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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
*
* 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
* Note: set tabstops to 3 to make this more readable.
*/
/*
* Sparkle - simulate pixel bloom and diffraction effects
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "gtk/gtk.h"
#include "libgimp/gimp.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif /* M_PI */
#define SCALE_WIDTH 125
#define TILE_CACHE_SIZE 16
#define MAX_CHANNELS 4
#define PSV 2 /* point spread value */
#define EPSILON 0.001
#define SQR(a) ((a) * (a))
typedef struct
{
gdouble lum_threshold;
gdouble flare_inten;
gdouble spike_len;
gdouble spike_pts;
gdouble spike_angle;
} SparkleVals;
typedef struct
{
gint run;
} SparkleInterface;
/* Declare local functions.
*/
static void query (void);
static void run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals);
static gint sparkle_dialog (void);
static gint compute_luminosity (guchar * pixel,
gint gray,
gint has_alpha);
static gint compute_lum_threshold (GDrawable * drawable,
gdouble percentile);
static void sparkle (GDrawable * drawable,
gint threshold);
static void fspike (GPixelRgn * dest_rgn,
gint gray,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gdouble inten,
gdouble length,
gdouble angle);
static GTile* rpnt (GDrawable * drawable,
GTile * tile,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint * row,
gint * col,
gint bytes,
gdouble * inten);
static void rgb_to_hsl (gdouble r,
gdouble g,
gdouble b,
gdouble * h,
gdouble * s,
gdouble * l);
static void hsl_to_rgb (gdouble h,
gdouble sl,
gdouble l,
gdouble * r,
gdouble * g,
gdouble * b);
static void sparkle_close_callback (GtkWidget *widget,
gpointer data);
static void sparkle_ok_callback (GtkWidget *widget,
gpointer data);
static void sparkle_scale_update (GtkAdjustment *adjustment,
double *scale_val);
GPlugInInfo 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 */
6.0, /* spike points */
15.0 /* spike angle */
};
static SparkleInterface sint =
{
FALSE /* run */
};
static gint num_sparkles;
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_FLOAT, "lum_threshold", "Luminosity threshold (0.0 - 1.0)" },
{ PARAM_FLOAT, "flare_inten", "Flare intensity (0.0 - 1.0)" },
{ PARAM_FLOAT, "spike_len", "Spike length (in pixels)" },
{ PARAM_INT32, "spike_pts", "# of spike points" },
{ PARAM_FLOAT, "spike_angle", "Spike angle (0.0-360.0 degrees)" }
};
static GParamDef *return_vals = NULL;
static int nargs = sizeof (args) / sizeof (args[0]);
static int nreturn_vals = 0;
gimp_install_procedure ("plug_in_sparkle",
"Simulates pixel bloom and diffraction effects",
"More here later",
"John Beale, & (ported to GIMP v0.54) Michael J. Hammel & (ported to GIMP v1.0) Spencer Kimball",
"John Beale",
"1996",
"<Image>/Filters/Light Effects/Sparkle",
"RGB*, GRAY*",
PROC_PLUG_IN,
nargs, nreturn_vals,
args, return_vals);
}
static void
run (char *name,
int nparams,
GParam *param,
int *nreturn_vals,
GParam **return_vals)
{
static GParam values[1];
GDrawable *drawable;
GRunModeType run_mode;
GStatusType status = STATUS_SUCCESS;
gint threshold;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = PARAM_STATUS;
values[0].data.d_status = status;
switch (run_mode)
{
case RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data ("plug_in_sparkle", &svals);
/* First acquire information with a dialog */
if (! sparkle_dialog ())
return;
break;
case RUN_NONINTERACTIVE:
/* Make sure all the arguments are there! */
if (nparams != 8)
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS)
{
svals.lum_threshold = param[3].data.d_float;
svals.flare_inten = param[4].data.d_float;
