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gimp/app/core/gimppalette.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib-object.h>
#include "libgimpcolor/gimpcolor.h"
#include "core-types.h"
#include "base/temp-buf.h"
#include "gimppalette.h"
#include "libgimp/gimpintl.h"
/* local function prototypes */
static void gimp_palette_class_init (GimpPaletteClass *klass);
static void gimp_palette_init (GimpPalette *palette);
static void gimp_palette_finalize (GObject *object);
static TempBuf * gimp_palette_get_new_preview (GimpViewable *viewable,
gint width,
gint height);
static void gimp_palette_dirty (GimpData *data);
static gboolean gimp_palette_save (GimpData *data);
static gchar * gimp_palette_get_extension (GimpData *data);
static void gimp_palette_entry_free (GimpPaletteEntry *entry);
/* private variables */
static GimpDataClass *parent_class = NULL;
GType
gimp_palette_get_type (void)
{
static GType palette_type = 0;
if (! palette_type)
{
static const GTypeInfo palette_info =
{
sizeof (GimpPaletteClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_palette_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpPalette),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_palette_init,
};
palette_type = g_type_register_static (GIMP_TYPE_DATA,
"GimpPalette",
&palette_info, 0);
}
return palette_type;
}
static void
gimp_palette_class_init (GimpPaletteClass *klass)
{
GObjectClass *object_class;
GimpViewableClass *viewable_class;
GimpDataClass *data_class;
object_class = G_OBJECT_CLASS (klass);
viewable_class = GIMP_VIEWABLE_CLASS (klass);
data_class = GIMP_DATA_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_palette_finalize;
viewable_class->get_new_preview = gimp_palette_get_new_preview;
data_class->dirty = gimp_palette_dirty;
data_class->save = gimp_palette_save;
data_class->get_extension = gimp_palette_get_extension;
}
static void
gimp_palette_init (GimpPalette *palette)
{
palette->colors = NULL;
palette->n_colors = 0;
palette->n_columns = 0;
}
static void
gimp_palette_finalize (GObject *object)
{
GimpPalette *palette;
g_return_if_fail (GIMP_IS_PALETTE (object));
palette = GIMP_PALETTE (object);
if (palette->colors)
{
g_list_foreach (palette->colors, (GFunc) gimp_palette_entry_free, NULL);
g_list_free (palette->colors);
palette->colors = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static TempBuf *
gimp_palette_get_new_preview (GimpViewable *viewable,
gint width,
gint height)
{
GimpPalette *palette;
GimpPaletteEntry *entry;
TempBuf *temp_buf;
guchar *buf;
guchar *b;
GList *list;
guchar white[3] = { 255, 255, 255 };
gint columns;
gint rows;
gint x, y, i;
palette = GIMP_PALETTE (viewable);
temp_buf = temp_buf_new (width, height,
3,
0, 0,
white);
#define CELL_SIZE 4
columns = width / CELL_SIZE;
rows = height / CELL_SIZE;
buf = temp_buf_data (temp_buf);
b = g_new (guchar, width * 3);
memset (b, 255, width * 3);
list = palette->colors;
for (y = 0; y < rows && list; y++)
{
for (x = 0; x < columns && list; x++)
{
entry = (GimpPaletteEntry *) list->data;
list = g_list_next (list);
gimp_rgb_get_uchar (&entry->color,
&b[x * CELL_SIZE * 3 + 0],
&b[x * CELL_SIZE * 3 + 1],
&b[x * CELL_SIZE * 3 + 2]);
for (i = 1; i < CELL_SIZE; i++)
{
b[(x * CELL_SIZE + i) * 3 + 0] = b[(x * CELL_SIZE) * 3 + 0];
b[(x * CELL_SIZE + i) * 3 + 1] = b[(x * CELL_SIZE) * 3 + 1];
b[(x * CELL_SIZE + i) * 3 + 2] = b[(x * CELL_SIZE) * 3 + 2];
