From da772fca8ccb79a69a4b8596e0a0c621002174e7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Malte=20Hu=CC=88bner?= <maltehuebner@gmx.org>
Date: Sat, 17 Feb 2018 01:51:25 +0100
Subject: [PATCH] Add type hint to canvas interface.

---
 src/Canvas/CanvasInterface.php | 4 +++-
 src/MapCache/MapCache.php      | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Canvas/CanvasInterface.php b/src/Canvas/CanvasInterface.php
index 9af8db9..57c86f3 100644
--- a/src/Canvas/CanvasInterface.php
+++ b/src/Canvas/CanvasInterface.php
@@ -2,9 +2,11 @@
 
 namespace StaticMapLite\Canvas;
 
+use Imagine\Image\ImageInterface;
+
 interface CanvasInterface
 {
-    public function getImage();
+    public function getImage(): ImageInterface;
     public function getWidth(): int;
     public function getHeight(): int;
     public function getCenterX(): float;
diff --git a/src/MapCache/MapCache.php b/src/MapCache/MapCache.php
index 87702b0..aa8cfd8 100644
--- a/src/MapCache/MapCache.php
+++ b/src/MapCache/MapCache.php
@@ -78,7 +78,8 @@ class MapCache
     public function cache(CanvasInterface $canvas): void
     {
         $this->mkdir_recursive(dirname($this->mapCacheIDToFilename()), 0777);
-        imagepng($canvas->getImage(), $this->mapCacheIDToFilename(), 9);
+
+        $canvas->getImage()->save($this->mapCacheIDToFilename());
 
         $output = new CacheOutput();
         $output->setFilename($this->mapCacheIDToFilename())