611 lines
20 KiB
PHP
611 lines
20 KiB
PHP
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<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006-2015 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: yunwuxin <448901948@qq.com>
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// +----------------------------------------------------------------------
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namespace think;
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use think\image\Exception as ImageException;
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use think\image\gif\Gif;
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class Image
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{
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/* 缩略图相关常量定义 */
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const THUMB_SCALING = 1; //常量，标识缩略图等比例缩放类型
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const THUMB_FILLED = 2; //常量，标识缩略图缩放后填充类型
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const THUMB_CENTER = 3; //常量，标识缩略图居中裁剪类型
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const THUMB_NORTHWEST = 4; //常量，标识缩略图左上角裁剪类型
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const THUMB_SOUTHEAST = 5; //常量，标识缩略图右下角裁剪类型
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const THUMB_FIXED = 6; //常量，标识缩略图固定尺寸缩放类型
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/* 水印相关常量定义 */
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const WATER_NORTHWEST = 1; //常量，标识左上角水印
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const WATER_NORTH = 2; //常量，标识上居中水印
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const WATER_NORTHEAST = 3; //常量，标识右上角水印
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const WATER_WEST = 4; //常量，标识左居中水印
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const WATER_CENTER = 5; //常量，标识居中水印
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const WATER_EAST = 6; //常量，标识右居中水印
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const WATER_SOUTHWEST = 7; //常量，标识左下角水印
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const WATER_SOUTH = 8; //常量，标识下居中水印
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const WATER_SOUTHEAST = 9; //常量，标识右下角水印
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/* 翻转相关常量定义 */
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const FLIP_X = 1; //X轴翻转
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const FLIP_Y = 2; //Y轴翻转
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/**
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* 图像资源对象
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*
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* @var resource
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*/
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protected $im;
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/** @var Gif */
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protected $gif;
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/**
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* 图像信息，包括 width, height, type, mime, size
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*
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* @var array
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*/
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protected $info;
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protected function __construct(\SplFileInfo $file)
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{
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//获取图像信息
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$info = @getimagesize($file->getPathname());
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//检测图像合法性
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if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
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throw new ImageException('Illegal image file');
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}
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//设置图像信息
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$this->info = [
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'width' => $info[0],
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'height' => $info[1],
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'type' => image_type_to_extension($info[2], false),
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'mime' => $info['mime'],
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];
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//打开图像
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if ('gif' == $this->info['type']) {
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$this->gif = new Gif($file->getPathname());
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$this->im = @imagecreatefromstring($this->gif->image());
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} else {
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$fun = "imagecreatefrom{$this->info['type']}";
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$this->im = @$fun($file->getPathname());
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}
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if (empty($this->im)) {
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throw new ImageException('Failed to create image resources!');
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}
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}
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/**
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* 打开一个图片文件
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* @param \SplFileInfo|string $file
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* @return Image
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*/
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public static function open($file)
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{
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if (is_string($file)) {
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$file = new \SplFileInfo($file);
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}
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if (!$file->isFile()) {