}
}
for (i = 0; i < CELL_SIZE; i++)
{
memcpy (buf + ((y * CELL_SIZE + i) * width) * 3, b, width * 3);
}
}
#undef CELL_SIZE
g_free (b);
return temp_buf;
}
GimpData *
gimp_palette_new (const gchar *name)
{
GimpPalette *palette = NULL;
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail (*name != '\0', NULL);
palette = GIMP_PALETTE (g_object_new (GIMP_TYPE_PALETTE,
"name", name,
NULL));
gimp_data_dirty (GIMP_DATA (palette));
return GIMP_DATA (palette);
}
GimpData *
gimp_palette_get_standard (void)
{
static GimpPalette *standard_palette = NULL;
if (! standard_palette)
{
standard_palette = GIMP_PALETTE (g_object_new (GIMP_TYPE_PALETTE, NULL));
gimp_object_set_name (GIMP_OBJECT (standard_palette), "Standard");
}
return GIMP_DATA (standard_palette);
}
GimpData *
gimp_palette_load (const gchar *filename)
{
GimpPalette *palette;
gchar str[1024];
gchar *tok;
FILE *fp;
gint r, g, b;
GimpRGB color;
gint linenum;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (*filename != '\0', NULL);
r = g = b = 0;
/* Open the requested file */
if (! (fp = fopen (filename, "r")))
{
g_warning ("Failed to open palette file %s", filename);
return NULL;
}
linenum = 0;
fread (str, 13, 1, fp);
str[13] = '\0';
linenum++;
if (strcmp (str, "GIMP Palette\n"))
{
/* bad magic, but maybe it has \r\n at the end of lines? */
if (!strcmp (str, "GIMP Palette\r"))
g_message (_("Loading palette %s:\n"
"Corrupt palette:\n"
"missing magic header\n"
"Does this file need converting from DOS?"), filename);
else
g_message (_("Loading palette %s:\n"
"Corrupt palette: missing magic header"), filename);
fclose (fp);
return NULL;
}
palette = g_object_new (GIMP_TYPE_PALETTE, NULL);
gimp_data_set_filename (GIMP_DATA (palette), filename);
if (! fgets (str, 1024, fp))
{
g_message (_("Loading palette %s (line %d):\nRead error"),
filename, linenum);
fclose (fp);
g_object_unref (G_OBJECT (palette));
return NULL;
}
linenum++;
if (! strncmp (str, "Name: ", strlen ("Name: ")))
{
if (g_utf8_validate (str, -1, NULL))
{
gimp_object_set_name (GIMP_OBJECT (palette),
g_strstrip (&str[strlen ("Name: ")]));
}
else
{
g_message (_("Invalid UTF-8 string in palette file '%s'"), filename);
gimp_object_set_name (GIMP_OBJECT (palette), _("Unnamed"));
}
if (! fgets (str, 1024, fp))
{
g_message (_("Loading palette %s (line %d):\nRead error"),
filename, linenum);
fclose (fp);
g_object_unref (G_OBJECT (palette));
return NULL;
}
linenum++;
if (! strncmp (str, "Columns: ", strlen ("Columns: ")))
{
gint columns;
columns = atoi (g_strstrip (&str[strlen ("Columns: ")]));
if (columns < 0 || columns > 256)
{
g_message (_("Loading palette %s (line %d):\n"
"Invalid number or columns"),
filename, linenum);
columns = 0;
}
palette->n_columns = columns;
if (! fgets (str, 1024, fp))
{
g_message (_("Loading palette %s (line %d):\nRead error"),
filename, linenum);
fclose (fp);
g_object_unref (G_OBJECT (palette));
return NULL;
}
linenum++;
}
}
else /* old palette format */
{
gchar *basename;
g_warning ("old palette format %s", filename);
basename = g_path_get_basename (filename);
gimp_object_set_name (GIMP_OBJECT (palette), basename);
g_free (basename);
}
while (! feof (fp))
{
if (str[0] != '#')
{
tok = strtok (str, " \t");
if (tok)
r = atoi (tok);
else
/* maybe we should just abort? */
g_message (_("Loading palette %s (line %d):\n"
"Missing RED component"), filename, linenum);
