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Unified Diff: jchuff.c

Issue 1934113002: Update libjpeg_turbo to 1.4.90 from https://github.com/libjpeg-turbo/ (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git@master
Patch Set: Created 4 years, 8 months ago
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Index: jchuff.c
diff --git a/jchuff.c b/jchuff.c
index 68e4e0e0337ea9810eeccaad507cbfc72b2a2b8e..58acd705b25f05657f2ba7db049864251c36ee83 100644
--- a/jchuff.c
+++ b/jchuff.c
@@ -4,8 +4,10 @@
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1991-1997, Thomas G. Lane.
* libjpeg-turbo Modifications:
- * Copyright (C) 2009-2011, D. R. Commander.
- * For conditions of distribution and use, see the accompanying README file.
+ * Copyright (C) 2009-2011, 2014-2016 D. R. Commander.
+ * Copyright (C) 2015 Matthieu Darbois.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
*
* This file contains Huffman entropy encoding routines.
*
@@ -19,7 +21,8 @@
#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"
-#include "jchuff.h" /* Declarations shared with jcphuff.c */
+#include "jsimd.h"
+#include "jconfigint.h"
#include <limits.h>
/*
@@ -37,7 +40,7 @@
*/
/* NOTE: Both GCC and Clang define __GNUC__ */
-#if defined __GNUC__ && defined __arm__
+#if defined __GNUC__ && (defined __arm__ || defined __aarch64__)
#if !defined __thumb__ || defined __thumb2__
#define USE_CLZ_INTRINSIC
#endif
@@ -47,8 +50,7 @@
#define JPEG_NBITS_NONZERO(x) (32 - __builtin_clz(x))
#define JPEG_NBITS(x) (x ? JPEG_NBITS_NONZERO(x) : 0)
#else
-static unsigned char jpeg_nbits_table[65536];
-static int jpeg_nbits_table_init = 0;
+#include "jpeg_nbits_table.h"
#define JPEG_NBITS(x) (jpeg_nbits_table[x])
#define JPEG_NBITS_NONZERO(x) JPEG_NBITS(x)
#endif
@@ -65,8 +67,8 @@ static int jpeg_nbits_table_init = 0;
*/
typedef struct {
- size_t put_buffer; /* current bit-accumulation buffer */
- int put_bits; /* # of bits now in it */
+ size_t put_buffer; /* current bit-accumulation buffer */
+ int put_bits; /* # of bits now in it */
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
} savable_state;
@@ -80,12 +82,12 @@ typedef struct {
#else
#if MAX_COMPS_IN_SCAN == 4
#define ASSIGN_STATE(dest,src) \
- ((dest).put_buffer = (src).put_buffer, \
- (dest).put_bits = (src).put_bits, \
- (dest).last_dc_val[0] = (src).last_dc_val[0], \
- (dest).last_dc_val[1] = (src).last_dc_val[1], \
- (dest).last_dc_val[2] = (src).last_dc_val[2], \
- (dest).last_dc_val[3] = (src).last_dc_val[3])
+ ((dest).put_buffer = (src).put_buffer, \
+ (dest).put_bits = (src).put_bits, \
+ (dest).last_dc_val[0] = (src).last_dc_val[0], \
+ (dest).last_dc_val[1] = (src).last_dc_val[1], \
+ (dest).last_dc_val[2] = (src).last_dc_val[2], \
+ (dest).last_dc_val[3] = (src).last_dc_val[3])
#endif
#endif
@@ -93,44 +95,45 @@ typedef struct {
typedef struct {
struct jpeg_entropy_encoder pub; /* public fields */
- savable_state saved; /* Bit buffer & DC state at start of MCU */
+ savable_state saved; /* Bit buffer & DC state at start of MCU */
/* These fields are NOT loaded into local working state. */
- unsigned int restarts_to_go; /* MCUs left in this restart interval */
- int next_restart_num; /* next restart number to write (0-7) */
+ unsigned int restarts_to_go; /* MCUs left in this restart interval */
+ int next_restart_num; /* next restart number to write (0-7) */
/* Pointers to derived tables (these workspaces have image lifespan) */
- c_derived_tbl * dc_derived_tbls[NUM_HUFF_TBLS];
- c_derived_tbl * ac_derived_tbls[NUM_HUFF_TBLS];
+ c_derived_tbl *dc_derived_tbls[NUM_HUFF_TBLS];
+ c_derived_tbl *ac_derived_tbls[NUM_HUFF_TBLS];
-#ifdef ENTROPY_OPT_SUPPORTED /* Statistics tables for optimization */
- long * dc_count_ptrs[NUM_HUFF_TBLS];
- long * ac_count_ptrs[NUM_HUFF_TBLS];
+#ifdef ENTROPY_OPT_SUPPORTED /* Statistics tables for optimization */
+ long *dc_count_ptrs[NUM_HUFF_TBLS];
+ long *ac_count_ptrs[NUM_HUFF_TBLS];
#endif
+
+ int simd;
} huff_entropy_encoder;
-typedef huff_entropy_encoder * huff_entropy_ptr;
+typedef huff_entropy_encoder *huff_entropy_ptr;
/* Working state while writing an MCU.
