1*7dd7cddfSDavid du Colombier /* 2*7dd7cddfSDavid du Colombier * jcinit.c 3*7dd7cddfSDavid du Colombier * 4*7dd7cddfSDavid du Colombier * Copyright (C) 1991-1996, Thomas G. Lane. 5*7dd7cddfSDavid du Colombier * This file is part of the Independent JPEG Group's software. 6*7dd7cddfSDavid du Colombier * For conditions of distribution and use, see the accompanying README file. 7*7dd7cddfSDavid du Colombier * 8*7dd7cddfSDavid du Colombier * This file contains initialization logic for the JPEG compressor. 9*7dd7cddfSDavid du Colombier * This routine is in charge of selecting the modules to be executed and 10*7dd7cddfSDavid du Colombier * making an initialization call to each one. 11*7dd7cddfSDavid du Colombier * 12*7dd7cddfSDavid du Colombier * Logically, this code belongs in jcmaster.c. It's split out because 13*7dd7cddfSDavid du Colombier * linking this routine implies linking the entire compression library. 14*7dd7cddfSDavid du Colombier * For a transcoding-only application, we want to be able to use jcmaster.c 15*7dd7cddfSDavid du Colombier * without linking in the whole library. 16*7dd7cddfSDavid du Colombier */ 17*7dd7cddfSDavid du Colombier 18*7dd7cddfSDavid du Colombier #define JPEG_INTERNALS 19*7dd7cddfSDavid du Colombier #include "jinclude.h" 20*7dd7cddfSDavid du Colombier #include "jpeglib.h" 21*7dd7cddfSDavid du Colombier 22*7dd7cddfSDavid du Colombier 23*7dd7cddfSDavid du Colombier /* 24*7dd7cddfSDavid du Colombier * Master selection of compression modules. 25*7dd7cddfSDavid du Colombier * This is done once at the start of processing an image. We determine 26*7dd7cddfSDavid du Colombier * which modules will be used and give them appropriate initialization calls. 27*7dd7cddfSDavid du Colombier */ 28*7dd7cddfSDavid du Colombier 29*7dd7cddfSDavid du Colombier GLOBAL(void) 30*7dd7cddfSDavid du Colombier jinit_compress_master (j_compress_ptr cinfo) 31*7dd7cddfSDavid du Colombier { 32*7dd7cddfSDavid du Colombier /* Initialize master control (includes parameter checking/processing) */ 33*7dd7cddfSDavid du Colombier jinit_c_master_control(cinfo, FALSE /* full compression */); 34*7dd7cddfSDavid du Colombier 35*7dd7cddfSDavid du Colombier /* Preprocessing */ 36*7dd7cddfSDavid du Colombier if (! cinfo->raw_data_in) { 37*7dd7cddfSDavid du Colombier jinit_color_converter(cinfo); 38*7dd7cddfSDavid du Colombier jinit_downsampler(cinfo); 39*7dd7cddfSDavid du Colombier jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); 40*7dd7cddfSDavid du Colombier } 41*7dd7cddfSDavid du Colombier /* Forward DCT */ 42*7dd7cddfSDavid du Colombier jinit_forward_dct(cinfo); 43*7dd7cddfSDavid du Colombier /* Entropy encoding: either Huffman or arithmetic coding. */ 44*7dd7cddfSDavid du Colombier if (cinfo->arith_code) { 45*7dd7cddfSDavid du Colombier ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 46*7dd7cddfSDavid du Colombier } else { 47*7dd7cddfSDavid du Colombier if (cinfo->progressive_mode) { 48*7dd7cddfSDavid du Colombier #ifdef C_PROGRESSIVE_SUPPORTED 49*7dd7cddfSDavid du Colombier jinit_phuff_encoder(cinfo); 50*7dd7cddfSDavid du Colombier #else 51*7dd7cddfSDavid du Colombier ERREXIT(cinfo, JERR_NOT_COMPILED); 52*7dd7cddfSDavid du Colombier #endif 53*7dd7cddfSDavid du Colombier } else 54*7dd7cddfSDavid du Colombier jinit_huff_encoder(cinfo); 55*7dd7cddfSDavid du Colombier } 56*7dd7cddfSDavid du Colombier 57*7dd7cddfSDavid du Colombier /* Need a full-image coefficient buffer in any multi-pass mode. */ 58*7dd7cddfSDavid du Colombier jinit_c_coef_controller(cinfo, 59*7dd7cddfSDavid du Colombier (cinfo->num_scans > 1 || cinfo->optimize_coding)); 60*7dd7cddfSDavid du Colombier jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); 61*7dd7cddfSDavid du Colombier 62*7dd7cddfSDavid du Colombier jinit_marker_writer(cinfo); 63*7dd7cddfSDavid du Colombier 64*7dd7cddfSDavid du Colombier /* We can now tell the memory manager to allocate virtual arrays. */ 65*7dd7cddfSDavid du Colombier (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 66*7dd7cddfSDavid du Colombier 67*7dd7cddfSDavid du Colombier /* Write the datastream header (SOI) immediately. 68*7dd7cddfSDavid du Colombier * Frame and scan headers are postponed till later. 69*7dd7cddfSDavid du Colombier * This lets application insert special markers after the SOI. 70*7dd7cddfSDavid du Colombier */ 71*7dd7cddfSDavid du Colombier (*cinfo->marker->write_file_header) (cinfo); 72*7dd7cddfSDavid du Colombier } 73