lbio.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

              {
//printf("spy_bmp() -- Turning periodic_y off at ( %d, %d).\n",
//    (int)floor((double)i/3.), j);
                lattice->periodic_y = 0;
              }
            }
          }

          if( ( (b&0xff) == 0) &&( (g&0xff) == 255) &&( (r&0xff) == 0) )
          {
            // Green ==> Outflow, Pressure boundaries.
            //bcs[j][(int)floor((double)i/3.)] = 12;
//printf("spy_bmp() -- Outflow at ( %d, %d).\n",
//    (int)floor((double)i/3.), j);

            if(    (int)floor((double)i/3.) == 0 
                || (int)floor((double)i/3.) == lattice->param.LX-1 )
            {
              if( !( j==0 || j == lattice->param.LY-1))
              {
//printf("spy_bmp() -- Turning periodic_x off at ( %d, %d).\n",
//    (int)floor((double)i/3.), j);
                lattice->periodic_x = 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))
              {
//printf("spy_bmp() -- Turning periodic_y off at ( %d, %d).\n",
//    (int)floor((double)i/3.), j);
                lattice->periodic_y = 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( char *filename, lattice_ptr lattice, int **bcs)
{
  FILE *in;
  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;

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

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

  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 = (double)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 ));

//printf( "read_bcs() -- ( %d, %d), (r,g,b) = ( %d, %d, %d)\n",
//  (int)floor((double)i/3.), j, r&0xff, g&0xff, b&0xff);

          if( ( (b&0xff) == 0) &&( (g&0xff) == 0) &&( (r&0xff) == 255) )
          {
            // Red ==> Inflow, Pressure boundaries.
            bcs[j][(int)floor((double)i/3.)] = 1;
//printf( "read_bcs() -- Red at ( %d, %d).\n", (int)floor((double)i/3.), j);
          }

          if( ( (b&0xff) == 0) &&( (g&0xff) == 255) &&( (r&0xff) == 0) )
          {
            // Green ==> Outflow, Pressure boundaries.
            bcs[j][(int)floor((double)i/3.)] = 2;
//printf( "read_bcs() -- Green at ( %d, %d).\n", (int)floor((double)i/3.), j);
          }

        }
        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);

  ei = lattice->param.LX-1;
  ej = lattice->param.LY-1;

  for( n=0; n<lattice->NumNodes; n++)
  {
    i = lattice->node[n].i;
    j = lattice->node[n].j;

    if( bcs[ j][ i] != 0)
    {
//printf("read_bcs() -- n = %d, ( %d, %d) of ( %d, %d).\n", n, i, j, ei, ej);
#if 0
      if(    ( i==0  && j==0 )
          || ( i==ei && j==0 )
          || ( i==ei && j==ej)
          || ( i==0  && j==ej)  )
      {
        // Skip corners for now.
        printf("read_bcs() -- WARNING: Skipping corner ( %d, %d).", i, j);
      }
      else
      {
#endif
#if 0
        if( i==0)
        {
          // West
          if( bcs[ j][ i] == 1)
          {
            // Inflow
            lattice->bc[n].bc_type |= BC_PRESSURE_W_IN;
            //lattice->periodic_x = 0;
          }
          else if( bcs[ j][ i] == 2)
          {
            // Outflow
            lattice->bc[n].bc_type |= BC_PRESSURE_W_OUT;
            //lattice->periodic_x = 0;
          }
          else
          {
            // Unhandled case.
            printf("read_bcs() -- Unhandled case: "
                "bcs[ %d][ %d] = %d .  Exiting!\n", 
                i, j, bcs[j][i]);
            exit(1);
          }

        }
        else if( i==ei)
        {
          // East
          if( bcs[ j][ i] == 1)
          {
            // Inflow
            lattice->bc[n].bc_type |= BC_PRESSURE_E_IN;
            //lattice->periodic_x = 0;
          }
          else if( bcs[ j][ i] == 2)
          {
            // Outflow
            lattice->bc[n].bc_type |= BC_PRESSURE_E_OUT;
            //lattice->periodic_x = 0;
          }
          else
          {
            // Unhandled case.
            printf("read_bcs() -- Unhandled case: "
                "bcs[ %d][ %d] = %d .  Exiting!\n", 
                i, j, bcs[j][i]);
            exit(1);
          }

        }
        else 
#endif
        if( j==0)
        {
//printf("read_bcs() -- South at i=%d\n", i);
          // South
          if( bcs[ j][ i] == 1)
          {
            // Inflow
            lattice->bc[n].bc_type |= BC_PRESSURE_S_IN;
            //lattice->periodic_y = 0;
          }
          else if( bcs[ j][ i] == 2)
          {
            // Outflow
            lattice->bc[n].bc_type |= BC_PRESSURE_S_OUT;
            //lattice->periodic_y = 0;
          }
          else
          {
            // Unhandled case.
            printf("read_bcs() -- Unhandled case: "
                "bcs[ %d][ %d] = %d .  Exiting!\n", 
                i, j, bcs[j][i]);
            exit(1);
          }

        }
        else if( j==ej)
        {
//printf("read_bcs() -- North at i=%d\n", i);
          // North
          if( bcs[ j][ i] == 1)
          {
            // Inflow
            lattice->bc[n].bc_type |= BC_PRESSURE_N_IN;
            //lattice->periodic_y = 0;
          }
          else if( bcs[ j][ i] == 2)
          {
            // Outflow
            lattice->bc[n].bc_type |= BC_PRESSURE_N_OUT;
            //lattice->periodic_y = 0;
          }
          else
          {
            // Unhandled case.
            printf("read_bcs() -- Unhandled case: "
                "bcs[ %d][ %d] = %d .  Exiting!\n", 
                i, j, bcs[j][i]);
            exit(1);
          }

        }
        else
        {
          // Unhandled case.
          printf("read_bcs() -- WARNING: "
              "Support for interior flow bcs is pending! "
              "Skipping ( i, j) = ( %d, %d).\n", i, j);
        }
#if 0
      }
#endif

    }

  }

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

} /* read_bcs( char *filename, int ***bcs, int *height, int *width) */

// void rho2bmp( char *filename, int time)
//##############################################################################
//
// R H O 2 B M P 
//
void rho2bmp( lattice_ptr lattice, int time)
{
  FILE   *in, 
         *o;
  int    i, j, 
         n, m;
  int    pad, 
         bytes_per_row;
  int    frame;
  char   k;
  char   b;
  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;
  char   filename[1024];