Added full UTF-8 support in Labels

CHANGES.md

@@ -268,6 +268,7 @@ _This is an npm-only release to fix a publishing issue_.
 * Added `computeLineSegmentLineSegmentIntersection` to `Intersections2D`. [#7228](https://github.com/AnalyticalGraphicsInc/Cesium/pull/7228)
 * Added ability to load availability progressively from a quantized mesh extension instead of upfront. This will speed up load time and reduce memory usage. [#7196](https://github.com/AnalyticalGraphicsInc/cesium/pull/7196)
 * Added the ability to apply styles to 3D Tilesets that don't contain features. [#7255](https://github.com/AnalyticalGraphicsInc/Cesium/pull/7255)
+* Added support for emojis in Labels.
 
 ##### Fixes :wrench:
 * Fixed issue causing polyline to look wavy depending on the position of the camera [#7209](https://github.com/AnalyticalGraphicsInc/cesium/pull/7209)

CONTRIBUTORS.md

@@ -237,3 +237,4 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute to Cesiu
 * [Qiming Zhang](https://github.com/bbbbx)
 * [Chris Wingler](https://github.com/chriswingler)
 * [Tinco Andringa](https://github.com/tinco)
+* [André Borud](https://github.com/andreborud)

LICENSE.md

@@ -971,3 +971,17 @@ https://github.com/logos
 ### Font Awesome Icon
 
 Font Awesome by Dave Gandy - http://fontawesome.io
+
+### GraphemeSplitter
+
+https://github.com/orling/grapheme-splitter
+
+> The MIT License (MIT)
+>
+> Copyright (c) 2015 Orlin Georgiev
+>
+> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Source/Scene/LabelCollection.js

@@ -18,6 +18,7 @@ import LabelStyle from './LabelStyle.js';
 import SDFSettings from './SDFSettings.js';
 import TextureAtlas from './TextureAtlas.js';
 import VerticalOrigin from './VerticalOrigin.js';
+import GraphemeSplitter from '../ThirdParty/graphemesplitter.js';
 
     // A glyph represents a single character in a particular label.  It may or may
     // not have a billboard, depending on whether the texture info has an index into
@@ -109,9 +110,12 @@ import VerticalOrigin from './VerticalOrigin.js';
         });
     }
 
+    var splitter = new GraphemeSplitter();
+
     function rebindAllGlyphs(labelCollection, label) {
         var text = label._renderedText;
-        var textLength = text.length;
+        var graphemes = splitter.splitGraphemes(text);
+        var textLength = graphemes.length;
         var glyphs = label._glyphs;
         var glyphsLength = glyphs.length;
 
@@ -173,7 +177,7 @@ import VerticalOrigin from './VerticalOrigin.js';
         // walk the text looking for new characters (creating new glyphs for each)
         // or changed characters (rebinding existing glyphs)
         for (textIndex = 0; textIndex < textLength; ++textIndex) {
-            var character = text.charAt(textIndex);
+            var character = graphemes[textIndex];
             var verticalOrigin = label._verticalOrigin;
 
             var id = JSON.stringify([