Merge pull request #2987 from kartverket/2966

Image layer renderers use source projection if given and equivalent

src/ol/renderer/canvas/canvasimagelayerrenderer.js

@@ -9,6 +9,7 @@ goog.require('ol.ImageState');
 goog.require('ol.ViewHint');
 goog.require('ol.extent');
 goog.require('ol.layer.Image');
+goog.require('ol.proj');
 goog.require('ol.renderer.Map');
 goog.require('ol.renderer.canvas.Layer');
 goog.require('ol.vec.Mat4');
@@ -108,8 +109,14 @@ ol.renderer.canvas.ImageLayer.prototype.prepareFrame =
 
   if (!hints[ol.ViewHint.ANIMATING] && !hints[ol.ViewHint.INTERACTING] &&
       !ol.extent.isEmpty(renderedExtent)) {
+    var projection = viewState.projection;
+    var sourceProjection = imageSource.getProjection();
+    if (!goog.isNull(sourceProjection)) {
+      goog.asserts.assert(ol.proj.equivalent(projection, sourceProjection));
+      projection = sourceProjection;
+    }
     image = imageSource.getImage(
-        renderedExtent, viewResolution, pixelRatio, viewState.projection);
+        renderedExtent, viewResolution, pixelRatio, projection);
     if (!goog.isNull(image)) {
       var imageState = image.getState();
       if (imageState == ol.ImageState.IDLE) {