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

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/* Spread --- image filter plug-in for GIMP
* Copyright (C) 1997 Brian Degenhardt and Federico Mena Quintero
*
* 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/>.
*
*/
#include "config.h"
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-spread"
#define PLUG_IN_BINARY "noise-spread"
#define TILE_CACHE_SIZE 16
typedef struct
{
gdouble spread_amount_x;
gdouble spread_amount_y;
} SpreadValues;
/* 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 spread (GimpDrawable *drawable);
static void spread_preview_update (GimpPreview *preview,
GtkWidget *size);
static gboolean spread_dialog (gint32 image_ID,
GimpDrawable *drawable);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static SpreadValues spvals =
{
5, /* horizontal spread amount */
5 /* vertical spread amount */
};
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const GimpParamDef 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_FLOAT, "spread-amount-x", "Horizontal spread amount (0 <= spread_amount_x <= 200)" },
{ GIMP_PDB_FLOAT, "spread-amount-y", "Vertical spread amount (0 <= spread_amount_y <= 200)" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Move pixels around randomly"),
"Spreads the pixels of the specified drawable. "
"Pixels are randomly moved to another location whose "
"distance varies from the original by the horizontal "
"and vertical spread amounts ",
"Spencer Kimball and Peter Mattis, ported by Brian "
"Degenhardt and Federico Mena Quintero",
"Federico Mena Quintero and Brian Degenhardt",
"1997",
N_("Sp_read..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Noise");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
gint32 image_ID;
GimpDrawable *drawable;
GimpRunMode run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
run_mode = param[0].data.d_int32;
INIT_I18N ();
/* Get the specified image and drawable */
image_ID = param[1].data.d_image;
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* set the tile cache size */
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
*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:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &spvals);
/* First acquire information with a dialog */
if (! spread_dialog (image_ID, drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
spvals.spread_amount_x= param[3].data.d_float;
spvals.spread_amount_y = param[4].data.d_float;
}
if ((status == GIMP_PDB_SUCCESS) &&
(spvals.spread_amount_x < 0 || spvals.spread_amount_x > 200) &&
(spvals.spread_amount_y < 0 || spvals.spread_amount_y > 200))
status = GIMP_PDB_CALLING_ERROR;
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &spvals);
break;
default:
break;
}
if (status == GIMP_PDB_SUCCESS)
{
/* 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 (_("Spreading"));
/* run the spread effect */
spread (drawable);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &spvals, sizeof (SpreadValues));
}
else
{
/* gimp_message ("spread: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
typedef struct
{
GimpPixelFetcher *pft;
GRand *gr;
gint x_amount;
gint y_amount;
gint width;
gint height;
} SpreadParam_t;
/* Spread the image. This is done by going through every pixel
in the source image and swapping it with some other random
pixel. The random pixel is located within an ellipse that is
as high as the spread_amount_y parameter and as wide as the
spread_amount_x parameter. This is done by randomly selecting
an angle and then multiplying the sine of the angle to a random
number whose range is between -spread_amount_x/2 and spread_amount_x/2.
The y coordinate is found by multiplying the cosine of the angle
to the random value generated from spread_amount_y. The reason
that the spread is done this way is to make the end product more
random looking. To see a result of this, compare spreading a
square with gimp 0.54 to spreading a square with this filter.
The corners are less sharp with this algorithm.
