/* 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 .
*
* 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
#include
#include
#include "libgimp/stdplugins-intl.h"
#define PLUG_IN_PROC "plug-in-sparkle"
#define PLUG_IN_BINARY "sparkle"
#define PLUG_IN_ROLE "gimp-sparkle"
#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;
typedef struct _Sparkle Sparkle;
typedef struct _SparkleClass SparkleClass;
struct _Sparkle
{
GimpPlugIn parent_instance;
};
struct _SparkleClass
{
GimpPlugInClass parent_class;
};
#define SPARKLE_TYPE (sparkle_get_type ())
#define SPARKLE (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SPARKLE_TYPE, Sparkle))
GType sparkle_get_type (void) G_GNUC_CONST;
static GList * sparkle_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * sparkle_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * sparkle_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data);
static gboolean sparkle_dialog (GimpDrawable *drawable);
static void sparkle_scale_entry_update_double (GimpLabelSpin *entry,
gdouble *value);
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 sparkle_preview (GimpDrawable *drawable,
GimpPreview *preview);
static void fspike (GeglBuffer *src_buffer,
GeglBuffer *dest_buffer,
const Babl *format,
gint bytes,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
gdouble inten,
gdouble length,
gdouble angle,
GRand *gr,
guchar *dest_buf);
static void rpnt (GeglBuffer *dest_buffer,
const Babl *format,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS],
guchar *dest_buf);
G_DEFINE_TYPE (Sparkle, sparkle, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (SPARKLE_TYPE)
DEFINE_STD_SET_I18N
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;
static void
sparkle_class_init (SparkleClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = sparkle_query_procedures;
plug_in_class->create_procedure = sparkle_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
sparkle_init (Sparkle *sparkle)
{
}
static GList *
sparkle_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
sparkle_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
sparkle_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "RGB*, GRAY*");
gimp_procedure_set_sensitivity_mask (procedure,
GIMP_PROCEDURE_SENSITIVE_DRAWABLE);
gimp_procedure_set_menu_label (procedure, N_("_Sparkle..."));
gimp_procedure_add_menu_path (procedure,
"/Filters/Light and Shadow/Light");
gimp_procedure_set_documentation (procedure,
N_("Turn bright spots into "
"starry sparkles"),
"Uses a percentage based luminoisty "
"threhsold to find candidate pixels "
"for adding some sparkles (spikes).",
name);
gimp_procedure_set_attribution (procedure,
"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");
GIMP_PROC_ARG_DOUBLE (procedure, "lum-threshold",
"Lum threshold",
"Luminosity threshold",
0.0, 1.0, 0.001,
G_PARAM_READWRITE);
GIMP_PROC_ARG_DOUBLE (procedure, "flare-inten",
"Flare inten",
"Flare intensity",
0.0, 1.0, 0.5,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "spike-len",
"Spike len",
"Spike length (in pixels)",
1, 1000, 20,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "spike-points",
"Spike points",
"# of spike points",
1, 1000, 4,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "spike-angle",
"Spike angle",
"Spike angle (-1: random)",
-1, 360, 15,
G_PARAM_READWRITE);
GIMP_PROC_ARG_DOUBLE (procedure, "density",
"Density",
"Spike density",
0.0, 1.0, 1.0,
G_PARAM_READWRITE);
GIMP_PROC_ARG_DOUBLE (procedure, "transparency",
"Transparency",
"Transparency",
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
GIMP_PROC_ARG_DOUBLE (procedure, "random-hue",
"Random hue",
"Random hue",
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
GIMP_PROC_ARG_DOUBLE (procedure, "random-saturation",
"Random saturation",
"Random saturation",
0.0, 1.0, 0.0,
G_PARAM_READWRITE);
GIMP_PROC_ARG_BOOLEAN (procedure, "preserve-luminosity",
"Preserve luminosity",
"Preserve luminosity",
FALSE,
G_PARAM_READWRITE);
