Sprite for mask

[ashenemy]

Hello
help me please
The task is
There are 2 textures, both textures are obtained from the image
It is necessary that an oin from the bottom be a mask for another.
How not tried it does not work out
Example code

Quote

var maskSprite = maskFrame.sprite;
maskSprite.x = maskFrame.offset.x;
maskSprite.y = maskFrame.offset.y;
maskSprite.alpha = .5;
this.stage.addChild(maskSprite);
frame[i].sprite.mask = maskSprite;

this.stage.addChild(frame[i].sprite)