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gimp/app/threshold.c

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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 <stdlib.h>
#include <string.h>
#include <math.h>
#include "appenv.h"
#include "drawable.h"
#include "general.h"
#include "gdisplay.h"
#include "gimpui.h"
#include "interface.h"
#include "threshold.h"
#include "libgimp/gimpintl.h"
#define TEXT_WIDTH 45
#define HISTOGRAM_WIDTH 256
#define HISTOGRAM_HEIGHT 150
/* the threshold structures */
typedef struct _Threshold Threshold;
struct _Threshold
{
int 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_new_dialog (void);
static void threshold_preview (ThresholdDialog *);
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_text_update (GtkWidget *, gpointer);
static void threshold_high_threshold_text_update (GtkWidget *, gpointer);
static void threshold (PixelRegion *, PixelRegion *, void *);
static void threshold_histogram_range (HistogramWidget *, int, int, void *);
/* threshold machinery */
void
threshold_2 (void *user_data,
PixelRegion *srcPR,
PixelRegion *destPR)
{
/* this function just re-orders the arguments so we can use
pixel_regions_process_paralell */
threshold(srcPR, destPR, user_data);
}
static void
threshold (PixelRegion *srcPR,
PixelRegion *destPR,
void *user_data)
{
ThresholdDialog *td;
unsigned char *src, *s;
unsigned char *dest, *d;
int has_alpha, alpha;
int w, h, b;
int value;
td = (ThresholdDialog *) user_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;
}
}
static void
threshold_histogram_range (HistogramWidget *w,
int start,
int end,
void *user_data)
{
ThresholdDialog *td;
char text[12];
td = (ThresholdDialog *) user_data;
td->low_threshold = start;
td->high_threshold = end;
sprintf (text, "%d", start);
gtk_entry_set_text (GTK_ENTRY (td->low_threshold_text), text);
sprintf (text, "%d", end);
gtk_entry_set_text (GTK_ENTRY (td->high_threshold_text), text);
if (td->preview)
threshold_preview (td);
}
/* threshold action functions */
static void
threshold_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
switch (action)
{
case PAUSE:
break;
case RESUME:
break;
case HALT:
if (threshold_dialog)
threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
break;
default:
break;
}
}
Tool *
tools_new_threshold ()
{
Tool * tool;
Threshold * private;
/* The tool options */
if (! threshold_options)
{
threshold_options = tool_options_new (_("Threshold Options"));
tools_register (THRESHOLD, threshold_options);
}
/* The threshold dialog */
if (! threshold_dialog)
threshold_dialog = threshold_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (threshold_dialog->shell))
gtk_widget_show (threshold_dialog->shell);
tool = tools_new_tool (THRESHOLD);
private = g_new (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
tools_free_threshold (Tool *tool)
{
Threshold * thresh;
thresh = (Threshold *) tool->private;
/* Close the color select dialog */
if (threshold_dialog)
threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
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_new_dialog ();
else
if (!GTK_WIDGET_VISIBLE (threshold_dialog->shell))
gtk_widget_show (threshold_dialog->shell);
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);
histogram_widget_update (threshold_dialog->histogram,
threshold_dialog->hist);
histogram_widget_range (threshold_dialog->histogram,
threshold_dialog->low_threshold,
threshold_dialog->high_threshold);
if (threshold_dialog->preview)
threshold_preview (threshold_dialog);
}
/**********************/
/* Threshold dialog */
/**********************/
static ThresholdDialog *
threshold_new_dialog ()
{
ThresholdDialog *td;
GtkWidget *vbox;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *frame;
GtkWidget *toggle;
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, TRUE, FALSE,
_("Cancel"), threshold_cancel_callback,
td, NULL, FALSE, TRUE,
NULL);
vbox = gtk_vbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 2);
