Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1189 insertions, 0 deletions

diff --git a/plug-ins/common/sparkle.c b/plug-ins/common/sparkle.c
new file mode 100644
index 0000000..6af5044
--- /dev/null
+++ b/plug-ins/common/sparkle.c
@@ -0,0 +1,1189 @@
+/* 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        (gint32        drawable_ID);
+
+static gint      compute_luminosity    (const guchar *pixel,
+                                        gboolean      gray,
+                                        gboolean      has_alpha);
+static gint      compute_lum_threshold (gint32        drawable_ID,
+                                        gdouble       percentile);
+static void      sparkle               (gint32        drawable_ID,
+                                        GimpPreview  *preview);
+static void      sparkle_preview       (gpointer      drawable_ID,
+                                        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);
+
+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];
+  GimpRunMode        run_mode;
+  gint32             drawable_ID;
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+  gint               x, y, w, h;
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  *nreturn_vals = 1;
+  *return_vals  = values;
+
+  values[0].type          = GIMP_PDB_STATUS;
+  values[0].data.d_status = status;
+
+  run_mode    = param[0].data.d_int32;
+  drawable_ID = param[2].data.d_drawable;
+
+  if (! gimp_drawable_mask_intersect (drawable_ID, &x, &y, &w, &h))
+    {
+      g_message (_("Region selected for filter is empty"));
+      return;
+    }
+
+  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_ID))
+        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_ID) ||
+      gimp_drawable_is_gray (drawable_ID))
+    {
+      gimp_progress_init (_("Sparkling"));
+
+      sparkle (drawable_ID, 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;
+}
+
+static gboolean
+sparkle_dialog (gint32 drawable_ID)
+{
+  GtkWidget *dialog;
+  GtkWidget *main_vbox;
+  GtkWidget *preview;
+  GtkWidget *vbox;
+  GtkWidget *hbox;
+  GtkWidget *table;
+  GtkWidget *toggle;
+  GtkWidget *r1, *r2, *r3;
+  GtkObject *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);
+
+  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
+                                           GTK_RESPONSE_OK,
+                                           GTK_RESPONSE_CANCEL,
+                                           -1);
+
+  gimp_window_set_transient (GTK_WINDOW (dialog));
+
+  main_vbox = gtk_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_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_preview),
+                            GINT_TO_POINTER (drawable_ID));
+
+  table = gtk_table_new (9, 3, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
+  gtk_widget_show (table);
+
+  scale_data =
+    gimp_scale_entry_new (GTK_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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_TABLE (table), 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 (gint32  drawable_ID,
+                       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_ID,
+                                      &x1, &y1, &width, &height))
+    return 0;
+
+  gray = gimp_drawable_is_gray (drawable_ID);
+  has_alpha = gimp_drawable_has_alpha (drawable_ID);
+
+  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_ID);
+
+  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 (gint32       drawable_ID,
+         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_ID);
+  has_alpha = gimp_drawable_has_alpha (drawable_ID);
+
+  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_ID,
+                                          &x1, &y1, &width, &height))
+        return;
+
+      x2 = x1 + width;
+      y2 = y1 + height;
+    }
+
+  if (width < 1 || height < 1)
+    return;
+
+  d_width  = gimp_drawable_width  (drawable_ID);
+  d_height = gimp_drawable_height (drawable_ID);
+
+  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_ID, 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_ID);
+  dest_buffer = gimp_drawable_get_shadow_buffer (drawable_ID);
+
+  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_ID, TRUE);
+      gimp_drawable_update (drawable_ID, x1, y1, width, height);
+    }
+
+  g_rand_free (gr);
+}
+
+static void
+sparkle_preview (gpointer     drawable_ID,
+                 GimpPreview *preview)
+{
+  sparkle (GPOINTER_TO_INT (drawable_ID), 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           r, g, b;
+  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)
+        {
+          r = 255 - color[0];
+          g = 255 - color[1];
+          b = 255 - color[2];
+
+          gimp_rgb_to_hsv_int (&r, &g, &b);
+
+          r += svals.random_hue * g_rand_double_range (gr, -0.5, 0.5) * 255;
+
+          if (r >= 255)
+            r -= 255;
+          else if (r < 0)
+            r += 255;
+
+          b += (svals.random_saturation *
+                g_rand_double_range (gr, -1.0, 1.0)) * 255;
+
+          if (b > 255)
+            b = 255;
+
+          gimp_hsv_to_rgb_int (&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;
+
+          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;
+    }
+}