kc3-lang/libjpeg-turbo/src/rdswitch.c

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• Hash : e69dd40c
  Author :
  Date : 2024-01-23T13:26:41
  

  Reorganize source to make things easier to find
  
  - Move all libjpeg documentation, except for README.ijg, into the doc/
    subdirectory.
  
  - Move the TurboJPEG C API documentation from doc/html/ into
    doc/turbojpeg/.
  
  - Move all C source code and headers into a src/ subdirectory.
  
  - Move turbojpeg-jni.c into the java/ subdirectory.
  
  Referring to #226, there is no ideal solution to this problem.  A
  semantically ideal solution would have involved placing all source code,
  including the SIMD and Java source code, under src/ (or perhaps placing
  C library source code under lib/ and C test program source code under
  test/), all header files under include/, and all documentation under
  doc/.  However:
  
  - To me it makes more sense to have separate top-level directories for
    each language, since the SIMD extensions and the Java API are
    technically optional features.  src/ now contains only the code that
    is relevant to the core C API libraries and associated programs.
  - I didn't want to bury the java/ and simd/ directories or add a level
    of depth to them, since both directories already contain source code
    that is 3-4 levels deep.
  - I would prefer not to separate the header files from the C source
    code, because:
    1. It would be disruptive.  libjpeg and libjpeg-turbo have
       historically placed C source code and headers in the same
       directory, and people who are familiar with both projects (self
       included) are used to looking for the headers in the same directory
       as the C source code.
    2. In terms of how the headers are used internally in libjpeg-turbo,
       the distinction between public and private headers is a bit fuzzy.
  - It didn't make sense to separate the test source code from the library
    source code, since there is not a clear distinction in some cases.
    (For instance, the IJG image I/O functions are used by cjpeg and djpeg
    as well as by the TurboJPEG API.)
  
  This solution is minimally disruptive, since it keeps all C source code
  and headers together and keeps java/ and simd/ as top-level directories.
  It is a bit awkward, because java/ and simd/ technically contain source
  code, even though they are not under src/.  However, other solutions
  would have been more awkward for different reasons.
  
  Closes #226
  

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• src/rdswitch.c

• /*
   * rdswitch.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1996, Thomas G. Lane.
   * libjpeg-turbo Modifications:
   * Copyright (C) 2010, 2018, 2022, D. R. Commander.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains routines to process some of cjpeg's more complicated
   * command-line switches.  Switches processed here are:
   *      -qtables file           Read quantization tables from text file
   *      -scans file             Read scan script from text file
   *      -quality N[,N,...]      Set quality ratings
   *      -qslots N[,N,...]       Set component quantization table selectors
   *      -sample HxV[,HxV,...]   Set component sampling factors
   */
  
  #ifdef _MSC_VER
  #define _CRT_SECURE_NO_DEPRECATE
  #endif
  
  #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  #include <ctype.h>              /* to declare isdigit(), isspace() */
  
  
  LOCAL(int)
  text_getc(FILE *file)
  /* Read next char, skipping over any comments (# to end of line) */
  /* A comment/newline sequence is returned as a newline */
  {
    register int ch;
  
    ch = getc(file);
    if (ch == '#') {
      do {
        ch = getc(file);
      } while (ch != '\n' && ch != EOF);
    }
    return ch;
  }
  
  
  LOCAL(boolean)
  read_text_integer(FILE *file, long *result, int *termchar)
  /* Read an unsigned decimal integer from a file, store it in result */
  /* Reads one trailing character after the integer; returns it in termchar */
  {
    register int ch;
    register long val;
  
    /* Skip any leading whitespace, detect EOF */
    do {
      ch = text_getc(file);
      if (ch == EOF) {
        *termchar = ch;
        return FALSE;
      }
    } while (isspace(ch));
  
    if (!isdigit(ch)) {
      *termchar = ch;
      return FALSE;
    }
  
    val = ch - '0';
    while ((ch = text_getc(file)) != EOF) {
      if (!isdigit(ch))
        break;
      val *= 10;
      val += ch - '0';
    }
    *result = val;
    *termchar = ch;
    return TRUE;
  }
  
