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