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- /*
- * "$Id: sharpen.c,v 1.23 2000/08/22 01:26:56 neo Exp $"
- *
- * Sharpen filters for The GIMP -- an image manipulation program
- *
- * Copyright 1997-1998 Michael Sweet (mike@easysw.com)
- *
- * 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.
- *
- * Contents:
- *
- * main() - Main entry - just call gimp_main()...
- * query() - Respond to a plug-in query...
- * run() - Run the filter...
- * sharpen() - Sharpen an image using a median filter.
- * sharpen_dialog() - Popup a dialog window for the filter box size...
- * preview_init() - Initialize the preview window...
- * preview_scroll_callback() - Update the preview when a scrollbar is moved.
- * preview_update() - Update the preview window.
- * preview_exit() - Free all memory used by the preview window...
- * dialog_iscale_update() - Update the value field using the scale.
- * dialog_ok_callback() - Start the filter...
- * gray_filter() - Sharpen grayscale pixels.
- * graya_filter() - Sharpen grayscale+alpha pixels.
- * rgb_filter() - Sharpen RGB pixels.
- * rgba_filter() - Sharpen RGBA pixels.
- *
- * Revision History:
- *
- * See ChangeLog
- */
-
- #include "config.h"
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <signal.h>
-
- #include <gtk/gtk.h>
-
- #include <libgimp/gimp.h>
- #include <libgimp/gimpui.h>
-
- #include "libgimp/stdplugins-intl.h"
-
-
- /*
- * Constants...
- */
-
- #define PLUG_IN_NAME "plug_in_sharpen"
- #define PLUG_IN_VERSION "1.4.2 - 3 June 1998"
- #define PREVIEW_SIZE 128
- #define SCALE_WIDTH 100
-
- /*
- * Local functions...
- */
-
- static void query (void);
- static void run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **returm_vals);
-
- static void compute_luts (void);
- static void sharpen (void);
-
- static gint sharpen_dialog (void);
-
- static void dialog_iscale_update (GtkAdjustment *, gint *);
- static void dialog_ok_callback (GtkWidget *, gpointer);
-
- static void preview_init (void);
- static void preview_exit (void);
- static void preview_update (void);
- static void preview_scroll_callback (void);
-
- typedef gint32 intneg;
- typedef gint32 intpos;
-
- static void gray_filter (int width, guchar *src, guchar *dst, intneg *neg0,
- intneg *neg1, intneg *neg2);
- static void graya_filter (int width, guchar *src, guchar *dst, intneg *neg0,
- intneg *neg1, intneg *neg2);
- static void rgb_filter (int width, guchar *src, guchar *dst, intneg *neg0,
- intneg *neg1, intneg *neg2);
- static void rgba_filter (int width, guchar *src, guchar *dst, intneg *neg0,
- intneg *neg1, intneg *neg2);
-
-
- /*
- * Globals...
- */
-
- GimpPlugInInfo PLUG_IN_INFO =
- {
- NULL, /* init_proc */
- NULL, /* quit_proc */
- query, /* query_proc */
- run /* run_proc */
- };
-
- static GtkWidget *preview; /* Preview widget */
- static gint preview_width; /* Width of preview widget */
- static gint preview_height; /* Height of preview widget */
- static gint preview_x1; /* Upper-left X of preview */
- static gint preview_y1; /* Upper-left Y of preview */
- static gint preview_x2; /* Lower-right X of preview */
- static gint preview_y2; /* Lower-right Y of preview */
- static guchar *preview_src; /* Source pixel image */
- static intneg *preview_neg; /* Negative coefficient pixels */
- static guchar *preview_dst; /* Destination pixel image */
- static guchar *preview_image; /* Preview RGB image */
- static GtkObject *hscroll_data; /* Horizontal scrollbar data */
- static GtkObject *vscroll_data; /* Vertical scrollbar data */
-
- static GimpDrawable *drawable = NULL; /* Current image */
- static gint sel_x1; /* Selection bounds */
