XFA - Support non-embedded fonts without a Widths entry

- some pdf use some fonts which are not embedded or they don't have any width array or don't have any css info (e.g. for standard fonts or Arial).
  - so add widths arrays for Liberation fonts in order to compute the ones for other fonts in using scale factors array.

src/core/xfa/factory.js

@@ -17,6 +17,7 @@ import { $globalData, $toHTML } from "./xfa_object.js";
 import { Binder } from "./bind.js";
 import { DataHandler } from "./data.js";
 import { FontFinder } from "./fonts.js";
+import { stripQuotes } from "./utils.js";
 import { warn } from "../../shared/util.js";
 import { XFAParser } from "./parser.js";
 
@@ -62,6 +63,24 @@ class XFAFactory {
 
   setFonts(fonts) {
     this.form[$globalData].fontFinder = new FontFinder(fonts);
+    const missingFonts = [];
+    for (let typeface of this.form[$globalData].usedTypefaces) {
+      typeface = stripQuotes(typeface);
+      const font = this.form[$globalData].fontFinder.find(typeface);
+      if (!font) {
+        missingFonts.push(typeface);
+      }
+    }
+
+    if (missingFonts.length > 0) {
+      return missingFonts;
+    }
+
+    return null;
+  }
+
+  appendFonts(fonts) {
+    this.form[$globalData].fontFinder.add(fonts);
   }
 
   getPages() {

src/core/xfa/fonts.js

@@ -21,53 +21,13 @@ class FontFinder {
     this.cache = new Map();
     this.warned = new Set();
     this.defaultFont = null;
+    this.add(pdfFonts);
+  }
+
+  add(pdfFonts) {
     for (const pdfFont of pdfFonts) {
-      const cssFontInfo = pdfFont.cssFontInfo;
-      const name = cssFontInfo.fontFamily;
-      let font = this.fonts.get(name);
-      if (!font) {
-        font = Object.create(null);
-        this.fonts.set(name, font);
-        if (!this.defaultFont) {
-          this.defaultFont = font;
-        }
-      }
-      let property = "";
-      if (cssFontInfo.italicAngle !== "0") {
-        if (parseFloat(cssFontInfo.fontWeight) >= 700) {
-          property = "bolditalic";
-        } else {
-          property = "italic";
-        }
-      } else if (parseFloat(cssFontInfo.fontWeight) >= 700) {
-        property = "bold";
-      }
-
-      if (!property) {
-        if (
-          pdfFont.name.includes("Bold") ||
-          (pdfFont.psName && pdfFont.psName.includes("Bold"))
-        ) {
-          property = "bold";
-        }
-        if (
-          pdfFont.name.includes("Italic") ||
-          pdfFont.name.endsWith("It") ||
-          (pdfFont.psName &&
-            (pdfFont.psName.includes("Italic") ||
-              pdfFont.psName.endsWith("It")))
-        ) {
-          property += "italic";
-        }
-      }
-
-      if (!property) {
-        property = "regular";
-      }
-
-      font[property] = pdfFont;
+      this.addPdfFont(pdfFont);
     }
-
     for (const pdfFont of this.fonts.values()) {
       if (!pdfFont.regular) {
         pdfFont.regular = pdfFont.italic || pdfFont.bold || pdfFont.bolditalic;
@@ -75,6 +35,52 @@ class FontFinder {
     }
   }
 
+  addPdfFont(pdfFont) {
+    const cssFontInfo = pdfFont.cssFontInfo;
+    const name = cssFontInfo.fontFamily;
+    let font = this.fonts.get(name);
+    if (!font) {
+      font = Object.create(null);
+      this.fonts.set(name, font);
+      if (!this.defaultFont) {
+        this.defaultFont = font;
+      }
+    }
+    let property = "";
+    if (cssFontInfo.italicAngle !== "0") {
+      if (parseFloat(cssFontInfo.fontWeight) >= 700) {
+        property = "bolditalic";
+      } else {
+        property = "italic";
+      }
+    } else if (parseFloat(cssFontInfo.fontWeight) >= 700) {
+      property = "bold";
+    }
+
+    if (!property) {
+      if (
+        pdfFont.name.includes("Bold") ||
+        (pdfFont.psName && pdfFont.psName.includes("Bold"))
+      ) {
+        property = "bold";
+      }
+      if (
+        pdfFont.name.includes("Italic") ||
+        pdfFont.name.endsWith("It") ||
+        (pdfFont.psName &&
+          (pdfFont.psName.includes("Italic") || pdfFont.psName.endsWith("It")))
+      ) {
+        property += "italic";
+      }
+    }
+
+    if (!property) {
+      property = "regular";
+    }
+
+    font[property] = pdfFont;
+  }
+
   getDefault() {
     return this.defaultFont;
   }

src/core/xfa/parser.js

@@ -34,7 +34,9 @@ class XFAParser extends XMLParserBase {
     super();
     this._builder = new Builder();
     this._stack = [];
-    this._globalData = Object.create(null);
+    this._globalData = {
+      usedTypefaces: new Set(),
+    };
     this._ids = new Map();
     this._current = this._builder.buildRoot(this._ids);
     this._errorCode = XMLParserErrorCode.NoError;

src/core/xfa/template.js

@@ -2665,6 +2665,11 @@ class Font extends XFAObject {
     this.fill = null;
   }
 
+  [$clean](builder) {
+    super[$clean](builder);
+    this[$globalData].usedTypefaces.add(this.typeface);
+  }
+
   [$toStyle]() {
     const style = toStyle(this, "fill");
     const color = style.color;

src/core/xfa/xhtml.js

@@ -16,6 +16,7 @@
 import {
   $acceptWhitespace,
   $childrenToHTML,
+  $clean,
   $content,
   $extra,
   $getChildren,
@@ -144,18 +145,23 @@ function mapStyle(styleStr, fontFinder) {
   return style;
 }
 
-function checkStyle(style) {
-  if (!style) {
+function checkStyle(node) {
+  if (!node.style) {
     return "";
   }
 
   // Remove any non-allowed keys.
-  return style
+  return node.style
     .trim()
     .split(/\s*;\s*/)
     .filter(s => !!s)
     .map(s => s.split(/\s*:\s*/, 2))
-    .filter(([key]) => VALID_STYLES.has(key))
+    .filter(([key, value]) => {
+      if (key === "font-family") {
+        node[$globalData].usedTypefaces.add(value);
+      }
+      return VALID_STYLES.has(key);
+    })
     .map(kv => kv.join(":"))
     .join(";");
 }
@@ -165,7 +171,12 @@ const NoWhites = new Set(["body", "html"]);
 class XhtmlObject extends XmlObject {
   constructor(attributes, name) {
     super(XHTML_NS_ID, name);
-    this.style = checkStyle(attributes.style);
+    this.style = attributes.style || "";
+  }
+
+  [$clean](builder) {
+    super[$clean](builder);
+    this.style = checkStyle(this);
   }
 
   [$acceptWhitespace]() {