170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jcphuff.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1995-1997, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains Huffman entropy encoding routines for progressive JPEG. 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We do not support output suspension in this module, since the library 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * currently does not allow multiple-scan files to be written with output 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * suspension. 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jchuff.h" /* Declarations shared with jchuff.c */ 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef C_PROGRESSIVE_SUPPORTED 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Expanded entropy encoder object for progressive Huffman encoding. */ 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef struct { 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine struct jpeg_entropy_encoder pub; /* public fields */ 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Mode flag: TRUE for optimization, FALSE for actual data output */ 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine boolean gather_statistics; 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Bit-level coding status. 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * next_output_byte/free_in_buffer are local copies of cinfo->dest fields. 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JOCTET * next_output_byte; /* => next byte to write in buffer */ 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine INT32 put_buffer; /* current bit-accumulation buffer */ 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int put_bits; /* # of bits now in it */ 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine j_compress_ptr cinfo; /* link to cinfo (needed for dump_buffer) */ 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Coding status for DC components */ 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */ 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Coding status for AC components */ 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ac_tbl_no; /* the table number of the single component */ 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine unsigned int EOBRUN; /* run length of EOBs */ 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine unsigned int BE; /* # of buffered correction bits before MCU */ 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine char * bit_buffer; /* buffer for correction bits (1 per char) */ 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* packing correction bits tightly would save some space but cost time... */ 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine unsigned int restarts_to_go; /* MCUs left in this restart interval */ 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int next_restart_num; /* next restart number to write (0-7) */ 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Pointers to derived tables (these workspaces have image lifespan). 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Since any one scan codes only DC or only AC, we only need one set 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * of tables, not one for DC and one for AC. 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine c_derived_tbl * derived_tbls[NUM_HUFF_TBLS]; 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Statistics tables for optimization; again, one set is enough */ 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine long * count_ptrs[NUM_HUFF_TBLS]; 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} phuff_entropy_encoder; 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef phuff_entropy_encoder * phuff_entropy_ptr; 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* MAX_CORR_BITS is the number of bits the AC refinement correction-bit 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * buffer can hold. Larger sizes may slightly improve compression, but 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1000 is already well into the realm of overkill. 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The minimum safe size is 64 bits. 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define MAX_CORR_BITS 1000 /* Max # of correction bits I can buffer */ 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32. 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We assume that int right shift is unsigned if INT32 right shift is, 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * which should be safe. 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef RIGHT_SHIFT_IS_UNSIGNED 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define ISHIFT_TEMPS int ishift_temp; 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define IRIGHT_SHIFT(x,shft) \ 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ((ishift_temp = (x)) < 0 ? \ 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \ 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (ishift_temp >> (shft))) 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define ISHIFT_TEMPS 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define IRIGHT_SHIFT(x,shft) ((x) >> (shft)) 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Forward declarations */ 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) encode_mcu_DC_first JPP((j_compress_ptr cinfo, 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW *MCU_data)); 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) encode_mcu_AC_first JPP((j_compress_ptr cinfo, 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW *MCU_data)); 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) encode_mcu_DC_refine JPP((j_compress_ptr cinfo, 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW *MCU_data)); 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) encode_mcu_AC_refine JPP((j_compress_ptr cinfo, 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW *MCU_data)); 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) finish_pass_phuff JPP((j_compress_ptr cinfo)); 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) finish_pass_gather_phuff JPP((j_compress_ptr cinfo)); 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize for a Huffman-compressed scan using progressive JPEG. 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinestart_pass_phuff (j_compress_ptr cinfo, boolean gather_statistics) 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine boolean is_DC_band; 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci, tbl; 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info * compptr; 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->cinfo = cinfo; 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->gather_statistics = gather_statistics; 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine is_DC_band = (cinfo->Ss == 0); 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We assume jcmaster.c already validated the scan parameters. */ 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Select execution routines */ 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->Ah == 0) { 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (is_DC_band) 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.encode_mcu = encode_mcu_DC_first; 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.encode_mcu = encode_mcu_AC_first; 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (is_DC_band) 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.encode_mcu = encode_mcu_DC_refine; 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else { 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.encode_mcu = encode_mcu_AC_refine; 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* AC refinement needs a correction bit buffer */ 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->bit_buffer == NULL) 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->bit_buffer = (char *) 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MAX_CORR_BITS * SIZEOF(char)); 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (gather_statistics) 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.finish_pass = finish_pass_gather_phuff; 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.finish_pass = finish_pass_phuff; 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Only DC coefficients may be interleaved, so cinfo->comps_in_scan = 1 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * for AC coefficients. 