Make sure 204 image requests reject when using ImageBitmap

CHANGES.md

@@ -10,11 +10,12 @@ Change Log
 ##### Fixes :wrench:
 * Fixed a bug that caused missing segments for ground polylines with coplanar points over large distances and problems with polylines containing duplicate points. [#7885](https://github.com/AnalyticalGraphicsInc/cesium//pull/7885)
 * Fixed a bug where billboards were not pickable when zoomed out completely in 2D View. [#7908](https://github.com/AnalyticalGraphicsInc/cesium/pull/7908)
+* Fixed a bug where image requests that returned HTTP code 204 would prevent any future request from succeeding on browsers that supported ImageBitmap. [#7914](https://github.com/AnalyticalGraphicsInc/cesium/pull/7914/)
 * Fixed polyline colors when `scene.highDynamicRange` is enabled. [#7924](https://github.com/AnalyticalGraphicsInc/cesium/pull/7924)
 * Fixed a bug in the inspector where the min/max height values of a picked tile were undefined. [#7904](https://github.com/AnalyticalGraphicsInc/cesium/pull/7904)
 
 ### 1.58.1 - 2018-06-03
-_This is an npm-only release to fix a publishing issue_
+_This is an npm-only release to fix a publishing issue_.
 
 ### 1.58 - 2019-06-03
 

Source/Core/Resource.js

@@ -981,7 +981,6 @@ define([
             }
 
             var deferred = when.defer();
-
             Resource._Implementations.createImage(url, crossOrigin, deferred, flipY, preferImageBitmap);
 
             return deferred.promise;
@@ -1869,24 +1868,18 @@ define([
 
                 return Resource.fetchBlob({
                     url: url
-                });
-            })
-            .then(function(blob) {
-                if (!defined(blob)) {
-                    return;
-                }
-
-                return Resource.createImageBitmapFromBlob(blob, {
-                    flipY: flipY,
-                    premultiplyAlpha: false
-                });
-            })
-            .then(function(imageBitmap) {
-                if (!defined(imageBitmap)) {
-                    return;
-                }
+                })
+                .then(function(blob) {
+                    if (!defined(blob)) {
+                        deferred.reject(new RuntimeError('Successfully retrieved ' + url + ' but it contained no content.'));
+                        return;
+                    }
 
-                deferred.resolve(imageBitmap);
+                    return Resource.createImageBitmapFromBlob(blob, {
+                        flipY: flipY,
+                        premultiplyAlpha: false
+                    });
+                }).then(deferred.resolve);
             })
             .otherwise(deferred.reject);
     };

Specs/Core/ResourceSpec.js

@@ -1891,6 +1891,37 @@ defineSuite([
                     expect(rejectedError).toBeInstanceOf(RequestErrorEvent);
                 });
 
+                it('is an image with status code 204 with preferImageBitmap', function() {
+                    if (!supportsImageBitmapOptions) {
+                        return;
+                    }
+
+                    var promise = Resource.fetchImage({
+                        url: './Data/Images/Green.png',
+                        preferImageBitmap: true
+                    });
+
+                    expect(promise).toBeDefined();
+
+                    var resolved = false;
+                    var resolvedValue;
+                    var rejectedError;
+                    promise.then(function(value) {
+                        resolved = true;
+                        resolvedValue = value;
+                    }).otherwise(function (error) {
+                        rejectedError = error;
+                    });
+
+                    expect(resolvedValue).toBeUndefined();
+                    expect(rejectedError).toBeUndefined();
+
+                    fakeXHR.simulateHttpResponse(204);
+                    expect(resolved).toBe(false);
+                    expect(resolvedValue).toBeUndefined();
+                    expect(rejectedError).toBeDefined();
+                });
+
                 it('resolves undefined for status code 204', function() {
                     var promise = loadWithXhr({
                         url : 'http://example.invalid'