remove forced transparency from images in drawercomparison demo. change from context2d naming to canvas.

Gruntfile.js

@@ -59,7 +59,7 @@ module.exports = function(grunt) {
             "src/overlay.js",
             "src/drawerbase.js",
             "src/htmldrawer.js",
-            "src/context2ddrawer.js",
+            "src/canvasdrawer.js",
             "src/webgldrawer.js",
             "src/viewport.js",
             "src/tiledimage.js",

src/canvasdrawer.js

@@ -35,9 +35,9 @@
 (function( $ ){
 
 /**
- * @class Context2dDrawer
+ * @class CanvasDrawer
  * @memberof OpenSeadragon
- * @classdesc Default implementation of Context2dDrawer for an {@link OpenSeadragon.Viewer}.
+ * @classdesc Default implementation of CanvasDrawer for an {@link OpenSeadragon.Viewer}.
  * @param {Object} options - Options for this Drawer.
  * @param {OpenSeadragon.Viewer} options.viewer - The Viewer that owns this Drawer.
  * @param {OpenSeadragon.Viewport} options.viewport - Reference to Viewer viewport.
@@ -45,7 +45,7 @@
  * @param {Number} [options.debugGridColor] - See debugGridColor in {@link OpenSeadragon.Options} for details.
  */
 
-class Context2dDrawer extends $.DrawerBase{
+class CanvasDrawer extends $.DrawerBase{
     constructor(){
         super(...arguments);
 
@@ -1014,7 +1014,7 @@ class Context2dDrawer extends $.DrawerBase{
         };
     }
 }
-$.Context2dDrawer = Context2dDrawer;
+$.CanvasDrawer = CanvasDrawer;
 
 
 /**

src/openseadragon.js

@@ -1353,7 +1353,7 @@ function OpenSeadragon( options ){
                  * @property {Object} webgl - options if the WebGLDrawer is used.
                  * Set 'continuousTileFresh: true' if tile data is modified programmatically
                  * by filtering plugins or similar.
-                 * @property {Object} context2d - options if the Context2dDrawer is used
+                 * @property {Object} context2d - options if the CanvasDrawer is used
                  * @property {Object} html - options if the HTMLDrawer is used
                  * @property {Object} custom - options if a custom drawer is used
                  */

src/viewer.js

@@ -461,7 +461,7 @@ $.Viewer = function( options ) {
         let optsKey = null;
         // replace text-based option with appropriate constructor
         if (Drawer === 'canvas'){
-            Drawer = $.Context2dDrawer;
+            Drawer = $.CanvasDrawer;
             optsKey = 'canvas';
         } else if (Drawer === 'html'){
             Drawer = $.HTMLDrawer;

test/demo/drawercomparison.js

@@ -14,7 +14,7 @@ const labels = {
     duomo: 'Duomo',
 }
 
-//Double viewer setup for comparison - Context2dDrawer and WebGLDrawer
+//Double viewer setup for comparison - CanvasDrawer and WebGLDrawer
 // viewer1: canvas drawer
 let viewer1 = window.viewer1 = OpenSeadragon({
     id: "canvasdrawer",
@@ -281,7 +281,7 @@ function addTileSource(viewer, image, checkbox){
             let item = ev.item;
             let field = viewer === viewer1 ? 'item1' : 'item2';
             $(checkbox).data(field,item);
-            item.source.hasTransparency = ()=>true; //simulate image with transparency, to show seams in default renderer
+            // item.source.hasTransparency = ()=>true; //simulate image with transparency, to show seams in default renderer
         });
     }
 }