ShearPhoto明哥新写的图片压缩类【原创】

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/*
 * 作者：明哥
 * 明哥身份:全栈高级总工程师
 * 明哥图片处理类
 * 开发时间2017/8/3
 * 版本 1.0
 */
class Image {
	protected $img_mime;
	protected $img_from;
	protected $img_to;
	protected $img_target;
	protected $error = false;
	final function __destruct() {
		$this -> unImg();
	}

	final function __call($function_name, $args) {

	}

	/*
	 * 裁入图片
	 * @param $img 图路径
	 */
	public function open($img) {
		$type = gettype($img);
		$this -> unImg();
		if ($type == "string") {
			$this -> img_mime = @getimagesize($img);
			if (is_array($this -> img_mime)) {
				$type = $this -> img_mime[2];
				$this -> img_from = $this -> imagecreatefrom($img, $type);
				$this -> img_mime["type"] = image_type_to_extension($type);
				$this -> error = false;
				return $this;
			}
		}
		$this -> error = true;
		return $this;
	}

	/*
	 * 核心处理
	 * @param $w 图像处理后最终宽度
	 * @param $h 图像处理后最终高度
	 * @param $corpType 剪裁类型 ，只有设置为4  X 和Y才有效
	 * @param $x 剪裁的X
	 * @param $y 剪裁的Y
	 */
	protected function core($w, $h, $cropType, $x = 0, $y = 0) {
		if (!$this -> img_from && !$this -> img_target) {
			return $this;
		}
		$w = (int)trim($w);
		$h = (int)trim($h);
		if ($this -> img_to and ($this -> img_to[0] != $this -> img_target[0])) {
			imagedestroy($this -> img_to[0]);
			$this -> img_to = null;
		}
		if (!$w || !$h) {
			$this -> error = true;
			return $this;
		}
		$this -> handleImg($w, $h, $cropType, $x, $y);
		return $this;

	}

	/*
	 * 缩略图
	 * @param $w 图像处理后最终宽度
	 * @param $h 图像处理后最终高度
	 * @param $cropType 剪裁的类型
	 */
	public function thumb($w, $h, $cropType = 3) {
		return $this -> core($w, $h, $cropType);
	}

	/*
	 * 剪裁
	 * @param $w 图像处理后最终宽度
	 * @param $h 图像处理后最终高度
	 * @param $x 剪裁的X
	 * @param $y 剪裁的Y
	 */
	public function crop($w, $h, $x = 0, $y = 0) {
		return $this -> core($w, $h, 4, $x, $y);
	}

	/*
	 * 剪裁
	 * @param $saveUrl 图像url
	 * @param $quality 图像质量
	 */
	public function save($saveUrl, $quality = 85) {
		if (!$this -> img_to or empty($saveUrl)) {
			$this -> error = true;
			return $this;
		}
		$img_to = $this -> img_to;
		$GD = $this -> getGD($saveUrl);
		if ($GD == "imagejpeg") {
			$is = @call_user_func($GD, $img_to[0], $saveUrl, $quality);

		} else {
			$is = @call_user_func($GD, $img_to[0], $saveUrl);
		}
		$this -> error = !$is;
		return $this;
	}

	public function getError() {
		return $this -> error;
	}

	public function unImg() {
		if ($this -> img_from) {
			imagedestroy($this -> img_from[0]);
			$this -> img_from = null;
		}
		$isTwins = false;
		if ($this -> img_to) {
			$isTwins = $this -> img_target[0] == $this -> img_to[0];
			imagedestroy($this -> img_to[0]);
			$this -> img_to = null;
		}
		if ($this -> img_target) {
			if (!$isTwins) {
				imagedestroy($this -> img_target[0]);
			}

			$this -> img_target = null;
		}

		$this -> img_mime = null;
		$this -> error = false;
		return $this;
	}

	public function get_img_from() {
		return $this -> img_from ? $this -> img_from : null;
	}

	public function get_img_to() {
		return $this -> img_to;
	}

	public function width() {
		return $this -> img_mime ? $this -> img_mime[0] : null;
	}

	public function height() {
		return $this -> img_mime ? $this -> img_mime[1] : null;
	}

	public function type() {
		return $this -> img_mime ? $this -> img_mime["type"] : null;
	}

	public function mime() {
		return $this -> img_mime ? $this -> img_mime : null;
	}

	public function size() {
		list($w, $h) = $this -> img_mime;
		return array($w, $h);
	}

	public function target($int = 2) {
		$this -> img_target = $int == 2 ? $this -> img_to : null;
		return $this;
	}

	protected function getGD($saveUrl) {
		$ext = pathinfo($saveUrl, PATHINFO_EXTENSION);
		switch ($ext) {
			case 'jpg' :
			case 'jpeg' :
				return "imagejpeg";
			case 'gif' :
				return "imagegif";
			case 'png' :
				return "imagepng";
			default :
				return $this -> img_from[1];
		}
	}

	protected function imagecreatefrom($url, $type) {
		switch ($type) {
			case 1 :
				$src = @imagecreatefromgif($url);
				$GdFun = "imagegif";
				break;

			case 2 :
				$src = @imagecreatefromjpeg($url);
				$GdFun = "imagejpeg";
				break;

			case 3 :
				$src = @imagecreatefrompng($url);
				$GdFun = "imagepng";
				break;

			default :
				$this -> error = true;
				return false;
		}
		return array($src, $GdFun);
	}

	protected function createBg($im, $r, $g, $b) {
		imagefill($im, 0, 0, imagecolorallocate($im, $r, $g, $b));
	}

	protected function handleImg($w, $h, $cropType = 3, $x = 0, $y = 0) {
		$img_to = @imagecreatetruecolor($w, $h);
		$this -> createBg($img_to, 255, 255, 255);
		if ($this -> img_target) {
			$dest = $this -> img_target[0];
			$dw = $this -> img_target[1];
			$dh = $this -> img_target[2];
		} else {
			$dest = $this -> img_from[0];
			list($dw, $dh) = $this -> img_mime;
		}
		list($cropW, $cropH, $l, $t) = $this -> getCrop($w, $h, $dw, $dh, $cropType, $x, $y);
		$imagecopy = @imagecopyresampled($img_to, $dest, $l, $t, 0, 0, $cropW, $cropH, $dw, $dh);
		if ($imagecopy) {
			$this -> img_to = array($img_to, $w, $h);
			$this -> error = false;
		} else {
			$this -> error = true;
		}

	}

	protected function cropCenter($w, $h, $dw, $dh) {
		$proportion = bcdiv($dw, $dh);
		$cropH = $h;
		$cropW = bcmul($cropH, $proportion);
		if ($cropW < $w) {
			$cropW = $w;
			$cropH = bcdiv($w, $proportion);
		}
		return array($cropW, $cropH);
	}

	protected function getCrop($w, $h, $dw, $dh, $type, $x = 0, $y = 0) {
		switch ($type) {
			case 1 :
				//拉伸剪裁
				return array($w, $h, 0, 0);
			case 2 :
				//向左剪裁
				list($cropW, $cropH) = $this -> cropCenter($w, $h, $dw, $dh);
				return array($cropW, $cropH, 0, 0);
			case 4 :
				// 坐标剪裁
				return array($dw, $dh, $x, $y);
			case 3 :
			//居中剪裁
			default :
				list($cropW, $cropH) = $this -> cropCenter($w, $h, $dw, $dh);
				return array($cropW, $cropH, intval(bcdiv(bcsub($w, $cropW), 2)), intval(bcdiv(bcsub($h, $cropH), 2)));
		}

	}

}

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