BitmapData.rectangle.height is given the wrong value (the width instead of the height).  The following haxe program demonstrates the problem:

 import flash.display.BitmapData;

 class Main {
     public static function main() {
         var b : BitmapData = new BitmapData(50, 60);
         trace("width = " + Std.string(b.width));
         trace("height = " + Std.string(b.height));
         trace("rectangle = " + Std.string(b.rectangle));
     }
 }

The expected output is:

 Main.hx:6: width = 50
 Main.hx:7: height = 60
 Main.hx:8: rectangle = (x=0, y=0, w=50, h=60)

The actual output with swfdec is:

 Main.hx:6: width = 50
 Main.hx:7: height = 60
 Main.hx:8: rectangle = (x=0, y=0, w=50, h=50)