19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jcphuff.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1995-1997, Thomas G. Lane. 59f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file is part of the Independent JPEG Group's software. 69f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * For conditions of distribution and use, see the accompanying README file. 79f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 89f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This file contains Huffman entropy encoding routines for progressive JPEG. 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We do not support output suspension in this module, since the library 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * currently does not allow multiple-scan files to be written with output 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * suspension. 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jchuff.h" /* Declarations shared with jchuff.c */ 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef C_PROGRESSIVE_SUPPORTED 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Expanded entropy encoder object for progressive Huffman encoding. */ 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_entropy_encoder pub; /* public fields */ 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Mode flag: TRUE for optimization, FALSE for actual data output */ 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean gather_statistics; 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Bit-level coding status. 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * next_output_byte/free_in_buffer are local copies of cinfo->dest fields. 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JOCTET * next_output_byte; /* => next byte to write in buffer */ 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 put_buffer; /* current bit-accumulation buffer */ 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int put_bits; /* # of bits now in it */ 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project j_compress_ptr cinfo; /* link to cinfo (needed for dump_buffer) */ 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Coding status for DC components */ 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */ 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Coding status for AC components */ 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ac_tbl_no; /* the table number of the single component */ 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int EOBRUN; /* run length of EOBs */ 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int BE; /* # of buffered correction bits before MCU */ 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project char * bit_buffer; /* buffer for correction bits (1 per char) */ 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* packing correction bits tightly would save some space but cost time... */ 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int restarts_to_go; /* MCUs left in this restart interval */ 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int next_restart_num; /* next restart number to write (0-7) */ 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Pointers to derived tables (these workspaces have image lifespan). 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Since any one scan codes only DC or only AC, we only need one set 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of tables, not one for DC and one for AC. 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c_derived_tbl * derived_tbls[NUM_HUFF_TBLS]; 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Statistics tables for optimization; again, one set is enough */ 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project long * count_ptrs[NUM_HUFF_TBLS]; 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} phuff_entropy_encoder; 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef phuff_entropy_encoder * phuff_entropy_ptr; 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* MAX_CORR_BITS is the number of bits the AC refinement correction-bit 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * buffer can hold. Larger sizes may slightly improve compression, but 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1000 is already well into the realm of overkill. 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The minimum safe size is 64 bits. 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define MAX_CORR_BITS 1000 /* Max # of correction bits I can buffer */ 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* IRIGHT_SHIFT is like RIGHT_SHIFT, but works on int rather than INT32. 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We assume that int right shift is unsigned if INT32 right shift is, 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * which should be safe. 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef RIGHT_SHIFT_IS_UNSIGNED 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define ISHIFT_TEMPS int ishift_temp; 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IRIGHT_SHIFT(x,shft) \ 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((ishift_temp = (x)) < 0 ? \ 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (ishift_temp >> (shft)) | ((~0) << (16-(shft))) : \ 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (ishift_temp >> (shft))) 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define ISHIFT_TEMPS 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define IRIGHT_SHIFT(x,shft) ((x) >> (shft)) 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Forward declarations */ 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) encode_mcu_DC_first JPP((j_compress_ptr cinfo, 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW *MCU_data)); 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) encode_mcu_AC_first JPP((j_compress_ptr cinfo, 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW *MCU_data)); 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) encode_mcu_DC_refine JPP((j_compress_ptr cinfo, 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW *MCU_data)); 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) encode_mcu_AC_refine JPP((j_compress_ptr cinfo, 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW *MCU_data)); 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) finish_pass_phuff JPP((j_compress_ptr cinfo)); 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) finish_pass_gather_phuff JPP((j_compress_ptr cinfo)); 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for a Huffman-compressed scan using progressive JPEG. 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_pass_phuff (j_compress_ptr cinfo, boolean gather_statistics) 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean is_DC_band; 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, tbl; 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info * compptr; 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->cinfo = cinfo; 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->gather_statistics = gather_statistics; 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project is_DC_band = (cinfo->Ss == 0); 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We assume jcmaster.c already validated the scan parameters. */ 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Select execution routines */ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->Ah == 0) { 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_DC_band) 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.encode_mcu = encode_mcu_DC_first; 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.encode_mcu = encode_mcu_AC_first; 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_DC_band) 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.encode_mcu = encode_mcu_DC_refine; 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else { 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.encode_mcu = encode_mcu_AC_refine; 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC refinement needs a correction bit buffer */ 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->bit_buffer == NULL) 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->bit_buffer = (char *) 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project MAX_CORR_BITS * SIZEOF(char)); 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (gather_statistics) 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.finish_pass = finish_pass_gather_phuff; 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.finish_pass = finish_pass_phuff; 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Only DC coefficients may be interleaved, so cinfo->comps_in_scan = 1 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * for AC coefficients. 