DEDECMS5.7实现缩略图不拉伸变形的方法

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functionImageResize($srcFile,$toW,$toH,$toFile="")
{
global$cfg_photo_type;
if($toFile=="")
{
$toFile=$srcFile;
}
$info="";
$srcInfo=GetImageSize($srcFile,$info);
switch($srcInfo[2])
{
case1:
if(!$cfg_photo_type['gif'])
{
returnfalse;
}
$im=imagecreatefromgif($srcFile);
break;
case2:
if(!$cfg_photo_type['jpeg'])
{
returnfalse;
}
$im=imagecreatefromjpeg($srcFile);
break;
case3:
if(!$cfg_photo_type['png'])
{
returnfalse;
}
$im=imagecreatefrompng($srcFile);
break;
case6:
if(!$cfg_photo_type['bmp'])
{
returnfalse;
}
$im=imagecreatefromwbmp($srcFile);
break;
}
$srcW=ImageSX($im);
$srcH=ImageSY($im);
if($srcW<=$toW&&$srcH<=$toH)
{
returntrue;
}
//缩略生成并裁剪
$newW=$toH*$srcW/$srcH;
$newH=$toW*$srcH/$srcW;
if($newH>=$toH)
{
$ftoW=$toW;
$ftoH=$newH;
}
else
{
$ftoW=$newW;
$ftoH=$toH;
}
if($srcW>$toW||$srcH>$toH)
{
if(function_exists("imagecreatetruecolor"))
{
@$ni=imagecreatetruecolor($ftoW,$ftoH);
if($ni)
{
imagecopyresampled($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH);
}
else
{
$ni=imagecreate($ftoW,$ftoH);
imagecopyresized($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH);
}
}
else
{
$ni=imagecreate($ftoW,$ftoH);
imagecopyresized($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH);
}
//裁剪图片成标准缩略图
$new_imgx=imagecreatetruecolor($toW,$toH);
if($newH>=$toH)
{
imagecopyresampled($new_imgx,$ni,0,0,0,($newH-$toH)/2,$toW,$toH,$toW,$toH);
}
else
{
imagecopyresampled($new_imgx,$ni,0,0,($newW-$toW)/2,0,$toW,$toH,$toW,$toH);
}
switch($srcInfo[2])
{
case1:
imagegif($new_imgx,$toFile);
break;
case2:
imagejpeg($new_imgx,$toFile,85);
break;
case3:
imagepng($new_imgx,$toFile);
break;
case6:
imagebmp($new_imgx,$toFile);
break;
default:
returnfalse;
}
imagedestroy($new_imgx);
imagedestroy($ni);
}
imagedestroy($im);
returntrue;
}