mirror of https://github.com/GNOME/gimp.git
474 lines
11 KiB
C
474 lines
11 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1999 Manish Singh
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <string.h>
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#include "gdisplay_color.h"
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#include "gdisplay.h"
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#include "gimpimageP.h"
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#include "libgimp/parasite.h"
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#include "libgimp/gimpintl.h"
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#include <gtk/gtk.h>
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typedef struct _ColorDisplayInfo ColorDisplayInfo;
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struct _ColorDisplayInfo {
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char *name;
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GimpColorDisplayMethods methods;
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GSList *refs;
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};
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static GHashTable *color_display_table = NULL;
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typedef struct _GammaContext GammaContext;
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struct _GammaContext
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{
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double gamma;
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guchar *lookup;
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GtkWidget *shell;
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GtkWidget *spinner;
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};
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static void color_display_foreach (gpointer key,
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gpointer value,
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gpointer user_data);
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static void gdisplay_color_detach_real (GDisplay *gdisp,
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ColorDisplayNode *node,
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gboolean unref);
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static gint node_name_compare (ColorDisplayNode *node,
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const char *name);
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static gpointer gamma_new (int type);
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static void gamma_create_lookup_table (GammaContext *context);
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static void gamma_destroy (gpointer cd_ID);
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static void gamma_convert (gpointer cd_ID,
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guchar *buf,
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int width,
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int height,
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int bpp);
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static void gamma_load (gpointer cd_ID,
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Parasite *state);
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static Parasite * gamma_save (gpointer cd_ID);
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static void gamma_configure_ok_callback (GtkWidget *widget,
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gpointer data);
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static void gamma_configure_cancel_callback (GtkWidget *widget,
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gpointer data);
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static gint gamma_configure_delete_callback (GtkWidget *widget,
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GdkEvent *event,
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gpointer data);
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static void gamma_configure (gpointer cd_ID);
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void
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gdisplay_color_init (void)
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{
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GimpColorDisplayMethods methods = {
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NULL,
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gamma_new,
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gamma_convert,
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gamma_destroy,
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NULL,
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gamma_load,
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gamma_save,
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gamma_configure
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};
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gimp_color_display_register ("Gamma", &methods);
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}
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gboolean
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gimp_color_display_register (const char *name,
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GimpColorDisplayMethods *methods)
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{
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ColorDisplayInfo *info;
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info = g_new (ColorDisplayInfo, 1);
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info->name = g_strdup (name);
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info->methods = *methods;
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info->refs = NULL;
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if (!color_display_table)
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color_display_table = g_hash_table_new (g_str_hash, g_str_equal);
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if (g_hash_table_lookup (color_display_table, name))
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return FALSE;
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if (!methods->convert)
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return FALSE;
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g_hash_table_insert (color_display_table, info->name, info);
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return TRUE;
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}
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gboolean
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gimp_color_display_unregister (const char *name)
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{
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ColorDisplayInfo *info;
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GDisplay *gdisp;
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GList *node;
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if ((info = g_hash_table_lookup (color_display_table, name)))
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{
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GSList *refs = info->refs;
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while (refs)
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{
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gdisp = (GDisplay *) refs->data;
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node = g_list_find_custom (gdisp->cd_list, name, node_name_compare);
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gdisp->cd_list = g_slist_remove_link (gdisp->cd_list, node);
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gdisplay_color_detach_real (gdisp, node->data, FALSE);
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g_list_free_1 (node);
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refs = refs->next;
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}
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g_slist_free (info->refs);
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g_hash_table_remove (color_display_table, name);
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g_free (info->name);
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g_free (info);
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}
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return TRUE;
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}
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typedef struct _DisplayForeachData DisplayForeachData;
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struct _DisplayForeachData
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{
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GimpCDFunc func;
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gpointer user_data;
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};
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void
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gimp_color_display_foreach (GimpCDFunc func,
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gpointer user_data)
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{
