PHP全功能无变形图片裁剪操作类
发布时间：2018-04-14, 18:08:24 分类：PHP | 编辑 off 网址 | 辅助
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PHP浏览器中直接输出图片
注：imagejpeg（或imagepng）支持仅在PHP与GD-1.8或更高版本一起编译时可用。quality为可选项，jpeg范围从0（最差质量，文件更小）到100（最佳质量，文件最大），png范围从 0到9
PHP图片裁剪与缩放 / 无损裁剪图片
<?php
$old_img='old.gif'; //原图gif 问题
//downloadimg('http://***');
$new_img='afterCrop.jpg';//新缩略图
if(!file_exists($new_img)){
$ic=new ImageCrop($old_img,$new_img);
$ic->Crop(120,80,2);
$ic->SaveImage();
//$ic->SaveAlpha();将补白变成透明像素保存
$ic->destory();
}
showImg($new_img);
/*
* php 页面直接输出图片
*/
function showImg($img){
$info = getimagesize($img);
$imgExt = image_type_to_extension($info[2], false); //获取文件后缀
$fun = "imagecreatefrom{$imgExt}";
$imgInfo = $fun($img); //1.由文件或 URL 创建一个新图象。如:imagecreatefrompng ( string $filename )
//$mime = $info['mime'];
$mime = image_type_to_mime_type(exif_imagetype($img)); //获取图片的 MIME 类型
header('Content-Type:'.$mime);
$quality = 100;
if($imgExt == 'png') $quality = 9; //输出质量,JPEG格式(0-100),PNG格式(0-9)
$getImgInfo = "image{$imgExt}";
$getImgInfo($imgInfo, null, $quality); //2.将图像输出到浏览器或文件。如: imagepng ( resource $image )
imagedestroy($imgInfo);
}
//下载远程图片
function downloadimg($url, $path = '' ,$extn = '.png'){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
$file = curl_exec($ch);
curl_close($ch);
$filename = pathinfo($url, PATHINFO_BASENAME);
$ext = strrchr($filename,'.');//把图片名当做字符串来处理，那么判断图片格式的也就是变成了查找“.”号的字符串
if(!$ext){
$ext = $extn;
$filename .= $ext;
}
if(!$path){
$path=tempnam(sys_get_temp_dir(), 'dimg');//php保存到临时文件夹
rename($path, $path .= $filename);
}
$resource = fopen($path, 'a');
fwrite($resource, $file);
fclose($resource);
return $path;
}
/**
* Author : smallchicken
* mode 1 : 强制裁剪，生成图片严格按照需要，不足放大，超过裁剪，图片始终铺满
* mode 2 : 和1类似，但不足的时候 不放大 会产生补白，可以用png消除。
* mode 3 : 只缩放，不裁剪，保留全部图片信息，会产生补白，
* mode 4 : 只缩放，不裁剪，保留全部图片信息，生成图片大小为最终缩放后的图片有效信息的实际大小，不产生补白
* 默认补白为白色，如果要使补白成透明像素，请使用SaveAlpha()方法代替SaveImage()方法
*
* 调用方法：
*
* $ic=new ImageCrop('old.jpg','afterCrop.jpg');
* $ic->Crop(120,80,2);
* $ic->SaveImage();
* //$ic->SaveAlpha();将补白变成透明像素保存
* $ic->destory();
*
*
*/
class ImageCrop {
var $sImage;
var $dImage;
var $src_file;
var $dst_file;
var $src_width;
var $src_height;
var $src_ext;
var $src_type;
function ImageCrop($src_file,$dst_file='') {
$this->src_file=$src_file;
$this->dst_file=$dst_file;
$this->LoadImage();
}
function SetSrcFile($src_file) {
$this->src_file=$src_file;
}
function SetDstFile($dst_file) {
$this->dst_file=$dst_file;
}
function LoadImage() {
list($this->src_width, $this->src_height, $this->src_type) = getimagesize($this->src_file);
switch($this->src_type) {
case IMAGETYPE_JPEG :
$this->sImage=imagecreatefromjpeg($this->src_file);
$this->ext='jpg';
break;
case IMAGETYPE_PNG :
$this->sImage=imagecreatefrompng($this->src_file);
$this->ext='png';
break;
case IMAGETYPE_GIF :
$this->sImage=imagecreatefromgif($this->src_file);
$this->ext='gif';
break;
default:
exit();
}
}
function SaveImage($fileName='') {
$this->dst_file=$fileName ? $fileName : $this->dst_file;
switch($this->src_type) {
case IMAGETYPE_JPEG :
imagejpeg($this->dImage,$this->dst_file,100);
break;
case IMAGETYPE_PNG :
imagepng($this->dImage,$this->dst_file);
break;
case IMAGETYPE_GIF :
imagegif($this->dImage,$this->dst_file);
break;
default:
break;
}
}
function OutImage() {
switch($this->src_type) {
case IMAGETYPE_JPEG :
header('Content-type: image/jpeg');
imagejpeg($this->dImage);
break;
case IMAGETYPE_PNG :
header('Content-type: image/png');
imagepng($this->dImage);
break;
case IMAGETYPE_GIF :
header('Content-type: image/gif');
imagegif($this->dImage);
break;
default:
break;
}
}
function SaveAlpha($fileName='') {