GIMP_PROC_ARG_BOOLEAN (procedure, "inverse",
"Inverse",
"Inverse",
FALSE,
G_PARAM_READWRITE);
GIMP_PROC_ARG_BOOLEAN (procedure, "border",
"Border",
"Add border",
FALSE,
G_PARAM_READWRITE);
GIMP_PROC_ARG_INT (procedure, "color-type",
"Color type",
"Color of sparkles: { NATURAL (0), "
"FOREGROUND (1), BACKGROUND (2) }",
0, 2, NATURAL,
G_PARAM_READWRITE);
}
return procedure;
}
static GimpValueArray *
sparkle_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
gint n_drawables,
GimpDrawable **drawables,
const GimpValueArray *args,
gpointer run_data)
{
GimpDrawable *drawable;
gint x, y, w, h;
gegl_init (NULL, NULL);
if (n_drawables != 1)
{
GError *error = NULL;
g_set_error (&error, GIMP_PLUG_IN_ERROR, 0,
_("Procedure '%s' only works with one drawable."),
PLUG_IN_PROC);
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CALLING_ERROR,
error);
}
else
{
drawable = drawables[0];
}
if (! gimp_drawable_mask_intersect (drawable, &x, &y, &w, &h))
{
g_message (_("Region selected for filter is empty"));
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_SUCCESS,
NULL);
}
switch (run_mode)
{
case GIMP_RUN_INTERACTIVE:
gimp_get_data (PLUG_IN_PROC, &svals);
if (! sparkle_dialog (drawable))
{
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_CANCEL,
NULL);
}
break;
case GIMP_RUN_NONINTERACTIVE:
svals.lum_threshold = GIMP_VALUES_GET_DOUBLE (args, 0);
svals.flare_inten = GIMP_VALUES_GET_DOUBLE (args, 1);
svals.spike_len = GIMP_VALUES_GET_INT (args, 2);
svals.spike_pts = GIMP_VALUES_GET_INT (args, 3);
svals.spike_angle = GIMP_VALUES_GET_INT (args, 4);
svals.density = GIMP_VALUES_GET_DOUBLE (args, 5);
svals.transparency = GIMP_VALUES_GET_DOUBLE (args, 6);
svals.random_hue = GIMP_VALUES_GET_DOUBLE (args, 7);
svals.random_saturation = GIMP_VALUES_GET_DOUBLE (args, 8);
svals.preserve_luminosity = GIMP_VALUES_GET_BOOLEAN (args, 9);
svals.inverse = GIMP_VALUES_GET_BOOLEAN (args, 10);
svals.border = GIMP_VALUES_GET_BOOLEAN (args, 11);
svals.colortype = GIMP_VALUES_GET_INT (args, 12);
break;
case GIMP_RUN_WITH_LAST_VALS:
gimp_get_data (PLUG_IN_PROC, &svals);
break;
}
if (gimp_drawable_is_rgb (drawable) ||
gimp_drawable_is_gray (drawable))
{
gimp_progress_init (_("Sparkling"));
sparkle (drawable, NULL);
if (run_mode != GIMP_RUN_NONINTERACTIVE)
gimp_displays_flush ();
if (run_mode == GIMP_RUN_INTERACTIVE)
gimp_set_data (PLUG_IN_PROC, &svals, sizeof (SparkleVals));
}
else
{
return gimp_procedure_new_return_values (procedure,
GIMP_PDB_EXECUTION_ERROR,
NULL);
}
return gimp_procedure_new_return_values (procedure, GIMP_PDB_SUCCESS, NULL);
}
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;
GtkWidget *scale;
gboolean run;
gimp_ui_init (PLUG_IN_BINARY);
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 (drawable);
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_preview),
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 = gimp_scale_entry_new (_("Luminosity _threshold:"), svals.lum_threshold, 0.0, 0.1, 3);
gimp_help_set_help_data (scale, _("Adjust the luminosity threshold"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.lum_threshold);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 0, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("F_lare intensity:"), svals.flare_inten, 0.0, 1.0, 2);
gimp_help_set_help_data (scale, _("Adjust the flare intensity"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.flare_inten);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 1, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("_Spike length:"), svals.spike_len, 1, 100, 0);
gimp_help_set_help_data (scale, _("Adjust the spike length"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.spike_len);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 2, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("Sp_ike points:"), svals.spike_pts, 0, 16, 0);
