/**
* clear the page's current background image
*
* @param array $args arguments
* key 'page' is the page (i.e. page.rev)
* @return array response
*/
function page_clear_background_img($args)
{
if (!isset($args['page'])) {
return response('Required argument "page" missing', 400);
}
if (!page_exists($args['page'])) {
return response('Page ' . quot($args['page']) . ' does not exist', 400);
}
load_modules('glue');
$obj = load_object(array('name' => $args['page'] . '.page'));
if ($obj['#error']) {
// page object does not exist, hence no background image to clear
return response(true);
} else {
$obj = $obj['#data'];
}
if (!empty($obj['page-background-file'])) {
// delete file
delete_upload(array('pagename' => array_shift(expl('.', $args['page'])), 'file' => $obj['page-background-file'], 'max_cnt' => 1));
// and remove attributes
return object_remove_attr(array('name' => $obj['name'], 'attr' => array('page-background-file', 'page-background-mime')));
} else {
return response(true);
}
}
/**
* resize an image object
*
* this function drops the reference to any currently resized version,
* saves the resized image together with the original image in the page's
* shared folder and updates the object file to use the resized version.
* @param array $args arguments
* key 'name' name of the objects
* key 'width' width in px
* key 'height' height in px
* @return array response
* true if the client is advised to reload the image, false if not
*/
function image_resize($args)
{
// check for gd
if (!_gd_available()) {
return response('Host does not have gd', 500);
}
// set requested width & height
if (($width = @intval($args['width'])) == 0) {
return response('Required argument "width" is zero or does not exist', 400);
}
if (($height = @intval($args['height'])) == 0) {
return response('Required argument "height" is zero or does not exist', 400);
}
load_modules('glue');
// resolve symlinks
$ret = object_get_symlink($args);
if ($ret['#error']) {
return $ret;
} elseif ($ret['#data'] !== false) {
log_msg('debug', 'image_resize: resolved object ' . quot($args['name']) . ' into ' . quot($ret['#data']));
$args['name'] = $ret['#data'];
}
// load object
$obj = load_object($args);
if ($obj['#error']) {
return $obj;
} else {
$obj = $obj['#data'];
}
if (@intval($obj['image-file-width']) == 0 || @intval($obj['image-file-height']) == 0) {
return response('Original dimensions are not available', 500);
}
// set pagename
$pn = array_shift(expl('.', $obj['name']));
// resizing might not be necessary at all
if (!empty($obj['image-resized-file']) && @intval($obj['image-resized-width']) == $width && @intval($obj['image-resized-height'] == $height)) {
log_msg('debug', 'image_resize: width and height match the current resized file, no resize necessary');
return response(false);
}
// else remove any currently resized file
if (!empty($obj['image-resized-file'])) {
log_msg('info', 'image_resize: dropping reference to previous resized file ' . quot($obj['image-resized-file']));
delete_upload(array('pagename' => $pn, 'file' => $obj['image-resized-file'], 'max_cnt' => 1));
unset($obj['image-resized-file']);
unset($obj['image-resized-width']);
unset($obj['image-resized-height']);
// update object file as well
$ret = object_remove_attr(array('name' => $obj['name'], 'attr' => array('image-resized-file', 'image-resized-width', 'image-resized-height')));
if ($ret['#error']) {
return $ret;
}
$was_resized = true;
} else {
$was_resized = false;
}
// check if width or height are larger than the original
if (@intval($obj['image-file-width']) <= $width || @intval($obj['image-file-height']) <= $height) {
log_msg('debug', 'image_resize: dimensions requested are larger or equal than the original file is, no resize necessary');
// the client need not reload the the image if we were using the
// original before
if (!$was_resized) {
return response(false);
} else {
return response(true);
}
}
// check if we really have a source image
if (empty($obj['image-file-mime']) && empty($obj['image-file'])) {
return response(false);
}
// TODO (later): make this a generic function
// load source file
$ext = filext($obj['image-file']);
$fn = CONTENT_DIR . '/' . $pn . '/shared/' . $obj['image-file'];
if ($obj['image-file-mime'] == 'image/jpeg' || in_array($ext, array('jpg', 'jpeg'))) {
$orig = @imagecreatefromjpeg($fn);
$dest_ext = 'jpg';
} elseif ($obj['image-file-mime'] == 'image/png' || $ext == 'png') {
$orig = @imagecreatefrompng($fn);
$dest_ext = 'png';
} elseif (is_ani($fn)) {
// animated images shall not be resized
log_msg('debug', 'image_resize: animated image, not resizing');
return response(true);
} elseif ($obj['image-file-mime'] == 'image/gif' || $ext == 'gif') {
$orig = @imagecreatefromgif($fn);
// save gifs as png
// TODO (later): check for animated gif (see php.net/manual/en/function.imagecreatefromgif.php)
$dest_ext = 'png';
} else {
return response('Unsupported source file format ' . quot($obj['image-file']), 500);
}
if ($orig === false) {
return response('Error loading source file ' . quot($obj['image-file']), 500);
}
// get source file dimensions
$orig_size = @getimagesize($fn);
// create resized image
if (($resized = @imagecreatetruecolor($width, $height)) === false) {
@imagedestroy($orig);
return response('Error creating the resized image', 500);
}
// preserve any alpha channel
@imagealphablending($resized, false);
@imagesavealpha($resized, true);
// try to resize
if (!@imagecopyresampled($resized, $orig, 0, 0, 0, 0, $width, $height, $orig_size[0], $orig_size[1])) {
@imagedestroy($resized);
@imagedestroy($orig);
return response('Error resizing the source image', 500);
}
// setup destination filename
$a = expl('.', $obj['image-file']);
if (1 < count($a)) {
// throw the previous extension away
$fn = CONTENT_DIR . '/' . $pn . '/shared/' . implode('.', array_slice($a, 0, -1)) . '-' . $width . 'x' . $height . '.' . $dest_ext;
} else {
$fn = CONTENT_DIR . '/' . $pn . '/shared/' . $a[0] . '-' . $width . 'x' . $height . '.' . $dest_ext;
}
$m = umask(0111);
if ($dest_ext == 'jpg') {
$ret = @imagejpeg($resized, $fn, IMAGE_JPEG_QUAL);
} else {
if ($dest_ext == 'png') {
// preserve any alpha channel
@imagealphablending($resized, false);
@imagesavealpha($resized, true);
$ret = @imagepng($resized, $fn, IMAGE_PNG_QUAL);
}
}
umask($m);
// destroy images again
@imagedestroy($resized);
@imagedestroy($orig);
if (!$ret) {
return response('Error saving the resized image', 500);
} else {
log_msg('info', 'image_resize: created a resized image of ' . quot($obj['name']) . ' -> ' . quot(basename($fn)));
}
// the code above can take a while, so read in the object anew via
// update_object()
$update = array();
$update['name'] = $obj['name'];
$update['image-resized-file'] = basename($fn);
$update['image-resized-width'] = $width;
$update['image-resized-height'] = $height;
// we change width and height here as well since we are racing with the
// save_object from the frontend after resize
$update['object-width'] = $width . 'px';
$update['object-height'] = $height . 'px';
return update_object($update);
}
