dedecms缩略图按大小比例缩小裁剪

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修改如下： 打开/includes/helpers/image.helper.php文件

//缩图片自动生成函数，来源支持bmp、gif、jpg、png

//但生成的小图只用jpg或png格式

找到代码 function ImageResize

至

//获得GD的版本之间的代码

用如下的代码覆盖（大家请注意备份）。

function ImageResize($srcFile,$toW,$toH,$toFile="") 
{ 
global $cfg_photo_type; 
if($toFile=="") 
{ 
$toFile = $srcFile; 
} 
$info = ""; 
$srcInfo = GetImageSize($srcFile,$info); 
switch ($srcInfo[2]) 
{ 
case 1: 
if(!$cfg_photo_type['gif']) 
{ 
return false; 
} 
$im = imagecreatefromgif($srcFile); 
break; 
case 2: 
if(!$cfg_photo_type['jpeg']) 
{ 
return false; 
} 
$im = imagecreatefromjpeg($srcFile); 
break; 
case 3: 
if(!$cfg_photo_type['png']) 
{ 
return false; 
} 
$im = imagecreatefrompng($srcFile); 
break; 
case 6: 
if(!$cfg_photo_type['bmp']) 
{ 
return false; 
} 
$im = imagecreatefromwbmp($srcFile); 
break; 
} 
$srcW=ImageSX($im); 
$srcH=ImageSY($im); 
if($srcW<=$toW && $srcH<=$toH ) 
{ 
return true; 
} 
//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]) 
{ 
case 1: 
imagegif($new_imgx,$toFile); 
break; 
case 2: 
imagejpeg($new_imgx,$toFile,85); 
break; 
case 3: 
imagepng($new_imgx,$toFile); 
break; 
case 6: 
imagebmp($new_imgx,$toFile); 
break; 
default: 
return false; 
} 
imagedestroy($new_imgx); 
imagedestroy($ni); 
} 
imagedestroy($im); 
return true; 
}