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- /* The GIMP -- an 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 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.
- */
-
- #include "config.h"
-
- #include <glib.h>
-
- #include "apptypes.h"
-
- #include "appenv.h"
- #include "drawable.h"
- #include "gdisplay.h"
- #include "gimpui.h"
- #include "threshold.h"
-
- #include "libgimp/gimpintl.h"
-
-
- #define HISTOGRAM_WIDTH 256
- #define HISTOGRAM_HEIGHT 150
-
- #define LOW 0x1
- #define HIGH 0x2
- #define HISTORGAM 0x4
- #define ALL (LOW | HIGH | HISTOGRAM)
-
- /* the threshold structures */
-
- typedef struct _Threshold Threshold;
-
- struct _Threshold
- {
- gint x, y; /* coords for last mouse click */
- };
-
- /* the threshold tool options */
- static ToolOptions *threshold_options = NULL;
-
- /* the threshold tool dialog */
- static ThresholdDialog *threshold_dialog = NULL;
-
- /* threshold action functions */
- static void threshold_control (Tool *, ToolAction, gpointer);
-
- static ThresholdDialog * threshold_dialog_new (void);
-
- static void threshold_update (ThresholdDialog *,
- gint);
- static void threshold_preview (ThresholdDialog *);
- static void threshold_reset_callback (GtkWidget *, gpointer);
- static void threshold_ok_callback (GtkWidget *, gpointer);
- static void threshold_cancel_callback (GtkWidget *, gpointer);
- static void threshold_preview_update (GtkWidget *, gpointer);
- static void threshold_low_threshold_adjustment_update (GtkAdjustment *,
- gpointer);
- static void threshold_high_threshold_adjustment_update (GtkAdjustment *,
- gpointer);
-
- static void threshold (PixelRegion *, PixelRegion *, void *);
- static void threshold_histogram_range (HistogramWidget *, gint, gint,
- gpointer);
- /* threshold machinery */
-
- void
- threshold_2 (void *data,
- PixelRegion *srcPR,
- PixelRegion *destPR)
- {
- /* this function just re-orders the arguments so we can use
- * pixel_regions_process_paralell
- */
- threshold (srcPR, destPR, data);
- }
-
- static void
- threshold (PixelRegion *srcPR,
- PixelRegion *destPR,
- void *data)
- {
- ThresholdDialog *td;
- unsigned char *src, *s;
- unsigned char *dest, *d;
- int has_alpha, alpha;
- int w, h, b;
- int value;
-
- td = (ThresholdDialog *) data;
-
- h = srcPR->h;
- src = srcPR->data;
- dest = destPR->data;
- has_alpha = (srcPR->bytes == 2 || srcPR->bytes == 4);
- alpha = has_alpha ? srcPR->bytes - 1 : srcPR->bytes;
-
- while (h--)
- {
- w = srcPR->w;
- s = src;
- d = dest;
- while (w--)
- {
- if (td->color)
- {
- value = MAX (s[RED_PIX], s[GREEN_PIX]);
- value = MAX (value, s[BLUE_PIX]);
-
- value = (value >= td->low_threshold && value <= td->high_threshold ) ? 255 : 0;
- }
- else
- value = (s[GRAY_PIX] >= td->low_threshold && s[GRAY_PIX] <= td->high_threshold) ? 255 : 0;
-
- for (b = 0; b < alpha; b++)
- d[b] = value;
-
- if (has_alpha)
- d[alpha] = s[alpha];
-
- s += srcPR->bytes;
- d += destPR->bytes;
- }
-
- src += srcPR->rowstride;
- dest += destPR->rowstride;
- }
- }
-
- /* threshold action functions */
-
- static void
- threshold_control (Tool *tool,
- ToolAction action,
- gpointer gdisp_ptr)
- {
- switch (action)
- {
- case PAUSE:
- break;
-
- case RESUME:
- break;
-
- case HALT:
- threshold_dialog_hide ();
- break;
-
- default:
- break;
- }
- }
-
- Tool *
- tools_new_threshold (void)
- {
- Tool * tool;
- Threshold * private;
-
- /* The tool options */
- if (! threshold_options)
- {
- threshold_options = tool_options_new (_("Threshold"));
- tools_register (THRESHOLD, threshold_options);
- }
-
- tool = tools_new_tool (THRESHOLD);
- private = g_new0 (Threshold, 1);
-
- tool->scroll_lock = TRUE; /* Disallow scrolling */
- tool->preserve = FALSE; /* Don't preserve on drawable change */
-
- tool->private = (void *) private;
-
- tool->control_func = threshold_control;
-
- return tool;
- }
-
- void
- threshold_dialog_hide (void)
- {
- if (threshold_dialog)
- threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
- }
-
- void
- tools_free_threshold (Tool *tool)
- {
- Threshold * thresh;
-
- thresh = (Threshold *) tool->private;