- static gint sel_y1;
- static gint sel_x2;
- static gint sel_y2;
- static gint sel_width; /* Selection width */
- static gint sel_height; /* Selection height */
- static gint img_bpp; /* Bytes-per-pixel in image */
- static gint sharpen_percent = 10; /* Percent of sharpening */
- static gint run_filter = FALSE; /* True if we should run the filter */
-
- static intneg neg_lut[256]; /* Negative coefficient LUT */
- static intpos pos_lut[256]; /* Positive coefficient LUT */
-
-
- MAIN ()
-
- static void
- query (void)
- {
- static GimpParamDef args[] =
- {
- { GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
- { GIMP_PDB_IMAGE, "image", "Input image" },
- { GIMP_PDB_DRAWABLE, "drawable", "Input drawable" },
- { GIMP_PDB_INT32, "percent", "Percent sharpening (default = 10)" }
- };
- static gint nargs = sizeof (args) / sizeof (args[0]);
-
- gimp_install_procedure (PLUG_IN_NAME,
- "Sharpen filter, typically used to 'sharpen' a photographic image.",
- "This plug-in selectively performs a convolution filter on an image.",
- "Michael Sweet <mike@easysw.com>",
- "Copyright 1997-1998 by Michael Sweet",
- PLUG_IN_VERSION,
- N_("<Image>/Filters/Enhance/Sharpen..."),
- "RGB*, GRAY*",
- GIMP_PLUGIN,
- nargs, 0,
- args, NULL);
- }
-
- static void
- run (gchar *name,
- gint nparams,
- GimpParam *param,
- gint *nreturn_vals,
- GimpParam **return_vals)
- {
- GimpRunModeType run_mode; /* Current run mode */
- GimpPDBStatusType status; /* Return status */
- GimpParam *values; /* Return values */
-
- /*
- * Initialize parameter data...
- */
-
- status = GIMP_PDB_SUCCESS;
- run_mode = param[0].data.d_int32;
-
- values = g_new (GimpParam, 1);
-
- values[0].type = GIMP_PDB_STATUS;
- values[0].data.d_status = status;
-
- *nreturn_vals = 1;
- *return_vals = values;
-
- /*
- * Get drawable information...
- */
-
- drawable = gimp_drawable_get (param[2].data.d_drawable);
-
- gimp_drawable_mask_bounds (drawable->id, &sel_x1, &sel_y1, &sel_x2, &sel_y2);
-
- sel_width = sel_x2 - sel_x1;
- sel_height = sel_y2 - sel_y1;
- img_bpp = gimp_drawable_bpp (drawable->id);
-
- /*
- * See how we will run
- */
-
- switch (run_mode)
- {
- case GIMP_RUN_INTERACTIVE:
- INIT_I18N_UI();
- /*
- * Possibly retrieve data...
- */
- gimp_get_data (PLUG_IN_NAME, &sharpen_percent);
-
- /*
- * Get information from the dialog...
- */
- if (!sharpen_dialog ())
- return;
- break;
-
- case GIMP_RUN_NONINTERACTIVE:
- INIT_I18N();
- /*
- * Make sure all the arguments are present...
- */
- if (nparams != 4)
- status = GIMP_PDB_CALLING_ERROR;
- else
- sharpen_percent = param[3].data.d_int32;
- break;
-
- case GIMP_RUN_WITH_LAST_VALS:
- INIT_I18N();
- /*
- * Possibly retrieve data...
- */
- gimp_get_data (PLUG_IN_NAME, &sharpen_percent);
- break;
-
- default:
- status = GIMP_PDB_CALLING_ERROR;
- break;;
- };
-
- /*
- * Sharpen the image...
- */
-
- if (status == GIMP_PDB_SUCCESS)
- {
- if ((gimp_drawable_is_rgb (drawable->id) ||
- gimp_drawable_is_gray (drawable->id)))
- {
- /*
- * Set the tile cache size...
- */
- gimp_tile_cache_ntiles (2 * (drawable->width + gimp_tile_width() - 1) /
- gimp_tile_width() + 1);
-
- /*
- * Run!
- */
- sharpen ();
-
- /*
- * If run mode is interactive, flush displays...
- */
- if (run_mode != GIMP_RUN_NONINTERACTIVE)
- gimp_displays_flush ();
-
- /*
- * Store data...
- */
- if (run_mode == GIMP_RUN_INTERACTIVE)
- gimp_set_data (PLUG_IN_NAME,
- &sharpen_percent, sizeof (sharpen_percent));
- }
- else
- status = GIMP_PDB_EXECUTION_ERROR;
- };
-
- /*
- * Reset the current run status...
- */
- values[0].data.d_status = status;
-
- /*
- * Detach from the drawable...
