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Unified Diff: jcarith.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: jcarith.c
diff --git a/jcarith.c b/jcarith.c
index a9ca1c338c6284fe34e65ed8377e0a81abc52b8b..6d3b8af5b41dbeeccc009027b7aed89352af817e 100644
--- a/jcarith.c
+++ b/jcarith.c
@@ -1,9 +1,12 @@
/*
* jcarith.c
*
+ * This file was part of the Independent JPEG Group's software:
* Developed 1997-2009 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.
+ * libjpeg-turbo Modifications:
+ * Copyright (C) 2015, D. R. Commander.
+ * For conditions of distribution and use, see the accompanying README.ijg
+ * file.
*
* This file contains portable arithmetic entropy encoding routines for JPEG
* (implementing the ISO/IEC IS 10918-1 and CCITT Recommendation ITU-T T.81).
@@ -23,10 +26,10 @@
typedef struct {
struct jpeg_entropy_encoder pub; /* public fields */
- INT32 c; /* C register, base of coding interval, layout as in sec. D.1.3 */
- INT32 a; /* A register, normalized size of coding interval */
- INT32 sc; /* counter for stacked 0xFF values which might overflow */
- INT32 zc; /* counter for pending 0x00 output values which might *
+ JLONG c; /* C register, base of coding interval, layout as in sec. D.1.3 */
+ JLONG a; /* A register, normalized size of coding interval */
+ JLONG sc; /* counter for stacked 0xFF values which might overflow */
+ JLONG zc; /* counter for pending 0x00 output values which might *
* be discarded at the end ("Pacman" termination) */
int ct; /* bit shift counter, determines when next byte will be written */
int buffer; /* buffer for most recent output byte != 0xFF */
@@ -34,18 +37,18 @@ typedef struct {
int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
int dc_context[MAX_COMPS_IN_SCAN]; /* context index for DC conditioning */
- 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 statistics areas (these workspaces have image lifespan) */
- unsigned char * dc_stats[NUM_ARITH_TBLS];
- unsigned char * ac_stats[NUM_ARITH_TBLS];
+ unsigned char *dc_stats[NUM_ARITH_TBLS];
+ unsigned char *ac_stats[NUM_ARITH_TBLS];
/* Statistics bin for coding with fixed probability 0.5 */
unsigned char fixed_bin[4];
} arith_entropy_encoder;
-typedef arith_entropy_encoder * arith_entropy_ptr;
+typedef arith_entropy_encoder *arith_entropy_ptr;
/* The following two definitions specify the allocation chunk size
* for the statistics area.
@@ -95,20 +98,20 @@ typedef arith_entropy_encoder * arith_entropy_ptr;
#define CALCULATE_SPECTRAL_CONDITIONING
*/
-/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32.
- * We assume that int right shift is unsigned if INT32 right shift is,
+/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than JLONG.
+ * We assume that int right shift is unsigned if JLONG right shift is,
* which should be safe.
