jdcoefct.c revision 9f5d49a1588e438ae7ceabd0c94172117e3303aa
19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jdcoefct.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1997, 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 the coefficient buffer controller for decompression. 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This controller is the top level of the JPEG decompressor proper. 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The coefficient buffer lies between entropy decoding and inverse-DCT steps. 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In buffered-image mode, this controller is the interface between 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * input-oriented processing and output-oriented processing. 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Also, the input side (only) is used when reading a file for transcoding. 159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define JPEG_INTERNALS 189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jinclude.h" 199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#include "jpeglib.h" 209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Block smoothing is only applicable for progressive JPEG, so: */ 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifndef D_PROGRESSIVE_SUPPORTED 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#undef BLOCK_SMOOTHING_SUPPORTED 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Private buffer controller object */ 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef struct { 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project struct jpeg_d_coef_controller pub; /* public fields */ 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* These variables keep track of the current location of the input side. */ 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* cinfo->input_iMCU_row is also used for this. */ 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION MCU_ctr; /* counts MCUs processed in current row */ 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int MCU_vert_offset; /* counts MCU rows within iMCU row */ 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int MCU_rows_per_iMCU_row; /* number of such rows needed */ 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* The output side's location is represented by cinfo->output_iMCU_row. */ 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* In single-pass modes, it's sufficient to buffer just one MCU. 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and let the entropy decoder write into that workspace each time. 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * (On 80x86, the workspace is FAR even though it's not really very big; 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * this is to keep the module interfaces unchanged when a large coefficient 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * buffer is necessary.) 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In multi-pass modes, this array points to the current MCU's blocks 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * within the virtual arrays; it is used only by the input side. 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* In multi-pass modes, we need a virtual block array for each component. */ 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jvirt_barray_ptr whole_image[MAX_COMPONENTS]; 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* When doing block smoothing, we latch coefficient Al values here */ 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * coef_bits_latch; 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define SAVED_COEFS 6 /* we save coef_bits[0..5] */ 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} my_coef_controller; 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projecttypedef my_coef_controller * my_coef_ptr; 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Forward declarations */ 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) decompress_onepass 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) decompress_data 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boolean) smoothing_ok JPP((j_decompress_ptr cinfo)); 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) decompress_smooth_data 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JPP((j_decompress_ptr cinfo, JSAMPIMAGE output_buf)); 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(void) 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_iMCU_row (j_decompress_ptr cinfo) 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Reset within-iMCU-row counters for a new row (input side) */ 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* In an interleaved scan, an MCU row is the same as an iMCU row. 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * But at the bottom of the image, process only what's left. 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->comps_in_scan > 1) { 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_rows_per_iMCU_row = 1; 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1)) 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_ctr = 0; 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_vert_offset = 0; 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for an input processing pass. 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_input_pass (j_decompress_ptr cinfo) 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->input_iMCU_row = 0; 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project start_iMCU_row(cinfo); 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for an output processing pass. 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(void) 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectstart_output_pass (j_decompress_ptr cinfo) 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If multipass, check to see whether to use block smoothing on this pass */ 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (coef->pub.coef_arrays != NULL) { 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->do_block_smoothing && smoothing_ok(cinfo)) 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.decompress_data = decompress_smooth_data; 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.decompress_data = decompress_data; 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_iMCU_row = 0; 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Decompress and return some data in the single-pass case. 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Always attempts to emit one fully interleaved MCU row ("iMCU" row). 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Input and output must run in lockstep since we have only a one-MCU buffer. 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NB: output_buf contains a plane for each component in image, 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * which we index according to the component's SOF position. 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectdecompress_onepass (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION MCU_col_num; /* index of current MCU within row */ 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int blkn, ci, xindex, yindex, yoffset, useful_width; 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_ptr; 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION start_col, output_col; 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT_method_ptr inverse_DCT; 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Loop to process as much as one whole iMCU row */ 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project yoffset++) { 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (MCU_col_num = coef->MCU_ctr; MCU_col_num <= last_MCU_col; 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project MCU_col_num++) { 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Try to fetch an MCU. Entropy decoder expects buffer to be zeroed. */ 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jzero_far((void FAR *) coef->MCU_buffer[0], 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (size_t) (cinfo->blocks_in_MCU * SIZEOF(JBLOCK))); 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Suspension forced; update state counters and exit */ 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_vert_offset = yoffset; 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_ctr = MCU_col_num; 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SUSPENDED; 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Determine where data should go in output_buf and do the IDCT thing. 