640 lines
19 KiB
PHP
640 lines
19 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2016 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: 麦当苗儿 <zuojiazi.cn@gmail.com> <http://www.zjzit.cn>
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// +----------------------------------------------------------------------
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namespace org\image\driver;
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use Exception;
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class Gd
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{
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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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private $im;
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/**
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* @var $git org\image\driver\Gif
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*/
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private $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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private $info;
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/**
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* 构造方法，可用于打开一张图像
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*
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* @param string $imgname 图像路径
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*/
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public function __construct($imgname = null)
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{
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$imgname && $this->open($imgname);
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}
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/**
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* 打开一张图像
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*
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* @param string $imgname 图像路径
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*
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* @return $this
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* @throws \Exception
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*/
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public function open($imgname)
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{
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//检测图像文件
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if (!is_file($imgname)) {
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throw new \Exception('不存在的图像文件');
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}
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//获取图像信息
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$info = getimagesize($imgname);
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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 Exception('非法图像文件');
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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' => $info['mime'],
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];
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//销毁已存在的图像
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empty($this->im) || imagedestroy($this->im);
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//打开图像
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if ('gif' == $this->info['type']) {
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$class = '\\Think\\Image\\Driver\\Gif';
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$this->gif = new $class($imgname);
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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 = $fun($imgname);
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}
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return $this;
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}
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/**
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* 保存图像
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*
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* @param string $imgname 图像保存名称
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* @param string $type 图像类型
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* @param boolean $interlace 是否对JPEG类型图像设置隔行扫描
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*
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* @return $this
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* @throws Exception
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*/
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public function save($imgname, $type = null, $interlace = true)
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{
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if (empty($this->im)) {
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throw new Exception('没有可以被保存的图像资源');
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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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//JPEG图像设置隔行扫描
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if ('jpeg' == $type || 'jpg' == $type) {
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$type = 'jpeg';
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imageinterlace($this->im, $interlace);
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}
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//保存图像
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if ('gif' == $type && !empty($this->gif)) {
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$this->gif->save($imgname);
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} else {
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$fun = "image{$type}";
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$fun($this->im, $imgname);
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}
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return $this;
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}
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/**
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* 返回图像宽度
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* @return int 图像宽度
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* @throws Exception
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*/
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public function width()
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{
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if (empty($this->im)) {
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throw new Exception('没有指定图像资源');
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}
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return $this->info['width'];
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}
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/**
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* 返回图像高度
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* @return int 图像高度
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* @throws Exception
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*/
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public function height()
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{
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if (empty($this->im)) {
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throw new Exception('没有指定图像资源');
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}
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return $this->info['height'];
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}
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/**
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* 返回图像类型
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* @return string 图像类型
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* @throws Exception
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*/
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public function type()
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{
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if (empty($this->im)) {
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throw new Exception('没有指定图像资源');
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}
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return $this->info['type'];
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}
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/**
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* 返回图像MIME类型
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* @return string 图像MIME类型
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* @throws Exception
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*/
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public function mime()
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{
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if (empty($this->im)) {
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throw new Exception('没有指定图像资源');
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}