*/
#ifdef RIGHT_SHIFT_IS_UNSIGNED
-#define ISHIFT_TEMPS int ishift_temp;
+#define ISHIFT_TEMPS int ishift_temp;
#define IRIGHT_SHIFT(x,shft) \
- ((ishift_temp = (x)) < 0 ? \
- (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
- (ishift_temp >> (shft)))
+ ((ishift_temp = (x)) < 0 ? \
+ (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \
+ (ishift_temp >> (shft)))
#else
#define ISHIFT_TEMPS
-#define IRIGHT_SHIFT(x,shft) ((x) >> (shft))
+#define IRIGHT_SHIFT(x,shft) ((x) >> (shft))
#endif
@@ -116,7 +119,7 @@ LOCAL(void)
emit_byte (int val, j_compress_ptr cinfo)
/* Write next output byte; we do not support suspension in this module. */
{
- struct jpeg_destination_mgr * dest = cinfo->dest;
+ struct jpeg_destination_mgr *dest = cinfo->dest;
*dest->next_output_byte++ = (JOCTET) val;
if (--dest->free_in_buffer == 0)
@@ -133,7 +136,7 @@ METHODDEF(void)
finish_pass (j_compress_ptr cinfo)
{
arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
- INT32 temp;
+ JLONG temp;
/* Section D.1.8: Termination of encoding */
@@ -149,11 +152,11 @@ finish_pass (j_compress_ptr cinfo)
/* One final overflow has to be handled */
if (e->buffer >= 0) {
if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
emit_byte(e->buffer + 1, cinfo);
if (e->buffer + 1 == 0xFF)
- emit_byte(0x00, cinfo);
+ emit_byte(0x00, cinfo);
}
e->zc += e->sc; /* carry-over converts stacked 0xFF bytes to 0x00 */
e->sc = 0;
@@ -162,17 +165,17 @@ finish_pass (j_compress_ptr cinfo)
++e->zc;
else if (e->buffer >= 0) {
if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
emit_byte(e->buffer, cinfo);
}
if (e->sc) {
if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
do {
- emit_byte(0xFF, cinfo);
- emit_byte(0x00, cinfo);
+ emit_byte(0xFF, cinfo);
+ emit_byte(0x00, cinfo);
} while (--e->sc);
}
}
@@ -187,7 +190,7 @@ finish_pass (j_compress_ptr cinfo)
if (e->c & 0x7F800L) {
emit_byte((e->c >> 11) & 0xFF, cinfo);
if (((e->c >> 11) & 0xFF) == 0xFF)
- emit_byte(0x00, cinfo);
+ emit_byte(0x00, cinfo);
}
}
}
@@ -216,20 +219,20 @@ finish_pass (j_compress_ptr cinfo)
*/
LOCAL(void)
-arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
+arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
{
register arith_entropy_ptr e = (arith_entropy_ptr) cinfo->entropy;
register unsigned char nl, nm;
- register INT32 qe, temp;
+ register JLONG qe, temp;
register int sv;
/* Fetch values from our compact representation of Table D.2:
* Qe values and probability estimation state machine
*/
sv = *st;
- qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
- nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
- nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
+ qe = jpeg_aritab[sv & 0x7F]; /* => Qe_Value */
+ nl = qe & 0xFF; qe >>= 8; /* Next_Index_LPS + Switch_MPS */
+ nm = qe & 0xFF; qe >>= 8; /* Next_Index_MPS */
/* Encode & estimation procedures per sections D.1.4 & D.1.5 */
e->a -= qe;
@@ -243,7 +246,7 @@ arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
e->c += e->a;
e->a = qe;
}
- *st = (sv & 0x80) ^ nl; /* Estimate_after_LPS */
+ *st = (sv & 0x80) ^ nl; /* Estimate_after_LPS */
} else {
/* Encode the more probable symbol */
if (e->a >= 0x8000L)
@@ -255,7 +258,7 @@ arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
e->c += e->a;
e->a = qe;
}
- *st = (sv & 0x80) ^ nm; /* Estimate_after_MPS */
+ *st = (sv & 0x80) ^ nm; /* Estimate_after_MPS */
}
/* Renormalization & data output per section D.1.6 */
@@ -266,43 +269,43 @@ arith_encode (j_compress_ptr cinfo, unsigned char *st, int val)
/* Another byte is ready for output */
temp = e->c >> 19;
if (temp > 0xFF) {
- /* Handle overflow over all stacked 0xFF bytes */
- if (e->buffer >= 0) {
- if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
- emit_byte(e->buffer + 1, cinfo);
- if (e->buffer + 1 == 0xFF)
- emit_byte(0x00, cinfo);
- }
- e->zc += e->sc; /* carry-over converts stacked 0xFF bytes to 0x00 */
- e->sc = 0;
