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gimp/plug-ins/common/sparkle.c

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/* Sparkle --- image filter plug-in for GIMP
* 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. Also bugfixed by Seth Burgess (9/17/03)
* to take rowstrides into account when selections are present (bug #50911).
* Attempted reformatting.
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*
* You can contact Michael at mjhammel@csn.net
* You can contact Martin at martweb@gmx.net
* You can contact Seth at sjburges@gimp.org
*/
/*
* Sparkle 1.27 - simulate pixel bloom and diffraction effects
*/
#include "config.h"
#include <string.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-sparkle"
#define PLUG_IN_BINARY "sparkle"
#define PLUG_IN_ROLE "gimp-sparkle"
#define SCALE_WIDTH 175
#define ENTRY_WIDTH 7
#define MAX_CHANNELS 4
#define PSV 2 /* point spread value */
#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 transparency;
gdouble random_hue;
gdouble random_saturation;
gboolean preserve_luminosity;
gboolean inverse;
gboolean border;
gint colortype;
} SparkleVals;
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gboolean sparkle_dialog (GimpDrawable *drawable);
static gint compute_luminosity (const guchar *pixel,
gboolean gray,
gboolean has_alpha);
static gint compute_lum_threshold (GimpDrawable *drawable,
gdouble percentile);
static void sparkle (GimpDrawable *drawable,
GimpPreview *preview);
static void fspike (GimpPixelRgn *src_rgn,
GimpPixelRgn *dest_rgn,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gint tile_width,
gint tile_height,
gdouble inten,
gdouble length,
gdouble angle,
GRand *gr,
guchar *dest_buf);
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],
guchar *dest_buf);
const 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, /* transparency */
0.0, /* random hue */
0.0, /* random saturation */
FALSE, /* preserve_luminosity */
FALSE, /* inverse */
FALSE, /* border */
NATURAL /* colortype */
};
static gint num_sparkles;
MAIN ()
static void
query (void)
{
static const GimpParamDef args[] =
{
{ GIMP_PDB_INT32, "run-mode", "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
{ 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, "transparency", "Transparency (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, "inverse", "Inverse (TRUE/FALSE)" },
{ GIMP_PDB_INT32, "border", "Add border (TRUE/FALSE)" },
{ GIMP_PDB_INT32, "color-type", "Color of sparkles: { NATURAL (0), FOREGROUND (1), BACKGROUND (2) }" }
};
gimp_install_procedure (PLUG_IN_PROC,
N_("Turn bright spots into starry sparkles"),
"Uses a percentage based luminoisty threhsold to find "
"candidate pixels for adding some sparkles (spikes). ",
"John Beale, & (ported to GIMP v0.54) Michael "
"J. Hammel & ted to GIMP v1.0) & Seth Burgess & "
"Spencer Kimball",
"John Beale",
"Version 1.27, September 2003",
N_("_Sparkle..."),
"RGB*, GRAY*",
GIMP_PLUGIN,
G_N_ELEMENTS (args), 0,
args, NULL);
gimp_plugin_menu_register (PLUG_IN_PROC,
"<Image>/Filters/Light and Shadow/Light");
}
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;
gint x, y, w, h;
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);
if (! gimp_drawable_mask_intersect (drawable->drawable_id, &x, &y, &w, &h))
{
g_message (_("Region selected for filter is empty"));
return;
}
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &svals);
/* First acquire information with a dialog */
if (! sparkle_dialog (drawable))
return;
break;
case GIMP_RUN_NONINTERACTIVE:
/* 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.transparency = 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.inverse = (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.transparency < 0.0 || svals.transparency > 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:
/* Possibly retrieve data */
gimp_get_data (PLUG_IN_PROC, &svals);
break;
default:
break;
}
/* 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 (_("Sparkling"));
sparkle (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
/* Store mvals data */
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &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 gboolean
sparkle_dialog (GimpDrawable *drawable)
{
GtkWidget *dialog;
GtkWidget *main_vbox;
GtkWidget *preview;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *grid;
