<?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\image\gif;
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class Gif
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{
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/**
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* GIF帧列表
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*
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* @var array
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*/
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private $frames = [];
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/**
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* 每帧等待时间列表
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*
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* @var array
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*/
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private $delays = [];
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/**
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* 构造方法，用于解码GIF图片
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*
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* @param string $src GIF图片数据
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* @param string $mod 图片数据类型
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* @throws \Exception
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*/
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public function __construct($src = null, $mod = 'url')
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{
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if (!is_null($src)) {
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if ('url' == $mod && is_file($src)) {
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$src = file_get_contents($src);
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}
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/* 解码GIF图片 */
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try {
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$de = new Decoder($src);
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$this->frames = $de->getFrames();
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$this->delays = $de->getDelays();
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} catch (\Exception $e) {
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throw new \Exception("解码GIF图片出错");
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}
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}
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}
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/**
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* 设置或获取当前帧的数据
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*
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* @param string $stream 二进制数据流
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* @return mixed 获取到的数据
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*/
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public function image($stream = null)
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{
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if (is_null($stream)) {
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$current = current($this->frames);
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return false === $current ? reset($this->frames) : $current;
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}
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$this->frames[key($this->frames)] = $stream;
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}
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/**
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* 将当前帧移动到下一帧
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*
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* @return string 当前帧数据
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*/
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public function nextImage()
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{
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return next($this->frames);
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}
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/**
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* 编码并保存当前GIF图片
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*
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* @param string $pathname 图片名称
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*/
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public function save($pathname)
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{
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$gif = new Encoder($this->frames, $this->delays, 0, 2, 0, 0, 0, 'bin');
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file_put_contents($pathname, $gif->getAnimation());
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}
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}
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