mirror of
https://github.com/icret/EasyImages2.0.git
synced 2025-01-08 11:58:03 +08:00
358 lines
12 KiB
PHP
358 lines
12 KiB
PHP
<?php
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// https://blog.csdn.net/MyDream229/article/details/80009012
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class Imgs
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{
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/**
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* 取得图片宽
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* @param string $src 图片相对路径或绝对路径
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*/
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public static function get_width($src)
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{
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return imagesx($src);
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}
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/**
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* 取得图片高
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* @param string $src 图片相对路径或绝对路径
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*/
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public static function get_height($src)
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{
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return imagesy($src);
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}
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/**
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* 图片缩放函数
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* @param string $src 图片相对路径或绝对路径
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* @param int $w 缩略图宽
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* @param int $h 缩略图高
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* @return array code：状态。msg：提示信息
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**/
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public static function thumb($src, $w = null, $h = null)
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{
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if (empty($src)) {
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return array('code' => false, 'msg' => '请指定$src');
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}
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$temp = pathinfo($src);
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# 文件名
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$name = $temp["basename"];
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# 文件所在的文件夹
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$dir = $temp["dirname"];
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# 文件扩展名
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$extension = $temp["extension"];
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# 缩略图保存路径,新的文件名为*.thumb.jpg
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$savepath = "{$dir}/thumb_{$name}";
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# 获取图片的基本信息
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$info = getimagesize($src);
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# 获取图片宽度
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$width = $info[0];
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# 获取图片高度
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$height = $info[1];
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if (!empty($w)) {
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$temp_w = $w; # 计算原图缩放后的宽度
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$temp_h = intval($height * ($w / $width)); # 计算原图缩放后的高度
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} else {
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$temp_w = intval($width * ($h / $height)); # 计算原图缩放后的宽度
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$temp_h = $h; # 计算原图缩放后的高度
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}
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# 创建画布
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$temp_img = imagecreatetruecolor($temp_w, $temp_h);
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@imagealphablending($temp_img, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;3-2
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@imagesavealpha($temp_img, true); //这里很重要,意思是不要丢了$thumb图像的透明色;3-3
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switch ($info[2]) {
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case 1:
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$im = imagecreatefromgif($src);
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imagecopyresampled($temp_img, $im, 0, 0, 0, 0, $temp_w, $temp_h, $width, $height);
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imagegif($temp_img, $savepath, 100);
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break;
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case 2:
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$im = imagecreatefromjpeg($src);
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imagecopyresampled($temp_img, $im, 0, 0, 0, 0, $temp_w, $temp_h, $width, $height);
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imagejpeg($temp_img, $savepath, 100);
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break;
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case 3:
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$im = imagecreatefrompng($src);
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imagesavealpha($im, true); //这里很重要;3-1
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imagecopyresampled($temp_img, $im, 0, 0, 0, 0, $temp_w, $temp_h, $width, $height);
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imagepng($temp_img, $savepath, 100);
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break;
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case 6:
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$im = imagecreatefrombmp($src);
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imagesavealpha($im, true); //这里很重要;3-1
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imagecopyresampled($temp_img, $im, 0, 0, 0, 0, $temp_w, $temp_h, $width, $height);
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imagebmp($temp_img, $savepath, 100);
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break;
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case 18:
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$im = imagecreatefromwebp($src);
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imagesavealpha($im, true); //这里很重要;3-1
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imagecopyresampled($temp_img, $im, 0, 0, 0, 0, $temp_w, $temp_h, $width, $height);
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imagewebp($temp_img, $savepath, 100);
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break;
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}
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imagedestroy($im);
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return $savepath;
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}
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/**
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* 图片添加水印
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* @param string $src 1、图片相对路径或绝对路径 2、以逗号隔开的宽高值（'800,600'）
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* @param array 属性值：
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* res：水印资源（1、图片相对路径或绝对路径，2、字符串）
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* pos：图片水印添加的位置，取值范围：0~9
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* 0：随机位置，在1~8之间随机选取一个位置
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* 1：顶部居左 2：顶部居中
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* 3：顶部居右 4：左边居中
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* 5：图片中心 6：右边居中
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* 7：底部居左 8：底部居中
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* 9：底部居右
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* font： 字体库（相对路径或绝对路径）
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* fontSize：文字大小
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* color： 水印文字的字体颜色（255,255,255）
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* name： 图片保存名称