gimp_help_set_help_data (scale, _("Adjust the number of spikes"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.spike_pts);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 3, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("Spi_ke angle (-1: random):"), svals.spike_angle, -1, 360, 0);
gimp_help_set_help_data (scale, _("Adjust the spike angle "
"(-1 causes a random angle to be chosen)"), NULL);
gimp_label_spin_set_increments (GIMP_LABEL_SPIN (scale), 1.0, 15.0);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.spike_angle);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 4, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("Spik_e density:"), svals.density, 0.0, 1.0, 2);
gimp_help_set_help_data (scale, _("Adjust the spike density"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.density);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 5, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("Tr_ansparency:"), svals.transparency, 0.0, 1.0, 2);
gimp_help_set_help_data (scale, _("Adjust the opacity of the spikes"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.transparency);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 6, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("_Random hue:"), svals.random_hue, 0.0, 1.0, 2);
gimp_help_set_help_data (scale, _("Adjust how much the hue should be changed randomly"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.random_hue);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 7, 3, 1);
gtk_widget_show (scale);
scale = gimp_scale_entry_new (_("Rando_m saturation:"), svals.random_saturation, 0.0, 1.0, 2);
gimp_help_set_help_data (scale, _("Adjust how much the saturation should be changed randomly"), NULL);
g_signal_connect (scale, "value-changed",
G_CALLBACK (sparkle_scale_entry_update_double),
&svals.random_saturation);
g_signal_connect_swapped (scale, "value-changed",
G_CALLBACK (gimp_preview_invalidate),
preview);
gtk_grid_attach (GTK_GRID (grid), scale, 0, 8, 3, 1);
gtk_widget_show (scale);
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, NULL, 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 void
sparkle_scale_entry_update_double (GimpLabelSpin *entry,
gdouble *value)
{
*value = gimp_label_spin_get_value (entry);
}
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)
{
GeglBuffer *src_buffer;
GeglBufferIterator *iter;
const Babl *format;
gint bpp;
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,
&x1, &y1, &width, &height))
return 0;
gray = gimp_drawable_is_gray (drawable);
has_alpha = gimp_drawable_has_alpha (drawable);
if (gray)
{
if (has_alpha)
format = babl_format ("Y'A u8");
else
format = babl_format ("Y' u8");
}
else
{
if (has_alpha)
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
bpp = babl_format_get_bytes_per_pixel (format);
src_buffer = gimp_drawable_get_buffer (drawable);
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 1);
while (gegl_buffer_iterator_next (iter))
{
const guchar *src = iter->items[0].data;
gint length = iter->length;
while (length--)
{
values [compute_luminosity (src, gray, has_alpha)]++;
src += bpp;
}
}
g_object_unref (src_buffer);
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)
{
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
GeglBufferIterator *iter;
const Babl *format;
gint d_width, d_height;
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;
GRand *gr;
guchar *dest_buf = NULL;
gray = gimp_drawable_is_gray (drawable);
has_alpha = gimp_drawable_has_alpha (drawable);
if (gray)
{
if (has_alpha)
format = babl_format ("Y'A u8");
else
format = babl_format ("Y' u8");
}
else
{
if (has_alpha)
format = babl_format ("R'G'B'A u8");
else
format = babl_format ("R'G'B' u8");
}
bytes = babl_format_get_bytes_per_pixel (format);
alpha = (has_alpha) ? bytes - 1 : bytes;
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,
&x1, &y1, &width, &height))
return;
x2 = x1 + width;
y2 = y1 + height;
}
if (width < 1 || height < 1)
return;
d_width = gimp_drawable_get_width (drawable);
d_height = gimp_drawable_get_height (drawable);
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);
