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gimp/plug-ins/common/plasma.c

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/*
* This is a plugin for 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. ;-)
*
* Version 1.02
*
* May 2000
* tim copperfield [timecop@japan.co.jp]
* Added dynamic preview mode.
*
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
/* Some useful macros */
#define PLUG_IN_PROC "plug-in-plasma"
#define PLUG_IN_BINARY "plasma"
#define SCALE_WIDTH 48
#define TILE_CACHE_SIZE 32
typedef struct
{
guint32 seed;
gdouble turbulence;
gboolean random_seed;
} PlasmaValues;
/*
* Function prototypes.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean plasma_dialog (GimpDrawable *drawable);
static void plasma_seed_changed_callback (GimpDrawable *drawable,
gpointer data);
static void plasma (GimpDrawable *drawable,
gboolean preview_mode);
static void random_rgb (GRand *gr,
guchar *pixel);
static void add_random (GRand *gr,
guchar *pixel,
gint amount);
static GimpPixelFetcher *init_plasma (GimpDrawable *drawable,
gboolean preview_mode,
GRand *gr);
static void end_plasma (GimpDrawable *drawable,
GimpPixelFetcher *pft,
GRand *gr);
static void get_pixel (GimpPixelFetcher *pft,
gint x,
gint y,
guchar *pixel);
static void put_pixel (GimpPixelFetcher *pft,
gint x,
gint y,
guchar *pixel);
static gboolean do_plasma (GimpPixelFetcher *pft,
gint x1,
gint y1,
gint x2,
gint y2,
gint depth,
gint scale_depth,
GRand *gr);
/***** Local vars *****/
const GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static PlasmaValues pvals =
{
0, /* seed */
1.0, /* turbulence */
FALSE /* Use random seed */
};
/*
* Some globals to save passing too many paramaters that don't change.
*/
static GtkWidget *preview;
static guchar *preview_buffer;
static gint preview_width, preview_height;
static gint ix1, iy1, ix2, iy2; /* Selected image size. */
static gint bpp, alpha;
static gboolean has_alpha;
static glong max_progress, progress;
/***** Functions *****/
MAIN ()
static void
query (void)
{
static const 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, "seed", "Random seed" },
{ GIMP_PDB_FLOAT, "turbulence", "Turbulence of plasma" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Create a random plasma texture"),
"More help",
"Stephen Norris & (ported to 1.0 by) Eiichi Takamori",
"Stephen Norris",
"May 2000",
N_("_Plasma..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Render/Clouds");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunMode run_mode;
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_PROC, &pvals);
/* First acquire information with a dialog */
if (! plasma_dialog (drawable))
{
gimp_drawable_detach (drawable);
return;
}
break;
case GIMP_RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 5)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
pvals.seed = (guint32) param[3].data.d_int32;
pvals.turbulence = (gdouble) param[4].data.d_float;
if (pvals.turbulence <= 0)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &pvals);
if (pvals.random_seed)
pvals.seed = g_random_int ();
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 (_("Plasma"));
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
plasma (drawable, FALSE);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store data */
if (run_mode == GIMP_RUN_INTERACTIVE ||
(run_mode == GIMP_RUN_WITH_LAST_VALS))
gimp_set_data (PLUG_IN_PROC, &pvals, sizeof (PlasmaValues));
}
else
{
/* gimp_message ("plasma: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gboolean
plasma_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *label;
GtkWidget *table;
GtkWidget *seed;
GtkObject *adj;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, TRUE);
dialog = gimp_dialog_new (_("Plasma"), 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 (dialog)->vbox), main_vbox);
gtk_widget_show (main_vbox);
preview = gimp_aspect_preview_new (drawable, NULL);
gtk_box_pack_start_defaults (GTK_BOX (main_vbox), preview);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (plasma_seed_changed_callback),
drawable);
table = gtk_table_new (2, 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, FALSE, FALSE, 0);
gtk_widget_show (table);
seed = gimp_random_seed_new (&pvals.seed, &pvals.random_seed);
label = gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Random _seed:"), 0.0, 0.5,
seed, 2, TRUE);
gtk_label_set_mnemonic_widget (GTK_LABEL (label),
GIMP_RANDOM_SEED_SPINBUTTON (seed));
g_signal_connect_swapped (GIMP_RANDOM_SEED_SPINBUTTON_ADJ (seed),
"value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("T_urbulence:"), SCALE_WIDTH, 0,
pvals.turbulence,
0.1, 7.0, 0.1, 1.0, 1,
TRUE, 0, 0,
NULL, NULL);
g_signal_connect (adj, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&pvals.turbulence);
g_signal_connect_swapped (adj, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_widget_show (dialog);
run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dialog);
return run;
}
static void
plasma_seed_changed_callback (GimpDrawable *drawable,
gpointer data)
{
plasma (drawable, TRUE);
}
/*
* The setup function.
