From d06d00ccbbab953fe08955dd2cf40c9378b14ed9 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Thu, 21 Feb 2019 01:29:15 +0100
Subject: [PATCH 1/2] Fix typo

---
 src/ol/source/Tile.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ol/source/Tile.js b/src/ol/source/Tile.js
index 9ea34b0ea7..76810a610f 100644
--- a/src/ol/source/Tile.js
+++ b/src/ol/source/Tile.js
@@ -75,7 +75,7 @@ class TileSource extends Source {
       if (tileGrid) {
         toSize(tileGrid.getTileSize(tileGrid.getMinZoom()), tileSize);
       }
-      const canUseScreen = 'screen ' in self;
+      const canUseScreen = 'screen' in self;
       const width = canUseScreen ? (screen.availWidth || screen.width) : 1920;
       const height = canUseScreen ? (screen.availHeight || screen.height) : 1080;
       cacheSize = 4 * Math.ceil(width / tileSize[0]) * Math.ceil(height / tileSize[1]);

From 4166c80c6eb339a1ca572dc7a7e2a17ee97d1bd4 Mon Sep 17 00:00:00 2001
From: ahocevar <andreas.hocevar@gmail.com>
Date: Thu, 21 Feb 2019 01:35:40 +0100
Subject: [PATCH 2/2] Test cache size

---
 test/spec/ol/source/tile.test.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/test/spec/ol/source/tile.test.js b/test/spec/ol/source/tile.test.js
index 4f408af41e..f92cb9106b 100644
--- a/test/spec/ol/source/tile.test.js
+++ b/test/spec/ol/source/tile.test.js
@@ -59,6 +59,10 @@ describe('ol.source.Tile', function() {
       expect(source).to.be.a(Source);
       expect(source).to.be.a(TileSource);
     });
+    it('sets a screen dependent cache size', function() {
+      const source = new TileSource({});
+      expect(source.tileCache.highWaterMark).to.be(4 * Math.ceil(screen.availWidth / 256) * Math.ceil(screen.availHeight / 256));
+    });
     it('sets a custom cache size', function() {
       const projection = getProjection('EPSG:4326');
       const source = new TileSource({