- */
- gimp_drawable_detach (drawable);
- }
-
-
- static void
- compute_luts (void)
- {
- gint i; /* Looping var */
- gint fact; /* 1 - sharpness */
-
- fact = 100 - sharpen_percent;
- if (fact < 1)
- fact = 1;
-
- for (i = 0; i < 256; i ++)
- {
- pos_lut[i] = 800 * i / fact;
- neg_lut[i] = (4 + pos_lut[i] - (i << 3)) >> 3;
- };
- }
-
- /*
- * 'sharpen()' - Sharpen an image using a convolution filter.
- */
-
- static void
- sharpen (void)
- {
- GimpPixelRgn src_rgn, /* Source image region */
- dst_rgn; /* Destination image region */
- guchar *src_rows[4], /* Source pixel rows */
- *src_ptr, /* Current source pixel */
- *dst_row; /* Destination pixel row */
- intneg *neg_rows[4], /* Negative coefficient rows */
- *neg_ptr; /* Current negative coefficient */
- gint i, /* Looping vars */
- y, /* Current location in image */
- row, /* Current row in src_rows */
- count, /* Current number of filled src_rows */
- width; /* Byte width of the image */
- void (*filter)(int, guchar *, guchar *, intneg *, intneg *, intneg *);
-
- filter = NULL;
-
- /*
- * Let the user know what we're doing...
- */
- gimp_progress_init( _("Sharpening..."));
-
- /*
- * Setup for filter...
- */
-
- gimp_pixel_rgn_init (&src_rgn, drawable,
- sel_x1, sel_y1, sel_width, sel_height, FALSE, FALSE);
- gimp_pixel_rgn_init (&dst_rgn, drawable,
- sel_x1, sel_y1, sel_width, sel_height, TRUE, TRUE);
-
- compute_luts ();
-
- width = sel_width * img_bpp;
-
- for (row = 0; row < 4; row ++)
- {
- src_rows[row] = g_new (guchar, width);
- neg_rows[row] = g_new (intneg, width);
- };
-
- dst_row = g_new (guchar, width);
-
- /*
- * Pre-load the first row for the filter...
- */
-
- gimp_pixel_rgn_get_row (&src_rgn, src_rows[0], sel_x1, sel_y1, sel_width);
- for (i = width, src_ptr = src_rows[0], neg_ptr = neg_rows[0];
- i > 0;
- i --, src_ptr ++, neg_ptr ++)
- *neg_ptr = neg_lut[*src_ptr];
-
- row = 1;
- count = 1;
-
- /*
- * Select the filter...
- */
-
- switch (img_bpp)
- {
- case 1 :
- filter = gray_filter;
- break;
- case 2 :
- filter = graya_filter;
- break;
- case 3 :
- filter = rgb_filter;
- break;
- case 4 :
- filter = rgba_filter;
- break;
- };
-
- /*
- * Sharpen...
- */
-
- for (y = sel_y1; y < sel_y2; y ++)
- {
- /*
- * Load the next pixel row...
- */
-
- if ((y + 1) < sel_y2)
- {
- /*
- * Check to see if our src_rows[] array is overflowing yet...
- */
-
- if (count >= 3)
- count --;
-
- /*
- * Grab the next row...
- */
-
- gimp_pixel_rgn_get_row (&src_rgn, src_rows[row],
- sel_x1, y + 1, sel_width);
- for (i = width, src_ptr = src_rows[row], neg_ptr = neg_rows[row];
- i > 0;
- i --, src_ptr ++, neg_ptr ++)
- *neg_ptr = neg_lut[*src_ptr];
-
- count ++;
- row = (row + 1) & 3;
- }
- else
- {
- /*
- * No more pixels at the bottom... Drop the oldest samples...
- */
-
- count --;
- };
-
- /*
- * Now sharpen pixels and save the results...
- */
-
- if (count == 3)
- {
- (* filter) (sel_width, src_rows[(row + 2) & 3], dst_row,
- neg_rows[(row + 1) & 3] + img_bpp,
- neg_rows[(row + 2) & 3] + img_bpp,
- neg_rows[(row + 3) & 3] + img_bpp);
-
- /*
- * Set the row...
