缩略图支持webp
icret
parent
341cf72709
commit
7e581563a7
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@ -18,7 +18,8 @@
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// namespace Thumb;
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// https://github.com/aileshe/Thumb
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class Thumb{
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class Thumb
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{
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private static $img_type; # 原图片格式
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/**
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@ -28,9 +29,10 @@ class Thumb{
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* @param String $height 预生成缩略图高度
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* @param String $valign [middle|top|bottom],默认 居中
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*/
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public static function show($filename, $width, $height, $valign='middle'){
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public static function show($filename, $width, $height, $valign = 'middle')
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{
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$thumb = self::make($filename, $width, $height, $valign);
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header('Content-Type:image/'.self::$img_type);
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header('Content-Type:image/' . self::$img_type);
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echo $thumb;
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}
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@ -42,10 +44,11 @@ class Thumb{
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* @param String $height 预生成缩略图高度
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* @param String $valign [middle|top|bottom],默认 居中
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*/
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public static function out($filename, $output, $width, $height, $valign='middle'){
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public static function out($filename, $output, $width, $height, $valign = 'middle')
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{
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$thumb = self::make($filename, $width, $height, $valign);
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$fh = fopen($output, 'wb'); # 二进制文件
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fwrite($fh,$thumb);
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fwrite($fh, $thumb);
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fclose($fh);
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}
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@ -57,12 +60,13 @@ class Thumb{
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* @param String $height 预生成缩略图高度
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* @param String $valign [middle|top|bottom],默认 居中
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*/
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public static function showOut($filename, $output, $width, $height, $valign='middle'){
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public static function showOut($filename, $output, $width, $height, $valign = 'middle')
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{
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$thumb = self::make($filename, $width, $height, $valign);
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$fh = fopen($output, 'wb'); # 二进制文件
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fwrite($fh,$thumb);
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fwrite($fh, $thumb);
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fclose($fh);
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header('Content-Type:image/'.self::$img_type);
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header('Content-Type:image/' . self::$img_type);
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echo $thumb;
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}
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@ -74,62 +78,89 @@ class Thumb{
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* @param String $valign [middle|top|bottom],默认 居中
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* @return FileString 原始图象流
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*/
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private static function make($filename,$width,$height,$valign='middle'){
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ini_set('gd.jpeg_ignore_warning',true);
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$filetype=array(1=>'gif',2=>'jpeg',3=>'png');
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private static function make($filename, $width, $height, $valign = 'middle')
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{
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ini_set('gd.jpeg_ignore_warning', true);
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/**
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* 2022-1-4 23:34:37 EasyImage更改图像类型判断
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* getimagesize索引2给出的是图像的类型，返回的是数字
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* 1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，
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* 9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM
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*/
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$filetype = array(
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0 => 'unknown',
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1 => 'gif',
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2 => 'jpeg',
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3 => 'png',
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4 => 'swf',
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5 => 'psd',
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6 => 'bmp',
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7 => 'tif_ii',
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8 => 'tiff_mm',
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9 => 'jpc',
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10 => 'jp2',
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11 => 'jpx',
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12 => 'jb2',
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13 => 'swc',
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14 => 'iff',
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15 => 'wbmp',
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16 => 'xbm',
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17 => 'ico',
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18 => 'webp'
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);
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# 获取图片信息
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$imginfo=getimagesize($filename);
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$img_w=$imginfo[0];
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$img_h=$imginfo[1];
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self::$img_type=$filetype[$imginfo[2]];
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$imginfo = getimagesize($filename);
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$img_w = $imginfo[0];
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$img_h = $imginfo[1];
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self::$img_type = $filetype[$imginfo[2]];
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$thumb_h=$height; # 固定背景画布的高度
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$height=$img_h/($img_w/$width); # 图片等比例缩放后的高度=原图的高度÷(原图的宽度÷背景画布固定宽带)
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$thumb_h = $height; # 固定背景画布的高度
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$height = $img_h / ($img_w / $width); # 图片等比例缩放后的高度=原图的高度÷(原图的宽度÷背景画布固定宽带)
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# 创建新的背景画布
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if($height>=$thumb_h){
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$thumb=imagecreatetruecolor($width,$thumb_h);
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if ($height >= $thumb_h) {
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$thumb = imagecreatetruecolor($width, $thumb_h);
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@imagealphablending($thumb, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;2-1
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@imagesavealpha($thumb, true); //这里很重要,意思是不要丢了$thumb图像的透明色;2-2 EasyImage修改
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}else{
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$thumb=imagecreatetruecolor($width,$height);
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} else {
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$thumb = imagecreatetruecolor($width, $height);
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@imagealphablending($thumb, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;2-1
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@imagesavealpha($thumb, true); //这里很重要,意思是不要丢了$thumb图像的透明色;2-2 EasyImage修改
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$thumb_h=$height;
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$thumb_h = $height;
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}
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# 载入要缩放的图片
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$loadimg='imagecreatefrom'.self::$img_type;
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$tmp_img=$loadimg($filename);
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$loadimg = 'imagecreatefrom' . self::$img_type;
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$tmp_img = $loadimg($filename);
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switch($valign){
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case 'top':{
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$dst_y=0;
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switch ($valign) {
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case 'top': {
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$dst_y = 0;
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break;
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}
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case 'middle':{
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$dst_y=($img_h-$img_w/$width*$thumb_h)/2;
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case 'middle': {
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$dst_y = ($img_h - $img_w / $width * $thumb_h) / 2;
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break;
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}
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case 'bottom':{
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$dst_y=$img_h-$img_w/$width*$thumb_h;
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case 'bottom': {
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$dst_y = $img_h - $img_w / $width * $thumb_h;
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break;
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}
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default:{
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$dst_y=0;
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default: {
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$dst_y = 0;
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break;
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}
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}
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# 合成缩略图
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imagecopyresampled($thumb,$tmp_img,0,0,0,$dst_y,$width,$height, $img_w, $img_h);
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imagecopyresampled($thumb, $tmp_img, 0, 0, 0, $dst_y, $width, $height, $img_w, $img_h);
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ob_clean();
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# 展示图片
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ob_start();
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$showimg='image'.self::$img_type;
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$showimg = 'image' . self::$img_type;
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$showimg($thumb); # 输出原始图象流
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$thumb_img = ob_get_clean();
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