* This struct contains all the fields that are needed by subroutines.
*/
typedef struct {
- JOCTET * next_output_byte; /* => next byte to write in buffer */
- size_t free_in_buffer; /* # of byte spaces remaining in buffer */
- savable_state cur; /* Current bit buffer & DC state */
- j_compress_ptr cinfo; /* dump_buffer needs access to this */
+ JOCTET *next_output_byte; /* => next byte to write in buffer */
+ size_t free_in_buffer; /* # of byte spaces remaining in buffer */
+ savable_state cur; /* Current bit buffer & DC state */
+ j_compress_ptr cinfo; /* dump_buffer needs access to this */
} working_state;
/* Forward declarations */
-METHODDEF(boolean) encode_mcu_huff JPP((j_compress_ptr cinfo,
- JBLOCKROW *MCU_data));
-METHODDEF(void) finish_pass_huff JPP((j_compress_ptr cinfo));
+METHODDEF(boolean) encode_mcu_huff (j_compress_ptr cinfo, JBLOCKROW *MCU_data);
+METHODDEF(void) finish_pass_huff (j_compress_ptr cinfo);
#ifdef ENTROPY_OPT_SUPPORTED
-METHODDEF(boolean) encode_mcu_gather JPP((j_compress_ptr cinfo,
- JBLOCKROW *MCU_data));
-METHODDEF(void) finish_pass_gather JPP((j_compress_ptr cinfo));
+METHODDEF(boolean) encode_mcu_gather (j_compress_ptr cinfo,
+ JBLOCKROW *MCU_data);
+METHODDEF(void) finish_pass_gather (j_compress_ptr cinfo);
#endif
@@ -145,7 +148,7 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci, dctbl, actbl;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
if (gather_statistics) {
#ifdef ENTROPY_OPT_SUPPORTED
@@ -159,6 +162,8 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
entropy->pub.finish_pass = finish_pass_huff;
}
+ entropy->simd = jsimd_can_huff_encode_one_block();
+
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
dctbl = compptr->dc_tbl_no;
@@ -168,29 +173,29 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
/* Check for invalid table indexes */
/* (make_c_derived_tbl does this in the other path) */
if (dctbl < 0 || dctbl >= NUM_HUFF_TBLS)
- ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, dctbl);
+ ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, dctbl);
if (actbl < 0 || actbl >= NUM_HUFF_TBLS)
- ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, actbl);
+ ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, actbl);
/* Allocate and zero the statistics tables */
/* Note that jpeg_gen_optimal_table expects 257 entries in each table! */
if (entropy->dc_count_ptrs[dctbl] == NULL)
- entropy->dc_count_ptrs[dctbl] = (long *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- 257 * SIZEOF(long));
- MEMZERO(entropy->dc_count_ptrs[dctbl], 257 * SIZEOF(long));
+ entropy->dc_count_ptrs[dctbl] = (long *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ 257 * sizeof(long));
+ MEMZERO(entropy->dc_count_ptrs[dctbl], 257 * sizeof(long));
if (entropy->ac_count_ptrs[actbl] == NULL)
- entropy->ac_count_ptrs[actbl] = (long *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- 257 * SIZEOF(long));
- MEMZERO(entropy->ac_count_ptrs[actbl], 257 * SIZEOF(long));
+ entropy->ac_count_ptrs[actbl] = (long *)
+ (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+ 257 * sizeof(long));
+ MEMZERO(entropy->ac_count_ptrs[actbl], 257 * sizeof(long));
#endif
} else {
/* Compute derived values for Huffman tables */
/* We may do this more than once for a table, but it's not expensive */
jpeg_make_c_derived_tbl(cinfo, TRUE, dctbl,
- & entropy->dc_derived_tbls[dctbl]);
+ & entropy->dc_derived_tbls[dctbl]);
jpeg_make_c_derived_tbl(cinfo, FALSE, actbl,
- & entropy->ac_derived_tbls[actbl]);
+ & entropy->ac_derived_tbls[actbl]);
}
/* Initialize DC predictions to 0 */
entropy->saved.last_dc_val[ci] = 0;
