From 4040d03ae6ef8054671fda169d239e4dba810b12 Mon Sep 17 00:00:00 2001
From: philip <philip@bitsighttech.com>
Date: Sat, 28 Dec 2019 18:09:07 +0000
Subject: [PATCH] Fix problem with zero size canvas drawing

---
 src/ol/reproj.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/ol/reproj.js b/src/ol/reproj.js
index e669a4ec82..32ded4f1a5 100644
--- a/src/ol/reproj.js
+++ b/src/ol/reproj.js
@@ -135,12 +135,15 @@ export function render(width, height, pixelRatio,
     const srcWidth = getWidth(src.extent);
     const srcHeight = getHeight(src.extent);
 
-    stitchContext.drawImage(
-      src.image,
-      gutter, gutter,
-      src.image.width - 2 * gutter, src.image.height - 2 * gutter,
-      xPos * stitchScale, yPos * stitchScale,
-      srcWidth * stitchScale, srcHeight * stitchScale);
+    // This test should never fail -- but it does. Need to find a fix the upstream condition
+    if (src.image.width > 0 && src.image.height > 0) {
+      stitchContext.drawImage(
+        src.image,
+        gutter, gutter,
+        src.image.width - 2 * gutter, src.image.height - 2 * gutter,
+        xPos * stitchScale, yPos * stitchScale,
+        srcWidth * stitchScale, srcHeight * stitchScale);
+    }
   });
 
   const targetTopLeft = getTopLeft(targetExtent);