bitmapIte4.md

bitmapItem.hasValidAlphaLayer

Availability

Flash CS6 Professional.

Usage

bitmapItem.hasValidAlphaLayer

Description

Read-only property; a boolean indicating if a bitmap in the library has a valid/useful alpha channel. This flag will help you decide if you should export the bitmap item as a PNG instead of a JPEG using the bitmapItem.exportToFile() function.

Example

The following code exports a library item with the proper file name extension depending on whether it has a valid alpha layer.

var bitmapItem = fl.getDocumentDOM().library.items[0]; 
var uri = fl.browseForFileURI("open");
if (bitmapItem.hasValidAlphaLayer) uri += ".png"; 
    else uri += ".jpg";
bitmapItem.exportToFile(uri);

See also

bitmapItem.sourceFileExists, bitmapItem.sourceFileIsCurrent, bitmapItem.sourceFilePath, FLfile.getModificationDate()