Add ol.ENABLE_IMAGE to control inclusion of image layer renderers

src/ol/browserfeature.js

@@ -23,6 +23,12 @@ ol.ENABLE_CANVAS = true;
 ol.ENABLE_DOM = true;
 
 
+/**
+ * @define {boolean} Whether to enable rendering of image layers.
+ */
+ol.ENABLE_IMAGE = true;
+
+
 /**
  * @define {boolean} Whether to enable WebGL.
  */

src/ol/renderer/canvas/canvasmaprenderer.js

@@ -72,7 +72,7 @@ goog.inherits(ol.renderer.canvas.Map, ol.renderer.Map);
  * @inheritDoc
  */
 ol.renderer.canvas.Map.prototype.createLayerRenderer = function(layer) {
-  if (layer instanceof ol.layer.Image) {
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
     return new ol.renderer.canvas.ImageLayer(this, layer);
   } else if (layer instanceof ol.layer.Tile) {
     return new ol.renderer.canvas.TileLayer(this, layer);

src/ol/renderer/dom/dommaprenderer.js

@@ -53,7 +53,7 @@ goog.inherits(ol.renderer.dom.Map, ol.renderer.Map);
  */
 ol.renderer.dom.Map.prototype.createLayerRenderer = function(layer) {
   var layerRenderer;
-  if (layer instanceof ol.layer.Image) {
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
     layerRenderer = new ol.renderer.dom.ImageLayer(this, layer);
   } else if (layer instanceof ol.layer.Tile) {
     layerRenderer = new ol.renderer.dom.TileLayer(this, layer);

src/ol/renderer/webgl/webglmaprenderer.js

@@ -258,7 +258,7 @@ ol.renderer.webgl.Map.prototype.bindTileTexture =
  * @inheritDoc
  */
 ol.renderer.webgl.Map.prototype.createLayerRenderer = function(layer) {
-  if (layer instanceof ol.layer.Image) {
+  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
     return new ol.renderer.webgl.ImageLayer(this, layer);
   } else if (layer instanceof ol.layer.Tile) {
     return new ol.renderer.webgl.TileLayer(this, layer);