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return $this->info['mime'];
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}
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/**
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* 返回图像尺寸数组 0 - 图像宽度，1 - 图像高度
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* @return array 图像尺寸
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* @throws Exception
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*/
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public function size()
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{
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if (empty($this->im)) {
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throw new Exception('没有指定图像资源');
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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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* 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 $this
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* @throws Exception
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*/
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public function crop($w, $h, $x = 0, $y = 0, $width = null, $height = null)
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{
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if (empty($this->im)) {
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throw new Exception('没有可以被裁剪的图像资源');
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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'] = $width;
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$this->info['height'] = $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 $this
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* @throws Exception
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*/
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public function thumb($width, $height, $type = THINKIMAGE_THUMB_SCALING)
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{
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if (empty($this->im)) {
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throw new Exception('没有可以被缩略的图像资源');
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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 THINKIMAGE_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 < $height) {
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return false;
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}
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//计算缩放比例
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$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 * $scale;
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break;
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/* 居中裁剪 */
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case THINKIMAGE_THUMB_CENTER:
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//计算缩放比例
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$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'] - $h) / 2;
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break;
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/* 左上角裁剪 */
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case THINKIMAGE_THUMB_NORTHWEST:
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//计算缩放比例
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$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 / $scale;
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break;
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/* 右下角裁剪 */
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case THINKIMAGE_THUMB_SOUTHEAST:
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//计算缩放比例
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$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'] - $h;
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break;
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/* 填充 */
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case THINKIMAGE_THUMB_FILLED:
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//计算缩放比例
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if ($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 * $scale;
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$newh = $h * $scale;
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$x = $this->info['width'] - $w;
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$y = $this->info['height'] - $h;
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$posx = ($width - $w * $scale) / 2;
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$posy = ($height - $h * $scale) / 2;
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do {
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//创建新图像
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$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, $posx, $posy, $x, $y, $neww, $newh, $w, $h);
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imagedestroy($this->im); //销毁原图
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$this->im = $img;
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} while (!empty($this->gif) && $this->gifNext());
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$this->info['width'] = $width;
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$this->info['height'] = $height;
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return $this;
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/* 固定 */
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case THINKIMAGE_THUMB_FIXED:
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$x = $y = 0;
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break;
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default:
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throw new Exception('不支持的缩略图裁剪类型');
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}
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/* 裁剪图像 */
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$this->crop($w, $h, $x, $y, $width, $height);
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return $this;
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}
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/**
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* 添加水印
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*
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* @param string $source 水印图片路径
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* @param int $locate 水印位置
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*
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* @return $this
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* @throws Exception
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* @internal param int $alpha 水印透明度
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*/
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public function water($source, $locate = THINKIMAGE_WATER_SOUTHEAST)
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{
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//资源检测
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if (empty($this->im)) {
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throw new Exception('没有可以被添加水印的图像资源');
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}
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if (!is_file($source)) {
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throw new Exception('水印图像不存在');
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}
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//获取水印图像信息
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$info = getimagesize($source);
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if (false === $info || (IMAGETYPE_GIF === $info[2] && empty($info['bits']))) {
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throw new Exception('非法水印文件');
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}
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//创建水印图像资源
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$fun = 'imagecreatefrom' . image_type_to_extension($info[2], false);
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$water = $fun($source);
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//设定水印图像的混色模式
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imagealphablending($water, true);
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/* 设定水印位置 */
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switch ($locate) {
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/* 右下角水印 */
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case THINKIMAGE_WATER_SOUTHEAST:
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$x = $this->info['width'] - $info[0];
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$y = $this->info['height'] - $info[1];
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break;
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/* 左下角水印 */
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case THINKIMAGE_WATER_SOUTHWEST:
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$x = 0;
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$y = $this->info['height'] - $info[1];
