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gimp/plug-ins/common/sparkle.c

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/* Sparkle --- image filter plug-in for The Gimp image manipulation program
* Copyright (C) 1996 by John Beale; ported to Gimp by Michael J. Hammel;
* It has been optimized a little, bugfixed and modified by Martin Weber
* for additional functionality.
*
* 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.
*
* You can contact Michael at mjhammel@csn.net
* You can contact Martin at martweb@gmx.net
* Note: set tabstops to 3 to make this more readable.
*/
/*
* Sparkle 1.26 - simulate pixel bloom and diffraction effects
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define SCALE_WIDTH 175
#define MAX_CHANNELS 4
#define PSV 2 /* point spread value */
#define EPSILON 0.001
#define NATURAL 0
#define FOREGROUND 1
#define BACKGROUND 2
typedef struct
{
gdouble lum_threshold;
gdouble flare_inten;
gdouble spike_len;
gdouble spike_pts;
gdouble spike_angle;
gdouble density;
gdouble opacity;
gdouble random_hue;
gdouble random_saturation;
gint preserve_luminosity;
gint invers;
gint border;
gint colortype;
} SparkleVals;
typedef struct
{
gint run;
} SparkleInterface;
/* Declare local functions.
*/
static void query (void);
static void run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint sparkle_dialog (void);
static void sparkle_ok_callback (GtkWidget *widget,
gpointer data);
static gint compute_luminosity (guchar *pixel,
gint gray,
gint has_alpha);
static gint compute_lum_threshold (GimpDrawable *drawable,
gdouble percentile);
static void sparkle (GimpDrawable *drawable,
gint threshold);
static void fspike (GimpPixelRgn *src_rgn,
GimpPixelRgn *dest_rgn,
gint gray,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gint tile_width,
gint tile_height,
gdouble inten,
gdouble length,
gdouble angle);
static GimpTile* rpnt (GimpDrawable *drawable,
GimpTile *tile,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint tile_width,
gint tile_height,
gint *row,
gint *col,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS]);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
static SparkleVals svals =
{
0.001, /* luminosity threshold */
0.5, /* flare intensity */
20.0, /* spike length */
4.0, /* spike points */
15.0, /* spike angle */
1.0, /* spike density */
0.0, /* opacity */
0.0, /* random hue */
0.0, /* random saturation */
FALSE, /* preserve_luminosity */
FALSE, /* invers */
FALSE, /* border */
NATURAL /* colortype */
};
static SparkleInterface sint =
{
FALSE /* run */
};
static gint num_sparkles;
MAIN ()
static void
query (void)
{
static 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_FLOAT, "lum_threshold", "Luminosity threshold (0.0 - 1.0)" },
{ GIMP_PDB_FLOAT, "flare_inten", "Flare intensity (0.0 - 1.0)" },
{ GIMP_PDB_INT32, "spike_len", "Spike length (in pixels)" },
{ GIMP_PDB_INT32, "spike_pts", "# of spike points" },
{ GIMP_PDB_INT32, "spike_angle", "Spike angle (0-360 degrees, -1: random)" },
{ GIMP_PDB_FLOAT, "density", "Spike density (0.0 - 1.0)" },
{ GIMP_PDB_FLOAT, "opacity", "Opacity (0.0 - 1.0)" },
{ GIMP_PDB_FLOAT, "random_hue", "Random hue (0.0 - 1.0)" },
{ GIMP_PDB_FLOAT, "random_saturation", "Random saturation (0.0 - 1.0)" },
{ GIMP_PDB_INT32, "preserve_luminosity", "Preserve luminosity (TRUE/FALSE)" },
{ GIMP_PDB_INT32, "invers", "Invers (TRUE/FALSE)" },
{ GIMP_PDB_INT32, "border", "Add border (TRUE/FALSE)" },
{ GIMP_PDB_INT32, "colortype", "Color of sparkles: { NATURAL (0), FOREGROUND (1), BACKGROUND (2) }" }
};
static gint nargs = sizeof (args) / sizeof (args[0]);
gimp_install_procedure ("plug_in_sparkle",
"Simulates pixel bloom and diffraction effects",
"No help yet",
"John Beale, & (ported to GIMP v0.54) Michael J. Hammel & ted to GIMP v1.0) Spencer Kimball",
"John Beale",
"Version 1.26, December 1998",
N_("<Image>/Filters/Light Effects/Sparkle..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
nargs, 0,
args, NULL);
}
static void
run (gchar *name,
gint nparams,
GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[1];
GimpDrawable *drawable;