- /* Note: The 3 spacer bits in the C register guarantee
- * that the new buffer byte can't be 0xFF here
- * (see page 160 in the P&M JPEG book). */
- e->buffer = temp & 0xFF; /* new output byte, might overflow later */
+ /* Handle overflow over all stacked 0xFF bytes */
+ if (e->buffer >= 0) {
+ if (e->zc)
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
+ emit_byte(e->buffer + 1, cinfo);
+ if (e->buffer + 1 == 0xFF)
+ emit_byte(0x00, cinfo);
+ }
+ e->zc += e->sc; /* carry-over converts stacked 0xFF bytes to 0x00 */
+ e->sc = 0;
+ /* Note: The 3 spacer bits in the C register guarantee
+ * that the new buffer byte can't be 0xFF here
+ * (see page 160 in the P&M JPEG book). */
+ e->buffer = temp & 0xFF; /* new output byte, might overflow later */
} else if (temp == 0xFF) {
- ++e->sc; /* stack 0xFF byte (which might overflow later) */
+ ++e->sc; /* stack 0xFF byte (which might overflow later) */
} else {
- /* Output all stacked 0xFF bytes, they will not overflow any more */
- if (e->buffer == 0)
- ++e->zc;
- else if (e->buffer >= 0) {
- if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
- emit_byte(e->buffer, cinfo);
- }
- if (e->sc) {
- if (e->zc)
- do emit_byte(0x00, cinfo);
- while (--e->zc);
- do {
- emit_byte(0xFF, cinfo);
- emit_byte(0x00, cinfo);
- } while (--e->sc);
- }
- e->buffer = temp & 0xFF; /* new output byte (can still overflow) */
+ /* Output all stacked 0xFF bytes, they will not overflow any more */
+ if (e->buffer == 0)
+ ++e->zc;
+ else if (e->buffer >= 0) {
+ if (e->zc)
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
+ emit_byte(e->buffer, cinfo);
+ }
+ if (e->sc) {
+ if (e->zc)
+ do emit_byte(0x00, cinfo);
+ while (--e->zc);
+ do {
+ emit_byte(0xFF, cinfo);
+ emit_byte(0x00, cinfo);
+ } while (--e->sc);
+ }
+ e->buffer = temp & 0xFF; /* new output byte (can still overflow) */
}
e->c &= 0x7FFFFL;
e->ct += 8;
@@ -320,7 +323,7 @@ emit_restart (j_compress_ptr cinfo, int restart_num)
{
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
int ci;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
finish_pass(cinfo);
@@ -398,45 +401,45 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Figure F.4: Encode_DC_DIFF */
if ((v = m - entropy->last_dc_val[ci]) == 0) {
arith_encode(cinfo, st, 0);
- entropy->dc_context[ci] = 0; /* zero diff category */
+ entropy->dc_context[ci] = 0; /* zero diff category */
} else {
entropy->last_dc_val[ci] = m;
arith_encode(cinfo, st, 1);
/* Figure F.6: Encoding nonzero value v */
/* Figure F.7: Encoding the sign of v */
if (v > 0) {
- arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
- st += 2; /* Table F.4: SP = S0 + 2 */
- entropy->dc_context[ci] = 4; /* small positive diff category */
+ arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
+ st += 2; /* Table F.4: SP = S0 + 2 */
+ entropy->dc_context[ci] = 4; /* small positive diff category */
} else {
- v = -v;
- arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
- st += 3; /* Table F.4: SN = S0 + 3 */
- entropy->dc_context[ci] = 8; /* small negative diff category */
+ v = -v;
+ arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
+ st += 3; /* Table F.4: SN = S0 + 3 */
+ entropy->dc_context[ci] = 8; /* small negative diff category */
}
/* Figure F.8: Encoding the magnitude category of v */
m = 0;
if (v -= 1) {
- arith_encode(cinfo, st, 1);
- m = 1;
- v2 = v;
- st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
- while (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st += 1;
- }
+ arith_encode(cinfo, st, 1);
+ m = 1;
+ v2 = v;
+ st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
+ while (v2 >>= 1) {
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st += 1;
+ }
}
arith_encode(cinfo, st, 0);
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
- entropy->dc_context[ci] = 0; /* zero diff category */
+ entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
- entropy->dc_context[ci] += 8; /* large diff category */