- */
-
- gimp_pixel_rgn_set_row (&dst_rgn, dst_row, sel_x1, y, sel_width);
- }
- else if (count == 2)
- {
- if (y == sel_y1)
- gimp_pixel_rgn_set_row (&dst_rgn, src_rows[0], sel_x1, y, sel_width);
- else
- gimp_pixel_rgn_set_row (&dst_rgn, src_rows[2], sel_x1, y, sel_width);
- };
-
- if ((y & 15) == 0)
- gimp_progress_update ((gdouble) (y - sel_y1) / (gdouble) sel_height);
- };
-
- /*
- * OK, we're done. Free all memory used...
- */
-
- for (row = 0; row < 4; row ++)
- {
- g_free (src_rows[row]);
- g_free (neg_rows[row]);
- };
-
- g_free (dst_row);
-
- /*
- * Update the screen...
- */
-
- gimp_drawable_flush (drawable);
- gimp_drawable_merge_shadow (drawable->id, TRUE);
- gimp_drawable_update (drawable->id, sel_x1, sel_y1, sel_width, sel_height);
- }
-
-
- /*
- * 'sharpen_dialog()' - Popup a dialog window for the filter box size...
- */
-
- static gint
- sharpen_dialog (void)
- {
- GtkWidget *dialog;
- GtkWidget *vbox;
- GtkWidget *table;
- GtkWidget *abox;
- GtkWidget *ptable;
- GtkWidget *frame;
- GtkWidget *scrollbar;
- GtkObject *adj;
- gchar *title;
-
- gimp_ui_init ("sharpen", TRUE);
-
- title = g_strdup_printf (_("Sharpen - %s"), PLUG_IN_VERSION);
-
- dialog = gimp_dialog_new (title, "sharpen",
- gimp_standard_help_func, "filters/sharpen.html",
- GTK_WIN_POS_MOUSE,
- FALSE, TRUE, FALSE,
-
- _("OK"), dialog_ok_callback,
- NULL, NULL, NULL, TRUE, FALSE,
- _("Cancel"), gtk_widget_destroy,
- NULL, 1, NULL, FALSE, TRUE,
-
- NULL);
-
- g_free (title);
-
- gtk_signal_connect (GTK_OBJECT(dialog), "destroy",
- GTK_SIGNAL_FUNC (gtk_main_quit),
- NULL);
-
- /*
- * Top-level table for dialog...
- */
-
- vbox = gtk_vbox_new (FALSE, 4);
- gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
- gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox), vbox,
- FALSE, FALSE, 0);
- gtk_widget_show (vbox);
-
- /*
- * Preview window...
- */
-
- frame = gtk_frame_new (_("Preview"));
- gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
- gtk_widget_show (frame);
-
- abox = gtk_alignment_new (0.5, 0.5, 0.0, 0.0);
- gtk_container_set_border_width (GTK_CONTAINER (abox), 4);
- gtk_container_add (GTK_CONTAINER (frame), abox);
- gtk_widget_show (abox);
-
- ptable = gtk_table_new (2, 2, FALSE);
- gtk_container_add (GTK_CONTAINER (abox), ptable);
- gtk_widget_show (ptable);
-
- frame = gtk_frame_new (NULL);
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
- gtk_table_attach (GTK_TABLE (ptable), frame, 0, 1, 0, 1, 0, 0, 0, 0);
- gtk_widget_show (frame);
-
- preview_width = MIN (sel_width, PREVIEW_SIZE);
- preview_height = MIN (sel_height, PREVIEW_SIZE);
-
- preview = gtk_preview_new (GTK_PREVIEW_COLOR);
- gtk_preview_size (GTK_PREVIEW (preview), preview_width, preview_height);
- gtk_container_add (GTK_CONTAINER (frame), preview);
- gtk_widget_show (preview);
-
- hscroll_data = gtk_adjustment_new (0, 0, sel_width - 1, 1.0,
- MIN (preview_width, sel_width),
- MIN (preview_width, sel_width));
-
- gtk_signal_connect (hscroll_data, "value_changed",
- (GtkSignalFunc) preview_scroll_callback,
- NULL);
-
- scrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (hscroll_data));
- gtk_range_set_update_policy (GTK_RANGE (scrollbar), GTK_UPDATE_CONTINUOUS);
- gtk_table_attach (GTK_TABLE (ptable), scrollbar, 0, 1, 1, 2,
- GTK_FILL, 0, 0, 0);
- gtk_widget_show (scrollbar);
-
- vscroll_data = gtk_adjustment_new (0, 0, sel_height - 1, 1.0,
- MIN (preview_height, sel_height),
- MIN (preview_height, sel_height));
-
- gtk_signal_connect (vscroll_data, "value_changed",
- GTK_SIGNAL_FUNC (preview_scroll_callback),
- NULL);
-
- scrollbar = gtk_vscrollbar_new (GTK_ADJUSTMENT (vscroll_data));
- gtk_range_set_update_policy (GTK_RANGE (scrollbar), GTK_UPDATE_CONTINUOUS);
- gtk_table_attach (GTK_TABLE (ptable), scrollbar, 1, 2, 0, 1,
- 0, GTK_FILL, 0, 0);
- gtk_widget_show (scrollbar);
-
- preview_init ();
-
- /*
- * Sharpness control...
