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// 9-patch export
//
// This plugin crops upscaled 9-patch PNG assets when exported from Sketch,
// to ensure that 9-patch borders remain 1px wide when upscaled.
//
function onExportSlices(context) {
var exports = context.actionContext.exports;
for (var i = 0; i < exports.count(); ++i) {
var name = exports[i].request.name();
var scale = exports[i].request.scale();
if (scale > 1 && name.endsWith(".9"))
cropAsset(exports[i].path, scale - 1);
}
}
function cropAsset(path, inset) {
var url = NSURL.fileURLWithPath(path);
var img = CIImage.imageWithContentsOfURL(url);
var rect = NSInsetRect(img.extent(), inset, inset);
var cropped = img.imageByCroppingToRect(rect);
var rep = NSBitmapImageRep.alloc().initWithCIImage(cropped);
var data = rep.PNGRepresentationWithInterlaced(false);
data.writeToFile(path);
}
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