-
- /* Close the threshold dialog */
- threshold_dialog_hide ();
-
- g_free (thresh);
- }
-
- void
- threshold_initialize (GDisplay *gdisp)
- {
- if (drawable_indexed (gimage_active_drawable (gdisp->gimage)))
- {
- g_message (_("Threshold does not operate on indexed drawables."));
- return;
- }
-
- /* The threshold dialog */
- if (!threshold_dialog)
- threshold_dialog = threshold_dialog_new ();
- else
- if (!GTK_WIDGET_VISIBLE (threshold_dialog->shell))
- gtk_widget_show (threshold_dialog->shell);
-
- threshold_dialog->low_threshold = 127;
- threshold_dialog->high_threshold = 255;
-
- threshold_dialog->drawable = gimage_active_drawable (gdisp->gimage);
- threshold_dialog->color = drawable_color (threshold_dialog->drawable);
- threshold_dialog->image_map =
- image_map_create (gdisp, threshold_dialog->drawable);
-
- gimp_histogram_calculate_drawable (threshold_dialog->hist,
- threshold_dialog->drawable);
-
- gtk_signal_handler_block_by_data (GTK_OBJECT (threshold_dialog->histogram),
- threshold_dialog);
- histogram_widget_update (threshold_dialog->histogram,
- threshold_dialog->hist);
- gtk_signal_handler_unblock_by_data (GTK_OBJECT (threshold_dialog->histogram),
- threshold_dialog);
-
- threshold_update (threshold_dialog, ALL);
-
- if (threshold_dialog->preview)
- threshold_preview (threshold_dialog);
- }
-
- /**********************/
- /* Threshold dialog */
- /**********************/
-
- static ThresholdDialog *
- threshold_dialog_new (void)
- {
- ThresholdDialog *td;
- GtkWidget *vbox;
- GtkWidget *hbox;
- GtkWidget *spinbutton;
- GtkWidget *label;
- GtkWidget *frame;
- GtkWidget *toggle;
- GtkObject *data;
-
- td = g_new (ThresholdDialog, 1);
- td->preview = TRUE;
- td->low_threshold = 127;
- td->high_threshold = 255;
- td->hist = gimp_histogram_new ();
-
- /* The shell and main vbox */
- td->shell =
- gimp_dialog_new (_("Threshold"), "threshold",
- tools_help_func, NULL,
- GTK_WIN_POS_NONE,
- FALSE, TRUE, FALSE,
-
- _("OK"), threshold_ok_callback,
- td, NULL, NULL, TRUE, FALSE,
- _("Reset"), threshold_reset_callback,
- td, NULL, NULL, TRUE, FALSE,
- _("Cancel"), threshold_cancel_callback,
- td, NULL, NULL, FALSE, TRUE,
-
- NULL);
-
- vbox = gtk_vbox_new (FALSE, 4);
- gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
- gtk_container_add (GTK_CONTAINER (GTK_DIALOG (td->shell)->vbox), vbox);
-
- /* Horizontal box for threshold text widget */
- hbox = gtk_hbox_new (FALSE, 4);
- gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
-
- label = gtk_label_new (_("Threshold Range:"));
- gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
- gtk_widget_show (label);
-
- /* low threshold spinbutton */
- data = gtk_adjustment_new (td->low_threshold, 0.0, 255.0, 1.0, 10.0, 0.0);
- td->low_threshold_data = GTK_ADJUSTMENT (data);
-
- spinbutton = gtk_spin_button_new (td->low_threshold_data, 1.0, 0);
- gtk_widget_set_usize (spinbutton, 75, -1);
- gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
-
- gtk_signal_connect (GTK_OBJECT (td->low_threshold_data), "value_changed",
- GTK_SIGNAL_FUNC (threshold_low_threshold_adjustment_update),
- td);
-
- gtk_widget_show (spinbutton);
-
- /* high threshold spinbutton */
- data = gtk_adjustment_new (td->high_threshold, 0.0, 255.0, 1.0, 10.0, 0.0);
- td->high_threshold_data = GTK_ADJUSTMENT (data);
-
- spinbutton = gtk_spin_button_new (td->high_threshold_data, 1.0, 0);
- gtk_widget_set_usize (spinbutton, 75, -1);
- gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
-
- gtk_signal_connect (GTK_OBJECT (td->high_threshold_data), "value_changed",
- GTK_SIGNAL_FUNC (threshold_high_threshold_adjustment_update),
- td);
-
- gtk_widget_show (spinbutton);
-
- gtk_widget_show (hbox);
-
- /* The threshold histogram */
- hbox = gtk_hbox_new (TRUE, 0);
- gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
-
- frame = gtk_frame_new (NULL);
- gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_IN);
- gtk_box_pack_start (GTK_BOX (hbox), frame, TRUE, FALSE, 0);
-
- td->histogram = histogram_widget_new (HISTOGRAM_WIDTH, HISTOGRAM_HEIGHT);
-
- gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (td->histogram));
-
- gtk_signal_connect (GTK_OBJECT (td->histogram), "range_changed",
- GTK_SIGNAL_FUNC (threshold_histogram_range),
- td);
-
- gtk_widget_show (GTK_WIDGET(td->histogram));
-
- gtk_widget_show (frame);
- gtk_widget_show (hbox);
-
- /* Horizontal box for preview */
- hbox = gtk_hbox_new (FALSE, 4);
- gtk_box_pack_end (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
-
- /* The preview toggle */
- toggle = gtk_check_button_new_with_label (_("Preview"));
- gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), td->preview);
- gtk_box_pack_end (GTK_BOX (hbox), toggle, FALSE, FALSE, 0);
-
- gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
- GTK_SIGNAL_FUNC (threshold_preview_update),
- td);
-
- gtk_widget_show (toggle);
- gtk_widget_show (hbox);
-
- gtk_widget_show (vbox);
- gtk_widget_show (td->shell);
-
- return td;
- }
-
- static void
- threshold_update (ThresholdDialog *td,
- gint update)
- {
- if (update & LOW)
- {
- gtk_adjustment_set_value (td->low_threshold_data, td->low_threshold);
- }
- if (update & HIGH)
- {
- gtk_adjustment_set_value (td->high_threshold_data, td->high_threshold);
- }
- if (update & HISTOGRAM)
- {
- histogram_widget_range (td->histogram,
- td->low_threshold,
- td->high_threshold);
- }
- }
-
- static void
- threshold_preview (ThresholdDialog *td)
- {
- if (!td->image_map)
- {
- g_warning ("threshold_preview(): No image map");
- return;
- }
-
- active_tool->preserve = TRUE;
- image_map_apply (td->image_map, threshold, td);
- active_tool->preserve = FALSE;
- }
-
- static void
- threshold_reset_callback (GtkWidget *widget,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- td->low_threshold = 127.0;
- td->high_threshold = 255.0;
-
- threshold_update (td, ALL);
-
- if (td->preview)
- threshold_preview (td);
- }
-
- static void
- threshold_ok_callback (GtkWidget *widget,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- gimp_dialog_hide (td->shell);
-
- active_tool->preserve = TRUE;
-
- if (!td->preview)
- image_map_apply (td->image_map, threshold, (void *) td);
-
- if (td->image_map)
- image_map_commit (td->image_map);
-
- active_tool->preserve = FALSE;
-
- td->image_map = NULL;
-
- active_tool->gdisp_ptr = NULL;
- active_tool->drawable = NULL;
- }
-
- static void
- threshold_cancel_callback (GtkWidget *widget,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- gimp_dialog_hide (td->shell);
-
- if (td->image_map)
- {
- active_tool->preserve = TRUE;
- image_map_abort (td->image_map);
- active_tool->preserve = FALSE;
-
- td->image_map = NULL;
- gdisplays_flush ();
- }
-
- active_tool->gdisp_ptr = NULL;
- active_tool->drawable = NULL;
- }
-
- static void
- threshold_preview_update (GtkWidget *widget,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- if (GTK_TOGGLE_BUTTON (widget)->active)
- {
- td->preview = TRUE;
- threshold_preview (td);
- }
- else
- {
- td->preview = FALSE;
- if (td->image_map)
- {
- active_tool->preserve = TRUE;
- image_map_clear (td->image_map);
- active_tool->preserve = FALSE;
- gdisplays_flush ();
- }
- }
- }
-
- static void
- threshold_low_threshold_adjustment_update (GtkAdjustment *adjustment,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- if (td->low_threshold != adjustment->value)
- {
- td->low_threshold = adjustment->value;
-
- threshold_update (td, HISTOGRAM);
-
- if (td->preview)
- threshold_preview (td);
- }
- }
-
- static void
- threshold_high_threshold_adjustment_update (GtkAdjustment *adjustment,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- if (td->high_threshold != adjustment->value)
- {
- td->high_threshold = adjustment->value;
-
- threshold_update (td, HISTOGRAM);
-
- if (td->preview)
- threshold_preview (td);
- }
- }
-
- static void
- threshold_histogram_range (HistogramWidget *widget,
- gint start,
- gint end,
- gpointer data)
- {
- ThresholdDialog *td;
-
- td = (ThresholdDialog *) data;
-
- td->low_threshold = start;
- td->high_threshold = end;
-
- threshold_update (td, LOW | HIGH);
-
- if (td->preview)
- threshold_preview (td);
- }
-