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gimp/app/widgets/gimphistogrambox.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 "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "base/gimphistogram.h"
#include "gimphistogrambox.h"
#include "gimphistogramview.h"
#include "gimp-intl.h"
#define GRADIENT_HEIGHT 15
/* local function prototypes */
static void gimp_histogram_box_class_init (GimpHistogramBoxClass *klass);
static void gimp_histogram_box_init (GimpHistogramBox *histogram_box);
static void gimp_histogram_box_finalize (GObject *object);
static void gimp_histogram_box_low_adj_update (GtkAdjustment *adj,
GimpHistogramBox *box);
static void gimp_histogram_box_high_adj_update (GtkAdjustment *adj,
GimpHistogramBox *box);
static void gimp_histogram_box_histogram_range (GimpHistogramView *view,
gint start,
gint end,
GimpHistogramBox *box);
static void gimp_histogram_box_gradient_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
gpointer data);
static gboolean gimp_histogram_box_gradient_expose (GtkWidget *widget,
GdkEventExpose *event,
gpointer data);
static GtkVBoxClass *parent_class = NULL;
GType
gimp_histogram_box_get_type (void)
{
static GType box_type = 0;
if (! box_type)
{
static const GTypeInfo box_info =
{
sizeof (GimpHistogramBoxClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_histogram_box_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpHistogramBox),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_histogram_box_init,
};
box_type = g_type_register_static (GTK_TYPE_VBOX,
"GimpHistogramBox",
&box_info, 0);
}
return box_type;
}
static void
gimp_histogram_box_class_init (GimpHistogramBoxClass *klass)
{
GObjectClass *object_class;
parent_class = g_type_class_peek_parent (klass);
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gimp_histogram_box_finalize;
}
static void
gimp_histogram_box_init (GimpHistogramBox *box)
{
GtkWidget *hbox;
GtkWidget *spinbutton;
GtkObject *adjustment;
GtkWidget *frame;
GtkWidget *view;
gtk_box_set_spacing (GTK_BOX (box), 4);
hbox = gtk_hbox_new (FALSE, 4);
gtk_box_pack_start (GTK_BOX (box), hbox, FALSE, FALSE, 0);
gtk_widget_show (hbox);
box->label = gtk_label_new (NULL);
gtk_box_pack_start (GTK_BOX (hbox), box->label, FALSE, FALSE, 0);
gtk_widget_show (box->label);
/* low spinbutton */
spinbutton = gimp_spin_button_new (&adjustment,
0.0, 0.0, 255.0, 1.0, 16.0, 0.0,
1.0, 0);
box->low_adj = GTK_ADJUSTMENT (adjustment);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
g_signal_connect (adjustment, "value_changed",
G_CALLBACK (gimp_histogram_box_low_adj_update),
box);
/* high spinbutton */
spinbutton = gimp_spin_button_new (&adjustment,
255.0, 0.0, 255.0, 1.0, 16.0, 0.0,
1.0, 0);
box->high_adj = GTK_ADJUSTMENT (adjustment);
gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
g_signal_connect (adjustment, "value_changed",
G_CALLBACK (gimp_histogram_box_high_adj_update),
box);
/* The histogram */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (box), frame, TRUE, TRUE, 0);
gtk_widget_show (frame);
view = gimp_histogram_view_new (GIMP_HISTOGRAM_VIEW_WIDTH,
GIMP_HISTOGRAM_VIEW_HEIGHT,
TRUE);
gtk_container_add (GTK_CONTAINER (frame), view);
gtk_widget_show (view);
g_signal_connect (view, "range_changed",
G_CALLBACK (gimp_histogram_box_histogram_range),
box);
box->histogram = GIMP_HISTOGRAM_VIEW (view);
/* The gradient below the histogram */
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (box), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
box->gradient = gtk_drawing_area_new ();
gtk_widget_set_size_request (box->gradient,
GIMP_HISTOGRAM_VIEW_WIDTH, GRADIENT_HEIGHT);
gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (box->gradient));
gtk_widget_show (box->gradient);
g_signal_connect (box->gradient, "size_allocate",
G_CALLBACK (gimp_histogram_box_gradient_size_allocate),
box);
g_signal_connect (box->gradient, "expose_event",
G_CALLBACK (gimp_histogram_box_gradient_expose),
box);
g_signal_connect_swapped (view, "notify::channel",
G_CALLBACK (gtk_widget_queue_draw),
box->gradient);
}
static void
gimp_histogram_box_finalize (GObject *object)
{
GimpHistogramBox *box = GIMP_HISTOGRAM_BOX (object);
g_free (box->gradient_buf);
box->gradient_buf = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_histogram_box_low_adj_update (GtkAdjustment *adjustment,
GimpHistogramBox *box)
{
if ((gdouble) box->histogram->start == adjustment->value)
return;
box->high_adj->lower = adjustment->value;
gtk_adjustment_changed (box->high_adj);
gimp_histogram_view_set_range (box->histogram,
adjustment->value, box->histogram->end);
}
static void
gimp_histogram_box_high_adj_update (GtkAdjustment *adjustment,
GimpHistogramBox *box)
{
if ((gdouble) box->histogram->end == adjustment->value)
return;
box->low_adj->upper = adjustment->value;
gtk_adjustment_changed (box->low_adj);
gimp_histogram_view_set_range (box->histogram,
box->histogram->start, adjustment->value);
}
static void
gimp_histogram_box_histogram_range (GimpHistogramView *widget,
gint start,
gint end,
GimpHistogramBox *box)
{
box->high_adj->lower = start;
box->low_adj->upper = end;
gtk_adjustment_changed (box->high_adj);
gtk_adjustment_changed (box->low_adj);
gtk_adjustment_set_value (box->low_adj, start);
gtk_adjustment_set_value (box->high_adj, end);
}
static void
gimp_histogram_box_gradient_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
gpointer data)
{
GimpHistogramBox *box = GIMP_HISTOGRAM_BOX (data);
box->gradient_buf = g_realloc (box->gradient_buf,
3 * ((allocation->width - 2) *
(allocation->height - 2)));
}
static gboolean
gimp_histogram_box_gradient_expose (GtkWidget *widget,
GdkEventExpose *event,
gpointer data)
{
GimpHistogramBox *box = GIMP_HISTOGRAM_BOX (data);
GimpHistogramChannel channel;
gint i;
gint width, height;
guchar r, g, b;
width = widget->allocation.width - 2;
height = widget->allocation.height - 2;
if (width <= 0 || height <= 0)
return TRUE;
if (box->histogram)
channel = box->histogram->channel;
else
channel = GIMP_HISTOGRAM_VALUE;
switch (channel)
{
case GIMP_HISTOGRAM_VALUE:
case GIMP_HISTOGRAM_ALPHA: r = g = b = 1;
break;
case GIMP_HISTOGRAM_RED: r = 1; g = b = 0;
break;
case GIMP_HISTOGRAM_GREEN: g = 1; r = b = 0;
break;
case GIMP_HISTOGRAM_BLUE: b = 1; r = g = 0;
break;
default:
r = g = b = 0;
g_assert_not_reached ();
break;
}
for (i = 0; i < width; i++)
{
guchar *buffer = box->gradient_buf + 3 * i;
gint x = (i * 256) / width;
buffer[0] = x * r;
buffer[1] = x * g;
buffer[2] = x * b;
}
for (i = 1; i < height; i++)
memcpy (box->gradient_buf + 3 * i * width, box->gradient_buf, 3 * width);
gdk_draw_rgb_image (widget->window, widget->style->black_gc,
1, 1, width, height, GDK_RGB_DITHER_NORMAL,
box->gradient_buf, 3 * width);
return TRUE;
}
GtkWidget *
gimp_histogram_box_new (const gchar *label)
{
GimpHistogramBox *box;
box = g_object_new (GIMP_TYPE_HISTOGRAM_BOX, NULL);
gtk_label_set_text (GTK_LABEL (box->label), label);
return GTK_WIDGET (box);
}
void
gimp_histogram_box_set_channel (GimpHistogramBox *box,
GimpHistogramChannel channel)
{
g_return_if_fail (GIMP_IS_HISTOGRAM_BOX (box));
if (!box->histogram)
return;
gimp_histogram_view_set_channel (box->histogram, channel);
}
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