tool_get_operation;
im_tool_class->map = gimp_threshold_tool_map;
im_tool_class->dialog = gimp_threshold_tool_dialog;
}
static void
gimp_threshold_tool_init (GimpThresholdTool *t_tool)
{
GimpImageMapTool *im_tool = GIMP_IMAGE_MAP_TOOL (t_tool);
t_tool->threshold = g_slice_new0 (Threshold);
t_tool->histogram = gimp_histogram_new ();
im_tool->apply_func = (GimpImageMapApplyFunc) threshold;
im_tool->apply_data = t_tool->threshold;
}
static void
gimp_threshold_tool_finalize (GObject *object)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (object);
g_slice_free (Threshold, t_tool->threshold);
if (t_tool->histogram)
{
gimp_histogram_unref (t_tool->histogram);
t_tool->histogram = 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);
GimpImage *image = gimp_display_get_image (display);
GimpDrawable *drawable = gimp_image_get_active_drawable (image);
if (! drawable)
return FALSE;
if (gimp_drawable_is_indexed (drawable))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Threshold does not operate on indexed layers."));
return FALSE;
}
gimp_config_reset (GIMP_CONFIG (t_tool->config));
if (! GIMP_TOOL_CLASS (parent_class)->initialize (tool, display, error))
{
return FALSE;
}
gimp_drawable_calculate_histogram (drawable, t_tool->histogram);
gimp_histogram_view_set_histogram (t_tool->histogram_box->view,
t_tool->histogram);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (t_tool));
return TRUE;
}
static GeglNode *
gimp_threshold_tool_get_operation (GimpImageMapTool *image_map_tool,
GObject **config)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
GeglNode *node;
node = g_object_new (GEGL_TYPE_NODE,
"operation", "gimp:threshold",
NULL);
t_tool->config = g_object_new (GIMP_TYPE_THRESHOLD_CONFIG, NULL);
*config = G_OBJECT (t_tool->config);
g_signal_connect_object (t_tool->config, "notify",
G_CALLBACK (gimp_threshold_tool_config_notify),
G_OBJECT (t_tool), 0);
gegl_node_set (node,
"config", t_tool->config,
NULL);
return node;
}
static void
gimp_threshold_tool_map (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
GimpDrawable *drawable = image_map_tool->drawable;
gimp_threshold_config_to_cruft (t_tool->config, t_tool->threshold,
gimp_drawable_is_rgb (drawable));
}
/**********************/
/* 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);
GimpThresholdConfig *config = t_tool->config;
GtkWidget *main_vbox;
GtkWidget *hbox;
GtkWidget *menu;
GtkWidget *box;
GtkWidget *button;
main_vbox = gimp_image_map_tool_dialog_get_vbox (image_map_tool);
hbox = gtk_hbox_new (FALSE, 6);
gtk_box_pack_start (GTK_BOX (main_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 (main_vbox), box, TRUE, TRUE, 0);
gtk_widget_show (box);
t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
config->low * 255.999,
config->high * 255.999);
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 (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 void
gimp_threshold_tool_config_notify (GObject *object,
GParamSpec *pspec,
GimpThresholdTool *t_tool)
{
GimpThresholdConfig *config = GIMP_THRESHOLD_CONFIG (object);
if (! t_tool->histogram_box)
return;
gimp_histogram_view_set_range (t_tool->histogram_box->view,
config->low * 255.999,
config->high * 255.999);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (t_tool));
}
static void
gimp_threshold_tool_histogram_range (GimpHistogramView *widget,
gint start,
gint end,
GimpThresholdTool *t_tool)
{
gdouble low = start / 255.0;
gdouble high = end / 255.0;
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_auto_clicked (GtkWidget *button,
GimpThresholdTool *t_tool)
{
GimpDrawable *drawable = GIMP_IMAGE_MAP_TOOL (t_tool)->drawable;
gdouble low;
low = gimp_histogram_get_threshold (t_tool->histogram,
gimp_drawable_is_rgb (drawable) ?
GIMP_HISTOGRAM_RGB :
GIMP_HISTOGRAM_VALUE,
0, 255);
gimp_histogram_view_set_range (t_tool->histogram_box->view,
low, 255.0);
}
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