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We skip dummy blocks at the right and bottom edges (but blkn gets 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * incremented past them!). Note the inner loop relies on having 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * allocated the MCU_buffer[] blocks sequentially. 1779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project blkn = 0; /* index of current DCT block within MCU */ 1799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 1809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 1819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to IDCT an uninteresting component. */ 1829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! compptr->component_needed) { 1839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project blkn += compptr->MCU_blocks; 1849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 1859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT = cinfo->idct->inverse_DCT[compptr->component_index]; 1879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project useful_width = (MCU_col_num < last_MCU_col) ? compptr->MCU_width 1889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project : compptr->last_col_width; 1899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr = output_buf[compptr->component_index] + 1909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project yoffset * compptr->DCT_scaled_size; 1919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project start_col = MCU_col_num * compptr->MCU_sample_width; 1929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 1939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->input_iMCU_row < last_iMCU_row || 1949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project yoffset+yindex < compptr->last_row_height) { 1959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col = start_col; 1969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (xindex = 0; xindex < useful_width; xindex++) { 1979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*inverse_DCT) (cinfo, compptr, 1989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JCOEFPTR) coef->MCU_buffer[blkn+xindex], 1999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr, output_col); 2009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col += compptr->DCT_scaled_size; 2019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project blkn += compptr->MCU_width; 2049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr += compptr->DCT_scaled_size; 2059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed an MCU row, but perhaps not an iMCU row */ 2099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_ctr = 0; 2109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed the iMCU row, advance counters for next one */ 2129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_iMCU_row++; 2139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { 2149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project start_iMCU_row(cinfo); 2159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_ROW_COMPLETED; 2169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed the scan */ 2189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->inputctl->finish_input_pass) (cinfo); 2199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SCAN_COMPLETED; 2209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Dummy consume-input routine for single-pass operation. 2259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) 2289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectdummy_consume_data (j_decompress_ptr cinfo) 2299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SUSPENDED; /* Always indicate nothing was done */ 2319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 2359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Consume input data and store it in the full-image coefficient buffer. 2389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We read as much as one fully interleaved MCU row ("iMCU" row) per call, 2399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * ie, v_samp_factor block rows for each component in the scan. 2409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. 2419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) 2449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectconsume_data (j_decompress_ptr cinfo) 2459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 2479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION MCU_col_num; /* index of current MCU within row */ 2489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int blkn, ci, xindex, yindex, yoffset; 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION start_col; 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW buffer_ptr; 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Align the virtual buffers for the components used in this scan. */ 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer[ci] = (*cinfo->mem->access_virt_barray) 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->input_iMCU_row * compptr->v_samp_factor, 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) compptr->v_samp_factor, TRUE); 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note: entropy decoder expects buffer to be zeroed, 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * but this is handled automatically by the memory manager 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * because we requested a pre-zeroed array. 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Loop to process one whole iMCU row */ 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project yoffset++) { 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (MCU_col_num = coef->MCU_ctr; MCU_col_num < cinfo->MCUs_per_row; 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project MCU_col_num++) { 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Construct list of pointers to DCT blocks belonging to this MCU */ 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project blkn = 0; /* index of current DCT block within MCU */ 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project compptr = cinfo->cur_comp_info[ci]; 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project start_col = MCU_col_num * compptr->MCU_width; 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer_ptr = buffer[ci][yindex+yoffset] + start_col; 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (xindex = 0; xindex < compptr->MCU_width; xindex++) { 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_buffer[blkn++] = buffer_ptr++; 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Try to fetch the MCU. */ 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->entropy->decode_mcu) (cinfo, coef->MCU_buffer)) { 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Suspension forced; update state counters and exit */ 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_vert_offset = yoffset; 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_ctr = MCU_col_num; 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SUSPENDED; 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed an MCU row, but perhaps not an iMCU row */ 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_ctr = 0; 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed the iMCU row, advance counters for next one */ 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++(cinfo->input_iMCU_row) < cinfo->total_iMCU_rows) { 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project start_iMCU_row(cinfo); 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_ROW_COMPLETED; 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Completed the scan */ 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->inputctl->finish_input_pass) (cinfo); 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SCAN_COMPLETED; 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Decompress and return some data in the multi-pass case. 