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gimp/app/tools/gimpposterizetool.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/gimplut.h"
#include "base/lut-funcs.h"
#include "core/gimpdrawable.h"
#include "core/gimpimage.h"
#include "core/gimpimagemap.h"
#include "widgets/gimphelp-ids.h"
#include "display/gimpdisplay.h"
#include "gimpimagemapoptions.h"
#include "gimpposterizetool.h"
#include "gimp-intl.h"
#define POSTERIZE_DEFAULT_LEVELS 3
#define SLIDER_WIDTH 200
static void gimp_posterize_tool_class_init (GimpPosterizeToolClass *klass);
static void gimp_posterize_tool_init (GimpPosterizeTool *bc_tool);
static void gimp_posterize_tool_finalize (GObject *object);
static gboolean gimp_posterize_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp);
static void gimp_posterize_tool_map (GimpImageMapTool *image_map_tool);
static void gimp_posterize_tool_dialog (GimpImageMapTool *image_map_tool);
static void gimp_posterize_tool_reset (GimpImageMapTool *image_map_tool);
static void posterize_levels_adjustment_update (GtkAdjustment *adjustment,
GimpPosterizeTool *posterize_tool);
static GimpImageMapToolClass *parent_class = NULL;
/* functions */
void
gimp_posterize_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_POSTERIZE_TOOL,
GIMP_TYPE_IMAGE_MAP_OPTIONS, NULL,
0,
"gimp-posterize-tool",
_("Posterize"),
_("Reduce image to a fixed number of colors"),
N_("_Posterize..."), NULL,
NULL, GIMP_HELP_TOOL_POSTERIZE,
GIMP_STOCK_TOOL_POSTERIZE,
data);
}
GType
gimp_posterize_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpPosterizeToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_posterize_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPosterizeTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_posterize_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_IMAGE_MAP_TOOL,
"GimpPosterizeTool",
&tool_info, 0);
}
return tool_type;
}
static void
gimp_posterize_tool_class_init (GimpPosterizeToolClass *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_posterize_tool_finalize;
tool_class->initialize = gimp_posterize_tool_initialize;
image_map_tool_class->shell_desc = _("Posterize (Reduce Number of Colors)");
image_map_tool_class->map = gimp_posterize_tool_map;
image_map_tool_class->dialog = gimp_posterize_tool_dialog;
image_map_tool_class->reset = gimp_posterize_tool_reset;
}
static void
gimp_posterize_tool_init (GimpPosterizeTool *posterize_tool)
{
posterize_tool->levels = POSTERIZE_DEFAULT_LEVELS;
posterize_tool->lut = gimp_lut_new ();
}
static void
gimp_posterize_tool_finalize (GObject *object)
{
GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (object);
if (posterize_tool->lut)
{
gimp_lut_free (posterize_tool->lut);
posterize_tool->lut = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gimp_posterize_tool_initialize (GimpTool *tool,
GimpDisplay *gdisp)
{
GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (tool);
GimpDrawable *drawable;
drawable = gimp_image_active_drawable (gdisp->gimage);
if (! drawable)
return FALSE;
if (gimp_drawable_is_indexed (drawable))
{
g_message (_("Posterize does not operate on indexed layers."));
return FALSE;
}
posterize_tool->levels = POSTERIZE_DEFAULT_LEVELS;
GIMP_TOOL_CLASS (parent_class)->initialize (tool, gdisp);
gtk_adjustment_set_value (GTK_ADJUSTMENT (posterize_tool->levels_data),
posterize_tool->levels);
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (posterize_tool));
return TRUE;
}
static void
gimp_posterize_tool_map (GimpImageMapTool *image_map_tool)
{
GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (image_map_tool);
posterize_lut_setup (posterize_tool->lut,
posterize_tool->levels,
gimp_drawable_bytes (image_map_tool->drawable));
gimp_image_map_apply (image_map_tool->image_map,
(GimpImageMapApplyFunc) gimp_lut_process,
posterize_tool->lut);
}
/**********************/
/* Posterize dialog */
/**********************/
static void
gimp_posterize_tool_dialog (GimpImageMapTool *image_map_tool)
{
GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (image_map_tool);
GtkWidget *table;
GtkWidget *slider;
GtkObject *data;
/* The table containing sliders */
table = gtk_table_new (1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_box_pack_start (GTK_BOX (image_map_tool->main_vbox), table,
FALSE, FALSE, 0);
gtk_widget_show (table);
data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Posterize _levels:"), SLIDER_WIDTH, -1,
posterize_tool->levels,
2.0, 256.0, 1.0, 10.0, 0,
TRUE, 0.0, 0.0,
NULL, NULL);
posterize_tool->levels_data = GTK_ADJUSTMENT (data);
slider = GIMP_SCALE_ENTRY_SCALE (data);
gtk_range_set_update_policy (GTK_RANGE (slider), GTK_UPDATE_DELAYED);
g_signal_connect (posterize_tool->levels_data, "value-changed",
G_CALLBACK (posterize_levels_adjustment_update),
posterize_tool);
}
static void
gimp_posterize_tool_reset (GimpImageMapTool *image_map_tool)
{
GimpPosterizeTool *posterize_tool = GIMP_POSTERIZE_TOOL (image_map_tool);
posterize_tool->levels = POSTERIZE_DEFAULT_LEVELS;
gtk_adjustment_set_value (GTK_ADJUSTMENT (posterize_tool->levels_data),
posterize_tool->levels);
}
static void
posterize_levels_adjustment_update (GtkAdjustment *adjustment,
GimpPosterizeTool *posterize_tool)
{
if (posterize_tool->levels != adjustment->value)
{
posterize_tool->levels = adjustment->value;
gimp_image_map_tool_preview (GIMP_IMAGE_MAP_TOOL (posterize_tool));
}
}
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