tok = strtok (NULL, " \t");
if (tok)
g = atoi (tok);
else
g_message (_("Loading palette %s (line %d):\n"
"Missing GREEN component"), filename, linenum);
tok = strtok (NULL, " \t");
if (tok)
b = atoi (tok);
else
g_message (_("Loading palette %s (line %d):\n"
"Missing BLUE component"), filename, linenum);
/* optional name */
tok = strtok (NULL, "\n");
if (r < 0 || r > 255 ||
g < 0 || g > 255 ||
b < 0 || b > 255)
g_message (_("Loading palette %s (line %d):\n"
"RGB value out of range"), filename, linenum);
gimp_rgba_set_uchar (&color,
(guchar) r,
(guchar) g,
(guchar) b,
255);
gimp_palette_add_entry (palette, tok, &color);
}
if (! fgets (str, 1024, fp))
{
if (feof (fp))
break;
g_message (_("Loading palette %s (line %d):\nRead error"),
filename, linenum);
fclose (fp);
g_object_unref (G_OBJECT (palette));
return NULL;
}
linenum++;
}
fclose (fp);
GIMP_DATA (palette)->dirty = FALSE;
return GIMP_DATA (palette);
}
static void
gimp_palette_dirty (GimpData *data)
{
if (GIMP_DATA_CLASS (parent_class)->dirty)
GIMP_DATA_CLASS (parent_class)->dirty (data);
}
static gboolean
gimp_palette_save (GimpData *data)
{
GimpPalette *palette;
GimpPaletteEntry *entry;
GList *list;
FILE *fp;
guchar r, g, b;
palette = GIMP_PALETTE (data);
if (! (fp = fopen (GIMP_DATA (palette)->filename, "w")))
{
g_message (_("Can't save palette \"%s\"\n"),
GIMP_DATA (palette)->filename);
return FALSE;
}
fprintf (fp, "GIMP Palette\n");
fprintf (fp, "Name: %s\n", GIMP_OBJECT (palette)->name);
fprintf (fp, "Columns: %d\n#\n", CLAMP (palette->n_columns, 0, 256));
for (list = palette->colors; list; list = g_list_next (list))
{
entry = (GimpPaletteEntry *) list->data;
gimp_rgb_get_uchar (&entry->color, &r, &g, &b);
fprintf (fp, "%3d %3d %3d\t%s\n",
r, g, b,
entry->name);
}
fclose (fp);
if (GIMP_DATA_CLASS (parent_class)->save)
return GIMP_DATA_CLASS (parent_class)->save (data);
return TRUE;
}
static gchar *
gimp_palette_get_extension (GimpData *data)
{
return GIMP_PALETTE_FILE_EXTENSION;
}
GimpPaletteEntry *
gimp_palette_add_entry (GimpPalette *palette,
const gchar *name,
GimpRGB *color)
{
GimpPaletteEntry *entry;
g_return_val_if_fail (GIMP_IS_PALETTE (palette), NULL);
g_return_val_if_fail (color != NULL, NULL);
entry = g_new0 (GimpPaletteEntry, 1);
entry->color = *color;
entry->name = g_strdup (name ? name : _("Untitled"));
entry->position = palette->n_colors;
palette->colors = g_list_append (palette->colors, entry);
palette->n_colors += 1;
gimp_data_dirty (GIMP_DATA (palette));
return entry;
}
void
gimp_palette_delete_entry (GimpPalette *palette,
GimpPaletteEntry *entry)
{
GList *list;
gint pos = 0;
g_return_if_fail (GIMP_IS_PALETTE (palette));
g_return_if_fail (entry != NULL);
if (g_list_find (palette->colors, entry))
{
pos = entry->position;
gimp_palette_entry_free (entry);
palette->colors = g_list_remove (palette->colors, entry);
palette->n_colors--;
for (list = g_list_nth (palette->colors, pos);
list;
list = g_list_next (list))
{
entry = (GimpPaletteEntry *) list->data;
entry->position = pos++;
}
if (palette->n_colors == 0)
{
GimpRGB color;
gimp_rgba_set (&color, 0.0, 0.0, 0.0, 1.0);
gimp_palette_add_entry (palette,
_("Black"),
&color);
}
gimp_data_dirty (GIMP_DATA (palette));
}
}
static void
gimp_palette_entry_free (GimpPaletteEntry *entry)
{
g_return_if_fail (entry != NULL);
g_free (entry->name);
g_free (entry);
}
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