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gimp/plug-ins/common/plasma.c

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/*
* This is a plugin for the GIMP.
*
* Copyright (C) 1996 Stephen Norris
*
* 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.
*
*/
/*
* This plug-in produces plasma fractal images. The algorithm is losely
* based on a description of the fractint algorithm, but completely
* re-implemented because the fractint code was too ugly to read :)
*
* Please send any patches or suggestions to me: srn@flibble.cs.su.oz.au.
*/
/*
* TODO:
* - The progress bar sucks.
* - It writes some pixels more than once.
*/
/* Version 1.01 */
/*
* Ported to GIMP Plug-in API 1.0
* by Eiichi Takamori <taka@ma1.seikyou.ne.jp>
*
* $Id$
*
* A few functions names and their order are changed :)
* Plasma implementation almost hasn't been changed.
*
* Feel free to correct my WRONG English, or to modify Plug-in Path,
* and so on. ;-)
*/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h> /* For random seeding */
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
#include "libgimp/gimpui.h"
/* Some useful macros */
#define ENTRY_WIDTH 75
#define SCALE_WIDTH 128
#define TILE_CACHE_SIZE 32
typedef struct {
gint seed;
gdouble turbulence;
/* Interface only */
gboolean timeseed;
} PlasmaValues;
typedef struct {
gint run;
} PlasmaInterface;
/*
* Function prototypes.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals);
static gint plasma_dialog (void);
static void plasma_close_callback (GtkWidget *widget,
gpointer data);
static void plasma_ok_callback (GtkWidget *widget,
gpointer data);
static void plasma_entry_callback (GtkWidget *widget,
gpointer data);
static void plasma_scale_update (GtkAdjustment *adjustment,
gpointer data);
static void toggle_callback (GtkWidget *widget, gboolean *data);
static void plasma (GDrawable *drawable);
static void random_rgb (guchar *d);
static void add_random (guchar *d, gint amnt);
static void init_plasma (GDrawable *drawable);
static void provide_tile (GDrawable *drawable, gint col, gint row );
static void end_plasma (GDrawable *drawable);
static void get_pixel (GDrawable *drawable, gint x, gint y, guchar *pixel );
static void put_pixel (GDrawable *drawable, gint x, gint y, guchar *pixel );
static gint do_plasma (GDrawable *drawable, gint x1, gint y1,
gint x2, gint y2, gint depth, gint scale_depth );
/***** Local vars *****/
GPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static PlasmaValues pvals =
{
0, /* seed */
1.0, /* turbulence */
TRUE /* Time seed? */
};
static PlasmaInterface pint =
{
FALSE /* run */
};
/***** Functions *****/
MAIN ()
static void
query()
{
static GParamDef args[]=
{
{ PARAM_INT32, "run_mode", "Interactive, non-interactive" },
{ PARAM_IMAGE, "image", "Input image (unused)" },
{ PARAM_DRAWABLE, "drawable", "Input drawable" },
{ PARAM_INT32, "seed", "Random seed" },
{ PARAM_FLOAT, "turbulence", "Turbulence of plasma" }
};
static GParamDef *return_vals = NULL;
static gint nargs = sizeof (args) / sizeof (args[0]);
static gint nreturn_vals = 0;
gimp_install_procedure ("plug_in_plasma",
"Create a plasma cloud like image to the specified drawable",
"More help",
"Stephen Norris & (ported to 1.0 by) Eiichi Takamori",
"Stephen Norris",
"1995",
"<Image>/Filters/Render/Plasma",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run (gchar *name,
gint nparams,
GParam *param,
gint *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
switch (run_mode)
{
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_plasma", &pvals);
/* First acquire information with a dialog */
if (! plasma_dialog ())
{
gimp_drawable_detach (drawable);
return;
}
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
pvals.seed = (gint) param[3].data.d_int32;
pvals.turbulence = (gdouble) param[4].data.d_float;
}
if ((status == STATUS_SUCCESS) &&
pvals.turbulence <= 0 )
status = STATUS_CALLING_ERROR;
break;
case RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data ("plug_in_plasma", &pvals);
break;
default:
break;
}
if (status == STATUS_SUCCESS)
{
/* Make sure that the drawable is gray or RGB color */
if (gimp_drawable_color (drawable->id) || gimp_drawable_gray (drawable->id))
{
gimp_progress_init ("Plasma...");
