text: #pragma region License (non-CC)
  
  // This source code contains the work of the Independent JPEG Group.
  // Please see accompanying notice in code comments and/or readme file
  // for the terms of distribution and use regarding this code.
  
  #pragma endregion
  
  /*
   * jcapimin.c
   *
   * Copyright (C) 1994-1998, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains application interface code for the compression half
   * of the JPEG library.  These are the "minimum" API routines that may be
   * needed in either the normal full-compression case or the transcoding-only
   * case.
   *
   * Most of the routines intended to be called directly by an application
   * are in this file or in jcapistd.c.  But also see jcparam.c for
   * parameter-setup helper routines, jcomapi.c for routines shared by
   * compression and decompression, and jctrans.c for the transcoding case.
   */
  
  #define JPEG_INTERNALS
  #include "jinclude16.h"
  #include "jpeglib16.h"
  
  
  /*
   * Initialization of a JPEG compression object.
   * The error manager must already be set up (in case memory manager fails).
   */
  
  GLOBAL(void)
  jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
  {
    int i;
  
    /* Guard against version mismatches between library and caller. */
    cinfo->mem = NULL;		/* so jpeg_destroy knows mem mgr not called */
    if (version != JPEG_LIB_VERSION)
      ERREXIT2(cinfo, JERR_BAD_LIB_VERSION, JPEG_LIB_VERSION, version);
    if (structsize != SIZEOF(struct jpeg_compress_struct))
      ERREXIT2(cinfo, JERR_BAD_STRUCT_SIZE, 
  	     (int) SIZEOF(struct jpeg_compress_struct), (int) structsize);
  
    /* For debugging purposes, we zero the whole master structure.
     * But the application has already set the err pointer, and may have set
     * client_data, so we have to save and restore those fields.
     * Note: if application hasn't set client_data, tools like Purify may
     * complain here.
     */
    {
      struct jpeg_error_mgr * err = cinfo->err;
      void * client_data = cinfo->client_data; /* ignore Purify complaint here */
      MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
      cinfo->err = err;
      cinfo->client_data = client_data;
    }
    cinfo->is_decompressor = FALSE;
  
    /* Initialize a memory manager instance for this object */
    jinit_memory_mgr((j_common_ptr) cinfo);
  
    /* Zero out pointers to permanent structures. */
    cinfo->progress = NULL;
    cinfo->dest = NULL;
  
    cinfo->comp_info = NULL;
  
    for (i = 0; i < NUM_QUANT_TBLS; i++)
      cinfo->quant_tbl_ptrs[i] = NULL;
  
    for (i = 0; i < NUM_HUFF_TBLS; i++) {
      cinfo->dc_huff_tbl_ptrs[i] = NULL;
      cinfo->ac_huff_tbl_ptrs[i] = NULL;
    }
  
    cinfo->script_space = NULL;
  
    cinfo->input_gamma = 1.0;	/* in case application forgets */
  
    /* OK, I'm ready */
    cinfo->global_state = CSTATE_START;
  }
  
  
  /*
   * Destruction of a JPEG compression object
   */
  
  GLOBAL(void)
  jpeg_destroy_compress (j_compress_ptr cinfo)
  {
    jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
  }
  
  
  /*
   * Abort processing of a JPEG compression operation,
   * but don't destroy the object itself.
   */
  
  GLOBAL(void)
  jpeg_abort_compress (j_compress_ptr cinfo)
  {
    jpeg_abort((j_common_ptr) cinfo); /* use common routine */
  }
  
  
  /*
   * Forcibly suppress or un-suppress all quantization and Huffman tables.
   * Marks all currently defined tables as already written (if suppress)
   * or not written (if !suppress).  This will control whether they get emitted
   * by a subsequent jpeg_start_compress call.
   *
   * This routine is exported for use by applications that want to produce
   * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
   * since it is called by jpeg_start_compress, we put it here --- otherwise
   * jcparam.o would be linked whether the application used it or not.
   */
  
  GLOBAL(void)
  jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
  {
    int i;
    JQUANT_TBL * qtbl;
    JHUFF_TBL * htbl;
  
    for (i = 0; i < NUM_QUANT_TBLS; i++) {
      if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
        qtbl->sent_table = suppress;
    }
  
    for (i = 0; i < NUM_HUFF_TBLS; i++) {
      if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
        htbl->sent_table = suppress;
      if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
        htbl->sent_table = suppress;
    }
  }
  
  
  /*
   * Finish JPEG compression.
   *
   * If a multipass operating mode was selected, this may do a great deal of
   * work including most of the actual output.
   */
  
