lbio_03082005.c

基于格子Boltzmann方法开源可视化软件的源代码 具有很高的实用价值。对学习LBM方法及其软件开发非常游泳

//
// S P Y   B M P 
//
//  - Returns matrix 'spy' of ones and zeros.
//
//  - Zeros for white pixels.
//
//  - Ones for non-white pixels.
//
void spy_bmp( char *filename, lattice_ptr lattice, int **spy)
{
  FILE *in, *o;
  int i, j, n, m;
  int pad, bytes_per_row;
  char k;
  char b, g, r;
  struct bitmap_file_header bmfh;
  struct bitmap_info_header bmih;
  struct rgb_quad rgb;
  int *int_ptr;
  short int *short_int_ptr;
  int *width_ptr;
  int *height_ptr;
  short int *bitcount_ptr;

  printf("spy_bmp() -- Hi!\n");

  // Clear the spy array.
  for( j=0; j<lattice->param.LY; j++)
  {
    for( i=0; i<lattice->param.LX; i++)
    {
      spy[j][i] = 0;
    }
  }

  if( !( in = fopen( filename, "r")))
  {
#if 1
    printf("spy_bmp() -- Error opening file \"%s\".\n", filename);
    exit(1);
#else
    printf(" %s::spy_bmp() %d >> File \"%s\" cannot be opened for reading.\n",
        __FILE__, __LINE__, filename);
    if( !( o = fopen( filename, "w+")))
    {
      // TODO: Write blank bmp file.
    }
    printf(" %s::spy_bmp() %d >> Wrote a blank \"%s\" file.\n", 
        __FILE__, __LINE__, filename);
    printf(" %s::spy_bmp() %d >> Returning all zeros!\n", __FILE__, __LINE__);
    fclose( o);
    return;
#endif
  }

  // n = fread( void *BUF, size_t SIZE, size_t COUNT, FILE *FP);

  n = fread( &bmfh, sizeof(struct bitmap_file_header), 1, in );
  if( strncmp(bmfh.bfType,"BM",2))
  {
    printf("ERROR: Can't process this file type.  Exiting!\n");
    printf("\n");
    exit(1);
  }
  n = fread( &bmih, sizeof(struct bitmap_info_header), 1, in );
  int_ptr = (int*)bmih.biCompression;
  if( *int_ptr != 0)
  {
    printf("ERROR: Can't handle compression.  Exiting!\n");
    printf("\n");
    exit(1);
  }

  width_ptr = (int*)bmih.biWidth;
  height_ptr = (int*)bmih.biHeight;
  bitcount_ptr = (short int*)bmih.biBitCount;

  if( *width_ptr != lattice->param.LX)
  {
    printf("%s %d >> ERROR: LX %d does not match the "
        "width %d of the BMP file. Exiting!\n", 
        __FILE__, __LINE__, lattice->param.LX, *width_ptr);
    exit(1);
  }

  if( *height_ptr != lattice->param.LY)
  {
    printf("%s %d >> ERROR: LY %d does not match the "
        "height %d of the BMP file. Exiting!\n", 
        __FILE__, __LINE__, lattice->param.LY, *height_ptr);
    exit(1);
  }

  if( *bitcount_ptr < 24)
  {
    n = (int)pow(2.,(double)*bitcount_ptr); // Num palette entries.
    for( i=0; i<n; i++)
    {
      k = fread( &rgb, sizeof(struct rgb_quad), 1, in );
      if( k!=1)
      {
        printf("Error reading palette entry %d.  Exiting!\n", i);
        exit(1);
      }
    }
  }

  // Bytes per row of the bitmap.
  bytes_per_row = 
    ((int)ceil(( (((double)(*width_ptr))*((double)(*bitcount_ptr)))/8.)));

  // Bitmaps pad rows to preserve 4-byte boundaries.
  // The length of a row in the file will be bytes_per_row + pad .
  pad = ((4) - bytes_per_row%4)%4;

  n = 0;
  m = 0;
  n+=( k = fread( &b, 1, 1, in ));
  i = 0;
  j = 0;
  while( !feof(in))
  {
    switch(*bitcount_ptr)
    {
      case 1: // Monochrome.
        printf("spy_bmp() -- "
            "Support for Monochrome BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x80) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x40) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x20) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x10) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x08) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x04) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x02) == 0); }
        i++;     
        if( i < *width_ptr) { (spy)[j][i] = ( (b & 0x01) == 0); }
        i++;
        break;

