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import { Bounds, DisplayObject } from '@pixi/display';
import { Rectangle } from '@pixi/math';
import { ObjectPoolFactory } from '@pixi-essentials/object-pool';

// Shared rectangle pool
const rectanglePool = ObjectPoolFactory.build(Rectangle);

// Temp bounds object to calculate the display-object's content bounds
const tempBounds = new Bounds();

// Temp rect to store children bounds
const tempRect = new Rectangle();

// Empty array to swap children
const EMPTY_ARRAY = [];

/**
 * It enable smart-masking, set this property. Before rendering the scene graph, you must invoke
 * {@code updateSmartMask} on each display-object to enable masking.
 *
 * @type {PIXI.DisplayObject}
 */
DisplayObject.prototype.smartMask = null;

/**
 * Update the mask of the display-object based on whether its unmasked bounds are not a subset of the
 * smart-mask's bounds or are.
 *
 * NOTE: Setting the smart-mask to null will not remove the mask on the display-object, if it has already
 * been enabled.
 *
 * @method PIXI.DisplayObject#updateSmartMask
 * @param recursive - whether to update the smart-masks of the children as well. Traversing the scene
 *      graph on your own is less optimized due to bounds recalculations.
 * @param skipUpdate - whether to not recalculate the transforms of each display-object. This is false
 *      by default because it is expected you will do this on your own.
 */
DisplayObject.prototype.updateSmartMask = function updateSmartMask(recursive = true, skipUpdate = true): Rectangle
{
    if (!this.smartMask)
    {
        if (recursive)
        {
            return this.getBounds(skipUpdate, rectanglePool.allocate());
        }

        return null;
    }

    const smartMask = this.smartMask;
    const maskBounds = rectanglePool.allocate();
    const unmaskedTargetBounds = rectanglePool.allocate();

    smartMask.getBounds(skipUpdate, maskBounds);

    if (!skipUpdate)
    {
        this._recursivePostUpdateTransform();

        if (!this.parent)
        {
            this.parent = this._tempDisplayObjectParent;
            this.displayObjectUpdateTransform();
            this.parent = null;
        }
        else
        {
            this.displayObjectUpdateTransform();
        }
    }

    // Match Container.calculateBounds except for not using the mask's bounds
    if (this.filterArea)
    {
        unmaskedTargetBounds.copyFrom(this.filterArea);
    }
    else
    {
        const originalBounds = this._bounds;
        const originalChildren = this.children;

        tempBounds.clear();
        this._bounds = tempBounds;
        this.children = EMPTY_ARRAY;
        this.calculateBounds();
        this._bounds = originalBounds;
        this.children = originalChildren;

        // copyFrom needed if Rectangle.EMPTY is returned
        unmaskedTargetBounds.copyFrom(tempBounds.getRectangle(unmaskedTargetBounds));
    }

    const children = this.children;

    if (children && children.length)
    {
        // Use recursion to both update the smart-masks of children & calculate the unmasked target bounds
        if (recursive)
        {
            for (let i = 0, j = children.length; i < j; i++)
            {
                const child = children[i];

                if (!child.renderable || !child.visible)
                {
                    continue;
                }

                const childBounds = child.updateSmartMask(true, skipUpdate);

                unmaskedTargetBounds.enlarge(childBounds);
                rectanglePool.release(childBounds);// Recursive updates require the caller to release the returned rectangle
            }
        }
        else
        {
            for (let i = 0, j = children.length; i < j; i++)
            {
                const child = children[i];

                if (!child.renderable || !child.visible)
                {
                    continue;
                }

                unmaskedTargetBounds.enlarge(child.getBounds(skipUpdate, tempRect));
            }
        }
    }

    if (unmaskedTargetBounds.left < maskBounds.left
            || unmaskedTargetBounds.top < maskBounds.top
            || unmaskedTargetBounds.right > maskBounds.right
            || unmaskedTargetBounds.bottom > maskBounds.bottom)
    {
        this.mask = smartMask;
    }
    else
    {
        this.mask = null;
    }

    if (recursive)
    {
        unmaskedTargetBounds.fit(maskBounds);
        rectanglePool.release(maskBounds);

        // NOTE: Recursive updates expect the caller to release to the child's calculated bounds rectangle.
        return unmaskedTargetBounds;
    }

    rectanglePool.release(maskBounds);
    rectanglePool.release(unmaskedTargetBounds);

    return null;
};