  GLOBAL(void)
  jpeg_finish_compress (j_compress_ptr cinfo)
  {
    JDIMENSION iMCU_row;
  
    if (cinfo->global_state == CSTATE_SCANNING ||
        cinfo->global_state == CSTATE_RAW_OK) {
      /* Terminate first pass */
      if (cinfo->next_scanline < cinfo->image_height)
        ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
      (*cinfo->master->finish_pass) (cinfo);
    } else if (cinfo->global_state != CSTATE_WRCOEFS)
      ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
    /* Perform any remaining passes */
    while (! cinfo->master->is_last_pass) {
      (*cinfo->master->prepare_for_pass) (cinfo);
      for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
        if (cinfo->progress != NULL) {
  	cinfo->progress->pass_counter = (long) iMCU_row;
  	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
  	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
        }
        /* We bypass the main controller and invoke coef controller directly;
         * all work is being done from the coefficient buffer.
         */
        if (! (*cinfo->codec->compress_data) (cinfo, (JSAMPIMAGE) NULL))
  	ERREXIT(cinfo, JERR_CANT_SUSPEND);
      }
      (*cinfo->master->finish_pass) (cinfo);
    }
    /* Write EOI, do final cleanup */
    (*cinfo->marker->write_file_trailer) (cinfo);
    (*cinfo->dest->term_destination) (cinfo);
    /* We can use jpeg_abort to release memory and reset global_state */
    jpeg_abort((j_common_ptr) cinfo);
  }
  
  
  /*
   * Write a special marker.
   * This is only recommended for writing COM or APPn markers.
   * Must be called after jpeg_start_compress() and before
   * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
   */
  
  GLOBAL(void)
  jpeg_write_marker (j_compress_ptr cinfo, int marker,
  		   const JOCTET *dataptr, unsigned int datalen)
  {
    JMETHOD(void, write_marker_byte, (j_compress_ptr info, int val));
  
    if (cinfo->next_scanline != 0 ||
        (cinfo->global_state != CSTATE_SCANNING &&
         cinfo->global_state != CSTATE_RAW_OK &&
         cinfo->global_state != CSTATE_WRCOEFS))
      ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
  
    (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
    write_marker_byte = cinfo->marker->write_marker_byte;	/* copy for speed */
    while (datalen--) {
      (*write_marker_byte) (cinfo, *dataptr);
      dataptr++;
    }
  }
  
  /* Same, but piecemeal. */
  
  GLOBAL(void)
  jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
  {
    if (cinfo->next_scanline != 0 ||
        (cinfo->global_state != CSTATE_SCANNING &&
         cinfo->global_state != CSTATE_RAW_OK &&
         cinfo->global_state != CSTATE_WRCOEFS))
      ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
  
    (*cinfo->marker->write_marker_header) (cinfo, marker, datalen);
  }
  
  GLOBAL(void)
  jpeg_write_m_byte (j_compress_ptr cinfo, int val)
  {
    (*cinfo->marker->write_marker_byte) (cinfo, val);
  }
  
  
  /*
   * Alternate compression function: just write an abbreviated table file.
   * Before calling this, all parameters and a data destination must be set up.
   *
   * To produce a pair of files containing abbreviated tables and abbreviated
   * image data, one would proceed as follows:
   *
   *		initialize JPEG object
   *		set JPEG parameters
   *		set destination to table file
   *		jpeg_write_tables(cinfo);
   *		set destination to image file
   *		jpeg_start_compress(cinfo, FALSE);
   *		write data...
   *		jpeg_finish_compress(cinfo);
   *
   * jpeg_write_tables has the side effect of marking all tables written
   * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
   * will not re-emit the tables unless it is passed write_all_tables=TRUE.
   */
  
  GLOBAL(void)
  jpeg_write_tables (j_compress_ptr cinfo)
  {
    if (cinfo->global_state != CSTATE_START)
      ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
  
    /* (Re)initialize error mgr and destination modules */
    (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
    (*cinfo->dest->init_destination) (cinfo);
    /* Initialize the marker writer ... bit of a crock to do it here. */
    jinit_marker_writer(cinfo);
    /* Write them tables! */
    (*cinfo->marker->write_tables_only) (cinfo);
    /* And clean up. */
    (*cinfo->dest->term_destination) (cinfo);
    /*
     * In library releases up through v6a, we called jpeg_abort() here to free
     * any working memory allocated by the destination manager and marker
     * writer.  Some applications had a problem with that: they allocated space
     * of their own from the library memory manager, and didn't want it to go
     * away during write_tables.  So now we do nothing.  This will cause a
     * memory leak if an app calls write_tables repeatedly without doing a full
     * compression cycle or otherwise resetting the JPEG object.  However, that
     * seems less bad than unexpectedly freeing memory in the normal case.
     * An app that prefers the old behavior can call jpeg_abort for itself after
     * each call to jpeg_write_tables().
     */
  }
  