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-
- /* Sparkle --- image filter plug-in for The Gimp image manipulation program
- * Copyright (C) 1996 by John Beale; ported to Gimp by Michael J. Hammel;
- * It has been optimized a little, bugfixed and modified by Martin Weber
- * for additional functionality.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * You can contact Michael at mjhammel@csn.net
- * You can contact Martin at martweb@gmx.net
- * Note: set tabstops to 3 to make this more readable.
- */
-
- /*
- * Sparkle 1.26 - simulate pixel bloom and diffraction effects
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include <gtk/gtk.h>
-
- #include <libgimp/gimp.h>
- #include <libgimp/gimpui.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- #define SCALE_WIDTH 175
- #define MAX_CHANNELS 4
- #define PSV 2 /* point spread value */
- #define EPSILON 0.001
-
- #define NATURAL 0
- #define FOREGROUND 1
- #define BACKGROUND 2
-
- typedef struct
- {
- gdouble lum_threshold;
- gdouble flare_inten;
- gdouble spike_len;
- gdouble spike_pts;
- gdouble spike_angle;
- gdouble density;
- gdouble opacity;
- gdouble random_hue;
- gdouble random_saturation;
- gint preserve_luminosity;
- gint invers;
- gint border;
- gint colortype;
- } SparkleVals;
-
- typedef struct
- {
- gint run;
- } SparkleInterface;
-
- /* Declare local functions.
- */
-
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals);
-
- static gint sparkle_dialog (void);
- static void sparkle_ok_callback (GtkWidget *widget,
- gpointer data);
-
- static gint compute_luminosity (guchar *pixel,
- gint gray,
- gint has_alpha);
- static gint compute_lum_threshold (GimpDrawable *drawable,
- gdouble percentile);
- static void sparkle (GimpDrawable *drawable,
- gint threshold);
- static void fspike (GimpPixelRgn *src_rgn,
- GimpPixelRgn *dest_rgn,
- gint gray,
- gint x1,
- gint y1,
- gint x2,
- gint y2,
- gint xr,
- gint yr,
- gint tile_width,
- gint tile_height,
- gdouble inten,
- gdouble length,
- gdouble angle);
- static GimpTile* rpnt (GimpDrawable *drawable,
- GimpTile *tile,
- gint x1,
- gint y1,
- gint x2,
- gint y2,
- gdouble xr,
- gdouble yr,
- gint tile_width,
- gint tile_height,
- gint *row,
- gint *col,
- gint bytes,
- gdouble inten,
- guchar color[MAX_CHANNELS]);
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run, /* run_proc */
- };
-
- static SparkleVals svals =
- {
- 0.001, /* luminosity threshold */
- 0.5, /* flare intensity */
- 20.0, /* spike length */
- 4.0, /* spike points */
- 15.0, /* spike angle */
- 1.0, /* spike density */
- 0.0, /* opacity */
- 0.0, /* random hue */
- 0.0, /* random saturation */
- FALSE, /* preserve_luminosity */
- FALSE, /* invers */
- FALSE, /* border */
- NATURAL /* colortype */
- };
-
- static SparkleInterface sint =
- {
- FALSE /* run */
- };
-
- static gint num_sparkles;
-
-
- MAIN ()
-
- static void
- query (void)
- {
- static GimpParamDef args[] =
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
- { GIMP_PDB_IMAGE, "image", "Input image (unused)" },
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
- { GIMP_PDB_FLOAT, "lum_threshold", "Luminosity threshold (0.0 - 1.0)" },
- { GIMP_PDB_FLOAT, "flare_inten", "Flare intensity (0.0 - 1.0)" },
- { GIMP_PDB_INT32, "spike_len", "Spike length (in pixels)" },
- { GIMP_PDB_INT32, "spike_pts", "# of spike points" },
