jdapistd.c revision 3147fbe7688fc353e6ae03825a37cf101a4ee01d
19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jdapistd.c 39f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 49f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Copyright (C) 1994-1996, 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 application interface code for the decompression half 99f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * of the JPEG library. These are the "standard" API routines that are 109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * used in the normal full-decompression case. They are not used by a 119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * transcoding-only application. Note that if an application links in 129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_start_decompress, it will end up linking in the entire decompressor. 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We thus must separate this file from jdapimin.c to avoid linking the 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * whole decompression library into a transcoder. 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 229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Forward declarations */ 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boolean) output_pass_setup JPP((j_decompress_ptr cinfo)); 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Decompression initialization. 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_read_header must be completed before calling this. 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If a multipass operating mode was selected, this will do all but the 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * last pass, and thus may take a great deal of time. 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Returns FALSE if suspended. The return value need be inspected only if 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a suspending data source is used. 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(boolean) 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_start_decompress (j_decompress_ptr cinfo) 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state == DSTATE_READY) { 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* First call: initialize master control, select active modules */ 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jinit_master_decompress(cinfo); 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->buffered_image) { 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* No more work here; expecting jpeg_start_output next */ 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = DSTATE_BUFIMAGE; 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = DSTATE_PRELOAD; 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state == DSTATE_PRELOAD) { 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If file has multiple scans, absorb them all into the coef buffer */ 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->inputctl->has_multiple_scans) { 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project for (;;) { 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project int retcode; 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Absorb some more input */ 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project retcode = (*cinfo->inputctl->consume_input) (cinfo); 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (retcode == JPEG_SUSPENDED) 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (retcode == JPEG_REACHED_EOI) 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project break; 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Advance progress counter if appropriate */ 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL && 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* jdmaster underestimated number of scans; ratchet up one scan */ 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_NOT_COMPILED); 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* D_MULTISCAN_FILES_SUPPORTED */ 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scan_number = cinfo->input_scan_number; 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (cinfo->global_state != DSTATE_PRESCAN) 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Perform any dummy output passes, and set up for the final pass */ 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return output_pass_setup(cinfo); 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Set up for an output pass, and perform any dummy pass(es) needed. 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Common subroutine for jpeg_start_decompress and jpeg_start_output. 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Entry: global_state = DSTATE_PRESCAN only if previously suspended. 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Exit: If done, returns TRUE and sets global_state for proper output mode. 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * If suspended, returns FALSE and sets global_state = DSTATE_PRESCAN. 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectLOCAL(boolean) 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectoutput_pass_setup (j_decompress_ptr cinfo) 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != DSTATE_PRESCAN) { 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* First call: do pass setup */ 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->prepare_for_output_pass) (cinfo); 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scanline = 0; 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = DSTATE_PRESCAN; 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Loop over any required dummy passes */ 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (cinfo->master->is_dummy_pass) { 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef QUANT_2PASS_SUPPORTED 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Crank through the dummy pass */ 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (cinfo->output_scanline < cinfo->output_height) { 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION last_scanline; 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) { 1119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_counter = (long) cinfo->output_scanline; 1129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit = (long) cinfo->output_height; 1139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 1149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Process some data */ 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project last_scanline = cinfo->output_scanline; 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->main->process_data) (cinfo, (JSAMPARRAY) NULL, 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project &cinfo->output_scanline, (JDIMENSION) 0); 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_scanline == last_scanline) 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; /* No progress made, must suspend */ 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Finish up dummy pass, and set up for another one */ 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->finish_output_pass) (cinfo); 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->prepare_for_output_pass) (cinfo); 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scanline = 0; 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#else 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_NOT_COMPILED); 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* QUANT_2PASS_SUPPORTED */ 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Ready for application to drive output pass through 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_read_scanlines or jpeg_read_raw_data. 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = cinfo->raw_data_out ? DSTATE_RAW_OK : DSTATE_SCANNING; 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Read some scanlines of data from the JPEG decompressor. 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The return value will be the number of lines actually read. 