      case 4: // 16 colors.
        printf("spy_bmp() -- "
            "Support for 16 color BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (spy)[j][i] = ( (b&0xf0)>>4 != 15); }
        i++;
        if( i < *width_ptr) { (spy)[j][i] = ( (b&0x0f) != 15); }
        i++;
        break;

      case 8: // 256 colors.
        printf("spy_bmp() -- "
            "Support for 256 color BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (spy)[j][i] = ( (b&0xff) != 255); }
        i++;
        break;

      case 24: // 24-bit colors.
        if( i < 3*(*width_ptr)) 
        { 
          i++; n+=( k = fread( &g, 1, 1, in ));
          i++; n+=( k = fread( &r, 1, 1, in ));

          if( ( (b&0xff) == 0) &&( (g&0xff) == 0) &&( (r&0xff) == 0) )
          {
            (spy)[j][(int)floor((double)i/3.)] = 1;
          }

#if 0
          if( ( (b&0xff) == 0) &&( (g&0xff) == 0) &&( (r&0xff) == 255) )
          {
            // Red ==> Inflow, Pressure boundaries.
            if(    (int)floor((double)i/3.) == 0 
                || (int)floor((double)i/3.) == lattice->param.LX-1 )
            {
              if( !( j==0 || j == lattice->param.LY-1))
              {
                lattice->periodic_x[subs] = 0;
              }
            }
            if(    j == 0 
                || j == lattice->param.LY-1 )
            {
              if( !(   (int)floor((double)i/3.) == 0 
                    || (int)floor((double)i/3.) == lattice->param.LX-1))
              {
                lattice->periodic_y[subs] = 0;
              }
            }
          }

          if( ( (b&0xff) == 0) &&( (g&0xff) == 255) &&( (r&0xff) == 0) )
          {
            // Green ==> Outflow, Pressure boundaries.
            if(    (int)floor((double)i/3.) == 0 
                || (int)floor((double)i/3.) == lattice->param.LX-1 )
            {
              if( !( j==0 || j == lattice->param.LY-1))
              {
                lattice->periodic_x[subs] = 0;
              }
            }
            if(    j == 0 
                || j == lattice->param.LY-1 )
            {
              if( !(   (int)floor((double)i/3.) == 0 
                    || (int)floor((double)i/3.) == lattice->param.LX-1))
              {
                lattice->periodic_y[subs] = 0;
              }
            }
          }
#endif
        }
        i++;
        break;

      default: // 32-bit colors?
        printf("ERROR: Unhandled color depth, "
            "BitCount = %d. Exiting!\n", *bitcount_ptr);
        exit(1);
        break;

    } /* switch(*(bmih.biBitCount)) */

    if( !(n%(bytes_per_row+pad))) { m++; i=0; j++;}
    n+=( k = fread( &b, 1, 1, in ));

  } /* while( !feof(in)) */

  if( (bytes_per_row+pad)*m!=n)
  {
    printf("WARNING: Num bytes read = %d versus num bytes predicted = %d .\n",
        n, (bytes_per_row+pad)*m);
  }

  if( m != *height_ptr)
  {
    printf("WARNING: m (%d) != bmih.biHeight (%d).\n", m, *height_ptr);
  }

  fclose(in);

  printf("spy_bmp() -- Bye!\n");
  printf("\n");

} /* spy_bmp( char *filename, int **spy) */

// void read_bcs( char *filename, int **bcs)
//##############################################################################
//
// R E A D   B C S
//
//  - Read boundary condition information from file.
//
void read_bcs( lattice_ptr lattice, int **bcs)
{
  FILE   *in;
  char   filename[1024];
  int    i, j, n, m;
  int    ei, ej;
  int    pad, bytes_per_row;
  char   k;
  char   b, g, r;
  struct bitmap_file_header bmfh;
  struct bitmap_info_header bmih;
  struct rgb_quad rgb;
  int    *int_ptr;
  short  int *short_int_ptr;
  int    *width_ptr;
  int    *height_ptr;
  short  int *bitcount_ptr;
  int    subs;

  printf("read_bcs() -- Hi!\n");

 for( subs=0; subs<NUM_FLUID_COMPONENTS; subs++)
 {

  // Clear the bcs array.
  for( j=0; j<lattice->param.LY; j++)
  {
    for( i=0; i<lattice->param.LX; i++)
    {
      bcs[j][i] = 0;
    }
  }


  sprintf( filename, "./in/%dx%dbc_subs%02d.bmp", 
           lattice->param.LX, 
           lattice->param.LY, subs);
  if( !( in = fopen( filename, "r")))
  {
    printf("read_bcs() -- Error opening file \"%s\".\n", filename);
    exit(1);
  }

