dos33fsprogs/utils/gr-utils/loadpng.h

#define PNG_WHOLETHING	0
#define PNG_ODDLINES	1
#define PNG_EVENLINES	2
#define PNG_RAW		3

int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
	int png_type);
int loadpng80(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
	int png_type);