From 78aea2631835ebcc29c91ddac5097f79c0f2a7d3 Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Thu, 25 Aug 2016 09:28:38 +0200
Subject: [PATCH] Allow @4x requests

---
 docs/endpoints.rst    | 2 +-
 src/serve_rendered.js | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/endpoints.rst b/docs/endpoints.rst
index a1373f4..f7bca27 100644
--- a/docs/endpoints.rst
+++ b/docs/endpoints.rst
@@ -15,7 +15,7 @@ Rendered tiles
 ==============
 * Rendered tiles are served at ``/styles/{id}/rendered/{z}/{x}/{y}[@2x].{format}``
 
-  * The optional ``@2x`` (or ``@3x``) part can be used to render HiDPI (retina) tiles
+  * The optional ``@2x`` (or ``@3x``, ``@4x``) part can be used to render HiDPI (retina) tiles
   * Available formats: ``png``, ``jpg`` (``jpeg``), ``webp``
   * TileJSON at ``/styles/{id}/rendered.json``
 
diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index f01d25c..4d542bd 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -24,7 +24,7 @@ var Canvas = require('canvas'),
 var utils = require('./utils');
 
 var FLOAT_PATTERN = '[+-]?(?:\\d+|\\d+\.?\\d+)';
-var SCALE_PATTERN = '@[23]x';
+var SCALE_PATTERN = '@[234]x';
 
 var getScale = function(scale) {
   return (scale || '@1x').slice(1, 2) | 0;
@@ -239,6 +239,7 @@ module.exports = function(options, repo, params, id, dataResolver) {
     map.renderers[1] = createPool(1, 4, 16);
     map.renderers[2] = createPool(2, 2, 8);
     map.renderers[3] = createPool(3, 2, 4);
+    map.renderers[4] = createPool(4, 2, 4);
   });
 
   repo[id] = tileJSON;