GtkWidget *toggle;
GtkWidget *r1, *r2, *r3;
GtkAdjustment *scale_data;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY, FALSE);
dialog = gimp_dialog_new (_("Sparkle"), PLUG_IN_ROLE,
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Cancel"), GTK_RESPONSE_CANCEL,
_("_OK"), GTK_RESPONSE_OK,
NULL);
gimp_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_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
main_vbox, TRUE, TRUE, 0);
gtk_widget_show (main_vbox);
preview = gimp_drawable_preview_new_from_drawable_id (drawable->drawable_id);
gtk_box_pack_start (GTK_BOX (main_vbox), preview, TRUE, TRUE, 0);
gtk_widget_show (preview);
g_signal_connect_swapped (preview, "invalidated",
G_CALLBACK (sparkle),
drawable);
grid = gtk_grid_new ();
gtk_grid_set_row_spacing (GTK_GRID (grid), 6);
gtk_grid_set_column_spacing (GTK_GRID (grid), 6);
gtk_box_pack_start (GTK_BOX (main_vbox), grid, FALSE, FALSE, 0);
gtk_widget_show (grid);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 0,
_("Luminosity _threshold:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.lum_threshold, 0.0, 0.1, 0.001, 0.01, 3,
TRUE, 0, 0,
_("Adjust the luminosity threshold"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.lum_threshold);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 1,
_("F_lare intensity:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.flare_inten, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the flare intensity"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.flare_inten);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 2,
_("_Spike length:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.spike_len, 1, 100, 1, 10, 0,
TRUE, 0, 0,
_("Adjust the spike length"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.spike_len);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 3,
_("Sp_ike points:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.spike_pts, 0, 16, 1, 4, 0,
TRUE, 0, 0,
_("Adjust the number of spikes"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.spike_pts);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 4,
_("Spi_ke angle (-1: random):"), SCALE_WIDTH, ENTRY_WIDTH,
svals.spike_angle, -1, 360, 1, 15, 0,
TRUE, 0, 0,
_("Adjust the spike angle "
"(-1 causes a random angle to be chosen)"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.spike_angle);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 5,
_("Spik_e density:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.density, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the spike density"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.density);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 6,
_("Tr_ansparency:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.transparency, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust the opacity of the spikes"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.transparency);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 7,
_("_Random hue:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.random_hue, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust how much the hue should be changed randomly"), NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.random_hue);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
scale_data =
gimp_scale_entry_new (GTK_GRID (grid), 0, 8,
_("Rando_m saturation:"), SCALE_WIDTH, ENTRY_WIDTH,
svals.random_saturation, 0.0, 1.0, 0.01, 0.1, 2,
TRUE, 0, 0,
_("Adjust how much the saturation should be changed randomly"),
NULL);
g_signal_connect (scale_data, "value-changed",
G_CALLBACK (gimp_double_adjustment_update),
&svals.random_saturation);
g_signal_connect_swapped (scale_data, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 12);
gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
toggle = gtk_check_button_new_with_mnemonic (_("_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_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("Should the luminosity be preserved?"), NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&svals.preserve_luminosity);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("In_verse"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.inverse);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("Should the effect be inversed?"), NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&svals.inverse);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