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DisplayForeachData data;
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data.func = func;
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data.user_data = user_data;
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g_hash_table_foreach (color_display_table, color_display_foreach, &data);
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}
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static void
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color_display_foreach (gpointer key,
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gpointer value,
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gpointer user_data)
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{
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DisplayForeachData *data = (DisplayForeachData *) user_data;
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data->func (key, data->user_data);
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}
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void
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gdisplay_color_attach (GDisplay *gdisp,
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const char *name)
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{
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ColorDisplayInfo *info;
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ColorDisplayNode *node;
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if ((info = g_hash_table_lookup (color_display_table, name)))
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{
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node = g_new (ColorDisplayNode, 1);
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node->cd_name = g_strdup (name);
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node->cd_ID = NULL;
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if (!info->refs && info->methods.init)
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info->methods.init ();
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info->refs = g_slist_append (info->refs, gdisp);
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if (info->methods.new)
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node->cd_ID = info->methods.new (gdisp->gimage->base_type);
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node->cd_convert = info->methods.convert;
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gdisp->cd_list = g_list_append (gdisp->cd_list, name);
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}
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else
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g_warning ("Tried to attach a nonexistant color display");
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}
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void
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gdisplay_color_detach (GDisplay *gdisp,
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const char *name)
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{
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GList *node;
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node = g_list_find_custom (gdisp->cd_list, name, node_name_compare);
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gdisplay_color_detach_real (gdisp, node->data, TRUE);
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gdisp->cd_list = g_list_remove_link (gdisp->cd_list, node);
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g_list_free_1 (node);
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}
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void
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gdisplay_color_detach_all (GDisplay *gdisp)
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{
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GList *list = gdisp->cd_list;
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while (list)
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{
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gdisplay_color_detach_real (gdisp, list->data, TRUE);
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list = list->next;
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}
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g_list_free (gdisp->cd_list);
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gdisp->cd_list = NULL;
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}
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static void
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gdisplay_color_detach_real (GDisplay *gdisp,
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ColorDisplayNode *node,
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gboolean unref)
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{
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ColorDisplayInfo *info;
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if ((info = g_hash_table_lookup (color_display_table, node->cd_name)))
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{
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if (info->methods.destroy)
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info->methods.destroy (node->cd_ID);
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if (unref)
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info->refs = g_slist_remove (info->refs, gdisp);
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if (!info->refs && info->methods.finalize)
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info->methods.finalize ();
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}
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g_free (node->cd_name);
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g_free (node);
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}
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static gint
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node_name_compare (ColorDisplayNode *node,
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const char *name)
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{
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return strcmp (node->cd_name, name);
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}
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/* The Gamma Color Display */
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static gpointer
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gamma_new (int type)
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{
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int i;
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GammaContext *context = NULL;
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context = g_new (GammaContext, 1);
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context->gamma = 1.0;
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context->lookup = g_new (guchar, 256);
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context->shell = NULL;
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context->spinner = NULL;
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for (i = 0; i < 256; i++)
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context->lookup[i] = i;
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return context;
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}
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static void
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gamma_create_lookup_table (GammaContext *context)
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{
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double one_over_gamma;
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double ind;
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int i;
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if (context->gamma == 0.0)
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context->gamma = 1.0;
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one_over_gamma = 1.0 / context->gamma;
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for (i = 0; i < 256; i++)
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{
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ind = (double) i / 255.0;
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context->lookup[i] = (guchar) (int) (255 * pow (ind, one_over_gamma));
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}
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}
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static void
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gamma_destroy (gpointer cd_ID)
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{
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GammaContext *context = (GammaContext *) cd_ID;
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if (context->shell)
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gtk_widget_destroy (context->shell);
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g_free (context->lookup);
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g_free (context);
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}
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static void