@@ -215,7 +220,7 @@ start_pass_huff (j_compress_ptr cinfo, boolean gather_statistics)
GLOBAL(void)
jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
- c_derived_tbl ** pdtbl)
+ c_derived_tbl **pdtbl)
{
JHUFF_TBL *htbl;
c_derived_tbl *dtbl;
@@ -240,22 +245,22 @@ jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
if (*pdtbl == NULL)
*pdtbl = (c_derived_tbl *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(c_derived_tbl));
+ sizeof(c_derived_tbl));
dtbl = *pdtbl;
-
+
/* Figure C.1: make table of Huffman code length for each symbol */
p = 0;
for (l = 1; l <= 16; l++) {
i = (int) htbl->bits[l];
- if (i < 0 || p + i > 256) /* protect against table overrun */
+ if (i < 0 || p + i > 256) /* protect against table overrun */
ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
while (i--)
huffsize[p++] = (char) l;
}
huffsize[p] = 0;
lastp = p;
-
+
/* Figure C.2: generate the codes themselves */
/* We also validate that the counts represent a legal Huffman code tree. */
@@ -270,12 +275,12 @@ jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
/* code is now 1 more than the last code used for codelength si; but
* it must still fit in si bits, since no code is allowed to be all ones.
*/
- if (((INT32) code) >= (((INT32) 1) << si))
+ if (((JLONG) code) >= (((JLONG) 1) << si))
ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
code <<= 1;
si++;
}
-
+
/* Figure C.3: generate encoding tables */
/* These are code and size indexed by symbol value */
@@ -283,7 +288,7 @@ jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
* this lets us detect duplicate VAL entries here, and later
* allows emit_bits to detect any attempt to emit such symbols.
*/
- MEMZERO(dtbl->ehufsi, SIZEOF(dtbl->ehufsi));
+ MEMZERO(dtbl->ehufsi, sizeof(dtbl->ehufsi));
/* This is also a convenient place to check for out-of-range
* and duplicated VAL entries. We allow 0..255 for AC symbols
@@ -299,17 +304,6 @@ jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
dtbl->ehufco[i] = huffcode[p];
dtbl->ehufsi[i] = huffsize[p];
}
-
-#ifndef USE_CLZ_INTRINSIC
- if(!jpeg_nbits_table_init) {
- for(i = 0; i < 65536; i++) {
- int nbits = 0, temp = i;
- while (temp) {temp >>= 1; nbits++;}
- jpeg_nbits_table[i] = nbits;
- }
- jpeg_nbits_table_init = 1;
- }
-#endif
}
@@ -317,17 +311,17 @@ jpeg_make_c_derived_tbl (j_compress_ptr cinfo, boolean isDC, int tblno,
/* Emit a byte, taking 'action' if must suspend. */
#define emit_byte(state,val,action) \
- { *(state)->next_output_byte++ = (JOCTET) (val); \
- if (--(state)->free_in_buffer == 0) \
- if (! dump_buffer(state)) \
- { action; } }
+ { *(state)->next_output_byte++ = (JOCTET) (val); \
+ if (--(state)->free_in_buffer == 0) \
+ if (! dump_buffer(state)) \
+ { action; } }
LOCAL(boolean)
-dump_buffer (working_state * state)
+dump_buffer (working_state *state)
/* Empty the output buffer; return TRUE if successful, FALSE if must suspend */
{
- struct jpeg_destination_mgr * dest = state->cinfo->dest;
+ struct jpeg_destination_mgr *dest = state->cinfo->dest;
if (! (*dest->empty_output_buffer) (state->cinfo))
return FALSE;
@@ -389,7 +383,11 @@ dump_buffer (working_state * state)
} \
}
-#if __WORDSIZE==64 || defined(_WIN64)
+#if !defined(_WIN32) && !defined(SIZEOF_SIZE_T)
+#error Cannot determine word size
+#endif
+
+#if SIZEOF_SIZE_T==8 || defined(_WIN64)
#define EMIT_BITS(code, size) { \
CHECKBUF47() \
@@ -397,7 +395,7 @@ dump_buffer (working_state * state)
}
#define EMIT_CODE(code, size) { \
- temp2 &= (((INT32) 1)<<nbits) - 1; \
+ temp2 &= (((JLONG) 1)<<nbits) - 1; \
CHECKBUF31() \
PUT_BITS(code, size) \
PUT_BITS(temp2, nbits) \