+ entropy->dc_context[ci] += 8; /* large diff category */
/* Figure F.9: Encoding the magnitude bit pattern of v */
st += 14;
while (m >>= 1)
- arith_encode(cinfo, st, (m & v) ? 1 : 0);
+ arith_encode(cinfo, st, (m & v) ? 1 : 0);
}
}
@@ -491,21 +494,21 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Figure F.5: Encode_AC_Coefficients */
for (k = cinfo->Ss; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
- arith_encode(cinfo, st, 0); /* EOB decision */
+ arith_encode(cinfo, st, 0); /* EOB decision */
for (;;) {
if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
- if (v >>= cinfo->Al) {
- arith_encode(cinfo, st + 1, 1);
- arith_encode(cinfo, entropy->fixed_bin, 0);
- break;
- }
+ if (v >>= cinfo->Al) {
+ arith_encode(cinfo, st + 1, 1);
+ arith_encode(cinfo, entropy->fixed_bin, 0);
+ break;
+ }
} else {
- v = -v;
- if (v >>= cinfo->Al) {
- arith_encode(cinfo, st + 1, 1);
- arith_encode(cinfo, entropy->fixed_bin, 1);
- break;
- }
+ v = -v;
+ if (v >>= cinfo->Al) {
+ arith_encode(cinfo, st + 1, 1);
+ arith_encode(cinfo, entropy->fixed_bin, 1);
+ break;
+ }
}
arith_encode(cinfo, st + 1, 0); st += 3; k++;
}
@@ -517,15 +520,15 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
m = 1;
v2 = v;
if (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st = entropy->ac_stats[tbl] +
- (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
- while (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st += 1;
- }
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st = entropy->ac_stats[tbl] +
+ (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+ while (v2 >>= 1) {
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st += 1;
+ }
}
}
arith_encode(cinfo, st, 0);
@@ -566,7 +569,7 @@ encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
entropy->restarts_to_go--;
}
- st = entropy->fixed_bin; /* use fixed probability estimation */
+ st = entropy->fixed_bin; /* use fixed probability estimation */
Al = cinfo->Al;
/* Encode the MCU data blocks */
@@ -635,29 +638,29 @@ encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
for (k = cinfo->Ss; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
if (k > kex)
- arith_encode(cinfo, st, 0); /* EOB decision */
+ arith_encode(cinfo, st, 0); /* EOB decision */
for (;;) {
if ((v = (*block)[jpeg_natural_order[k]]) >= 0) {
- if (v >>= cinfo->Al) {
- if (v >> 1) /* previously nonzero coef */
- arith_encode(cinfo, st + 2, (v & 1));
- else { /* newly nonzero coef */
- arith_encode(cinfo, st + 1, 1);
- arith_encode(cinfo, entropy->fixed_bin, 0);
- }
- break;
- }
+ if (v >>= cinfo->Al) {
+ if (v >> 1) /* previously nonzero coef */
+ arith_encode(cinfo, st + 2, (v & 1));
+ else { /* newly nonzero coef */
+ arith_encode(cinfo, st + 1, 1);
+ arith_encode(cinfo, entropy->fixed_bin, 0);
+ }
+ break;
+ }
} else {
- v = -v;
- if (v >>= cinfo->Al) {
- if (v >> 1) /* previously nonzero coef */
- arith_encode(cinfo, st + 2, (v & 1));
- else { /* newly nonzero coef */
- arith_encode(cinfo, st + 1, 1);
- arith_encode(cinfo, entropy->fixed_bin, 1);
- }
- break;
- }
+ v = -v;
+ if (v >>= cinfo->Al) {
+ if (v >> 1) /* previously nonzero coef */
+ arith_encode(cinfo, st + 2, (v & 1));
+ else { /* newly nonzero coef */
+ arith_encode(cinfo, st + 1, 1);
+ arith_encode(cinfo, entropy->fixed_bin, 1);
+ }
+ break;
+ }
}
arith_encode(cinfo, st + 1, 0); st += 3; k++;
}
@@ -680,7 +683,7 @@ METHODDEF(boolean)
encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
{
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
JBLOCKROW block;
unsigned char *st;
int blkn, ci, tbl, k, ke;
@@ -713,45 +716,45 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Figure F.4: Encode_DC_DIFF */
if ((v = (*block)[0] - entropy->last_dc_val[ci]) == 0) {
arith_encode(cinfo, st, 0);
- entropy->dc_context[ci] = 0; /* zero diff category */
+ entropy->dc_context[ci] = 0; /* zero diff category */
} else {
entropy->last_dc_val[ci] = (*block)[0];
arith_encode(cinfo, st, 1);