*/
static void
spread_func (gint x,
gint y,
guchar *dest,
gint bpp,
gpointer data)
{
SpreadParam_t *param = (SpreadParam_t*) data;
gdouble angle;
gint xdist, ydist;
gint xi, yi;
/* get random angle, x distance, and y distance */
xdist = (param->x_amount > 0
? g_rand_int_range (param->gr, -param->x_amount, param->x_amount)
: 0);
ydist = (param->y_amount > 0
? g_rand_int_range (param->gr, -param->y_amount, param->y_amount)
: 0);
angle = g_rand_double_range (param->gr, -G_PI, G_PI);
xi = x + floor (sin (angle) * xdist);
yi = y + floor (cos (angle) * ydist);
/* Only displace the pixel if it's within the bounds of the image. */
if (xi >= 0 && xi < param->width && yi >= 0 && yi < param->height)
{
gimp_pixel_fetcher_get_pixel (param->pft, xi, yi, dest);
}
else /* Else just copy it */
{
gimp_pixel_fetcher_get_pixel (param->pft, x, y, dest);
}
}
static void
spread (GimpDrawable *drawable)
{
GimpRgnIterator *iter;
SpreadParam_t param;
param.pft = gimp_pixel_fetcher_new (drawable, FALSE);
param.gr = g_rand_new ();
param.x_amount = (spvals.spread_amount_x + 1) / 2;
param.y_amount = (spvals.spread_amount_y + 1) / 2;
param.width = drawable->width;
param.height = drawable->height;
gimp_pixel_fetcher_set_edge_mode(param.pft, GIMP_PIXEL_FETCHER_EDGE_BLACK);
iter = gimp_rgn_iterator_new (drawable, 0);
gimp_rgn_iterator_dest (iter, spread_func, &param);
gimp_rgn_iterator_free (iter);
g_rand_free (param.gr);
}
static void
spread_preview_update (GimpPreview *preview,
GtkWidget *size)
{
GimpDrawable *drawable;
SpreadParam_t param;
gint x, y, bpp;
guchar *buffer, *dest;
gint x_off, y_off;
gint width, height;
drawable =
gimp_drawable_preview_get_drawable (GIMP_DRAWABLE_PREVIEW (preview));
param.pft = gimp_pixel_fetcher_new (drawable, FALSE);
param.gr = g_rand_new ();
param.x_amount = (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (size),
0) + 1) / 2;
param.y_amount = (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (size),
1) + 1) / 2;
param.width = drawable->width;
param.height = drawable->height;
gimp_pixel_fetcher_set_edge_mode(param.pft, GIMP_PIXEL_FETCHER_EDGE_BLACK);
gimp_preview_get_size (preview, &width, &height);
bpp = drawable->bpp;
dest = buffer = g_new (guchar, width * height * bpp);
gimp_preview_get_position (preview, &x_off, &y_off);
for (y = 0 ; y < height ; y++)
for (x = 0 ; x < width ; x++)
{
spread_func (x + x_off, y + y_off, dest, bpp, &param);
dest += bpp;
}
gimp_preview_draw_buffer (preview, buffer, width * bpp);
g_free (buffer);
g_rand_free (param.gr);
}
static gboolean
spread_dialog (gint32 image_ID,
GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *frame;
GtkWidget *size;
GimpUnit unit;
gdouble xres;
gdouble yres;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Spread"), 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_get_content_area (GTK_DIALOG (dialog))),
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);
frame = gimp_frame_new (_("Spread Amount"));
gtk_box_pack_start (GTK_BOX (main_vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
/* Get the image resolution and unit */
gimp_image_get_resolution (image_ID, &xres, &yres);
unit = gimp_image_get_unit (image_ID);
/* sizeentries */
size = gimp_coordinates_new (unit, "%a", TRUE, FALSE, -1,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
spvals.spread_amount_x == spvals.spread_amount_y,
FALSE,
_("_Horizontal:"), spvals.spread_amount_x, xres,
0, MAX (drawable->width, drawable->height),
0, 0,
_("_Vertical:"), spvals.spread_amount_y, yres,
0, MAX (drawable->width, drawable->height),
0, 0);
gtk_container_add (GTK_CONTAINER (frame), size);
gtk_widget_show (size);
g_signal_connect (preview, "invalidated",
G_CALLBACK (spread_preview_update),
size);
g_signal_connect_swapped (size, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
spread_preview_update (GIMP_PREVIEW (preview), size);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
if (run)
{
spvals.spread_amount_x =
gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (size), 0);
spvals.spread_amount_y =
gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (size), 1);
}
gtk_widget_destroy (dialog);
return run;
}
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