- */
-
- frame = gtk_frame_new (_("Parameter Settings"));
- gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
- gtk_widget_show (frame);
-
- table = gtk_table_new (1, 3, FALSE);
- gtk_table_set_col_spacings (GTK_TABLE (table), 4);
- gtk_container_set_border_width (GTK_CONTAINER (table), 4);
- gtk_container_add (GTK_CONTAINER (frame), table);
- gtk_widget_show (table);
-
- adj = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
- _("Sharpness:"), SCALE_WIDTH, 0,
- sharpen_percent, 1, 99, 1, 10, 0,
- TRUE, 0, 0,
- NULL, NULL);
- gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
- GTK_SIGNAL_FUNC (dialog_iscale_update),
- &sharpen_percent);
-
- gtk_widget_show (dialog);
-
- preview_update ();
-
- gtk_main ();
- gdk_flush ();
-
- preview_exit ();
-
- return run_filter;
- }
-
- /* preview functions */
-
- static void
- preview_init (void)
- {
- gint width; /* Byte width of the image */
-
- /*
- * Setup for preview filter...
- */
-
- compute_luts();
-
- width = preview_width * img_bpp;
-
- preview_src = g_new (guchar, width * preview_height);
- preview_neg = g_new (intneg, width * preview_height);
- preview_dst = g_new (guchar, width * preview_height);
- preview_image = g_new (guchar, preview_width * preview_height * 3);
-
- preview_x1 = sel_x1;
- preview_y1 = sel_y1;
- preview_x2 = preview_x1 + preview_width;
- preview_y2 = preview_y1 + preview_height;
- }
-
- static void
- preview_scroll_callback (void)
- {
- preview_x1 = sel_x1 + GTK_ADJUSTMENT (hscroll_data)->value;
- preview_y1 = sel_y1 + GTK_ADJUSTMENT (vscroll_data)->value;
- preview_x2 = preview_x1 + MIN (preview_width, sel_width);
- preview_y2 = preview_y1 + MIN (preview_height, sel_height);
-
- preview_update ();
- }
-
- static void
- preview_update (void)
- {
- GimpPixelRgn src_rgn; /* Source image region */
- guchar *src_ptr, /* Current source pixel */
- *dst_ptr, /* Current destination pixel */
- *image_ptr; /* Current image pixel */
- intneg *neg_ptr; /* Current negative pixel */
- guchar check; /* Current check mark pixel */
- gint i, /* Looping var */
- x, y, /* Current location in image */
- width; /* Byte width of the image */
- void (*filter)(int, guchar *, guchar *, intneg *, intneg *, intneg *);
-
- filter = NULL;
-
- /*
- * Setup for filter...
- */
-
- gimp_pixel_rgn_init (&src_rgn, drawable,
- preview_x1, preview_y1, preview_width, preview_height,
- FALSE, FALSE);
-
- width = preview_width * img_bpp;
-
- /*
- * Load the preview area...
- */
-
- gimp_pixel_rgn_get_rect (&src_rgn, preview_src, preview_x1, preview_y1,
- preview_width, preview_height);
-
- for (i = width * preview_height, src_ptr = preview_src, neg_ptr = preview_neg;
- i > 0;
- i --)
- *neg_ptr++ = neg_lut[*src_ptr++];
-
- /*
- * Select the filter...
- */
-
- switch (img_bpp)
- {
- case 1:
- filter = gray_filter;
- break;
- case 2:
- filter = graya_filter;
- break;
- case 3:
- filter = rgb_filter;
- break;
- case 4:
- filter = rgba_filter;
- break;
- };
-
- /*
- * Sharpen...