svals.spike_len = param[5].data.d_float;
svals.spike_pts = param[6].data.d_int32;
svals.spike_angle = param[7].data.d_float;
}
if (status == STATUS_SUCCESS &&
(svals.lum_threshold < 0.0 || svals.lum_threshold > 1.0))
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS &&
(svals.flare_inten < 0.0 || svals.flare_inten > 1.0))
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS &&
(svals.spike_pts < 0))
status = STATUS_CALLING_ERROR;
if (status == STATUS_SUCCESS &&
(svals.spike_angle < 0.0 || svals.spike_angle > 360.0))
status = STATUS_CALLING_ERROR;
break;
case RUN_WITH_LAST_VALS:
/* 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_color (drawable->id) || gimp_drawable_gray (drawable->id))
{
gimp_progress_init ("Sparkling...");
gimp_tile_cache_ntiles (TILE_CACHE_SIZE);
/* compute the luminosity which exceeds the luminosity threshold */
threshold = compute_lum_threshold (drawable, svals.lum_threshold);
sparkle (drawable, threshold);
if (run_mode != RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store mvals data */
if (run_mode == RUN_INTERACTIVE)
gimp_set_data ("plug_in_sparkle", &svals, sizeof (SparkleVals));
}
else
{
/* gimp_message ("blur: cannot operate on indexed color images"); */
status = STATUS_EXECUTION_ERROR;
}
values[0].data.d_status = status;
gimp_drawable_detach (drawable);
}
static gint
sparkle_dialog ()
{
GtkWidget *dlg;
GtkWidget *label;
GtkWidget *button;
GtkWidget *scale;
GtkWidget *frame;
GtkWidget *table;
GtkObject *scale_data;
gchar **argv;
gint argc;
argc = 1;
argv = g_new (gchar *, 1);
argv[0] = g_strdup ("sparkle");
gtk_init (&argc, &argv);
gtk_rc_parse (gimp_gtkrc ());
dlg = gtk_dialog_new ();
gtk_window_set_title (GTK_WINDOW (dlg), "Sparkle");
gtk_window_position (GTK_WINDOW (dlg), GTK_WIN_POS_MOUSE);
gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
(GtkSignalFunc) sparkle_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) sparkle_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 ("Parameter Settings");
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 (5, 2, FALSE);
gtk_container_border_width (GTK_CONTAINER (table), 10);
gtk_container_add (GTK_CONTAINER (frame), table);
label = gtk_label_new ("Luminosity Threshold");
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);
scale_data = gtk_adjustment_new (svals.lum_threshold, 0.0, 0.1, 0.001, 0.001, 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, 0, 1, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_scale_set_digits (GTK_SCALE (scale), 3);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) sparkle_scale_update,
&svals.lum_threshold);
gtk_widget_show (label);
gtk_widget_show (scale);
label = gtk_label_new ("Flare Intensity");
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);
scale_data = gtk_adjustment_new (svals.flare_inten, 0.0, 1.0, 0.01, 0.01, 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), 2);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) sparkle_scale_update,
&svals.flare_inten);
gtk_widget_show (label);
gtk_widget_show (scale);
label = gtk_label_new ("Spike Length");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new (svals.spike_len, 1.0, 100.0, 1.0, 1.0, 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, 2, 3, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) sparkle_scale_update,
&svals.spike_len);
gtk_widget_show (label);
gtk_widget_show (scale);
label = gtk_label_new ("Spike Points");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 3, 4, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new (svals.spike_pts, 0.0, 16.0, 1.0, 1.0, 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, 3, 4, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_scale_set_digits (GTK_SCALE (scale), 0);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) sparkle_scale_update,