@@ -411,7 +409,7 @@ dump_buffer (working_state * state)
}
#define EMIT_CODE(code, size) { \
- temp2 &= (((INT32) 1)<<nbits) - 1; \
+ temp2 &= (((JLONG) 1)<<nbits) - 1; \
PUT_BITS(code, size) \
CHECKBUF15() \
PUT_BITS(temp2, nbits) \
@@ -421,7 +419,16 @@ dump_buffer (working_state * state)
#endif
-#define BUFSIZE (DCTSIZE2 * 2)
+/* Although it is exceedingly rare, it is possible for a Huffman-encoded
+ * coefficient block to be larger than the 128-byte unencoded block. For each
+ * of the 64 coefficients, PUT_BITS is invoked twice, and each invocation can
+ * theoretically store 16 bits (for a maximum of 2048 bits or 256 bytes per
+ * encoded block.) If, for instance, one artificially sets the AC
+ * coefficients to alternating values of 32767 and -32768 (using the JPEG
+ * scanning order-- 1, 8, 16, etc.), then this will produce an encoded block
+ * larger than 200 bytes.
+ */
+#define BUFSIZE (DCTSIZE2 * 4)
#define LOAD_BUFFER() { \
if (state->free_in_buffer < BUFSIZE) { \
@@ -454,7 +461,7 @@ dump_buffer (working_state * state)
LOCAL(boolean)
-flush_bits (working_state * state)
+flush_bits (working_state *state)
{
JOCTET _buffer[BUFSIZE], *buffer;
size_t put_buffer; int put_bits;
@@ -468,7 +475,7 @@ flush_bits (working_state * state)
PUT_BITS(0x7F, 7)
while (put_bits >= 8) EMIT_BYTE()
- state->cur.put_buffer = 0; /* and reset bit-buffer to empty */
+ state->cur.put_buffer = 0; /* and reset bit-buffer to empty */
state->cur.put_bits = 0;
STORE_BUFFER()
@@ -479,8 +486,25 @@ flush_bits (working_state * state)
/* Encode a single block's worth of coefficients */
LOCAL(boolean)
-encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
- c_derived_tbl *dctbl, c_derived_tbl *actbl)
+encode_one_block_simd (working_state *state, JCOEFPTR block, int last_dc_val,
+ c_derived_tbl *dctbl, c_derived_tbl *actbl)
+{
+ JOCTET _buffer[BUFSIZE], *buffer;
+ size_t bytes, bytestocopy; int localbuf = 0;
+
+ LOAD_BUFFER()
+
+ buffer = jsimd_huff_encode_one_block(state, buffer, block, last_dc_val,
+ dctbl, actbl);
+
+ STORE_BUFFER()
+
+ return TRUE;
+}
+
+LOCAL(boolean)
+encode_one_block (working_state *state, JCOEFPTR block, int last_dc_val,
+ c_derived_tbl *dctbl, c_derived_tbl *actbl)
{
int temp, temp2, temp3;
int nbits;
@@ -495,7 +519,7 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
LOAD_BUFFER()
/* Encode the DC coefficient difference per section F.1.2.1 */
-
+
temp = temp2 = block[0] - last_dc_val;
/* This is a well-known technique for obtaining the absolute value without a
@@ -517,20 +541,18 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
/* Emit the Huffman-coded symbol for the number of bits */
code = dctbl->ehufco[nbits];
size = dctbl->ehufsi[nbits];
- PUT_BITS(code, size)
- CHECKBUF15()
+ EMIT_BITS(code, size)
/* Mask off any extra bits in code */
- temp2 &= (((INT32) 1)<<nbits) - 1;
+ temp2 &= (((JLONG) 1)<<nbits) - 1;
/* Emit that number of bits of the value, if positive, */
/* or the complement of its magnitude, if negative. */
- PUT_BITS(temp2, nbits)
- CHECKBUF15()
+ EMIT_BITS(temp2, nbits)
/* Encode the AC coefficients per section F.1.2.2 */
-
- r = 0; /* r = run length of zeros */
+
+ r = 0; /* r = run length of zeros */
/* Manually unroll the k loop to eliminate the counter variable. This
* improves performance greatly on systems with a limited number of
@@ -594,7 +616,7 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val,
*/
LOCAL(boolean)
-emit_restart (working_state * state, int restart_num)
+emit_restart (working_state *state, int restart_num)
{
int ci;
@@ -624,7 +646,7 @@ encode_mcu_huff (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
