mirror of https://github.com/GNOME/gimp.git
176 lines
3.8 KiB
C
176 lines
3.8 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 "gdisplay_color.h"
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#include "gimpimageP.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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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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if ((info = g_hash_table_lookup (color_display_table, name)))
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{
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g_hash_table_remove (color_display_table, name);
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/* FIXME: Check refs here */
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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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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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gdisplay_color_detach (gdisp);
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gdisp->cd_name = g_strdup (name);
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gdisp->cd_ID = NULL;
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gdisp->cd_convert = NULL;
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if ((info = g_hash_table_lookup (color_display_table, name)))
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{
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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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gdisp->cd_ID = info->methods.new (gdisp->gimage->base_type);
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gdisp->cd_convert = info->methods.convert;
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}
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}
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void
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gdisplay_color_detach (GDisplay *gdisp)
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{
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ColorDisplayInfo *info;
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if (gdisp->cd_name)
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{
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if ((info = g_hash_table_lookup (color_display_table, gdisp->cd_name)))
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{
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if (info->methods.destroy)
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info->methods.destroy (gdisp->cd_ID);
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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 (gdisp->cd_name);
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gdisp->cd_name = NULL;
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}
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}
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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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};
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static
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gpointer 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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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
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void gamma_destroy (gpointer cd_ID)
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{
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GammaContext *context = (GammaContext *) cd_ID;
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g_free (context->lookup);
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g_free (context);
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}
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static
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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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{
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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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void
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gdisplay_color_init (void)
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{
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}
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