#include <iostream>

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/opencv.hpp>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <dmtx.h>

using namespace cv;

int main()
{
   size_t          width, height, bytesPerPixel;
   unsigned char   str[] = "Eu sou o bob, o construtor";
   unsigned char  *pxl;
   DmtxEncode     *enc;
   DmtxImage      *img;
   DmtxDecode     *dec;
   DmtxRegion     *reg;
   DmtxMessage    *msg;

   fprintf(stdout, "input:  \"%s\"\n", str);

   /* 1) ENCODE a new Data Matrix barcode image (in memory only) */

   int size_str = sizeof(str)/sizeof(str[0]);
   
   enc = dmtxEncodeCreate();
   assert(enc != NULL);
   dmtxEncodeDataMatrix(enc, size_str, str);
   

   /* 2) COPY the new image data before releasing encoding memory */

   width = dmtxImageGetProp(enc->image, DmtxPropWidth);
   height = dmtxImageGetProp(enc->image, DmtxPropHeight);
   bytesPerPixel = dmtxImageGetProp(enc->image, DmtxPropBytesPerPixel);
      
   pxl = (unsigned char *)malloc(width * height * bytesPerPixel);
   assert(pxl != NULL);
   memcpy(pxl, enc->image->pxl, width * height * bytesPerPixel);

   dmtxEncodeDestroy(&enc);

   /* 3) DECODE the Data Matrix barcode from the copied image */

   img = dmtxImageCreate(pxl, width, height, DmtxPack24bppRGB);
   assert(img != NULL);

   dec = dmtxDecodeCreate(img, 1);
   assert(dec != NULL);

   reg = dmtxRegionFindNext(dec, NULL);
   if(reg != NULL) {
      msg = dmtxDecodeMatrixRegion(dec, reg, DmtxUndefined);
      if(msg != NULL) {
         fputs("output: \"", stdout);
         fwrite(msg->output, sizeof(unsigned char), msg->outputIdx, stdout);
         fputs("\"\n", stdout);
         dmtxMessageDestroy(&msg);
      }
      dmtxRegionDestroy(&reg);
   }

   dmtxDecodeDestroy(&dec);
   dmtxImageDestroy(&img);
   free(pxl);

   exit(0);
}