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize DC predictions to 0 */ 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->last_dc_val[ci] = 0; 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Get table index */ 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_DC_band) { 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->Ah != 0) /* DC refinement needs no table */ 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tbl = compptr->dc_tbl_no; 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->ac_tbl_no = tbl = compptr->ac_tbl_no; 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (gather_statistics) { 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Check for invalid table index */ 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* (make_c_derived_tbl does this in the other path) */ 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (tbl < 0 || tbl >= NUM_HUFF_TBLS) 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, tbl); 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate and zero the statistics tables */ 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note that jpeg_gen_optimal_table expects 257 entries in each table! */ 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->count_ptrs[tbl] == NULL) 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->count_ptrs[tbl] = (long *) 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 257 * SIZEOF(long)); 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project MEMZERO(entropy->count_ptrs[tbl], 257 * SIZEOF(long)); 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute derived values for Huffman table */ 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We may do this more than once for a table, but it's not expensive */ 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_make_c_derived_tbl(cinfo, is_DC_band, tbl, 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project & entropy->derived_tbls[tbl]); 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize AC stuff */ 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->EOBRUN = 0; 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->BE = 0; 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize bit buffer to empty */ 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_buffer = 0; 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_bits = 0; 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Initialize restart stuff */ 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go = cinfo->restart_interval; 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num = 0; 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Outputting bytes to the file. 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NB: these must be called only when actually outputting, 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * that is, entropy->gather_statistics == FALSE. 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Emit a byte */ 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define emit_byte(entropy,val) \ 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project { *(entropy)->next_output_byte++ = (JOCTET) (val); \ 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (--(entropy)->free_in_buffer == 0) \ 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project dump_buffer(entropy); } 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectdump_buffer (phuff_entropy_ptr entropy) 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Empty the output buffer; we do not support suspension in this module. */ 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_destination_mgr * dest = entropy->cinfo->dest; 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*dest->empty_output_buffer) (entropy->cinfo)) 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(entropy->cinfo, JERR_CANT_SUSPEND); 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* After a successful buffer dump, must reset buffer pointers */ 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = dest->next_output_byte; 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = dest->free_in_buffer; 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Outputting bits to the file */ 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Only the right 24 bits of put_buffer are used; the valid bits are 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * left-justified in this part. At most 16 bits can be passed to emit_bits 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in one call, and we never retain more than 7 bits in put_buffer 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * between calls, so 24 bits are sufficient. 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectINLINE 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectemit_bits (phuff_entropy_ptr entropy, unsigned int code, int size) 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Emit some bits, unless we are in gather mode */ 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* This routine is heavily used, so it's worth coding tightly. */ 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register INT32 put_buffer = (INT32) code; 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int put_bits = entropy->put_bits; 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* if size is 0, caller used an invalid Huffman table entry */ 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (size == 0) 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE); 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->gather_statistics) 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* do nothing if we're only getting stats */ 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_buffer &= (((INT32) 1)<<size) - 1; /* mask off any extra bits in code */ 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_bits += size; /* new number of bits in buffer */ 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_buffer <<= 24 - put_bits; /* align incoming bits */ 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_buffer |= entropy->put_buffer; /* and merge with old buffer contents */ 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (put_bits >= 8) { 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int c = (int) ((put_buffer >> 16) & 0xFF); 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_byte(entropy, c); 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (c == 0xFF) { /* need to stuff a zero byte? */ 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_byte(entropy, 0); 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_buffer <<= 8; 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project put_bits -= 8; 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_buffer = put_buffer; /* update variables */ 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_bits = put_bits; 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectflush_bits (phuff_entropy_ptr entropy) 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, 0x7F, 7); /* fill any partial byte with ones */ 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_buffer = 0; /* and reset bit-buffer to empty */ 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->put_bits = 0; 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Emit (or just count) a Huffman symbol. 