add support for image-filters-inflate - refs mapnik/mapnik#2165

lib/carto/tree/style.js

@@ -5,13 +5,16 @@ var _ = require('underscore');
 // return a stringified style for Mapnik
 tree.StyleXML = function(name, attachment, definitions, env) {
     var existing = {};
-    var image_filters = [], direct_image_filters = [], comp_op = [], opacity = [];
+    var image_filters = [], image_filters_inflate = [], direct_image_filters = [], comp_op = [], opacity = [];
 
     for (var i = 0; i < definitions.length; i++) {
         for (var j = 0; j < definitions[i].rules.length; j++) {
             if (definitions[i].rules[j].name === 'image-filters') {
                 image_filters.push(definitions[i].rules[j]);
             }
+            if (definitions[i].rules[j].name === 'image-filters-inflate') {
+                image_filters_inflate.push(definitions[i].rules[j]);
+            }
             if (definitions[i].rules[j].name === 'direct-image-filters') {
                 direct_image_filters.push(definitions[i].rules[j]);
             }
@@ -38,6 +41,10 @@ tree.StyleXML = function(name, attachment, definitions, env) {
         }).value().join(',') + '"';
     }
 
+    if (image_filters_inflate.length) {
+        attrs_xml += ' image-filters-inflate="' + image_filters_inflate[0].value.ev(env).toString() + '"';
+    }
+
     if (direct_image_filters.length) {
         attrs_xml += ' direct-image-filters="' + _.chain(direct_image_filters)
             // prevent identical filters from being duplicated in the style

test/rendering-mss/image-filters.mss

@@ -1,4 +1,5 @@
 #layer {
-	image-filters:invert();
-	direct-image-filters:invert();
+    image-filters:invert();
+    image-filters-inflate:true;
+    direct-image-filters:invert();
 }

test/rendering-mss/image-filters.xml

@@ -1,2 +1,2 @@
-<Style name="style" filter-mode="first" image-filters="invert" direct-image-filters="invert">
+<Style name="style" filter-mode="first" image-filters="invert" image-filters-inflate="true" direct-image-filters="invert">
 </Style>