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Bilinear Bitmap scaling

/ Published in: ActionScript 3
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  1. public static function resampleBitmapData (bmp:BitmapData, ratio:Number, transparent:Boolean = true):BitmapData {
  2. 	if (ratio >= 1) {
  3. 		return (BitmapManager.resizeBitmapData(bmp, ratio, transparent));
  4. 	}
  5. 	else {
  6. 		var bmpData:BitmapData 	= bmp.clone();
  7. 		var appliedRatio:Number = 1;
  8.  
  9. 		do {
  10. 			if (ratio < 0.5 * appliedRatio) {
  11. 				bmpData = BitmapManager.resizeBitmapData(bmpData, 0.5, transparent);
  12. 				appliedRatio = 0.5 * appliedRatio;
  13. 			}
  14. 			else {
  15. 				bmpData = BitmapManager.resizeBitmapData(bmpData, ratio / appliedRatio, transparent);
  16. 				appliedRatio = ratio;
  17. 			}
  18. 		} while (appliedRatio != ratio);
  19.  
  20. 		return (bmpData);
  21. 	}
  22. }

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