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize DC predictions to 0 */ 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->last_dc_val[ci] = 0; 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Get table index */ 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (is_DC_band) { 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->Ah != 0) /* DC refinement needs no table */ 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl = compptr->dc_tbl_no; 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->ac_tbl_no = tbl = compptr->ac_tbl_no; 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (gather_statistics) { 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check for invalid table index */ 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* (make_c_derived_tbl does this in the other path) */ 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tbl < 0 || tbl >= NUM_HUFF_TBLS) 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl); 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Allocate and zero the statistics tables */ 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Note that jpeg_gen_optimal_table expects 257 entries in each table! */ 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->count_ptrs[tbl] == NULL) 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->count_ptrs[tbl] = (long *) 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 257 * SIZEOF(long)); 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MEMZERO(entropy->count_ptrs[tbl], 257 * SIZEOF(long)); 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Compute derived values for Huffman table */ 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We may do this more than once for a table, but it's not expensive */ 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_make_c_derived_tbl(cinfo, is_DC_band, tbl, 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine & entropy->derived_tbls[tbl]); 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize AC stuff */ 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->EOBRUN = 0; 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->BE = 0; 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize bit buffer to empty */ 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_buffer = 0; 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_bits = 0; 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize restart stuff */ 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go = cinfo->restart_interval; 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num = 0; 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Outputting bytes to the file. 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * NB: these must be called only when actually outputting, 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * that is, entropy->gather_statistics == FALSE. 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Emit a byte */ 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define emit_byte(entropy,val) \ 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine { *(entropy)->next_output_byte++ = (JOCTET) (val); \ 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (--(entropy)->free_in_buffer == 0) \ 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dump_buffer(entropy); } 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinedump_buffer (phuff_entropy_ptr entropy) 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Empty the output buffer; we do not support suspension in this module. */ 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine struct jpeg_destination_mgr * dest = entropy->cinfo->dest; 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (! (*dest->empty_output_buffer) (entropy->cinfo)) 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(entropy->cinfo, JERR_CANT_SUSPEND); 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* After a successful buffer dump, must reset buffer pointers */ 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = dest->next_output_byte; 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = dest->free_in_buffer; 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Outputting bits to the file */ 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Only the right 24 bits of put_buffer are used; the valid bits are 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * left-justified in this part. At most 16 bits can be passed to emit_bits 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * in one call, and we never retain more than 7 bits in put_buffer 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * between calls, so 24 bits are sufficient. 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineINLINE 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineemit_bits (phuff_entropy_ptr entropy, unsigned int code, int size) 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Emit some bits, unless we are in gather mode */ 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* This routine is heavily used, so it's worth coding tightly. */ 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register INT32 put_buffer = (INT32) code; 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int put_bits = entropy->put_bits; 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* if size is 0, caller used an invalid Huffman table entry */ 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (size == 0) 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE); 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->gather_statistics) 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return; /* do nothing if we're only getting stats */ 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */ 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_bits += size; /* new number of bits in buffer */ 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_buffer <<= 24 - put_bits; /* align incoming bits */ 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_buffer |= entropy->put_buffer; /* and merge with old buffer contents */ 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (put_bits >= 8) { 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int c = (int) ((put_buffer >> 16) & 0xFF); 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_byte(entropy, c); 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (c == 0xFF) { /* need to stuff a zero byte? */ 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_byte(entropy, 0); 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_buffer <<= 8; 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine put_bits -= 8; 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_buffer = put_buffer; /* update variables */ 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_bits = put_bits; 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineflush_bits (phuff_entropy_ptr entropy) 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, 0x7F, 7); /* fill any partial byte with ones */ 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_buffer = 0; /* and reset bit-buffer to empty */ 27170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->put_bits = 0; 27270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 27370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 27670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Emit (or just count) a Huffman symbol. 27770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 27870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineINLINE 28070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 28170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineemit_symbol (phuff_entropy_ptr entropy, int tbl_no, int symbol) 28270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 28370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->gather_statistics) 28470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->count_ptrs[tbl_no][symbol]++; 28570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else { 28670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine c_derived_tbl * tbl = entropy->derived_tbls[tbl_no]; 28770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]); 28870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 28970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 29070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 29370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Emit bits from a correction bit buffer. 29470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 29570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 29770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineemit_buffered_bits (phuff_entropy_ptr entropy, char * bufstart, 29870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine unsigned int nbits) 29970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 30070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->gather_statistics) 30170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return; /* no real work */ 30270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 30370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (nbits > 0) { 30470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, (unsigned int) (*bufstart), 1); 30570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine bufstart++; 30670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits--; 30770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 30870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 30970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 31270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Emit any pending EOBRUN symbol. 31370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 31470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 31570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 31670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineemit_eobrun (phuff_entropy_ptr entropy) 31770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 31870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int temp, nbits; 31970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->EOBRUN > 0) { /* if there is any pending EOBRUN */ 32170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = entropy->EOBRUN; 32270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits = 0; 32370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while ((temp >>= 1)) 32470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits++; 32570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* safety check: shouldn't happen given limited correction-bit buffer */ 32670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (nbits > 14) 32770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE); 32870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 32970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, entropy->ac_tbl_no, nbits << 4); 33070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (nbits) 33170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, entropy->EOBRUN, nbits); 33270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 33370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->EOBRUN = 0; 33470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 33570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit any buffered correction bits */ 33670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_buffered_bits(entropy, entropy->bit_buffer, entropy->BE); 33770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->BE = 0; 33870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 33970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 34070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 34170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 34270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 34370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Emit a restart marker & resynchronize predictions. 