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Autodetect minzoom, maxzoom and format for mbtiles

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* `format` is detected via JPEG's magic number `FFD8`
* `minzoom` and `maxzoom` are `min(zoom_level)` and `max(zoom_level)`
This commit is contained in:
Fil 2014-06-20 23:15:01 +02:00
parent 8dec7469f1
commit 34ffddb765
1 changed files with 22 additions and 3 deletions
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25
tileserver.php
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@ -170,6 +170,25 @@ class Server {
$value = preg_replace('/(\\n)+/','',$r['value']);
$metadata[$r['name']] = addslashes($value);
}
if (!array_key_exists('minzoom', $metadata)
|| !array_key_exists('maxzoom', $metadata)
) {
// autodetect minzoom and maxzoom
$result = $this->db->query('select min(zoom_level) as min, max(zoom_level) as max from tiles');
$resultdata = $result->fetchAll();
if (!array_key_exists('minzoom', $metadata))
$metadata['minzoom'] = $resultdata[0]['min'];
if (!array_key_exists('maxzoom', $metadata))
$metadata['maxzoom'] = $resultdata[0]['max'];
}
// autodetect format using JPEG magic number FFD8
if (!array_key_exists('format', $metadata)) {
$result = $this->db->query('select hex(substr(tile_data,1,2)) as magic from tiles limit 1');
$resultdata = $result->fetchAll();
$metadata['format'] = ($resultdata[0]['magic'] == 'FFD8')
? 'jpg'
: 'png';
}
$metadata = $this->metadataValidation($metadata);
$mbt = explode('.', $mbt);
$metadata['basename'] = $mbt[0];
@ -191,8 +210,8 @@ class Server {
if (!array_key_exists('profile', $metadata)) {
$metadata['profile'] = 'mercator';
}
// TODO: detect format, minzoom, maxzoom, thumb
// scandir() for directory / SQL for mbtiles
// TODO: detect format, minzoom, maxzoom, thumb / scandir() for directory
// TODO: detect thumb / SQL for mbtiles
if (array_key_exists('minzoom', $metadata))
$metadata['minzoom'] = intval($metadata['minzoom']);
else
@ -205,7 +224,7 @@ class Server {
$metadata['format'] = 'png';
}
/*
if (!array_key_exists('thumb', $metadata )) {
if (!array_key_exists('profile', $metadata )) {
$metadata['profile'] = 'mercator';
}
*/