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectINLINE 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectemit_symbol (phuff_entropy_ptr entropy, int tbl_no, int symbol) 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->gather_statistics) 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->count_ptrs[tbl_no][symbol]++; 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else { 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project c_derived_tbl * tbl = entropy->derived_tbls[tbl_no]; 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, tbl->ehufco[symbol], tbl->ehufsi[symbol]); 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Emit bits from a correction bit buffer. 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectemit_buffered_bits (phuff_entropy_ptr entropy, char * bufstart, 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int nbits) 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->gather_statistics) 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return; /* no real work */ 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (nbits > 0) { 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, (unsigned int) (*bufstart), 1); 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project bufstart++; 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits--; 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Emit any pending EOBRUN symbol. 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectemit_eobrun (phuff_entropy_ptr entropy) 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int temp, nbits; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->EOBRUN > 0) { /* if there is any pending EOBRUN */ 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = entropy->EOBRUN; 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits = 0; 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while ((temp >>= 1)) 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits++; 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* safety check: shouldn't happen given limited correction-bit buffer */ 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nbits > 14) 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(entropy->cinfo, JERR_HUFF_MISSING_CODE); 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, entropy->ac_tbl_no, nbits << 4); 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nbits) 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, entropy->EOBRUN, nbits); 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->EOBRUN = 0; 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit any buffered correction bits */ 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_buffered_bits(entropy, entropy->bit_buffer, entropy->BE); 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->BE = 0; 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Emit a restart marker & resynchronize predictions. 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectemit_restart (phuff_entropy_ptr entropy, int restart_num) 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci; 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! entropy->gather_statistics) { 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project flush_bits(entropy); 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_byte(entropy, 0xFF); 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_byte(entropy, JPEG_RST0 + restart_num); 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->cinfo->Ss == 0) { 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Re-initialize DC predictions to 0 */ 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < entropy->cinfo->comps_in_scan; ci++) 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->last_dc_val[ci] = 0; 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Re-initialize all AC-related fields to 0 */ 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->EOBRUN = 0; 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->BE = 0; 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * MCU encoding for DC initial scan (either spectral selection, 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * or first pass of successive approximation). 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectencode_mcu_DC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int temp, temp2; 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int nbits; 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int blkn, ci; 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Al = cinfo->Al; 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW block; 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info * compptr; 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ISHIFT_TEMPS 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = cinfo->dest->next_output_byte; 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = cinfo->dest->free_in_buffer; 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit restart marker if needed */ 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_restart(entropy, entropy->next_restart_num); 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the MCU data blocks */ 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block = MCU_data[blkn]; 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci = cinfo->MCU_membership[blkn]; 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute the DC value after the required point transform by Al. 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This is simply an arithmetic right shift. 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp2 = IRIGHT_SHIFT((int) ((*block)[0]), Al); 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* DC differences are figured on the point-transformed values. */ 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = temp2 - entropy->last_dc_val[ci]; 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->last_dc_val[ci] = temp2; 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the DC coefficient difference per section G.1.2.1 */ 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp2 = temp; 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp < 0) { 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = -temp; /* temp is abs value of input */ 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* For a negative input, want temp2 = bitwise complement of abs(input) */ 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* This code assumes we are on a two's complement machine */ 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp2--; 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Find the number of bits needed for the magnitude of the coefficient */ 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits = 0; 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (temp) { 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits++; 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp >>= 1; 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Check for out-of-range coefficient values. 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Since we're encoding a difference, the range limit is twice as much. 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nbits > MAX_COEF_BITS+1) 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BAD_DCT_COEF); 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count/emit the Huffman-coded symbol for the number of bits */ 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, compptr->dc_tbl_no, nbits); 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit that number of bits of the value, if positive, */ 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* or the complement of its magnitude, if negative. */ 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nbits) /* emit_bits rejects calls with size 0 */ 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, (unsigned int) temp2, nbits); 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->next_output_byte = entropy->next_output_byte; 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->free_in_buffer = entropy->free_in_buffer; 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update restart-interval state too */ 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) { 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) { 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go = cinfo->restart_interval; 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num++; 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num &= 7; 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go--; 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * MCU encoding for AC initial scan (either spectral selection, 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * or first pass of successive approximation). 