  
  #if JPEG_LIB_VERSION < 70
  static int q_scale_factor[NUM_QUANT_TBLS] = { 100, 100, 100, 100 };
  #endif
  
  GLOBAL(boolean)
  read_quant_tables(j_compress_ptr cinfo, char *filename, boolean force_baseline)
  /* Read a set of quantization tables from the specified file.
   * The file is plain ASCII text: decimal numbers with whitespace between.
   * Comments preceded by '#' may be included in the file.
   * There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
   * The tables are implicitly numbered 0,1,etc.
   * NOTE: does not affect the qslots mapping, which will default to selecting
   * table 0 for luminance (or primary) components, 1 for chrominance components.
   * You must use -qslots if you want a different component->table mapping.
   */
  {
    FILE *fp;
    int tblno, i, termchar;
    long val;
    unsigned int table[DCTSIZE2];
  
    if ((fp = fopen(filename, "r")) == NULL) {
      fprintf(stderr, "Can't open table file %s\n", filename);
      return FALSE;
    }
    tblno = 0;
  
    while (read_text_integer(fp, &val, &termchar)) { /* read 1st element of table */
      if (tblno >= NUM_QUANT_TBLS) {
        fprintf(stderr, "Too many tables in file %s\n", filename);
        fclose(fp);
        return FALSE;
      }
      table[0] = (unsigned int)val;
      for (i = 1; i < DCTSIZE2; i++) {
        if (!read_text_integer(fp, &val, &termchar)) {
          fprintf(stderr, "Invalid table data in file %s\n", filename);
          fclose(fp);
          return FALSE;
        }
        table[i] = (unsigned int)val;
      }
  #if JPEG_LIB_VERSION >= 70
      jpeg_add_quant_table(cinfo, tblno, table, cinfo->q_scale_factor[tblno],
                           force_baseline);
  #else
      jpeg_add_quant_table(cinfo, tblno, table, q_scale_factor[tblno],
                           force_baseline);
  #endif
      tblno++;
    }
  
    if (termchar != EOF) {
      fprintf(stderr, "Non-numeric data in file %s\n", filename);
      fclose(fp);
      return FALSE;
    }
  
    fclose(fp);
    return TRUE;
  }
  
  
  #ifdef C_MULTISCAN_FILES_SUPPORTED
  
  LOCAL(boolean)
  read_scan_integer(FILE *file, long *result, int *termchar)
  /* Variant of read_text_integer that always looks for a non-space termchar;
   * this simplifies parsing of punctuation in scan scripts.
   */
  {
    register int ch;
  
    if (!read_text_integer(file, result, termchar))
      return FALSE;
    ch = *termchar;
    while (ch != EOF && isspace(ch))
      ch = text_getc(file);
    if (isdigit(ch)) {            /* oops, put it back */
      if (ungetc(ch, file) == EOF)
        return FALSE;
      ch = ' ';
    } else {
      /* Any separators other than ';' and ':' are ignored;
       * this allows user to insert commas, etc, if desired.
       */
      if (ch != EOF && ch != ';' && ch != ':')
        ch = ' ';
    }
    *termchar = ch;
    return TRUE;
  }
  
  
  GLOBAL(boolean)
  read_scan_script(j_compress_ptr cinfo, char *filename)
  /* Read a scan script from the specified text file.
   * Each entry in the file defines one scan to be emitted.
   * Entries are separated by semicolons ';'.
   * An entry contains one to four component indexes,
   * optionally followed by a colon ':' and four progressive-JPEG parameters.
   * The component indexes denote which component(s) are to be transmitted
   * in the current scan.  The first component has index 0.
   * Sequential JPEG is used if the progressive-JPEG parameters are omitted.
   * The file is free format text: any whitespace may appear between numbers
   * and the ':' and ';' punctuation marks.  Also, other punctuation (such
   * as commas or dashes) can be placed between numbers if desired.
   * Comments preceded by '#' may be included in the file.
   * Note: we do very little validity checking here;
   * jcmaster.c will validate the script parameters.
   */
  {
    FILE *fp;
    int scanno, ncomps, termchar;
    long val;
    jpeg_scan_info *scanptr;
  #define MAX_SCANS  100          /* quite arbitrary limit */
    jpeg_scan_info scans[MAX_SCANS];
  