- { GIMP_PDB_INT32, "spike_angle", "Spike angle (0-360 degrees, -1: random)" },
- { GIMP_PDB_FLOAT, "density", "Spike density (0.0 - 1.0)" },
- { GIMP_PDB_FLOAT, "opacity", "Opacity (0.0 - 1.0)" },
- { GIMP_PDB_FLOAT, "random_hue", "Random hue (0.0 - 1.0)" },
- { GIMP_PDB_FLOAT, "random_saturation", "Random saturation (0.0 - 1.0)" },
- { GIMP_PDB_INT32, "preserve_luminosity", "Preserve luminosity (TRUE/FALSE)" },
- { GIMP_PDB_INT32, "invers", "Invers (TRUE/FALSE)" },
- { GIMP_PDB_INT32, "border", "Add border (TRUE/FALSE)" },
- { GIMP_PDB_INT32, "colortype", "Color of sparkles: { NATURAL (0), FOREGROUND (1), BACKGROUND (2) }" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure ("plug_in_sparkle",
- "Simulates pixel bloom and diffraction effects",
- "No help yet",
- "John Beale, & (ported to GIMP v0.54) Michael J. Hammel & ted to GIMP v1.0) Spencer Kimball",
- "John Beale",
- "Version 1.26, December 1998",
- N_("<Image>/Filters/Light Effects/Sparkle..."),
- "RGB*, GRAY*",
- GIMP_PLUGIN,
- nargs, 0,
- args, NULL);
- }
-
- static void
- run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals)
- {
- static GimpParam values[1];
- GimpDrawable *drawable;
- GimpRunModeType run_mode;
- GimpPDBStatusType status = GIMP_PDB_SUCCESS;
- gint threshold, x1, y1, x2, y2;
-
- run_mode = param[0].data.d_int32;
-
- *nreturn_vals = 1;
- *return_vals = values;
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- switch (run_mode)
- {
- case GIMP_RUN_INTERACTIVE:
- INIT_I18N_UI();
- /* Possibly retrieve data */
- gimp_get_data ("plug_in_sparkle", &svals);
-
- /* First acquire information with a dialog */
- if (! sparkle_dialog ())
- return;
- break;
-
- case GIMP_RUN_NONINTERACTIVE:
- INIT_I18N();
- /* Make sure all the arguments are there! */
- if (nparams != 16)
- {
- status = GIMP_PDB_CALLING_ERROR;
- }
- else
- {
- svals.lum_threshold = param[3].data.d_float;
- svals.flare_inten = param[4].data.d_float;
- svals.spike_len = param[5].data.d_int32;
- svals.spike_pts = param[6].data.d_int32;
- svals.spike_angle = param[7].data.d_int32;
- svals.density = param[8].data.d_float;
- svals.opacity = param[9].data.d_float;
- svals.random_hue = param[10].data.d_float;
- svals.random_saturation = param[11].data.d_float;
- svals.preserve_luminosity = (param[12].data.d_int32) ? TRUE : FALSE;
- svals.invers = (param[13].data.d_int32) ? TRUE : FALSE;
- svals.border = (param[14].data.d_int32) ? TRUE : FALSE;
- svals.colortype = param[15].data.d_int32;
-
- if (svals.lum_threshold < 0.0 || svals.lum_threshold > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.flare_inten < 0.0 || svals.flare_inten > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.spike_len < 0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.spike_pts < 0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.spike_angle < -1 || svals.spike_angle > 360)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.density < 0.0 || svals.density > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.opacity < 0.0 || svals.opacity > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.random_hue < 0.0 || svals.random_hue > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.random_saturation < 0.0 ||
- svals.random_saturation > 1.0)
- status = GIMP_PDB_CALLING_ERROR;
- else if (svals.colortype < NATURAL || svals.colortype > BACKGROUND)
- status = GIMP_PDB_CALLING_ERROR;