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throw new ImageException('image file not exist');
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}
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return new self($file);
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}
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/**
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* 保存图像
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* @param string $pathname 图像保存路径名称
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* @param null|string $type 图像类型
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* @param int $quality 图像质量
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* @param bool $interlace 是否对JPEG类型图像设置隔行扫描
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* @return $this
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*/
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public function save($pathname, $type = null, $quality = 80, $interlace = true)
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{
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//自动获取图像类型
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if (is_null($type)) {
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$type = $this->info['type'];
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} else {
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$type = strtolower($type);
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}
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//保存图像
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if ('jpeg' == $type || 'jpg' == $type) {
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//JPEG图像设置隔行扫描
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imageinterlace($this->im, $interlace);
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imagejpeg($this->im, $pathname, $quality);
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} elseif ('gif' == $type && !empty($this->gif)) {
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$this->gif->save($pathname);
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} elseif ('png' == $type) {
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//设定保存完整的 alpha 通道信息
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imagesavealpha($this->im, true);
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//ImagePNG生成图像的质量范围从0到9的
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imagepng($this->im, $pathname, min((int) ($quality / 10), 9));
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} else {
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$fun = 'image' . $type;
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$fun($this->im, $pathname);
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}
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return $this;
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}
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/**
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* 返回图像宽度
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* @return int 图像宽度
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*/
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public function width()
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{
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return $this->info['width'];
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}
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/**
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* 返回图像高度
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* @return int 图像高度
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*/
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public function height()
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{
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return $this->info['height'];
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}
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/**
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* 返回图像类型
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* @return string 图像类型
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*/
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public function type()
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{
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return $this->info['type'];
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}
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/**
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* 返回图像MIME类型
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* @return string 图像MIME类型
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*/
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public function mime()
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{
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return $this->info['mime'];
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}
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/**
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* 返回图像尺寸数组 0 - 图像宽度，1 - 图像高度
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* @return array 图像尺寸
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*/
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public function size()
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{
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return [$this->info['width'], $this->info['height']];
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}
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/**
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* 旋转图像
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* @param int $degrees 顺时针旋转的度数
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* @return $this
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*/
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public function rotate($degrees = 90)
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{
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do {
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$img = imagerotate($this->im, -$degrees, imagecolorallocatealpha($this->im, 0, 0, 0, 127));
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imagedestroy($this->im);
