How to ignore Text Layer & PNG Layer in PS Scripts

In this script working Only Background Layer Ignore. I wish How to Ignore Text Layer & PNG Layers.

Thanks in Advance Sir

// Switch off any dialog boxes
displayDialogs = DialogModes.NO; // OFF

// call the source document
var srcDoc = app.activeDocument;
var numOfLayers = srcDoc.layers.length;
var vCount = 0;
var hCount = 0;

// main loop
for (var i = numOfLayers -1; i >= 0 ; i--)
{
// get a referenec to each layer as we loop over them
var thisLayer = srcDoc.layers[i];
var artLayer= srcDoc.artLayers[i].visible=false;
// get the layer bounds of each layer as you go
srcDoc.activeLayer = thisLayer;
var lb = get_layer_bounds();

// set a variable to for portrait or landscape
var portrait = true;

// if layer is wider than it is long,
// it's landscape
if (lb[0] > lb[1]) portrait = false;
//alert(lb[0] + "," + lb[1] + "\n" + portrait + "\n" +thisLayer.name);

// ignore the background layer
// if there is one
var art=app.activeDocument.artLayer;
if (thisLayer.isBackgroundLayer==false)
{
if (portrait)
{
srcDoc.artLayers[i].name = "VFrame";
// add one to the horizontal count
hCount +=1
}
else
{
srcDoc.artLayers[i].name = "HFrame";
// add one to the vertical count
vCount+=1
}
}
}
//var docName = srcDoc.name.substring(0, srcDoc.name.length -4);
//var imgName = vCount + "v" + hCount + "h_" + docName + "_0001.psd";
//duplicateIt(imgName);

// Set Display Dialogs back to normal
displayDialogs = DialogModes.ALL; // NORMAL

// function GET LAYER BOUNDS ()
// ----------------------------------------------------------------
function get_layer_bounds()
{
var x = parseFloat(app.activeDocument.activeLayer.bounds[0]);
var y = parseFloat(app.activeDocument.activeLayer.bounds[1]);
var x1 = parseFloat(app.activeDocument.activeLayer.bounds[2]);
var y1 = parseFloat(app.activeDocument.activeLayer.bounds[3]);

var selW = parseFloat(x1-x);
var selH = parseFloat(y1-y);

// return the results as an array
return [selW, selH];
}

function duplicateIt(str)
{
// duplicate image into new document
if (arguments.length == 0) str = "temp";

var id428 = charIDToTypeID( "Dplc" );
var desc92 = new ActionDescriptor();
var id429 = charIDToTypeID( "null" );
var ref27 = new ActionReference();
var id430 = charIDToTypeID( "Dcmn" );
var id431 = charIDToTypeID( "Ordn" );
var id432 = charIDToTypeID( "Frst" );
ref27.putEnumerated( id430, id431, id432 );
desc92.putReference( id429, ref27 );
var id433 = charIDToTypeID( "Nm " );
desc92.putString( id433, str ); // name
executeAction( id428, desc92, DialogModes.NO );
}