twlbg.c

signed int __fastcall sub_300B78(_BYTE *a1, _BYTE *a2, int a3, int screen_mode)
{
  signed int result; // r0@8
  signed int v5; // r3@9
  signed int v6; // r1@10
  u16 *v7; // r7@11
  signed int v8; // r1@15
  signed int v9; // r3@16
  u16 v10; // r5@17
  u16 *v11; // r6@17
  signed int v12; // r1@7
  signed int v13; // r3@21
  u16 v14; // r5@22
  u16 *v15; // r6@22

  if ( a1 && a2 && a3 )
  {
    if ( screen_mode )                          // interpolation needed? 0 = 256x200
    {
      if ( screen_mode == 1 )                   // 3DS bottom screen size
      {
        *a1 = 5;
        *a2 = 15;
        v8 = 0;
        do
        {
          v9 = 0;
          while ( *a1 > v9 )
          {
            // symmetrical matrix if the 1st column is removed
            v10 = *(&word_34A7F4[5 * v8 + 6] + v9);// text0:0034A800                 DCW      0,  0x4E, 0x11D, 0x1E3, 0x1C1; 0
                                                // text0:0034A800                 DCW      0,0xFCA5,0xF8D0,0xF69D,0xF873; 5
                                                // text0:0034A800                 DCW      0, 0xD47,0x1E35,0x2F08,0x3B6F; 10
                                                // text0:0034A800                 DCW 0x4000,0x3B6F,0x2F08,0x1E35, 0xD47; 15
                                                // text0:0034A800                 DCW      0,0xF873,0xF69D,0xF8D0,0xFCA5; 20
                                                // text0:0034A800                 DCW      0, 0x1C1, 0x1E3, 0x11D,  0x4E; 25
            v11 = (u16 *)(12 * v9++ + a3);
            v11[v8] = v10;
          }
          ++v8;
        }
        while ( v8 < 6 );
      }
      else if ( screen_mode == 2 )              // part of 3DS top screen size
      {
        *a1 = 6;
        *a2 = 27;
        v12 = 0;
        do
        {
          v13 = 0;
          while ( *a1 > v13 )
          {
            v14 = *(&word_34A7F4[6 * v12 + 36] + v13);
                                                // text0:0034A83C                 DCW      0,     0,     0,     0,     0,     0; 0
                                                // text0:0034A83C                 DCW      0,     0,     0,     0,     0,     0; 6
                                                // text0:0034A83C                 DCW      0,0x2000,0x4000,     0,0x2000,0x4000; 12
                                                // text0:0034A83C                 DCW 0x4000,0x2000,     0,0x4000,0x2000,     0; 18
                                                // text0:0034A83C                 DCW      0,     0,     0,     0,     0,     0; 24
                                                // text0:0034A83C                 DCW      0,     0,     0,     0,     0,     0; 30
            v15 = (u16 *)(12 * v13++ + a3);
            v15[v12] = v14;
          }
          ++v12;
        }
        while ( v12 < 6 );
      }
    }
    else
    {
      *a1 = 4;
      v5 = 0;
      *a2 = 15;
      do
      {
        v6 = 0;
        while ( *a1 > v6 )
        {
          v7 = (u16 *)(12 * v6++ + a3);
          v7[v5] = word_34A7F4[v5];             // 0,     0,     0,0x4000,     0,     0
        }
        ++v5;
      }
      while ( v5 < 6 );
    }
    result = 1;
  }
  else
  {
    result = 0;
  }
  return result;
}