*/
static void
plasma (GimpDrawable *drawable,
gboolean preview_mode)
{
GimpPixelFetcher *pft;
gint depth;
GRand *gr;
gr = g_rand_new ();
pft = init_plasma (drawable, preview_mode, gr);
if (ix1 != ix2 && iy1 != iy2)
{
/*
* 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 (pft, ix1, iy1, ix2 - 1, iy2 - 1, -1, 0, gr);
/*
* Now we recurse through the images, going further each time.
*/
depth = 1;
while (!do_plasma (pft, ix1, iy1, ix2 - 1, iy2 - 1, depth, 0, gr))
{
depth++;
}
}
end_plasma (drawable, pft, gr);
}
static GimpPixelFetcher*
init_plasma (GimpDrawable *drawable,
gboolean preview_mode,
GRand *gr)
{
GimpPixelFetcher *pft;
g_rand_set_seed (gr, pvals.seed);
if (preview_mode)
{
ix1 = iy1 = 0;
gimp_preview_get_size (GIMP_PREVIEW (preview),
&preview_width, &preview_height);
ix2 = preview_width;
iy2 = preview_height;
preview_buffer = g_new (guchar, ix2 * iy2 * drawable->bpp);
pft = NULL;
}
else
{
gimp_drawable_mask_bounds (drawable->drawable_id,
&ix1, &iy1, &ix2, &iy2);
pft = gimp_pixel_fetcher_new (drawable, TRUE);
}
bpp = drawable->bpp;
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
alpha = (has_alpha) ? bpp - 1 : bpp;
progress = 0;
max_progress = (ix2 - ix1) * (iy2 - iy1);
return pft;
}
static void
end_plasma (GimpDrawable *drawable,
GimpPixelFetcher *pft,
GRand *gr)
{
if (pft)
{
gimp_pixel_fetcher_destroy (pft);
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id,
ix1, iy1, ix2 - ix1, iy2 - iy1);
}
else
{
gimp_preview_draw_buffer (GIMP_PREVIEW (preview),
preview_buffer, preview_width * bpp);
g_free (preview_buffer);
}
g_rand_free (gr);
}
static void
get_pixel (GimpPixelFetcher *pft,
gint x,
gint y,
guchar *pixel)
{
if (pft)
{
gimp_pixel_fetcher_get_pixel (pft, x, y, pixel);
}
else
{
memcpy (pixel, preview_buffer + (y * preview_width + x) * bpp, bpp);
}
}
static void
put_pixel (GimpPixelFetcher *pft,
gint x,
gint y,
guchar *pixel)
{
if (pft)
{
gimp_pixel_fetcher_put_pixel (pft, x, y, pixel);
progress++;
}
else
{
memcpy (preview_buffer + (y * preview_width + x) * bpp, pixel, bpp);
}
}
static void
average_pixel (guchar *dest,
const guchar *src1,
const guchar *src2,
gint bpp)
{
for (; bpp; bpp--)
{
*dest++ = (*src1++ + *src2++) / 2;
}
}
static void
random_rgb (GRand *gr,
guchar *pixel)
{
gint i;
for (i = 0; i < alpha; i++)
pixel[i] = g_rand_int_range (gr, 0, 256);
if (has_alpha)
pixel[alpha] = 255;
}
static void
add_random (GRand *gr,
guchar *pixel,
gint amount)
{
amount /= 2;
if (amount > 0)
{
gint i, tmp;
for (i = 0; i < alpha; i++)
{
tmp = pixel[i] + g_rand_int_range (gr, - amount, amount);
