/* 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. 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 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 * You can contact Seth at sjburges@gimp.org */ /* * Sparkle 1.27 - simulate pixel bloom and diffraction effects */ #include "config.h" #include #include #include #include #include #include #include "libgimp/stdplugins-intl.h" #define SCALE_WIDTH 175 #define ENTRY_WIDTH 7 #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; 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 (void); 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, gint threshold); static void fspike (GimpPixelRgn *src_rgn, GimpPixelRgn *dest_rgn, gint x1, gint y1, gint x2, gint y2, gint xr, gint yr, gint tile_width, gint tile_height, gdouble inten, gdouble length, gdouble angle, GRand *gr); 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, /* inverse */ FALSE, /* border */ NATURAL /* colortype */ }; 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, "inverse", "Inverse (TRUE/FALSE)" }, { GIMP_PDB_INT32, "border", "Add border (TRUE/FALSE)" }, { GIMP_PDB_INT32, "colortype", "Color of sparkles: { NATURAL (0), FOREGROUND (1), BACKGROUND (2) }" } }; gimp_install_procedure ("plug_in_sparkle", "Simulates pixel bloom and diffraction effects", "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_sparkle", "/Filters/Light Effects"); } static void run (const gchar *name, gint nparams, const GimpParam *param, gint *nreturn_vals, GimpParam **return_vals) { static GimpParam values[1]; GimpDrawable *drawable; GimpRunMode run_mode; GimpPDBStatusType status = GIMP_PDB_SUCCESS; gint threshold, x1, y1, x2, y2; run_mode = param[0].data.d_int32; INIT_I18N (); *nreturn_vals = 1; *return_vals = values; values[0].type = GIMP_PDB_STATUS; values[0].data.d_status = status; switch (run_mode) { case GIMP_RUN_INTERACTIVE: /* 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: /* 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.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.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: /* 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->drawable_id) || gimp_drawable_is_gray (drawable->drawable_id)) { gimp_progress_init (_("Sparkling...")); gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1)); if (svals.border) { gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2); num_sparkles = 2 * (x2 - x1 + y2 - y1); threshold = 255; } else { /* compute the luminosity which exceeds the luminosity threshold */ threshold = compute_lum_threshold (drawable, svals.lum_threshold); } 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 gboolean sparkle_dialog (void) { GtkWidget *dlg; GtkWidget *main_vbox; GtkWidget *vbox; GtkWidget *hbox; GtkWidget *table; GtkWidget *toggle; GtkWidget *r1, *r2, *r3; GtkObject *scale_data; gboolean run; gimp_ui_init ("sparkle", FALSE); dlg = gimp_dialog_new (_("Sparkle"), "sparkle", NULL, 0, gimp_standard_help_func, "plug-in-sparkle", GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL, GTK_STOCK_OK, GTK_RESPONSE_OK, NULL); main_vbox = gtk_vbox_new (FALSE, 12); gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12); gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), main_vbox, TRUE, TRUE, 0); gtk_widget_show (main_vbox); 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); 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); 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); 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); 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 means a Random Angle is chosen)"), NULL); g_signal_connect (scale_data, "value_changed", G_CALLBACK (gimp_double_adjustment_update), &svals.spike_angle); 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); scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 6, _("Op_acity:"), SCALE_WIDTH, ENTRY_WIDTH, svals.opacity, 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.opacity); 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 the Value 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); 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 the Value 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); hbox = gtk_hbox_new (FALSE, 12); gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0); gtk_widget_show (hbox); vbox = gtk_vbox_new (FALSE, 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); 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 an Inverse Effect be done?"), NULL); g_signal_connect (toggle, "toggled", G_CALLBACK (gimp_toggle_button_update), &svals.inverse); 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); /* 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); gtk_widget_show (dlg); run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK); gtk_widget_destroy (dlg); return run; } static gint compute_luminosity (const guchar *pixel, gboolean gray, gboolean has_alpha) { gint pixel0, pixel1, pixel2; if (svals.inverse) { pixel0 = 255 - pixel[0]; pixel1 = 255 - pixel[1]; pixel2 = 255 - pixel[2]; } else { pixel0 = pixel[0]; pixel1 = pixel[1]; pixel2 = pixel[2]; } if (gray) { if (has_alpha) return (pixel0 * pixel1) / 255; else return (pixel0); } else { gint min, max; min = MIN (pixel0, pixel1); min = MIN (min, pixel2); max = MAX (pixel0, pixel1); max = MAX (max, pixel2); if (has_alpha) return ((min + max) * pixel[3]) / 510; else return (min + max) / 2; } } static