cocos2d-x lua裁剪图片

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--创建裁剪图片（要裁剪的形状,大小）
function HeadSprite:createClipImage(clippingfile，size )
    
    local sp = HeadSprite.new()
        local sprender = cc.Sprite:create("my.png")
    sp.size = size 
    

    --创建裁剪
    local strClip = "head_mask.png"
    if nil ~= clippingfile then
        strClip = clippingfile
    end
    local clipSp = nil
    local frame = cc.SpriteFrameCache:getInstance():getSpriteFrame(strClip)
    if nil ~= frame then
        clipSp = cc.Sprite:createWithSpriteFrame(frame)
    else
        clipSp = cc.Sprite:create(strClip)
    end
    if nil ~= clipSp then
        --裁剪
        local clip = cc.ClippingNode:create()
        clip:setStencil(clipSp)
        clip:setAlphaThreshold(0)
        clip:addChild(sprender)
        local selfSize = sp:getContentSize()
        clip:setPosition(cc.p(selfSize.width * 0.5, selfSize.height * 0.5))
        sp:addChild(clip)
        return sp
    end
    return nil
end