mirror of
https://github.com/opencv/opencv.git
synced 2024-12-26 02:28:04 +08:00
0de26fd78e
Zlib-ng is zlib replacement with optimizations for "next generation" systems. Its optimization may benifits image library decode and encode speed such as libpng. In our tests, if using zlib-ng and libpng combination on a x86_64 machine with AVX2, the time of `imdecode` amd `imencode` will drop 20% approximately. This patch enables zlib-ng's optimization if `CV_DISABLE_OPTIMIZATION` is OFF. Since Zlib-ng can dispatch intrinsics on the fly, port work is much easier. Related discussion: https://github.com/opencv/opencv/issues/22573
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
|