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gimp/plug-ins/common/noisify.c

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/*
* This is a plugin for the GIMP.
*
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
* Copyright (C) 1996 Torsten Martinsen
*
* 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.
*
* $Id$
*/
/*
* This filter adds random noise to an image.
* The amount of noise can be set individually for each RGB channel.
* This filter does not operate on indexed images.
*
* May 2000 tim copperfield [timecop@japan.co.jp]
* Added dynamic preview.
*
* alt@gimp.org. Fixed previews so they handle alpha channels correctly.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#include "gimpoldpreview.h"
#define SCALE_WIDTH 125
#define TILE_CACHE_SIZE 16
typedef struct
{
gint independent;
gdouble noise[4]; /* per channel */
} NoisifyVals;
typedef struct
{
gint channels;
GtkObject *channel_adj[4];
} NoisifyInterface;
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static void noisify (GimpDrawable *drawable,
gboolean preview_mode);
static gdouble gauss (GRand *gr);
static gint noisify_dialog (GimpDrawable *drawable,
gint channels);
static void noisify_double_adjustment_update (GtkAdjustment *adjustment,
gpointer data);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static NoisifyVals nvals =
{
TRUE,
{ 0.20, 0.20, 0.20, 0.20 }
};
static NoisifyInterface noise_int =
{
0,
{ NULL, NULL, NULL, NULL }
};
static GimpRunMode run_mode;
static GimpOldPreview *preview;
MAIN ()
static void
query (void)
{
static GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "independent", "Noise in channels independent" },
{ GIMP_PDB_FLOAT, "noise_1", "Noise in the first channel (red, gray)" },
{ GIMP_PDB_FLOAT, "noise_2", "Noise in the second channel (green, gray_alpha)" },
{ GIMP_PDB_FLOAT, "noise_3", "Noise in the third channel (blue)" },
{ GIMP_PDB_FLOAT, "noise_4", "Noise in the fourth channel (alpha)" }
};
gimp_install_procedure ("plug_in_noisify",
"Adds random noise to a drawable's channels",
"More here later",
"Torsten Martinsen",
"Torsten Martinsen",
"May 2000",
N_("<Image>/Filters/Noise/_Noisify..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_noisify", &nvals);
/* First acquire information with a dialog */
if (! noisify_dialog (drawable, drawable->bpp))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 8)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
nvals.independent = param[3].data.d_int32 ? TRUE : FALSE;
nvals.noise[0] = param[4].data.d_float;
nvals.noise[1] = param[5].data.d_float;
nvals.noise[2] = param[6].data.d_float;
nvals.noise[3] = param[7].data.d_float;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_noisify", &nvals);
break;
default:
break;
}
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
gimp_drawable_is_gray (drawable->drawable_id))
{
gimp_progress_init (_("Adding Noise..."));
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* compute the luminosity which exceeds the luminosity threshold */
noisify (drawable, FALSE);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE) {
gimp_set_data ("plug_in_noisify", &nvals, sizeof (NoisifyVals));
}
}
else
{
/* gimp_message ("blur: cannot operate on indexed color images"); ??? BLUR ??? */
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static void
noisify_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data)
{
GRand *gr = (GRand*) data;
gint noise = 0, b;
if (!nvals.independent)
noise = (gint) (nvals.noise[0] * gauss (gr) * 127);
for (b = 0; b < bpp; b++)
{
if (nvals.noise[b] > 0.0)
{
gint p;
if (nvals.independent)
noise = (gint) (nvals.noise[b] * gauss (gr) * 127);
p = src[b] + noise;
dest[b] = CLAMP0255 (p);
}
else
{
dest[b] = src[b];
}
}
}
static void
noisify (GimpDrawable *drawable,
gboolean preview_mode)
{
GRand *gr;
gr = g_rand_new ();
if (preview_mode)
gimp_old_preview_update (preview, noisify_func, gr);
else
