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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 "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 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:
if (threshold_dialog)
threshold_cancel_callback (NULL, (gpointer) threshold_dialog);
break;
default:
break;
}
}
Tool *
tools_new_threshold (void)
{
Tool * tool;
Threshold * private;
/* The tool options */
if (! threshold_options)
{
threshold_options = tool_options_new (_("Threshold Options"));
tools_register (THRESHOLD, threshold_options);
}
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 threshold 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_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), "rangechanged",
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;
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 data)
{
ThresholdDialog *td;
td = (ThresholdDialog *) 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 *widget,
gpointer data)
{
ThresholdDialog *td;
td = (ThresholdDialog *) data;
if (GTK_TOGGLE_BUTTON (widget)->active)
{
td->preview = TRUE;
threshold_preview (td);
}
else
td->preview = FALSE;
}
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);
}
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