code: function decode (imageDataView, width, height, format) {
      var result;
  
      format = format ? format.toLowerCase() : 'dxt1';
  
      if (format === decode.dxt1) {
          result = decodeBC1(imageDataView, width, height);
      } else if(format === decode.dxt2) {
          result = decodeBC2(imageDataView, width, height, true);
      } else if(format === decode.dxt3) {
          result = decodeBC2(imageDataView, width, height, false);
      } else if(format === decode.dxt4) {
          result = decodeBC3(imageDataView, width, height, true);
      } else if(format === decode.dxt5) {
          result = decodeBC3(imageDataView, width, height, false);
      } else {
          throw new Error('Unknown DXT format : \'' + format + '\'');
      }
  
      return result;
  }
docs: Decode a DXT image to RGBA data.
  @param {DataView} imageDataView A DataView pointing directly to the data of the DXT image
  @param {int} width Width of the image
  @param {int} height Height of the image
  @param {string} [format='dxt1'] Format of the image (dxt1, dxt2, dxt3, dxt4 or dxt5)
  @returns {Uint8Array} Decoded RGBA data
  @throws Will throw if the format is not recognized