Fix CBDT emoji font crash and COLR v1/composite glyph crashes

src/TTFFont.js

@@ -9,6 +9,7 @@ import TTFGlyph from './glyph/TTFGlyph';
 import CFFGlyph from './glyph/CFFGlyph';
 import SBIXGlyph from './glyph/SBIXGlyph';
 import COLRGlyph from './glyph/COLRGlyph';
+import CBDTGlyph from './glyph/CBDTGlyph';
 import GlyphVariationProcessor from './glyph/GlyphVariationProcessor';
 import TTFSubset from './subset/TTFSubset';
 import CFFSubset from './subset/CFFSubset';
@@ -414,6 +415,9 @@ export default class TTFFont {
       } else if ((this.directory.tables.COLR) && (this.directory.tables.CPAL)) {
         this._glyphs[glyph] = new COLRGlyph(glyph, characters, this);
 
+      } else if (this.directory.tables.CBLC || this.directory.tables.EBLC) {
+        this._glyphs[glyph] = new CBDTGlyph(glyph, characters, this);
+
       } else {
         this._getBaseGlyph(glyph, characters);
       }

src/glyph/CBDTGlyph.js

@@ -0,0 +1,25 @@
+import Glyph from './Glyph';
+import Path from './Path';
+
+/**
+ * Represents a bitmap glyph in the CBDT/CBLC format (e.g. color emoji).
+ * CBDT glyphs are bitmap-based and have no vector outlines.
+ * Metrics (advanceWidth etc.) come from hmtx via the base Glyph._getMetrics().
+ */
+export default class CBDTGlyph extends Glyph {
+  type = 'CBDT';
+
+  _getPath() {
+    // CBDT glyphs are bitmap-based, no vector outlines
+    return new Path();
+  }
+
+  _getCBox() {
+    return this.path.cbox;
+  }
+
+  _getBBox() {
+    return this.path.bbox;
+  }
+}
+

src/glyph/COLRGlyph.js

@@ -36,6 +36,14 @@ export default class COLRGlyph extends Glyph {
   get layers() {
     let cpal = this._font.CPAL;
     let colr = this._font.COLR;
+
+    // COLR v1 fonts (e.g. OpenMoji COLRv1) use paint-based records
+    // instead of v0 baseGlyphRecord. fontkit only supports v0, so
+    // return null to let callers fall back gracefully.
+    if (!colr || !colr.baseGlyphRecord) {
+      return null;
+    }
+
     let low = 0;
     let high = colr.baseGlyphRecord.length - 1;
 

src/glyph/TTFGlyph.js

@@ -273,7 +273,13 @@ export default class TTFGlyph extends Glyph {
     if (glyph.numberOfContours < 0) {
       // resolve composite glyphs
       for (let component of glyph.components) {
-        let contours = this._font.getGlyph(component.glyphID)._getContours();
+        // In COLR fonts, getGlyph() may return a COLRGlyph which doesn't
+        // have _getContours(). Use _getBaseGlyph() to get the TTF outline.
+        let componentGlyph = this._font._getBaseGlyph(component.glyphID) || this._font.getGlyph(component.glyphID);
+        if (!componentGlyph || typeof componentGlyph._getContours !== 'function') {
+          continue;
+        }
+        let contours = componentGlyph._getContours();
         for (let i = 0; i < contours.length; i++) {
           let contour = contours[i];
           for (let j = 0; j < contour.length; j++) {

test/data/NotoColorEmoji/OFL.txt

@@ -0,0 +1,92 @@
+This Font Software is licensed under the SIL Open Font License,
+Version 1.1.
+
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font
+creation efforts of academic and linguistic communities, and to
+provide a free and open framework in which fonts may be shared and
+improved in partnership with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply to
+any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software
+components as distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to,
+deleting, or substituting -- in part or in whole -- any of the
+components of the Original Version, by changing formats or by porting
+the Font Software to a new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed,
+modify, redistribute, and sell modified and unmodified copies of the
+Font Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components, in
+Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the
+corresponding Copyright Holder. This restriction only applies to the
+primary font name as presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created using
+the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

test/data/OpenMoji/LICENSE.txt

@@ -0,0 +1,13 @@
+OpenMoji
+https://openmoji.org/
+
+Copyright 2018-2024 OpenMoji project
+https://github.com/hfg-gmuend/openmoji
+
+OpenMoji graphics are licensed under the Creative Commons
+Attribution-ShareAlike License 4.0 (CC BY-SA 4.0)
+
+https://creativecommons.org/licenses/by-sa/4.0/
+
+Attribution: All emojis designed by OpenMoji – the open-source emoji
+and icon project. License: CC BY-SA 4.0

test/data/Twemoji/LICENSE.md

@@ -0,0 +1,39 @@
+## License for the Code
+
+Copyright 2016-2018, Mozilla Foundation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+
+
+## License for the Visual Design
+
+The Emoji art comes from [Twemoji](https://twitter.github.io/twemoji),
+and is used and redistributed under the CC-BY-4.0
+[license terms](https://github.com/twitter/twemoji#license)
+offered by the Twemoji project.
+
+### Creative Commons Attribution 4.0 International (CC BY 4.0)
+https://creativecommons.org/licenses/by/4.0/
+
+#### You are free to:
+**Share** — copy and redistribute the material in any medium or format
+
+**Adapt** — remix, transform, and build upon the material for any purpose, even commercially.
+
+#### Under the following terms:
+**Attribution** — You must give appropriate credit, provide a link to the license,
+and indicate if changes were made.
+
+**No additional restrictions** — You may not apply legal terms or technological measures
+that legally restrict others from doing anything the license permits.