function try_switch_source(DerivativeParams $params, $original_mtime)
{
global $page;
if (!isset($page['original_size'])) {
return false;
}
$original_size = $page['original_size'];
if ($page['rotation_angle'] == 90 || $page['rotation_angle'] == 270) {
$tmp = $original_size[0];
$original_size[0] = $original_size[1];
$original_size[1] = $tmp;
}
$dsize = $params->compute_final_size($original_size);
$use_watermark = $params->use_watermark;
if ($use_watermark) {
$use_watermark = $params->will_watermark($dsize);
}
$candidates = array();
foreach (ImageStdParams::get_defined_type_map() as $candidate) {
if ($candidate->type == $params->type) {
continue;
}
if ($candidate->use_watermark != $use_watermark) {
continue;
}
if ($candidate->max_width() < $params->max_width() || $candidate->max_height() < $params->max_height()) {
continue;
}
$candidate_size = $candidate->compute_final_size($original_size);
if ($dsize != $params->compute_final_size($candidate_size)) {
continue;
}
if ($params->sizing->max_crop == 0) {
if ($candidate->sizing->max_crop != 0) {
continue;
}
} else {
if ($use_watermark && $candidate->use_watermark) {
continue;
}
//a square that requires watermark should not be generated from a larger derivative with watermark, because if the watermark is not centered on the large image, it will be cropped.
if ($candidate->sizing->max_crop != 0) {
continue;
}
// this could be optimized
if ($candidate_size[0] < $params->sizing->min_size[0] || $candidate_size[1] < $params->sizing->min_size[1]) {
continue;
}
}
$candidates[] = $candidate;
}
foreach (array_reverse($candidates) as $candidate) {
$candidate_path = $page['derivative_path'];
$candidate_path = str_replace('-' . derivative_to_url($params->type), '-' . derivative_to_url($candidate->type), $candidate_path);
$candidate_mtime = @filemtime($candidate_path);
if ($candidate_mtime === false || $candidate_mtime < $original_mtime || $candidate_mtime < $candidate->last_mod_time) {
continue;
}
$params->use_watermark = false;
$params->sharpen = min(1, $params->sharpen);
$page['src_path'] = $candidate_path;
$page['src_url'] = $page['root_path'] . substr($candidate_path, strlen(PHPWG_ROOT_PATH));
$page['rotation_angle'] = 0;
return true;
}
return false;
}
/**
* Deletes derivatives of a particular element
*
* @param array $infos ('path'[, 'representative_ext'])
* @param 'all'|int $type
*/
function delete_element_derivatives($infos, $type = 'all')
{
$path = $infos['path'];
if (!empty($infos['representative_ext'])) {
$path = original_to_representative($path, $infos['representative_ext']);
}
if (substr_compare($path, '../', 0, 3) == 0) {
$path = substr($path, 3);
}
$dot = strrpos($path, '.');
if ($type == 'all') {
$pattern = '-*';
} else {
$pattern = '-' . derivative_to_url($type) . '*';
}
$path = substr_replace($path, $pattern, $dot, 0);
if (($glob = glob(PHPWG_ROOT_PATH . PWG_DERIVATIVE_DIR . $path)) !== false) {
foreach ($glob as $file) {
@unlink($file);
}
}
}