GimpRunModeType run_mode;
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
gint threshold, x1, y1, x2, y2;
run_mode = param[0].data.d_int32;
*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:
INIT_I18N_UI();
/* Possibly retrieve data */
gimp_get_data ("plug_in_sparkle", &svals);
/* First acquire information with a dialog */
if (! sparkle_dialog ())
return;
break;
case GIMP_RUN_NONINTERACTIVE:
INIT_I18N();
/* Make sure all the arguments are there! */
if (nparams != 16)
{
status = GIMP_PDB_CALLING_ERROR;
}
else
{
svals.lum_threshold = param[3].data.d_float;
svals.flare_inten = param[4].data.d_float;
svals.spike_len = param[5].data.d_int32;
svals.spike_pts = param[6].data.d_int32;
svals.spike_angle = param[7].data.d_int32;
svals.density = param[8].data.d_float;
svals.opacity = param[9].data.d_float;
svals.random_hue = param[10].data.d_float;
svals.random_saturation = param[11].data.d_float;
svals.preserve_luminosity = (param[12].data.d_int32) ? TRUE : FALSE;
svals.invers = (param[13].data.d_int32) ? TRUE : FALSE;
svals.border = (param[14].data.d_int32) ? TRUE : FALSE;
svals.colortype = param[15].data.d_int32;
if (svals.lum_threshold < 0.0 || svals.lum_threshold > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.flare_inten < 0.0 || svals.flare_inten > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.spike_len < 0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.spike_pts < 0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.spike_angle < -1 || svals.spike_angle > 360)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.density < 0.0 || svals.density > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.opacity < 0.0 || svals.opacity > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.random_hue < 0.0 || svals.random_hue > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.random_saturation < 0.0 ||
svals.random_saturation > 1.0)
status = GIMP_PDB_CALLING_ERROR;
else if (svals.colortype < NATURAL || svals.colortype > BACKGROUND)
status = GIMP_PDB_CALLING_ERROR;
}
break;
case GIMP_RUN_WITH_LAST_VALS:
INIT_I18N();
/* Possibly retrieve data */
gimp_get_data ("plug_in_sparkle", &svals);
break;
default:
break;
}
/* Get the specified drawable */
drawable = gimp_drawable_get (param[2].data.d_drawable);
/* 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 (_("Sparkling..."));
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
if (svals.border == FALSE)
/* compute the luminosity which exceeds the luminosity threshold */
threshold = compute_lum_threshold (drawable, svals.lum_threshold);
else
{
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
num_sparkles = 2 * (x2 - x1 + y2 - y1);
threshold = 255;
}
sparkle (drawable, threshold);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store mvals data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data ("plug_in_sparkle", &svals, sizeof (SparkleVals));
}
else
{
/* gimp_message ("sparkle: cannot operate on indexed color images"); */
status = GIMP_PDB_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gint
sparkle_dialog (void)
{
GtkWidget *dlg;
GtkWidget *main_vbox;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *frame;
GtkWidget *table;
GtkWidget *toggle;
GtkWidget *sep;
GtkWidget *r1, *r2, *r3;
GtkObject *scale_data;
gimp_ui_init ("sparkle", FALSE);
dlg = gimp_dialog_new (_("Sparkle"), "sparkle",
gimp_standard_help_func, "filters/sparkle.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
_("OK"), sparkle_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);
gtk_widget_show (frame);
main_vbox = gtk_vbox_new (FALSE, 4);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 4);
gtk_container_add (GTK_CONTAINER (frame), main_vbox);
gtk_widget_show (main_vbox);
table = gtk_table_new (9, 3, FALSE);
gtk_table_set_col_spacings (GTK_TABLE (table), 4);
gtk_table_set_row_spacings (GTK_TABLE (table), 2);
gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
gtk_widget_show (table);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
_("Luminosity Threshold:"), SCALE_WIDTH, 0,
svals.lum_threshold, 0.0, 0.1, 0.001, 0.01, 3,
TRUE, 0, 0,