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Always attempts to emit one fully interleaved MCU row ("iMCU" row). 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Return value is JPEG_ROW_COMPLETED, JPEG_SCAN_COMPLETED, or JPEG_SUSPENDED. 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * NB: output_buf contains a plane for each component in image. 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectdecompress_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION block_num; 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, block_row, block_rows; 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKARRAY buffer; 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW buffer_ptr; 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_ptr; 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION output_col; 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT_method_ptr inverse_DCT; 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Force some input to be done if we are getting ahead of the input. */ 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (cinfo->input_scan_number < cinfo->output_scan_number || 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (cinfo->input_scan_number == cinfo->output_scan_number && 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->input_iMCU_row <= cinfo->output_iMCU_row)) { 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED) 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SUSPENDED; 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* OK, output from the virtual arrays. */ 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to IDCT an uninteresting component. */ 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! compptr->component_needed) 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Align the virtual buffer for this component. */ 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer = (*cinfo->mem->access_virt_barray) 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, coef->whole_image[ci], 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_iMCU_row * compptr->v_samp_factor, 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) compptr->v_samp_factor, FALSE); 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count non-dummy DCT block rows in this iMCU row. */ 3489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_iMCU_row < last_iMCU_row) 3499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block_rows = compptr->v_samp_factor; 3509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else { 3519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* NB: can't use last_row_height here; it is input-side-dependent! */ 3529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 3539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (block_rows == 0) block_rows = compptr->v_samp_factor; 3549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT = cinfo->idct->inverse_DCT[ci]; 3569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr = output_buf[ci]; 3579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Loop over all DCT blocks to be processed. */ 3589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (block_row = 0; block_row < block_rows; block_row++) { 3599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer_ptr = buffer[block_row]; 3609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col = 0; 3619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (block_num = 0; block_num < compptr->width_in_blocks; block_num++) { 3629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) buffer_ptr, 3639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr, output_col); 3649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer_ptr++; 3659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col += compptr->DCT_scaled_size; 3669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr += compptr->DCT_scaled_size; 3689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) 3729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_ROW_COMPLETED; 3739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SCAN_COMPLETED; 3749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* D_MULTISCAN_FILES_SUPPORTED */ 3779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 3809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This code applies interblock smoothing as described by section K.8 3839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of the JPEG standard: the first 5 AC coefficients are estimated from 3849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the DC values of a DCT block and its 8 neighboring blocks. 3859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We apply smoothing only for progressive JPEG decoding, and only if 3869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the coefficients it can estimate are not yet known to full precision. 3879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Natural-order array positions of the first 5 zigzag-order coefficients */ 3909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define Q01_POS 1 3919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define Q10_POS 8 3929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define Q20_POS 16 3939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define Q11_POS 9 3949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#define Q02_POS 2 3959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Determine whether block smoothing is applicable and safe. 3989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We also latch the current states of the coef_bits[] entries for the 3999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * AC coefficients; otherwise, if the input side of the decompressor 4009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * advances into a new scan, we might think the coefficients are known 4019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * more accurately than they really are. 4029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boolean) 4059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectsmoothing_ok (j_decompress_ptr cinfo) 4069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 4089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean smoothing_useful = FALSE; 4099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, coefi; 4109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 4119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JQUANT_TBL * qtable; 4129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * coef_bits; 4139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int * coef_bits_latch; 4149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! cinfo->progressive_mode || cinfo->coef_bits == NULL) 4169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; 4179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate latch area if not already done */ 