$this->dst_file=$fileName ? $fileName . '.png' : $this->dst_file .'.png';
imagesavealpha($this->dImage, true);
imagepng($this->dImage,$this->dst_file);
}
function OutAlpha() {
imagesavealpha($this->dImage, true);
header('Content-type: image/png');
imagepng($this->dImage);
}
function destory() {
imagedestroy($this->sImage);
imagedestroy($this->dImage);
}
function Crop($dst_width,$dst_height,$mode=1,$dst_file='') {
if($dst_file) $this->dst_file=$dst_file;
$this->dImage = imagecreatetruecolor($dst_width,$dst_height);
$bg = imagecolorallocatealpha($this->dImage,255,255,255,127);
imagefill($this->dImage, 0, 0, $bg);
imagecolortransparent($this->dImage,$bg);
$ratio_w=1.0 * $dst_width / $this->src_width;
$ratio_h=1.0 * $dst_height / $this->src_height;
$ratio=1.0;
switch($mode) {
case 1: // always crop
if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)) {
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($dst_width / $ratio);
$tmp_h = (int)($dst_height / $ratio);
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);
$src_x = (int) (($this->src_width-$tmp_w)/2) ;
$src_y = (int) (($this->src_height-$tmp_h)/2) ;
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
} else {
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
$src_x = (int)($tmp_w - $dst_width) / 2 ;
$src_y = (int)($tmp_h - $dst_height) / 2 ;
imagecopy($this->dImage, $tmp_img, 0,0,$src_x,$src_y,$dst_width,$dst_height);
imagedestroy($tmp_img);
}
break;
case 2: // only small
if($ratio_w < 1 && $ratio_h < 1) {
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($dst_width / $ratio);
$tmp_h = (int)($dst_height / $ratio);
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);
$src_x = (int) ($this->src_width-$tmp_w)/2 ;
$src_y = (int) ($this->src_height-$tmp_h)/2 ;
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
} elseif($ratio_w > 1 && $ratio_h > 1) {
$dst_x = (int) abs($dst_width - $this->src_width) / 2 ;
$dst_y = (int) abs($dst_height -$this->src_height) / 2;
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,0,0,$this->src_width,$this->src_height);
} else {
$src_x=0;
$dst_x=0;
$src_y=0;
$dst_y=0;
if(($dst_width - $this->src_width) < 0) {
$src_x = (int) ($this->src_width - $dst_width)/2;
$dst_x =0;
} else {
$src_x =0;
$dst_x = (int) ($dst_width - $this->src_width)/2;
}
if( ($dst_height -$this->src_height) < 0) {
$src_y = (int) ($this->src_height - $dst_height)/2;
$dst_y = 0;
} else {
$src_y = 0;
$dst_y = (int) ($dst_height - $this->src_height)/2;
}
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,$src_x,$src_y,$this->src_width,$this->src_height);
}
break;
case 3: // keep all image size and create need size
if($ratio_w > 1 && $ratio_h > 1) {
$dst_x = (int)(abs($dst_width - $this->src_width )/2) ;
$dst_y = (int)(abs($dst_height- $this->src_height)/2) ;
imagecopy($this->dImage, $this->sImage, $dst_x,$dst_y,0,0,$this->src_width,$this->src_height);
} else {
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
$dst_x = (int)(abs($tmp_w -$dst_width )/2) ;
$dst_y = (int)(abs($tmp_h -$dst_height)/2) ;
imagecopy($this->dImage, $tmp_img, $dst_x,$dst_y,0,0,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
}
break;
case 4: // keep all image but create actually size
if($ratio_w > 1 && $ratio_h > 1) {
$this->dImage = imagecreatetruecolor($this->src_width,$this->src_height);
imagecopy($this->dImage, $this->sImage,0,0,0,0,$this->src_width,$this->src_height);
} else {
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$this->dImage = imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($this->dImage,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
}
break;
}
}
// end Crop
}Run code
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