IBitmapDrawable.draw inconsistency - Flash vs. Windows

I've found inconsistent behavior between Flash and Windows targets when using draw() with a matrix, when the target point is in the negative x axis.

Here's a comparison between the two targets:


And here's the code that produces it:

var source = new BitmapData(200, 50, false, 0x000000);
var target = new BitmapData(200, 200, false, 0x999999);

target.draw(source); // draw an instance at x=0

var m = new Matrix();
m.translate(50, 60);
target.draw(source, m); // draw an instance at x=50

m = new Matrix();
m.translate(-50, 120);
target.draw(source, m); // draw an instance at x=-50 - fails on Windows target

var b = new Bitmap(target);
b.x = 100;
b.y = 20;
Lib.current.addChild(b);

As you can see, Flash does the expected behavior - always drawing the visible area of the black box. Windows (and other cpp targets I expect) fail to draw the 3rd block, which is placed 'off-screen'.

I did a quick test and this problem doesn't seem to occur when the image is in the negative y axis.

This has consequences when for instance trying to use draw() with animated spritesheets with transparency, so I'm having to do some workarounds right now.