Batch replace smart objects in mockup file

The script works fine for me but I have one issue here - I need the png placed in the top center of the Smart Object, so if the image is shorter it will be still on top.

// place png files in selected smart object and save jpg;

// 2018, use it at your own risk;

#target photoshop

if (app.documents.length > 0) {

var myDocument = app.activeDocument;

var basename = myDocument.name.match(/(.*)\.[^\.]+$/)[1];

//var thePath = myDocument.path;

var theLayer = myDocument.activeLayer;

// jpg options

var jpgopts = new JPEGSaveOptions();

jpgopts.embedProfile = true;

jpgopts.formatOptions = FormatOptions.STANDARDBASELINE;

jpgopts.matte = MatteType.NONE;

jpgopts.quality = 10;

// check if layer is smart object;

if (theLayer.kind != "LayerKind.SMARTOBJECT") {alert ("selected layer is not a smart object")}

else {

// select files;

var theFolder = Folder.selectDialog ("select folder");

var theFiles = retrievePngFiles (theFolder, []);

if (theFiles) {

// work through the array;

for (var m = 0; m < theFiles.length; m++) {

var thePath = File(theFiles).path;

// open smart object;

var smartObject = openSmartObject (theLayer);

var theLayer2 = smartObject.activeLayer;

// place file and fit to convas;

var theNewOne = placeScaleRotateFile (theFiles, 0, 0, 100, 100, 0);

scaleLayerToFitCanvas ();

hideOthers ();

// close;

smartObject.close(SaveOptions.SAVECHANGES);

//save jpg;

myDocument.saveAs((new File(thePath+"/"+theFiles.name.match(/(.*)\.[^\.]+$/)[1]+"_"+basename+".jpg")),jpgopts,true);

// undo;

myDocument.activeHistoryState = myDocument.historyStates[myDocument.historyStates.length - 1];

}

}

}

};

////// get ong from subfolders //////

function retrievePngFiles (theFolder, theFiles) {

  if (!theFiles) {var theFiles = []};

  var theContent = theFolder.getFiles();

  for (var n = 0; n < theContent.length; n++) {

  var theObject = theContent;

  if (theObject.constructor.name == "Folder") {

  theFiles = retrievePngFiles(theObject, theFiles)

  };

  if (theObject.name.slice(-4).match(/\.(png)$/i) ) {

  theFiles.push(theObject)

  }

  };

  return theFiles

  };

////// place //////

function placeScaleRotateFile (file, xOffset, yOffset, theXScale, theYScale, theAngle) {

// =======================================================

var idPlc = charIDToTypeID( "Plc " );

    var desc5 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

    desc5.putPath( idnull, new File( file ) );

    var idFTcs = charIDToTypeID( "FTcs" );

    var idQCSt = charIDToTypeID( "QCSt" );

    var idQcsa = charIDToTypeID( "Qcsa" );

    desc5.putEnumerated( idFTcs, idQCSt, idQcsa );

    var idOfst = charIDToTypeID( "Ofst" );

        var desc6 = new ActionDescriptor();

        var idHrzn = charIDToTypeID( "Hrzn" );

        var idPxl = charIDToTypeID( "#Pxl" );

        desc6.putUnitDouble( idHrzn, idPxl, xOffset );

        var idVrtc = charIDToTypeID( "Vrtc" );

        var idPxl = charIDToTypeID( "#Pxl" );

        desc6.putUnitDouble( idVrtc, idPxl, yOffset );

    var idOfst = charIDToTypeID( "Ofst" );

    desc5.putObject( idOfst, idOfst, desc6 );

    var idWdth = charIDToTypeID( "Wdth" );

    var idPrc = charIDToTypeID( "#Prc" );

    desc5.putUnitDouble( idWdth, idPrc, theYScale );

    var idHght = charIDToTypeID( "Hght" );

    var idPrc = charIDToTypeID( "#Prc" );

    desc5.putUnitDouble( idHght, idPrc, theXScale );

    var idAngl = charIDToTypeID( "Angl" );

    var idAng = charIDToTypeID( "#Ang" );

    desc5.putUnitDouble( idAngl, idAng,theAngle );

    var idLnkd = charIDToTypeID( "Lnkd" );

    desc5.putBoolean( idLnkd, true );

executeAction( idPlc, desc5, DialogModes.NO );

return app.activeDocument.activeLayer;

};

