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gimp/modules/cdisplay_highcontrast.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1999 Manish Singh <yosh@gimp.org>
*
* 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 "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpmodule/gimpmodule.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "libgimp/libgimp-intl.h"
#define DEFAULT_CONTRAST 4.0
#define CDISPLAY_TYPE_CONTRAST (cdisplay_contrast_type)
#define CDISPLAY_CONTRAST(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_CONTRAST, CdisplayContrast))
#define CDISPLAY_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_CONTRAST, CdisplayContrastClass))
#define CDISPLAY_IS_CONTRAST(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_CONTRAST))
#define CDISPLAY_IS_CONTRAST_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_CONTRAST))
typedef struct _CdisplayContrast CdisplayContrast;
typedef struct _CdisplayContrastClass CdisplayContrastClass;
struct _CdisplayContrast
{
GimpColorDisplay parent_instance;
gdouble contrast;
guchar *lookup;
GtkWidget *hbox;
GtkObject *adjustment;
};
struct _CdisplayContrastClass
{
GimpColorDisplayClass parent_instance;
};
static GType cdisplay_contrast_get_type (GTypeModule *module);
static void cdisplay_contrast_class_init (CdisplayContrastClass *klass);
static void cdisplay_contrast_init (CdisplayContrast *contrast);
static void cdisplay_contrast_finalize (GObject *object);
static GimpColorDisplay * cdisplay_contrast_clone (GimpColorDisplay *display);
static void cdisplay_contrast_convert (GimpColorDisplay *display,
guchar *buf,
gint w,
gint h,
gint bpp,
gint bpl);
static void cdisplay_contrast_load_state (GimpColorDisplay *display,
GimpParasite *state);
static GimpParasite * cdisplay_contrast_save_state (GimpColorDisplay *display);
static GtkWidget * cdisplay_contrast_configure (GimpColorDisplay *display);
static void cdisplay_contrast_configure_reset (GimpColorDisplay *display);
static void contrast_create_lookup_table (CdisplayContrast *contrast);
static void contrast_configure_adj_callback (GtkAdjustment *adj,
CdisplayContrast *contrast);
static const GimpModuleInfo cdisplay_contrast_info =
{
GIMP_MODULE_ABI_VERSION,
N_("High Contrast color display filter"),
"Jay Cox <jaycox@earthlink.net>",
"v0.2",
"(c) 2000, released under the GPL",
"October 14, 2000"
};
static GType cdisplay_contrast_type = 0;
static GimpColorDisplayClass *parent_class = NULL;
G_MODULE_EXPORT const GimpModuleInfo *
gimp_module_query (GTypeModule *module)
{
return &cdisplay_contrast_info;
}
G_MODULE_EXPORT gboolean
gimp_module_register (GTypeModule *module)
{
cdisplay_contrast_get_type (module);
return TRUE;
}
static GType
cdisplay_contrast_get_type (GTypeModule *module)
{
if (! cdisplay_contrast_type)
{
static const GTypeInfo display_info =
{
sizeof (CdisplayContrastClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) cdisplay_contrast_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (CdisplayContrast),
0, /* n_preallocs */
(GInstanceInitFunc) cdisplay_contrast_init,
};
cdisplay_contrast_type =
g_type_module_register_type (module,
GIMP_TYPE_COLOR_DISPLAY,
"CdisplayContrast",
&display_info, 0);
}
return cdisplay_contrast_type;
}
static void
cdisplay_contrast_class_init (CdisplayContrastClass *klass)
{
GObjectClass *object_class;
GimpColorDisplayClass *display_class;
object_class = G_OBJECT_CLASS (klass);
display_class = GIMP_COLOR_DISPLAY_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = cdisplay_contrast_finalize;
display_class->name = _("Contrast");
display_class->help_page = "modules/contrast.html";
display_class->clone = cdisplay_contrast_clone;
display_class->convert = cdisplay_contrast_convert;
display_class->load_state = cdisplay_contrast_load_state;
display_class->save_state = cdisplay_contrast_save_state;
display_class->configure = cdisplay_contrast_configure;
display_class->configure_reset = cdisplay_contrast_configure_reset;
}
static void
cdisplay_contrast_init (CdisplayContrast *contrast)
{
contrast->contrast = DEFAULT_CONTRAST;
contrast->lookup = g_new (guchar, 256);
contrast_create_lookup_table (contrast);
}
static void
cdisplay_contrast_finalize (GObject *object)
{
CdisplayContrast *contrast;
contrast = CDISPLAY_CONTRAST (object);
if (contrast->hbox)
gtk_widget_destroy (contrast->hbox);
if (contrast->lookup)
{
g_free (contrast->lookup);
contrast->lookup = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GimpColorDisplay *
cdisplay_contrast_clone (GimpColorDisplay *display)
{
CdisplayContrast *contrast;
CdisplayContrast *copy;
contrast = CDISPLAY_CONTRAST (display);
copy = CDISPLAY_CONTRAST (gimp_color_display_new (G_TYPE_FROM_INSTANCE (contrast)));
copy->contrast = contrast->contrast;
memcpy (copy->lookup, contrast->lookup, sizeof (guchar) * 256);
return GIMP_COLOR_DISPLAY (copy);
}
static void
cdisplay_contrast_convert (GimpColorDisplay *display,
guchar *buf,
gint width,
gint height,
gint bpp,
gint bpl)
{
CdisplayContrast *contrast;
gint i, j = height;
contrast = CDISPLAY_CONTRAST (display);
/* You will not be using the entire buffer most of the time.