pixel[i] = CLAMP0255 (tmp);
}
}
}
static gboolean
do_plasma (GimpPixelFetcher *pft,
gint x1,
gint y1,
gint x2,
gint y2,
gint depth,
gint scale_depth,
GRand *gr)
{
guchar tl[4], ml[4], bl[4], mt[4], mm[4], mb[4], tr[4], mr[4], br[4];
guchar tmp[4];
gint xm, ym;
static gint count = 0;
xm = (x1 + x2) / 2;
ym = (y1 + y2) / 2;
/* Initial pass through - no averaging. */
if (depth == -1)
{
random_rgb (gr, tl);
put_pixel (pft, x1, y1, tl);
random_rgb (gr, tr);
put_pixel (pft, x2, y1, tr);
random_rgb (gr, bl);
put_pixel (pft, x1, y2, bl);
random_rgb (gr, br);
put_pixel (pft, x2, y2, br);
random_rgb (gr, mm);
put_pixel (pft, xm, ym, mm);
random_rgb (gr, ml);
put_pixel (pft, x1, ym, ml);
random_rgb (gr, mr);
put_pixel (pft, x2, ym, mr);
random_rgb (gr, mt);
put_pixel (pft, xm, y1, mt);
random_rgb (gr, mb);
put_pixel (pft, xm, y2, mb);
return FALSE;
}
/*
* Some later pass, at the bottom of this pass,
* with averaging at this depth.
*/
if (depth == 0)
{
gint ran;
if (x1 == x2 && y1 == y2)
{
return FALSE;
}
get_pixel (pft, x1, y1, tl);
get_pixel (pft, x1, y2, bl);
get_pixel (pft, x2, y1, tr);
get_pixel (pft, x2, y2, br);
ran = (gint) ((256.0 / (2.0 * scale_depth)) * pvals.turbulence);
if (xm != x1 || xm != x2)
{
/* Left. */
average_pixel (ml, tl, bl, bpp);
add_random (gr, ml, ran);
put_pixel (pft, x1, ym, ml);
if (x1 != x2)
{
/* Right. */
average_pixel (mr, tr, br, bpp);
add_random (gr, mr, ran);
put_pixel (pft, x2, ym, mr);
}
}
if (ym != y1 || ym != y2)
{
if (x1 != xm || ym != y2)
{
/* Bottom. */
average_pixel (mb, bl, br, bpp);
add_random (gr, mb, ran);
put_pixel (pft, xm, y2, mb);
}
if (y1 != y2)
{
/* Top. */
average_pixel (mt, tl, tr, bpp);
add_random (gr, mt, ran);
put_pixel (pft, xm, y1, mt);
}
}
if (y1 != y2 || x1 != x2)
{
/* Middle pixel. */
average_pixel (mm, tl, br, bpp);
average_pixel (tmp, bl, tr, bpp);
average_pixel (mm, mm, tmp, bpp);
add_random (gr, mm, ran);
put_pixel (pft, xm, ym, mm);
}
count++;
if (!(count % 2000) && pft)
{
gimp_progress_update ((gdouble) progress / (gdouble) max_progress);
}
return x2 - x1 < 3 && y2 - y1 < 3;
}
if (x1 < x2 || y1 < y2)
{
/* Top left. */
do_plasma (pft, x1, y1, xm, ym, depth - 1, scale_depth + 1, gr);
/* Bottom left. */
do_plasma (pft, x1, ym, xm ,y2, depth - 1, scale_depth + 1, gr);
/* Top right. */
do_plasma (pft, xm, y1, x2 , ym, depth - 1, scale_depth + 1, gr);
/* Bottom right. */
return do_plasma (pft, xm, ym, x2, y2, depth - 1, scale_depth + 1, gr);
}
else
{
return TRUE;
}
}
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