toggle = gtk_check_button_new_with_mnemonic (_("A_dd border"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.border);
gtk_widget_show (toggle);
gimp_help_set_help_data (toggle,
_("Draw a border of spikes around the image"), NULL);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&svals.border);
g_signal_connect_swapped (toggle, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
/* colortype */
vbox = gimp_int_radio_group_new (FALSE, NULL,
G_CALLBACK (gimp_radio_button_update),
&svals.colortype, svals.colortype,
_("_Natural color"), NATURAL, &r1,
_("_Foreground color"), FOREGROUND, &r2,
_("_Background color"), BACKGROUND, &r3,
NULL);
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);
g_signal_connect_swapped (r1, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (r2, "toggled",
G_CALLBACK (gimp_preview_invalidate),
preview);
g_signal_connect_swapped (r3, "toggled",
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 gint
compute_luminosity (const guchar *pixel,
gboolean gray,
gboolean has_alpha)
{
gint pixel0, pixel1, pixel2;
if (svals.inverse)
{
pixel0 = 255 - pixel[0];
pixel1 = 255 - pixel[1];
pixel2 = 255 - pixel[2];
}
else
{
pixel0 = pixel[0];
pixel1 = pixel[1];
pixel2 = 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;
gint values[256];
gint total, sum;
gboolean gray;
gboolean has_alpha;
gint i;
gint x1, y1;
gint width, height;
/* zero out the luminosity values array */
memset (values, 0, sizeof (gint) * 256);
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return 0;
gray = gimp_drawable_is_gray (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
for (pr = gimp_pixel_rgns_register (1, &src_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
const guchar *src, *s;
gint sx, sy;
src = src_rgn.data;
for (sy = 0; sy < src_rgn.h; sy++)
{
s = src;
for (sx = 0; sx < src_rgn.w; sx++)
{
values [compute_luminosity (s, gray, has_alpha)]++;
s += src_rgn.bpp;
}
src += src_rgn.rowstride;
}
}
total = width * height;
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,
GimpPreview *preview)
{
GimpPixelRgn src_rgn, dest_rgn;
gdouble nfrac, length, inten, spike_angle;
gint cur_progress, max_progress;
gint x1, y1, x2, y2;
gint width, height;
gint threshold;
gint lum, x, y, b;
gboolean gray, has_alpha;
gint alpha;
gint bytes;
gpointer pr;
gint tile_width, tile_height;
GRand *gr;
guchar *dest_buf = NULL;
bytes = drawable->bpp;
if (preview)
{
gimp_preview_get_position (preview, &x1, &y1);
gimp_preview_get_size (preview, &width, &height);
x2 = x1 + width;
y2 = y1 + height;
dest_buf = g_new0 (guchar, width * height * bytes);
}
else
{
if (! gimp_drawable_mask_intersect (drawable->drawable_id,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
}
if (width < 1 || height < 1)
return;
gr = g_rand_new ();
if (svals.border)
{
num_sparkles = 2 * (width + height);
threshold = 255;
}
else
{
/* compute the luminosity which exceeds the luminosity threshold */
threshold = compute_lum_threshold (drawable, svals.lum_threshold);
}
gray = gimp_drawable_is_gray (drawable->drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable->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;
/* copy what is already there */
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, preview == NULL, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
const guchar *src, *s;
guchar *dest, *d;
src = src_rgn.data;
if (preview)
dest = dest_buf + (((dest_rgn.y - y1) * width) + (dest_rgn.x - x1)) * bytes;
else
dest = dest_rgn.data;
for (y = 0; y < src_rgn.h; y++)
{
s = src;
d = dest;
for (x = 0; x < src_rgn.w; x++)
{
if (has_alpha && s[alpha] == 0)
{
memset (d, 0, alpha);
}
else
{
for (b = 0; b < alpha; b++)
d[b] = s[b];
}
if (has_alpha)
d[alpha] = s[alpha];
s += src_rgn.bpp;
d += dest_rgn.bpp;
}
src += src_rgn.rowstride;
if (preview)
dest += width * bytes;
else
dest += dest_rgn.rowstride;
}
}
/* add effects to new image based on intensity of old pixels */
gimp_pixel_rgn_init (&src_rgn, drawable,
x1, y1, width, height, FALSE, FALSE);
gimp_pixel_rgn_init (&dest_rgn, drawable,
x1, y1, width, height, preview == NULL, TRUE);
for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
const guchar *src, *s;
src = src_rgn.data;
for (y = 0; y < src_rgn.h; y++)
{
s = src;