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
plasma (drawable);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == RUN_INTERACTIVE ||
(pvals.timeseed && run_mode == RUN_WITH_LAST_VALS))
gimp_set_data ("plug_in_plasma", &pvals, sizeof (PlasmaValues));
}
else
{
/* gimp_message ("plasma: cannot operate on indexed color images"); */
status = STATUS_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gint
plasma_dialog()
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *button;
GtkWidget *label;
GtkWidget *entry;
GtkWidget *seed_hbox;
GtkWidget *time_button;
GtkWidget *scale;
GtkObject *scale_data;
gchar **argv;
gint argc;
guchar buffer[32];
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("plasma");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), "Plasma");
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) plasma_close_callback,
NULL);
/* Action area */
button = gtk_button_new_with_label ("OK");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) plasma_ok_callback,
dlg);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_grab_default (button);
gtk_widget_show (button);
button = gtk_button_new_with_label ("Cancel");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
(GtkSignalFunc) gtk_widget_destroy,
GTK_OBJECT (dlg));
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->action_area), button, TRUE, TRUE, 0);
gtk_widget_show (button);
/* parameter settings */
frame = gtk_frame_new ("Plasma Options");
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_border_width (GTK_CONTAINER (frame), 10);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new (2, 2, FALSE);
gtk_container_border_width (GTK_CONTAINER (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
label = gtk_label_new ("Seed");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1, GTK_FILL, 0, 5, 0 );
gtk_widget_show (label);
seed_hbox = gtk_hbox_new(FALSE, 2);
gtk_table_attach (GTK_TABLE (table), seed_hbox, 1, 2, 0, 1,
GTK_FILL, GTK_FILL, 0, 0 );
gtk_widget_show (seed_hbox);
entry = gtk_entry_new ();
gtk_box_pack_start(GTK_BOX(seed_hbox), entry, TRUE, TRUE, 0);
gtk_widget_set_usize( entry, ENTRY_WIDTH, 0 );
sprintf( (char *)buffer, "%d", pvals.seed );
gtk_entry_set_text (GTK_ENTRY (entry), (gchar *)buffer );
gtk_signal_connect (GTK_OBJECT (entry), "changed",
(GtkSignalFunc) plasma_entry_callback,
&pvals.seed);
gtk_widget_show (entry);
time_button = gtk_toggle_button_new_with_label ("Time");
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(time_button),pvals.timeseed);
gtk_signal_connect (GTK_OBJECT (time_button), "clicked",
(GtkSignalFunc) toggle_callback,
&pvals.timeseed);
gtk_box_pack_end (GTK_BOX (seed_hbox), time_button, FALSE, FALSE, 0);
gtk_widget_show (time_button);
gtk_widget_show (seed_hbox);
label = gtk_label_new ("Turbulence");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2, GTK_FILL, 0, 5, 0);
gtk_widget_show (label);
scale_data = gtk_adjustment_new (pvals.turbulence, 0.1, 7.0, 0.1, 0.1, 0.0);
scale = gtk_hscale_new (GTK_ADJUSTMENT (scale_data));
gtk_widget_set_usize (scale, SCALE_WIDTH, 0);
gtk_table_attach (GTK_TABLE (table), scale, 1, 2, 1, 2, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_scale_set_digits (GTK_SCALE (scale), 1);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) plasma_scale_update,
&pvals.turbulence);
gtk_widget_show (scale);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return pint.run;
}
/* Plasma interface functions */
static void
plasma_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
plasma_ok_callback (GtkWidget *widget,
gpointer data)
{
pint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
plasma_entry_callback (GtkWidget *widget,
gpointer data)
{
gint *text_val;
text_val = (gint *) data;
*text_val = atoi (gtk_entry_get_text (GTK_ENTRY (widget)));
}
static void
plasma_scale_update (GtkAdjustment *adjustment,
gpointer data)
{
gdouble *dptr = (gdouble*) data;
*dptr = adjustment->value;
}
static void
toggle_callback (GtkWidget *widget, gboolean *data)
{
*data = GTK_TOGGLE_BUTTON (widget)->active;
}
#define AVE(n, v1, v2) n[0] = ((gint)v1[0] + (gint)v2[0]) / 2;\
n[1] = ((gint)v1[1] + (gint)v2[1]) / 2;\
n[2] = ((gint)v1[2] + (gint)v2[2]) / 2;
/*
* Some glabals to save passing too many paramaters that don't change.
