#ifndef JPEG_H_
#define JPEG_H_

#define ROUND_UP(val, round) ((val+(round)-1)/(round)*(round))

#define BLOCK_WIDTH 8
#define BLOCK_HEIGHT 8
#define BLOCK_SIZE (BLOCK_WIDTH*BLOCK_HEIGHT)

#define MAX_WIDTH ROUND_UP(WIDTH, BLOCK_WIDTH)
#define MAX_HEIGHT ROUND_UP(HEIGHT, BLOCK_HEIGHT)

#define BLOCKS_W (MAX_WIDTH/BLOCK_WIDTH)
#define BLOCKS_H (MAX_HEIGHT/BLOCK_HEIGHT)

#define NBLOCKS (BLOCKS_H*BLOCKS_W)

/*
 * JPEG format parsing markers
 */
#define SOI_MK	0xFFD8		/* start of image	*/
#define APP_MK	0xFFE0		/* custom, up to FFEF */
#define COM_MK	0xFFFE		/* commment segment	*/
#define SOF_MK	0xFFC0		/* start of frame	*/
#define SOS_MK	0xFFDA		/* start of scan	*/
#define DHT_MK	0xFFC4		/* Huffman table	*/
#define DQT_MK	0xFFDB		/* Quant. table		*/
#define DRI_MK	0xFFDD		/* restart interval	*/
#define EOI_MK	0xFFD9		/* end of image		*/
#define MK_MSK	0xFFF0
/* is x a restart interval ? */
#define RST_MK(x)	( (0xFFF8&(x)) == 0xFFD0 )

/*
 * all kinds of macros
 */
#define first_quad(c)   ((c)>>4)
#define second_quad(c)  ((c)&15)
#define HUFF_ID(class, id)  (2*(class)+(id))
#define DC_CLASS        0
#define AC_CLASS        1

#ifndef EOF
#define EOF -1
#endif

#define DATA_MAGIC 0xda1a0000

#endif /* JPEG_H_ */