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
117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/* deflate_p.h -- Private inline functions and macros shared with more than
|
|
* one deflate method
|
|
*
|
|
* Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*
|
|
*/
|
|
|
|
#ifndef DEFLATE_P_H
|
|
#define DEFLATE_P_H
|
|
|
|
/* Forward declare common non-inlined functions declared in deflate.c */
|
|
|
|
#ifdef ZLIB_DEBUG
|
|
/* ===========================================================================
|
|
* Check that the match at match_start is indeed a match.
|
|
*/
|
|
static inline void check_match(deflate_state *s, Pos start, Pos match, int length) {
|
|
/* check that the match length is valid*/
|
|
if (length < STD_MIN_MATCH || length > STD_MAX_MATCH) {
|
|
fprintf(stderr, " start %u, match %u, length %d\n", start, match, length);
|
|
z_error("invalid match length");
|
|
}
|
|
/* check that the match isn't at the same position as the start string */
|
|
if (match == start) {
|
|
fprintf(stderr, " start %u, match %u, length %d\n", start, match, length);
|
|
z_error("invalid match position");
|
|
}
|
|
/* check that the match is indeed a match */
|
|
if (memcmp(s->window + match, s->window + start, length) != 0) {
|
|
int32_t i = 0;
|
|
fprintf(stderr, " start %u, match %u, length %d\n", start, match, length);
|
|
do {
|
|
fprintf(stderr, " %03d: match [%02x] start [%02x]\n", i++,
|
|
s->window[match++], s->window[start++]);
|
|
} while (--length != 0);
|
|
z_error("invalid match");
|
|
}
|
|
if (z_verbose > 1) {
|
|
fprintf(stderr, "\\[%u,%d]", start-match, length);
|
|
do {
|
|
putc(s->window[start++], stderr);
|
|
} while (--length != 0);
|
|
}
|
|
}
|
|
#else
|
|
#define check_match(s, start, match, length)
|
|
#endif
|
|
|
|
Z_INTERNAL void PREFIX(flush_pending)(PREFIX3(stream) *strm);
|
|
Z_INTERNAL unsigned PREFIX(read_buf)(PREFIX3(stream) *strm, unsigned char *buf, unsigned size);
|
|
|
|
/* ===========================================================================
|
|
* Save the match info and tally the frequency counts. Return true if
|
|
* the current block must be flushed.
|
|
*/
|
|
|
|
extern const unsigned char Z_INTERNAL zng_length_code[];
|
|
extern const unsigned char Z_INTERNAL zng_dist_code[];
|
|
|
|
static inline int zng_tr_tally_lit(deflate_state *s, unsigned char c) {
|
|
/* c is the unmatched char */
|
|
s->sym_buf[s->sym_next++] = 0;
|
|
s->sym_buf[s->sym_next++] = 0;
|
|
s->sym_buf[s->sym_next++] = c;
|
|
s->dyn_ltree[c].Freq++;
|
|
Tracevv((stderr, "%c", c));
|
|
Assert(c <= (STD_MAX_MATCH-STD_MIN_MATCH), "zng_tr_tally: bad literal");
|
|
return (s->sym_next == s->sym_end);
|
|
}
|
|
|
|
static inline int zng_tr_tally_dist(deflate_state *s, uint32_t dist, uint32_t len) {
|
|
/* dist: distance of matched string */
|
|
/* len: match length-STD_MIN_MATCH */
|
|
s->sym_buf[s->sym_next++] = (uint8_t)(dist);
|
|
s->sym_buf[s->sym_next++] = (uint8_t)(dist >> 8);
|
|
s->sym_buf[s->sym_next++] = (uint8_t)len;
|
|
s->matches++;
|
|
dist--;
|
|
Assert(dist < MAX_DIST(s) && (uint16_t)d_code(dist) < (uint16_t)D_CODES,
|
|
"zng_tr_tally: bad match");
|
|
|
|
s->dyn_ltree[zng_length_code[len]+LITERALS+1].Freq++;
|
|
s->dyn_dtree[d_code(dist)].Freq++;
|
|
return (s->sym_next == s->sym_end);
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Flush the current block, with given end-of-file flag.
|
|
* IN assertion: strstart is set to the end of the current match.
|
|
*/
|
|
#define FLUSH_BLOCK_ONLY(s, last) { \
|
|
zng_tr_flush_block(s, (s->block_start >= 0 ? \
|
|
(char *)&s->window[(unsigned)s->block_start] : \
|
|
NULL), \
|
|
(uint32_t)((int)s->strstart - s->block_start), \
|
|
(last)); \
|
|
s->block_start = (int)s->strstart; \
|
|
PREFIX(flush_pending)(s->strm); \
|
|
}
|
|
|
|
/* Same but force premature exit if necessary. */
|
|
#define FLUSH_BLOCK(s, last) { \
|
|
FLUSH_BLOCK_ONLY(s, last); \
|
|
if (s->strm->avail_out == 0) return (last) ? finish_started : need_more; \
|
|
}
|
|
|
|
/* Maximum stored block length in deflate format (not including header). */
|
|
#define MAX_STORED 65535
|
|
|
|
/* Compression function. Returns the block state after the call. */
|
|
typedef block_state (*compress_func) (deflate_state *s, int flush);
|
|
/* Match function. Returns the longest match. */
|
|
typedef uint32_t (*match_func) (deflate_state *const s, Pos cur_match);
|
|
|
|
#endif
|