_("Adjust the Luminosity Threshold"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.lum_threshold);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
_("Flare Intensity:"), SCALE_WIDTH, 0,
svals.flare_inten, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the Flare Intensity"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.flare_inten);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
_("Spike Length:"), SCALE_WIDTH, 0,
svals.spike_len, 1, 100, 1, 10, 0,
TRUE, 0, 0,
_("Adjust the Spike Length"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.spike_len);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 3,
_("Spike Points:"), SCALE_WIDTH, 0,
svals.spike_pts, 0, 16, 1, 4, 0,
TRUE, 0, 0,
_("Adjust the Number of Spikes"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.spike_pts);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 4,
_("Spike Angle (-1: Random):"), SCALE_WIDTH, 0,
svals.spike_angle, -1, 360, 1, 15, 0,
TRUE, 0, 0,
_("Adjust the Spike Angle "
"(-1 means a Random Angle is choosen)"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.spike_angle);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 5,
_("Spike Density:"), SCALE_WIDTH, 0,
svals.density, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the Spike Density"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.density);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 6,
_("Opacity:"), SCALE_WIDTH, 0,
svals.opacity, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the Opacity of the Spikes"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.opacity);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 7,
_("Random Hue:"), SCALE_WIDTH, 0,
svals.random_hue, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the Value how much the Hue should "
"be changed randomly"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.random_hue);
scale_data =
gimp_scale_entry_new (GTK_TABLE (table), 0, 8,
_("Random Saturation:"), SCALE_WIDTH, 0,
svals.random_saturation, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the Value how much the Saturation should "
"be changed randomly"), NULL);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
&svals.random_saturation);
sep = gtk_hseparator_new ();
gtk_box_pack_start (GTK_BOX (main_vbox), sep, FALSE, FALSE, 0);
gtk_widget_show (sep);
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
vbox = gtk_vbox_new (FALSE, 1);
gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
toggle = gtk_check_button_new_with_label (_("Preserve Luminosity"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
svals.preserve_luminosity);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&svals.preserve_luminosity);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle, _("Should the Luminosity be preserved?"),
NULL);
toggle = gtk_check_button_new_with_label (_("Inverse"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.invers);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&svals.invers);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle, _("Should an Inverse Effect be done?"), NULL);
toggle = gtk_check_button_new_with_label (_("Add Border"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.border);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&svals.border);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("Draw a Border of Spikes around the Image"),
NULL);
sep = gtk_vseparator_new ();
gtk_box_pack_start (GTK_BOX (hbox), sep, FALSE, FALSE, 0);
gtk_widget_show (sep);
/* colortype */
vbox =
gimp_radio_group_new2 (FALSE, NULL,
gimp_radio_button_update,
&svals.colortype, (gpointer) svals.colortype,
_("Natural Color"), (gpointer) NATURAL, &r1,
_("Foreground Color"), (gpointer) FOREGROUND, &r2,
_("Background Color"), (gpointer) BACKGROUND, &r3,
NULL);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 0);
gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
gimp_help_set_help_data (r1, _("Use the Color of the Image"), NULL);
gimp_help_set_help_data (r2, _("Use the Foreground Color"), NULL);
gimp_help_set_help_data (r3, _("Use the Background Color"), NULL);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return sint.run;