////// scale layer to fit canvas //////

function scaleLayerToFitCanvas () {

var ref = new ActionReference();

ref.putProperty (stringIDToTypeID ("property"), stringIDToTypeID ("bounds"));

ref.putEnumerated( charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );

var layerDesc = executeActionGet(ref);

var theBounds = layerDesc.getObjectValue(stringIDToTypeID("bounds"));

var layerX = theBounds.getUnitDoubleValue(stringIDToTypeID("left"));

var layerY = theBounds.getUnitDoubleValue(stringIDToTypeID("top"));

var layerWidth = theBounds.getUnitDoubleValue(stringIDToTypeID("right"))-layerX;

var layerHeight = theBounds.getUnitDoubleValue(stringIDToTypeID("bottom"))-layerY;

var ref1 = new ActionReference();

ref1.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );

var docDesc = executeActionGet(ref1);

var docWidth = docDesc.getUnitDoubleValue(stringIDToTypeID("width"));

var docHeight = docDesc.getUnitDoubleValue(stringIDToTypeID("height"));

var docRes = docDesc.getInteger(stringIDToTypeID("resolution"));

var scaleX = docWidth/layerWidth*docRes/72*100;

var scaleY = docHeight/layerHeight*docRes/72*100;

var theScale = Math.min(scaleX, scaleY);

layerX = ((docWidth*docRes/144) - (layerX+layerWidth/2));

layerY = ((docHeight*docRes/144) - (layerY+layerHeight/2));

// =======================================================

var idTrnf = charIDToTypeID( "Trnf" );

    var desc24 = new ActionDescriptor();

//    desc24.putEnumerated( charIDToTypeID( "FTcs" ), charIDToTypeID( "QCSt" ), charIDToTypeID( "Qcs0" ) );

    desc24.putEnumerated( charIDToTypeID( "FTcs" ), charIDToTypeID( "QCSt" ), charIDToTypeID( "Qcsa" ) );

    var idOfst = charIDToTypeID( "Ofst" );

        var desc25 = new ActionDescriptor();

        var idHrzn = charIDToTypeID( "Hrzn" );

        var idPxl = charIDToTypeID( "#Pxl" );

        desc25.putUnitDouble( idHrzn, idPxl, layerX);

        var idVrtc = charIDToTypeID( "Vrtc" );

        desc25.putUnitDouble( idVrtc, idPxl, layerY);

    desc24.putObject( idOfst, idOfst, desc25 );

    var idWdth = charIDToTypeID( "Wdth" );

    var idPrc = charIDToTypeID( "#Prc" );

    desc24.putUnitDouble( idWdth, idPrc, theScale );

    var idHght = charIDToTypeID( "Hght" );

    desc24.putUnitDouble( idHght, idPrc, theScale );

executeAction( idTrnf, desc24, DialogModes.NO );

};

////// open smart object //////

function openSmartObject (theLayer) {

if (theLayer.kind == "LayerKind.SMARTOBJECT") {

// =======================================================

var idplacedLayerEditContents = stringIDToTypeID( "placedLayerEditContents" );

    var desc2 = new ActionDescriptor();

executeAction( idplacedLayerEditContents, desc2, DialogModes.NO );

};

return app.activeDocument

};

////// hide others //////

function hideOthers () {

// hide others;

// =======================================================

var idShw = charIDToTypeID( "Shw " );

    var desc2 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var list1 = new ActionList();

            var ref1 = new ActionReference();

            var idLyr = charIDToTypeID( "Lyr " );

            var idOrdn = charIDToTypeID( "Ordn" );

            var idTrgt = charIDToTypeID( "Trgt" );

            ref1.putEnumerated( idLyr, idOrdn, idTrgt );

        list1.putReference( ref1 );

    desc2.putList( idnull, list1 );

    var idTglO = charIDToTypeID( "TglO" );

    desc2.putBoolean( idTglO, true );

executeAction( idShw, desc2, DialogModes.NO );

};

My script would save Populated template as PSD you can adjust populated images and save out a PNG.  You need to take care when you want to place is png image the transparent borders around an item.   Place and Paste will most likely trim transparent borders to the subject item bounds.  To prevent that when I create the PNG file a put a 1% opaque pixel in the top left and bottom right corners of the documents canvas.  You will never see these pixels amt the will be not transparent borders the Photoshop will trim. If you do not have me scripts search for Photo Collage toolkit https://forums.adobe.com/search.jspa?q=Photo+Collage+toolkit

My scripts will not filter for PNG they will place in any type of image file from a source image folder.  It would be easy to change the extension list to be png only.

To place in images in a particular groups in  order requires you to rename the files with a sort order prefix  which will not be included if you use file nams stamping on placed images.

My Batch Scripts will save PSD files and optionally also save a additional JPG version.  The one image batch script will name save  files with a name that reflects the template and image name.   The Batch multi image script  save files with the a name that reflect the template name a suffix number.  The number is update 1 after a populated template is saved its a count of populated templates.    Many of my scripts do not save a file instead the populated template copy will remain open in Photoshop layered to allow you the tweak the populated template and save out the files you want with the names you want.