34470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 34570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 34670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 34770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineemit_restart (phuff_entropy_ptr entropy, int restart_num) 34870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 34970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci; 35070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 35270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (! entropy->gather_statistics) { 35470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine flush_bits(entropy); 35570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_byte(entropy, 0xFF); 35670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_byte(entropy, JPEG_RST0 + restart_num); 35770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 35870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->cinfo->Ss == 0) { 36070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Re-initialize DC predictions to 0 */ 36170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < entropy->cinfo->comps_in_scan; ci++) 36270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->last_dc_val[ci] = 0; 36370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 36470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Re-initialize all AC-related fields to 0 */ 36570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->EOBRUN = 0; 36670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->BE = 0; 36770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 36870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 36970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 37270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * MCU encoding for DC initial scan (either spectral selection, 37370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * or first pass of successive approximation). 37470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 37570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) 37770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineencode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 37870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 37970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 38070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int temp, temp2; 38170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int nbits; 38270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int blkn, ci; 38370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Al = cinfo->Al; 38470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW block; 38570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info * compptr; 38670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ISHIFT_TEMPS 38770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = cinfo->dest->next_output_byte; 38970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = cinfo->dest->free_in_buffer; 39070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 39170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit restart marker if needed */ 39270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) 39370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) 39470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_restart(entropy, entropy->next_restart_num); 39570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 39670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the MCU data blocks */ 39770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { 39870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine block = MCU_data[blkn]; 39970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ci = cinfo->MCU_membership[blkn]; 40070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 40170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 40270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Compute the DC value after the required point transform by Al. 40370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This is simply an arithmetic right shift. 40470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 40570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp2 = IRIGHT_SHIFT((int) ((*block)[0]), Al); 40670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 40770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* DC differences are figured on the point-transformed values. */ 40870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = temp2 - entropy->last_dc_val[ci]; 40970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->last_dc_val[ci] = temp2; 41070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 41170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the DC coefficient difference per section G.1.2.1 */ 41270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp2 = temp; 41370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp < 0) { 41470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = -temp; /* temp is abs value of input */ 41570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For a negative input, want temp2 = bitwise complement of abs(input) */ 41670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* This code assumes we are on a two's complement machine */ 41770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp2--; 41870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 41970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 42070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Find the number of bits needed for the magnitude of the coefficient */ 42170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits = 0; 42270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (temp) { 42370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits++; 42470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp >>= 1; 42570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 42670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check for out-of-range coefficient values. 42770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Since we're encoding a difference, the range limit is twice as much. 42870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 42970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (nbits > MAX_COEF_BITS+1) 43070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_BAD_DCT_COEF); 43170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 43270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Count/emit the Huffman-coded symbol for the number of bits */ 43370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, compptr->dc_tbl_no, nbits); 43470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 43570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit that number of bits of the value, if positive, */ 43670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* or the complement of its magnitude, if negative. */ 43770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (nbits) /* emit_bits rejects calls with size 0 */ 43870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, (unsigned int) temp2, nbits); 43970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 44070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 44170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->next_output_byte = entropy->next_output_byte; 44270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->free_in_buffer = entropy->free_in_buffer; 44370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 44470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Update restart-interval state too */ 44570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) { 44670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) { 44770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go = cinfo->restart_interval; 44870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num++; 44970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num &= 7; 45070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 45170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go--; 45270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 45370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 45470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 45570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 45670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 45770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 45870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 45970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * MCU encoding for AC initial scan (either spectral selection, 46070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * or first pass of successive approximation). 