- }
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- INIT_I18N();
- /* Possibly retrieve data */
- gimp_get_data ("plug_in_sparkle", &svals);
- break;
-
- default:
- break;
- }
-
- /* Get the specified drawable */
- drawable = gimp_drawable_get (param[2].data.d_drawable);
-
- /* Make sure that the drawable is gray or RGB color */
- if (gimp_drawable_is_rgb (drawable->id) ||
- gimp_drawable_is_gray (drawable->id))
- {
- gimp_progress_init (_("Sparkling..."));
- gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
-
- if (svals.border == FALSE)
- /* compute the luminosity which exceeds the luminosity threshold */
- threshold = compute_lum_threshold (drawable, svals.lum_threshold);
- else
- {
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
- num_sparkles = 2 * (x2 - x1 + y2 - y1);
- threshold = 255;
- }
-
- sparkle (drawable, threshold);
-
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
-
- /* Store mvals data */
- if (run_mode == GIMP_RUN_INTERACTIVE)
- gimp_set_data ("plug_in_sparkle", &svals, sizeof (SparkleVals));
- }
- else
- {
- /* gimp_message ("sparkle: cannot operate on indexed color images"); */
- status = GIMP_PDB_EXECUTION_ERROR;
- }
-
- values[0].data.d_status = status;
-
- gimp_drawable_detach (drawable);
- }
-
- static gint
- sparkle_dialog (void)
- {
- GtkWidget *dlg;
- GtkWidget *main_vbox;
- GtkWidget *vbox;
- GtkWidget *hbox;
- GtkWidget *frame;
- GtkWidget *table;
- GtkWidget *toggle;
- GtkWidget *sep;
- GtkWidget *r1, *r2, *r3;
- GtkObject *scale_data;
-
- gimp_ui_init ("sparkle", FALSE);
-
- dlg = gimp_dialog_new (_("Sparkle"), "sparkle",
- gimp_standard_help_func, "filters/sparkle.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
-
- _("OK"), sparkle_ok_callback,
- NULL, NULL, NULL, TRUE, FALSE,
- _("Cancel"), gtk_widget_destroy,
- NULL, 1, NULL, FALSE, TRUE,
-
- NULL);
-
- gtk_signal_connect (GTK_OBJECT (dlg), "destroy",
- GTK_SIGNAL_FUNC (gtk_main_quit),
- NULL);
-
- gimp_help_init ();
-
- /* parameter settings */
- frame = gtk_frame_new (_("Parameter Settings"));
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
- gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), frame, TRUE, TRUE, 0);
- gtk_widget_show (frame);
-
- main_vbox = gtk_vbox_new (FALSE, 4);
- gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 4);
- gtk_container_add (GTK_CONTAINER (frame), main_vbox);
- gtk_widget_show (main_vbox);
-
- table = gtk_table_new (9, 3, FALSE);
- gtk_table_set_col_spacings (GTK_TABLE (table), 4);
- gtk_table_set_row_spacings (GTK_TABLE (table), 2);
- gtk_box_pack_start (GTK_BOX (main_vbox), table, FALSE, FALSE, 0);
- gtk_widget_show (table);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
- _("Luminosity Threshold:"), SCALE_WIDTH, 0,
- svals.lum_threshold, 0.0, 0.1, 0.001, 0.01, 3,
- TRUE, 0, 0,
- _("Adjust the Luminosity Threshold"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.lum_threshold);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 1,
- _("Flare Intensity:"), SCALE_WIDTH, 0,
- svals.flare_inten, 0.0, 1.0, 0.01, 0.1, 2,
- TRUE, 0, 0,
- _("Adjust the Flare Intensity"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.flare_inten);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 2,
- _("Spike Length:"), SCALE_WIDTH, 0,
- svals.spike_len, 1, 100, 1, 10, 0,
- TRUE, 0, 0,
