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65 lines
2.1 KiB
65 lines
2.1 KiB
/* |
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* jcinit.c |
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* |
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* Copyright (C) 1991-1997, Thomas G. Lane. |
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* This file is part of the Independent JPEG Group's software. |
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* For conditions of distribution and use, see the accompanying README file. |
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* |
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* This file contains initialization logic for the JPEG compressor. |
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* This routine is in charge of selecting the modules to be executed and |
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* making an initialization call to each one. |
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* |
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* Logically, this code belongs in jcmaster.c. It's split out because |
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* linking this routine implies linking the entire compression library. |
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* For a transcoding-only application, we want to be able to use jcmaster.c |
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* without linking in the whole library. |
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*/ |
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#define JPEG_INTERNALS |
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#include "jinclude.h" |
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#include "jpeglib.h" |
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/* |
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* Master selection of compression modules. |
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* This is done once at the start of processing an image. We determine |
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* which modules will be used and give them appropriate initialization calls. |
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*/ |
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GLOBAL(void) |
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jinit_compress_master (j_compress_ptr cinfo) |
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{ |
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/* Initialize master control (includes parameter checking/processing) */ |
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jinit_c_master_control(cinfo, FALSE /* full compression */); |
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/* Preprocessing */ |
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if (! cinfo->raw_data_in) { |
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jinit_color_converter(cinfo); |
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jinit_downsampler(cinfo); |
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jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */); |
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} |
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/* Forward DCT */ |
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jinit_forward_dct(cinfo); |
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/* Entropy encoding: either Huffman or arithmetic coding. */ |
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if (cinfo->arith_code) |
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jinit_arith_encoder(cinfo); |
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else { |
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jinit_huff_encoder(cinfo); |
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} |
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/* Need a full-image coefficient buffer in any multi-pass mode. */ |
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jinit_c_coef_controller(cinfo, |
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(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding)); |
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jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */); |
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jinit_marker_writer(cinfo); |
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/* We can now tell the memory manager to allocate virtual arrays. */ |
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(*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); |
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/* Write the datastream header (SOI) immediately. |
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* Frame and scan headers are postponed till later. |
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* This lets application insert special markers after the SOI. |
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*/ |
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(*cinfo->marker->write_file_header) (cinfo); |
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}
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