46170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 46270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 46370a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) 46470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineencode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 46570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 46670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 46770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int temp, temp2; 46870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int nbits; 46970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int r, k; 47070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Se = cinfo->Se; 47170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Al = cinfo->Al; 47270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW block; 47370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 47470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = cinfo->dest->next_output_byte; 47570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = cinfo->dest->free_in_buffer; 47670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 47770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit restart marker if needed */ 47870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) 47970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) 48070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_restart(entropy, entropy->next_restart_num); 48170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 48270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the MCU data block */ 48370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine block = MCU_data[0]; 48470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 48570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the AC coefficients per section G.1.2.2, fig. G.3 */ 48670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 48770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r = 0; /* r = run length of zeros */ 48870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 48970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (k = cinfo->Ss; k <= Se; k++) { 49070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((temp = (*block)[jpeg_natural_order[k]]) == 0) { 49170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r++; 49270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 49370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 49470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We must apply the point transform by Al. For AC coefficients this 49570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * is an integer division with rounding towards 0. To do this portably 49670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * in C, we shift after obtaining the absolute value; so the code is 49770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * interwoven with finding the abs value (temp) and output bits (temp2). 49870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 49970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp < 0) { 50070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = -temp; /* temp is abs value of input */ 50170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp >>= Al; /* apply the point transform */ 50270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* For a negative coef, want temp2 = bitwise complement of abs(coef) */ 50370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp2 = ~temp; 50470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 50570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp >>= Al; /* apply the point transform */ 50670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp2 = temp; 50770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 50870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Watch out for case that nonzero coef is zero after point transform */ 50970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp == 0) { 51070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r++; 51170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 51270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 51370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 51470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit any pending EOBRUN */ 51570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->EOBRUN > 0) 51670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 51770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* if run length > 15, must emit special run-length-16 codes (0xF0) */ 51870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (r > 15) { 51970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, entropy->ac_tbl_no, 0xF0); 52070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r -= 16; 52170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 52270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 52370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Find the number of bits needed for the magnitude of the coefficient */ 52470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits = 1; /* there must be at least one 1 bit */ 52570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while ((temp >>= 1)) 52670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine nbits++; 52770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Check for out-of-range coefficient values */ 52870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (nbits > MAX_COEF_BITS) 52970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_BAD_DCT_COEF); 53070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 53170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Count/emit Huffman symbol for run length / number of bits */ 53270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits); 53370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 53470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit that number of bits of the value, if positive, */ 53570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* or the complement of its magnitude, if negative. */ 53670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, (unsigned int) temp2, nbits); 53770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 53870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r = 0; /* reset zero run length */ 53970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 54070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 54170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (r > 0) { /* If there are trailing zeroes, */ 54270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->EOBRUN++; /* count an EOB */ 54370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->EOBRUN == 0x7FFF) 54470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); /* force it out to avoid overflow */ 54570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 54670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 54770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->next_output_byte = entropy->next_output_byte; 54870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->free_in_buffer = entropy->free_in_buffer; 54970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 55070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Update restart-interval state too */ 55170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) { 55270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) { 55370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go = cinfo->restart_interval; 55470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num++; 55570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num &= 7; 55670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 55770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go--; 55870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 55970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 56070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 56170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 56270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 56370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 56470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 56570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * MCU encoding for DC successive approximation refinement scan. 56670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note: we assume such scans can be multi-component, although the spec 56770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * is not very clear on the point. 56870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 56970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 57070a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) 57170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineencode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 57270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 57370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 57470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int temp; 57570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int blkn; 57670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Al = cinfo->Al; 57770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW block; 57870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 57970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = cinfo->dest->next_output_byte; 58070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = cinfo->dest->free_in_buffer; 58170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 58270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit restart marker if needed */ 58370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) 58470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) 58570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_restart(entropy, entropy->next_restart_num); 58670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 58770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the MCU data blocks */ 58870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { 58970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine block = MCU_data[blkn]; 