Merge pull request #901 from OpenGeoscience/quad-crop-issue

When tiles have overlap, rendering cropped tiles could throw an error.
OpenGeoscience · Aug 21, 2018 · 95c1e62 · 95c1e62
2 parents b3f521b + 3b2ca7d
commit 95c1e62
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/src/canvas/quadFeature.js b/src/canvas/quadFeature.js
@@ -174,8 +174,11 @@ var canvas_quadFeature = function (arg) {
         if (!quad.crop) {
           context2d.drawImage(src, 0, 0);
         } else {
-          context2d.drawImage(src, 0, 0, quad.crop.x, quad.crop.y, 0, 0,
-                              quad.crop.x, quad.crop.y);
+          var cropx = Math.min(src.w, quad.crop.x),
+              cropy = Math.min(src.h, quad.crop.y);
+          if (cropx > 0 && cropy > 0) {
+            context2d.drawImage(src, 0, 0, cropx, cropy, 0, 0, cropx, cropy);
+          }
         }
       });
     });