&svals.spike_pts);
gtk_widget_show (label);
gtk_widget_show (scale);
label = gtk_label_new ("Spike Angle");
gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
gtk_table_attach (GTK_TABLE (table), label, 0, 1, 4, 5, GTK_FILL, 0, 5, 0);
scale_data = gtk_adjustment_new (svals.spike_angle, 0.0, 360.0, 5.0, 5.0, 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, 4, 5, GTK_FILL, 0, 0, 0);
gtk_scale_set_value_pos (GTK_SCALE (scale), GTK_POS_TOP);
gtk_range_set_update_policy (GTK_RANGE (scale), GTK_UPDATE_DELAYED);
gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
(GtkSignalFunc) sparkle_scale_update,
&svals.spike_angle);
gtk_widget_show (label);
gtk_widget_show (scale);
gtk_widget_show (frame);
gtk_widget_show (table);
gtk_widget_show (dlg);
gtk_main ();
gdk_flush ();
return sint.run;
}
static gint
compute_luminosity (guchar *pixel,
gint gray,
gint has_alpha)
{
if (gray)
{
if (has_alpha)
return (pixel[0] * pixel[1]) / 255;
else
return pixel[0];
}
else
{
gint min, max;
min = MIN (pixel[0], pixel[1]);
min = MIN (min, pixel[2]);
max = MAX (pixel[0], pixel[1]);
max = MAX (max, pixel[2]);
if (has_alpha)
return ((min + max) * pixel[3]) / 510;
else
return (min + max) / 2;
}
}
static gint
compute_lum_threshold (GDrawable *drawable,
gdouble percentile)
{
GPixelRgn 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 */
for (i = 0; i < 256; i++)
values[i] = 0;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
gray = gimp_drawable_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 / (gdouble) total > percentile)
{
num_sparkles = sum;
return i;
}
}
return 0;
}
static void
sparkle (GDrawable *drawable,
gint threshold)
{
GPixelRgn src_rgn, dest_rgn;
guchar *src, *dest;
gdouble nfrac, length, inten;
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;
gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
gray = gimp_drawable_gray (drawable->id);
has_alpha = gimp_drawable_has_alpha (drawable->id);
alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp;
/* 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 (1, &src_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++)
{
lum = compute_luminosity (src, gray, has_alpha);
if (lum >= threshold)
{
nfrac = fabs ((gdouble) (lum + 1 - threshold) / (gdouble) (256 - threshold));
length = svals.spike_len * pow (nfrac, 0.8);
inten = svals.flare_inten * pow (nfrac, 1.0);
/* fspike im x,y intens rlength angle */
if (svals.spike_pts > 0)
{
/* major spikes */
fspike (&dest_rgn, gray, x1, y1, x2, y2,
x + src_rgn.x, y + src_rgn.y,
inten, length, svals.spike_angle);
/* minor spikes */
fspike (&dest_rgn, gray, x1, y1, x2, y2,
x + src_rgn.x, y + src_rgn.y,
inten * 0.7, length * 0.7,
(svals.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 void
fspike (GPixelRgn *dest_rgn,
gint gray,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gdouble inten,
gdouble length,
gdouble angle)
{
gdouble xrt, yrt, dx, dy;
gdouble rpos;
gdouble in[MAX_CHANNELS];
gdouble val[MAX_CHANNELS];
gdouble ho = 1.0, so = 1.0, vo = 1.0;
gdouble theta, efac;
gdouble sfac;
gdouble *gd_tmp1, *gd_tmp2;
guchar *guc_tmp;
GTile *tile = NULL;
gint row, col;
gint i;
gint bytes;
gint x, y;
gint ok;
gint b;
guchar pixel[MAX_CHANNELS];
theta = angle;
efac = 2.0; /* exponent on intensity falloff with radius */
bytes = dest_rgn->bpp;
row = -1;
col = -1;
/* draw the major spikes */
for (i = 0; i < svals.spike_pts; i++)
{
x = (int) (xr + 0.5);
y = (int) (yr + 0.5);
gimp_pixel_rgn_get_pixel (dest_rgn, pixel, x, y);
for (b = 0, gd_tmp1 = val, guc_tmp = pixel; b < bytes; b++)
