wrlib: Added clean-up of library internals in 'RShutdown'

The library uses internally a cache of tables to convert image to different
depths, there is now an internal function 'r_destroy_conversion_tables' to
free them.

wrlib/Makefile.am

@@ -28,6 +28,7 @@ libwraster_la_SOURCES = 	\
 	save.c		\
 	gradient.c 	\
 	xpixmap.c	\
+	convert.h 	\
 	convert.c 	\
 	context.c 	\
 	misc.c 		\

wrlib/convert.c

@@ -34,6 +34,8 @@
 #include <assert.h>
 
 #include "wraster.h"
+#include "convert.h"
+
 
 #ifdef USE_XSHM
 extern Pixmap R_CreateXImageMappedPixmap(RContext * context, RXImage * ximage);
@@ -62,6 +64,38 @@ typedef struct RStdConversionTable {
 static RConversionTable *conversionTable = NULL;
 static RStdConversionTable *stdConversionTable = NULL;
 
+static void release_conversion_table(void)
+{
+	RConversionTable *tmp = conversionTable;
+
+	while (tmp) {
+		RConversionTable *tmp_to_delete = tmp;
+
+		tmp = tmp->next;
+		free(tmp_to_delete);
+	}
+	conversionTable = NULL;
+}
+
+static void release_std_conversion_table(void)
+{
+	RStdConversionTable *tmp = stdConversionTable;
+
+	while (tmp) {
+		RStdConversionTable *tmp_to_delete = tmp;
+
+		tmp = tmp->next;
+		free(tmp_to_delete);
+	}
+	stdConversionTable = NULL;
+}
+
+void r_destroy_conversion_tables(void)
+{
+	release_conversion_table();
+	release_std_conversion_table();
+}
+
 static unsigned short *computeTable(unsigned short mask)
 {
 	RConversionTable *tmp = conversionTable;

wrlib/convert.h

@@ -0,0 +1,39 @@
+/*
+ * Raster graphics library
+ *
+ * Copyright (c) 2014 Window Maker Team
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ *  MA 02110-1301, USA.
+ */
+
+/*
+ * Functions to convert images to given color depths
+ *
+ * The functions here are for WRaster library's internal use only,
+ * Please use functions in 'wraster.h' in applications
+ */
+
+#ifndef WRASTER_CONVERT_H
+#define WRASTER_CONVERT_H
+
+
+/*
+ * Function for to release internal Conversion Tables
+ */
+void r_destroy_conversion_tables(void);
+
+
+#endif

wrlib/misc.c

@@ -27,6 +27,7 @@
 
 #include "wraster.h"
 #include "imgformat.h"
+#include "convert.h"
 
 
 void RBevelImage(RImage * image, int bevel_type)
@@ -252,4 +253,5 @@ void RShutdown(void)
 	RReleaseMagick();
 #endif
 	RReleaseCache();
+	r_destroy_conversion_tables();
 }