From 5a946893850b9e33999177bdb53f282117a0b008 Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Fri, 11 Mar 2016 16:40:05 +0100
Subject: [PATCH] Make compressionLevel/quality configurable + change defaults

---
 README.md           |  7 ++++++-
 src/serve_raster.js | 16 +++++++++++++---
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index d44b187..306cf55 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,12 @@ The config file can contain definition of several paths where the tiles will be
     "domains": [
       "localhost:8080",
       "127.0.0.1:8080"
-    ]
+    ],
+    "formatEncoding": {
+      "png": 6,
+      "jpeg": 80,
+      "webp": 90
+    }
   },
   "styles": {
     "test": {
diff --git a/src/serve_raster.js b/src/serve_raster.js
index a32fcb4..ead1f56 100644
--- a/src/serve_raster.js
+++ b/src/serve_raster.js
@@ -230,9 +230,19 @@ module.exports = function(options, repo, params, id) {
           image.resize(width * scale, height * scale);
         }
 
-        image.toFormat(format)
-          .compressionLevel(9)
-          .toBuffer(function(err, buffer, info) {
+        image.toFormat(format);
+
+        var formatEncoding = (params.formatEncoding || {})[format] ||
+                             (options.formatEncoding || {})[format];
+        if (format == 'png') {
+          image.compressionLevel(formatEncoding || 6)
+               .withoutAdaptiveFiltering();
+        } else if (format == 'jpeg') {
+          image.quality(formatEncoding || 80);
+        } else if (format == 'webp') {
+          image.quality(formatEncoding || 90);
+        }
+        image.toBuffer(function(err, buffer, info) {
           if (!buffer) {
             return res.status(404).send('Not found');
           }