4199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (coef->coef_bits_latch == NULL) 4209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->coef_bits_latch = (int *) 4219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 4229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->num_components * 4239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (SAVED_COEFS * SIZEOF(int))); 4249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef_bits_latch = coef->coef_bits_latch; 4259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 4279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 4289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* All components' quantization values must already be latched. */ 4299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((qtable = compptr->quant_table) == NULL) 4309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; 4319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Verify DC & first 5 AC quantizers are nonzero to avoid zero-divide. */ 4329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (qtable->quantval[0] == 0 || 4339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project qtable->quantval[Q01_POS] == 0 || 4349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project qtable->quantval[Q10_POS] == 0 || 4359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project qtable->quantval[Q20_POS] == 0 || 4369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project qtable->quantval[Q11_POS] == 0 || 4379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project qtable->quantval[Q02_POS] == 0) 4389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; 4399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* DC values must be at least partly known for all components. */ 4409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef_bits = cinfo->coef_bits[ci]; 4419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (coef_bits[0] < 0) 4429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; 4439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Block smoothing is helpful if some AC coefficients remain inaccurate. */ 4449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (coefi = 1; coefi <= 5; coefi++) { 4459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef_bits_latch[coefi] = coef_bits[coefi]; 4469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (coef_bits[coefi] != 0) 4479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project smoothing_useful = TRUE; 4489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef_bits_latch += SAVED_COEFS; 4509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return smoothing_useful; 4539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 4549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 4579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Variant of decompress_data for use when doing block smoothing. 4589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectMETHODDEF(int) 4619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectdecompress_smooth_data (j_decompress_ptr cinfo, JSAMPIMAGE output_buf) 4629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 4639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 4649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 4659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION block_num, last_block_column; 4669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, block_row, block_rows, access_rows; 4679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKARRAY buffer; 4689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW buffer_ptr, prev_block_row, next_block_row; 4699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JSAMPARRAY output_ptr; 4709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION output_col; 4719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 4729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT_method_ptr inverse_DCT; 4739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project boolean first_row, last_row; 4749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCK workspace; 4759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int *coef_bits; 4769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JQUANT_TBL *quanttbl; 4779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project INT32 Q00,Q01,Q02,Q10,Q11,Q20, num; 4789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int DC1,DC2,DC3,DC4,DC5,DC6,DC7,DC8,DC9; 4799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int Al, pred; 4809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Force some input to be done if we are getting ahead of the input. */ 4829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (cinfo->input_scan_number <= cinfo->output_scan_number && 4839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ! cinfo->inputctl->eoi_reached) { 4849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->input_scan_number == cinfo->output_scan_number) { 4859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If input is working on current scan, we ordinarily want it to 4869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * have completed the current row. But if input scan is DC, 4879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * we want it to keep one row ahead so that next block row's DC 4889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * values are up to date. 4899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 4909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION delta = (cinfo->Ss == 0) ? 1 : 0; 4919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->input_iMCU_row > cinfo->output_iMCU_row+delta) 4929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 4939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((*cinfo->inputctl->consume_input)(cinfo) == JPEG_SUSPENDED) 4959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SUSPENDED; 4969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 4979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 4989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* OK, output from the virtual arrays. */ 4999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 5009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 5019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Don't bother to IDCT an uninteresting component. */ 5029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! compptr->component_needed) 5039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project continue; 5049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Count non-dummy DCT block rows in this iMCU row. */ 5059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_iMCU_row < last_iMCU_row) { 5069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block_rows = compptr->v_samp_factor; 5079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project access_rows = block_rows * 2; /* this and next iMCU row */ 5089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project last_row = FALSE; 5099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* NB: can't use last_row_height here; it is input-side-dependent! */ 5119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project block_rows = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 5129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (block_rows == 0) block_rows = compptr->v_samp_factor; 5139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project access_rows = block_rows; /* this iMCU row only */ 5149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project last_row = TRUE; 5159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Align the virtual buffer for this component. */ 5179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_iMCU_row > 0) { 5189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project access_rows += compptr->v_samp_factor; /* prior iMCU row too */ 5199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer = (*cinfo->mem->access_virt_barray) 5209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, coef->whole_image[ci], 5219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (cinfo->output_iMCU_row - 1) * compptr->v_samp_factor, 5229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) access_rows, FALSE); 5239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer += compptr->v_samp_factor; /* point to current iMCU row */ 5249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project first_row = FALSE; 5259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer = (*cinfo->mem->access_virt_barray) 5279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, coef->whole_image[ci], 5289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) 0, (JDIMENSION) access_rows, FALSE); 5299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project first_row = TRUE; 5309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Fetch component-dependent info */ 5329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef_bits = coef->coef_bits_latch + (ci * SAVED_COEFS); 5339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project quanttbl = compptr->quant_table; 5349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q00 = quanttbl->quantval[0]; 5359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q01 = quanttbl->quantval[Q01_POS]; 5369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q10 = quanttbl->quantval[Q10_POS]; 5379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q20 = quanttbl->quantval[Q20_POS]; 5389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q11 = quanttbl->quantval[Q11_POS]; 5399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project Q02 = quanttbl->quantval[Q02_POS]; 5409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project inverse_DCT = cinfo->idct->inverse_DCT[ci]; 5419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr = output_buf[ci]; 5429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Loop over all DCT blocks to be processed. */ 5439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (block_row = 0; block_row < block_rows; block_row++) { 5449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer_ptr = buffer[block_row]; 5459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (first_row && block_row == 0) 5469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project prev_block_row = buffer_ptr; 5479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 5489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project prev_block_row = buffer[block_row-1]; 5499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (last_row && block_row == block_rows-1) 5509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project next_block_row = buffer_ptr; 5519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project else 5529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project next_block_row = buffer[block_row+1]; 5539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We fetch the surrounding DC values using a sliding-register approach. 5549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize all nine here so as to do the right thing on narrow pics. 5559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 5569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC1 = DC2 = DC3 = (int) prev_block_row[0][0]; 5579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC4 = DC5 = DC6 = (int) buffer_ptr[0][0]; 5589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC7 = DC8 = DC9 = (int) next_block_row[0][0]; 5599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col = 0; 5609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project last_block_column = compptr->width_in_blocks - 1; 5619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (block_num = 0; block_num <= last_block_column; block_num++) { 5629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Fetch current DCT block into workspace so we can modify it. */ 5639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jcopy_block_row(buffer_ptr, (JBLOCKROW) workspace, (JDIMENSION) 1); 5649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Update DC values */ 5659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (block_num < last_block_column) { 5669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC3 = (int) prev_block_row[1][0]; 5679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC6 = (int) buffer_ptr[1][0]; 5689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC9 = (int) next_block_row[1][0]; 5699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Compute coefficient estimates per K.8. 5719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * An estimate is applied only if coefficient is still zero, 5729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * and is not known to be fully accurate. 5739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 5749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC01 */ 5759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((Al=coef_bits[1]) != 0 && workspace[1] == 0) { 5769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num = 36 * Q00 * (DC4 - DC6); 5779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num >= 0) { 5789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q01<<7) + num) / (Q01<<8)); 5799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 5809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 5819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q01<<7) - num) / (Q01<<8)); 5839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 5849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 5859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = -pred; 5869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project workspace[1] = (JCOEF) pred; 5889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 5899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC10 */ 5909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((Al=coef_bits[2]) != 0 && workspace[8] == 0) { 5919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num = 36 * Q00 * (DC2 - DC8); 5929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num >= 0) { 5939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q10<<7) + num) / (Q10<<8)); 5949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 5959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 5969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 5979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q10<<7) - num) / (Q10<<8)); 5989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 5999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = -pred; 6019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project workspace[8] = (JCOEF) pred; 6039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC20 */ 6059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((Al=coef_bits[3]) != 0 && workspace[16] == 0) { 6069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num = 9 * Q00 * (DC2 + DC8 - 2*DC5); 6079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num >= 0) { 6089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q20<<7) + num) / (Q20<<8)); 6099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 6129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q20<<7) - num) / (Q20<<8)); 6139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = -pred; 6169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project workspace[16] = (JCOEF) pred; 6189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC11 */ 6209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((Al=coef_bits[4]) != 0 && workspace[9] == 0) { 6219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num = 5 * Q00 * (DC1 - DC3 - DC7 + DC9); 