/* GIMP - The GNU Image Manipulation Program * Copyright (C) 1995 Spencer Kimball and Peter Mattis * * 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/>. */ /* Cartoon filter for GIMP for BIPS * -Spencer Kimball * * This filter propagates dark values in an image based on * each pixel's relative darkness to a neighboring average */ #include "config.h" #include <string.h> #include <libgimp/gimp.h> #include <libgimp/gimpui.h> #include "libgimp/stdplugins-intl.h" /* Some useful macros */ #define PLUG_IN_PROC "plug-in-cartoon" #define PLUG_IN_BINARY "cartoon" #define PLUG_IN_ROLE "gimp-cartoon" #define TILE_CACHE_SIZE 48 typedef struct { gdouble mask_radius; gdouble threshold; gdouble pct_black; } CartoonVals; /* * Function prototypes. */ static void query (void); static void run (const gchar *name, gint nparams, const GimpParam *param, gint *nreturn_vals, GimpParam **return_vals); static void cartoon (GimpDrawable *drawable, GimpPreview *preview); static gboolean cartoon_dialog (GimpDrawable *drawable); static gdouble compute_ramp (guchar *dest1, guchar *dest2, gint length, gdouble pct_black); /* * Gaussian blur helper functions */ static void find_constants (gdouble n_p[], gdouble n_m[], gdouble d_p[], gdouble d_m[], gdouble bd_p[], gdouble bd_m[], gdouble std_dev); static void transfer_pixels (gdouble *src1, gdouble *src2, guchar *dest, gint jump, gint bytes, gint width); /***** Local vars *****/ const GimpPlugInInfo PLUG_IN_INFO = { NULL, /* init */ NULL, /* quit */ query, /* query */ run, /* run */ }; static CartoonVals cvals = { 7.0, /* mask_radius */ 1.0, /* threshold */ 0.2 /* pct_black */ }; /***** Functions *****/ 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, "mask-radius", "Cartoon mask radius (radius of pixel neighborhood)" }, { GIMP_PDB_FLOAT, "pct-black", "Percentage of darkened pixels to set to black (0.0 - 1.0)" } }; gchar *help_string = "Propagates dark values in an image based on " "each pixel's relative darkness to a neighboring average. The idea behind " "this filter is to give the look of a black felt pen drawing subsequently " "shaded with color. This is achieved by darkening areas of the image which " "are measured to be darker than a neighborhood average. In this way, " "sufficiently large shifts in intensity are darkened to black. The rate " "at which they are darkened to black is determined by the second pct_black " "parameter. The mask_radius parameter controls the size of the pixel " "neighborhood over which the average intensity is computed and then " "compared to each pixel in the neighborhood to decide whether or not to " "darken it to black. Large values for mask_radius result in very thick " "black areas bordering the shaded regions of color and much less detail " "for black areas everywhere including inside regions of color. Small " "values result in more subtle pen strokes and detail everywhere. Small " "values for the pct_black make the blend from the color regions to the " "black border lines smoother and the lines themselves thinner and less " "noticeable; larger values achieve the opposite effect."; gimp_install_procedure (PLUG_IN_PROC, N_("Simulate a cartoon by enhancing edges"), help_string, "Spencer Kimball", "Bit Specialists, Inc.", "2001", N_("Ca_rtoon (legacy)..."), "RGB*, GRAY*", GIMP_PLUGIN, G_N_ELEMENTS (args), 0, args, NULL); gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Artistic"); } static void run (const gchar *name, gint nparams, const GimpParam *param, gint *nreturn_vals, GimpParam **return_vals) { static GimpParam values[2]; GimpRunMode run_mode; GimpDrawable *drawable; GimpPDBStatusType status = GIMP_PDB_SUCCESS; run_mode = param[0].data.d_int32; /* Get the specified drawable */ drawable = gimp_drawable_get (param[2].data.d_drawable); /* set the tile cache size */ gimp_tile_cache_ntiles (TILE_CACHE_SIZE); *nreturn_vals = 1; *return_vals = values; values[0].type = GIMP_PDB_STATUS; values[0].data.d_status = status; INIT_I18N(); switch (run_mode) { case GIMP_RUN_INTERACTIVE: /* Possibly retrieve data */ gimp_get_data (PLUG_IN_PROC, &cvals); /* First acquire information with a dialog */ if (! cartoon_dialog (drawable)) return; break; case GIMP_RUN_NONINTERACTIVE: cvals.mask_radius = param[3].data.d_float; cvals.pct_black = param[4].data.d_float; break; case GIMP_RUN_WITH_LAST_VALS: /* Possibly retrieve data */ gimp_get_data (PLUG_IN_PROC, &cvals); break; default: break; } if (status == GIMP_PDB_SUCCESS) { /* Make sure that the drawable is RGB or GRAY color */ if (gimp_drawable_is_rgb (drawable->drawable_id) || gimp_drawable_is_gray (drawable->drawable_id)) { gimp_progress_init ("Cartoon"); cartoon (drawable, NULL); if (run_mode != GIMP_RUN_NONINTERACTIVE) gimp_displays_flush (); /* Store data */ if (run_mode == GIMP_RUN_INTERACTIVE) gimp_set_data (PLUG_IN_PROC, &cvals, sizeof (CartoonVals)); } else { status = GIMP_PDB_EXECUTION_ERROR; *nreturn_vals = 2; values[1].type = GIMP_PDB_STRING; values[1].data.d_string = _("Cannot operate on indexed color images."); } } values[0].data.d_status = status; gimp_drawable_detach (drawable); } /* * Cartoon algorithm * ----------------- * Mask radius = radius of pixel neighborhood for intensity comparison * Threshold = relative intensity difference which will result in darkening * Ramp = amount of relative intensity difference before total black * Blur radius = mask radius / 3.0 * * Algorithm: * For each pixel, calculate pixel intensity value to be: avg (blur radius) * relative diff = pixel intensity / avg (mask radius) * If relative diff < Threshold * intensity mult = (Ramp - MIN (Ramp, (Threshold - relative diff))) / Ramp * pixel intensity *= intensity mult */ static void cartoon (GimpDrawable *drawable, GimpPreview *preview) { GimpPixelRgn src_rgn, dest_rgn; GimpPixelRgn *pr; gint x, y, width, height; gint bytes; gboolean has_alpha; guchar *dest1; guchar *dest2; guchar *src; guchar *src1, *sp_p1, *sp_m1; guchar *src2, *sp_p2, *sp_m2; gdouble n_p1[5], n_m1[5]; gdouble n_p2[5], n_m2[5]; gdouble d_p1[5], d_m1[5]; gdouble d_p2[5], d_m2[5]; gdouble bd_p1[5], bd_m1[5]; gdouble bd_p2[5], bd_m2[5]; gdouble *val_p1, *val_m1, *vp1, *vm1; gdouble *val_p2, *val_m2, *vp2, *vm2; gint i, j; gint row, col, b; gint terms; gint