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectencode_mcu_AC_first (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int temp, temp2; 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int nbits; 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int r, k; 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Se = cinfo->Se; 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Al = cinfo->Al; 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW block; 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = cinfo->dest->next_output_byte; 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = cinfo->dest->free_in_buffer; 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit restart marker if needed */ 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) 4799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) 4809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_restart(entropy, entropy->next_restart_num); 4819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the MCU data block */ 4839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block = MCU_data[0]; 4849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the AC coefficients per section G.1.2.2, fig. G.3 */ 4869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r = 0; /* r = run length of zeros */ 4889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (k = cinfo->Ss; k <= Se; k++) { 4909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((temp = (*block)[jpeg_natural_order[k]]) == 0) { 4919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r++; 4929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 4939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We must apply the point transform by Al. For AC coefficients this 4959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is an integer division with rounding towards 0. To do this portably 4969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in C, we shift after obtaining the absolute value; so the code is 4979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * interwoven with finding the abs value (temp) and output bits (temp2). 4989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp < 0) { 5009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = -temp; /* temp is abs value of input */ 5019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp >>= Al; /* apply the point transform */ 5029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* For a negative coef, want temp2 = bitwise complement of abs(coef) */ 5039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp2 = ~temp; 5049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp >>= Al; /* apply the point transform */ 5069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp2 = temp; 5079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Watch out for case that nonzero coef is zero after point transform */ 5099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp == 0) { 5109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r++; 5119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 5129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit any pending EOBRUN */ 5159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->EOBRUN > 0) 5169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 5179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* if run length > 15, must emit special run-length-16 codes (0xF0) */ 5189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (r > 15) { 5199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, entropy->ac_tbl_no, 0xF0); 5209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r -= 16; 5219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Find the number of bits needed for the magnitude of the coefficient */ 5249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits = 1; /* there must be at least one 1 bit */ 5259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while ((temp >>= 1)) 5269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project nbits++; 5279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Check for out-of-range coefficient values */ 5289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (nbits > MAX_COEF_BITS) 5299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BAD_DCT_COEF); 5309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count/emit Huffman symbol for run length / number of bits */ 5329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + nbits); 5339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit that number of bits of the value, if positive, */ 5359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* or the complement of its magnitude, if negative. */ 5369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, (unsigned int) temp2, nbits); 5379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r = 0; /* reset zero run length */ 5399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (r > 0) { /* If there are trailing zeroes, */ 5429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->EOBRUN++; /* count an EOB */ 5439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->EOBRUN == 0x7FFF) 5449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); /* force it out to avoid overflow */ 5459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->next_output_byte = entropy->next_output_byte; 5489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->free_in_buffer = entropy->free_in_buffer; 5499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update restart-interval state too */ 5519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) { 5529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) { 5539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go = cinfo->restart_interval; 5549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num++; 5559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num &= 7; 5569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go--; 5589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 5619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 5629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 5659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * MCU encoding for DC successive approximation refinement scan. 5669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: we assume such scans can be multi-component, although the spec 5679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is not very clear on the point. 