/* GIMP - The GNU 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 #include "libgimpconfig/gimpconfig.h" #include "libgimpmath/gimpmath.h" #include "libgimpmodule/gimpmodule.h" #include "libgimpwidgets/gimpwidgets.h" #include "libgimp/libgimp-intl.h" #define DEFAULT_GAMMA 1.0 #define CDISPLAY_TYPE_GAMMA (cdisplay_gamma_type) #define CDISPLAY_GAMMA(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_GAMMA, CdisplayGamma)) #define CDISPLAY_GAMMA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_GAMMA, CdisplayGammaClass)) #define CDISPLAY_IS_GAMMA(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_GAMMA)) #define CDISPLAY_IS_GAMMA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_GAMMA)) typedef struct _CdisplayGamma CdisplayGamma; typedef struct _CdisplayGammaClass CdisplayGammaClass; struct _CdisplayGamma { GimpColorDisplay parent_instance; gdouble gamma; guchar lookup[256]; }; struct _CdisplayGammaClass { GimpColorDisplayClass parent_instance; }; enum { PROP_0, PROP_GAMMA }; static GType cdisplay_gamma_get_type (GTypeModule *module); static void cdisplay_gamma_class_init (CdisplayGammaClass *klass); static void cdisplay_gamma_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec); static void cdisplay_gamma_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec); static void cdisplay_gamma_convert (GimpColorDisplay *display, guchar *buf, gint w, gint h, gint bpp, gint bpl); static GtkWidget * cdisplay_gamma_configure (GimpColorDisplay *display); static void cdisplay_gamma_set_gamma (CdisplayGamma *gamma, gdouble value); static const GimpModuleInfo cdisplay_gamma_info = { GIMP_MODULE_ABI_VERSION, N_("Gamma color display filter"), "Manish Singh ", "v0.2", "(c) 1999, released under the GPL", "October 14, 2000" }; static GType cdisplay_gamma_type = 0; static GimpColorDisplayClass *parent_class = NULL; G_MODULE_EXPORT const GimpModuleInfo * gimp_module_query (GTypeModule *module) { return &cdisplay_gamma_info; } G_MODULE_EXPORT gboolean gimp_module_register (GTypeModule *module) { cdisplay_gamma_get_type (module); return TRUE; } static GType cdisplay_gamma_get_type (GTypeModule *module) { if (! cdisplay_gamma_type) { const GTypeInfo display_info = { sizeof (CdisplayGammaClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) cdisplay_gamma_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (CdisplayGamma), 0, /* n_preallocs */ NULL /* instance_init */ }; cdisplay_gamma_type = g_type_module_register_type (module, GIMP_TYPE_COLOR_DISPLAY, "CdisplayGamma", &display_info, 0); } return cdisplay_gamma_type; } static void cdisplay_gamma_class_init (CdisplayGammaClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); GimpColorDisplayClass *display_class = GIMP_COLOR_DISPLAY_CLASS (klass); parent_class = g_type_class_peek_parent (klass); object_class->get_property = cdisplay_gamma_get_property; object_class->set_property = cdisplay_gamma_set_property; GIMP_CONFIG_INSTALL_PROP_DOUBLE (object_class, PROP_GAMMA, "gamma", NULL, 0.01, 10.0, DEFAULT_GAMMA, 0); display_class->name = _("Gamma"); display_class->help_id = "gimp-colordisplay-gamma"; display_class->stock_id = GIMP_STOCK_DISPLAY_FILTER_GAMMA; display_class->convert = cdisplay_gamma_convert; display_class->configure = cdisplay_gamma_configure; } static void cdisplay_gamma_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec) { CdisplayGamma *gamma = CDISPLAY_GAMMA (object); switch (property_id) { case PROP_GAMMA: g_value_set_double (value, gamma->gamma); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } static void cdisplay_gamma_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) { CdisplayGamma *gamma = CDISPLAY_GAMMA (object); switch (property_id) { case PROP_GAMMA: cdisplay_gamma_set_gamma (gamma, g_value_get_double (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); break; } } static void cdisplay_gamma_convert (GimpColorDisplay *display, guchar *buf, gint width, gint height, gint bpp, gint bpl) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); 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 = gamma->lookup[*buf]; buf++; } buf += bpl; } } static GtkWidget * cdisplay_gamma_configure (GimpColorDisplay *display) { CdisplayGamma *gamma = CDISPLAY_GAMMA (display); GtkWidget *hbox; GtkWidget *label; GtkWidget *spinbutton; hbox = gtk_hbox_new (FALSE, 6); label = gtk_label_new_with_mnemonic (_("_Gamma:")); gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0); gtk_widget_show (label); spinbutton = gimp_prop_spin_button_new (G_OBJECT (gamma), "gamma", 0.1, 1.0, 3); gtk_box_pack_start (GTK_BOX (hbox), spinbutton, FALSE, FALSE, 0); gtk_widget_show (spinbutton); gtk_label_set_mnemonic_widget (GTK_LABEL (label), spinbutton); return hbox; } static void cdisplay_gamma_set_gamma (CdisplayGamma *gamma, gdouble value) { if (value <= 0.0) value = 1.0; if (value != gamma->gamma) { gdouble one_over_gamma = 1.0 / value; gint i; gamma->gamma = value; for (i = 0; i < 256; i++) { gdouble ind = (gdouble) i / 255.0; gamma->lookup[i] = (guchar) (gint) (255 * pow (ind, one_over_gamma)); } g_object_notify (G_OBJECT (gamma), "gamma"); gimp_color_display_changed (GIMP_COLOR_DISPLAY (gamma)); } }