jcapimin.cpp File Reference

#include "jinclude.h"
#include "jpeglib.h"

Include dependency graph for jcapimin.cpp:

Macros
#define	JPEG_INTERNALS

Functions
void	jpeg_CreateCompress (j_compress_ptr cinfo, int version, size_t structsize)
void	jpeg_destroy_compress (j_compress_ptr cinfo)
void	jpeg_abort_compress (j_compress_ptr cinfo)
void	jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
void	jpeg_finish_compress (j_compress_ptr cinfo)
void	jpeg_write_marker (j_compress_ptr cinfo, int marker, const JOCTET *dataptr, unsigned int datalen)
void	jpeg_write_m_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
void	jpeg_write_m_byte (j_compress_ptr cinfo, int val)
void	jpeg_write_tables (j_compress_ptr cinfo)

Macro Definition Documentation

#define JPEG_INTERNALS

Function Documentation

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;
}

void jpeg_destroy_compress

(

j_compress_ptr

cinfo

)

{
  jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
}

void jpeg_abort_compress

(

j_compress_ptr

cinfo

)

{
  jpeg_abort((j_common_ptr) cinfo); /* use common routine */
}

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;
  }
}

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->coef->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);
}

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++;
  }
}

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);
}

void jpeg_write_m_byte	(	j_compress_ptr	cinfo,
		int	val
	)

{
  (*cinfo->marker->write_marker_byte) (cinfo, val);
}

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().
   */
}