/* Figure F.6: Encoding nonzero value v */
/* Figure F.7: Encoding the sign of v */
if (v > 0) {
- arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
- st += 2; /* Table F.4: SP = S0 + 2 */
- entropy->dc_context[ci] = 4; /* small positive diff category */
+ arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
+ st += 2; /* Table F.4: SP = S0 + 2 */
+ entropy->dc_context[ci] = 4; /* small positive diff category */
} else {
- v = -v;
- arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
- st += 3; /* Table F.4: SN = S0 + 3 */
- entropy->dc_context[ci] = 8; /* small negative diff category */
+ v = -v;
+ arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
+ st += 3; /* Table F.4: SN = S0 + 3 */
+ entropy->dc_context[ci] = 8; /* small negative diff category */
}
/* Figure F.8: Encoding the magnitude category of v */
m = 0;
if (v -= 1) {
- arith_encode(cinfo, st, 1);
- m = 1;
- v2 = v;
- st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
- while (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st += 1;
- }
+ arith_encode(cinfo, st, 1);
+ m = 1;
+ v2 = v;
+ st = entropy->dc_stats[tbl] + 20; /* Table F.4: X1 = 20 */
+ while (v2 >>= 1) {
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st += 1;
+ }
}
arith_encode(cinfo, st, 0);
/* Section F.1.4.4.1.2: Establish dc_context conditioning category */
if (m < (int) ((1L << cinfo->arith_dc_L[tbl]) >> 1))
- entropy->dc_context[ci] = 0; /* zero diff category */
+ entropy->dc_context[ci] = 0; /* zero diff category */
else if (m > (int) ((1L << cinfo->arith_dc_U[tbl]) >> 1))
- entropy->dc_context[ci] += 8; /* large diff category */
+ entropy->dc_context[ci] += 8; /* large diff category */
/* Figure F.9: Encoding the magnitude bit pattern of v */
st += 14;
while (m >>= 1)
- arith_encode(cinfo, st, (m & v) ? 1 : 0);
+ arith_encode(cinfo, st, (m & v) ? 1 : 0);
}
/* Sections F.1.4.2 & F.1.4.4.2: Encoding of AC coefficients */
@@ -765,43 +768,43 @@ encode_mcu (j_compress_ptr cinfo, JBLOCKROW *MCU_data)
/* Figure F.5: Encode_AC_Coefficients */
for (k = 1; k <= ke; k++) {
st = entropy->ac_stats[tbl] + 3 * (k - 1);
- arith_encode(cinfo, st, 0); /* EOB decision */
+ arith_encode(cinfo, st, 0); /* EOB decision */
while ((v = (*block)[jpeg_natural_order[k]]) == 0) {
- arith_encode(cinfo, st + 1, 0); st += 3; k++;
+ arith_encode(cinfo, st + 1, 0); st += 3; k++;
}
arith_encode(cinfo, st + 1, 1);
/* Figure F.6: Encoding nonzero value v */
/* Figure F.7: Encoding the sign of v */
if (v > 0) {
- arith_encode(cinfo, entropy->fixed_bin, 0);
+ arith_encode(cinfo, entropy->fixed_bin, 0);
} else {
- v = -v;
- arith_encode(cinfo, entropy->fixed_bin, 1);
+ v = -v;
+ arith_encode(cinfo, entropy->fixed_bin, 1);
}
st += 2;
/* Figure F.8: Encoding the magnitude category of v */
m = 0;
if (v -= 1) {
- arith_encode(cinfo, st, 1);
- m = 1;
- v2 = v;
- if (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st = entropy->ac_stats[tbl] +
- (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
- while (v2 >>= 1) {
- arith_encode(cinfo, st, 1);
- m <<= 1;
- st += 1;
- }
- }
+ arith_encode(cinfo, st, 1);
+ m = 1;
+ v2 = v;
+ if (v2 >>= 1) {
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st = entropy->ac_stats[tbl] +
+ (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
+ while (v2 >>= 1) {
+ arith_encode(cinfo, st, 1);
+ m <<= 1;
+ st += 1;
+ }
+ }
}
arith_encode(cinfo, st, 0);
/* Figure F.9: Encoding the magnitude bit pattern of v */
st += 14;
while (m >>= 1)
- arith_encode(cinfo, st, (m & v) ? 1 : 0);
+ arith_encode(cinfo, st, (m & v) ? 1 : 0);
}
/* Encode EOB decision only if k <= DCTSIZE2 - 1 */
if (k <= DCTSIZE2 - 1) {
@@ -823,7 +826,7 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
{
arith_entropy_ptr entropy = (arith_entropy_ptr) cinfo->entropy;
int ci, tbl;
- jpeg_component_info * compptr;
+ jpeg_component_info *compptr;
if (gather_statistics)
/* Make sure to avoid that in the master control logic!