progress, max_progress; gint initial_p1[4]; gint initial_p2[4]; gint initial_m1[4]; gint initial_m2[4]; gdouble radius; gdouble std_dev1; gdouble std_dev2; gdouble ramp; guchar *preview_buffer = NULL; if (preview) { gimp_preview_get_position (preview, &x, &y); gimp_preview_get_size (preview, &width, &height); } else if (! gimp_drawable_mask_intersect (drawable->drawable_id, &x, &y, &width, &height)) { return; } bytes = drawable->bpp; has_alpha = gimp_drawable_has_alpha (drawable->drawable_id); val_p1 = g_new (gdouble, MAX (width, height) * bytes); val_p2 = g_new (gdouble, MAX (width, height) * bytes); val_m1 = g_new (gdouble, MAX (width, height) * bytes); val_m2 = g_new (gdouble, MAX (width, height) * bytes); src = g_new (guchar, MAX (width, height) * bytes); dest1 = g_new0 (guchar, width * height); dest2 = g_new0 (guchar, width * height); gimp_pixel_rgn_init (&src_rgn, drawable, 0, 0, drawable->width, drawable->height, FALSE, FALSE); progress = 0; max_progress = width * height * 2; /* Calculate the standard deviations */ radius = 1.0; /* blur radius */ radius = fabs (radius) + 1.0; std_dev1 = sqrt (-(radius * radius) / (2 * log (1.0 / 255.0))); radius = cvals.mask_radius; radius = fabs (radius) + 1.0; std_dev2 = sqrt (-(radius * radius) / (2 * log (1.0 / 255.0))); /* derive the constants for calculating the gaussian from the std dev */ find_constants (n_p1, n_m1, d_p1, d_m1, bd_p1, bd_m1, std_dev1); find_constants (n_p2, n_m2, d_p2, d_m2, bd_p2, bd_m2, std_dev2); /* First the vertical pass */ for (col = 0; col < width; col++) { memset (val_p1, 0, height * bytes * sizeof (gdouble)); memset (val_p2, 0, height * bytes * sizeof (gdouble)); memset (val_m1, 0, height * bytes * sizeof (gdouble)); memset (val_m2, 0, height * bytes * sizeof (gdouble)); gimp_pixel_rgn_get_col (&src_rgn, src, col + x, y, height); src1 = src; sp_p1 = src1; sp_m1 = src1 + (height - 1) * bytes; vp1 = val_p1; vp2 = val_p2; vm1 = val_m1 + (height - 1) * bytes; vm2 = val_m2 + (height - 1) * bytes; /* Set up the first vals */ for (i = 0; i < bytes; i++) { initial_p1[i] = sp_p1[i]; initial_m1[i] = sp_m1[i]; } for (row = 0; row < height; row++) { gdouble *vpptr1, *vmptr1; gdouble *vpptr2, *vmptr2; terms = (row < 4) ? row : 4; for (b = 0; b < bytes; b++) { vpptr1 = vp1 + b; vmptr1 = vm1 + b; vpptr2 = vp2 + b; vmptr2 = vm2 + b; for (i = 0; i <= terms; i++) { *vpptr1 += n_p1[i] * sp_p1[(-i * bytes) + b] - d_p1[i] * vp1[(-i * bytes) + b]; *vmptr1 += n_m1[i] * sp_m1[(i * bytes) + b] - d_m1[i] * vm1[(i * bytes) + b]; *vpptr2 += n_p2[i] * sp_p1[(-i * bytes) + b] - d_p2[i] * vp2[(-i * bytes) + b]; *vmptr2 += n_m2[i] * sp_m1[(i * bytes) + b] - d_m2[i] * vm2[(i * bytes) + b]; } for (j = i; j <= 4; j++) { *vpptr1 += (n_p1[j] - bd_p1[j]) * initial_p1[b]; *vmptr1 += (n_m1[j] - bd_m1[j]) * initial_m1[b]; *vpptr2 += (n_p2[j] - bd_p2[j]) * initial_p1[b]; *vmptr2 += (n_m2[j] - bd_m2[j]) * initial_m1[b]; } } sp_p1 += bytes; sp_m1 -= bytes; vp1 += bytes; vp2 += bytes; vm1 -= bytes; vm2 -= bytes; } transfer_pixels (val_p1, val_m1, dest1 + col, width, bytes, height); transfer_pixels (val_p2, val_m2, dest2 + col, width, bytes, height); if (!preview) { progress += height; if ((col % 5) == 0) gimp_progress_update ((gdouble) progress / (gdouble) max_progress); } } for (row = 0; row < height; row++) { memset (val_p1, 0, width * sizeof (gdouble)); memset (val_p2, 0, width * sizeof (gdouble)); memset (val_m1, 0, width * sizeof (gdouble)); memset (val_m2, 0, width * sizeof (gdouble)); src1 = dest1 + row * width; src2 = dest2 + row * width; sp_p1 = src1; sp_p2 = src2; sp_m1 = src1 + width - 1; sp_m2 = src2 + width - 1; vp1 = val_p1; vp2 = val_p2; vm1 = val_m1 + width - 1; vm2 = val_m2 + width - 1; /* Set up the first vals */ initial_p1[0] = sp_p1[0]; initial_p2[0] = sp_p2[0]; initial_m1[0] = sp_m1[0]; initial_m2[0] = sp_m2[0]; for (col = 0; col < width; col++) { gdouble *vpptr1, *vmptr1; gdouble *vpptr2, *vmptr2; terms = (col < 4) ? col : 4; vpptr1 = vp1; vmptr1 = vm1; vpptr2 = vp2; vmptr2 = vm2; for (i = 0; i <= terms; i++) { *vpptr1 += n_p1[i] * sp_p1[-i] - d_p1[i] * vp1[-i]; *vmptr1 += n_m1[i] * sp_m1[i] - d_m1[i] * vm1[i]; *vpptr2 += n_p2[i] * sp_p2[-i] - d_p2[i] * vp2[-i]; *vmptr2 += n_m2[i] * sp_m2[i] - d_m2[i] * vm2[i]; } for (j = i; j <= 4; j++) { *vpptr1 += (n_p1[j] - bd_p1[j]) * initial_p1[0]; *vmptr1 += (n_m1[j] - bd_m1[j]) * initial_m1[0]; *vpptr2 += (n_p2[j] - bd_p2[j]) * initial_p2[0]; *vmptr2 += (n_m2[j] - bd_m2[j]) * initial_m2[0]; } sp_p1 ++; sp_p2 ++; sp_m1 --; sp_m2 --; vp1 ++; vp2 ++; vm1 --; vm2 --; } transfer_pixels (val_p1, val_m1, dest1 + row * width, 1, 1, width); transfer_pixels (val_p2, val_m2, dest2 + row * width, 1, 1, width); if (!preview) { progress += width; if ((row % 5) == 0) gimp_progress_update ((gdouble) progress / (gdouble) max_progress); } } /* Compute the ramp value which sets 'pct_black' % of the darkened pixels black */ ramp = compute_ramp (dest1, dest2, width * height, cvals.pct_black); /* Initialize the pixel regions. */ gimp_pixel_rgn_init (&src_rgn, drawable, x, y, width, height, FALSE, FALSE); if (preview) { pr = gimp_pixel_rgns_register (1, &src_rgn); preview_buffer = g_new (guchar, width * height * bytes); } else { gimp_pixel_rgn_init (&dest_rgn, drawable, x, y, width, height, TRUE, TRUE); pr = gimp_pixel_rgns_register (2, &src_rgn, &dest_rgn); } while (pr) { guchar *src_ptr = src_rgn.data; guchar *dest_ptr; guchar *blur_ptr = dest1 + (src_rgn.y - y) * width + (src_rgn.x - x); guchar *avg_ptr = dest2 + (src_rgn.y - y) * width + (src_rgn.x - x); gdouble diff; gdouble mult = 0.0; gdouble lightness; if (preview) dest_ptr = preview_buffer + ((src_rgn.y - y) * width + (src_rgn.x - x)) * bytes; else dest_ptr = dest_rgn.data; for (row = 0; row < src_rgn.h; row++) { for (col = 0; col < src_rgn.w; col++) { if (avg_ptr[col] != 0) { diff = (gdouble) blur_ptr[col] / (gdouble) avg_ptr[col]; if (diff < cvals.threshold) { if (ramp == 0.0) mult = 0.0; else mult = (ramp - MIN (ramp, (cvals.threshold - diff))) / ramp; } else mult = 1.0; } lightness = CLAMP (blur_ptr[col] * mult, 0, 255); if (bytes < 3) { dest_ptr[col * bytes] = (guchar) lightness; if (has_alpha) dest_ptr[col * bytes + 1] = src_ptr[col * src_rgn.bpp + 1]; } else { /* Convert to