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gimp/plug-ins/common/noise-rgb.c

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/*
* This is a plugin for 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define RGB_NOISE_PROC "plug-in-rgb-noise"
#define NOISIFY_PROC "plug-in-noisify"
#define PLUG_IN_BINARY "noise-rgb"
#define PLUG_IN_ROLE "gimp-noise-rgb"
#define SCALE_WIDTH 125
#define TILE_CACHE_SIZE 16
typedef struct
{
gboolean independent;
gboolean correlated ;
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_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data);
static void noisify (GimpPreview *preview);
static gdouble gauss (GRand *gr);
static gboolean noisify_dialog (GimpDrawable *drawable,
gint channels);
static void noisify_double_adjustment_update (GtkAdjustment *adjustment,
gpointer data);
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static NoisifyVals nvals =
{
TRUE,
FALSE,
{ 0.20, 0.20, 0.20, 0.0 }
};
static NoisifyInterface noise_int =
{
0,
{ NULL, NULL, NULL, NULL }
};
static GRand *noise_gr ; /* Global random number object */
MAIN ()
static void
query (void)
{
static const GimpParamDef scatter_args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ GIMP_PDB_IMAGE, "image", "Input image (unused)" },
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
{ GIMP_PDB_INT32, "independent", "Noise in channels independent" },
{ GIMP_PDB_INT32, "correlated", "Noise correlated (i.e. multiplicative not additive)" },
{ 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)" }
};
static const GimpParamDef noisify_args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ 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 (RGB_NOISE_PROC,
N_("Distort colors by random amounts"),
"Add normally distributed (zero mean) random values "
"to image channels. Noise may be additive "
"(uncorrelated) or multiplicative (correlated - "
"also known as speckle noise). "
"For color images color channels may be treated "
"together or independently.",
"Torsten Martinsen",
"Torsten Martinsen",
"May 2000",
N_("_RGB Noise..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (scatter_args), 0,
scatter_args, NULL);
gimp_plugin_menu_register (RGB_NOISE_PROC, "<Image>/Filters/Noise");
gimp_install_procedure (NOISIFY_PROC,
"Adds random noise to image channels ",
"Add normally distributed random values to "
"image channels. For color images each "
"color channel may be treated together or "
"independently.",
"Torsten Martinsen",
"Torsten Martinsen",
"May 2000",
NULL,
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (noisify_args), 0,
noisify_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;
GimpRunMode run_mode;
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;
noise_gr = g_rand_new ();
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
if (gimp_drawable_is_gray (drawable->drawable_id))
nvals.noise[1] = 0.0;
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (RGB_NOISE_PROC, &nvals);
/* First acquire information with a dialog */
if (! noisify_dialog (drawable, drawable->bpp))
{
gimp_drawable_detach (drawable);
g_rand_free (noise_gr);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
if (strcmp (name, NOISIFY_PROC) == 0)
{
/* 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.correlated = 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;
}
}
else if (strcmp (name, RGB_NOISE_PROC) == 0)
{
if (nparams != 9)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
nvals.independent =
param[3].data.d_int32 ? TRUE : FALSE;
nvals.correlated =
param[4].data.d_int32 ? TRUE : FALSE;
nvals.noise[0] = param[5].data.d_float;
nvals.noise[1] = param[6].data.d_float;
nvals.noise[2] = param[7].data.d_float;
nvals.noise[3] = param[8].data.d_float;
}
}
else
{
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (RGB_NOISE_PROC, &nvals);
break;
default:
break;
}
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_is_indexed (drawable->drawable_id))
status = GIMP_PDB_EXECUTION_ERROR;
if (status == GIMP_PDB_SUCCESS)
{
gimp_progress_init (_("Adding noise"));
/* compute the luminosity which exceeds the luminosity threshold */
gimp_rgn_iterate2 (drawable, 0 /* unused */, noisify_func, noise_gr);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (RGB_NOISE_PROC, &nvals, sizeof (NoisifyVals));
}
else
{
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
g_rand_free (noise_gr);
}
static void
noisify_func (const guchar *src,
guchar *dest,
gint bpp,
gpointer data)
{
GRand *gr = data;
gdouble noise = 0;
gint b;
for (b = 0; b < bpp; b++)
{
if (b == 0 || nvals.independent ||
(b == 1 && bpp == 2) || (b == 3 && bpp == 4))
noise = nvals.noise[b] * gauss (gr) * 127;
if (nvals.noise[b] > 0.0)
{
gint p;
if (nvals.correlated)
{
p = (gint) (src[b] + (src[b] * (noise / 127.0)) + 0.5);