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This may be less than the number requested in several cases, 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * including bottom of image, data source suspension, and operating 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * modes that emit multiple scanlines at a time. 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: we warn about excess calls to jpeg_read_scanlines() since 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * this likely signals an application programmer error. However, 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * an oversize buffer (max_lines > scanlines remaining) is not an error. 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(JDIMENSION) 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_read_scanlines (j_decompress_ptr cinfo, JSAMPARRAY scanlines, 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION max_lines) 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION row_ctr; 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != DSTATE_SCANNING) 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_scanline >= cinfo->output_height) { 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project WARNMS(cinfo, JWRN_TOO_MUCH_DATA); 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; 1629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 1659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) { 1669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_counter = (long) cinfo->output_scanline; 1679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit = (long) cinfo->output_height; 1689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 1699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Process some data */ 1729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project row_ctr = 0; 1739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, max_lines); 1749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scanline += row_ctr; 1759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return row_ctr; 1769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 1773147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen/* 1783147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * Initialize the jpeg decoder to decompressing a rectangle with size of (width, height) 1793147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * and its upper-left corner located at (start_x, start_y). 1803147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * Align start_x and start_y to multiplies of iMCU width and height, respectively. 1813147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * Also, the new reader position will be returned in (start_x, start_y). 1823147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen */ 1833147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 1843147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph WenGLOBAL(void) 1853147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wenjpeg_init_read_tile_scanline(j_decompress_ptr cinfo, huffman_index *index, 1863147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int *start_x, int *start_y, int *width, int *height) 1873147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen{ 1883147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen // Calculates the boundary of iMCU 1893147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE; 1903147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int lines_per_iMCU_col = cinfo->max_h_samp_factor * DCTSIZE; 1913147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int row_offset = *start_y / lines_per_iMCU_row; 1923147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int col_left_boundary = ((*start_x / lines_per_iMCU_col) / index->MCU_sample_size) 1933147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * index->MCU_sample_size; 1943147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int col_right_boundary = (*start_x + *width + lines_per_iMCU_col - 1) / lines_per_iMCU_col; 1953147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 1963147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen *height = (*start_y - row_offset * lines_per_iMCU_row) + *height; 1973147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen *start_x = col_left_boundary * lines_per_iMCU_col; 1983147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen *start_y = row_offset * lines_per_iMCU_row; 1993147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->image_width = (col_right_boundary - col_left_boundary) * lines_per_iMCU_col; 2003147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->input_iMCU_row = row_offset; 2013147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->output_iMCU_row = row_offset; 2023147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2033147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen // Updates JPEG decoder parameter 2043147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen jinit_color_deconverter(cinfo); 2053147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen jpeg_calc_output_dimensions(cinfo); 2063147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen jinit_upsampler(cinfo); 2073147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen jpeg_decompress_per_scan_setup(cinfo); 2083147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->MCUs_per_row = col_right_boundary - col_left_boundary; 2093147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2103147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int sampleSize = cinfo->image_width / cinfo->output_width; 2113147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen *height /= sampleSize; 2123147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen *width = cinfo->output_width; 2133147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->output_scanline = lines_per_iMCU_row * row_offset / sampleSize; 2143147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen (*cinfo->master->prepare_for_output_pass) (cinfo); 2153147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen} 2163147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2173147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen/* 2183147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * Read a scanline from the current position. 2193147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * 2203147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * Return the number of lines actually read. 2213147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen */ 2223147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2233147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph WenGLOBAL(JDIMENSION) 2243147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wenjpeg_read_tile_scanline (j_decompress_ptr cinfo, huffman_index *index, 2253147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen JSAMPARRAY scanlines, int start_x, int start_y, int width, int height) 2263147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen{ 2273147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen // Calculates the boundary of iMCU 2283147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE; 2293147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int lines_per_iMCU_col = cinfo->max_h_samp_factor * DCTSIZE; 2303147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int col_left_boundary = ((start_x / lines_per_iMCU_col) / index->MCU_sample_size) 2313147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen * index->MCU_sample_size; 2323147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int sampleSize = cinfo->image_width / cinfo->output_width; 2333147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2343147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen if (cinfo->output_scanline % (lines_per_iMCU_row / sampleSize) == 0) { 2353147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen // Set the read head to the next iMCU row 2363147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen