Use vertical variant of a char when it's in a missing vertical font (bug 1905623)

src/core/fonts.js

@@ -26,6 +26,7 @@ import {
 import { CFFCompiler, CFFParser } from "./cff_parser.js";
 import {
   FontFlags,
+  getVerticalPresentationForm,
   MacStandardGlyphOrdering,
   normalizeFontName,
   recoverGlyphName,
@@ -3366,6 +3367,13 @@ class Font {
       }
     }
 
+    if (this.missingFile && this.vertical && fontChar.length === 1) {
+      const vertical = getVerticalPresentationForm()[fontChar.charCodeAt(0)];
+      if (vertical) {
+        fontChar = unicode = String.fromCharCode(vertical);
+      }
+    }
+
     glyph = new Glyph(
       charcode,
       fontChar,

src/core/fonts_utils.js

@@ -15,6 +15,7 @@
 
 import { getEncoding, StandardEncoding } from "./encodings.js";
 import { getGlyphsUnicode } from "./glyphlist.js";
+import { getLookupTableFactory } from "./core_utils.js";
 import { getUnicodeForGlyph } from "./unicode.js";
 import { info } from "../shared/util.js";
 
@@ -168,8 +169,47 @@ function normalizeFontName(name) {
   return name.replaceAll(/[,_]/g, "-").replaceAll(/\s/g, "");
 }
 
+const getVerticalPresentationForm = getLookupTableFactory(t => {
+  // This table has been found at
+  // https://searchfox.org/mozilla-central/rev/cbdfa503a87597b20719aae5f6a1efccd6cb3b7b/gfx/thebes/gfxHarfBuzzShaper.cpp#251-294
+  t[0x2013] = 0xfe32; // EN DASH
+  t[0x2014] = 0xfe31; // EM DASH
+  t[0x2025] = 0xfe30; // TWO DOT LEADER
+  t[0x2026] = 0xfe19; // HORIZONTAL ELLIPSIS
+  t[0x3001] = 0xfe11; // IDEOGRAPHIC COMMA
+  t[0x3002] = 0xfe12; // IDEOGRAPHIC FULL STOP
+  t[0x3008] = 0xfe3f; // LEFT ANGLE BRACKET
+  t[0x3009] = 0xfe40; // RIGHT ANGLE BRACKET
+  t[0x300a] = 0xfe3d; // LEFT DOUBLE ANGLE BRACKET
+  t[0x300b] = 0xfe3e; // RIGHT DOUBLE ANGLE BRACKET
+  t[0x300c] = 0xfe41; // LEFT CORNER BRACKET
+  t[0x300d] = 0xfe42; // RIGHT CORNER BRACKET
+  t[0x300e] = 0xfe43; // LEFT WHITE CORNER BRACKET
+  t[0x300f] = 0xfe44; // RIGHT WHITE CORNER BRACKET
+  t[0x3010] = 0xfe3b; // LEFT BLACK LENTICULAR BRACKET
+  t[0x3011] = 0xfe3c; // RIGHT BLACK LENTICULAR BRACKET
+  t[0x3014] = 0xfe39; // LEFT TORTOISE SHELL BRACKET
+  t[0x3015] = 0xfe3a; // RIGHT TORTOISE SHELL BRACKET
+  t[0x3016] = 0xfe17; // LEFT WHITE LENTICULAR BRACKET
+  t[0x3017] = 0xfe18; // RIGHT WHITE LENTICULAR BRACKET
+  t[0xfe4f] = 0xfe34; // WAVY LOW LINE
+  t[0xff01] = 0xfe15; // FULLWIDTH EXCLAMATION MARK
+  t[0xff08] = 0xfe35; // FULLWIDTH LEFT PARENTHESIS
+  t[0xff09] = 0xfe36; // FULLWIDTH RIGHT PARENTHESIS
+  t[0xff0c] = 0xfe10; // FULLWIDTH COMMA
+  t[0xff1a] = 0xfe13; // FULLWIDTH COLON
+  t[0xff1b] = 0xfe14; // FULLWIDTH SEMICOLON
+  t[0xff1f] = 0xfe16; // FULLWIDTH QUESTION MARK
+  t[0xff3b] = 0xfe47; // FULLWIDTH LEFT SQUARE BRACKET
+  t[0xff3d] = 0xfe48; // FULLWIDTH RIGHT SQUARE BRACKET
+  t[0xff3f] = 0xfe33; // FULLWIDTH LOW LINE
+  t[0xff5b] = 0xfe37; // FULLWIDTH LEFT CURLY BRACKET
+  t[0xff5d] = 0xfe38; // FULLWIDTH RIGHT CURLY BRACKET
+});
+
 export {
   FontFlags,
+  getVerticalPresentationForm,
   MacStandardGlyphOrdering,
   normalizeFontName,
   recoverGlyphName,