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$this->im = $img;
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} while (!empty($this->gif) && $this->gifNext());
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$this->info['width'] = imagesx($this->im);
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$this->info['height'] = imagesy($this->im);
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return $this;
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}
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/**
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* 翻转图像
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* @param integer $direction 翻转轴,X或者Y
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* @return $this
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*/
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public function flip($direction = self::FLIP_X)
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{
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//原图宽度和高度
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$w = $this->info['width'];
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$h = $this->info['height'];
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do {
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$img = imagecreatetruecolor($w, $h);
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switch ($direction) {
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case self::FLIP_X:
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for ($y = 0; $y < $h; $y++) {
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imagecopy($img, $this->im, 0, $h - $y - 1, 0, $y, $w, 1);
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}
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break;
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case self::FLIP_Y:
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for ($x = 0; $x < $w; $x++) {
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imagecopy($img, $this->im, $w - $x - 1, 0, $x, 0, 1, $h);
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}
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break;
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default:
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throw new ImageException('不支持的翻转类型');
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}
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imagedestroy($this->im);
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$this->im = $img;
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} while (!empty($this->gif) && $this->gifNext());
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return $this;
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}
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/**
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* 裁剪图像
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*
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* @param integer $w 裁剪区域宽度
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* @param integer $h 裁剪区域高度
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* @param integer $x 裁剪区域x坐标
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* @param integer $y 裁剪区域y坐标
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* @param integer $width 图像保存宽度
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* @param integer $height 图像保存高度
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*
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* @return $this
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*/
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public function crop($w, $h, $x = 0, $y = 0, $width = null, $height = null)
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{
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//设置保存尺寸
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empty($width) && $width = $w;
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empty($height) && $height = $h;
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do {
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//创建新图像
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$img = imagecreatetruecolor($width, $height);
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// 调整默认颜色
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$color = imagecolorallocate($img, 255, 255, 255);
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imagefill($img, 0, 0, $color);
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//裁剪
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imagecopyresampled($img, $this->im, 0, 0, $x, $y, $width, $height, $w, $h);
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imagedestroy($this->im); //销毁原图
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//设置新图像
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$this->im = $img;
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} while (!empty($this->gif) && $this->gifNext());
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$this->info['width'] = (int) $width;
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$this->info['height'] = (int) $height;
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return $this;
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}
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/**
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* 生成缩略图
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*
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* @param integer $width 缩略图最大宽度
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* @param integer $height 缩略图最大高度
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* @param int $type 缩略图裁剪类型
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*
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* @return $this
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*/
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public function thumb($width, $height, $type = self::THUMB_SCALING)
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{
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//原图宽度和高度
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$w = $this->info['width'];
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$h = $this->info['height'];