- _("Adjust the Spike Length"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.spike_len);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 3,
- _("Spike Points:"), SCALE_WIDTH, 0,
- svals.spike_pts, 0, 16, 1, 4, 0,
- TRUE, 0, 0,
- _("Adjust the Number of Spikes"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.spike_pts);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 4,
- _("Spike Angle (-1: Random):"), SCALE_WIDTH, 0,
- svals.spike_angle, -1, 360, 1, 15, 0,
- TRUE, 0, 0,
- _("Adjust the Spike Angle "
- "(-1 means a Random Angle is choosen)"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.spike_angle);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 5,
- _("Spike Density:"), SCALE_WIDTH, 0,
- svals.density, 0.0, 1.0, 0.01, 0.1, 2,
- TRUE, 0, 0,
- _("Adjust the Spike Density"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.density);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 6,
- _("Opacity:"), SCALE_WIDTH, 0,
- svals.opacity, 0.0, 1.0, 0.01, 0.1, 2,
- TRUE, 0, 0,
- _("Adjust the Opacity of the Spikes"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.opacity);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 7,
- _("Random Hue:"), SCALE_WIDTH, 0,
- svals.random_hue, 0.0, 1.0, 0.01, 0.1, 2,
- TRUE, 0, 0,
- _("Adjust the Value how much the Hue should "
- "be changed randomly"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.random_hue);
-
- scale_data =
- gimp_scale_entry_new (GTK_TABLE (table), 0, 8,
- _("Random Saturation:"), SCALE_WIDTH, 0,
- svals.random_saturation, 0.0, 1.0, 0.01, 0.1, 2,
- TRUE, 0, 0,
- _("Adjust the Value how much the Saturation should "
- "be changed randomly"), NULL);
- gtk_signal_connect (GTK_OBJECT (scale_data), "value_changed",
- GTK_SIGNAL_FUNC (gimp_double_adjustment_update),
- &svals.random_saturation);
-
- sep = gtk_hseparator_new ();
- gtk_box_pack_start (GTK_BOX (main_vbox), sep, FALSE, FALSE, 0);
- gtk_widget_show (sep);
-
- hbox = gtk_hbox_new (FALSE, 4);
- gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
- gtk_widget_show (hbox);
-
- vbox = gtk_vbox_new (FALSE, 1);
- gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
- gtk_widget_show (vbox);
-
- toggle = gtk_check_button_new_with_label (_("Preserve Luminosity"));
- gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle),
- svals.preserve_luminosity);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &svals.preserve_luminosity);
- gtk_widget_show (toggle);
- gimp_help_set_help_data (toggle, _("Should the Luminosity be preserved?"),
- NULL);
-
- toggle = gtk_check_button_new_with_label (_("Inverse"));
- gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.invers);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &svals.invers);
- gtk_widget_show (toggle);
- gimp_help_set_help_data (toggle, _("Should an Inverse Effect be done?"), NULL);
-
- toggle = gtk_check_button_new_with_label (_("Add Border"));
- gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), svals.border);
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (gimp_toggle_button_update),
- &svals.border);
- gtk_widget_show (toggle);
- gimp_help_set_help_data (toggle,
- _("Draw a Border of Spikes around the Image"),
- NULL);
-
- sep = gtk_vseparator_new ();
- gtk_box_pack_start (GTK_BOX (hbox), sep, FALSE, FALSE, 0);
- gtk_widget_show (sep);
-
- /* colortype */
- vbox =
- gimp_radio_group_new2 (FALSE, NULL,
- gimp_radio_button_update,