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* @return array code：状态、 msg：提示信息、 url:图片地址
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**/
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public static function setWater($src, $arr = array())
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{
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if (empty($src)) {
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return array('code' => false, 'msg' => '请指定$src');
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}
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$def = array(
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'res' => '小川编程',
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'pos' => 7,
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'font' => './1.ttf',
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'fontSize' => 24,
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'color' => '255,255,255,0',
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'name' => null,
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);
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$def = array_merge($def, $arr);
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/**
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* 判断$src是不是图片，不是就创建画布
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*/
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if (!file_exists($src)) {
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if (empty($def['name'])) {
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return array('code' => false, 'msg' => '请指定图片名称');
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}
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# 计算画布宽高
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$obj = explode(',', $src);
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if (count($obj) != 2) {
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return array(
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'code' => false,
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'msg' => '请给正确的宽高，或你给的不是一个有效的地址！'
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);
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}
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$srcImg_w = is_numeric($obj[0]) ? $obj[0] : 400;
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$srcImg_h = is_numeric($obj[1]) ? $obj[1] : 300;
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# 创建透明画布 一共3个步骤，在下边有标记
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$dst_img = @imagecreatetruecolor($srcImg_w, $srcImg_h);
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@imagealphablending($dst_img, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;3-2
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@imagesavealpha($dst_img, true); //这里很重要,意思是不要丢了$thumb图像的透明色;3-3
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} else {
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# 获取图片信息
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$srcInfo = @getimagesize($src);
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$srcImg_w = $srcInfo[0];
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$srcImg_h = $srcInfo[1];
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if (empty($def['name'])) {
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$def['name'] = $src;
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}
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# 动态的把图片导入内存中
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switch ($srcInfo[2]) {
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case 1:
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$dst_img = imagecreatefromgif($src);
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break;
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case 2:
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$dst_img = imagecreatefromjpeg($src);
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break;
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case 3:
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$dst_img = imagecreatefrompng($src);
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imagesavealpha($dst_img, true); //这里很重要;3-1
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break;
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case 6:
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$dst_img = imagecreatefrombmp($src);
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imagesavealpha($dst_img, true); //这里很重要;3-1
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break;
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case 18:
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$dst_img = imagecreatefromwebp($src);
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imagesavealpha($dst_img, true); //这里很重要;3-1
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break;
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default:
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return array('code' => false, 'msg' => '目标图片类型错误');
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exit;
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}
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}
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/**
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* 计算出水印宽高
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*/
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if (!file_exists($def['res'])) {
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if (!file_exists($def['font'])) {
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return array('code' => false, 'msg' => '字体库不存在');
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}
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$box = @imagettfbbox($def['fontSize'], 0, $def['font'], $def['res']);
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$logow = max($box[2], $box[4]) - min($box[0], $box[6]);
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$logoh = max($box[1], $box[3]) - min($box[5], $box[7]);
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} else {
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$resInfo = @getimagesize($def['res']);
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$res_w = $resInfo[0];
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$res_h = $resInfo[1];
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if ($srcImg_w < $res_w || $srcImg_h < $res_h) {
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return array('code' => false, 'msg' => '水印图片过大');
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}
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# 动态的把图片导入内存中
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switch ($resInfo[2]) {
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case 1:
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$markim = imagecreatefromgif($def['res']);
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break;
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case 2:
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$markim = imagecreatefromjpeg($def['res']);
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break;
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case 3:
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$markim = imagecreatefrompng($def['res']);
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break;
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case 6:
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$markim = imagecreatefrombmp($def['res']);
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break;
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case 18:
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$markim = imagecreatefromwebp($def['res']);
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break;
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default:
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return array('code' => false, 'msg' => '水印图片类型错误');
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exit;
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}
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$logow = $res_w;