5689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 5699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) 5719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectencode_mcu_DC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 5729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 5739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 5749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int temp; 5759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int blkn; 5769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Al = cinfo->Al; 5779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW block; 5789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = cinfo->dest->next_output_byte; 5809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = cinfo->dest->free_in_buffer; 5819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit restart marker if needed */ 5839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) 5849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) 5859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_restart(entropy, entropy->next_restart_num); 5869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the MCU data blocks */ 5889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) { 5899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block = MCU_data[blkn]; 5909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We simply emit the Al'th bit of the DC coefficient value. */ 5929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = (*block)[0]; 5939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, (unsigned int) (temp >> Al), 1); 5949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->next_output_byte = entropy->next_output_byte; 5979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->free_in_buffer = entropy->free_in_buffer; 5989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 5999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update restart-interval state too */ 6009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) { 6019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) { 6029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go = cinfo->restart_interval; 6039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num++; 6049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num &= 7; 6059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go--; 6079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 6109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 6119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 6149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * MCU encoding for AC successive approximation refinement scan. 6159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(boolean) 6189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectencode_mcu_AC_refine (j_compress_ptr cinfo, JBLOCKROW *MCU_data) 6199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 6209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 6219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int temp; 6229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project register int r, k; 6239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int EOB; 6249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project char *BR_buffer; 6259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project unsigned int BR; 6269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Se = cinfo->Se; 6279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Al = cinfo->Al; 6289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW block; 6299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int absvalues[DCTSIZE2]; 6309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = cinfo->dest->next_output_byte; 6329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = cinfo->dest->free_in_buffer; 6339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit restart marker if needed */ 6359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) 6369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) 6379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_restart(entropy, entropy->next_restart_num); 6389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the MCU data block */ 6409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block = MCU_data[0]; 6419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* It is convenient to make a pre-pass to determine the transformed 6439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * coefficients' absolute values and the EOB position. 6449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project EOB = 0; 6469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (k = cinfo->Ss; k <= Se; k++) { 6479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = (*block)[jpeg_natural_order[k]]; 6489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We must apply the point transform by Al. For AC coefficients this 6499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is an integer division with rounding towards 0. To do this portably 6509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * in C, we shift after obtaining the absolute value. 6519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp < 0) 6539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = -temp; /* temp is abs value of input */ 6549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp >>= Al; /* apply the point transform */ 6559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project absvalues[k] = temp; /* save abs value for main pass */ 6569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp == 1) 6579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project EOB = k; /* EOB = index of last newly-nonzero coef */ 6589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Encode the AC coefficients per section G.1.2.3, fig. G.7 */ 6619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r = 0; /* r = run length of zeros */ 6639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR = 0; /* BR = count of buffered bits added now */ 6649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR_buffer = entropy->bit_buffer + entropy->BE; /* Append bits to buffer */ 6659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (k = cinfo->Ss; k <= Se; k++) { 6679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((temp = absvalues[k]) == 0) { 6689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r++; 6699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 6709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit any required ZRLs, but not if they can be folded into EOB */ 6739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (r > 15 && k <= EOB) { 6749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* emit any pending EOBRUN and the BE correction bits */ 6759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 6769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit ZRL */ 6779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, entropy->ac_tbl_no, 0xF0); 6789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r -= 16; 6799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit buffered correction bits that must be associated with ZRL */ 6809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_buffered_bits(entropy, BR_buffer, BR); 6819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR_buffer = entropy->bit_buffer; /* BE bits are gone now */ 6829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR = 0; 6839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If the coef was previously nonzero, it only needs a correction bit. 6869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NOTE: a straight translation of the spec's figure G.7 would suggest 6879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * that we also need to test r > 15. But if r > 15, we can only get here 6889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * if k > EOB, which implies that this coefficient is not 1. 6899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (temp > 1) { 6919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The correction bit is the next bit of the absolute value. */ 6929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR_buffer[BR++] = (char) (temp & 1); 6939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 6949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit any pending EOBRUN and the BE correction bits */ 6979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 6989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count/emit Huffman symbol for run length / number of bits */ 7009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_symbol(entropy, entropy->ac_tbl_no, (r << 4) + 1); 7019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit output bit for newly-nonzero coef */ 7039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project temp = ((*block)[jpeg_natural_order[k]] < 0) ? 