summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/libjpeg/jdhuff.c
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/libjpeg/jdhuff.c')
-rw-r--r--3rdparty/libjpeg/jdhuff.c69
1 files changed, 41 insertions, 28 deletions
diff --git a/3rdparty/libjpeg/jdhuff.c b/3rdparty/libjpeg/jdhuff.c
index 06f92fe47f6..6920e207c8e 100644
--- a/3rdparty/libjpeg/jdhuff.c
+++ b/3rdparty/libjpeg/jdhuff.c
@@ -2,7 +2,7 @@
* jdhuff.c
*
* Copyright (C) 1991-1997, Thomas G. Lane.
- * Modified 2006-2009 by Guido Vollbeding.
+ * Modified 2006-2013 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
@@ -628,6 +628,22 @@ jpeg_huff_decode (bitread_working_state * state,
/*
+ * Finish up at the end of a Huffman-compressed scan.
+ */
+
+METHODDEF(void)
+finish_pass_huff (j_decompress_ptr cinfo)
+{
+ huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
+
+ /* Throw away any unused bits remaining in bit buffer; */
+ /* include any full bytes in next_marker's count of discarded bytes */
+ cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
+ entropy->bitstate.bits_left = 0;
+}
+
+
+/*
* Check for a restart marker & resynchronize decoder.
* Returns FALSE if must suspend.
*/
@@ -638,10 +654,7 @@ process_restart (j_decompress_ptr cinfo)
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
int ci;
- /* Throw away any unused bits remaining in bit buffer; */
- /* include any full bytes in next_marker's count of discarded bytes */
- cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
- entropy->bitstate.bits_left = 0;
+ finish_pass_huff(cinfo);
/* Advance past the RSTn marker */
if (! (*cinfo->marker->read_restart_marker) (cinfo))
@@ -797,7 +810,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* There is always only one block per MCU */
- if (EOBRUN > 0) /* if it's a band of zeroes... */
+ if (EOBRUN) /* if it's a band of zeroes... */
EOBRUN--; /* ...process it now (we do nothing) */
else {
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
@@ -816,18 +829,17 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[natural_order[k]] = (JCOEF) (s << Al);
} else {
- if (r == 15) { /* ZRL */
- k += 15; /* skip 15 zeroes in band */
- } else { /* EOBr, run length is 2^r + appended bits */
- EOBRUN = 1 << r;
+ if (r != 15) { /* EOBr, run length is 2^r + appended bits */
if (r) { /* EOBr, r > 0 */
+ EOBRUN = 1 << r;
CHECK_BIT_BUFFER(br_state, r, return FALSE);
r = GET_BITS(r);
EOBRUN += r;
+ EOBRUN--; /* this band is processed at this moment */
}
- EOBRUN--; /* this band is processed at this moment */
break; /* force end-of-band */
}
+ k += 15; /* ZRL: skip 15 zeroes in band */
}
}
@@ -847,17 +859,15 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/*
* MCU decoding for DC successive approximation refinement scan.
- * Note: we assume such scans can be multi-component, although the spec
- * is not very clear on the point.
+ * Note: we assume such scans can be multi-component,
+ * although the spec is not very clear on the point.
*/
METHODDEF(boolean)
decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
{
huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy;
- int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
- int blkn;
- JBLOCKROW block;
+ int p1, blkn;
BITREAD_STATE_VARS;
/* Process restart marker if needed; may have to suspend */
@@ -874,15 +884,15 @@ decode_mcu_DC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* Load up working state */
BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
+ p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
+
/* Outer loop handles each block in the MCU */
for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
- block = MCU_data[blkn];
-
/* Encoded data is simply the next bit of the two's-complement DC value */
CHECK_BIT_BUFFER(br_state, 1, return FALSE);
if (GET_BITS(1))
- (*block)[0] |= p1;
+ MCU_data[blkn][0][0] |= p1;
/* Note: since we use |=, repeating the assignment later is safe */
}
@@ -951,7 +961,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
k = cinfo->Ss;
if (EOBRUN == 0) {
- for (; k <= Se; k++) {
+ do {
HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
r = s >> 4;
s &= 15;
@@ -981,7 +991,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
*/
do {
thiscoef = *block + natural_order[k];
- if (*thiscoef != 0) {
+ if (*thiscoef) {
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
if (GET_BITS(1)) {
if ((*thiscoef & p1) == 0) { /* do nothing if already set it */
@@ -1004,18 +1014,19 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* Remember its position in case we have to suspend */
newnz_pos[num_newnz++] = pos;
}
- }
+ k++;
+ } while (k <= Se);
}
- if (EOBRUN > 0) {
+ if (EOBRUN) {
/* Scan any remaining coefficient positions after the end-of-band
* (the last newly nonzero coefficient, if any). Append a correction
* bit to each already-nonzero coefficient. A correction bit is 1
* if the absolute value of the coefficient must be increased.
*/
- for (; k <= Se; k++) {
+ do {
thiscoef = *block + natural_order[k];
- if (*thiscoef != 0) {
+ if (*thiscoef) {
CHECK_BIT_BUFFER(br_state, 1, goto undoit);
if (GET_BITS(1)) {
if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
@@ -1026,7 +1037,8 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
}
}
}
- }
+ k++;
+ } while (k <= Se);
/* Count one block completed in EOB run */
EOBRUN--;
}
@@ -1043,7 +1055,7 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
undoit:
/* Re-zero any output coefficients that we made newly nonzero */
- while (num_newnz > 0)
+ while (num_newnz)
(*block)[newnz_pos[--num_newnz]] = 0;
return FALSE;
@@ -1514,8 +1526,9 @@ jinit_huff_decoder (j_decompress_ptr cinfo)
entropy = (huff_entropy_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(huff_entropy_decoder));
- cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
+ cinfo->entropy = &entropy->pub;
entropy->pub.start_pass = start_pass_huff_decoder;
+ entropy->pub.finish_pass = finish_pass_huff;
if (cinfo->progressive_mode) {
/* Create progression status table */