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$logoh = $res_h;
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}
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/**
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* 计算水印显示位置
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*/
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if ($def['pos'] == 0) {
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$def['pos'] = rand(1, 9);
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}
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switch ($def['pos']) {
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case 1:
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$x = +10;
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$y = +10 + $def['fontSize'];
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break;
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case 2:
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$x = ($srcImg_w - $logow) / 2;
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$y = +10 + $def['fontSize'];
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break;
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case 3:
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$x = $srcImg_w - $logow - 10;
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$y = +10 + $def['fontSize'];
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break;
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case 4:
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$x = +10;
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$y = ($srcImg_h - $logoh) / 2 + $def['fontSize'];
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break;
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case 5:
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$x = ($srcImg_w - $logow) / 2;
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$y = ($srcImg_h - $logoh) / 2 + $def['fontSize'];
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break;
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case 6:
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$x = $srcImg_w - $logow - 10;
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$y = ($srcImg_h - $logoh) / 2 + $def['fontSize'];
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break;
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case 7:
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$x = +10;
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$y = $srcImg_h - $logoh + $def['fontSize'] - 10;
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break;
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case 8:
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$x = ($srcImg_w - $logow) / 2;
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$y = $srcImg_h - $logoh + $def['fontSize'] - 10;
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break;
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case 9:
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$x = $srcImg_w - $logow - 10;
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$y = $srcImg_h - $logoh + $def['fontSize'] - 10;
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break;
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default:
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return array('code' => false, 'msg' => '水印位置不支持');
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exit;
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}
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/**
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* 把图片水印或文字水印，加到目标图片中
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*/
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if (file_exists($def['res'])) {
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imagecopy($dst_img, $markim, $x, $y, 0, 0, $logow, $logoh);
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imagedestroy($markim);
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} else {
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$rgb = explode(',', $def['color']);
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if (count($rgb) != 4) {
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return array('code' => false, 'msg' => '请给正确的字体颜色');
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}
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if (!is_numeric($rgb[0]) || !is_numeric($rgb[1]) || !is_numeric($rgb[2]) || !is_numeric($rgb[3])) {
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return array('code' => false, 'msg' => '请给正确的字体颜色');
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}
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if ($rgb[0] > 255 || $rgb[1] > 255 || $rgb[2] > 255 || $rgb[3] > 127) {
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return array('code' => false, 'msg' => '请给正确的字体颜色');
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}
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// ceil(127 - 127 * $rgb[3]) 将CSS中的Alpha 0-1 转换为PHP Alpha 127-0 并取整
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$def['color'] = imagecolorallocatealpha($dst_img, $rgb[0], $rgb[1], $rgb[2], ceil(127 - 127 * $rgb[3]));
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imagettftext(
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$dst_img,
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$def['fontSize'],
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0,
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$x,
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$y,
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$def['color'],
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$def['font'],
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$def['res']
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);
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}
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/**
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* 保存处理过的图片（有水印了的图片）
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*/
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$name = explode('.', $def['name']);
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$num = count($name) - 1;
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switch (strtolower($name[$num])) {
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case 'jpeg':
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imagejpeg($dst_img, $def['name']);
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break;
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case 'jpg':
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imagejpeg($dst_img, $def['name']);
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break;
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case 'png':
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imagepng($dst_img, $def['name']);
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break;
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case 'gif':
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imagegif($dst_img, $def['name']);
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break;
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case 'bmp':
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imagebmp($dst_img, $def['name']);
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break;
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case 'webp':
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imagewebp($dst_img, $def['name']);
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break;
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default:
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return array('code' => false, 'msg' => '保存图片类型有误');
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break;
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}
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# 销毁图片内存资源
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imagedestroy($dst_img);
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return array('code' => true, 'msg' => '添加水印成功', 'url' => $def['name']);
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}
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}
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