gint compute_lum_threshold (GimpDrawable *drawable, gdouble percentile) { GimpPixelRgn src_rgn; gpointer pr; gint values[256]; gint total, sum; gboolean gray; gboolean has_alpha; gint i; gint x1, y1, x2, y2; /* zero out the luminosity values array */ memset (values, 0, sizeof (gint) * 256); gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2); gray = gimp_drawable_is_gray (drawable->drawable_id); has_alpha = gimp_drawable_has_alpha (drawable->drawable_id); gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (x2 - x1), (y2 - y1), FALSE, FALSE); for (pr = gimp_pixel_rgns_register (1, &src_rgn); pr != NULL; pr = gimp_pixel_rgns_process (pr)) { const guchar *src, *s; gint sx, sy; src = src_rgn.data; for (sy = 0; sy < src_rgn.h; sy++) { s = src; for (sx = 0; sx < src_rgn.w; sx++) { values [compute_luminosity (s, gray, has_alpha)]++; s += src_rgn.bpp; } src += src_rgn.rowstride; } } total = (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; gdouble nfrac, length, inten, spike_angle; gint cur_progress, max_progress; gint x1, y1, x2, y2; gint lum, x, y, b; gboolean gray, has_alpha; gint alpha; gpointer pr; gint tile_width, tile_height; GRand *gr; gr = g_rand_new (); gimp_drawable_mask_bounds (drawable->drawable_id, &x1, &y1, &x2, &y2); gray = gimp_drawable_is_gray (drawable->drawable_id); has_alpha = gimp_drawable_has_alpha (drawable->drawable_id); alpha = (has_alpha) ? drawable->bpp - 1 : drawable->bpp; tile_width = gimp_tile_width(); tile_height = gimp_tile_height(); /* initialize the progress dialog */ cur_progress = 0; max_progress = num_sparkles; /* copy what is already there */ gimp_pixel_rgn_init (&src_rgn, drawable, x1, y1, (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)) { const guchar *src, *s; guchar *dest, *d; src = src_rgn.data; dest = dest_rgn.data; for (y = 0; y < src_rgn.h; y++) { s = src; d = dest; for (x = 0; x < src_rgn.w; x++) { if (has_alpha && s[alpha] == 0) { memset (dest, 0, alpha); } else { for (b = 0; b < alpha; b++) d[b] = s[b]; } if (has_alpha) d[alpha] = src[alpha]; s += src_rgn.bpp; d += dest_rgn.bpp; } src += src_rgn.rowstride; dest += dest_rgn.rowstride; } } /* 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)) { const guchar *src, *s; src = src_rgn.data; for (y = 0; y < src_rgn.h; y++) { s = src; for (x = 0; x < src_rgn.w; x++) { if (svals.border) { if (x + src_rgn.x == 0 || y + src_rgn.y == 0 || x + src_rgn.x == drawable->width - 1 || y + src_rgn.y == drawable->height - 1) { lum = 255; } else { lum = 0; } } else { lum = compute_luminosity (s, gray, has_alpha); } if (lum >= threshold) { nfrac = fabs ((gdouble) (lum + 1 - threshold) / (gdouble) (256 - threshold)); length = ((gdouble) svals.spike_len * (gdouble) pow (nfrac, 0.8)); inten = svals.flare_inten * nfrac; /* fspike im x,y intens rlength angle */ if (svals.spike_pts > 0) { gdouble random_1 = g_rand_double(gr); /* major spikes */ if (svals.spike_angle == -1) spike_angle = g_rand_double_range (gr, 0, 360.0); else spike_angle = svals.spike_angle; if (random_1 <= svals.density) { fspike (&src_rgn, &dest_rgn, x1, y1, x2, y2, x + src_rgn.x, y + src_rgn.y, tile_width, tile_height, inten, length, spike_angle, gr); /* minor spikes */ fspike (&src_rgn, &dest_rgn, x1, y1, x2, y2, x + src_rgn.x, y + src_rgn.y, tile_width, tile_height, inten * 0.7, length * 0.7, ((gdouble)spike_angle+180.0/svals.spike_pts), gr); } } cur_progress ++; if ((cur_progress % 5) == 0) gimp_progress_update ((double) cur_progress / (double) max_progress); } s += src_rgn.bpp; } src += src_rgn.rowstride; } } gimp_progress_update (1.0); /* update the blurred region */ gimp_drawable_flush (drawable); gimp_drawable_merge_shadow (drawable->drawable_id, TRUE); gimp_drawable_update (drawable->drawable_id, x1, y1, (x2 - x1), (y2 - y1)); g_rand_free (gr); } static inline GimpTile * rpnt (GimpDrawable *drawable, GimpTile *tile, gint x1, gint y1, gint x2, gint y2, gdouble xr, gdouble yr, gint tile_width, gint tile_height, gint *row, gint *col, gint bytes, gdouble inten, guchar color[MAX_CHANNELS]) { 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.inverse) new = 255 - pixel[b]; else new = pixel[b]; if (svals.preserve_luminosity) { 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.inverse) pixel[b] = 255 - new; else pixel[b] = new; } } return tile; } static void fspike (GimpPixelRgn *src_rgn, GimpPixelRgn *dest_rgn, gint x1, gint y1, gint x2, gint y2, gint xr, gint yr, gint tile_width, gint tile_height, gdouble inten, gdouble length, gdouble angle, GRand *gr) { 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; GimpRGB gimp_color; guchar pixel[MAX_CHANNELS]; guchar color[MAX_CHANNELS]; theta = angle; bytes = dest_rgn->bpp; row = -1; col = -1; switch (svals.colortype) { case NATURAL: break; case FOREGROUND: gimp_context_get_foreground (&gimp_color); gimp_rgb_get_uchar (&gimp_color, &pixel[0], &pixel[1], &pixel[2]); break; case BACKGROUND: gimp_context_get_background (&gimp_color); gimp_rgb_get_uchar (&gimp_color, &pixel[0], &pixel[1], &pixel[2]); break; } /* draw the major spikes */ for (i = 0; i < svals.spike_pts; i++) { if (svals.colortype == NATURAL) gimp_pixel_rgn_get_pixel (src_rgn, pixel, xr, yr); color[0] = pixel[0]; color[1] = pixel[1]; color[2] = pixel[2]; 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, -0.5, 0.5)) * 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; 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); }