138 lines
3.8 KiB
PHP
138 lines
3.8 KiB
PHP
<?php
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class image_blur{
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/**
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* 图片高斯模糊（适用于png/jpg/gif格式）
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* @param $srcImg 原图片
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* @param $savepath 保存路径
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* @param $savename 保存名字
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* @param $positon 模糊程度
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*
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*基于Martijn Frazer代码的扩充， 感谢 Martijn Frazer
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*/
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public function gaussian_blur($srcImg,$savepath=null,$savename=null,$blurFactor=3){
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$gdImageResource=$this->image_create_from_ext($srcImg);
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$srcImgObj=$this->blur($gdImageResource,$blurFactor);
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$temp = pathinfo($srcImg);
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$name = $temp['basename'];
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$path = $temp['dirname'];
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$exte = $temp['extension'];
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$savename = $savename ? $savename : $name;
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$savepath = $savepath ? $savepath : $path;
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$savepath = str_replace("picture","blur",$savepath);
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if(file_exists($savepath) === false)
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{
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$this->checkdir($savepath, 1 );
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}
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$savefile = $savepath .'/'. $savename;
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$srcinfo = @getimagesize($srcImg);
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switch ($srcinfo[2]) {
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case 1: imagegif($srcImgObj, $savefile); break;
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case 2: imagejpeg($srcImgObj, $savefile); break;
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case 3: imagepng($srcImgObj, $savefile); break;
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default: return '保存失败'; //保存失败
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}
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return $savefile;
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imagedestroy($srcImgObj);
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}
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/**
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* Strong Blur
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*
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* @param $gdImageResource 图片资源
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* @param $blurFactor 可选择的模糊程度
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* 可选择的模糊程度 0使用 3默认 超过5时 极其模糊
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* @return GD image 图片资源类型
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* @author Martijn Frazer, idea based on http://stackoverflow.com/a/20264482
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*/
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private function blur($gdImageResource, $blurFactor = 3)
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{
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// blurFactor has to be an integer
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$blurFactor = round($blurFactor);
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$originalWidth = imagesx($gdImageResource);
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$originalHeight = imagesy($gdImageResource);
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$smallestWidth = ceil($originalWidth * pow(0.5, $blurFactor));
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$smallestHeight = ceil($originalHeight * pow(0.5, $blurFactor));
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// for the first run, the previous image is the original input
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$prevImage = $gdImageResource;
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$prevWidth = $originalWidth;
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$prevHeight = $originalHeight;
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// scale way down and gradually scale back up, blurring all the way
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for($i = 0; $i < $blurFactor; $i += 1)
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{
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// determine dimensions of next image
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$nextWidth = $smallestWidth * pow(2, $i);
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$nextHeight = $smallestHeight * pow(2, $i);
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// resize previous image to next size
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$nextImage = imagecreatetruecolor($nextWidth, $nextHeight);
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imagecopyresized($nextImage, $prevImage, 0, 0, 0, 0,
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$nextWidth, $nextHeight, $prevWidth, $prevHeight);
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// apply blur filter
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imagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR);
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// now the new image becomes the previous image for the next step
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$prevImage = $nextImage;
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$prevWidth = $nextWidth;
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$prevHeight = $nextHeight;
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}
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// scale back to original size and blur one more time
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imagecopyresized($gdImageResource, $nextImage,
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0, 0, 0, 0, $originalWidth, $originalHeight, $nextWidth, $nextHeight);
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imagefilter($gdImageResource, IMG_FILTER_GAUSSIAN_BLUR);
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// clean up
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imagedestroy($prevImage);
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// return result
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return $gdImageResource;
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}
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private function image_create_from_ext($imgfile)
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{
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$info = getimagesize($imgfile);
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$im = null;
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switch ($info[2]) {
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case 1: $im=imagecreatefromgif($imgfile); break;
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case 2: $im=imagecreatefromjpeg($imgfile); break;
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case 3: $im=imagecreatefrompng($imgfile); break;
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}
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return $im;
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}
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private function checkdir($dirname, $autocreate = false)
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{
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if (is_dir($dirname)) {
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return true;
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}
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else if (!$autocreate) {
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return false;
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}
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else {
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return $this->createdir($dirname, 511, true);
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}
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}
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private function createdir($dirname, $mode = 511, $recursive = false)
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{
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if (!$recursive) {
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$ret = @mkdir($dirname, $mode);
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if ($ret) {
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@chmod($dirname, $mode);
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}
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return $ret;
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}
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if (is_dir($dirname)) {
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return true;
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}
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else if ($this->createdir(dirname($dirname), $mode, true)) {
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$ret = @mkdir($dirname, $mode);
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if ($ret) {
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@chmod($dirname, $mode);
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}
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return $ret;
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}
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else {
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return false;
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}
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}
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}
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?>
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