If image size is not provided, determine resolution on load

src/ol/image.js

@@ -7,6 +7,7 @@ goog.require('goog.events.EventType');
 goog.require('goog.object');
 goog.require('ol.ImageBase');
 goog.require('ol.ImageState');
+goog.require('ol.extent');
 
 
 
@@ -14,7 +15,7 @@ goog.require('ol.ImageState');
  * @constructor
  * @extends {ol.ImageBase}
  * @param {ol.Extent} extent Extent.
- * @param {number} resolution Resolution.
+ * @param {number|undefined} resolution Resolution.
  * @param {number} pixelRatio Pixel ratio.
  * @param {Array.<ol.Attribution>} attributions Attributions.
  * @param {string} src Image source URI.
@@ -103,6 +104,9 @@ ol.Image.prototype.handleImageError_ = function() {
  * @private
  */
 ol.Image.prototype.handleImageLoad_ = function() {
+  if (!goog.isDef(this.resolution)) {
+    this.resolution = ol.extent.getHeight(this.extent) / this.image_.height;
+  }
   this.state = ol.ImageState.LOADED;
   this.unlistenImage_();
   this.changed();

src/ol/imagebase.js

@@ -1,6 +1,7 @@
 goog.provide('ol.ImageBase');
 goog.provide('ol.ImageState');
 
+goog.require('goog.asserts');
 goog.require('goog.events.EventTarget');
 goog.require('goog.events.EventType');
 goog.require('ol.Attribution');
@@ -23,7 +24,7 @@ ol.ImageState = {
  * @constructor
  * @extends {goog.events.EventTarget}
  * @param {ol.Extent} extent Extent.
- * @param {number} resolution Resolution.
+ * @param {number|undefined} resolution Resolution.
  * @param {number} pixelRatio Pixel ratio.
  * @param {ol.ImageState} state State.
  * @param {Array.<ol.Attribution>} attributions Attributions.
@@ -39,10 +40,10 @@ ol.ImageBase = function(extent, resolution, pixelRatio, state, attributions) {
   this.attributions_ = attributions;
 
   /**
-   * @private
+   * @protected
    * @type {ol.Extent}
    */
-  this.extent_ = extent;
+  this.extent = extent;
 
   /**
    * @private
@@ -51,10 +52,10 @@ ol.ImageBase = function(extent, resolution, pixelRatio, state, attributions) {
   this.pixelRatio_ = pixelRatio;
 
   /**
-   * @private
+   * @protected
-   * @type {number}
+   * @type {number|undefined}
    */
-  this.resolution_ = resolution;
+  this.resolution = resolution;
 
   /**
    * @protected
@@ -86,7 +87,7 @@ ol.ImageBase.prototype.getAttributions = function() {
  * @return {ol.Extent} Extent.
  */
 ol.ImageBase.prototype.getExtent = function() {
-  return this.extent_;
+  return this.extent;
 };
 
 
@@ -109,7 +110,8 @@ ol.ImageBase.prototype.getPixelRatio = function() {
  * @return {number} Resolution.
  */
 ol.ImageBase.prototype.getResolution = function() {
-  return this.resolution_;
+  goog.asserts.assert(goog.isDef(this.resolution), 'resolution not yet set');
+  return this.resolution;
 };
 
 

src/ol/source/imagestaticsource.js

@@ -1,9 +1,13 @@
 goog.provide('ol.source.ImageStatic');
 
+goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('ol.Image');
+goog.require('ol.ImageState');
 goog.require('ol.extent');
 goog.require('ol.proj');
 goog.require('ol.source.Image');
+goog.require('ol.source.State');
 
 
 
@@ -21,27 +25,41 @@ ol.source.ImageStatic = function(options) {
 
   var attributions = goog.isDef(options.attributions) ?
       options.attributions : null;
+
+  var imageExtent = options.imageExtent;
+
+  var state, resolution, resolutions;
+  if (goog.isDef(options.imageSize)) {
+    state = ol.source.State.READY;
+    resolution = ol.extent.getHeight(imageExtent) / options.imageSize[1];
+    resolutions = [resolution];
+  } else {
+    state = ol.source.State.LOADING;
+  }
+
   var crossOrigin = goog.isDef(options.crossOrigin) ?
       options.crossOrigin : null;
-  var imageExtent = options.imageExtent;
-  var imageSize = options.imageSize;
-  var imageResolution = (imageExtent[3] - imageExtent[1]) / imageSize[1];
-  var imageUrl = options.url;
-  var projection = ol.proj.get(options.projection);
 
   goog.base(this, {
     attributions: attributions,
     logo: options.logo,
-    projection: projection,
+    projection: ol.proj.get(options.projection),
-    resolutions: [imageResolution]
+    resolutions: resolutions,
+    state: state
   });
 
   /**
    * @private
    * @type {ol.Image}
    */
-  this.image_ = new ol.Image(imageExtent, imageResolution, 1, attributions,
+  this.image_ = new ol.Image(imageExtent, resolution, 1, attributions,
-      imageUrl, crossOrigin);
+      options.url, crossOrigin);
+
+  if (state !== ol.source.State.READY) {
+    goog.events.listen(this.image_, goog.events.EventType.CHANGE,
+        this.handleImageChange_, false, this);
+    this.image_.load();
+  }
 
 };
 goog.inherits(ol.source.ImageStatic, ol.source.Image);
@@ -57,3 +75,17 @@ ol.source.ImageStatic.prototype.getImage =
   }
   return null;
 };
+
+
+/**
+ * Handle image change events.
+ * @private
+ */
+ol.source.ImageStatic.prototype.handleImageChange_ = function() {
+  var imageState = this.image_.getState();
+  if (imageState === ol.ImageState.LOADED) {
+    this.setState(ol.source.State.READY);
+  } else if (imageState === ol.ImageState.ERROR) {
+    this.setState(ol.source.State.ERROR);
+  }
+};