- &svals.colortype, (gpointer) svals.colortype,
-
- _("Natural Color"), (gpointer) NATURAL, &r1,
- _("Foreground Color"), (gpointer) FOREGROUND, &r2,
- _("Background Color"), (gpointer) BACKGROUND, &r3,
-
- NULL);
- gtk_container_set_border_width (GTK_CONTAINER (vbox), 0);
- gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
- gtk_widget_show (vbox);
-
- gimp_help_set_help_data (r1, _("Use the Color of the Image"), NULL);
- gimp_help_set_help_data (r2, _("Use the Foreground Color"), NULL);
- gimp_help_set_help_data (r3, _("Use the Background Color"), NULL);
-
- gtk_widget_show (dlg);
-
- gtk_main ();
- gdk_flush ();
-
- return sint.run;
- }
-
- static gint
- compute_luminosity (guchar *pixel,
- gint gray,
- gint has_alpha)
- {
- gint pixel0, pixel1, pixel2;
-
- if (svals.invers == FALSE)
- {
- pixel0 = pixel[0];
- pixel1 = pixel[1];
- pixel2 = pixel[2];
- }
- else
- {
- pixel0 = 255 - pixel[0];
- pixel1 = 255 - pixel[1];
- pixel2 = 255 - pixel[2];
- }
- if (gray)
- {
- if (has_alpha)
- return (pixel0 * pixel1) / 255;
- else
- return (pixel0);
- }
- else
- {
- gint min, max;
-
- min = MIN (pixel0, pixel1);
- min = MIN (min, pixel2);
- max = MAX (pixel0, pixel1);
- max = MAX (max, pixel2);
-
- if (has_alpha)
- return ((min + max) * pixel[3]) / 510;
- else
- return (min + max) / 2;
- }
- }
-
- static gint
- compute_lum_threshold (GimpDrawable *drawable,
- gdouble percentile)
- {
- GimpPixelRgn src_rgn;
- gpointer pr;
- guchar *data;
- gint values[256];
- gint total, sum;
- gint size;
- gint gray;
- gint has_alpha;
- gint i;
- gint x1, y1, x2, y2;
-
- /* zero out the luminosity values array */
-
- memset (values, 0, sizeof (gint) * 256);
-
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
- gray = gimp_drawable_is_gray (drawable->id);
- has_alpha = gimp_drawable_has_alpha (drawable->id);
-
- gimp_pixel_rgn_init (&src_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
-
- for (pr = gimp_pixel_rgns_register (1, &src_rgn);
- pr != NULL;
- pr = gimp_pixel_rgns_process (pr))
- {
- data = src_rgn.data;
- size = src_rgn.w * src_rgn.h;
-
- while (size--)
- {
- values [compute_luminosity (data, gray, has_alpha)]++;
- data += src_rgn.bpp;
- }
- }
-
- total = (x2 - x1) * (y2 - y1);
- sum = 0;
-
- for (i = 255; i >= 0; i--)
- {
- sum += values[i];
- if ((gdouble) sum > percentile * (gdouble) total)
- {
- num_sparkles = sum;
- return i;
- }
- }
-
- return 0;
- }
-
- static void
- sparkle (GimpDrawable *drawable,
- gint threshold)
- {
- GimpPixelRgn src_rgn, dest_rgn;
- guchar *src, *dest;
- gdouble nfrac, length, inten, spike_angle;
- gint cur_progress, max_progress;
- gint x1, y1, x2, y2;
- gint size, lum, x, y, b;
- gint gray;
- gint has_alpha, alpha;
- gpointer pr;
- guchar *tmp1;
- gint tile_width, tile_height;
-
- gimp_drawable_mask_bounds (drawable->id, &x1, &y1, &x2, &y2);
- gray = gimp_drawable_is_gray (drawable->id);
- has_alpha = gimp_drawable_has_alpha (drawable->id);
- alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp;
- tile_width = gimp_tile_width();
- tile_height = gimp_tile_height();
-
- /* initialize the progress dialog */
- cur_progress = 0;
- max_progress = num_sparkles;
-
- gimp_pixel_rgn_init (&src_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
- gimp_pixel_rgn_init (&dest_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
-
- for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