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/* 计算缩略图生成的必要参数 */
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switch ($type) {
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/* 等比例缩放 */
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case self::THUMB_SCALING:
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//原图尺寸小于缩略图尺寸则不进行缩略
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if ($w < $width && $h < $height) {
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return $this;
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}
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//计算缩放比例
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$scale = min($width / $w, $height / $h);
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//设置缩略图的坐标及宽度和高度
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$x = $y = 0;
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$width = $w * $scale;
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$height = $h * $scale;
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break;
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/* 居中裁剪 */
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case self::THUMB_CENTER:
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//计算缩放比例
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$scale = max($width / $w, $height / $h);
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//设置缩略图的坐标及宽度和高度
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$w = $width / $scale;
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$h = $height / $scale;
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$x = ($this->info['width'] - $w) / 2;
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$y = ($this->info['height'] - $h) / 2;
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break;
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/* 左上角裁剪 */
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case self::THUMB_NORTHWEST:
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//计算缩放比例
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$scale = max($width / $w, $height / $h);
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//设置缩略图的坐标及宽度和高度
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$x = $y = 0;
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$w = $width / $scale;
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$h = $height / $scale;
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break;
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/* 右下角裁剪 */
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case self::THUMB_SOUTHEAST:
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//计算缩放比例
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$scale = max($width / $w, $height / $h);
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//设置缩略图的坐标及宽度和高度
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$w = $width / $scale;
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$h = $height / $scale;
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$x = $this->info['width'] - $w;
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$y = $this->info['height'] - $h;
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break;
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/* 填充 */
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case self::THUMB_FILLED:
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//计算缩放比例
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if ($w < $width && $h < $height) {
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$scale = 1;
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} else {
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$scale = min($width / $w, $height / $h);
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}
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//设置缩略图的坐标及宽度和高度
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|
|
$neww = $w * $scale;
|
|||
|
|
$newh = $h * $scale;
|
|||
|
|
$x = $this->info['width'] - $w;
|
|||
|
|
$y = $this->info['height'] - $h;
|
|||
|
|
$posx = ($width - $w * $scale) / 2;
|
|||
|
|
$posy = ($height - $h * $scale) / 2;
|
|||
|
|
do {
|
|||
|
|
//创建新图像
|
|||
|
|
$img = imagecreatetruecolor($width, $height);
|
|||
|
|
// 调整默认颜色
|
|||
|
|
$color = imagecolorallocate($img, 255, 255, 255);
|
|||
|
|
imagefill($img, 0, 0, $color);
|
|||
|
|
//裁剪
|
|||
|
|
imagecopyresampled($img, $this->im, $posx, $posy, $x, $y, $neww, $newh, $w, $h);
|
|||
|
|
imagedestroy($this->im); //销毁原图
|
|||
|
|
$this->im = $img;
|
|||
|
|
} while (!empty($this->gif) && $this->gifNext());
|
|||
|
|
$this->info['width'] = (int) $width;
|
|||
|
|
$this->info['height'] = (int) $height;
|
|||
|
|
return $this;
|
|||
|
|
/* 固定 */
|
|||
|
|
case self::THUMB_FIXED:
|
|||
|
|
$x = $y = 0;
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
throw new ImageException('不支持的缩略图裁剪类型');
|
|||
|
|
}
|
|||
|
|
/* 裁剪图像 */
|
|||
|
|
return $this->crop($w, $h, $x, $y, $width, $height);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 添加水印
|
|||
|
|
*
|
|||
|
|
* @param string $source 水印图片路径
|
|||
|
|
* @param int $locate 水印位置
|
|||
|
|
* @param int $alpha 透明度
|
|||
|
|
* @return $this
|
|||
|
|
*/
|
|||
|
|
public function water($source, $locate = self::WATER_SOUTHEAST, $alpha = 100)
|
|||
|
|
{
|
|||
|
|
if (!is_file($source)) {
|
|||
|
|
throw new ImageException('水印图像不存在');
|
|||
|
|
}
|
|||
|
|
//获取水印图像信息
|
|||
|
|
$info = getimagesize($source);
|
|||
|
|
if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
|
|||
|
|
throw new ImageException('非法水印文件');
|
|||
|
|
}
|
|||
|
|
//创建水印图像资源
|
|||
|
|
$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
|
|||
|
|
$water = $fun($source);
|
|||
|
|
//设定水印图像的混色模式
|
|||
|
|
imagealphablending($water, true);
|
|||
|
|
/* 设定水印位置 */
|
|||
|
|
switch ($locate) {
|
|||
|
|
/* 右下角水印 */
|
|||
|
|
case self::WATER_SOUTHEAST:
|
|||
|
|
$x = $this->info['width'] - $info[0];
|
|||
|
|
$y = $this->info['height'] - $info[1];
|
|||
|
|
break;
|
|||
|
|
/* 左下角水印 */
|
|||
|
|
case self::WATER_SOUTHWEST:
|
|||
|
|
$x = 0;
|
|||
|
|
$y = $this->info['height'] - $info[1];
|
|||
|
|
break;
|
|||
|
|
/* 左上角水印 */
|
|||
|
|
case self::WATER_NORTHWEST:
|
|||
|
|
$x = $y = 0;
|
|||
|
|
break;
|
|||
|
|
/* 右上角水印 */
|