}
else
{
p = (gint) (src[b] + noise + 0.5);
}
dest[b] = CLAMP0255 (p);
}
else
{
dest[b] = src[b];
}
}
}
static void
noisify (GimpPreview *preview)
{
GimpDrawable *drawable;
GimpPixelRgn src_rgn;
guchar *src, *dst;
gint i;
gint x1, y1;
gint width, height;
gint bpp;
GRand *gr = g_rand_copy (noise_gr);
drawable =
gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));
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++)
noisify_func (src + i * bpp, dst + i * bpp, bpp, gr);
gimp_preview_draw_buffer (preview, dst, width * bpp);
g_free (src);
g_free (dst);
g_rand_free (gr);
}
static void
noisify_add_channel (GtkWidget *table,
gint channel,
const gchar *name,
GimpDrawable *drawable,
GtkWidget *preview)
{
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]);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
noise_int.channel_adj[channel] = adj;
}
static void
noisify_add_alpha_channel (GtkWidget *table,
gint channel,
const gchar *name,
GimpDrawable *drawable,
GtkWidget *preview)
{
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 (gimp_double_adjustment_update),
&nvals.noise[channel]);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
noise_int.channel_adj[channel] = adj;
}
static gboolean
noisify_dialog (GimpDrawable *drawable,
gint channels)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *vbox;
GtkWidget *preview;
GtkWidget *toggle;
GtkWidget *table;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("RGB Noise"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, RGB_NOISE_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_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new (drawable, NULL);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, FALSE, FALSE, 0);
gtk_widget_show (preview);
g_signal_connect (preview, "invalidated",
G_CALLBACK (noisify),
NULL);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
gtk_box_pack_start (GTK_BOX (main_vbox), vbox, FALSE, FALSE, 0);
gtk_widget_show (vbox);
toggle = gtk_check_button_new_with_mnemonic (_("Co_rrelated noise"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
nvals.correlated);
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&nvals.correlated);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
if (gimp_drawable_is_rgb (drawable->drawable_id))
{
toggle = gtk_check_button_new_with_mnemonic (_("_Independent RGB"));
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
nvals.independent);
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&nvals.independent);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
}
table = gtk_table_new (channels, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), table, TRUE, TRUE, 0);
gtk_widget_show (table);
noise_int.channels = channels;
if (channels == 1)
{
noisify_add_channel (table, 0, _("_Gray:"), drawable, preview);
}
else if (channels == 2)
{
noisify_add_channel (table, 0, _("_Gray:"), drawable, preview);
noisify_add_alpha_channel (table, 1, _("_Alpha:"), drawable, preview);
gtk_table_set_row_spacing (GTK_TABLE (table), 1, 15);
}
else if (channels == 3)
{
noisify_add_channel (table, 0, _("_Red:"), drawable, preview);
noisify_add_channel (table, 1, _("_Green:"), drawable, preview);
noisify_add_channel (table, 2, _("_Blue:"), drawable, preview);
}
else if (channels == 4)
{
noisify_add_channel (table, 0, _("_Red:"), drawable, preview);
noisify_add_channel (table, 1, _("_Green:"), drawable, preview);
noisify_add_channel (table, 2, _("_Blue:"), drawable, preview);
noisify_add_alpha_channel (table, 3, _("_Alpha:"), drawable, preview);
gtk_table_set_row_spacing (GTK_TABLE (table), 3, 15);
}
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, preview);
g_free (buffer);
}
}
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
/*
* Return a Gaussian (aka normal) distributed random variable.
*
* Adapted from gauss.c included in GNU scientific library.
*
* Ratio method (Kinderman-Monahan); see Knuth v2, 3rd ed, p130
* K+M, ACM Trans Math Software 3 (1977) 257-260.
*/
static gdouble
gauss (GRand *gr)
{
gdouble u, v, x;
do
{
v = g_rand_double (gr);
do
u = g_rand_double (gr);
while (u == 0);
/* Const 1.715... = sqrt(8/e) */
x = 1.71552776992141359295 * (v - 0.5) / u;
}
while (x * x > -4.0 * log (u));
return x;
}
static void
noisify_double_adjustment_update (GtkAdjustment *adjustment,
gpointer data)
{
gint n;
gimp_double_adjustment_update (adjustment, data);
if (! nvals.independent)
{
gint i;
switch (noise_int.channels)
{
case 1: n = 1; break;
case 2: n = 1; break;
case 3: n = 3; break;
default: n = 3; break;
}
for (i = 0; i < n; i++)
if (adjustment != GTK_ADJUSTMENT (noise_int.channel_adj[i]))
gtk_adjustment_set_value (GTK_ADJUSTMENT (noise_int.channel_adj[i]),
gtk_adjustment_get_value (adjustment));
}
}
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