- */
-
- memcpy (preview_dst, preview_src, width);
- memcpy (preview_dst + width * (preview_height - 1),
- preview_src + width * (preview_height - 1),
- width);
-
- for (y = preview_height - 2, src_ptr = preview_src + width,
- neg_ptr = preview_neg + width + img_bpp,
- dst_ptr = preview_dst + width;
- y > 0;
- y --, src_ptr += width, neg_ptr += width, dst_ptr += width)
- (*filter)(preview_width, src_ptr, dst_ptr, neg_ptr - width,
- neg_ptr, neg_ptr + width);
-
- /*
- * Fill the preview image buffer...
- */
-
- switch (img_bpp)
- {
- case 1:
- for (x = preview_width * preview_height, dst_ptr = preview_dst,
- image_ptr = preview_image;
- x > 0;
- x --, dst_ptr ++, image_ptr += 3)
- image_ptr[0] = image_ptr[1] = image_ptr[2] = *dst_ptr;
- break;
-
- case 2:
- for (y = preview_height, dst_ptr = preview_dst,
- image_ptr = preview_image;
- y > 0;
- y --)
- for (x = preview_width;
- x > 0;
- x --, dst_ptr += 2, image_ptr += 3)
- if (dst_ptr[1] == 255)
- image_ptr[0] = image_ptr[1] = image_ptr[2] = *dst_ptr;
- else
- {
- if ((y & GIMP_CHECK_SIZE) ^ (x & GIMP_CHECK_SIZE))
- check = GIMP_CHECK_LIGHT * 255;
- else
- check = GIMP_CHECK_DARK * 255;
-
- if (dst_ptr[1] == 0)
- image_ptr[0] = image_ptr[1] = image_ptr[2] = check;
- else
- image_ptr[0] = image_ptr[1] = image_ptr[2] =
- check + ((dst_ptr[0] - check) * dst_ptr[1]) / 255;
- };
- break;
-
- case 3:
- memcpy (preview_image, preview_dst, preview_width * preview_height * 3);
- break;
-
- case 4:
- for (y = preview_height, dst_ptr = preview_dst,
- image_ptr = preview_image;
- y > 0;
- y --)
- for (x = preview_width;
- x > 0;
- x --, dst_ptr += 4, image_ptr += 3)
- if (dst_ptr[3] == 255)
- {
- image_ptr[0] = dst_ptr[0];
- image_ptr[1] = dst_ptr[1];
- image_ptr[2] = dst_ptr[2];
- }
- else
- {
- if ((y & GIMP_CHECK_SIZE) ^ (x & GIMP_CHECK_SIZE))
- check = GIMP_CHECK_LIGHT * 255;
- else
- check = GIMP_CHECK_DARK * 255;
-
- if (dst_ptr[3] == 0)
- image_ptr[0] = image_ptr[1] = image_ptr[2] = check;
- else
- {
- image_ptr[0] =
- check + ((dst_ptr[0] - check) * dst_ptr[3]) / 255;
- image_ptr[1] =
- check + ((dst_ptr[1] - check) * dst_ptr[3]) / 255;
- image_ptr[2] =
- check + ((dst_ptr[2] - check) * dst_ptr[3]) / 255;
- };
- };
- break;
- };
-
- /*
- * Draw the preview image on the screen...
- */
-
- for (y = 0, image_ptr = preview_image;
- y < preview_height;
- y ++, image_ptr += preview_width * 3)
- gtk_preview_draw_row (GTK_PREVIEW (preview), image_ptr, 0, y,
- preview_width);
-
- gtk_widget_draw (preview, NULL);
- gdk_flush ();
- }
-
- static void
- preview_exit (void)
- {
- g_free (preview_src);
- g_free (preview_neg);
- g_free (preview_dst);
- g_free (preview_image);
- }
-
- /* dialog callbacks */
-
- static void
- dialog_iscale_update (GtkAdjustment *adjustment,
- gint *value)
- {
- gimp_int_adjustment_update (adjustment, value);
-
- compute_luts ();
- preview_update ();
- }
-
- static void
- dialog_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- run_filter = TRUE;
-
- gtk_widget_destroy (GTK_WIDGET (data));
- }
-
-
- /*
- * 'gray_filter()' - Sharpen grayscale pixels.
