Drupal 7 Module Development

Working with Files and Images
*/
function twitpic_image_munge($id, $operation = 'rotate') {
// If we get a disallowed operation, just return.
$operations = array('rotate', 'desaturate', 'scale');
if (!in_array($operation, $operations)) {
return;
}
$twitpic_uri = 'twitpic://' . $id . '/thumb';
$local_uri = 'public://' . $id . '.jpg';
$twitpic_image = file_get_contents($twitpic_uri);
$local_path = file_unmanaged_save_data($twitpic_image,
uri, FILE_EXISTS_REPLACE);
$local_image = image_load($local_path);
$local_
switch ($operation) {
case 'scale':
image_scale($local_image, NULL, 50, FALSE);
break;
case 'desaturate':
image_desaturate($local_image);
break;
}
case 'rotate':
image_rotate($local_image, 45, 0x7D26CD);
break;
$local_uri = drupal_tempnam('public://', $id);
image_save($local_image, $local_uri);
}
return theme('image', array('path' => $local_uri));
The first thing we do is to define our allowed operations, and return if the
operation passed in doesn't match one of them. This allows us to fail gracefully in
that situation. Then we put together the Twitpic URI and grab a local copy of the
Twitpic image using file_get_contents() as we did earlier in the chapter. For the
purposes of this example, we just hardcode the size to thumb, but you could easily
add that as an additional argument, if you wish to do so.
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