|||
|
|
case self::WATER_NORTHEAST:
|
|||
|
|
$x = $this->info['width'] - $info[0];
|
|||
|
|
$y = 0;
|
|||
|
|
break;
|
|||
|
|
/* 居中水印 */
|
|||
|
|
case self::WATER_CENTER:
|
|||
|
|
$x = ($this->info['width'] - $info[0]) / 2;
|
|||
|
|
$y = ($this->info['height'] - $info[1]) / 2;
|
|||
|
|
break;
|
|||
|
|
/* 下居中水印 */
|
|||
|
|
case self::WATER_SOUTH:
|
|||
|
|
$x = ($this->info['width'] - $info[0]) / 2;
|
|||
|
|
$y = $this->info['height'] - $info[1];
|
|||
|
|
break;
|
|||
|
|
/* 右居中水印 */
|
|||
|
|
case self::WATER_EAST:
|
|||
|
|
$x = $this->info['width'] - $info[0];
|
|||
|
|
$y = ($this->info['height'] - $info[1]) / 2;
|
|||
|
|
break;
|
|||
|
|
/* 上居中水印 */
|
|||
|
|
case self::WATER_NORTH:
|
|||
|
|
$x = ($this->info['width'] - $info[0]) / 2;
|
|||
|
|
$y = 0;
|
|||
|
|
break;
|
|||
|
|
/* 左居中水印 */
|
|||
|
|
case self::WATER_WEST:
|
|||
|
|
$x = 0;
|
|||
|
|
$y = ($this->info['height'] - $info[1]) / 2;
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
/* 自定义水印坐标 */
|
|||
|
|
if (is_array($locate)) {
|
|||
|
|
list($x, $y) = $locate;
|
|||
|
|
} else {
|
|||
|
|
throw new ImageException('不支持的水印位置类型');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
do {
|
|||
|
|
//添加水印
|
|||
|
|
$src = imagecreatetruecolor($info[0], $info[1]);
|
|||
|
|
// 调整默认颜色
|
|||
|
|
$color = imagecolorallocate($src, 255, 255, 255);
|
|||
|
|
imagefill($src, 0, 0, $color);
|
|||
|
|
imagecopy($src, $this->im, 0, 0, $x, $y, $info[0], $info[1]);
|
|||
|
|
imagecopy($src, $water, 0, 0, 0, 0, $info[0], $info[1]);
|
|||
|
|
imagecopymerge($this->im, $src, $x, $y, 0, 0, $info[0], $info[1], $alpha);
|
|||
|
|
//销毁零时图片资源
|
|||
|
|
imagedestroy($src);
|
|||
|
|
} while (!empty($this->gif) && $this->gifNext());
|
|||
|
|
//销毁水印资源
|
|||
|
|
imagedestroy($water);
|
|||
|
|
return $this;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 图像添加文字
|
|||
|
|
*
|
|||
|
|
* @param string $text 添加的文字
|
|||
|
|
* @param string $font 字体路径
|
|||
|
|
* @param integer $size 字号
|
|||
|
|
* @param string $color 文字颜色
|
|||
|
|
* @param int $locate 文字写入位置
|
|||
|
|
* @param integer $offset 文字相对当前位置的偏移量
|
|||
|
|
* @param integer $angle 文字倾斜角度
|
|||
|
|
*
|
|||
|
|
* @return $this
|
|||
|
|
* @throws ImageException
|
|||
|
|
*/
|
|||
|
|
public function text($text, $font, $size, $color = '#00000000',
|
|||
|
|
$locate = self::WATER_SOUTHEAST, $offset = 0, $angle = 0) {
|
|||
|
|
|
|||
|
|
if (!is_file($font)) {
|
|||
|
|
throw new ImageException("不存在的字体文件：{$font}");
|
|||
|
|
}
|
|||
|
|
//获取文字信息
|
|||
|
|
$info = imagettfbbox($size, $angle, $font, $text);
|
|||
|
|
$minx = min($info[0], $info[2], $info[4], $info[6]);
|
|||
|
|
$maxx = max($info[0], $info[2], $info[4], $info[6]);
|
|||
|
|
$miny = min($info[1], $info[3], $info[5], $info[7]);
|
|||
|
|
$maxy = max($info[1], $info[3], $info[5], $info[7]);
|
|||
|
|
/* 计算文字初始坐标和尺寸 */
|
|||
|
|
$x = $minx;
|
|||
|
|
$y = abs($miny);
|
|||
|
|
$w = $maxx - $minx;
|
|||
|
|
$h = $maxy - $miny;
|
|||
|
|
/* 设定文字位置 */
|
|||
|
|
switch ($locate) {
|
|||
|
|
/* 右下角文字 */
|
|||
|
|
case self::WATER_SOUTHEAST:
|
|||
|
|
$x += $this->info['width'] - $w;
|
|||
|
|
$y += $this->info['height'] - $h;
|
|||
|
|
break;
|
|||
|
|
/* 左下角文字 */
|
|||
|
|
case self::WATER_SOUTHWEST:
|
|||
|
|
$y += $this->info['height'] - $h;
|
|||
|
|
break;
|
|||
|
|
/* 左上角文字 */
|
|||
|
|
case self::WATER_NORTHWEST:
|
|||
|
|
// 起始坐标即为左上角坐标，无需调整
|
|||
|
|
break;
|
|||
|
|
/* 右上角文字 */
|
|||
|
|
case self::WATER_NORTHEAST:
|
|||
|
|
$x += $this->info['width'] - $w;
|
|||
|
|
break;
|
|||
|
|
/* 居中文字 */
|
|||
|
|
case self::WATER_CENTER:
|
|||
|
|
$x += ($this->info['width'] - $w) / 2;
|
|||
|
|
$y += ($this->info['height'] - $h) / 2;
|
|||
|
|
break;
|
|||
|
|
/* 下居中文字 */
|
|||
|
|
case self::WATER_SOUTH:
|
|||
|
|
$x += ($this->info['width'] - $w) / 2;
|
|||
|
|
$y += $this->info['height'] - $h;
|
|||
|
|
break;
|
|||
|
|
/* 右居中文字 */
|
|||
|
|
case self::WATER_EAST:
|
|||
|
|
$x += $this->info['width'] - $w;
|
|||
|
|
$y += ($this->info['height'] - $h) / 2;
|
|||
|
|
break;
|
|||
|
|
/* 上居中文字 */
|
|||
|
|
case self::WATER_NORTH:
|
|||
|
|
$x += ($this->info['width'] - $w) / 2;
|
|||
|
|
break;
|
|||
|
|
/* 左居中文字 */
|
|||
|
|
case self::WATER_WEST:
|
|||
|
|
$y += ($this->info['height'] - $h) / 2;
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
/* 自定义文字坐标 */
|
|||
|
|
if (is_array($locate)) {
|
|||
|
|
list($posx, $posy) = $locate;
|
|||
|
|
$x += $posx;
|
|||
|
|
$y += $posy;
|
|||
|
|
} else {
|
|||
|
|
throw new ImageException('不支持的文字位置类型');
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/* 设置偏移量 */
|
|||
|
|
if (is_array($offset)) {
|
|||
|
|
$offset = array_map('intval', $offset);
|
|||
|
|
list($ox, $oy) = $offset;
|
|||
|
|
} else {
|
|||
|
|
$offset = intval($offset);
|
|||
|
|
$ox = $oy = $offset;
|
|||
|
|
}
|
|||
|
|
/* 设置颜色 */
|
|||
|
|
if (is_string($color) && 0 === strpos($color, '#')) {
|
|||
|
|
$color = str_split(substr($color, 1), 2);
|
|||
|
|
$color = array_map('hexdec', $color);
|
|||
|
|
if (empty($color[3]) || $color[3] > 127) {
|
|||
|
|
$color[3] = 0;
|
|||
|
|
}
|
|||
|
|
} elseif (!is_array($color)) {
|
|||
|
|
throw new ImageException('错误的颜色值');
|
|||
|
|
}
|
|||
|
|
do {
|
|||
|
|
/* 写入文字 */
|
|||
|
|
$col = imagecolorallocatealpha($this->im, $color[0], $color[1], $color[2], $color[3]);
|
|||
|
|
imagettftext($this->im, $size, $angle, $x + $ox, $y + $oy, $col, $font, $text);
|
|||
|
|
} while (!empty($this->gif) && $this->gifNext());
|
|||
|
|
return $this;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 切换到GIF的下一帧并保存当前帧
|
|||
|
|
*/
|
|||
|
|
protected function gifNext()
|
|||
|
|
{
|
|||
|
|
ob_start();
|
|||
|
|
ob_implicit_flush(0);
|
|||
|
|
imagegif($this->im);
|
|||
|
|
$img = ob_get_clean();
|
|||
|
|
$this->gif->image($img);
|
|||
|
|
$next = $this->gif->nextImage();
|
|||
|
|
if ($next) {
|
|||
|
|
imagedestroy($this->im);
|
|||
|
|
$this->im = imagecreatefromstring($next);
|
|||
|
|
return $next;
|
|||
|
|
} else {
|
|||
|
|
imagedestroy($this->im);
|
|||
|
|
$this->im = imagecreatefromstring($this->gif->image());
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 析构方法，用于销毁图像资源
|
|||
|
|
*/
|
|||
|
|
public function __destruct()
|
|||
|
|
{
|
|||
|
|
empty($this->im) || imagedestroy($this->im);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
}
|