From de60a0a07611cdd4d8e07d31a5a3477c6f9d64c1 Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Thu, 25 Aug 2016 10:23:42 +0200
Subject: [PATCH] Disable png quantization by default for now

---
 docs/config.rst       |  7 +++++--
 src/serve_rendered.js | 10 +++++++---
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/docs/config.rst b/docs/config.rst
index b123051..535353d 100644
--- a/docs/config.rst
+++ b/docs/config.rst
@@ -20,9 +20,10 @@ Example::
         "127.0.0.1:8080"
       ],
       "formatQuality": {
-        "png": 90,
         "jpeg": 80,
-        "webp": 90
+        "webp": 90,
+        "pngQuantization": false,
+        "png": 90
       },
       "maxSize": 2048
     },
@@ -70,6 +71,8 @@ You can use this to optionally specify on what domains the rendered tiles are ac
 
 Quality of the compression of individual image formats. [0-100]
 
+The value for ``png`` is only used when ``pngQuantization`` is ``true``.
+
 ``maxSize``
 -----------
 
diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index b5e7da4..832c303 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -317,9 +317,13 @@ module.exports = function(options, repo, params, id, dataResolver) {
           }
 
           if (format == 'png') {
-            buffer = pngquant.compress(buffer, {
-              quality: [0, formatQuality || 90]
-            });
+            var usePngQuant =
+                (options.formatQuality || {}).pngQuantization === true;
+            if (usePngQuant) {
+              buffer = pngquant.compress(buffer, {
+                quality: [0, formatQuality || 90]
+              });
+            }
           }
 
           res.set({