19f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 29f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jcapistd.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 compression 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-compression 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_compress, it will end up linking in the entire compressor. 139f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We thus must separate this file from jcapimin.c to avoid linking the 149f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * whole compression 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/* 239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Compression initialization. 249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Before calling this, all parameters and a data destination must be set up. 259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * We require a write_all_tables parameter as a failsafe check when writing 279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * multiple datastreams from the same compression object. Since prior runs 289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * will have left all the tables marked sent_table=TRUE, a subsequent run 299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * would emit an abbreviated stream (no tables) by default. This may be what 309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * is wanted, but for safety's sake it should not be the default behavior: 319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * programmers should have to make a deliberate choice to emit abbreviated 329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * images. Therefore the documentation and examples should encourage people 339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * to pass write_all_tables=TRUE; then it will take active thought to do the 349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * wrong thing. 359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(void) 389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_start_compress (j_compress_ptr cinfo, boolean write_all_tables) 399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != CSTATE_START) 419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (write_all_tables) 449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jpeg_suppress_tables(cinfo, FALSE); /* mark all tables to be written */ 459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* (Re)initialize error mgr and destination modules */ 479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); 489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->dest->init_destination) (cinfo); 499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Perform master selection of active modules */ 509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project jinit_compress_master(cinfo); 519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Set up for the first pass */ 529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->prepare_for_pass) (cinfo); 539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Ready for application to drive first pass through jpeg_write_scanlines 549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * or jpeg_write_raw_data. 559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->next_scanline = 0; 579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->global_state = (cinfo->raw_data_in ? CSTATE_RAW_OK : CSTATE_SCANNING); 589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project/* 629f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Write some scanlines of data to the JPEG compressor. 639f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 649f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * The return value will be the number of lines actually written. 659f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * This should be less than the supplied num_lines only in case that 669f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * the data destination module has requested suspension of the compressor, 679f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * or if more than image_height scanlines are passed in. 689f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * 699f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Note: we warn about excess calls to jpeg_write_scanlines() since 709f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * this likely signals an application programmer error. However, 719f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * excess scanlines passed in the last valid call are *silently* ignored, 729f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * so that the application need not adjust num_lines for end-of-image 739f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * when using a multiple-scanline buffer. 749f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 759f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 769f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(JDIMENSION) 779f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines, 789f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION num_lines) 799f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 809f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION row_ctr, rows_left; 819f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 829f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != CSTATE_SCANNING) 839f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 849f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->next_scanline >= cinfo->image_height) 859f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project WARNMS(cinfo, JWRN_TOO_MUCH_DATA); 869f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 879f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 889f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) { 899f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_counter = (long) cinfo->next_scanline; 909f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit = (long) cinfo->image_height; 919f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 929f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 939f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 949f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Give master control module another chance if this is first call to 959f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_write_scanlines. This lets output of the frame/scan headers be 969f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * delayed so that application can write COM, etc, markers between 979f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_start_compress and jpeg_write_scanlines. 989f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 999f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->master->call_pass_startup) 1009f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->pass_startup) (cinfo); 1019f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1029f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Ignore any extra scanlines at bottom of image. */ 1039f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project rows_left = cinfo->image_height - cinfo->next_scanline; 1049f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num_lines > rows_left) 1059f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project num_lines = rows_left; 1069f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1079f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project row_ctr = 0; 1089f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->main->process_data) (cinfo, scanlines, &row_ctr, num_lines); 1099f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->next_scanline += row_ctr; 1109f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return row_ctr; 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 * Alternate entry point to write raw data. 1169f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * Processes exactly one iMCU row per call, unless suspended. 1179f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1189f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1199f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source ProjectGLOBAL(JDIMENSION) 1209f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Projectjpeg_write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data, 1219f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION num_lines) 1229f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project{ 1239f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project JDIMENSION lines_per_iMCU_row; 1249f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1259f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->global_state != CSTATE_RAW_OK) 1269f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 1279f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->next_scanline >= cinfo->image_height) { 1289f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project WARNMS(cinfo, JWRN_TOO_MUCH_DATA); 1299f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; 1309f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1319f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1329f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Call progress monitor hook if present */ 1339f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->progress != NULL) { 1349f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_counter = (long) cinfo->next_scanline; 1359f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->progress->pass_limit = (long) cinfo->image_height; 1369f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); 1379f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1389f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1399f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Give master control module another chance if this is first call to 1409f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_write_raw_data. This lets output of the frame/scan headers be 1419f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * delayed so that application can write COM, etc, markers between 1429f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project * jpeg_start_compress and jpeg_write_raw_data. 1439f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project */ 1449f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (cinfo->master->call_pass_startup) 1459f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project (*cinfo->master->pass_startup) (cinfo); 1469f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1479f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Verify that at least one iMCU row has been passed. */ 1489f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project lines_per_iMCU_row = cinfo->max_v_samp_factor * DCTSIZE; 1499f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (num_lines < lines_per_iMCU_row) 1509f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project ERREXIT(cinfo, JERR_BUFFER_SIZE); 1519f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1529f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* Directly compress the row. */ 1539f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project if (! (*cinfo->coef->compress_data) (cinfo, data)) { 1549f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* If compressor did not consume the whole row, suspend processing. */ 1559f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return 0; 1569f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project } 1579f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project 1589f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project /* OK, we processed one iMCU row. */ 1599f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project cinfo->next_scanline += lines_per_iMCU_row; 1609f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project return lines_per_iMCU_row; 1619f5d49a1588e438ae7ceabd0c94172117e3303aaThe Android Open Source Project} 162