    if ((fp = fopen(filename, "r")) == NULL) {
      fprintf(stderr, "Can't open scan definition file %s\n", filename);
      return FALSE;
    }
    scanptr = scans;
    scanno = 0;
  
    while (read_scan_integer(fp, &val, &termchar)) {
      if (scanno >= MAX_SCANS) {
        fprintf(stderr, "Too many scans defined in file %s\n", filename);
        fclose(fp);
        return FALSE;
      }
      scanptr->component_index[0] = (int)val;
      ncomps = 1;
      while (termchar == ' ') {
        if (ncomps >= MAX_COMPS_IN_SCAN) {
          fprintf(stderr, "Too many components in one scan in file %s\n",
                  filename);
          fclose(fp);
          return FALSE;
        }
        if (!read_scan_integer(fp, &val, &termchar))
          goto bogus;
        scanptr->component_index[ncomps] = (int)val;
        ncomps++;
      }
      scanptr->comps_in_scan = ncomps;
      if (termchar == ':') {
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Ss = (int)val;
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Se = (int)val;
        if (!read_scan_integer(fp, &val, &termchar) || termchar != ' ')
          goto bogus;
        scanptr->Ah = (int)val;
        if (!read_scan_integer(fp, &val, &termchar))
          goto bogus;
        scanptr->Al = (int)val;
      } else {
        /* set non-progressive parameters */
        scanptr->Ss = 0;
        scanptr->Se = DCTSIZE2 - 1;
        scanptr->Ah = 0;
        scanptr->Al = 0;
      }
      if (termchar != ';' && termchar != EOF) {
  bogus:
        fprintf(stderr, "Invalid scan entry format in file %s\n", filename);
        fclose(fp);
        return FALSE;
      }
      scanptr++, scanno++;
    }
  
    if (termchar != EOF) {
      fprintf(stderr, "Non-numeric data in file %s\n", filename);
      fclose(fp);
      return FALSE;
    }
  
    if (scanno > 0) {
      /* Stash completed scan list in cinfo structure.
       * NOTE: for cjpeg's use, JPOOL_IMAGE is the right lifetime for this data,
       * but if you want to compress multiple images you'd want JPOOL_PERMANENT.
       */
      scanptr = (jpeg_scan_info *)
        (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
                                    scanno * sizeof(jpeg_scan_info));
      memcpy(scanptr, scans, scanno * sizeof(jpeg_scan_info));
      cinfo->scan_info = scanptr;
      cinfo->num_scans = scanno;
    }
  
    fclose(fp);
    return TRUE;
  }
  
  #endif /* C_MULTISCAN_FILES_SUPPORTED */
  
  
  #if JPEG_LIB_VERSION < 70
  /* These are the sample quantization tables given in Annex K (Clause K.1) of
   * Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994.
   * The spec says that the values given produce "good" quality, and
   * when divided by 2, "very good" quality.
   */
  static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
    16,  11,  10,  16,  24,  40,  51,  61,
    12,  12,  14,  19,  26,  58,  60,  55,
    14,  13,  16,  24,  40,  57,  69,  56,
    14,  17,  22,  29,  51,  87,  80,  62,
    18,  22,  37,  56,  68, 109, 103,  77,
    24,  35,  55,  64,  81, 104, 113,  92,
    49,  64,  78,  87, 103, 121, 120, 101,
    72,  92,  95,  98, 112, 100, 103,  99
  };
  static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
    17,  18,  24,  47,  99,  99,  99,  99,
    18,  21,  26,  66,  99,  99,  99,  99,
    24,  26,  56,  99,  99,  99,  99,  99,
    47,  66,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99,
    99,  99,  99,  99,  99,  99,  99,  99
  };
  
