diff options
author | 2017-01-25 17:49:53 +0100 | |
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committer | 2017-01-25 17:49:53 +0100 | |
commit | 78a7342750182687a08060c5e060cb897800e9f6 (patch) | |
tree | 73ab5b3a3b09c56a73a74950a71701adf7a22cc7 /3rdparty/libjpeg/jchuff.c | |
parent | 93c92be81517a982ef9b47eed610a3e42ed244bc (diff) |
updated libjpeg to 9c (nw)
Diffstat (limited to '3rdparty/libjpeg/jchuff.c')
-rw-r--r-- | 3rdparty/libjpeg/jchuff.c | 127 |
1 files changed, 62 insertions, 65 deletions
diff --git a/3rdparty/libjpeg/jchuff.c b/3rdparty/libjpeg/jchuff.c index abf27d05e8a..d1313f676f6 100644 --- a/3rdparty/libjpeg/jchuff.c +++ b/3rdparty/libjpeg/jchuff.c @@ -2,7 +2,7 @@ * jchuff.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. * @@ -302,30 +302,33 @@ dump_buffer_e (huff_entropy_ptr entropy) * between calls, so 24 bits are sufficient. */ -/*INLINE*/ +INLINE LOCAL(boolean) emit_bits_s (working_state * state, unsigned int code, int size) /* Emit some bits; return TRUE if successful, FALSE if must suspend */ { /* This routine is heavily used, so it's worth coding tightly. */ - register INT32 put_buffer = (INT32) code; - register int put_bits = state->cur.put_bits; + register INT32 put_buffer; + register int put_bits; /* if size is 0, caller used an invalid Huffman table entry */ if (size == 0) ERREXIT(state->cinfo, JERR_HUFF_MISSING_CODE); - put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */ - - put_bits += size; /* new number of bits in buffer */ - + /* mask off any extra bits in code */ + put_buffer = ((INT32) code) & ((((INT32) 1) << size) - 1); + + /* new number of bits in buffer */ + put_bits = size + state->cur.put_bits; + put_buffer <<= 24 - put_bits; /* align incoming bits */ - put_buffer |= state->cur.put_buffer; /* and merge with old buffer contents */ - + /* and merge with old buffer contents */ + put_buffer |= state->cur.put_buffer; + while (put_bits >= 8) { int c = (int) ((put_buffer >> 16) & 0xFF); - + emit_byte_s(state, c, return FALSE); if (c == 0xFF) { /* need to stuff a zero byte? */ emit_byte_s(state, 0, return FALSE); @@ -341,14 +344,14 @@ emit_bits_s (working_state * state, unsigned int code, int size) } -/*INLINE*/ +INLINE LOCAL(void) emit_bits_e (huff_entropy_ptr entropy, unsigned int code, int size) /* Emit some bits, unless we are in gather mode */ { /* This routine is heavily used, so it's worth coding tightly. */ - register INT32 put_buffer = (INT32) code; - register int put_bits = entropy->saved.put_bits; + register INT32 put_buffer; + register int put_bits; /* if size is 0, caller used an invalid Huffman table entry */ if (size == 0) @@ -357,9 +360,11 @@ emit_bits_e (huff_entropy_ptr entropy, unsigned int code, int size) if (entropy->gather_statistics) return; /* do nothing if we're only getting stats */ - put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */ - - put_bits += size; /* new number of bits in buffer */ + /* mask off any extra bits in code */ + put_buffer = ((INT32) code) & ((((INT32) 1) << size) - 1); + + /* new number of bits in buffer */ + put_bits = size + entropy->saved.put_bits; put_buffer <<= 24 - put_bits; /* align incoming bits */ @@ -406,7 +411,7 @@ flush_bits_e (huff_entropy_ptr entropy) * Emit (or just count) a Huffman symbol. */ -/*INLINE*/ +INLINE LOCAL(void) emit_dc_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol) { @@ -419,7 +424,7 @@ emit_dc_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol) } -/*INLINE*/ +INLINE LOCAL(void) emit_ac_symbol (huff_entropy_ptr entropy, int tbl_no, int symbol) { @@ -543,10 +548,7 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy; register int temp, temp2; register int nbits; - int blkn, ci; - int Al = cinfo->Al; - JBLOCKROW block; - jpeg_component_info * compptr; + int blkn, ci, tbl; ISHIFT_TEMPS entropy->next_output_byte = cinfo->dest->next_output_byte; @@ -559,28 +561,27 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) /* Encode the MCU data blocks */ for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { - block = MCU_data[blkn]; ci = cinfo->MCU_membership[blkn]; - compptr = cinfo->cur_comp_info[ci]; + tbl = cinfo->cur_comp_info[ci]->dc_tbl_no; /* Compute the DC value after the required point transform by Al. * This is simply an arithmetic right shift. */ - temp2 = IRIGHT_SHIFT((int) ((*block)[0]), Al); + temp = IRIGHT_SHIFT((int) (MCU_data[blkn][0][0]), cinfo->Al); /* DC differences are figured on the point-transformed values. */ - temp = temp2 - entropy->saved.last_dc_val[ci]; - entropy->saved.last_dc_val[ci] = temp2; + temp2 = temp - entropy->saved.last_dc_val[ci]; + entropy->saved.last_dc_val[ci] = temp; /* Encode the DC coefficient difference per section G.1.2.1 */ - temp2 = temp; + temp = temp2; if (temp < 0) { temp = -temp; /* temp is abs value of input */ /* For a negative input, want temp2 = bitwise complement of abs(input) */ /* This code assumes we are on a two's complement machine */ temp2--; } - + /* Find the number of bits needed for the magnitude of the coefficient */ nbits = 0; while (temp) { @@ -592,10 +593,10 @@ encode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) */ if (nbits > MAX_COEF_BITS+1) ERREXIT(cinfo, JERR_BAD_DCT_COEF); - + /* Count/emit the Huffman-coded symbol for the number of bits */ - emit_dc_symbol(entropy, compptr->dc_tbl_no, nbits); - + emit_dc_symbol(entropy, tbl, nbits); + /* Emit that number of bits of the value, if positive, */ /* or the complement of its magnitude, if negative. */ if (nbits) /* emit_bits rejects calls with size 0 */ @@ -628,12 +629,12 @@ METHODDEF(boolean) encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) { huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy; + const int * natural_order; + JBLOCKROW block; register int temp, temp2; register int nbits; register int r, k; int Se, Al; - const int * natural_order; - JBLOCKROW block; entropy->next_output_byte = cinfo->dest->next_output_byte; entropy->free_in_buffer = cinfo->dest->free_in_buffer; @@ -731,18 +732,15 @@ encode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) /* * MCU encoding 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) encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) { huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy; - register int temp; - int blkn; - int Al = cinfo->Al; - JBLOCKROW block; + int Al, blkn; entropy->next_output_byte = cinfo->dest->next_output_byte; entropy->free_in_buffer = cinfo->dest->free_in_buffer; @@ -752,13 +750,12 @@ encode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) if (entropy->restarts_to_go == 0) emit_restart_e(entropy, entropy->next_restart_num); + Al = cinfo->Al; + /* Encode the MCU data blocks */ for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { - block = MCU_data[blkn]; - /* We simply emit the Al'th bit of the DC coefficient value. */ - temp = (*block)[0]; - emit_bits_e(entropy, (unsigned int) (temp >> Al), 1); + emit_bits_e(entropy, (unsigned int) (MCU_data[blkn][0][0] >> Al), 1); } cinfo->dest->next_output_byte = entropy->next_output_byte; @@ -786,14 +783,14 @@ METHODDEF(boolean) encode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) { huff_entropy_ptr entropy = (huff_entropy_ptr) cinfo->entropy; + const int * natural_order; + JBLOCKROW block; register int temp; register int r, k; + int Se, Al; int EOB; char *BR_buffer; unsigned int BR; - int Se, Al; - const int * natural_order; - JBLOCKROW block; int absvalues[DCTSIZE2]; entropy->next_output_byte = cinfo->dest->next_output_byte; @@ -918,7 +915,7 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val, { register int temp, temp2; register int nbits; - register int k, r, i; + register int r, k; int Se = state->cinfo->lim_Se; const int * natural_order = state->cinfo->natural_order; @@ -960,7 +957,7 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val, r = 0; /* r = run length of zeros */ for (k = 1; k <= Se; k++) { - if ((temp = block[natural_order[k]]) == 0) { + if ((temp2 = block[natural_order[k]]) == 0) { r++; } else { /* if run length > 15, must emit special run-length-16 codes (0xF0) */ @@ -970,7 +967,7 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val, r -= 16; } - temp2 = temp; + temp = temp2; if (temp < 0) { temp = -temp; /* temp is abs value of input */ /* This code assumes we are on a two's complement machine */ @@ -986,8 +983,8 @@ encode_one_block (working_state * state, JCOEFPTR block, int last_dc_val, ERREXIT(state->cinfo, JERR_BAD_DCT_COEF); /* Emit Huffman symbol for run length / number of bits */ - i = (r << 4) + nbits; - if (! emit_bits_s(state, actbl->ehufco[i], actbl->ehufsi[i])) + temp = (r << 4) + nbits; + if (! emit_bits_s(state, actbl->ehufco[temp], actbl->ehufsi[temp])) return FALSE; /* Emit that number of bits of the value, if positive, */ @@ -1124,16 +1121,16 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val, { register int temp; register int nbits; - register int k, r; + register int r, k; int Se = cinfo->lim_Se; const int * natural_order = cinfo->natural_order; - + /* 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) { @@ -1148,11 +1145,11 @@ 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 */ - + for (k = 1; k <= Se; k++) { if ((temp = block[natural_order[k]]) == 0) { r++; @@ -1162,11 +1159,11 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val, ac_counts[0xF0]++; r -= 16; } - + /* Find the number of bits needed for the magnitude of the coefficient */ if (temp < 0) temp = -temp; - + /* Find the number of bits needed for the magnitude of the coefficient */ nbits = 1; /* there must be at least one 1 bit */ while ((temp >>= 1)) @@ -1174,10 +1171,10 @@ htest_one_block (j_compress_ptr cinfo, JCOEFPTR block, int last_dc_val, /* Check for out-of-range coefficient values */ if (nbits > MAX_COEF_BITS) ERREXIT(cinfo, JERR_BAD_DCT_COEF); - + /* Count Huffman symbol for run length / number of bits */ ac_counts[(r << 4) + nbits]++; - + r = 0; } } @@ -1562,7 +1559,7 @@ 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)); - cinfo->entropy = (struct jpeg_entropy_encoder *) entropy; + cinfo->entropy = &entropy->pub; entropy->pub.start_pass = start_pass_huff; /* Mark tables unallocated */ |