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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 "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h> /* For random seeding */
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.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_ok_callback (GtkWidget *widget,
gpointer 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 (void)
{
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 gint nargs = sizeof (args) / sizeof (args[0]);
INIT_I18N();
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",
N_("<Image>/Filters/Render/Clouds/Plasma..."),
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, 0,
args, NULL);
}
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:
INIT_I18N_UI();
/* 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:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = STATUS_CALLING_ERROR;
}
else
{
pvals.seed = (gint) param[3].data.d_int32;
pvals.turbulence = (gdouble) param[4].data.d_float;
if (pvals.turbulence <= 0)
status = STATUS_CALLING_ERROR;
}
break;
case RUN_WITH_LAST_VALS:
INIT_I18N();
/* 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_is_rgb (drawable->id) || gimp_drawable_is_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 (void)
{
GtkWidget *dlg;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *seed_hbox;
GtkObject *adj;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("plasma");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gimp_dialog_new (_("Plasma"), "plasma",
gimp_plugin_help_func, "filters/plasma.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), plasma_ok_callback,
NULL, NULL, NULL, TRUE, FALSE,
_("Cancel"), gtk_widget_destroy,
NULL, 1, NULL, FALSE, TRUE,
NULL);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
GTK_SIGNAL_FUNC (gtk_main_quit),
NULL);
gimp_help_init ();
/* parameter settings */
frame = gtk_frame_new (_("Parameter Settings"));
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
table = gtk_table_new (2, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_container_set_border_width (GTK_CONTAINER (table), 4);
gtk_container_add (GTK_CONTAINER (frame), table);
seed_hbox = gimp_random_seed_new (&pvals.seed,
&pvals.timeseed,
TRUE, FALSE);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Random Seed:"), 1.0, 0.5,
seed_hbox, 1, TRUE);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Turbulence:"), SCALE_WIDTH, 0,
pvals.turbulence,
0.1, 7.0, 0.1, 1.0, 1,
TRUE, 0, 0,
NULL, NULL);
gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&pvals.turbulence);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gimp_help_free ();
gdk_flush ();
return pint.run;
}
static void
plasma_ok_callback (GtkWidget *widget,
gpointer data)
{
pint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
#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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