colorspace
#define FOURCC(a,b,c,d)
void (*xfm_func_t) (unsigned char *dest_buffer, unsigned char *src_buffer, int width, int height, int shift);
unsigned char *dest_buffer
unsigned char *src_buffer
int width
int height
int shift
#define XFM_IN_PLACE 0x1
#define XFM_PASSTHROUGH 0x2
#define XFM_NO_CONVERSION 0x4