cinfo->unread_marker = 0; 2373147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int iMCU_row_offset = cinfo->output_scanline / (lines_per_iMCU_row / sampleSize); 2383147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int offset_data_col_position = col_left_boundary / index->MCU_sample_size; 2393147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen huffman_offset_data *offset_data = 2403147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen &index->scan[0].offset[iMCU_row_offset][offset_data_col_position]; 2413147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2423147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen jpeg_configure_huffman_decoder(cinfo, 2433147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen offset_data->bitstream_offset, offset_data->prev_dc); 2443147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen } 2453147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen 2463147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen int row_ctr = jpeg_read_scanlines(cinfo, scanlines, 1); // Read one line 2473147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen return row_ctr; 2483147fbe7688fc353e6ae03825a37cf101a4ee01dJoseph Wen} 2499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Alternate entry point to read raw data. 2539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Processes exactly one iMCU row per call, unless suspended. 2549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(JDIMENSION) 2579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data, 2589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION max_lines) 2599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 2609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION lines_per_iMCU_row; 2619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != DSTATE_RAW_OK) 2639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 2649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->output_scanline >= cinfo->output_height) { 2659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project WARNMS(cinfo, JWRN_TOO_MUCH_DATA); 2669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; 2679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 2709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) { 2719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_counter = (long) cinfo->output_scanline; 2729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit = (long) cinfo->output_height; 2739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 2749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 2759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Verify that at least one iMCU row can be returned. */ 2779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lines_per_iMCU_row = cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size; 2789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (max_lines < lines_per_iMCU_row) 2799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BUFFER_SIZE); 2809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Decompress directly into user's buffer. */ 2829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->coef->decompress_data) (cinfo, data)) 2839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; /* suspension forced, can do nothing more */ 2849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* OK, we processed one iMCU row. */ 2869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scanline += lines_per_iMCU_row; 2879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return lines_per_iMCU_row; 2889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 2899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* Additional entry points for buffered-image mode. */ 2929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#ifdef D_MULTISCAN_FILES_SUPPORTED 2949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 2969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Initialize for an output pass in buffered-image mode. 2979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 2989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 2999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(boolean) 3009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_start_output (j_decompress_ptr cinfo, int scan_number) 3019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != DSTATE_BUFIMAGE && 3039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state != DSTATE_PRESCAN) 3049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 3059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Limit scan number to valid range */ 3069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (scan_number <= 0) 3079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project scan_number = 1; 3089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->inputctl->eoi_reached && 3099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project scan_number > cinfo->input_scan_number) 3109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project scan_number = cinfo->input_scan_number; 3119f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->output_scan_number = scan_number; 3129f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Perform any dummy output passes, and set up for the real pass */ 3139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return output_pass_setup(cinfo); 3149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3159f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 3189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Finish up after an output pass in buffered-image mode. 3199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 3209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Returns FALSE if suspended. The return value need be inspected only if 3219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * a suspending data source is used. 3229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 3239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(boolean) 3259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_finish_output (j_decompress_ptr cinfo) 3269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 3279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((cinfo->global_state == DSTATE_SCANNING || 3289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state == DSTATE_RAW_OK) && cinfo->buffered_image) { 3299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Terminate this pass. */ 3309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* We do not require the whole pass to have been completed. */ 3319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->finish_output_pass) (cinfo); 3329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = DSTATE_BUFPOST; 3339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } else if (cinfo->global_state != DSTATE_BUFPOST) { 3349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* BUFPOST = repeat call after a suspension, anything else is error */ 3359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 3369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Read markers looking for SOS or EOI */ 3389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project while (cinfo->input_scan_number <= cinfo->output_scan_number && 3399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ! cinfo->inputctl->eoi_reached) { 3409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if ((*cinfo->inputctl->consume_input) (cinfo) == JPEG_SUSPENDED) 3419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return FALSE; /* Suspend, come back later */ 3429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 3439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = DSTATE_BUFIMAGE; 3449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return TRUE; 3459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 3469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 3479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project#endif /* D_MULTISCAN_FILES_SUPPORTED */ 348