PHUIImageMaskView.php
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	<?php

	final class PHUIImageMaskView extends AphrontTagView {

	private $image;
	private $withMask;

	private $displayWidth;
	private $displayHeight;

	private $centerX;
	private $centerY;
	private $maskH;
	private $maskW;

	public function setImage($image) {
	$this->image = $image;
	return $this;
	}

	public function setDisplayWidth($width) {
	$this->displayWidth = $width;
	return $this;
	}

	public function setDisplayHeight($height) {
	$this->displayHeight = $height;
	return $this;
	}

	public function centerViewOnPoint($x, $y, $h, $w) {
	$this->centerX = $x;
	$this->centerY = $y;
	$this->maskH = $h;
	$this->maskW = $w;
	return $this;
	}

	public function withMask($mask) {
	$this->withMask = $mask;
	return $this;
	}

	protected function getTagName() {
	return 'div';
	}

	protected function getTagAttributes() {
	require_celerity_resource('phui-image-mask-css');

	$classes = array();
	$classes[] = 'phui-image-mask';

	$styles = array();
	$styles[] = 'height: '.$this->displayHeight.'px;';
	$styles[] = 'width: '.$this->displayWidth.'px;';

	return array(
	'class' => implode(' ', $classes),
	'styles' => implode(' ', $styles),
	);

	}

	protected function getTagContent() {

	/* Center it in the middle of the selected area */
	$center_x = round($this->centerX + ($this->maskW / 2));
	$center_y = round($this->centerY + ($this->maskH / 2));
	$center_x = round($center_x - ($this->displayWidth / 2));
	$center_y = round($center_y - ($this->displayHeight / 2));

	$center_x = -$center_x;
	$center_y = -$center_y;

	$classes = array();
	$classes[] = 'phui-image-mask-image';

	$styles = array();
	$styles[] = 'height: '.$this->displayHeight.'px;';
	$styles[] = 'width: '.$this->displayWidth.'px;';
	$styles[] = 'background-image: url('.$this->image.');';
	$styles[] = 'background-position: '.$center_x.'px '.$center_y.'px;';

	$mask = null;
	if ($this->withMask) {
	/* The mask is a 300px border around a transparent box.
	so we do the math here to position the box correctly. */
	$border = 300;
	$left = round((($this->displayWidth - $this->maskW) / 2) - $border);
	$top = round((($this->displayHeight - $this->maskH) / 2) - $border);

	$mstyles = array();
	$mstyles[] = 'left: '.$left.'px;';
	$mstyles[] = 'top: '.$top.'px;';
	$mstyles[] = 'height: '.$this->maskH.'px;';
	$mstyles[] = 'width: '.$this->maskW.'px;';

	$mask = phutil_tag(
	'span',
	array(
	'class' => 'phui-image-mask-mask',
	'style' => implode(' ', $mstyles),
	),
	null);
	}

	return phutil_tag(
	'div',
	array(
	'class' => implode(' ', $classes),
	'style' => implode(' ', $styles),
	),
	$mask);
	}
	}

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