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gimp/modules/cdisplay_gamma.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1999 Manish Singh
*
* 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 <math.h>
#include <string.h>
#include <libgimp/color_display.h>
#include <libgimp/gimpmodule.h>
#include <libgimp/parasite.h>
#include <gtk/gtk.h>
#define COLOR_DISPLAY_NAME "Gamma"
typedef struct _GammaContext GammaContext;
struct _GammaContext
{
double gamma;
guchar *lookup;
GtkWidget *shell;
GtkWidget *spinner;
};
static gpointer gamma_new (int type);
static void gamma_create_lookup_table (GammaContext *context);
static void gamma_destroy (gpointer cd_ID);
static void gamma_convert (gpointer cd_ID,
guchar *buf,
int w,
int h,
int bpp,
int bpl);
static void gamma_load (gpointer cd_ID,
Parasite *state);
static Parasite * gamma_save (gpointer cd_ID);
static void gamma_configure_ok_callback (GtkWidget *widget,
gpointer data);
static void gamma_configure_cancel_callback (GtkWidget *widget,
gpointer data);
static gint gamma_configure_delete_callback (GtkWidget *widget,
GdkEvent *event,
gpointer data);
static void gamma_configure (gpointer cd_ID);
static GimpColorDisplayMethods methods = {
NULL,
gamma_new,
gamma_convert,
gamma_destroy,
NULL,
gamma_load,
gamma_save,
gamma_configure
};
static GimpModuleInfo info = {
NULL,
"Gamma color display filter",
"Manish Singh <yosh@gimp.org>",
"v0.1",
"(c) 1999, released under the GPL",
"October 3, 1999"
};
G_MODULE_EXPORT GimpModuleStatus
module_init (GimpModuleInfo **inforet)
{
if (gimp_color_display_register (COLOR_DISPLAY_NAME, &methods))
{
*inforet = &info;
return GIMP_MODULE_OK;
}
else
return GIMP_MODULE_UNLOAD;
}
G_MODULE_EXPORT void
module_unload (void *shutdown_data,
void (*completed_cb)(void *),
void *completed_data)
{
gimp_color_display_unregister (COLOR_DISPLAY_NAME);
}
static gpointer
gamma_new (int type)
{
int i;
GammaContext *context = NULL;
context = g_new (GammaContext, 1);
context->gamma = 1.0;
context->lookup = g_new (guchar, 256);
context->shell = NULL;
context->spinner = NULL;
for (i = 0; i < 256; i++)
context->lookup[i] = i;
return context;
}
static void
gamma_create_lookup_table (GammaContext *context)
{
double one_over_gamma;
double ind;
int i;
if (context->gamma == 0.0)
context->gamma = 1.0;
one_over_gamma = 1.0 / context->gamma;
for (i = 0; i < 256; i++)
{
ind = (double) i / 255.0;
context->lookup[i] = (guchar) (int) (255 * pow (ind, one_over_gamma));
}
}
static void
gamma_destroy (gpointer cd_ID)
{
GammaContext *context = (GammaContext *) cd_ID;
if (context->shell)
gtk_widget_destroy (context->shell);
g_free (context->lookup);
g_free (context);
}
static void
gamma_convert (gpointer cd_ID,
guchar *buf,
int width,
int height,
int bpp,
int bpl)
{
guchar *lookup = ((GammaContext *) cd_ID)->lookup;
int i, j = height;
/* 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 = lookup[*buf];
buf++;
}
buf += bpl;
}
}
static void
gamma_load (gpointer cd_ID,
Parasite *state)
{
GammaContext *context = (GammaContext *) cd_ID;
#if G_BYTE_ORDER == G_BIG_ENDIAN
memcpy (&context->gamma, parasite_data (state), sizeof (double));
#else
guint32 buf[2], *data = parasite_data (state);
buf[0] = g_ntohl (data[1]);
buf[1] = g_ntohl (data[0]);
memcpy (&context->gamma, buf, sizeof (double));
#endif
gamma_create_lookup_table (context);
}
static Parasite *
gamma_save (gpointer cd_ID)
{
GammaContext *context = (GammaContext *) cd_ID;
guint32 buf[2];
memcpy (buf, &context->gamma, sizeof (double));
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
{
guint32 tmp = g_htonl (buf[0]);
buf[0] = g_htonl (buf[1]);
buf[1] = tmp;
}
#endif
return parasite_new ("Display/Gamma", PARASITE_PERSISTENT,
sizeof (double), &buf);
}
static void
gamma_configure_ok_callback (GtkWidget *widget,
gpointer data)
{
GammaContext *context = (GammaContext *) data;
context->gamma = gtk_spin_button_get_value_as_float (GTK_SPIN_BUTTON (context->spinner));
gamma_create_lookup_table (context);
gtk_widget_hide (widget);
}
static void
gamma_configure_cancel_callback (GtkWidget *widget,
gpointer data)
{
gtk_widget_hide (widget);
}
static gint
gamma_configure_delete_callback (GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
gamma_configure_cancel_callback (widget, data);
return TRUE;
}
static void
gamma_configure (gpointer cd_ID)
{
GammaContext *context = (GammaContext *) cd_ID;
GtkWidget *hbox;
GtkWidget *label;
GtkWidget *hbbox;
GtkWidget *button;
GtkObject *adjustment;
if (!context->shell)
{
context->shell = gtk_dialog_new ();
gtk_window_set_wmclass (GTK_WINDOW (context->shell), "gamma", "Gimp");
gtk_window_set_title (GTK_WINDOW (context->shell), "Gamma");
gtk_signal_connect (GTK_OBJECT (context->shell), "delete_event",
GTK_SIGNAL_FUNC (gamma_configure_delete_callback),
NULL);
hbox = gtk_hbox_new (TRUE, 2);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (context->shell)->vbox),
hbox, FALSE, FALSE, 0);
label = gtk_label_new ("Gamma:");
gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
adjustment = gtk_adjustment_new (1.0, 0.01, 10.0, 0.01, 0.1, 0.0);
context->spinner = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment),
0.1, 3);
gtk_widget_set_usize (context->spinner, 100, 0);
gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
hbbox = gtk_hbutton_box_new ();
gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
gtk_box_pack_end (GTK_BOX (GTK_DIALOG (context->shell)->action_area),
hbbox, FALSE, FALSE, 0);
button = gtk_button_new_with_label ("OK");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
GTK_SIGNAL_FUNC (gamma_configure_ok_callback),
cd_ID);
button = gtk_button_new_with_label ("Cancel");
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
gtk_signal_connect (GTK_OBJECT (button), "clicked",
GTK_SIGNAL_FUNC (gamma_configure_cancel_callback),
cd_ID);
gtk_widget_show_all (hbox);
}
gtk_widget_show (context->shell);
}
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