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<?php
/**
* Watermarking functions
*
* @package TidypicsWatermark
*/
/**
* Make replacements in watermark text
*
* @param string $text
* @param ElggUser $owner
* @return string
*/
function tp_process_watermark_text($text, $owner) {
global $CONFIG;
$text = str_replace("%name%", $owner->name, $text);
$text = str_replace("%sitename%", $CONFIG->sitename, $text);
return $text;
}
/**
* Create the watermark image filename
*
* @param string $text
* @param ElggUser $owner
* @return string
*/
function tp_get_watermark_filename($text, $owner) {
$base = elgg_strtolower($text);
$base = preg_replace("/[^\w-]+/", "-", $base);
$base = trim($base, '-');
$filename = tp_get_img_dir();
$filename .= elgg_strtolower($owner->username . "_" . $base . "_stamp");
return $filename;
}
/**
* Use GD to apply watermark to image
*
* @param resource $image GD image resource
*/
function tp_gd_watermark($image) {
global $CONFIG;
$watermark_text = elgg_get_plugin_setting('watermark_text', 'tidypics');
if (!$watermark_text) {
return;
}
// plugins can do their own watermark and return false to prevent this function from running
if (trigger_plugin_hook('tp_watermark', 'gd', $image, true) === false) {
return;
}
$owner = elgg_get_logged_in_user_guid();
$watermark_text = tp_process_watermark_text($watermark_text, $owner);
// transparent gray
imagealphablending($image, true);
$textcolor = imagecolorallocatealpha($image, 50, 50, 50, 60);
// font and location
$font = $CONFIG->pluginspath . "tidypics/fonts/LiberationSerif-Regular.ttf";
$bbox = imagettfbbox(20, 0, $font, $watermark_text);
$text_width = $bbox[2] - $bbox[0];
$text_height = $bbox[1] - $bbox[7];
$image_width = imagesx($image);
$image_height = imagesy($image);
$left = $image_width / 2 - $text_width / 2;
$top = $image_height - 20;
// write the text on the image
imagettftext($image, 20, 0, $left, $top, $textcolor, $font, $watermark_text);
}
/**
* imagick watermarking
*
* @param string $filename
* @return bool
*/
function tp_imagick_watermark($filename) {
$watermark_text = elgg_get_plugin_setting('watermark_text', 'tidypics');
if (!$watermark_text) {
return false;
}
// plugins can do their own watermark and return false to prevent this function from running
if (elgg_trigger_plugin_hook('tp_watermark', 'imagick', $filename, true) === false) {
return true;
}
$owner = get_loggedin_user();
$watermark_text = tp_process_watermark_text($watermark_text, $owner);
$img = new Imagick($filename);
$img->readImage($image);
$draw = new ImagickDraw();
//$draw->setFont("");
$draw->setFontSize(28);
$draw->setFillOpacity(0.5);
$draw->setGravity(Imagick::GRAVITY_SOUTH);
$img->annotateImage($draw, 0, 0, 0, $watermark_text);
if ($img->writeImage($filename) != true) {
$img->destroy();
return false;
}
$img->destroy();
return true;
}
/**
* ImageMagick watermarking
*
* @param string $filename
*/
function tp_im_cmdline_watermark($filename) {
$watermark_text = elgg_get_plugin_setting('watermark_text', 'tidypics');
if (!$watermark_text) {
return;
}
// plugins can do their own watermark and return false to prevent this function from running
if (trigger_plugin_hook('tp_watermark', 'imagemagick', $filename, true) === false) {
return;
}
$im_path = elgg_get_plugin_setting('im_path', 'tidypics');
if (!$im_path) {
$im_path = "/usr/bin/";
}
// make sure end of path is /
if (substr($im_path, strlen($im_path)-1, 1) != "/") {
$im_path .= "/";
}
$owner = get_loggedin_user();
$watermark_text = tp_process_watermark_text($watermark_text, $owner);
$ext = ".png";
$user_stamp_base = tp_get_watermark_filename($watermark_text, $owner);
if ( !file_exists( $user_stamp_base . $ext )) {
//create the watermark image if it doesn't exist
$commands = array();
$commands[] = $im_path . 'convert -size 300x50 xc:grey30 -pointsize 20 -gravity center -draw "fill grey70 text 0,0 \''. $watermark_text . '\'" "'. $user_stamp_base . '_fgnd' . $ext . '"';
$commands[] = $im_path . 'convert -size 300x50 xc:black -pointsize 20 -gravity center -draw "fill white text 1,1 \''. $watermark_text . '\' text 0,0 \''. $watermark_text . '\' fill black text -1,-1 \''. $watermark_text . '\'" +matte ' . $user_stamp_base . '_mask' . $ext;
$commands[] = $im_path . 'composite -compose CopyOpacity "' . $user_stamp_base . "_mask" . $ext . '" "' . $user_stamp_base . '_fgnd' . $ext . '" "' . $user_stamp_base . $ext . '"';
$commands[] = $im_path . 'mogrify -trim +repage "' . $user_stamp_base . $ext . '"';
$commands[] = 'rm "' . $user_stamp_base . '_mask' . $ext . '"';
$commands[] = 'rm "' . $user_stamp_base . '_fgnd' . $ext . '"';
foreach( $commands as $command ) {
exec( $command );
}
}
//apply the watermark
$commands = array();
$commands[] = $im_path . 'composite -gravity south -geometry +0+10 "' . $user_stamp_base . $ext . '" "' . $filename . '" "' . $filename . '_watermarked"';
$commands[] = "mv \"$filename" . "_watermarked\" \"$filename\"";
foreach( $commands as $command ) {
exec( $command );
}
}
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