59070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 59170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We simply emit the Al'th bit of the DC coefficient value. */ 59270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = (*block)[0]; 59370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, (unsigned int) (temp >> Al), 1); 59470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 59570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 59670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->next_output_byte = entropy->next_output_byte; 59770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->free_in_buffer = entropy->free_in_buffer; 59870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 59970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Update restart-interval state too */ 60070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) { 60170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) { 60270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go = cinfo->restart_interval; 60370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num++; 60470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num &= 7; 60570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 60670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go--; 60770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 60870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 60970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 61070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 61170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 61270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 61370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 61470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * MCU encoding for AC successive approximation refinement scan. 61570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 61670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 61770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) 61870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkineencode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 61970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 62070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 62170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int temp; 62270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine register int r, k; 62370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int EOB; 62470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine char *BR_buffer; 62570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine unsigned int BR; 62670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Se = cinfo->Se; 62770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int Al = cinfo->Al; 62870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW block; 62970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int absvalues[DCTSIZE2]; 63070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 63170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = cinfo->dest->next_output_byte; 63270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = cinfo->dest->free_in_buffer; 63370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 63470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit restart marker if needed */ 63570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) 63670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) 63770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_restart(entropy, entropy->next_restart_num); 63870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 63970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the MCU data block */ 64070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine block = MCU_data[0]; 64170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 64270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* It is convenient to make a pre-pass to determine the transformed 64370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * coefficients' absolute values and the EOB position. 64470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 64570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine EOB = 0; 64670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (k = cinfo->Ss; k <= Se; k++) { 64770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = (*block)[jpeg_natural_order[k]]; 64870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We must apply the point transform by Al. For AC coefficients this 64970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * is an integer division with rounding towards 0. To do this portably 65070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * in C, we shift after obtaining the absolute value. 65170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 65270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp < 0) 65370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = -temp; /* temp is abs value of input */ 65470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp >>= Al; /* apply the point transform */ 65570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine absvalues[k] = temp; /* save abs value for main pass */ 65670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp == 1) 65770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine EOB = k; /* EOB = index of last newly-nonzero coef */ 65870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 65970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 66070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Encode the AC coefficients per section G.1.2.3, fig. G.7 */ 66170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 66270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r = 0; /* r = run length of zeros */ 66370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR = 0; /* BR = count of buffered bits added now */ 66470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR_buffer = entropy->bit_buffer + entropy->BE; /* Append bits to buffer */ 66570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 66670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (k = cinfo->Ss; k <= Se; k++) { 66770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if ((temp = absvalues[k]) == 0) { 66870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r++; 66970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 67070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 67170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 67270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit any required ZRLs, but not if they can be folded into EOB */ 67370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine while (r > 15 && k <= EOB) { 67470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* emit any pending EOBRUN and the BE correction bits */ 67570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 67670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit ZRL */ 67770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, entropy->ac_tbl_no, 0xF0); 67870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r -= 16; 67970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit buffered correction bits that must be associated with ZRL */ 68070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_buffered_bits(entropy, BR_buffer, BR); 68170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR_buffer = entropy->bit_buffer; /* BE bits are gone now */ 68270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR = 0; 68370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 68470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 68570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* If the coef was previously nonzero, it only needs a correction bit. 68670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * NOTE: a straight translation of the spec's figure G.7 would suggest 68770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * that we also need to test r > 15. But if r > 15, we can only get here 68870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * if k > EOB, which implies that this coefficient is not 1. 68970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 69070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (temp > 1) { 69170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* The correction bit is the next bit of the absolute value. */ 69270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR_buffer[BR++] = (char) (temp & 1); 69370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 69470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 69570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 69670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit any pending EOBRUN and the BE correction bits */ 69770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 69870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 69970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Count/emit Huffman symbol for run length / number of bits */ 70070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1); 70170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 70270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit output bit for newly-nonzero coef */ 70370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine temp = ((*block)[jpeg_natural_order[k]] < 0) ? 