@@ -838,14 +841,14 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
if (cinfo->progressive_mode) {
if (cinfo->Ah == 0) {
if (cinfo->Ss == 0)
- entropy->pub.encode_mcu = encode_mcu_DC_first;
+ entropy->pub.encode_mcu = encode_mcu_DC_first;
else
- entropy->pub.encode_mcu = encode_mcu_AC_first;
+ entropy->pub.encode_mcu = encode_mcu_AC_first;
} else {
if (cinfo->Ss == 0)
- entropy->pub.encode_mcu = encode_mcu_DC_refine;
+ entropy->pub.encode_mcu = encode_mcu_DC_refine;
else
- entropy->pub.encode_mcu = encode_mcu_AC_refine;
+ entropy->pub.encode_mcu = encode_mcu_AC_refine;
}
} else
entropy->pub.encode_mcu = encode_mcu;
@@ -857,10 +860,10 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
tbl = compptr->dc_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
- ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+ ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
if (entropy->dc_stats[tbl] == NULL)
- entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
- ((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
+ entropy->dc_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+ ((j_common_ptr) cinfo, JPOOL_IMAGE, DC_STAT_BINS);
MEMZERO(entropy->dc_stats[tbl], DC_STAT_BINS);
/* Initialize DC predictions to 0 */
entropy->last_dc_val[ci] = 0;
@@ -870,15 +873,15 @@ start_pass (j_compress_ptr cinfo, boolean gather_statistics)
if (cinfo->progressive_mode == 0 || cinfo->Se) {
tbl = compptr->ac_tbl_no;
if (tbl < 0 || tbl >= NUM_ARITH_TBLS)
- ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
+ ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
if (entropy->ac_stats[tbl] == NULL)
- entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
- ((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
+ entropy->ac_stats[tbl] = (unsigned char *) (*cinfo->mem->alloc_small)
+ ((j_common_ptr) cinfo, JPOOL_IMAGE, AC_STAT_BINS);
MEMZERO(entropy->ac_stats[tbl], AC_STAT_BINS);
#ifdef CALCULATE_SPECTRAL_CONDITIONING
if (cinfo->progressive_mode)
- /* Section G.1.3.2: Set appropriate arithmetic conditioning value Kx */
- cinfo->arith_ac_K[tbl] = cinfo->Ss + ((8 + cinfo->Se - cinfo->Ss) >> 4);
+ /* Section G.1.3.2: Set appropriate arithmetic conditioning value Kx */
+ cinfo->arith_ac_K[tbl] = cinfo->Ss + ((8 + cinfo->Se - cinfo->Ss) >> 4);
#endif
}
}
@@ -909,7 +912,7 @@ jinit_arith_encoder (j_compress_ptr cinfo)
entropy = (arith_entropy_ptr)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(arith_entropy_encoder));
+ sizeof(arith_entropy_encoder));
cinfo->entropy = (struct jpeg_entropy_encoder *) entropy;
entropy->pub.start_pass = start_pass;
entropy->pub.finish_pass = finish_pass;
« .gitignore ('K') | « jcapistd.c ('k') | jccoefct.c » ('j') | jconfig.h » ('J')

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