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Index: src/infrastructure/celerity/CelerityResourceTransformer.php
===================================================================
--- src/infrastructure/celerity/CelerityResourceTransformer.php
+++ src/infrastructure/celerity/CelerityResourceTransformer.php
@@ -129,7 +129,14 @@
if ($this->celerityMap) {
$resource_uri = $this->celerityMap->getURIForName($alternative);
if ($resource_uri) {
- $uri = $resource_uri;
+ // Check if we can use a data URI for this resource. If not, just
+ // use a normal Celerity URI.
+ $data_uri = $this->generateDataURI($alternative);
+ if ($data_uri) {
+ $uri = $data_uri;
+ } else {
+ $uri = $resource_uri;
+ }
break;
}
}
@@ -226,4 +233,51 @@
return implode("\n\n", $rules);
}
+
+
+ /**
+ * Attempt to generate a data URI for a resource. We'll generate a data URI
+ * if the resource is a valid resource of an appropriate type, and is
+ * small enough. Otherwise, this method will return `null` and we'll end up
+ * using a normal URI instead.
+ *
+ * @param string Resource name to attempt to generate a data URI for.
+ * @return string|null Data URI, or null if we declined to generate one.
+ */
+ private function generateDataURI($resource_name) {
+
+ $ext = last(explode('.', $resource_name));
+ switch ($ext) {
+ case 'png':
+ $type = 'image/png';
+ break;
+ case 'gif':
+ $type = 'image/gif';
+ break;
+ case 'jpg':
+ $type = 'image/jpeg';
+ break;
+ default:
+ return null;
+ }
+
+ // In IE8, 32KB is the maximum supported URI length.
+ $maximum_data_size = (1024 * 32);
+
+ $data = $this->celerityMap->getResourceDataForName($resource_name);
+ if (strlen($data) >= $maximum_data_size) {
+ // If the data is already too large on its own, just bail before
+ // encoding it.
+ return null;
+ }
+
+ $uri = 'data:'.$type.';base64,'.base64_encode($data);
+ if (strlen($uri) >= $maximum_data_size) {
+ return null;
+ }
+
+ return $uri;
+ }
+
+
}

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