*gd_tmp1++ = (gdouble) (gint)(*guc_tmp++) / 255.0;
/* increase saturation to full for color image */
if (! gray)
{
rgb_to_hsl (val[0], val[1], val[2], &ho, &so, &vo);
hsl_to_rgb (ho, 1.0, vo, &val[0], &val[1], &val[2]);
}
dx = 0.2 * cos (theta * M_PI / 180.0);
dy = 0.2 * sin (theta * M_PI / 180.0);
xrt = xr;
yrt = yr;
rpos = 0.2;
do
{
sfac = exp (-pow (rpos / length, efac));
sfac = sfac * inten;
ok = FALSE;
for (b = 0, gd_tmp1 = in, gd_tmp2 = val; b < bytes;
b++, gd_tmp1++, gd_tmp2++)
{
*gd_tmp1 = 0.2 * (*gd_tmp2) * sfac;
if (*gd_tmp1 > 0.01)
ok = TRUE;
}
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt, &row, &col, bytes, in);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1, yrt, &row, &col, bytes, in);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1, yrt + 1, &row, &col, bytes, in);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt + 1, &row, &col, bytes, in);
xrt += dx;
yrt += dy;
rpos += 0.2;
} while (ok);
theta += 360.0 / svals.spike_pts;
}
if (tile)
gimp_tile_unref (tile, TRUE);
}
static GTile *
rpnt (GDrawable *drawable,
GTile *tile,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint *row,
gint *col,
gint bytes,
gdouble *inten)
{
gint x, y, b;
gdouble dx, dy, rs, fac;
gdouble val;
guchar *pixel;
guchar *guc_tmp;
gdouble *gd_tmp;
x = (int) (xr); /* integer coord. to upper left of real point */
y = (int) (yr);
if (x >= x1 && y >= y1 && x < x2 && y < y2)
{
if ((x >> 6 != *col) || (y >> 6 != *row))
{
*col = x >> 6;
*row = y >> 6;
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 * (y % 64) + (x % 64));
dx = xr - x; dy = yr - y;
rs = dx * dx + dy * dy;
fac = exp (-rs / PSV);
for (b = 0, guc_tmp = pixel, gd_tmp = inten; b < bytes;
b++, guc_tmp++, gd_tmp++)
{
val = (*gd_tmp) * fac;
val += (gdouble) *guc_tmp / 255.0;
if (val > 1.0) val = 1.0;
*guc_tmp = (guchar) (val * 255.0);
}
}
return tile;
}
/*
* RGB-HSL transforms.
* Ken Fishkin, Pixar Inc., January 1989.
*/
/*
* given r,g,b on [0 ... 1],
* return (h,s,l) on [0 ... 1]
*/
static void
rgb_to_hsl (gdouble r,
gdouble g,
gdouble b,
gdouble *h,
gdouble *s,
gdouble *l)
{
gdouble v;
gdouble m;
gdouble vm;
gdouble r2, g2, b2;
v = MAX(r,g);
v = MAX(v,b);
m = MIN(r,g);
m = MIN(m,b);
if ((*l = (m + v) / 2.0) <= 0.0)
return;
if ((*s = vm = v - m) > 0.0)
{
*s /= (*l <= 0.5) ? (v + m ) :
(2.0 - v - m) ;
}
else
return;
r2 = (v - r) / vm;
g2 = (v - g) / vm;
b2 = (v - b) / vm;
if (r == v)
*h = (g == m ? 5.0 + b2 : 1.0 - g2);
else if (g == v)
*h = (b == m ? 1.0 + r2 : 3.0 - b2);
else
*h = (r == m ? 3.0 + g2 : 5.0 - r2);
*h /= 6;
}
/*
* given h,s,l on [0..1],
* return r,g,b on [0..1]
*/
static void
hsl_to_rgb (gdouble h,
gdouble sl,
gdouble l,
gdouble *r,
gdouble *g,
gdouble *b)
{
gdouble v;
v = (l <= 0.5) ? (l * (1.0 + sl)) : (l + sl - l * sl);
if (v <= 0)
{
*r = *g = *b = 0.0;
}
else
{
gdouble m;
gdouble sv;
gint sextant;
gdouble fract, vsf, mid1, mid2;
m = l + l - v;
sv = (v - m ) / v;
h *= 6.0;
sextant = h;
fract = h - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0: *r = v; *g = mid1; *b = m; break;
case 1: *r = mid2; *g = v; *b = m; break;
case 2: *r = m; *g = v; *b = mid1; break;
case 3: *r = m; *g = mid2; *b = v; break;
case 4: *r = mid1; *g = m; *b = v; break;
case 5: *r = v; *g = m; *b = mid2; break;
}
}
}
/* Sparkle interface functions */
static void
sparkle_close_callback (GtkWidget *widget,
gpointer data)
{
gtk_main_quit ();
}
static void
sparkle_ok_callback (GtkWidget *widget,
gpointer data)
{
sint.run = TRUE;
gtk_widget_destroy (GTK_WIDGET (data));
}
static void
sparkle_scale_update (GtkAdjustment *adjustment,
double *scale_val)
{
*scale_val = adjustment->value;
}
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