- pr != NULL;
- pr = gimp_pixel_rgns_process (pr))
- {
- src = src_rgn.data;
- dest = dest_rgn.data;
-
- size = src_rgn.w * src_rgn.h;
-
- while (size --)
- {
- if(has_alpha && src[alpha] == 0)
- {
- memset(dest, 0, alpha * sizeof(guchar));
- dest += alpha;
- }
- else
- {
- for (b = 0, tmp1 = src; b < alpha; b++)
- {
- *dest++ = *tmp1++;
- }
- }
- if (has_alpha)
- *dest++ = src[alpha];
-
- src += src_rgn.bpp;
- }
- }
-
- /* add effects to new image based on intensity of old pixels */
- gimp_pixel_rgn_init (&src_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE);
- gimp_pixel_rgn_init (&dest_rgn, drawable,
- x1, y1, (x2 - x1), (y2 - y1), TRUE, TRUE);
-
- for (pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn);
- pr != NULL;
- pr = gimp_pixel_rgns_process (pr))
- {
- src = src_rgn.data;
-
- for (y = 0; y < src_rgn.h; y++)
- for (x = 0; x < src_rgn.w; x++)
- {
- if (svals.border)
- {
- if (x + src_rgn.x == 0 || y + src_rgn.y == 0
- || x + src_rgn.x == drawable->width - 1
- || y + src_rgn.y == drawable->height - 1)
- lum = 255;
- else
- lum = 0;
- }
- else
- lum = compute_luminosity (src, gray, has_alpha);
- if (lum >= threshold)
- {
- nfrac = fabs ((gdouble) (lum + 1 - threshold) /
- (gdouble) (256 - threshold));
- length = (gdouble) svals.spike_len * (gdouble) pow (nfrac, 0.8);
- inten = svals.flare_inten * nfrac /* pow (nfrac, 1.0) */;
-
- /* fspike im x,y intens rlength angle */
- if (svals.spike_pts > 0)
- {
- /* major spikes */
- if (svals.spike_angle == -1)
- spike_angle = 360.0 * rand () / G_MAXRAND;
- else
- spike_angle = svals.spike_angle;
- if (rand() <= G_MAXRAND * svals.density)
- {
- fspike (&src_rgn, &dest_rgn, gray, x1, y1, x2, y2,
- x + src_rgn.x, y + src_rgn.y,
- tile_width, tile_height,
- inten, length, spike_angle);
- /* minor spikes */
- fspike (&src_rgn, &dest_rgn, gray, x1, y1, x2, y2,
- x + src_rgn.x, y + src_rgn.y,
- tile_width, tile_height,
- inten * 0.7, length * 0.7,
- ((gdouble) spike_angle + 180.0 / svals.spike_pts));
- }
- }
- cur_progress ++;
- if ((cur_progress % 5) == 0)
- gimp_progress_update ((double) cur_progress /
- (double) max_progress);
- }
- src += src_rgn.bpp;
- }
- }
-
- gimp_progress_update (1.0);
-
- /* update the blurred region */
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, x1, y1, (x2 - x1), (y2 - y1));
- }
-
- static inline GimpTile *
- rpnt (GimpDrawable *drawable,
- GimpTile *tile,
- gint x1,
- gint y1,
- gint x2,
- gint y2,
- gdouble xr,
- gdouble yr,
- gint tile_width,
- gint tile_height,
- gint *row,
- gint *col,
- gint bytes,
- gdouble inten,
- guchar color[MAX_CHANNELS])
- {
- gint x, y, b;
- gdouble dx, dy, rs, val;
- guchar *pixel;
- gdouble new;
- gint newcol, newrow;
- gint newcoloff, newrowoff;
-
- x = (int) (xr); /* integer coord. to upper left of real point */
- y = (int) (yr);
-
- if (x >= x1 && y >= y1 && x < x2 && y < y2)
- {
- newcol = x / tile_width;
- newcoloff = x % tile_width;
- newrow = y / tile_height;
- newrowoff = y % tile_height;
-
- if ((newcol != *col) || (newrow != *row))
- {
- *col = newcol;
- *row = newrow;
- if (tile)
- gimp_tile_unref (tile, TRUE);
- tile = gimp_drawable_get_tile (drawable, TRUE, *row, *col);
- gimp_tile_ref (tile);
- }
-
- pixel = tile->data + tile->bpp * (tile->ewidth * newrowoff + newcoloff);
- dx = xr - x; dy = yr - y;
- rs = dx * dx + dy * dy;
- val = inten * exp (-rs / PSV);
