text: /* -*- C++ -*-
   * File: 4channels.cpp
   * Copyright 2008-2021 LibRaw LLC (info@libraw.org)
   * Created: Mon Feb 09, 2009
   *
   * LibRaw sample
   * Generates 4 TIFF file from RAW data, one file per channel
   *
  
  LibRaw is free software; you can redistribute it and/or modify
  it under the terms of the one of two licenses as you choose:
  
  1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
     (See file LICENSE.LGPL provided in LibRaw distribution archive for details).
  
  2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
     (See file LICENSE.CDDL provided in LibRaw distribution archive for details).
  
  
   */
  #include <stdio.h>
  #include <string.h>
  #include <math.h>
  #include "libraw/libraw.h"
  
  #ifndef LIBRAW_WIN32_CALLS
  #include <netinet/in.h>
  #else
  #include <winsock2.h>
  #endif
  
  #ifdef LIBRAW_WIN32_CALLS
  #define snprintf _snprintf
  #endif
  
  int main(int ac, char *av[])
  {
    int i, ret;
    int autoscale = 0, black_subtraction = 1, use_gamma = 0;
    char outfn[1024];
  
    LibRaw RawProcessor;
    if (ac < 2)
    {
    usage:
      printf("4channels - LibRaw %s sample. %d cameras supported\n"
             "Usage: %s [-s N] [-g] [-A] [-B] [-N] raw-files....\n"
             "\t-s N - select Nth image in file (default=0)\n"
             "\t-g - use gamma correction with gamma 2.2 (not precise,use for "
             "visual inspection only)\n"
             "\t-A - autoscaling (by integer factor)\n"
             "\t-B - no black subtraction\n",
             LibRaw::version(), LibRaw::cameraCount(), av[0]);
      return 0;
    }
  
  #define P1 RawProcessor.imgdata.idata
  #define S RawProcessor.imgdata.sizes
  #define C RawProcessor.imgdata.color
  #define T RawProcessor.imgdata.thumbnail
  #define P2 RawProcessor.imgdata.other
  #define OUT RawProcessor.imgdata.params
  #define OUTR RawProcessor.imgdata.rawparams
  
    OUT.output_bps = 16;
    OUT.output_tiff = 1;
    OUT.user_flip = 0;
    OUT.no_auto_bright = 1;
    OUT.half_size = 1;
  
    for (i = 1; i < ac; i++)
    {
      if (av[i][0] == '-')
      {
        if (av[i][1] == 's' && av[i][2] == 0)
        {
          i++;
          OUTR.shot_select = av[i] ? atoi(av[i]) : 0;
        }
        else if (av[i][1] == 'g' && av[i][2] == 0)
          use_gamma = 1;
        else if (av[i][1] == 'A' && av[i][2] == 0)
          autoscale = 1;
        else if (av[i][1] == 'B' && av[i][2] == 0)
        {
          black_subtraction = 0;
        }
        else
          goto usage;
        continue;
      }
      if (!use_gamma)
        OUT.gamm[0] = OUT.gamm[1] = 1;
  
      int c;
      printf("Processing file %s\n", av[i]);
      if ((ret = RawProcessor.open_file(av[i])) != LIBRAW_SUCCESS)
      {
        fprintf(stderr, "Cannot open %s: %s\n", av[i], libraw_strerror(ret));
        continue; // no recycle b/c open file will recycle itself
      }
      if (P1.is_foveon)
      {
        printf("Cannot process Foveon image %s\n", av[i]);
        continue;
      }
      if ((ret = RawProcessor.unpack()) != LIBRAW_SUCCESS)
      {
        fprintf(stderr, "Cannot unpack %s: %s\n", av[i], libraw_strerror(ret));
        continue;
      }
      RawProcessor.raw2image();
      if (black_subtraction)
      {
        RawProcessor.subtract_black();
      }
  
      if (autoscale)
      {
        unsigned max = 0, scale = 1;
        for (int j = 0; j < S.iheight * S.iwidth; j++)
          for (int c = 0; c < 4; c++)
            if (max < RawProcessor.imgdata.image[j][c])
              max = RawProcessor.imgdata.image[j][c];
        if (max > 0 && max < 1 << 15)
        {
          scale = (1 << 16) / max;
          printf("Scaling with multiplier=%d (max=%d)\n", scale, max);
          for (int j = 0; j < S.iheight * S.iwidth; j++)
            for (c = 0; c < 4; c++)
              RawProcessor.imgdata.image[j][c] *= scale;
        }
        printf("Black level (scaled)=%d\n", C.black * scale);
      }
      else
        printf("Black level (unscaled)=%d\n", C.black);
  
      // hack to make dcraw tiff writer happy
      int isrgb = (P1.colors == 4 ? 0 : 1);
      P1.colors = 1;
      S.width = S.iwidth;
      S.height = S.iheight;
  
      for (int layer = 0; layer < 4; layer++)
      {
        if (layer > 0)
        {
          for (int rc = 0; rc < S.iheight * S.iwidth; rc++)
            RawProcessor.imgdata.image[rc][0] =
                RawProcessor.imgdata.image[rc][layer];
        }
        char lname[8];
        if (isrgb)
        {
          snprintf(lname, 7, "%c", ((char *)("RGBG"))[layer]);
          if (layer == 3)
            strcat(lname, "2");
        }
        else
          snprintf(lname, 7, "%c", ((char *)("GCMY"))[layer]);
  
        if (OUTR.shot_select)
          snprintf(outfn, sizeof(outfn), "%s-%d.%s.tiff", av[i], OUTR.shot_select,
                   lname);
        else
          snprintf(outfn, sizeof(outfn), "%s.%s.tiff", av[i], lname);
  
        printf("Writing file %s\n", outfn);
        if (LIBRAW_SUCCESS != (ret = RawProcessor.dcraw_ppm_tiff_writer(outfn)))
          fprintf(stderr, "Cannot write %s: %s\n", outfn, libraw_strerror(ret));
      }
    }
    return 0;
  }
  