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The Independent JPEG Group's JPEG software v9

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This commit is contained in:
Guido Vollbeding
2013-01-13 00:00:00 +00:00
committed by DRC
parent 5829cb2398
commit e7f88aec23
54 changed files with 3074 additions and 3803 deletions
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38
jdarith.c
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@@ -1,7 +1,7 @@
/*
* jdarith.c
*
* Developed 1997-2011 by Guido Vollbeding.
* Developed 1997-2012 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.
*
@@ -345,12 +345,15 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
/* Sections F.2.4.2 & F.1.4.4.2: Decoding of AC coefficients */
/* Figure F.20: Decode_AC_coefficients */
for (k = cinfo->Ss; k <= cinfo->Se; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
k = cinfo->Ss - 1;
do {
st = entropy->ac_stats[tbl] + 3 * k;
if (arith_decode(cinfo, st)) break; /* EOB flag */
while (arith_decode(cinfo, st + 1) == 0) {
st += 3; k++;
if (k > cinfo->Se) {
for (;;) {
k++;
if (arith_decode(cinfo, st + 1)) break;
st += 3;
if (k >= cinfo->Se) {
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
entropy->ct = -1; /* spectral overflow */
return TRUE;
@@ -384,7 +387,7 @@ decode_mcu_AC_first (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
v += 1; if (sign) v = -v;
/* Scale and output coefficient in natural (dezigzagged) order */
(*block)[natural_order[k]] = (JCOEF) (v << cinfo->Al);
}
} while (k < cinfo->Se);
return TRUE;
}
@@ -457,15 +460,18 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
/* Establish EOBx (previous stage end-of-block) index */
for (kex = cinfo->Se; kex > 0; kex--)
kex = cinfo->Se;
do {
if ((*block)[natural_order[kex]]) break;
} while (--kex);
for (k = cinfo->Ss; k <= cinfo->Se; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
if (k > kex)
k = cinfo->Ss - 1;
do {
st = entropy->ac_stats[tbl] + 3 * k;
if (k >= kex)
if (arith_decode(cinfo, st)) break; /* EOB flag */
for (;;) {
thiscoef = *block + natural_order[k];
thiscoef = *block + natural_order[++k];
if (*thiscoef) { /* previously nonzero coef */
if (arith_decode(cinfo, st + 2)) {
if (*thiscoef < 0)
@@ -482,14 +488,14 @@ decode_mcu_AC_refine (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
*thiscoef = p1;
break;
}
st += 3; k++;
if (k > cinfo->Se) {
st += 3;
if (k >= cinfo->Se) {
WARNMS(cinfo, JWRN_ARITH_BAD_CODE);
entropy->ct = -1; /* spectral overflow */
return TRUE;
}
}
}
} while (k < cinfo->Se);
return TRUE;
}
@@ -750,7 +756,7 @@ jinit_arith_decoder (j_decompress_ptr cinfo)
entropy = (arith_entropy_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
SIZEOF(arith_entropy_decoder));
cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
cinfo->entropy = &entropy->pub;
entropy->pub.start_pass = start_pass;
/* Mark tables unallocated */