  
  LOCAL(void)
  jpeg_default_qtables(j_compress_ptr cinfo, boolean force_baseline)
  {
    jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, q_scale_factor[0],
                         force_baseline);
    jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, q_scale_factor[1],
                         force_baseline);
  }
  #endif
  
  
  GLOBAL(boolean)
  set_quality_ratings(j_compress_ptr cinfo, char *arg, boolean force_baseline)
  /* Process a quality-ratings parameter string, of the form
   *     N[,N,...]
   * If there are more q-table slots than parameters, the last value is replicated.
   */
  {
    int val = 75;                 /* default value */
    int tblno;
    char ch;
  
    for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
      if (*arg) {
        ch = ',';                 /* if not set by sscanf, will be ',' */
        if (sscanf(arg, "%d%c", &val, &ch) < 1)
          return FALSE;
        if (ch != ',')            /* syntax check */
          return FALSE;
        /* Convert user 0-100 rating to percentage scaling */
  #if JPEG_LIB_VERSION >= 70
        cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #else
        q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #endif
        while (*arg && *arg++ != ','); /* advance to next segment of arg
                                          string */
      } else {
        /* reached end of parameter, set remaining factors to last value */
  #if JPEG_LIB_VERSION >= 70
        cinfo->q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #else
        q_scale_factor[tblno] = jpeg_quality_scaling(val);
  #endif
      }
    }
    jpeg_default_qtables(cinfo, force_baseline);
    return TRUE;
  }
  
  
  GLOBAL(boolean)
  set_quant_slots(j_compress_ptr cinfo, char *arg)
  /* Process a quantization-table-selectors parameter string, of the form
   *     N[,N,...]
   * If there are more components than parameters, the last value is replicated.
   */
  {
    int val = 0;                  /* default table # */
    int ci;
    char ch;
  
    for (ci = 0; ci < MAX_COMPONENTS; ci++) {
      if (*arg) {
        ch = ',';                 /* if not set by sscanf, will be ',' */
        if (sscanf(arg, "%d%c", &val, &ch) < 1)
          return FALSE;
        if (ch != ',')            /* syntax check */
          return FALSE;
        if (val < 0 || val >= NUM_QUANT_TBLS) {
          fprintf(stderr, "JPEG quantization tables are numbered 0..%d\n",
                  NUM_QUANT_TBLS - 1);
          return FALSE;
        }
        cinfo->comp_info[ci].quant_tbl_no = val;
        while (*arg && *arg++ != ','); /* advance to next segment of arg
                                          string */
      } else {
        /* reached end of parameter, set remaining components to last table */
        cinfo->comp_info[ci].quant_tbl_no = val;
      }
    }
    return TRUE;
  }
  
  
  GLOBAL(boolean)
  set_sample_factors(j_compress_ptr cinfo, char *arg)
  /* Process a sample-factors parameter string, of the form
   *     HxV[,HxV,...]
   * If there are more components than parameters, "1x1" is assumed for the rest.
   */
  {
    int ci, val1, val2;
    char ch1, ch2;
  
    for (ci = 0; ci < MAX_COMPONENTS; ci++) {
      if (*arg) {
        ch2 = ',';                /* if not set by sscanf, will be ',' */
        if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
          return FALSE;
        if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',') /* syntax check */
          return FALSE;
        if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
          fprintf(stderr, "JPEG sampling factors must be 1..4\n");
          return FALSE;
        }
        cinfo->comp_info[ci].h_samp_factor = val1;
        cinfo->comp_info[ci].v_samp_factor = val2;
        while (*arg && *arg++ != ',');  /* advance to next segment of arg
                                           string */
      } else {
        /* reached end of parameter, set remaining components to 1x1 sampling */
        cinfo->comp_info[ci].h_samp_factor = 1;
        cinfo->comp_info[ci].v_samp_factor = 1;
      }
    }
    return TRUE;
  }
  

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