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 (s, 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;
/* fspike im x,y intens rlength angle */
if (svals.spike_pts > 0)
{
/* major spikes */
if (svals.spike_angle == -1)
spike_angle = g_rand_double_range (gr, 0, 360.0);
else
spike_angle = svals.spike_angle;
if (g_rand_double (gr) <= svals.density)
{
fspike (&src_rgn, &dest_rgn, x1, y1, x2, y2,
x + src_rgn.x, y + src_rgn.y,
tile_width, tile_height,
inten, length, spike_angle, gr, dest_buf);
/* minor spikes */
fspike (&src_rgn, &dest_rgn, 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),
gr, dest_buf);
}
}
if (!preview)
{
cur_progress ++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((double) cur_progress /
(double) max_progress);
}
}
s += src_rgn.bpp;
}
src += src_rgn.rowstride;
}
}
if (preview)
{
gimp_preview_draw_buffer (preview, dest_buf, width * bytes);
g_free (dest_buf);
}
else
{
gimp_progress_update (1.0);
/* update the sparkled region */
gimp_drawable_flush (drawable);
gimp_drawable_merge_shadow (drawable->drawable_id, TRUE);
gimp_drawable_update (drawable->drawable_id, x1, y1, width, height);
}
g_rand_free (gr);
}
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],
guchar *dest_buf)
{
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)
{
if (dest_buf)
pixel = dest_buf + ((y - y1) * (x2 - x1) + (x - x1)) * bytes;
else
{
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.inverse)
new = 255 - pixel[b];
else
new = pixel[b];
if (svals.preserve_luminosity)
{
if (new < color[b])
{
new *= (1.0 - val * (1.0 - svals.transparency));
}
else
{
new -= val * color[b] * (1.0 - svals.transparency);
if (new < 0.0)
new = 0.0;
}
}
new *= 1.0 - val * svals.transparency;
new += val * color[b];
if (new > 255)
new = 255;
if (svals.inverse)
pixel[b] = 255 - new;
else
pixel[b] = new;
}
}
return tile;
}
static void
fspike (GimpPixelRgn *src_rgn,
GimpPixelRgn *dest_rgn,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gint tile_width,
gint tile_height,
gdouble inten,
gdouble length,
gdouble angle,
GRand *gr,
guchar *dest_buf)
{
const gdouble efac = 2.0;
gdouble xrt, yrt, dx, dy;
gdouble rpos;
gdouble in;
gdouble theta;
gdouble sfac;
GimpTile *tile = NULL;
gint row, col;
gint i;
gint bytes;
gboolean ok;
GimpRGB gimp_color;
guchar pixel[MAX_CHANNELS];
guchar chosen_color[MAX_CHANNELS];
guchar color[MAX_CHANNELS];
theta = angle;
bytes = dest_rgn->bpp;
row = -1;
col = -1;
switch (svals.colortype)
{
case NATURAL:
break;
case FOREGROUND:
gimp_context_get_foreground (&gimp_color);
gimp_rgb_get_uchar (&gimp_color, &chosen_color[0], &chosen_color[1],
&chosen_color[2]);
break;
case BACKGROUND:
gimp_context_get_background (&gimp_color);
gimp_rgb_get_uchar (&gimp_color, &chosen_color[0], &chosen_color[1],
&chosen_color[2]);
break;
}
/* draw the major spikes */
for (i = 0; i < svals.spike_pts; i++)
{
gimp_pixel_rgn_get_pixel (dest_rgn, pixel, xr, yr);
if (svals.colortype == NATURAL)
{
color[0] = pixel[0];
color[1] = pixel[1];
color[2] = pixel[2];
}
else
{
color[0] = chosen_color[0];
color[1] = chosen_color[1];
color[2] = chosen_color[2];
}
color[3] = pixel[3];
if (svals.inverse)
{
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)
{
GimpRGB rgb;
GimpHSV hsv;
rgb.r = (gdouble) (255 - color[0]) / 255.0;
rgb.g = (gdouble) (255 - color[1]) / 255.0;
rgb.b = (gdouble) (255 - color[2]) / 255.0;
gimp_rgb_to_hsv (&rgb, &hsv);
hsv.h += svals.random_hue * g_rand_double_range (gr, -0.5, 0.5);
if (hsv.h >= 1.0)
hsv.h -= 1.0;
else if (hsv.h < 0.0)
hsv.h += 1.0;
hsv.v += (svals.random_saturation *
g_rand_double_range (gr, -1.0, 1.0));
hsv.v = CLAMP (hsv.v, 0.0, 1.0);
gimp_hsv_to_rgb (&hsv, &rgb);
color[0] = 255 - ROUND (rgb.r * 255.0);
color[1] = 255 - ROUND (rgb.g * 255.0);
color[2] = 255 - ROUND (rgb.b * 255.0);
}
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, dest_buf);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2,
xrt + 1.0, yrt, tile_width, tile_height,
&row, &col, bytes, in, color, dest_buf);
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, dest_buf);
tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2,
xrt, yrt + 1.0, tile_width, tile_height,
&row, &col, bytes, in, color, dest_buf);
xrt += dx;
yrt += dy;
rpos += 0.2;
} while (ok);
theta += 360.0 / svals.spike_pts;
}
if (tile)
gimp_tile_unref (tile, TRUE);
}
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