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gimp/app/tools/gimpthresholdtool.c

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/* The GIMP -- an 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 "config/gimpbaseconfig.h"
#include "core/gimp.h"
#include "core/gimpdrawable.h"
#include "core/gimpdrawable-histogram.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.h"
#include "core/gimptoolinfo.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimphistogrambox.h"
#include "widgets/gimphistogramview.h"
#include "display/gimpdisplay.h"
#include "gimpthresholdtool.h"
#include "gimp-intl.h"
#define LOW 0x1
#define HIGH 0x2
#define HISTOGRAM 0x4
#define ALL (LOW | HIGH | HISTOGRAM)
/* local function prototypes */
static void gimp_threshold_tool_class_init (GimpThresholdToolClass *klass);
static void gimp_threshold_tool_init (GimpThresholdTool *threshold_tool);
static void gimp_threshold_tool_finalize (GObject *object);
static void gimp_threshold_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp);
static void gimp_threshold_tool_map (GimpImageMapTool *image_map_tool);
static void gimp_threshold_tool_dialog (GimpImageMapTool *image_map_tool);
static void gimp_threshold_tool_reset (GimpImageMapTool *image_map_tool);
static void gimp_threshold_tool_histogram_range (GimpHistogramView *view,
gint start,
gint end,
GimpThresholdTool *t_tool);
static GimpImageMapToolClass *parent_class = NULL;
/* public functions */
void
gimp_threshold_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_THRESHOLD_TOOL,
G_TYPE_NONE, NULL,
0,
"gimp-threshold-tool",
_("Threshold"),
_("Reduce image to two colors using a threshold"),
N_("/Tools/Color Tools/_Threshold..."), NULL,
NULL, GIMP_HELP_TOOL_THRESHOLD,
GIMP_STOCK_TOOL_THRESHOLD,
data);
}
GType
gimp_threshold_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpThresholdToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_threshold_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpThresholdTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_threshold_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_IMAGE_MAP_TOOL,
"GimpThresholdTool",
&tool_info, 0);
}
return tool_type;
}
/* private functions */
static void
gimp_threshold_tool_class_init (GimpThresholdToolClass *klass)
{
GObjectClass *object_class;
GimpToolClass *tool_class;
GimpImageMapToolClass *image_map_tool_class;
object_class = G_OBJECT_CLASS (klass);
tool_class = GIMP_TOOL_CLASS (klass);
image_map_tool_class = GIMP_IMAGE_MAP_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_threshold_tool_finalize;
tool_class->initialize = gimp_threshold_tool_initialize;
image_map_tool_class->map = gimp_threshold_tool_map;
image_map_tool_class->dialog = gimp_threshold_tool_dialog;
image_map_tool_class->reset = gimp_threshold_tool_reset;
}
static void
gimp_threshold_tool_init (GimpThresholdTool *t_tool)
{
GimpImageMapTool *image_map_tool;
image_map_tool = GIMP_IMAGE_MAP_TOOL (t_tool);
image_map_tool->shell_identifier = "gimp-threshold-tool-dialog";
image_map_tool->shell_desc = _("Apply Threshold");
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;
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 void
gimp_threshold_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp)
{
GimpThresholdTool *t_tool;
GimpDrawable *drawable;
t_tool = GIMP_THRESHOLD_TOOL (tool);
drawable = gimp_image_active_drawable (gdisp->gimage);
if (gimp_drawable_is_indexed (drawable))
{
g_message (_("Threshold does not operate on indexed drawables."));
return;
}
if (!t_tool->hist)
{
Gimp *gimp = GIMP_TOOL (t_tool)->tool_info->gimp;
t_tool->hist = gimp_histogram_new (GIMP_BASE_CONFIG (gimp->config));
}
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, gdisp);
gimp_drawable_calculate_histogram (drawable, t_tool->hist);
g_signal_handlers_block_by_func (t_tool->histogram_box->histogram,
gimp_threshold_tool_histogram_range,
t_tool);
gimp_histogram_view_set_histogram (t_tool->histogram_box->histogram,
t_tool->hist);
gimp_histogram_view_set_range (t_tool->histogram_box->histogram,
t_tool->threshold->low_threshold,
t_tool->threshold->high_threshold);
g_signal_handlers_unblock_by_func (t_tool->histogram_box->histogram,
gimp_threshold_tool_histogram_range,
t_tool);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (t_tool));
}
static void
gimp_threshold_tool_map (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool;
t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
gimp_image_map_apply (image_map_tool->image_map,
threshold,
t_tool->threshold);
}
/**********************/
/* Threshold dialog */
/**********************/
static void
gimp_threshold_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool;
GtkWidget *box;
t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
box = gimp_histogram_box_new (_("Threshold Range:"));
gtk_container_add (GTK_CONTAINER (image_map_tool->main_vbox), box);
gtk_widget_show (box);
t_tool->histogram_box = GIMP_HISTOGRAM_BOX (box);
g_signal_connect (t_tool->histogram_box->histogram, "range_changed",
G_CALLBACK (gimp_threshold_tool_histogram_range),
t_tool);
}
static void
gimp_threshold_tool_reset (GimpImageMapTool *image_map_tool)
{
GimpThresholdTool *t_tool;
t_tool = GIMP_THRESHOLD_TOOL (image_map_tool);
t_tool->threshold->low_threshold = 127.0;
t_tool->threshold->high_threshold = 255.0;
gimp_histogram_view_set_range (t_tool->histogram_box->histogram,
t_tool->threshold->low_threshold,
t_tool->threshold->high_threshold);
}
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));
}
}
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