Image layer renderers add attributions to frame state

src/ol/renderer/canvas/canvasimagelayerrenderer.js

@@ -94,6 +94,7 @@ ol.renderer.canvas.ImageLayer.prototype.renderFrame =
 
   if (!goog.isNull(this.image_)) {
     image = this.image_;
+
     var imageExtent = image.getExtent();
     var imageResolution = image.getResolution();
     var transform = this.transform_;
@@ -111,5 +112,7 @@ ol.renderer.canvas.ImageLayer.prototype.renderFrame =
         (imageExtent.minX - viewCenter.x) / imageResolution,
         (viewCenter.y - imageExtent.maxY) / imageResolution,
         0);
+
+    this.updateAttributions(frameState.attributions, image.getAttributions());
   }
 };

src/ol/renderer/dom/domimagelayerrenderer.js

@@ -106,6 +106,8 @@ ol.renderer.dom.ImageLayer.prototype.renderFrame =
       this.image_ = image;
     }
     this.setTransform(transform);
+
+    this.updateAttributions(frameState.attributions, image.getAttributions());
   }
 
 };

src/ol/renderer/layerrenderer.js

@@ -2,6 +2,7 @@ goog.provide('ol.renderer.Layer');
 
 goog.require('goog.events');
 goog.require('goog.events.EventType');
+goog.require('ol.Attribution');
 goog.require('ol.FrameState');
 goog.require('ol.Image');
 goog.require('ol.ImageState');
@@ -201,6 +202,23 @@ ol.renderer.Layer.prototype.scheduleExpireCache =
 };
 
 
+/**
+ * @protected
+ * @param {Object.<string, ol.Attribution>} attributionsSet Attributions
+ *     set (target).
+ * @param {Array.<ol.Attribution>} attributions Attributions (source).
+ */
+ol.renderer.Layer.prototype.updateAttributions =
+    function(attributionsSet, attributions) {
+  var i;
+  var attribution;
+  for (i = 0; i < attributions.length; ++i) {
+    attribution = attributions[i];
+    attributionsSet[goog.getUid(attribution).toString()] = attribution;
+  }
+};
+
+
 /**
  * @protected
  * @param {Object.<string, Object.<string, ol.TileRange>>} usedTiles Used tiles.

src/ol/renderer/webgl/webglimagelayerrenderer.js

@@ -198,6 +198,8 @@ ol.renderer.webgl.ImageLayer.prototype.renderFrame =
 
     this.image_ = image;
     this.texture_ = texture;
+
+    this.updateAttributions(frameState.attributions, image.getAttributions());
   }
 };