/* -*- C++ -*-
 * File: 4channels.cpp
 * Copyright 2008-2015 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 three 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).

3. LibRaw Software License 27032010
   (See file LICENSE.LibRaw.pdf provided in LibRaw distribution archive for details).



 */
#include <stdio.h>
#include <string.h>
#include <math.h>
#ifndef WIN32
#include <netinet/in.h>
#else
#include <winsock2.h>
#endif

#include "libraw/libraw.h"

#ifdef WIN32
#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

    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++;
                            OUT.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(OUT.shot_select)
                        snprintf(outfn,sizeof(outfn),"%s-%d.%s.tiff",av[i],OUT.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;
}
