mirror of
https://github.com/opencv/opencv.git
synced 2024-12-15 18:09:11 +08:00
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
|
#ifndef TREES_H_
|
||
|
|
#define TREES_H_
|
||
|
|
|
||
|
|
/* Constants */
|
||
|
|
|
||
|
|
#define DIST_CODE_LEN 512
|
||
|
|
/* see definition of array dist_code in trees.c */
|
||
|
|
|
||
|
|
#define MAX_BL_BITS 7
|
||
|
|
/* Bit length codes must not exceed MAX_BL_BITS bits */
|
||
|
|
|
||
|
|
#define REP_3_6 16
|
||
|
|
/* repeat previous bit length 3-6 times (2 bits of repeat count) */
|
||
|
|
|
||
|
|
#define REPZ_3_10 17
|
||
|
|
/* repeat a zero length 3-10 times (3 bits of repeat count) */
|
||
|
|
|
||
|
|
#define REPZ_11_138 18
|
||
|
|
/* repeat a zero length 11-138 times (7 bits of repeat count) */
|
||
|
|
|
||
|
|
static const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
|
||
|
|
= {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
|
||
|
|
|
||
|
|
static const int extra_dbits[D_CODES] /* extra bits for each distance code */
|
||
|
|
= {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
|
||
|
|
|
||
|
|
static const int extra_blbits[BL_CODES] /* extra bits for each bit length code */
|
||
|
|
= {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
|
||
|
|
|
||
|
|
static const unsigned char bl_order[BL_CODES]
|
||
|
|
= {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
|
||
|
|
/* The lengths of the bit length codes are sent in order of decreasing
|
||
|
|
* probability, to avoid transmitting the lengths for unused bit length codes.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/* Function definitions */
|
||
|
|
void gen_codes (ct_data *tree, int max_code, uint16_t *bl_count);
|
||
|
|
|
||
|
|
#endif
|