phpは画像に透かしを追加する機能を実現する
2986 ワード
/**
* （ png/jpg/gif ）
*
* @author flynetcn
*
* @param $srcImg
* @param $waterImg
* @param $savepath
* @param $savename
* @param $positon
* 1: , 2: , 3: , 4: , 5:
* @param $alpha -- 0: , 100:
*
* @return --
* -- -1: , -2: , -3:
* -4: -5:
*/
function img_water_mark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=30)
{
$temp = pathinfo($srcImg);
$name = $temp['basename'];
$path = $temp['dirname'];
$exte = $temp['extension'];
$savename = $savename ? $savename : $name;
$savepath = $savepath ? $savepath : $path;
$savefile = $savepath .'/'. $savename;
$srcinfo = @getimagesize($srcImg);
if (!$srcinfo) {
return -1; //
}
$waterinfo = @getimagesize($waterImg);
if (!$waterinfo) {
return -2; //
}
$srcImgObj = image_create_from_ext($srcImg);
if (!$srcImgObj) {
return -3; //
}
$waterImgObj = image_create_from_ext($waterImg);
if (!$waterImgObj) {
return -4; //
}
switch ($positon) {
//1
case 1: $x=$y=0; break;
//2
case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;
//3
case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break;
//4
case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break;
//5
case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break;
default: $x=$y=0;
}
imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);
switch ($srcinfo[2]) {
case 1: imagegif($srcImgObj, $savefile); break;
case 2: imagejpeg($srcImgObj, $savefile); break;
case 3: imagepng($srcImgObj, $savefile); break;
default: return -5; //
}
imagedestroy($srcImgObj);
imagedestroy($waterImgObj);
return $savefile;
}
function image_create_from_ext($imgfile)
{
$info = getimagesize($imgfile);
$im = null;
switch ($info[2]) {
case 1: $im=imagecreatefromgif($imgfile); break;
case 2: $im=imagecreatefromjpeg($imgfile); break;
case 3: $im=imagecreatefrompng($imgfile); break;
}
return $im;
}