- */
-
- static void
- gray_filter (gint width, /* I - Width of line in pixels */
- guchar *src, /* I - Source line */
- guchar *dst, /* O - Destination line */
- intneg *neg0, /* I - Top negative coefficient line */
- intneg *neg1, /* I - Middle negative coefficient line */
- intneg *neg2) /* I - Bottom negative coefficient line */
- {
- intpos pixel; /* New pixel value */
-
- *dst++ = *src++;
- width -= 2;
-
- while (width > 0)
- {
- pixel = (pos_lut[*src++] - neg0[-1] - neg0[0] - neg0[1] -
- neg1[-1] - neg1[1] -
- neg2[-1] - neg2[0] - neg2[1]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- neg0 ++;
- neg1 ++;
- neg2 ++;
- width --;
- };
-
- *dst++ = *src++;
- }
-
- /*
- * 'graya_filter()' - Sharpen grayscale+alpha pixels.
- */
-
- static void
- graya_filter (gint width, /* I - Width of line in pixels */
- guchar *src, /* I - Source line */
- guchar *dst, /* O - Destination line */
- intneg *neg0, /* I - Top negative coefficient line */
- intneg *neg1, /* I - Middle negative coefficient line */
- intneg *neg2) /* I - Bottom negative coefficient line */
- {
- intpos pixel; /* New pixel value */
-
- *dst++ = *src++;
- *dst++ = *src++;
- width -= 2;
-
- while (width > 0)
- {
- pixel = (pos_lut[*src++] - neg0[-2] - neg0[0] - neg0[2] -
- neg1[-2] - neg1[2] -
- neg2[-2] - neg2[0] - neg2[2]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- *dst++ = *src++;
- neg0 += 2;
- neg1 += 2;
- neg2 += 2;
- width --;
- };
-
- *dst++ = *src++;
- *dst++ = *src++;
- }
-
- /*
- * 'rgb_filter()' - Sharpen RGB pixels.
- */
-
- static void
- rgb_filter (gint width, /* I - Width of line in pixels */
- guchar *src, /* I - Source line */
- guchar *dst, /* O - Destination line */
- intneg *neg0, /* I - Top negative coefficient line */
- intneg *neg1, /* I - Middle negative coefficient line */
- intneg *neg2) /* I - Bottom negative coefficient line */
- {
- intpos pixel; /* New pixel value */
-
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- width -= 2;
-
- while (width > 0)
- {
- pixel = (pos_lut[*src++] - neg0[-3] - neg0[0] - neg0[3] -
- neg1[-3] - neg1[3] -
- neg2[-3] - neg2[0] - neg2[3]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- pixel = (pos_lut[*src++] - neg0[-2] - neg0[1] - neg0[4] -
- neg1[-2] - neg1[4] -
- neg2[-2] - neg2[1] - neg2[4]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- pixel = (pos_lut[*src++] - neg0[-1] - neg0[2] - neg0[5] -
- neg1[-1] - neg1[5] -
- neg2[-1] - neg2[2] - neg2[5]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- neg0 += 3;
- neg1 += 3;
- neg2 += 3;
- width --;
- };
-
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- }
-
- /*
- * 'rgba_filter()' - Sharpen RGBA pixels.
- */
-
- static void
- rgba_filter (gint width, /* I - Width of line in pixels */
- guchar *src, /* I - Source line */
- guchar *dst, /* O - Destination line */
- intneg *neg0, /* I - Top negative coefficient line */
- intneg *neg1, /* I - Middle negative coefficient line */
- intneg *neg2) /* I - Bottom negative coefficient line */
- {
- intpos pixel; /* New pixel value */
-
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- width -= 2;
-
- while (width > 0)
- {
- pixel = (pos_lut[*src++] - neg0[-4] - neg0[0] - neg0[4] -
- neg1[-4] - neg1[4] -
- neg2[-4] - neg2[0] - neg2[4]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- pixel = (pos_lut[*src++] - neg0[-3] - neg0[1] - neg0[5] -
- neg1[-3] - neg1[5] -
- neg2[-3] - neg2[1] - neg2[5]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- pixel = (pos_lut[*src++] - neg0[-2] - neg0[2] - neg0[6] -
- neg1[-2] - neg1[6] -
- neg2[-2] - neg2[2] - neg2[6]);
- pixel = (pixel + 4) >> 3;
- if (pixel < 0)
- *dst++ = 0;
- else if (pixel < 255)
- *dst++ = pixel;
- else
- *dst++ = 255;
-
- *dst++ = *src++;
-
- neg0 += 4;
- neg1 += 4;
- neg2 += 4;
- width --;
- };
-
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- *dst++ = *src++;
- }
-