1 files changed, 52 insertions, 0 deletions
diff --git a/palette.h b/palette.h
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+/* Palette-manipulation functions functions for xcftools
+ *
+ * Copyright (C) 2006  Henning Makholm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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
+ */
+
+#ifndef PALETTE_H
+#define PALETTE_H
+
+#include "xcftools.h"
+#include "pixels.h"
+
+#define MAX_PALETTE 256
+extern rgba palette[MAX_PALETTE] ;
+extern unsigned paletteSize ;
+
+typedef uint8_t index_t ;
+
+void init_palette_hash(void);
+
+/* lookup_or_intern() returns a negative number if there is no room
+ * for the color in the palette.
+ */
+int lookup_or_intern(rgba color);
+
+/* palettify_row will convert a row of 'rgba' values into a packed row
+ * of 'uint8_t' indces. If it succeeds without running out of colormap
+ * entries, it returns nonzero. On the other hand if it does run out
+ * of colormap entries it returns zero _and_ undoes the conversions
+ * already done, so that the row is still a full row of 'rgba' values
+ * afterwards.
+ */
+int palettify_row(rgba *row,unsigned ncols);
+
+/* palettify_rows is like palettify_rows, but works on several
+ * rows at a time.
+ */
+int palettify_rows(rgba *rows[],unsigned ncols,unsigned nlines);
+
+#endif /* PALETTE_H */