phpcms thumb函数生成等比缩略图时变形的解决方法

phpcms thumb函数生成缩略图时，如果生成的比例一样如1000*500的图生成100*50的图时会变形的解决方案：

如模板代码为：
<img src="{thumb($r[url],150,120,0)}" alt="{$r[alt]}" title="{$r[alt]}"/>


图片为960*768时，生成150*120时就会变形（这是我实际开发过程中用到的代码）


找到phpcms/libs/images.class.php中找到getpercent函数(大数在49行)，把此函数中的
$h = $dstw;
$w = $dsth;


改为
$h = $dsth;
$w = $dstw;


下面是改过后的整个函数，看代码注释

    function getpercent($srcwidth,$srcheight,$dstw,$dsth) {
            if (empty($srcwidth) || empty($srcheight) || ($srcwidth <= $dstW && $srcheight <= $dstH)) $w = $srcwidth ;$h = $srcheight;
            if ((empty($dstw) || $dstw == 0)  && $dsth > 0 && $srcheight > $dsth) {
                        $h = $dsth;
                        $w = round($dsth / $srcheight * $srcwidth);
                } elseif ((empty($dsth) || $dsth == 0) && $dstw > 0 && $srcwidth > $dstw) {
                        $w = $dstw;
                        $h = round($dstw / $srcwidth * $srcheight);
                } elseif ($dstw > 0 && $dsth > 0) {
                        if (($srcwidth / $dstw) < ($srcheight / $dsth)) {
                                        $w = round($dsth / $srcheight * $srcwidth);
                                        $h = $dsth;
                        } elseif (($srcwidth / $dstw) > ($srcheight / $dsth)) {
                                        $w = $dstw;
                                        $h = round($dstw / $srcwidth * $srcheight );
                        } else {
                            //第一步：把以下两行代码注释掉
                                //$h = $dstw;
                                //$w = $dsth;
                               
                                //第二步：改为以下两行代码
                                $h = $dsth;
                                $w = $dstw;
                               
                               
                        }
                }
                $array['w']  = $w;
                $array['h']  = $h;
                return $array;
    }