  // Read the headers.
  n = fread( &bmfh, sizeof(struct bitmap_file_header), 1, in );
  if( strncmp(bmfh.bfType,"BM",2))
  {
    printf("ERROR: Can't process this file type.  Exiting!\n");
    printf("\n");
    exit(1);
  }
  n = fread( &bmih, sizeof(struct bitmap_info_header), 1, in );
  int_ptr = (int*)bmih.biCompression;
  if( *int_ptr != 0)
  {
    printf("ERROR: Can't handle compression.  Exiting!\n");
    printf("\n");
    exit(1);
  }

  width_ptr = (int*)bmih.biWidth;
  height_ptr = (int*)bmih.biHeight;
  bitcount_ptr = (short int*)bmih.biBitCount;

  if( *height_ptr != lattice->param.LY)
  {
    printf("ERROR: Lattice height does not match "
        "soil matrix data \"%s\".  (%d!=%d)  Exiting!\n",
        filename,
        lattice->param.LY, *height_ptr );
    printf("\n");
    exit(1);
  }

  if( *width_ptr != lattice->param.LX)
  {
    printf("ERROR: Lattice width does not match "
        "soil matrix data \"%s\".  (%d!=%d)  Exiting!\n", 
        filename,
        lattice->param.LX, *width_ptr );
    printf("\n");
    exit(1);
  }

  // Read the palette, if necessary.
  if( *bitcount_ptr < 24)
  {
    n = (int)pow(2.,(double)*bitcount_ptr); // Num palette entries.
    for( i=0; i<n; i++)
    {
      k = fread( &rgb, sizeof(struct rgb_quad), 1, in );
      if( k!=1)
      {
        printf("Error reading palette entry %d.  Exiting!\n", i);
        exit(1);
      }
    }
  }

  // Bytes per row of the bitmap.
  bytes_per_row = 
    ((int)ceil(( (((double)(*width_ptr))*((double)(*bitcount_ptr)))/8.)));

  // Bitmaps pad rows to preserve 4-byte boundaries.
  // The length of a row in the file will be bytes_per_row + pad .
  pad = ((4) - bytes_per_row%4)%4;

  n = 0;
  m = 0;
  n+=( k = fread( &b, 1, 1, in ));
  i = 0;
  //j = *height_ptr-1;
  j = 0;//*height_ptr-1;
  while( !feof(in))
  {
    switch(*bitcount_ptr)
    {
      case 1: // Monochrome.
        printf("read_bcs() -- "
            "Support for Monochrome BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x80) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x40) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x20) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x10) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x08) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x04) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x02) == 0); }
        i++;     
        if( i < *width_ptr) { (bcs)[j][i] = ( (b & 0x01) == 0); }
        i++;
        break;

      case 4: // 16 colors.
        printf("read_bcs() -- "
            "Support for 16 color BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (bcs)[j][i] = ( (b&0xf0)>>4 != 15); }
        i++;
        if( i < *width_ptr) { (bcs)[j][i] = ( (b&0x0f) != 15); }
        i++;
        break;

      case 8: // 256 colors.
        printf("read_bcs() -- "
            "Support for 256 color BMPs is pending.  "
            "Exiting!\n");
        exit(1);

        if( i < *width_ptr) { (bcs)[j][i] = ( (b&0xff) != 255); }
        i++;
        break;

      case 24: // 24-bit colors.
        if( i < 3*(*width_ptr)) 
        { 
          i++; n+=( k = fread( &g, 1, 1, in ));
          i++; n+=( k = fread( &r, 1, 1, in ));
          if( ( (b&0xff) == 0) &&( (g&0xff) == 0) &&( (r&0xff) == 255) )
          { // R E D ==> Inflow, Pressure boundaries.
            bcs[j][(int)floor((double)i/3.)] = 1;
          }
          if( ( (b&0xff) == 0) &&( (g&0xff) == 255) &&( (r&0xff) == 0) )
          { // G R E E N ==> Outflow, Pressure boundaries.
            bcs[j][(int)floor((double)i/3.)] = 2;
          }

        }
        i++;
        break;

      default: // 32-bit colors?
        printf("ERROR: Unhandled color depth, "
            "BitCount = %d. Exiting!\n", *bitcount_ptr);
        exit(1);