gimp_rgn_iterate2 (drawable, run_mode, noisify_func, gr);
g_rand_free (gr);
}
static void
noisify_add_channel (GtkWidget *table, gint channel, gchar *name,
GimpDrawable *drawable)
{
GtkObject *adj;
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, channel + 1,
name, SCALE_WIDTH, 0,
nvals.noise[channel], 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
NULL, NULL);
g_object_set_data (G_OBJECT (adj), "drawable", drawable);
g_signal_connect (adj, "value_changed",
G_CALLBACK (noisify_double_adjustment_update),
&nvals.noise[channel]);
noise_int.channel_adj[channel] = adj;
}
static gint
noisify_dialog (GimpDrawable *drawable,
gint channels)
{
GtkWidget *dlg;
GtkWidget *main_vbox;
GtkWidget *toggle;
GtkWidget *frame;
GtkWidget *table;
gboolean run;
gimp_ui_init ("noisify", FALSE);
dlg = gimp_dialog_new (_("Noisify"), "noisify",
NULL, 0,
gimp_standard_help_func, "plug-in-noisify",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
main_vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 0);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
/* preview */
preview = gimp_old_preview_new (NULL, TRUE);
gtk_box_pack_start (GTK_BOX (main_vbox), preview->frame, FALSE, FALSE, 0);
gtk_widget_show (preview->widget);
gimp_old_preview_fill (preview, drawable);
noisify (drawable, TRUE); /* preview noisify */
/* parameter settings */
frame = gtk_frame_new (_("Parameter Settings"));
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
table = gtk_table_new (channels + 1, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_table_set_row_spacing (GTK_TABLE (table), 0, 4);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
gtk_widget_show (table);
toggle = gtk_check_button_new_with_mnemonic (_("_Independent"));
gtk_table_attach (GTK_TABLE (table), toggle, 0, 3, 0, 1, GTK_FILL, 0, 0, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), nvals.independent);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&nvals.independent);
noise_int.channels = channels;
if (channels == 1)
{
noisify_add_channel (table, 0, _("_Gray:"), drawable);
}
else if (channels == 2)
{
noisify_add_channel (table, 0, _("_Gray:"), drawable);
noisify_add_channel (table, 1, _("_Alpha:"), drawable);
}
else if (channels == 3)
{
noisify_add_channel (table, 0, _("_Red:"), drawable);
noisify_add_channel (table, 1, _("_Green:"), drawable);
noisify_add_channel (table, 2, _("_Blue:"), drawable);
}
else if (channels == 4)
{
noisify_add_channel (table, 0, _("_Red:"), drawable);
noisify_add_channel (table, 1, _("_Green:"), drawable);
noisify_add_channel (table, 2, _("_Blue:"), drawable);
noisify_add_channel (table, 3, _("_Alpha:"), drawable);
}
else
{
gchar *buffer;
gint i;
for (i = 0; i < channels; i++)
{
buffer = g_strdup_printf (_("Channel #%d:"), i);
noisify_add_channel (table, i, buffer, drawable);
g_free (buffer);
}
}
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
return run;
}
/*
* Return a Gaussian (aka normal) random variable.
*
* Adapted from ppmforge.c, which is part of PBMPLUS.
* The algorithm comes from:
* 'The Science Of Fractal Images'. Peitgen, H.-O., and Saupe, D. eds.
* Springer Verlag, New York, 1988.
*
* It would probably be better to use another algorithm, such as that
* in Knuth
*/
static gdouble
gauss (GRand *gr)
{
gint i;
gdouble sum = 0.0;
for (i = 0; i < 4; i++)
sum += g_rand_int_range (gr, 0, 0x7FFF);
return sum * 5.28596089837e-5 - 3.46410161514;
}
static void
noisify_double_adjustment_update (GtkAdjustment *adjustment,
gpointer data)
{
GimpDrawable *drawable;
gimp_double_adjustment_update (adjustment, data);
drawable = g_object_get_data (G_OBJECT (adjustment), "drawable");
noisify (drawable, TRUE);
if (! nvals.independent)
{
gint i;
for (i = 0; i < noise_int.channels; i++)
if (adjustment != GTK_ADJUSTMENT (noise_int.channel_adj[i]))
gtk_adjustment_set_value (GTK_ADJUSTMENT (noise_int.channel_adj[i]),
adjustment->value);
}
}
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