working_state state;
int blkn, ci;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
/* Load up working state */
state.next_output_byte = cinfo->dest->next_output_byte;
@@ -636,20 +658,34 @@ encode_mcu_huff (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
if (cinfo->restart_interval) {
if (entropy->restarts_to_go == 0)
if (! emit_restart(&state, entropy->next_restart_num))
- return FALSE;
+ return FALSE;
}
/* Encode the MCU data blocks */
- for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
- ci = cinfo->MCU_membership[blkn];
- compptr = cinfo->cur_comp_info[ci];
- if (! encode_one_block(&state,
- MCU_data[blkn][0], state.cur.last_dc_val[ci],
- entropy->dc_derived_tbls[compptr->dc_tbl_no],
- entropy->ac_derived_tbls[compptr->ac_tbl_no]))
- return FALSE;
- /* Update last_dc_val */
- state.cur.last_dc_val[ci] = MCU_data[blkn][0][0];
+ if (entropy->simd) {
+ for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+ ci = cinfo->MCU_membership[blkn];
+ compptr = cinfo->cur_comp_info[ci];
+ if (! encode_one_block_simd(&state,
+ MCU_data[blkn][0], state.cur.last_dc_val[ci],
+ entropy->dc_derived_tbls[compptr->dc_tbl_no],
+ entropy->ac_derived_tbls[compptr->ac_tbl_no]))
+ return FALSE;
+ /* Update last_dc_val */
+ state.cur.last_dc_val[ci] = MCU_data[blkn][0][0];
+ }
+ } else {
+ for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
+ ci = cinfo->MCU_membership[blkn];
+ compptr = cinfo->cur_comp_info[ci];
+ if (! encode_one_block(&state,
+ MCU_data[blkn][0], state.cur.last_dc_val[ci],
+ entropy->dc_derived_tbls[compptr->dc_tbl_no],
+ entropy->ac_derived_tbls[compptr->ac_tbl_no]))
+ return FALSE;
+ /* Update last_dc_val */
+ state.cur.last_dc_val[ci] = MCU_data[blkn][0][0];
+ }
}
/* Completed MCU, so update state */
@@ -716,18 +752,18 @@ finish_pass_huff (j_compress_ptr cinfo)
LOCAL(void)
htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val,
- long dc_counts[], long ac_counts[])
+ long dc_counts[], long ac_counts[])
{
register int temp;
register int nbits;
register int k, r;
-
+
/* Encode the DC coefficient difference per section F.1.2.1 */
-
+
temp = block[0] - last_dc_val;
if (temp < 0)
temp = -temp;
-
+
/* Find the number of bits needed for the magnitude of the coefficient */
nbits = 0;
while (temp) {
@@ -742,36 +778,36 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val,
/* Count the Huffman symbol for the number of bits */
dc_counts[nbits]++;
-
+
/* Encode the AC coefficients per section F.1.2.2 */
-
- r = 0; /* r = run length of zeros */
-
+
+ r = 0; /* r = run length of zeros */
+
for (k = 1; k < DCTSIZE2; k++) {
if ((temp = block[jpeg_natural_order[k]]) == 0) {
r++;
} else {
/* if run length > 15, must emit special run-length-16 codes (0xF0) */
while (r > 15) {
- ac_counts[0xF0]++;
- r -= 16;
+ ac_counts[0xF0]++;
+ r -= 16;
}
-
+
/* Find the number of bits needed for the magnitude of the coefficient */
if (temp < 0)
- temp = -temp;
-
+ temp = -temp;
+
/* Find the number of bits needed for the magnitude of the coefficient */
- nbits = 1; /* there must be at least one 1 bit */
+ nbits = 1; /* there must be at least one 1 bit */
while ((temp >>= 1))
- nbits++;
+ nbits++;
/* Check for out-of-range coefficient values */
if (nbits > MAX_COEF_BITS)
- ERREXIT(cinfo, JERR_BAD_DCT_COEF);
-
+ ERREXIT(cinfo, JERR_BAD_DCT_COEF);
+
/* Count Huffman symbol for run length / number of bits */
ac_counts[(r << 4) + nbits]++;
-
+
r = 0;
}
}
@@ -792,14 +828,14 @@ encode_mcu_gather (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int blkn, ci;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
/* Take care of restart intervals if needed */