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gamma_convert (gpointer cd_ID,
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guchar *buf,
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int width,
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int height,
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int bpp)
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{
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int i;
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guchar *lookup = ((GammaContext *) cd_ID)->lookup;
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for (i = 0; i < width * height * bpp; i++)
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*buf++ = lookup[*buf];
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}
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static void
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gamma_load (gpointer cd_ID,
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Parasite *state)
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{
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GammaContext *context = (GammaContext *) cd_ID;
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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memcpy (&context->gamma, parasite_data (state), sizeof (double));
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#else
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guint32 buf[2], *data = parasite_data (state);
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buf[0] = g_ntohl (data[1]);
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buf[1] = g_ntohl (data[0]);
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memcpy (&context->gamma, buf, sizeof (double));
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#endif
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gamma_create_lookup_table (context);
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}
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static Parasite *
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gamma_save (gpointer cd_ID)
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{
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GammaContext *context = (GammaContext *) cd_ID;
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guint32 buf[2];
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memcpy (buf, &context->gamma, sizeof (double));
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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{
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guint32 tmp = g_htonl (buf[0]);
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buf[0] = g_htonl (buf[1]);
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buf[1] = tmp;
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}
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#endif
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return parasite_new ("Display/Gamma", PARASITE_PERSISTENT,
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sizeof (double), &buf);
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}
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static void
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gamma_configure_ok_callback (GtkWidget *widget,
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gpointer data)
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{
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GammaContext *context = (GammaContext *) data;
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context->gamma = gtk_spin_button_get_value_as_float (context->spinner);
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gamma_create_lookup_table (context);
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gtk_widget_hide (widget);
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}
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static void
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gamma_configure_cancel_callback (GtkWidget *widget,
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gpointer data)
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{
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gtk_widget_hide (widget);
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}
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static gint
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gamma_configure_delete_callback (GtkWidget *widget,
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GdkEvent *event,
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gpointer data)
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{
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gamma_configure_cancel_callback (widget, data);
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return TRUE;
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}
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static void
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gamma_configure (gpointer cd_ID)
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{
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GammaContext *context = (GammaContext *) cd_ID;
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GtkWidget *vbox;
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GtkWidget *hbox;
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GtkWidget *label;
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GtkWidget *entry;
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GtkWidget *hbbox;
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GtkWidget *button;
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GtkObject *adjustment;
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if (!context->shell)
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{
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context->shell = gtk_dialog_new ();
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gtk_window_set_wmclass (GTK_WINDOW (context->shell), "gamma", "Gimp");
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gtk_window_set_title (GTK_WINDOW (context->shell), _("Gamma"));
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gtk_signal_connect (GTK_OBJECT (context->shell), "delete_event",
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GTK_SIGNAL_FUNC (gamma_configure_delete_callback),
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NULL);
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hbox = gtk_hbox_new (TRUE, 2);
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gtk_box_pack_start (GTK_BOX (GTK_DIALOG (context->shell)->vbox),
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hbox, FALSE, FALSE, 0);
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label = gtk_label_new (_("Gamma:"));
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gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
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gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
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adjustment = gtk_adjustment_new (1.0, 0.01, 10.0, 0.01, 0.1, 0.0);
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context->spinner = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment),
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0.1, 3);
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gtk_widget_set_usize (context->spinner, 100, 0);
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gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, FALSE, 0);
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gtk_widget_show_all (hbox);
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hbbox = gtk_hbutton_box_new ();
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gtk_button_box_set_spacing (GTK_BUTTON_BOX (hbbox), 4);
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gtk_box_pack_end (GTK_BOX (GTK_DIALOG (context->shell)->action_area),
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hbbox, FALSE, FALSE, 0);
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button = gtk_button_new_with_label (_("OK"));
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GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
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gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (gamma_configure_ok_callback),
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cd_ID);
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button = gtk_button_new_with_label (_("Cancel"));
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GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
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gtk_box_pack_start (GTK_BOX (hbbox), button, FALSE, FALSE, 0);
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gtk_signal_connect (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (gamma_configure_cancel_callback),
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cd_ID);
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gtk_widget_show_all (hbbox);
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}
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gtk_widget_show (context->shell);
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}
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