The Tor Browser: media/libjpeg/jcinit.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * jcinit.c

     3  *

     4  * Copyright (C) 1991-1997, Thomas G. Lane.

     5  * This file is part of the Independent JPEG Group's software.

     6  * For conditions of distribution and use, see the accompanying README file.

     7  *

     8  * This file contains initialization logic for the JPEG compressor.

     9  * This routine is in charge of selecting the modules to be executed and

    10  * making an initialization call to each one.

    11  *

    12  * Logically, this code belongs in jcmaster.c.  It's split out because

    13  * linking this routine implies linking the entire compression library.

    14  * For a transcoding-only application, we want to be able to use jcmaster.c

    15  * without linking in the whole library.

    16  */

    18 #define JPEG_INTERNALS

    19 #include "jinclude.h"

    20 #include "jpeglib.h"

    23 /*

    24  * Master selection of compression modules.

    25  * This is done once at the start of processing an image.  We determine

    26  * which modules will be used and give them appropriate initialization calls.

    27  */

    29 GLOBAL(void)

    30 jinit_compress_master (j_compress_ptr cinfo)

    31 {

    32   /* Initialize master control (includes parameter checking/processing) */

    33   jinit_c_master_control(cinfo, FALSE /* full compression */);

    35   /* Preprocessing */

    36   if (! cinfo->raw_data_in) {

    37     jinit_color_converter(cinfo);

    38     jinit_downsampler(cinfo);

    39     jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);

    40   }

    41   /* Forward DCT */

    42   jinit_forward_dct(cinfo);

    43   /* Entropy encoding: either Huffman or arithmetic coding. */

    44   if (cinfo->arith_code) {

    45 #ifdef C_ARITH_CODING_SUPPORTED

    46     jinit_arith_encoder(cinfo);

    47 #else

    48     ERREXIT(cinfo, JERR_ARITH_NOTIMPL);

    49 #endif

    50   } else {

    51     if (cinfo->progressive_mode) {

    52 #ifdef C_PROGRESSIVE_SUPPORTED

    53       jinit_phuff_encoder(cinfo);

    54 #else

    55       ERREXIT(cinfo, JERR_NOT_COMPILED);

    56 #endif

    57     } else

    58       jinit_huff_encoder(cinfo);

    59   }

    61   /* Need a full-image coefficient buffer in any multi-pass mode. */

    62   jinit_c_coef_controller(cinfo,

    63 		(boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));

    64   jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);

    66   jinit_marker_writer(cinfo);

    68   /* We can now tell the memory manager to allocate virtual arrays. */

    69   (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);

    71   /* Write the datastream header (SOI) immediately.

    72    * Frame and scan headers are postponed till later.

    73    * This lets application insert special markers after the SOI.

    74    */

    75   (*cinfo->marker->write_file_header) (cinfo);

    76 }

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