HLS, set lightness and convert back */ gint r, g, b; r = src_ptr[col * src_rgn.bpp + 0]; g = src_ptr[col * src_rgn.bpp + 1]; b = src_ptr[col * src_rgn.bpp + 2]; gimp_rgb_to_hsl_int (&r, &g, &b); b = lightness; gimp_hsl_to_rgb_int (&r, &g, &b); dest_ptr[col * bytes + 0] = r; dest_ptr[col * bytes + 1] = g; dest_ptr[col * bytes + 2] = b; if (has_alpha) dest_ptr[col * bytes + 3] = src_ptr[col * src_rgn.bpp + 3]; } } src_ptr += src_rgn.rowstride; if (preview) dest_ptr += width * bytes; else dest_ptr += dest_rgn.rowstride; blur_ptr += width; avg_ptr += width; } if (!preview) { progress += src_rgn.w * src_rgn.h; gimp_progress_update ((gdouble) progress / (gdouble) max_progress); } pr = gimp_pixel_rgns_process (pr); } if (preview) { gimp_preview_draw_buffer (preview, preview_buffer, width * bytes); g_free (preview_buffer); } else { gimp_progress_update (1.0); /* merge the shadow, update the drawable */ gimp_drawable_flush (drawable); gimp_drawable_merge_shadow (drawable->drawable_id, TRUE); gimp_drawable_update (drawable->drawable_id, x, y, width, height); } /* free up buffers */ g_free (val_p1); g_free (val_p2); g_free (val_m1); g_free (val_m2); g_free (src); g_free (dest1); g_free (dest2); } static gdouble compute_ramp (guchar *dest1, guchar *dest2, gint length, gdouble pct_black) { gint hist[100]; gdouble diff; gint count; gint i; gint sum; memset (hist, 0, sizeof (int) * 100); count = 0; for (i = 0; i < length; i++) { if (*dest2 != 0) { diff = (gdouble) *dest1 / (gdouble) *dest2; if (diff < 1.0) { hist[(int) (diff * 100)] += 1; count += 1; } } dest1++; dest2++; } if (pct_black == 0.0 || count == 0) return 1.0; sum = 0; for (i = 0; i < 100; i++) { sum += hist[i]; if (((gdouble) sum / (gdouble) count) > pct_black) return (1.0 - (gdouble) i / 100.0); } return 0.0; } /* * Gaussian blur helper functions */ static void transfer_pixels (gdouble *src1, gdouble *src2, guchar *dest, gint jump, gint bytes, gint width) { gint i, b; gdouble sum[4]; for(i = 0; i < width; i++) { for (b = 0; b < bytes; b++) { sum[b] = src1[b] + src2[b]; if (sum[b] > 255) sum[b] = 255; else if(sum[b] < 0) sum[b] = 0; } /* Convert to lightness if RGB */ if (bytes > 2) *dest = (guchar) gimp_rgb_to_l_int (sum[0], sum[1], sum[2]); else *dest = (guchar) sum[0]; src1 += bytes; src2 += bytes; dest += jump; } } static void find_constants (gdouble n_p[], gdouble n_m[], gdouble d_p[], gdouble d_m[], gdouble bd_p[], gdouble bd_m[], gdouble std_dev) { gint i; gdouble constants [8]; gdouble div; /* The constants used in the implementation of a casual sequence * using a 4th order approximation of the gaussian operator */ div = sqrt (2 * G_PI) * std_dev; constants [0] = -1.783 / std_dev; constants [1] = -1.723 / std_dev; constants [2] = 0.6318 / std_dev; constants [3] = 1.997 / std_dev; constants [4] = 1.6803 / div; constants [5] = 3.735 / div; constants [6] = -0.6803 / div; constants [7] = -0.2598 / div; n_p [0] = constants[4] + constants[6]; n_p [1] = exp (constants[1]) * (constants[7] * sin (constants[3]) - (constants[6] + 2 * constants[4]) * cos (constants[3])) + exp (constants[0]) * (constants[5] * sin (constants[2]) - (2 * constants[6] + constants[4]) * cos (constants[2])); n_p [2] = 2 * exp (constants[0] + constants[1]) * ((constants[4] + constants[6]) * cos (constants[3]) * cos (constants[2]) - constants[5] * cos (constants[3]) * sin (constants[2]) - constants[7] * cos (constants[2]) * sin (constants[3])) + constants[6] * exp (2 * constants[0]) + constants[4] * exp (2 * constants[1]); n_p [3] = exp (constants[1] + 2 * constants[0]) * (constants[7] * sin (constants[3]) - constants[6] * cos (constants[3])) + exp (constants[0] + 2 * constants[1]) * (constants[5] * sin (constants[2]) - constants[4] * cos (constants[2])); n_p [4] = 0.0; d_p [0] = 0.0; d_p [1] = -2 * exp (constants[1]) * cos (constants[3]) - 2 * exp (constants[0]) * cos (constants[2]); d_p [2] = 4 * cos (constants[3]) * cos (constants[2]) * exp (constants[0] + constants[1]) + exp (2 * constants[1]) + exp (2 * constants[0]); d_p [3] = -2 * cos (constants[2]) * exp (constants[0] + 2 * constants[1]) - 2 * cos (constants[3]) * exp (constants[1] + 2 * constants[0]); d_p [4] = exp (2 * constants[0] + 2 * constants[1]); #ifndef ORIGINAL_READABLE_CODE memcpy(d_m, d_p, 5 * sizeof(gdouble)); #else for (i = 0; i <= 4; i++) d_m [i] = d_p [i]; #endif n_m[0] = 0.0; for (i = 1; i <= 4; i++) n_m [i] = n_p[i] - d_p[i] * n_p[0]; { gdouble sum_n_p, sum_n_m, sum_d; gdouble a, b; sum_n_p = 0.0; sum_n_m = 0.0; sum_d = 0.0; for (i = 0; i <= 4; i++) { sum_n_p += n_p[i]; sum_n_m += n_m[i]; sum_d += d_p[i]; } #ifndef ORIGINAL_READABLE_CODE sum_d++; a = sum_n_p / sum_d; b = sum_n_m / sum_d; #else a = sum_n_p / (1 + sum_d); b = sum_n_m / (1 + sum_d); #endif for (i = 0; i <= 4; i++) { bd_p[i] = d_p[i] * a; bd_m[i] = d_m[i] * b; } } } /*******************************************************/ /* Dialog */ /*******************************************************/ static gboolean cartoon_dialog (GimpDrawable *drawable) { GtkWidget *dialog; GtkWidget *main_vbox; GtkWidget *preview; GtkWidget *table; GtkObject *scale_data; gboolean run; gimp_ui_init (PLUG_IN_BINARY, FALSE); dialog = gimp_dialog_new (_("Cartoon"), 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->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 (cartoon), drawable); table = gtk_table_new (3, 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); /* Label, scale, entry for cvals.amount */ scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 0, _("_Mask radius:"), 100, 5, cvals.mask_radius, 1.0, 50.0, 1, 5.0, 2, TRUE, 0, 0, NULL, NULL); g_signal_connect (scale_data, "value-changed", G_CALLBACK (gimp_double_adjustment_update), &cvals.mask_radius); g_signal_connect_swapped (scale_data, "value-changed", G_CALLBACK (gimp_preview_invalidate), preview); /* Label, scale, entry for cvals.amount */ scale_data = gimp_scale_entry_new (GTK_TABLE (table), 0, 1, _("_Percent black:"), 50, 5, cvals.pct_black, 0.0, 1.0, 0.01, 0.1, 3, TRUE, 0, 0, NULL, NULL); g_signal_connect (scale_data, "value-changed", G_CALLBACK (gimp_double_adjustment_update), &cvals.pct_black); g_signal_connect_swapped (scale_data, "value-changed", 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; }