Building my own Plug-in Filter

[emilyk3446743]

I am in the process of writing a plug-in filter in Adobe Photoshop and have the following question: Is it possible for a  plug-in filter to determine the pixel position (upper left corner, for example) of the passed in image via FilterRecord relative to the “main” image displayed in photoshop?   

[JJMack]

I do not know actually what you are asking. However I would  think that any image passed is mass as a rectangle canvas where 0,0 will be top left  and width, height the bottom right.  If the image is being pass is a layer in the current document the.  Its relative  document position would also be included it may even be outside the document canvas.

[c.pfaffenbichler]

And Layers’ bounds can be evaluated with JavaScript both via the DOM and AM-code. 

[JJMack]

Here is the script code for the current layer  the script will set guides for the layers bounds and its center and an display the  layer information.

// enable double-clicking from Mac Finder or Windows Explorer
#target photoshop // this command only works in Photoshop CS2 and higher

// bring application forward for double-click events
app.bringToFront();

// Save the current preferences
var startRulerUnits = app.preferences.rulerUnits;
// Set Photoshop to use pixels 
app.preferences.rulerUnits = Units.PIXELS;

try{
	var LB = activeDocument.activeLayer.bounds;
	var LWidth = (LB[2].value) - (LB[0].value);
	var LHeight = (LB[3].value) - (LB[1].value);
	MarkX((LB[0].value + LWidth/2));
	MarkX(LB[0].value);
	MarkX(LB[2].value);
	MarkY((LB[1].value + LHeight/2));
	MarkY(LB[1].value)	
	MarkY(LB[3].value)
	alert("'" + activeDocument.activeLayer.name + "' Layer Bounds\nTop Left " +  LB[0].value + "X," +  LB[1].value + "Y   Bottom Right "  +  LB[2].value + "X," +  LB[3].value
		+ "Y\nWidth " +  LWidth + "px   Height " + LHeight +"px" 
		+ "\nLayer center relative to canvas " + (LB[0].value + LWidth/2) + "X," +  (LB[1].value + LHeight/2) +"Y" 
		, "Layer Bounds Info");
}
catch(e){alert("Requires a layer targered");}

// Return the app preferences
app.preferences.rulerUnits = startRulerUnits;
function MarkX(x) {
// =======================================================
var idMk = charIDToTypeID( "Mk  " );
    var desc61 = new ActionDescriptor();
    var idNw = charIDToTypeID( "Nw  " );
        var desc62 = new ActionDescriptor();
        var idPstn = charIDToTypeID( "Pstn" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc62.putUnitDouble( idPstn, idPxl, x);
        var idOrnt = charIDToTypeID( "Ornt" );
        var idOrnt = charIDToTypeID( "Ornt" );
        var idVrtc = charIDToTypeID( "Vrtc" );
        desc62.putEnumerated( idOrnt, idOrnt, idVrtc );
    var idGd = charIDToTypeID( "Gd  " );
    desc61.putObject( idNw, idGd, desc62 );
executeAction( idMk, desc61, DialogModes.NO );
}
function MarkY(y) {
// =======================================================
var idMk = charIDToTypeID( "Mk  " );
    var desc63 = new ActionDescriptor();
    var idNw = charIDToTypeID( "Nw  " );
        var desc64 = new ActionDescriptor();
        var idPstn = charIDToTypeID( "Pstn" );
        var idPxl = charIDToTypeID( "#Pxl" );
        desc64.putUnitDouble( idPstn, idPxl, y );
        var idOrnt = charIDToTypeID( "Ornt" );
        var idOrnt = charIDToTypeID( "Ornt" );
        var idHrzn = charIDToTypeID( "Hrzn" );
        desc64.putEnumerated( idOrnt, idOrnt, idHrzn );
    var idGd = charIDToTypeID( "Gd  " );
    desc63.putObject( idNw, idGd, desc64 );
executeAction( idMk, desc63, DialogModes.NO );
}