if (cinfo->restart_interval) {
if (entropy->restarts_to_go == 0) {
/* Re-initialize DC predictions to 0 */
for (ci = 0; ci < cinfo->comps_in_scan; ci++)
- entropy->saved.last_dc_val[ci] = 0;
+ entropy->saved.last_dc_val[ci] = 0;
/* Update restart state */
entropy->restarts_to_go = cinfo->restart_interval;
}
@@ -810,8 +846,8 @@ encode_mcu_gather (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
ci = cinfo->MCU_membership[blkn];
compptr = cinfo->cur_comp_info[ci];
htest_one_block(cinfo, MCU_data[blkn][0], entropy->saved.last_dc_val[ci],
- entropy->dc_count_ptrs[compptr->dc_tbl_no],
- entropy->ac_count_ptrs[compptr->ac_tbl_no]);
+ entropy->dc_count_ptrs[compptr->dc_tbl_no],
+ entropy->ac_count_ptrs[compptr->ac_tbl_no]);
entropy->saved.last_dc_val[ci] = MCU_data[blkn][0][0];
}
@@ -848,24 +884,24 @@ encode_mcu_gather (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
*/
GLOBAL(void)
-jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
+jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL *htbl, long freq[])
{
-#define MAX_CLEN 32 /* assumed maximum initial code length */
- UINT8 bits[MAX_CLEN+1]; /* bits[k] = # of symbols with code length k */
- int codesize[257]; /* codesize[k] = code length of symbol k */
- int others[257]; /* next symbol in current branch of tree */
+#define MAX_CLEN 32 /* assumed maximum initial code length */
+ UINT8 bits[MAX_CLEN+1]; /* bits[k] = # of symbols with code length k */
+ int codesize[257]; /* codesize[k] = code length of symbol k */
+ int others[257]; /* next symbol in current branch of tree */
int c1, c2;
int p, i, j;
long v;
/* This algorithm is explained in section K.2 of the JPEG standard */
- MEMZERO(bits, SIZEOF(bits));
- MEMZERO(codesize, SIZEOF(codesize));
+ MEMZERO(bits, sizeof(bits));
+ MEMZERO(codesize, sizeof(codesize));
for (i = 0; i < 257; i++)
- others[i] = -1; /* init links to empty */
-
- freq[256] = 1; /* make sure 256 has a nonzero count */
+ others[i] = -1; /* init links to empty */
+
+ freq[256] = 1; /* make sure 256 has a nonzero count */
/* Including the pseudo-symbol 256 in the Huffman procedure guarantees
* that no real symbol is given code-value of all ones, because 256
* will be placed last in the largest codeword category.
@@ -880,8 +916,8 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
v = 1000000000L;
for (i = 0; i <= 256; i++) {
if (freq[i] && freq[i] <= v) {
- v = freq[i];
- c1 = i;
+ v = freq[i];
+ c1 = i;
}
}
@@ -891,15 +927,15 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
v = 1000000000L;
for (i = 0; i <= 256; i++) {
if (freq[i] && freq[i] <= v && i != c1) {
- v = freq[i];
- c2 = i;
+ v = freq[i];
+ c2 = i;
}
}
/* Done if we've merged everything into one frequency */
if (c2 < 0)
break;
-
+
/* Else merge the two counts/trees */
freq[c1] += freq[c2];
freq[c2] = 0;
@@ -910,9 +946,9 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
c1 = others[c1];
codesize[c1]++;
}
-
- others[c1] = c2; /* chain c2 onto c1's tree branch */
-
+
+ others[c1] = c2; /* chain c2 onto c1's tree branch */
+
/* Increment the codesize of everything in c2's tree branch */
codesize[c2]++;
while (others[c2] >= 0) {
@@ -927,7 +963,7 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
/* The JPEG standard seems to think that this can't happen, */
/* but I'm paranoid... */
if (codesize[i] > MAX_CLEN)
- ERREXIT(cinfo, JERR_HUFF_CLEN_OVERFLOW);
+ ERREXIT(cinfo, JERR_HUFF_CLEN_OVERFLOW);
bits[codesize[i]]++;
}
@@ -943,28 +979,28 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
* shortest nonzero BITS entry is converted into a prefix for two code words
* one bit longer.