*/
gint ix1, iy1, ix2, iy2; /* Selected image size. */
GTile *tile=NULL;
gint tile_row, tile_col;
gint tile_width, tile_height;
gint tile_dirty;
gint bpp, has_alpha, alpha;
gdouble turbulence;
glong max_progress, progress;
/*
* The setup function.
*/
static void
plasma(GDrawable *drawable)
{
gint depth;
init_plasma(drawable);
/*
* This first time only puts in the seed pixels - one in each
* corner, and one in the center of each edge, plus one in the
* center of the image.
*/
do_plasma( drawable, ix1, iy1, ix2 - 1, iy2 - 1, -1, 0);
/*
* Now we recurse through the images, going further each time.
*/
depth = 1;
while (!do_plasma( drawable, ix1, iy1, ix2 - 1, iy2 - 1, depth, 0)){
depth ++;
}
end_plasma( drawable );
}
static void
init_plasma( GDrawable *drawable )
{
if (pvals.timeseed)
pvals.seed = time(NULL);
srand( pvals.seed );
turbulence = pvals.turbulence;
gimp_drawable_mask_bounds(drawable->id, &ix1, &iy1, &ix2, &iy2);
max_progress = (ix2 - ix1) * (iy2 - iy1);
progress = 0;
tile_width = gimp_tile_width ();
tile_height = gimp_tile_height ();
tile = NULL;
tile_row = 0; tile_col = 0;
bpp = drawable->bpp;
has_alpha = gimp_drawable_has_alpha( drawable->id );
if( has_alpha )
alpha = bpp-1;
else
alpha = bpp;
}
static void
provide_tile( GDrawable *drawable, gint col, gint row )
{
if ( col != tile_col || row != tile_row || !tile )
{
if( tile )
gimp_tile_unref( tile, tile_dirty );
tile_col = col;
tile_row = row;
tile = gimp_drawable_get_tile( drawable, TRUE, tile_row, tile_col );
tile_dirty = FALSE;
gimp_tile_ref( tile );
}
}
static void
end_plasma( GDrawable *drawable )
{
if( tile )
gimp_tile_unref( tile, tile_dirty );
tile=NULL;
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, ix1, iy1, (ix2 - ix1), (iy2 - iy1));
}
static void
get_pixel( GDrawable *drawable, gint x, gint y, guchar *pixel )
{
gint row, col;
gint offx, offy, i;
guchar *ptr;
if (x < ix1) x = ix1;
if (x > ix2 - 1) x = ix2 - 1;
if (y < iy1) y = iy1;
if (y > iy2 - 1) y = iy2 - 1;
col = x / tile_width;
row = y / tile_height;
offx = x % tile_width;
offy = y % tile_height;
provide_tile( drawable, col, row );
ptr = tile->data + ( offy * tile->ewidth + offx ) * bpp;
for( i = 0; i < alpha; i++ )
pixel[i] = ptr[i];
}
static void
put_pixel( GDrawable *drawable, gint x, gint y, guchar *pixel )
{
gint row, col;
gint offx, offy, i;
guchar *ptr;
if (x < ix1) x = ix1;
if (x > ix2 - 1) x = ix2 - 1;
if (y < iy1) y = iy1;
if (y > iy2 - 1) y = iy2 - 1;
col = x / tile_width;
row = y / tile_height;
offx = x % tile_width;
offy = y % tile_height;
provide_tile( drawable, col, row );
ptr = tile->data + ( offy * tile->ewidth + offx ) * bpp;
for( i = 0; i < alpha; i++ )
ptr[i] = pixel[i];
if( has_alpha )
ptr[alpha] = 255;
tile_dirty = TRUE;
progress++;
}
static void
random_rgb(guchar *d)
{
gint i;
for( i = 0; i < alpha; i++ ) {
