<?php
function watermark($sourcefile, $watermarkfile, $saveFile)
{
#
# $sourcefile = Filename of the picture to be watermarked.
# $watermarkfile = Filename of the 24-bit PNG watermark file.
#
//Get the resource ids of the pictures
$watermarkfile_id = imagecreatefrompng($watermarkfile);
imageAlphaBlending($watermarkfile_id, false);
imageSaveAlpha($watermarkfile_id, true);
$fileType = strtolower(substr($sourcefile, strlen($sourcefile)-
);
switch($fileType)
{
case('gif'):
$sourcefile_id = imagecreatefromgif($sourcefile);
break;
case('png'):
$sourcefile_id = imagecreatefrompng($sourcefile);
break;
default:
$sourcefile_id = imagecreatefromjpeg($sourcefile);
}
//Get the sizes of both pix
$sourcefile_width=imageSX($sourcefile_id);
$sourcefile_height=imageSY($sourcefile_id);
$watermarkfile_width=imageSX($watermarkfile_id);
$watermarkfile_height=imageSY($watermarkfile_id);
if(isset($_REQUEST['imgPhoto_x']))
{
$dest_x = $_REQUEST['imgPhoto_x'];
$dest_y = $_REQUEST['imgPhoto_y'];
}
else
{
$dest_x = ( $sourcefile_width / 2 ) - ( $watermarkfile_width / 2 );
$dest_y = ( $sourcefile_height / 2 ) - ( $watermarkfile_height / 2 );
}
// if a gif, we have to upsample it to a truecolor image
if($fileType == 'gif')
{
// create an empty truecolor container
$tempimage = imagecreatetruecolor($sourcefile_width,$sourcefile_height);
// copy the 8-bit gif into the truecolor image
imagecopy($tempimage, $sourcefile_id, 0, 0, 0, 0,$sourcefile_width, $sourcefile_height);
// copy the source_id int
$sourcefile_id = $tempimage;
}
imagecopy($sourcefile_id, $watermarkfile_id, $dest_x, $dest_y, 0, 0,$watermarkfile_width, $watermarkfile_height);
//Create a jpeg out of the modified picture
switch($fileType)
{
// remember we don't need gif any more, so we use only png or jpeg.
// See the upsaple code immediately above to see how we handle gifs
case('png'):
//header("Content-type: image/png");
imagepng ($sourcefile_id);
break;
default:
//header("Content-type: image/jpg");
if(imagejpeg ($sourcefile_id,$saveFile))
{
}
//echo "<img src='$saveFile'>";
}
imagedestroy($sourcefile_id);
imagedestroy($watermarkfile_id);
return true;
}
?>
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