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src/Source/LibJPEG/jpegtran.c  view on Meta::CPAN

/*
 * jpegtran.c
 *
 * Copyright (C) 1995-2013, Thomas G. Lane, Guido Vollbeding.
 * 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 a command-line user interface for JPEG transcoding.
 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
 * lossless transcoding between different JPEG file formats.  It also
 * provides some lossless and sort-of-lossless transformations of JPEG data.
 */

#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
#include "transupp.h"		/* Support routines for jpegtran */
#include "jversion.h"		/* for version message */

#ifdef USE_CCOMMAND		/* command-line reader for Macintosh */
#ifdef __MWERKS__
#include <SIOUX.h>              /* Metrowerks needs this */
#include <console.h>		/* ... and this */
#endif
#ifdef THINK_C
#include <console.h>		/* Think declares it here */
#endif
#endif


/*
 * Argument-parsing code.
 * The switch parser is designed to be useful with DOS-style command line
 * syntax, ie, intermixed switches and file names, where only the switches
 * to the left of a given file name affect processing of that file.
 * The main program in this file doesn't actually use this capability...
 */


static const char * progname;	/* program name for error messages */
static char * outfilename;	/* for -outfile switch */
static char * scaleoption;	/* -scale switch */
static JCOPY_OPTION copyoption;	/* -copy switch */
static jpeg_transform_info transformoption; /* image transformation options */


LOCAL(void)
usage (void)
/* complain about bad command line */
{
  fprintf(stderr, "usage: %s [switches] ", progname);
#ifdef TWO_FILE_COMMANDLINE
  fprintf(stderr, "inputfile outputfile\n");
#else
  fprintf(stderr, "[inputfile]\n");
#endif

  fprintf(stderr, "Switches (names may be abbreviated):\n");
  fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
  fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
  fprintf(stderr, "  -copy all      Copy all extra markers\n");
#ifdef ENTROPY_OPT_SUPPORTED
  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
#endif
#ifdef C_PROGRESSIVE_SUPPORTED
  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
#endif
  fprintf(stderr, "Switches for modifying the image:\n");
#if TRANSFORMS_SUPPORTED
  fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
  fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
  fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
  fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
  fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
#endif
  fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
#if TRANSFORMS_SUPPORTED
  fprintf(stderr, "  -transpose     Transpose image\n");
  fprintf(stderr, "  -transverse    Transverse transpose image\n");
  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
  fprintf(stderr, "  -wipe WxH+X+Y  Wipe (gray out) a rectangular subarea\n");
#endif
  fprintf(stderr, "Switches for advanced users:\n");
#ifdef C_ARITH_CODING_SUPPORTED
  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
#endif
  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
  fprintf(stderr, "  -outfile name  Specify name for output file\n");
  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
  fprintf(stderr, "Switches for wizards:\n");
#ifdef C_MULTISCAN_FILES_SUPPORTED
  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");

src/Source/LibJPEG/jpegtran.c  view on Meta::CPAN

  jvirt_barray_ptr * src_coef_arrays;
  jvirt_barray_ptr * dst_coef_arrays;
  int file_index;
  /* We assume all-in-memory processing and can therefore use only a
   * single file pointer for sequential input and output operation. 
   */
  FILE * fp;

  /* On Mac, fetch a command line. */
#ifdef USE_CCOMMAND
  argc = ccommand(&argv);
#endif

  progname = argv[0];
  if (progname == NULL || progname[0] == 0)
    progname = "jpegtran";	/* in case C library doesn't provide it */

  /* Initialize the JPEG decompression object with default error handling. */
  srcinfo.err = jpeg_std_error(&jsrcerr);
  jpeg_create_decompress(&srcinfo);
  /* Initialize the JPEG compression object with default error handling. */
  dstinfo.err = jpeg_std_error(&jdsterr);
  jpeg_create_compress(&dstinfo);

  /* Now safe to enable signal catcher.
   * Note: we assume only the decompression object will have virtual arrays.
   */
#ifdef NEED_SIGNAL_CATCHER
  enable_signal_catcher((j_common_ptr) &srcinfo);
#endif

  /* Scan command line to find file names.
   * It is convenient to use just one switch-parsing routine, but the switch
   * values read here are mostly ignored; we will rescan the switches after
   * opening the input file.  Also note that most of the switches affect the
   * destination JPEG object, so we parse into that and then copy over what
   * needs to affects the source too.
   */

  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
  jsrcerr.trace_level = jdsterr.trace_level;
  srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;

#ifdef TWO_FILE_COMMANDLINE
  /* Must have either -outfile switch or explicit output file name */
  if (outfilename == NULL) {
    if (file_index != argc-2) {
      fprintf(stderr, "%s: must name one input and one output file\n",
	      progname);
      usage();
    }
    outfilename = argv[file_index+1];
  } else {
    if (file_index != argc-1) {
      fprintf(stderr, "%s: must name one input and one output file\n",
	      progname);
      usage();
    }
  }
#else
  /* Unix style: expect zero or one file name */
  if (file_index < argc-1) {
    fprintf(stderr, "%s: only one input file\n", progname);
    usage();
  }
#endif /* TWO_FILE_COMMANDLINE */

  /* Open the input file. */
  if (file_index < argc) {
    if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
      fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
      exit(EXIT_FAILURE);
    }
  } else {
    /* default input file is stdin */
    fp = read_stdin();
  }

#ifdef PROGRESS_REPORT
  start_progress_monitor((j_common_ptr) &dstinfo, &progress);
#endif

  /* Specify data source for decompression */
  jpeg_stdio_src(&srcinfo, fp);

  /* Enable saving of extra markers that we want to copy */
  jcopy_markers_setup(&srcinfo, copyoption);

  /* Read file header */
  (void) jpeg_read_header(&srcinfo, TRUE);

  /* Adjust default decompression parameters */
  if (scaleoption != NULL)
    if (sscanf(scaleoption, "%u/%u",
	&srcinfo.scale_num, &srcinfo.scale_denom) < 1)
      usage();

  /* Any space needed by a transform option must be requested before
   * jpeg_read_coefficients so that memory allocation will be done right.
   */
#if TRANSFORMS_SUPPORTED
  /* Fail right away if -perfect is given and transformation is not perfect.
   */
  if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
    fprintf(stderr, "%s: transformation is not perfect\n", progname);
    exit(EXIT_FAILURE);
  }
#endif

  /* Read source file as DCT coefficients */
  src_coef_arrays = jpeg_read_coefficients(&srcinfo);

  /* Initialize destination compression parameters from source values */
  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);

  /* Adjust destination parameters if required by transform options;
   * also find out which set of coefficient arrays will hold the output.
   */
#if TRANSFORMS_SUPPORTED
  dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
						 src_coef_arrays,