static unsigned char (*qpng_get_channels) (void*, void*);
static unsigned char (*qpng_get_bit_depth) (void*, void*);
static unsigned int (*qpng_get_IHDR) (void*, void*, unsigned long*, unsigned long*, int *, int *, int *, int *, int *);
static unsigned char (*qpng_get_channels) (void*, void*);
static unsigned char (*qpng_get_bit_depth) (void*, void*);
static unsigned int (*qpng_get_IHDR) (void*, void*, unsigned long*, unsigned long*, int *, int *, int *, int *, int *);