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gimp/plug-ins/common/threshold_alpha.c

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/* threshold_alpha.c -- This is a plug-in for 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-threshold-alpha"
#define PLUG_IN_BINARY "threshold_alpha"
#define SCALE_WIDTH 120
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void threshold_alpha (GimpDrawable *drawable,
GimpPreview *preview);
static gboolean threshold_alpha_dialog (GimpDrawable *drawable);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
typedef struct
{
gint threshold;
} ValueType;
static ValueType VALS =
{
127 /* threshold */
};
MAIN ()
static void
query (void)
{
static const GimpParamDef args [] =
{
{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (not used)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "threshold", "Threshold" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Make transparency all-or-nothing"),
"",
"Shuji Narazaki (narazaki@InetQ.or.jp)",
"Shuji Narazaki",
"1997",
N_("_Threshold Alpha..."),
"RGBA,GRAYA",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC,
"<Image>/Layer/Transparency/Modify");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
GimpRunMode run_mode;
GimpDrawable *drawable;
run_mode = param[0].data.d_int32;
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Since a channel might be selected, we must check wheter RGB or not. */
if (gimp_layer_get_lock_alpha (drawable->drawable_id))
{
g_message (_("The layer has its alpha channel locked."));
return;
}
if (!gimp_drawable_is_rgb (drawable->drawable_id) &&
!gimp_drawable_is_gray (drawable->drawable_id))
{
g_message (_("RGBA/GRAYA drawable is not selected."));
return;
}
gimp_get_data (PLUG_IN_PROC, &VALS);
if (! threshold_alpha_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
if (nparams != 4)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
VALS.threshold = param[3].data.d_int32;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &VALS);
break;
}
if (status == GIMP_PDB_SUCCESS)
{
if (gimp_drawable_has_alpha (drawable->drawable_id))
{
gimp_progress_init (_("Coloring transparency"));
threshold_alpha (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE && status == GIMP_PDB_SUCCESS)
gimp_set_data (PLUG_IN_PROC, &VALS, sizeof (ValueType));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
gimp_drawable_detach (drawable);
}
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
}
static void
threshold_alpha_func (const guchar *src,
guchar *dest,
gint bpp)
{
for (bpp--; bpp; bpp--)
*dest++ = *src++;
*dest = (VALS.threshold < *src) ? 255 : 0;
}
static void
threshold_alpha (GimpDrawable *drawable,
GimpPreview *preview)
{
if (preview)
{
GimpPixelRgn src_rgn;
guchar *src, *dst;
gint i;
gint x1, y1;
gint width, height;
gint bpp;
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
bpp = drawable->bpp;
src = g_new (guchar, width * height * bpp);
dst = g_new (guchar, width * height * bpp);
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height,
FALSE, FALSE);
gimp_pixel_rgn_get_rect (&src_rgn, src, x1, y1, width, height);
for (i = 0; i < width * height; i++)
threshold_alpha_func (src + i * bpp, dst + i * bpp, bpp);
gimp_preview_draw_buffer (preview, dst, width * bpp);
g_free (src);
g_free (dst);
}
else
{
gimp_rgn_iterate2 (drawable, 0 /* unused */,
(GimpRgnFunc2)threshold_alpha_func, NULL);
}
}
static gboolean
threshold_alpha_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *table;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Threshold Alpha"), PLUG_IN_BINARY,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
gimp_window_set_transient (GTK_WINDOW (dialog));
main_vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (threshold_alpha),
drawable);
table = gtk_table_new (1 ,3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_container_set_border_width (GTK_CONTAINER (table), 12);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
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);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_int_adjustment_update),
&VALS.threshold);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
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