--- a/tools/libgfx.h	Tue Aug 22 16:54:41 2017 +0300
+++ b/tools/libgfx.h	Tue Aug 22 17:15:22 2017 +0300
@@ -79,8 +79,8 @@
     int  (*probe)(const Uint8 *buf, const size_t len);
     int  (*read)(const char *filename, DMImage **pimg);
     int  (*readFILE)(FILE *fp, DMImage **pimg);
-    int  (*write)(const char *filename, DMImage *pimg, const DMImageConvSpec *spec);
-    int  (*writeFILE)(FILE *fp, DMImage *pimg, const DMImageConvSpec *spec);
+    int  (*write)(const char *filename, const DMImage *pimg, const DMImageConvSpec *spec);
+    int  (*writeFILE)(FILE *fp, const DMImage *pimg, const DMImageConvSpec *spec);
 } DMImageFormat;
 
 
@@ -104,22 +104,25 @@
 BOOL dmCompareColor(const DMColor *c1, const DMColor *c2, BOOL alpha);
 
 
-int dmWriteImageData(DMImage *img, void *cbdata, int (*writeRowCB)(void *, const Uint8 *, const size_t), const DMImageConvSpec *spec);
+int dmWriteImageData(const DMImage *img, void *cbdata, int (*writeRowCB)(void *, const Uint8 *, const size_t), const DMImageConvSpec *spec);
 
-int dmWriteIFFMasterRAWPalette(FILE *fp, DMImage *img, int ncolors, const char *indent, const char *type);
-int dmWriteRAWImageFILE(FILE *fp, DMImage *img, const DMImageConvSpec *spec);
-int dmWriteRAWImage(const char *filename, DMImage *img, const DMImageConvSpec *spec);
+int dmWriteIFFMasterRAWPalette(FILE *fp, const DMImage *img, int ncolors, const char *indent, const char *type);
+int dmWriteRAWImageFILE(FILE *fp, const DMImage *img, const DMImageConvSpec *spec);
+int dmWriteRAWImage(const char *filename, const DMImage *img, const DMImageConvSpec *spec);
 
-int dmWritePPMImageFILE(FILE *fp, DMImage *img, const DMImageConvSpec *spec);
-int dmWritePPMImage(const char *filename, DMImage *img, const DMImageConvSpec *spec);
+int dmWritePPMImageFILE(FILE *fp, const DMImage *img, const DMImageConvSpec *spec);
+int dmWritePPMImage(const char *filename, const DMImage *img, const DMImageConvSpec *spec);
 
 #ifdef DM_USE_LIBPNG
-int dmWritePNGImageFILE(FILE *fp, DMImage *img, const DMImageConvSpec *spec);
-int dmWritePNGImage(const char *filename, DMImage *img, const DMImageConvSpec *spec);
+int dmWritePNGImageFILE(FILE *fp, const DMImage *img, const DMImageConvSpec *spec);
+int dmWritePNGImage(const char *filename, const DMImage *img, const DMImageConvSpec *spec);
 #endif
 
-int dmWritePCXImageFILE(FILE *fp, DMImage *img, const DMImageConvSpec *spec);
-int dmWritePCXImage(const char *filename, DMImage *img, const DMImageConvSpec *spec);
+int dmReadILBMImageFILE(FILE *fp, DMImage **pimg);
+int dmReadILBMImage(const char *filename, DMImage **pimg);
+
+int dmWritePCXImageFILE(FILE *fp, const DMImage *img, const DMImageConvSpec *spec);
+int dmWritePCXImage(const char *filename, const DMImage *img, const DMImageConvSpec *spec);
 int dmReadPCXImageFILE(FILE *fp, DMImage **pimg);
 int dmReadPCXImage(const char *filename, DMImage **pimg);