gtk_container_add (GTK_CONTAINER (GTK_DIALOG (td->shell)->vbox), vbox);
/* Horizontal box for threshold text widget */
hbox = gtk_hbox_new (TRUE, 2);
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 text */
td->low_threshold_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (td->low_threshold_text), "127");
gtk_widget_set_usize (td->low_threshold_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), td->low_threshold_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (td->low_threshold_text), "changed",
(GtkSignalFunc) threshold_low_threshold_text_update,
td);
gtk_widget_show (td->low_threshold_text);
/* high threshold text */
td->high_threshold_text = gtk_entry_new ();
gtk_entry_set_text (GTK_ENTRY (td->high_threshold_text), "255");
gtk_widget_set_usize (td->high_threshold_text, TEXT_WIDTH, 25);
gtk_box_pack_start (GTK_BOX (hbox), td->high_threshold_text, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (td->high_threshold_text), "changed",
(GtkSignalFunc) threshold_high_threshold_text_update,
td);
gtk_widget_show (td->high_threshold_text);
gtk_widget_show (hbox);
/* The threshold histogram */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, 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_signal_connect (GTK_OBJECT (td->histogram), "rangechanged",
(GtkSignalFunc) threshold_histogram_range,
(void*)td);
gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET(td->histogram));
gtk_widget_show (GTK_WIDGET(td->histogram));
gtk_widget_show (frame);
gtk_widget_show (hbox);
/* Horizontal box for preview */
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (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_start (GTK_BOX (hbox), toggle, TRUE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (toggle), "toggled",
(GtkSignalFunc) threshold_preview_update,
td);
gtk_widget_show (label);
gtk_widget_show (toggle);
gtk_widget_show (hbox);
gtk_widget_show (vbox);
gtk_widget_show (td->shell);
/* This code is so far removed from the histogram creation because the
function histogram_range requires a non-NULL drawable, and that
doesn't happen until after the top-level dialog is shown. */
histogram_widget_range (td->histogram, td->low_threshold, td->high_threshold);
return td;
}
static void
threshold_preview (ThresholdDialog *td)
{
if (!td->image_map)
g_warning ("threshold_preview(): No image map");
image_map_apply (td->image_map, threshold, (void *) td);
}
static void
threshold_ok_callback (GtkWidget *widget,
gpointer client_data)
{
ThresholdDialog *td;
td = (ThresholdDialog *) client_data;
if (GTK_WIDGET_VISIBLE (td->shell))
gtk_widget_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 client_data)
{
ThresholdDialog *td;
td = (ThresholdDialog *) client_data;
if (GTK_WIDGET_VISIBLE (td->shell))
gtk_widget_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 *w,
gpointer data)
{
ThresholdDialog *td;
td = (ThresholdDialog *) data;
if (GTK_TOGGLE_BUTTON (w)->active)
{
td->preview = TRUE;
threshold_preview (td);
}
else
td->preview = FALSE;
}
static void
threshold_low_threshold_text_update (GtkWidget *w,
gpointer data)
{
ThresholdDialog *td;
char *str;
int value;
td = (ThresholdDialog *) data;
str = gtk_entry_get_text (GTK_ENTRY (w));
value = BOUNDS (((int) atof (str)), 0, td->high_threshold);
if (value != td->low_threshold)
{
td->low_threshold = value;
histogram_widget_range (td->histogram,
td->low_threshold,
td->high_threshold);
if (td->preview)
threshold_preview (td);
}
}
static void
threshold_high_threshold_text_update (GtkWidget *w,
gpointer data)
{
ThresholdDialog *td;
char *str;
int value;
td = (ThresholdDialog *) data;
str = gtk_entry_get_text (GTK_ENTRY (w));
value = BOUNDS (((int) atof (str)), td->low_threshold, 255);
if (value != td->high_threshold)
{
td->high_threshold = value;
histogram_widget_range (td->histogram,
td->low_threshold,
td->high_threshold);
if (td->preview)
threshold_preview (td);
}
}
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