0 : 1; 70470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_bits(entropy, (unsigned int) temp, 1); 70570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 70670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Emit buffered correction bits that must be associated with this code */ 70770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_buffered_bits(entropy, BR_buffer, BR); 70870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR_buffer = entropy->bit_buffer; /* BE bits are gone now */ 70970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine BR = 0; 71070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine r = 0; /* reset zero run length */ 71170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 71270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 71370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (r > 0 || BR > 0) { /* If there are trailing zeroes, */ 71470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->EOBRUN++; /* count an EOB */ 71570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->BE += BR; /* concat my correction bits to older ones */ 71670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We force out the EOB if we risk either: 71770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 1. overflow of the EOB counter; 71870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 2. overflow of the correction bit buffer during the next MCU. 71970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 72070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->EOBRUN == 0x7FFF || entropy->BE > (MAX_CORR_BITS-DCTSIZE2+1)) 72170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 72270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 72370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 72470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->next_output_byte = entropy->next_output_byte; 72570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->free_in_buffer = entropy->free_in_buffer; 72670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 72770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Update restart-interval state too */ 72870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->restart_interval) { 72970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (entropy->restarts_to_go == 0) { 73070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go = cinfo->restart_interval; 73170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num++; 73270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_restart_num &= 7; 73370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 73470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->restarts_to_go--; 73570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 73670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 73770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 73870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 73970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 74070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 74170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 74270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Finish up at the end of a Huffman-compressed progressive scan. 74370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 74470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 74570a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 74670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinefinish_pass_phuff (j_compress_ptr cinfo) 74770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 74870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 74970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 75070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->next_output_byte = cinfo->dest->next_output_byte; 75170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->free_in_buffer = cinfo->dest->free_in_buffer; 75270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 75370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Flush out any buffered data */ 75470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 75570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine flush_bits(entropy); 75670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 75770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->next_output_byte = entropy->next_output_byte; 75870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->dest->free_in_buffer = entropy->free_in_buffer; 75970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 76070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 76170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 76270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 76370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Finish up a statistics-gathering pass and create the new Huffman tables. 76470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 76570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 76670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 76770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinefinish_pass_gather_phuff (j_compress_ptr cinfo) 76870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 76970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 77070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine boolean is_DC_band; 77170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int ci, tbl; 77270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info * compptr; 77370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JHUFF_TBL **htblptr; 77470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine boolean did[NUM_HUFF_TBLS]; 77570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 77670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Flush out buffered data (all we care about is counting the EOB symbol) */ 77770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine emit_eobrun(entropy); 77870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 77970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine is_DC_band = (cinfo->Ss == 0); 78070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 78170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* It's important not to apply jpeg_gen_optimal_table more than once 78270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * per table, because it clobbers the input frequency counts! 78370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 78470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MEMZERO(did, SIZEOF(did)); 78570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 78670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 78770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 78870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (is_DC_band) { 78970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->Ah != 0) /* DC refinement needs no table */ 79070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine continue; 79170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl = compptr->dc_tbl_no; 79270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 79370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tbl = compptr->ac_tbl_no; 79470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 79570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (! did[tbl]) { 79670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (is_DC_band) 79770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine htblptr = & cinfo->dc_huff_tbl_ptrs[tbl]; 79870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 79970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine htblptr = & cinfo->ac_huff_tbl_ptrs[tbl]; 80070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (*htblptr == NULL) 80170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); 80270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_gen_optimal_table(cinfo, *htblptr, entropy->count_ptrs[tbl]); 80370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine did[tbl] = TRUE; 80470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 80570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 80670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 80770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 80870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 80970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 81070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Module initialization routine for progressive Huffman entropy encoding. 81170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 81270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 81370a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 81470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejinit_phuff_encoder (j_compress_ptr cinfo) 81570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 81670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine phuff_entropy_ptr entropy; 81770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int i; 81870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 81970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy = (phuff_entropy_ptr) 82070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 82170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SIZEOF(phuff_entropy_encoder)); 82270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->entropy = (struct jpeg_entropy_encoder *) entropy; 82370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->pub.start_pass = start_pass_phuff; 82470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 82570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Mark tables unallocated */ 82670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (i = 0; i < NUM_HUFF_TBLS; i++) { 82770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->derived_tbls[i] = NULL; 82870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->count_ptrs[i] = NULL; 82970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 83070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine entropy->bit_buffer = NULL; /* needed only in AC refinement scan */ 83170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 83270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 83370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif /* C_PROGRESSIVE_SUPPORTED */ 834