d[i] = rand() % 256;
}
}
static void
add_random(guchar *d, gint amnt)
{
gint i, tmp;
for (i = 0; i < alpha; i++){
if (amnt == 0){
amnt = 1;
}
tmp = amnt/2 - rand() % amnt;
if ((gint)d[i] + tmp < 0){
d[i] = 0;
} else if ((gint)d[i] + tmp > 255){
d[i] = 255;
} else {
d[i] += tmp;
}
}
}
static gint
do_plasma( GDrawable *drawable, gint x1, gint y1, gint x2, gint y2,
gint depth, gint scale_depth)
{
guchar tl[3], ml[3], bl[3], mt[3], mm[3], mb[3], tr[3], mr[3], br[3];
guchar tmp[3];
gint ran;
gint xm, ym;
static gint count = 0;
/* Initial pass through - no averaging. */
if (depth == -1){
random_rgb(tl);
put_pixel( drawable, x1, y1, tl);
random_rgb(tr);
put_pixel( drawable, x2, y1, tr);
random_rgb(bl);
put_pixel( drawable, x1, y2, bl);
random_rgb(br);
put_pixel( drawable, x2, y2, br);
random_rgb(mm);
put_pixel( drawable, (x1 + x2) / 2, (y1 + y2) / 2, mm);
random_rgb(ml);
put_pixel( drawable, x1, (y1 + y2) / 2, ml);
random_rgb(mr);
put_pixel( drawable, x2, (y1 + y2) / 2, mr);
random_rgb(mt);
put_pixel( drawable, (x1 + x2) / 2, y1, mt);
random_rgb(ml);
put_pixel( drawable, (x1 + x2) / 2, y2, ml);
return 0;
}
/*
* Some later pass, at the bottom of this pass,
* with averaging at this depth.
*/
if (depth == 0){
gdouble rnd;
gint xave, yave;
get_pixel( drawable, x1, y1, tl);
get_pixel( drawable, x1, y2, bl);
get_pixel( drawable, x2, y1, tr);
get_pixel( drawable, x2, y2, br);
rnd = (256.0 / (2.0 * (gdouble)scale_depth)) * turbulence;
ran = rnd;
xave = (x1 + x2) / 2;
yave = (y1 + y2) / 2;
if (xave == x1 && xave == x2 && yave == y1 && yave == y2){
return 0;
}
if (xave != x1 || xave != x2){
/* Left. */
AVE(ml, tl, bl);
add_random(ml, ran);
put_pixel( drawable, x1, yave, ml);
if (x1 != x2){
/* Right. */
AVE(mr, tr, br);
add_random(mr, ran);
put_pixel( drawable, x2, yave, mr);
}
}
if (yave != y1 || yave != y2){
if (x1 != xave || yave != y2){
/* Bottom. */
AVE(mb, bl, br);
add_random(mb, ran);
put_pixel( drawable, xave, y2, mb);
}
if (y1 != y2){
/* Top. */
AVE(mt, tl, tr);
add_random(mt, ran);
put_pixel( drawable, xave, y1, mt);
}
}
if (y1 != y2 || x1 != x2){
/* Middle pixel. */
AVE(mm, tl, br);
AVE(tmp, bl, tr);
AVE(mm, mm, tmp);
add_random(mm, ran);
put_pixel( drawable, xave, yave, mm);
}
count ++;
if (!(count % 2000)){
gimp_progress_update( (double) progress / (double) max_progress);
}
if ((x2 - x1) < 3 && (y2 - y1) < 3){
return 1;
}
return 0;
}
xm = (x1 + x2) >> 1;
ym = (y1 + y2) >> 1;
/* Top left. */
do_plasma( drawable, x1, y1, xm, ym, depth - 1, scale_depth + 1);
/* Bottom left. */
do_plasma( drawable, x1, ym, xm ,y2, depth - 1, scale_depth + 1);
/* Top right. */
do_plasma( drawable, xm, y1, x2 , ym, depth - 1, scale_depth + 1);
/* Bottom right. */
return do_plasma( drawable, xm, ym, x2, y2, depth - 1, scale_depth + 1);
}
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