}
/* initialize the progress dialog */
cur_progress = 0;
max_progress = num_sparkles;
/* copy what is already there */
src_buffer = gimp_drawable_get_buffer (drawable);
dest_buffer = gimp_drawable_get_shadow_buffer (drawable);
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
gegl_buffer_iterator_add (iter, dest_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[0].roi;
const guchar *src, *s;
guchar *dest, *d;
src = iter->items[0].data;
if (preview)
dest = dest_buf + (((roi.y - y1) * width) + (roi.x - x1)) * bytes;
else
dest = iter->items[1].data;
for (y = 0; y < roi.height; y++)
{
s = src;
d = dest;
for (x = 0; x < roi.width; 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 += bytes;
d += bytes;
}
src += roi.width * bytes;
if (preview)
dest += width * bytes;
else
dest += roi.width * bytes;
}
}
/* add effects to new image based on intensity of old pixels */
iter = gegl_buffer_iterator_new (src_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_READ, GEGL_ABYSS_NONE, 2);
gegl_buffer_iterator_add (iter, dest_buffer,
GEGL_RECTANGLE (x1, y1, width, height), 0,
format,
GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE);
while (gegl_buffer_iterator_next (iter))
{
GeglRectangle roi = iter->items[0].roi;
const guchar *src, *s;
src = iter->items[0].data;
for (y = 0; y < roi.height; y++)
{
s = src;
for (x = 0; x < roi.width; x++)
{
if (svals.border)
{
if (x + roi.x == 0 ||
y + roi.y == 0 ||
x + roi.x == d_width - 1 ||
y + roi.y == d_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_buffer, dest_buffer, format, bytes,
x1, y1, x2, y2,
x + roi.x, y + roi.y,
inten, length, spike_angle, gr, dest_buf);
/* minor spikes */
fspike (src_buffer, dest_buffer, format, bytes,
x1, y1, x2, y2,
x + roi.x, y + roi.y,
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 += bytes;
}
src += roi.width * bytes;
}
}
g_object_unref (src_buffer);
g_object_unref (dest_buffer);
if (preview)
{
gimp_preview_draw_buffer (preview, dest_buf, width * bytes);
g_free (dest_buf);
}
else
{
gimp_progress_update (1.0);
gimp_drawable_merge_shadow (drawable, TRUE);
gimp_drawable_update (drawable, x1, y1, width, height);
}
g_rand_free (gr);
}
static void
sparkle_preview (GimpDrawable *drawable,
GimpPreview *preview)
{
sparkle (drawable, preview);
}
static inline void
rpnt (GeglBuffer *dest_buffer,
const Babl *format,
gint x1,
gint y1,
gint x2,
gint y2,
gdouble xr,
gdouble yr,
gint bytes,
gdouble inten,
guchar color[MAX_CHANNELS],
guchar *dest_buf)
{
gint x, y, b;
gdouble dx, dy, rs, val;
guchar *pixel;
guchar pixel_buf[4];
gdouble new;
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
{
gegl_buffer_sample (dest_buffer, x, y, NULL,
pixel_buf, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
pixel = pixel_buf;
}
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;
}
if (! dest_buf)
gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x, y, 1, 1), 0,
format, pixel_buf,
GEGL_AUTO_ROWSTRIDE);
}
}
static void
fspike (GeglBuffer *src_buffer,
GeglBuffer *dest_buffer,
const Babl *format,
gint bytes,
gint x1,
gint y1,
gint x2,
gint y2,
gint xr,
gint yr,
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;
gint i;
gboolean ok;
GimpRGB gimp_color;
guchar pixel[MAX_CHANNELS];
guchar chosen_color[MAX_CHANNELS];
guchar color[MAX_CHANNELS];
theta = angle;
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++)
{
gegl_buffer_sample (dest_buffer, xr, yr, NULL, pixel, format,
GEGL_SAMPLER_NEAREST, GEGL_ABYSS_NONE);
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;
rpnt (dest_buffer, format, x1, y1, x2, y2,
xrt, yrt,
bytes, in, color, dest_buf);
rpnt (dest_buffer, format, x1, y1, x2, y2,
xrt + 1.0, yrt,
bytes, in, color, dest_buf);
rpnt (dest_buffer, format, x1, y1, x2, y2,
xrt + 1.0, yrt + 1.0,
bytes, in, color, dest_buf);
rpnt (dest_buffer, format, x1, y1, x2, y2,
xrt, yrt + 1.0,
bytes, in, color, dest_buf);
xrt += dx;
yrt += dy;
rpos += 0.2;
} while (ok);
theta += 360.0 / svals.spike_pts;
}
}