0 : 1; 7049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_bits(entropy, (unsigned int) temp, 1); 7059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Emit buffered correction bits that must be associated with this code */ 7079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_buffered_bits(entropy, BR_buffer, BR); 7089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR_buffer = entropy->bit_buffer; /* BE bits are gone now */ 7099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project BR = 0; 7109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project r = 0; /* reset zero run length */ 7119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (r > 0 || BR > 0) { /* If there are trailing zeroes, */ 7149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->EOBRUN++; /* count an EOB */ 7159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->BE += BR; /* concat my correction bits to older ones */ 7169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We force out the EOB if we risk either: 7179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1. overflow of the EOB counter; 7189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 2. overflow of the correction bit buffer during the next MCU. 7199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->EOBRUN == 0x7FFF || entropy->BE > (MAX_CORR_BITS-DCTSIZE2+1)) 7219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 7229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->next_output_byte = entropy->next_output_byte; 7259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->free_in_buffer = entropy->free_in_buffer; 7269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update restart-interval state too */ 7289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->restart_interval) { 7299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (entropy->restarts_to_go == 0) { 7309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go = cinfo->restart_interval; 7319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num++; 7329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_restart_num &= 7; 7339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->restarts_to_go--; 7359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 7389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 7399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 7429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Finish up at the end of a Huffman-compressed progressive scan. 7439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 7469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfinish_pass_phuff (j_compress_ptr cinfo) 7479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 7489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 7499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->next_output_byte = cinfo->dest->next_output_byte; 7519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->free_in_buffer = cinfo->dest->free_in_buffer; 7529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Flush out any buffered data */ 7549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 7559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project flush_bits(entropy); 7569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->next_output_byte = entropy->next_output_byte; 7589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->dest->free_in_buffer = entropy->free_in_buffer; 7599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 7609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 7639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Finish up a statistics-gathering pass and create the new Huffman tables. 7649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 7679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectfinish_pass_gather_phuff (j_compress_ptr cinfo) 7689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 7699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy; 7709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean is_DC_band; 7719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, tbl; 7729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info * compptr; 7739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JHUFF_TBL **htblptr; 7749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean did[NUM_HUFF_TBLS]; 7759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Flush out buffered data (all we care about is counting the EOB symbol) */ 7779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project emit_eobrun(entropy); 7789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project is_DC_band = (cinfo->Ss == 0); 7809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* It's important not to apply jpeg_gen_optimal_table more than once 7829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * per table, because it clobbers the input frequency counts! 7839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 7849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project MEMZERO(did, SIZEOF(did)); 7859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 7879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 7889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_DC_band) { 7899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->Ah != 0) /* DC refinement needs no table */ 7909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 7919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tbl = compptr->dc_tbl_no; 7929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project tbl = compptr->ac_tbl_no; 7949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! did[tbl]) { 7969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (is_DC_band) 7979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project htblptr = & cinfo->dc_huff_tbl_ptrs[tbl]; 7989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 7999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project htblptr = & cinfo->ac_huff_tbl_ptrs[tbl]; 8009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (*htblptr == NULL) 8019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo); 8029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_gen_optimal_table(cinfo, *htblptr, entropy->count_ptrs[tbl]); 8039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project did[tbl] = TRUE; 8049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 8079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 8109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Module initialization routine for progressive Huffman entropy encoding. 8119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 8129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 8149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjinit_phuff_encoder (j_compress_ptr cinfo) 8159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 8169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project phuff_entropy_ptr entropy; 8179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i; 8189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy = (phuff_entropy_ptr) 8209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 8219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SIZEOF(phuff_entropy_encoder)); 8229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->entropy = (struct jpeg_entropy_encoder *) entropy; 8239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->pub.start_pass = start_pass_phuff; 8249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Mark tables unallocated */ 8269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < NUM_HUFF_TBLS; i++) { 8279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->derived_tbls[i] = NULL; 8289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->count_ptrs[i] = NULL; 8299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 8309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project entropy->bit_buffer = NULL; /* needed only in AC refinement scan */ 8319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 8329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 8339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* C_PROGRESSIVE_SUPPORTED */ 834