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gimp/modules/cdisplay_gamma.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 "app/dialog_handler.h"
#include "gimpmodregister.h"
#include <libgimp/gimpcolordisplay.h>
#include <libgimp/gimpmodule.h>
#include <libgimp/gimpparasite.h>
#include <libgimp/gimpmath.h>
#include <libgimp/gimpui.h>
#include "libgimp/gimpintl.h"
#define COLOR_DISPLAY_NAME _("Gamma")
typedef struct _GammaContext GammaContext;
struct _GammaContext
{
GFunc ok_func;
gpointer ok_data;
GFunc cancel_func;
gpointer cancel_data;
gdouble gamma;
guchar *lookup;
GtkWidget *shell;
GtkWidget *spinner;
};
static gpointer gamma_new (int type);
static gpointer gamma_clone (gpointer cd_ID);
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,
GimpParasite *state);
static GimpParasite * 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 void gamma_configure (gpointer cd_ID,
GFunc ok_func,
gpointer ok_data,
GFunc cancel_func,
gpointer cancel_data);
static void gamma_configure_cancel (gpointer cd_ID);
static GimpColorDisplayMethods methods =
{
NULL,
gamma_new,
gamma_clone,
gamma_convert,
gamma_destroy,
NULL,
gamma_load,
gamma_save,
gamma_configure,
gamma_configure_cancel
};
static GimpModuleInfo info =
{
NULL,
N_("Gamma color display filter"),
"Manish Singh <yosh@gimp.org>",
"v0.2",
"(c) 1999, released under the GPL",
"October 14, 2000"
};
G_MODULE_EXPORT GimpModuleStatus
module_init (GimpModuleInfo **inforet)
{
#ifndef __EMX__
if (gimp_color_display_register (COLOR_DISPLAY_NAME, &methods))
#else
if (mod_color_display_register (COLOR_DISPLAY_NAME, &methods))
#endif
{
*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)
{
#ifndef __EMX__
gimp_color_display_unregister (COLOR_DISPLAY_NAME);
#else
mod_color_display_unregister (COLOR_DISPLAY_NAME);
#endif
}
static gpointer
gamma_new (int type)
{
int i;
GammaContext *context;
context = g_new0 (GammaContext, 1);
context->gamma = 1.0;
context->lookup = g_new (guchar, 256);
for (i = 0; i < 256; i++)
context->lookup[i] = i;
return context;
}
static gpointer
gamma_clone (gpointer cd_ID)
{
GammaContext *src_context = cd_ID;
GammaContext *context;
context = gamma_new (0);
context->gamma = src_context->gamma;
memcpy (context->lookup, src_context->lookup, sizeof (guchar) * 256);
return context;
}
static void
gamma_create_lookup_table (GammaContext *context)
{
gdouble one_over_gamma;
gdouble ind;
gint 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) (gint) (255 * pow (ind, one_over_gamma));
}
}
static void
gamma_destroy (gpointer cd_ID)
{
GammaContext *context = cd_ID;
if (context->shell)
{
dialog_unregister (context->shell);
gtk_widget_destroy (context->shell);
}
g_free (context->lookup);
g_free (context);
}
static void
gamma_convert (gpointer cd_ID,
guchar *buf,
gint width,
gint height,
gint bpp,
gint bpl)
{
guchar *lookup = ((GammaContext *) cd_ID)->lookup;
gint 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,
GimpParasite *state)
{
GammaContext *context = cd_ID;
#if G_BYTE_ORDER == G_BIG_ENDIAN
memcpy (&context->gamma, 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 (&context->gamma, buf, sizeof (gdouble));
#endif
gamma_create_lookup_table (context);
}
static GimpParasite *
gamma_save (gpointer cd_ID)
{
GammaContext *context = 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 gimp_parasite_new ("Display/Gamma", GIMP_PARASITE_PERSISTENT,
sizeof (double), &buf);
}
static void
gamma_configure_ok_callback (GtkWidget *widget,
gpointer data)
{
GammaContext *context = data;
context->gamma =
gtk_spin_button_get_value_as_float (GTK_SPIN_BUTTON (context->spinner));
gamma_create_lookup_table (context);
dialog_unregister (context->shell);
gtk_widget_destroy (GTK_WIDGET (context->shell));
context->shell = NULL;
if (context->ok_func)
context->ok_func (context, context->ok_data);
}
static void
gamma_configure_cancel_callback (GtkWidget *widget,
gpointer data)
{
GammaContext *context = data;
dialog_unregister (context->shell);
gtk_widget_destroy (GTK_WIDGET (context->shell));
context->shell = NULL;
if (context->cancel_func)
context->cancel_func (context, context->cancel_data);
}
static void
gamma_configure (gpointer cd_ID,
GFunc ok_func,
gpointer ok_data,
GFunc cancel_func,
gpointer cancel_data)
{
GammaContext *context = cd_ID;
GtkWidget *hbox;
GtkWidget *label;
GtkObject *adjustment;
if (!context->shell)
{
context->ok_func = ok_func;
context->ok_data = ok_data;
context->cancel_func = cancel_func;
context->cancel_data = cancel_data;
context->shell =
gimp_dialog_new (_("Gamma"), "gamma",
gimp_standard_help_func, "modules/gamma.html",
GTK_WIN_POS_MOUSE,
FALSE, TRUE, FALSE,
GTK_STOCK_CANCEL, gamma_configure_cancel_callback,
cd_ID, NULL, NULL, FALSE, TRUE,
GTK_STOCK_OK, gamma_configure_ok_callback,
cd_ID, NULL, NULL, TRUE, FALSE,
NULL);
dialog_register (context->shell);
hbox = gtk_hbox_new (FALSE, 2);
gtk_container_set_border_width (GTK_CONTAINER (hbox), 6);
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, TRUE, 0);
adjustment = gtk_adjustment_new (context->gamma, 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), context->spinner, FALSE, FALSE, 0);
}
gtk_widget_show_all (context->shell);
}
static void
gamma_configure_cancel (gpointer cd_ID)
{
GammaContext *context = cd_ID;
if (context->shell)
{
dialog_unregister (context->shell);
gtk_widget_destroy (context->shell);
context->shell = NULL;
}
if (context->cancel_func)
context->cancel_func (context, context->cancel_data);
}
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