code: function isType0(celName, frameNum) {
      // These special frames are type 1.
      switch (celName) {
      case 'l1':
          switch (frameNum) {
          case 148: case 159: case 181: case 186: case 188:
              return false;
          }
          break;
      case 'l2':
          switch (frameNum) {
          case 47: case 1397: case 1399: case 1411:
              return false;
          }
          break;
      case 'l4':
          switch (frameNum) {
          case 336: case 639:
              return false;
          }
          break;
      case 'town':
          switch (frameNum) {
          case 2328: case 2367: case 2593:
              return false;
          }
      }
  
      return true;
  }
docs: Returns true if the image is a plain 32x32.