*/
-
+
for (i = MAX_CLEN; i > 16; i--) {
while (bits[i] > 0) {
- j = i - 2; /* find length of new prefix to be used */
+ j = i - 2; /* find length of new prefix to be used */
while (bits[j] == 0)
- j--;
-
- bits[i] -= 2; /* remove two symbols */
- bits[i-1]++; /* one goes in this length */
- bits[j+1] += 2; /* two new symbols in this length */
- bits[j]--; /* symbol of this length is now a prefix */
+ j--;
+
+ bits[i] -= 2; /* remove two symbols */
+ bits[i-1]++; /* one goes in this length */
+ bits[j+1] += 2; /* two new symbols in this length */
+ bits[j]--; /* symbol of this length is now a prefix */
}
}
/* Remove the count for the pseudo-symbol 256 from the largest codelength */
- while (bits[i] == 0) /* find largest codelength still in use */
+ while (bits[i] == 0) /* find largest codelength still in use */
i--;
bits[i]--;
-
+
/* Return final symbol counts (only for lengths 0..16) */
- MEMCOPY(htbl->bits, bits, SIZEOF(htbl->bits));
-
+ MEMCOPY(htbl->bits, bits, sizeof(htbl->bits));
+
/* Return a list of the symbols sorted by code length */
/* It's not real clear to me why we don't need to consider the codelength
* changes made above, but the JPEG spec seems to think this works.
@@ -973,8 +1009,8 @@ jpeg_gen_optimal_table (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])
for (i = 1; i <= MAX_CLEN; i++) {
for (j = 0; j <= 255; j++) {
if (codesize[j] == i) {
- htbl->huffval[p] = (UINT8) j;
- p++;
+ htbl->huffval[p] = (UINT8) j;
+ p++;
}
}
}
@@ -993,7 +1029,7 @@ finish_pass_gather (j_compress_ptr cinfo)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci, dctbl, actbl;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
JHUFF_TBL **htblptr;
boolean did_dc[NUM_HUFF_TBLS];
boolean did_ac[NUM_HUFF_TBLS];
@@ -1001,8 +1037,8 @@ finish_pass_gather (j_compress_ptr cinfo)
/* It's important not to apply jpeg_gen_optimal_table more than once
* per table, because it clobbers the input frequency counts!
*/
- MEMZERO(did_dc, SIZEOF(did_dc));
- MEMZERO(did_ac, SIZEOF(did_ac));
+ MEMZERO(did_dc, sizeof(did_dc));
+ MEMZERO(did_ac, sizeof(did_ac));
for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
compptr = cinfo->cur_comp_info[ci];
@@ -1011,14 +1047,14 @@ finish_pass_gather (j_compress_ptr cinfo)
if (! did_dc[dctbl]) {
htblptr = & cinfo->dc_huff_tbl_ptrs[dctbl];
if (*htblptr == NULL)
- *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+ *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->dc_count_ptrs[dctbl]);
did_dc[dctbl] = TRUE;
}
if (! did_ac[actbl]) {
htblptr = & cinfo->ac_huff_tbl_ptrs[actbl];
if (*htblptr == NULL)
- *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+ *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
jpeg_gen_optimal_table(cinfo, *htblptr, entropy->ac_count_ptrs[actbl]);
did_ac[actbl] = TRUE;
}
@@ -1041,7 +1077,7 @@ jinit_huff_encoder (j_compress_ptr cinfo)
entropy = (huff_entropy_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(huff_entropy_encoder));
+ sizeof(huff_entropy_encoder));
cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
entropy->pub.start_pass = start_pass_huff;

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