}
static gint
compute_luminosity (guchar *pixel,
gint gray,
gint has_alpha)
{
gint pixel0, pixel1, pixel2;
if (svals.invers == FALSE)
{
pixel0 = pixel[0];
pixel1 = pixel[1];
pixel2 = pixel[2];
}
else
{
pixel0 = 255 - pixel[0];
pixel1 = 255 - pixel[1];
pixel2 = 255 - pixel[2];
}
if (gray)
{
if (has_alpha)
return (pixel0 * pixel1) / 255;
else
return (pixel0);
}
else
{
gint min, max;
min = MIN (pixel0, pixel1);
min = MIN (min, pixel2);
max = MAX (pixel0, pixel1);
max = MAX (max, pixel2);
if (has_alpha)
return ((min + max) * pixel[3]) / 510;
else
return (min + max) / 2;
}
}
static gint
compute_lum_threshold (GimpDrawable *drawable,
gdouble percentile)
{
GimpPixelRgn src_rgn;
gpointer pr;
guchar *data;
gint values[256];
gint total, sum;
gint size;
gint gray;
gint has_alpha;
gint i;
gint x1, y1, x2, y2;
/* zero out the luminosity values array */
memset (values, 0, sizeof (gint) * 256);
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
gray = gimp_drawable_is_gray (drawable->id);
has_alpha = gimp_drawable_has_alpha (drawable->id);
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
for (pr = gimp_pixel_rgns_register (1, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
data = src_rgn.data;
size = src_rgn.w * src_rgn.h;
while (size--)
{
values [compute_luminosity (data, gray, has_alpha)]++;
data += src_rgn.bpp;
}
}
total = (x2 - x1) * (y2 - y1);
sum = 0;
for (i = 255; i >= 0; i--)
{
sum += values[i];
if ((gdouble) sum > percentile * (gdouble) total)
{
num_sparkles = sum;
return i;
}
}
return 0;
}
static void
sparkle (GimpDrawable *drawable,
gint threshold)
{
GimpPixelRgn src_rgn, dest_rgn;
guchar *src, *dest;
gdouble nfrac, length, inten, spike_angle;
gint cur_progress, max_progress;
gint x1, y1, x2, y2;
gint size, lum, x, y, b;
gint gray;
gint has_alpha, alpha;
gpointer pr;
guchar *tmp1;
gint tile_width, tile_height;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
gray = gimp_drawable_is_gray (drawable->id);
has_alpha = gimp_drawable_has_alpha (drawable->id);
alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp;
tile_width = gimp_tile_width();
tile_height = gimp_tile_height();
/* initialize the progress dialog */
cur_progress = 0;
max_progress = num_sparkles;
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
src = src_rgn.data;
dest = dest_rgn.data;
size = src_rgn.w * src_rgn.h;
while (size --)
{
if(has_alpha && src[alpha] == 0)
{
memset(dest, 0, alpha * sizeof(guchar));
dest += alpha;
}
else
{
for (b = 0, tmp1 = src; b < alpha; b++)
{
*dest++ = *tmp1++;
}
}
if (has_alpha)
*dest++ = src[alpha];
src += src_rgn.bpp;
}
}
/* add effects to new image based on intensity of old pixels */
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
src = src_rgn.data;
for (y = 0; y < src_rgn.h; y++)
for (x = 0; x < src_rgn.w; x++)
{
if (svals.border)
{
if (x + src_rgn.x == 0 || y + src_rgn.y == 0
|| x + src_rgn.x == drawable->width - 1
|| y + src_rgn.y == drawable->height - 1)
lum = 255;
else
lum = 0;
}
else
lum = compute_luminosity (src, gray, has_alpha);
if (lum >= threshold)
{
nfrac = fabs ((gdouble) (lum + 1 - threshold) /
(gdouble) (256 - threshold));
length = (gdouble) svals.spike_len * (gdouble) pow (nfrac, 0.8);
inten = svals.flare_inten * nfrac /* pow (nfrac, 1.0) */;
/* fspike im x,y intens rlength angle */
if (svals.spike_pts > 0)
{
/* major spikes */
if (svals.spike_angle == -1)
spike_angle = 360.0 * rand () / G_MAXRAND;
else
spike_angle = svals.spike_angle;
if (rand() <= G_MAXRAND * svals.density)
{
fspike (&src_rgn, &dest_rgn, gray, x1, y1, x2, y2,
x + src_rgn.x, y + src_rgn.y,
tile_width, tile_height,
inten, length, spike_angle);
/* minor spikes */
fspike (&src_rgn, &dest_rgn, gray, x1, y1, x2, y2,
x + src_rgn.x, y + src_rgn.y,
tile_width, tile_height,
inten * 0.7, length * 0.7,
((gdouble) spike_angle + 180.0 / svals.spike_pts));
}
}
cur_progress ++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((double) cur_progress /
(double) max_progress);
}
src += src_rgn.bpp;
}
}
gimp_progress_update (1.0);
/* update the blurred region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->id, TRUE);
gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
}
static inline GimpTile *
rpnt (GimpDrawable *drawable,
GimpTile *tile,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint tile_width,
gint tile_height,
gint *row,
gint *col,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS])
{
gint x, y, b;
gdouble dx, dy, rs, val;
guchar *pixel;
gdouble new;
gint newcol, newrow;
gint newcoloff, newrowoff;
x = (int) (xr); /* integer coord. to upper left of real point */
y = (int) (yr);
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
newcol = x / tile_width;
newcoloff = x % tile_width;
newrow = y / tile_height;
newrowoff = y % tile_height;
if ((newcol != *col) || (newrow != *row))
{
*col = newcol;
*row = newrow;
if (tile)
gimp_tile_unref (tile, TRUE);
tile = gimp_drawable_get_tile (drawable, TRUE, *row, *col);
gimp_tile_ref (tile);
}
pixel = tile->data + tile->bpp * (tile->ewidth * newrowoff + newcoloff);
dx = xr - x; dy = yr - y;
rs = dx * dx + dy * dy;
val = inten * exp (-rs / PSV);
for (b = 0; b < bytes; b++)
{
if (svals.invers == FALSE)
new = pixel[b];
else
new = 255 - pixel[b];
if (svals.preserve_luminosity==TRUE)
{
if (new < color[b])
new *= (1.0 - val * (1.0 - svals.opacity));
else
{
new -= val * color[b] * (1.0 - svals.opacity);
if (new < 0.0)
new = 0.0;
}
}
new *= 1.0 - val * svals.opacity;
new += val * color[b];
if (new > 255) new = 255;
if (svals.invers != FALSE)
pixel[b] = 255 - new;
else
pixel[b] = new;
}
}
return tile;
}
static void
fspike (GimpPixelRgn *src_rgn,
GimpPixelRgn *dest_rgn,
gint gray,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gint tile_width,
gint tile_height,
gdouble inten,
gdouble length,
gdouble angle)
{
const gdouble efac = 2.0;
gdouble xrt, yrt, dx, dy;
gdouble rpos;
gdouble in;
gdouble theta;
gdouble sfac;
gint r, g, b;
GimpTile *tile = NULL;
gint row, col;
gint i;
gint bytes;
gint ok;
guchar pixel[MAX_CHANNELS];
guchar color[MAX_CHANNELS];
theta = angle;
bytes = dest_rgn->bpp;
row = -1;
col = -1;
/* draw the major spikes */
for (i = 0; i < svals.spike_pts; i++)
{
gimp_pixel_rgn_get_pixel (dest_rgn, pixel, xr, yr);
switch (svals.colortype)
{
case FOREGROUND:
gimp_palette_get_foreground (&color[0], &color[1], &color[2]);
break;
case BACKGROUND:
gimp_palette_get_background (&color[0], &color[1], &color[2]);
break;
default:
color[0] = pixel[0];
color[1] = pixel[1];
color[2] = pixel[2];
break;
}
if (svals.invers)
{
color[0] = 255 - color[0];
color[1] = 255 - color[1];
color[2] = 255 - color[2];
}
if (svals.random_hue > 0.0 || svals.random_saturation > 0.0)
{
r = 255 - color[0];
g = 255 - color[1];
b = 255 - color[2];
gimp_rgb_to_hsv (&r, &g, &b);
r+= (svals.random_hue * ((gdouble) rand() / (gdouble) RAND_MAX - 0.5))*255;
if (r >= 255)
r -= 255;
else if (r < 0)
r += 255;
b+= (svals.random_saturation * (2.0 * (gdouble) rand() /
(gdouble) RAND_MAX - 1.0))*255;
if (b > 255) b = 255;
gimp_hsv_to_rgb (&r, &g, &b);
color[0] = 255 - r;
color[1] = 255 - g;
color[2] = 255 - b;
}
dx = 0.2 * cos (theta * G_PI / 180.0);
dy = 0.2 * sin (theta * G_PI / 180.0);
xrt = (gdouble) xr; /* (gdouble) is needed because some */
yrt = (gdouble) yr; /* compilers optimize too much otherwise */
rpos = 0.2;
do
{
sfac = inten * exp (-pow (rpos / length, efac));
ok = FALSE;
in = 0.2 * sfac;
if (in > 0.01)
ok = TRUE;
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt, tile_width, tile_height, &row, &col, bytes, in, color);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1.0, yrt, tile_width, tile_height, &row, &col, bytes, in, color);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1.0, yrt + 1.0, tile_width, tile_height, &row, &col, bytes, in, color);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt + 1.0, tile_width, tile_height, &row, &col, bytes, in, color);
xrt += dx;
yrt += dy;
rpos += 0.2;
} while (ok);
theta += 360.0 / svals.spike_pts;
}
if (tile)
gimp_tile_unref (tile, TRUE);
}
static void
sparkle_ok_callback (GtkWidget *widget,
gpointer data)
{
sint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
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