-
- for (b = 0; b < bytes; b++)
- {
- if (svals.invers == FALSE)
- new = pixel[b];
- else
- new = 255 - pixel[b];
-
- if (svals.preserve_luminosity==TRUE)
- {
- if (new < color[b])
- new *= (1.0 - val * (1.0 - svals.opacity));
- else
- {
- new -= val * color[b] * (1.0 - svals.opacity);
- if (new < 0.0)
- new = 0.0;
-
- }
- }
- new *= 1.0 - val * svals.opacity;
- new += val * color[b];
-
- if (new > 255) new = 255;
-
- if (svals.invers != FALSE)
- pixel[b] = 255 - new;
- else
- pixel[b] = new;
- }
- }
-
- return tile;
- }
-
- static void
- fspike (GimpPixelRgn *src_rgn,
- GimpPixelRgn *dest_rgn,
- gint gray,
- gint x1,
- gint y1,
- gint x2,
- gint y2,
- gint xr,
- gint yr,
- gint tile_width,
- gint tile_height,
- gdouble inten,
- gdouble length,
- gdouble angle)
- {
- const gdouble efac = 2.0;
- gdouble xrt, yrt, dx, dy;
- gdouble rpos;
- gdouble in;
- gdouble theta;
- gdouble sfac;
- gint r, g, b;
- GimpTile *tile = NULL;
- gint row, col;
- gint i;
- gint bytes;
- gint ok;
- guchar pixel[MAX_CHANNELS];
- guchar color[MAX_CHANNELS];
-
- theta = angle;
- bytes = dest_rgn->bpp;
- row = -1;
- col = -1;
-
- /* draw the major spikes */
- for (i = 0; i < svals.spike_pts; i++)
- {
- gimp_pixel_rgn_get_pixel (dest_rgn, pixel, xr, yr);
-
- switch (svals.colortype)
- {
- case FOREGROUND:
- gimp_palette_get_foreground (&color[0], &color[1], &color[2]);
- break;
-
- case BACKGROUND:
- gimp_palette_get_background (&color[0], &color[1], &color[2]);
- break;
-
- default:
- color[0] = pixel[0];
- color[1] = pixel[1];
- color[2] = pixel[2];
- break;
- }
-
- if (svals.invers)
- {
- color[0] = 255 - color[0];
- color[1] = 255 - color[1];
- color[2] = 255 - color[2];
- }
- if (svals.random_hue > 0.0 || svals.random_saturation > 0.0)
- {
- r = 255 - color[0];
- g = 255 - color[1];
- b = 255 - color[2];
- gimp_rgb_to_hsv (&r, &g, &b);
- r+= (svals.random_hue * ((gdouble) rand() / (gdouble) RAND_MAX - 0.5))*255;
- if (r >= 255)
- r -= 255;
- else if (r < 0)
- r += 255;
- b+= (svals.random_saturation * (2.0 * (gdouble) rand() /
- (gdouble) RAND_MAX - 1.0))*255;
- if (b > 255) b = 255;
- gimp_hsv_to_rgb (&r, &g, &b);
- color[0] = 255 - r;
- color[1] = 255 - g;
- color[2] = 255 - b;
- }
-
- dx = 0.2 * cos (theta * G_PI / 180.0);
- dy = 0.2 * sin (theta * G_PI / 180.0);
- xrt = (gdouble) xr; /* (gdouble) is needed because some */
- yrt = (gdouble) yr; /* compilers optimize too much otherwise */
- rpos = 0.2;
-
- do
- {
- sfac = inten * exp (-pow (rpos / length, efac));
- ok = FALSE;
-
- in = 0.2 * sfac;
- if (in > 0.01)
- ok = TRUE;
-
- tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt, tile_width, tile_height, &row, &col, bytes, in, color);
- tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1.0, yrt, tile_width, tile_height, &row, &col, bytes, in, color);
- tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt + 1.0, yrt + 1.0, tile_width, tile_height, &row, &col, bytes, in, color);
- tile = rpnt (dest_rgn->drawable, tile, x1, y1, x2, y2, xrt, yrt + 1.0, tile_width, tile_height, &row, &col, bytes, in, color);
-
- xrt += dx;
- yrt += dy;
- rpos += 0.2;
- } while (ok);
-
- theta += 360.0 / svals.spike_pts;
- }
-
- if (tile)
- gimp_tile_unref (tile, TRUE);
- }
-
- static void
- sparkle_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- sint.run = TRUE;
-
- gtk_widget_destroy (GTK_WIDGET (data));
- }
-