From 2821c8f67bd3b5a4ec5f9335f9972b53917b7c59 Mon Sep 17 00:00:00 2001
From: Antoine Vandecreme <ant.vand@gmail.com>
Date: Thu, 6 Oct 2016 22:18:32 +0200
Subject: [PATCH] Partialy fix edge smoothing.

---
 src/drawer.js     |  7 ++++---
 src/tiledimage.js |  2 +-
 src/world.js      | 10 ++++++++++
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/src/drawer.js b/src/drawer.js
index a77edd56..7029320d 100644
--- a/src/drawer.js
+++ b/src/drawer.js
@@ -323,13 +323,13 @@ $.Drawer.prototype = {
                 this.sketchCanvas.height = sketchCanvasSize.y;
                 this.sketchContext = this.sketchCanvas.getContext( "2d" );
 
+                // FIXME: should check if any tiled image get rotated as well.
                 // If the viewport is not currently rotated, the sketchCanvas
                 // will have the same size as the main canvas. However, if
                 // the viewport get rotated later on, we will need to resize it.
                 if (this.viewport.getRotation() === 0) {
                     var self = this;
-                    this.viewer.addHandler('rotate', function resizeSketchCanvas() {
-                        self.viewer.removeHandler('rotate', resizeSketchCanvas);
+                    this.viewer.addOnceHandler('rotate', function resizeSketchCanvas() {
                         var sketchCanvasSize = self._calculateSketchCanvasSize();
                         self.sketchCanvas.width = sketchCanvasSize.x;
                         self.sketchCanvas.height = sketchCanvasSize.y;
@@ -617,7 +617,8 @@ $.Drawer.prototype = {
     // private
     _calculateSketchCanvasSize: function() {
         var canvasSize = this._calculateCanvasSize();
-        if (this.viewport.getRotation() === 0) {
+        if (this.viewport.getRotation() === 0 &&
+            !this.viewer.world._hasRotatedItem()) {
             return canvasSize;
         }
         // If the viewport is rotated, we need a larger sketch canvas in order
diff --git a/src/tiledimage.js b/src/tiledimage.js
index 15ec6668..90c9222a 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -1670,7 +1670,7 @@ function drawTiles( tiledImage, lastDrawn ) {
                     tiledImage._degrees,
                     tiledImage.viewport.pixelFromPointNoRotate(
                         tiledImage._getRotationPoint(true), true),
-                    useSketch);
+                    false);
             }
         }
         tiledImage._drawer.blendSketch({
diff --git a/src/world.js b/src/world.js
index e68590b3..ad6285d9 100644
--- a/src/world.js
+++ b/src/world.js
@@ -436,6 +436,16 @@ $.extend( $.World.prototype, $.EventSource.prototype, /** @lends OpenSeadragon.W
          * @property {?Object} userData - Arbitrary subscriber-defined object.
          */
         this.raiseEvent( 'remove-item', { item: item } );
+    },
+
+    // private
+    _hasRotatedItem: function() {
+        for (var i = 0; i < this._items.length; i++) {
+            if (this._items[i].getRotation() !== 0) {
+                return true;
+            }
+        }
+        return false;
     }
 });