From 5fc04a060d67cf0930bb397fb114a74e93e94feb Mon Sep 17 00:00:00 2001
From: Lucas Wojciechowski <lucas@mapbox.com>
Date: Tue, 14 Jun 2016 14:10:35 -0700
Subject: [PATCH] Use linear interpolation for rotated icons

---
 js/data/bucket/symbol_bucket.js |  2 ++
 js/style/style_layer.js         | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/js/data/bucket/symbol_bucket.js b/js/data/bucket/symbol_bucket.js
index 0b31a53c9a3..b708184ac48 100644
--- a/js/data/bucket/symbol_bucket.js
+++ b/js/data/bucket/symbol_bucket.js
@@ -235,6 +235,8 @@ SymbolBucket.prototype.populateBuffers = function(collisionTile, stacks, icons)
                 }
                 if (image.pixelRatio !== 1) {
                     this.iconsNeedLinear = true;
+                } else if (layout['icon-rotate'] !== 0 || !this.layer.isLayoutValueFeatureConstant('icon-rotate')) {
+                    this.iconsNeedLinear = true;
                 }
             }
         } else {
diff --git a/js/style/style_layer.js b/js/style/style_layer.js
index 404f16edd6c..95722527740 100644
--- a/js/style/style_layer.js
+++ b/js/style/style_layer.js
@@ -193,6 +193,16 @@ StyleLayer.prototype = util.inherit(Evented, {
         }
     },
 
+    isLayoutValueFeatureConstant: function(name) {
+        var declaration = this._layoutDeclarations[name];
+
+        if (declaration) {
+            return declaration.isFeatureConstant;
+        } else {
+            return true;
+        }
+    },
+
     isPaintValueZoomConstant: function(name) {
         var transition = this._paintTransitions[name];