* Hence, the simplistic code for this is as follows:
*
* for (j = 0; j < height; j++)
* {
* for (i = 0; i < width * bpp; i++)
* buf[i] = lookup[buf[i]];
* buf += bpl;
* }
*/
width *= bpp;
bpl -= width;
while (j--)
{
i = width;
while (i--)
{
*buf = contrast->lookup[*buf];
buf++;
}
buf += bpl;
}
}
static void
cdisplay_contrast_load_state (GimpColorDisplay *display,
GimpParasite *state)
{
CdisplayContrast *contrast;
contrast = CDISPLAY_CONTRAST (display);
#if G_BYTE_ORDER == G_BIG_ENDIAN
memcpy (&contrast->contrast, gimp_parasite_data (state), sizeof (gdouble));
#else
{
guint32 buf[2], *data = gimp_parasite_data (state);
buf[0] = g_ntohl (data[1]);
buf[1] = g_ntohl (data[0]);
memcpy (&contrast->contrast, buf, sizeof (gdouble));
}
#endif
contrast_create_lookup_table (contrast);
}
static GimpParasite *
cdisplay_contrast_save_state (GimpColorDisplay *display)
{
CdisplayContrast *contrast;
guint32 buf[2];
contrast = CDISPLAY_CONTRAST (display);
memcpy (buf, &contrast->contrast, sizeof (double));
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
{
guint32 tmp;
tmp = g_htonl (buf[0]);
buf[0] = g_htonl (buf[1]);
buf[1] = tmp;
}
#endif
return gimp_parasite_new ("Display/Contrast", GIMP_PARASITE_PERSISTENT,
sizeof (double), &buf);
}
static GtkWidget *
cdisplay_contrast_configure (GimpColorDisplay *display)
{
CdisplayContrast *contrast;
GtkWidget *label;
GtkWidget *spinbutton;
contrast = CDISPLAY_CONTRAST (display);
if (contrast->hbox)
gtk_widget_destroy (contrast->hbox);
contrast->hbox = gtk_hbox_new (FALSE, 2);
g_object_add_weak_pointer (G_OBJECT (contrast->hbox),
(gpointer) &contrast->hbox);
label = gtk_label_new ( _("Contrast Cycles:"));
gtk_box_pack_start (GTK_BOX (contrast->hbox), label, FALSE, FALSE, 0);
gtk_widget_show (label);
spinbutton = gimp_spin_button_new (&contrast->adjustment,
contrast->contrast,
0.01, 10.0, 0.01, 0.1, 0.0,
0.1, 3);
gtk_box_pack_start (GTK_BOX (contrast->hbox), spinbutton, FALSE, FALSE, 0);
gtk_widget_show (spinbutton);
g_signal_connect (contrast->adjustment, "value_changed",
G_CALLBACK (contrast_configure_adj_callback),
contrast);
return contrast->hbox;
}
static void
cdisplay_contrast_configure_reset (GimpColorDisplay *display)
{
CdisplayContrast *contrast;
contrast = CDISPLAY_CONTRAST (display);
if (contrast->adjustment)
gtk_adjustment_set_value (GTK_ADJUSTMENT (contrast->adjustment),
DEFAULT_CONTRAST);
}
static void
contrast_create_lookup_table (CdisplayContrast *contrast)
{
gint i;
if (contrast->contrast == 0.0)
contrast->contrast = 1.0;
for (i = 0; i < 256; i++)
{
contrast->lookup[i] = (guchar) (gint)
(255 * .5 * (1 + sin (contrast->contrast * 2 * G_PI * i / 255.0)));
}
}
static void
contrast_configure_adj_callback (GtkAdjustment *adj,
CdisplayContrast *contrast)
{
contrast->contrast = adj->value;
contrast_create_lookup_table (contrast);
gimp_color_display_changed (GIMP_COLOR_DISPLAY (contrast));
}
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