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break;
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/* 左上角水印 */
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case THINKIMAGE_WATER_NORTHWEST:
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$x = $y = 0;
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break;
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/* 右上角水印 */
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case THINKIMAGE_WATER_NORTHEAST:
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$x = $this->info['width'] - $info[0];
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$y = 0;
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break;
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/* 居中水印 */
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case THINKIMAGE_WATER_CENTER:
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$x = ($this->info['width'] - $info[0]) / 2;
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$y = ($this->info['height'] - $info[1]) / 2;
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break;
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/* 下居中水印 */
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case THINKIMAGE_WATER_SOUTH:
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$x = ($this->info['width'] - $info[0]) / 2;
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$y = $this->info['height'] - $info[1];
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break;
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/* 右居中水印 */
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case THINKIMAGE_WATER_EAST:
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$x = $this->info['width'] - $info[0];
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$y = ($this->info['height'] - $info[1]) / 2;
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break;
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/* 上居中水印 */
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case THINKIMAGE_WATER_NORTH:
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$x = ($this->info['width'] - $info[0]) / 2;
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$y = 0;
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break;
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/* 左居中水印 */
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case THINKIMAGE_WATER_WEST:
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$x = 0;
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$y = ($this->info['height'] - $info[1]) / 2;
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break;
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default:
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/* 自定义水印坐标 */
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if (is_array($locate)) {
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list($x, $y) = $locate;
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} else {
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throw new Exception('不支持的水印位置类型');
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}
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}
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do {
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//添加水印
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$src = imagecreatetruecolor($info[0], $info[1]);
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// 调整默认颜色
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$color = imagecolorallocate($src, 255, 255, 255);
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imagefill($src, 0, 0, $color);
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imagecopy($src, $this->im, 0, 0, $x, $y, $info[0], $info[1]);
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imagecopy($src, $water, 0, 0, 0, 0, $info[0], $info[1]);
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imagecopymerge($this->im, $src, $x, $y, 0, 0, $info[0], $info[1], 100);
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//销毁零时图片资源
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imagedestroy($src);
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} while (!empty($this->gif) && $this->gifNext());
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//销毁水印资源
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imagedestroy($water);
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return $this;
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}
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/**
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* 图像添加文字
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*
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* @param string $text 添加的文字
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* @param string $font 字体路径
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* @param integer $size 字号
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* @param string $color 文字颜色
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* @param int $locate 文字写入位置
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* @param integer $offset 文字相对当前位置的偏移量
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* @param integer $angle 文字倾斜角度
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*
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* @return $this
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* @throws Exception
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*/
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public function text($text, $font, $size, $color = '#00000000',
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$locate = THINKIMAGE_WATER_SOUTHEAST, $offset = 0, $angle = 0) {
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//资源检测
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if (empty($this->im)) {
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throw new Exception('没有可以被写入文字的图像资源');
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}
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if (!is_file($font)) {
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throw new Exception("不存在的字体文件：{$font}");
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}
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//获取文字信息
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$info = imagettfbbox($size, $angle, $font, $text);
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$minx = min($info[0], $info[2], $info[4], $info[6]);
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$maxx = max($info[0], $info[2], $info[4], $info[6]);
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$miny = min($info[1], $info[3], $info[5], $info[7]);
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$maxy = max($info[1], $info[3], $info[5], $info[7]);
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/* 计算文字初始坐标和尺寸 */
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$x = $minx;
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$y = abs($miny);
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$w = $maxx - $minx;
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$h = $maxy - $miny;
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/* 设定文字位置 */
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switch ($locate) {
|
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/* 右下角文字 */
|
||
case THINKIMAGE_WATER_SOUTHEAST:
|
||
$x += $this->info['width'] - $w;
|
||
$y += $this->info['height'] - $h;
|
||
break;
|
||
|
||
/* 左下角文字 */
|
||
case THINKIMAGE_WATER_SOUTHWEST:
|
||
$y += $this->info['height'] - $h;
|
||
break;
|
||
|
||
/* 左上角文字 */
|
||
case THINKIMAGE_WATER_NORTHWEST:
|
||
// 起始坐标即为左上角坐标，无需调整
|
||
break;
|
||
|
||
/* 右上角文字 */
|
||
case THINKIMAGE_WATER_NORTHEAST:
|
||
$x += $this->info['width'] - $w;
|
||
break;
|
||
|
||
/* 居中文字 */
|
||
case THINKIMAGE_WATER_CENTER:
|
||
$x += ($this->info['width'] - $w) / 2;
|
||
$y += ($this->info['height'] - $h) / 2;
|
||
break;
|
||
|
||
/* 下居中文字 */
|
||
case THINKIMAGE_WATER_SOUTH:
|
||
$x += ($this->info['width'] - $w) / 2;
|
||
$y += $this->info['height'] - $h;
|
||
break;
|
||
|
||
/* 右居中文字 */
|
||
case THINKIMAGE_WATER_EAST:
|
||
$x += $this->info['width'] - $w;
|
||
$y += ($this->info['height'] - $h) / 2;
|
||
break;
|
||
|
||
/* 上居中文字 */
|
||
case THINKIMAGE_WATER_NORTH:
|
||
$x += ($this->info['width'] - $w) / 2;
|
||
break;
|
||
|
||
/* 左居中文字 */
|
||
case THINKIMAGE_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 += $posy;
|
||
} else {
|
||
throw new Exception('不支持的文字位置类型');
|
||
}
|
||
}
|
||
|
||
/* 设置偏移量 */
|
||
if (is_array($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 Exception('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 $this;
|
||
}
|
||
|
||
/* 切换到GIF的下一帧并保存当前帧，内部使用 */
|
||
private function gifNext()
|
||
{
|
||
ob_start();
|
||
ob_implicit_flush(0);
|
||
imagegif($this->im);
|
||
$img = ob_get_clean();
|
||
|
||
$this->gif->image($img);
|
||
$next = $this->gif->nextImage();
|
||
|
||
if ($next) {
|
||
$this->im = imagecreatefromstring($next);
|
||
return $next;
|
||
} else {
|
||
$this->im = imagecreatefromstring($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);
|
||
}
|
||
}
|