6229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num >= 0) { 6239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q11<<7) + num) / (Q11<<8)); 6249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 6279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q11<<7) - num) / (Q11<<8)); 6289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = -pred; 6319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project workspace[9] = (JCOEF) pred; 6339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* AC02 */ 6359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((Al=coef_bits[5]) != 0 && workspace[2] == 0) { 6369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num = 9 * Q00 * (DC4 + DC6 - 2*DC5); 6379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num >= 0) { 6389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q02<<7) + num) / (Q02<<8)); 6399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 6429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (int) (((Q02<<7) - num) / (Q02<<8)); 6439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (Al > 0 && pred >= (1<<Al)) 6449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = (1<<Al)-1; 6459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project pred = -pred; 6469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project workspace[2] = (JCOEF) pred; 6489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* OK, do the IDCT */ 6509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*inverse_DCT) (cinfo, compptr, (JCOEFPTR) workspace, 6519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr, output_col); 6529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Advance for next column */ 6539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC1 = DC2; DC2 = DC3; 6549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC4 = DC5; DC5 = DC6; 6559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project DC7 = DC8; DC8 = DC9; 6569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer_ptr++, prev_block_row++, next_block_row++; 6579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_col += compptr->DCT_scaled_size; 6589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project output_ptr += compptr->DCT_scaled_size; 6609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 6629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++(cinfo->output_iMCU_row) < cinfo->total_iMCU_rows) 6649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_ROW_COMPLETED; 6659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return JPEG_SCAN_COMPLETED; 6669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 6679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* BLOCK_SMOOTHING_SUPPORTED */ 6699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 6729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize coefficient buffer controller. 6739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 6749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 6769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjinit_d_coef_controller (j_decompress_ptr cinfo, boolean need_full_buffer) 6779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 6789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project my_coef_ptr coef; 6799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef = (my_coef_ptr) 6819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 6829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project SIZEOF(my_coef_controller)); 6839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->coef = (struct jpeg_d_coef_controller *) coef; 6849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.start_input_pass = start_input_pass; 6859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.start_output_pass = start_output_pass; 6869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 6879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->coef_bits_latch = NULL; 6889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 6899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Create the coefficient buffer. */ 6919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (need_full_buffer) { 6929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 6939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Allocate a full-image virtual array for each component, */ 6949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* padded to a multiple of samp_factor DCT blocks in each direction. */ 6959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Note we ask for a pre-zeroed array. */ 6969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int ci, access_rows; 6979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_component_info *compptr; 6989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 6999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 7009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ci++, compptr++) { 7019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project access_rows = compptr->v_samp_factor; 7029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef BLOCK_SMOOTHING_SUPPORTED 7039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If block smoothing could be used, need a bigger window */ 7049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progressive_mode) 7059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project access_rows *= 3; 7069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 7079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->whole_image[ci] = (*cinfo->mem->request_virt_barray) 7089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ((j_common_ptr) cinfo, JPOOL_IMAGE, TRUE, 7099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) jround_up((long) compptr->width_in_blocks, 7109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (long) compptr->h_samp_factor), 7119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) jround_up((long) compptr->height_in_blocks, 7129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (long) compptr->v_samp_factor), 7139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (JDIMENSION) access_rows); 7149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.consume_data = consume_data; 7169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.decompress_data = decompress_data; 7179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.coef_arrays = coef->whole_image; /* link to virtual arrays */ 7189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 7199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_NOT_COMPILED); 7209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif 7219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else { 7229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We only need a single-MCU buffer. */ 7239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JBLOCKROW buffer; 7249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int i; 7259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 7269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project buffer = (JBLOCKROW) 7279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 7289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project D_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 7299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (i = 0; i < D_MAX_BLOCKS_IN_MCU; i++) { 7309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->MCU_buffer[i] = buffer + i; 7319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.consume_data = dummy_consume_data; 7339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.decompress_data = decompress_onepass; 7349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project coef->pub.coef_arrays = NULL; /* flag for no virtual arrays */ 7359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 7369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 737