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gimp/plug-ins/common/threshold_alpha.c

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/* threshold_alpha.c -- This is a plug-in for the GIMP (1.0's API)
* Author: Shuji Narazaki <narazaki@InetQ.or.jp>
* Time-stamp: <2000-01-09 13:25:30 yasuhiro>
* Version: 0.13A (the 'A' is for Adam who hacked in greyscale
* support - don't know if there's a more recent official
* version)
*
* Copyright (C) 1997 Shuji Narazaki <narazaki@InetQ.or.jp>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_NAME "plug_in_threshold_alpha"
#define SHORT_NAME "threshold_alpha"
#define PROGRESS_UPDATE_NUM 100
#define SCALE_WIDTH 120
static void query (void);
static void run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals);
static GStatusType threshold_alpha (gint32 drawable_id);
static gint threshold_alpha_dialog (void);
static void threshold_alpha_ok_callback (GtkWidget *widget,
gpointer data);
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
typedef struct
{
gint threshold;
} ValueType;
static ValueType VALS =
{
127
};
typedef struct
{
gint run;
} Interface;
static Interface INTERFACE =
{
FALSE
};
MAIN ()
static void
query (void)
{
static GParamDef args [] =
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive"},
{ PARAM_IMAGE, "image", "Input image (not used)"},
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_INT32, "threshold", "Threshold" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
gimp_install_procedure (PLUG_IN_NAME,
"",
"",
"Shuji Narazaki (narazaki@InetQ.or.jp)",
"Shuji Narazaki",
"1997",
N_("<Image>/Image/Alpha/Threshold Alpha..."),
"RGBA,GRAYA",
PROC_PLUG_IN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GStatusType status = STATUS_SUCCESS;
GRunModeType run_mode;
gint drawable_id;
run_mode = param[0].data.d_int32;
drawable_id = param[2].data.d_int32;
if (run_mode != RUN_INTERACTIVE)
{
INIT_I18N();
}
else
{
INIT_I18N_UI();
}
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case RUN_INTERACTIVE:
/* Since a channel might be selected, we must check wheter RGB or not. */
if (gimp_layer_get_preserve_transparency (drawable_id))
{
g_message (_("The layer preserves transparency."));
return;
}
if (!gimp_drawable_is_rgb (drawable_id) &&
!gimp_drawable_is_gray (drawable_id))
{
g_message (_("RGBA/GRAYA drawable is not selected."));
return;
}
gimp_get_data (PLUG_IN_NAME, &VALS);
if (! threshold_alpha_dialog ())
return;
break;
case RUN_NONINTERACTIVE:
if (nparams != 4)
{
status = STATUS_CALLING_ERROR;
}
else
{
VALS.threshold = param[3].data.d_int32;
}
break;
case RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_NAME, &VALS);
break;
}
if (status == STATUS_SUCCESS)
{
status = threshold_alpha (drawable_id);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == RUN_INTERACTIVE && status == STATUS_SUCCESS)
gimp_set_data (PLUG_IN_NAME, &VALS, sizeof (ValueType));
}
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
}
static GStatusType
threshold_alpha (gint32 drawable_id)
{
GDrawable *drawable;
GPixelRgn src_rgn, dest_rgn;
guchar *src, *dest;
gpointer pr;
gint x, y, x1, x2, y1, y2;
gint gap, total, processed = 0;
drawable = gimp_drawable_get (drawable_id);
if (! gimp_drawable_has_alpha (drawable_id))
return STATUS_EXECUTION_ERROR;
if (gimp_drawable_is_rgb (drawable_id))
gap = 3;
else
gap = 1;
gimp_drawable_mask_bounds (drawable_id, &x1, &y1, &x2, &y2);
total = (x2 - x1) * (y2 - y1);
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
gimp_progress_init (_("Threshold Alpha: Coloring Transparency..."));
for (; pr != NULL; pr = gimp_pixel_rgns_process (pr))
{
gint offset, index;
for (y = 0; y < src_rgn.h; y++)
{
src = src_rgn.data + y * src_rgn.rowstride;
dest = dest_rgn.data + y * dest_rgn.rowstride;
offset = 0;
for (x = 0; x < src_rgn.w; x++)
{
for (index = 0; index < gap; index++)
*dest++ = *src++;
*dest++ = (VALS.threshold < *src++) ? 255 : 0;
if ((++processed % (total / PROGRESS_UPDATE_NUM)) == 0)
gimp_progress_update ((double) processed /(double) total);
}
}
}
gimp_progress_update (1.0);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
gimp_drawable_detach (drawable);
return STATUS_SUCCESS;
}
/* dialog stuff */
static gint
threshold_alpha_dialog (void)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkObject *adj;
gimp_ui_init ("threshold_alpha", FALSE);
dlg = gimp_dialog_new (_("Threshold Alpha"), "threshold_alpha",
gimp_standard_help_func, "filters/threshold_alpha.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), threshold_alpha_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
frame = gtk_frame_new (_("Parameter Settings"));
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (1 ,3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Threshold:"), SCALE_WIDTH, 0,
VALS.threshold, 0, 255, 1, 8, 0,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (gimp_int_adjustment_update),
&VALS.threshold);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return INTERFACE.run;
}
static void
threshold_alpha_ok_callback (GtkWidget *widget,
gpointer data)
{
INTERFACE.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
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