Set bold and italic properties to translated font

src/core/evaluator.js

@@ -4606,6 +4606,10 @@ class PartialEvaluator {
     if (typeof italicAngle !== "number") {
       italicAngle = 0;
     }
+    let fontWeight = descriptor.get("FontWeight");
+    if (typeof fontWeight !== "number") {
+      fontWeight = 400;
+    }
 
     const properties = {
       type,
@@ -4630,6 +4634,7 @@ class PartialEvaluator {
       capHeight,
       flags,
       italicAngle,
+      fontWeight,
       isType3Font,
       cssFontInfo,
       scaleFactors: glyphScaleFactors,

src/core/fonts.js

@@ -1042,6 +1042,16 @@ class Font {
     this.fontMatrix = properties.fontMatrix;
     this.bbox = properties.bbox;
     this.defaultEncoding = properties.defaultEncoding;
+    if (typeof properties.fontWeight === "number") {
+      if (properties.fontWeight === 900) {
+        this.black = true;
+      } else if (properties.fontWeight >= 700) {
+        this.bold = true;
+      }
+    }
+    if (typeof properties.italicAngle === "number" && properties.italicAngle) {
+      this.italic = true;
+    }
 
     this.toUnicode = properties.toUnicode;
     this.toFontChar = [];

test/pdfs/.gitignore

@@ -752,3 +752,4 @@
 !bug1937438_af_from_latex.pdf
 !bug1937438_from_word.pdf
 !bug1937438_mml_from_latex.pdf
+!translated_fonts_weight.pdf

test/unit/api_spec.js

@@ -3309,6 +3309,46 @@ describe("api", function () {
         await loadingTask.destroy();
       });
     });
+
+    describe("Fonts", function () {
+      it("set black/bold/italic properties to translated fonts", async function () {
+        const loadingTask = getDocument(
+          buildGetDocumentParams("translated_fonts_weight.pdf")
+        );
+        const pdfDoc = await loadingTask.promise;
+        const page = await pdfDoc.getPage(1);
+        await page.getOperatorList();
+
+        const fontsMap = Array.from(page.commonObjs);
+        const fonts = fontsMap.map(entry => entry[1]);
+
+        expect(fonts[0].black).toEqual(undefined);
+        expect(fonts[0].bold).toEqual(undefined);
+        expect(fonts[0].italic).toEqual(undefined);
+
+        expect(fonts[1].black).toEqual(undefined);
+        expect(fonts[1].bold).toEqual(true);
+        expect(fonts[1].italic).toEqual(undefined);
+
+        expect(fonts[2].black).toEqual(undefined);
+        expect(fonts[2].bold).toEqual(undefined);
+        expect(fonts[2].italic).toEqual(true);
+
+        expect(fonts[3].black).toEqual(undefined);
+        expect(fonts[3].bold).toEqual(true);
+        expect(fonts[3].italic).toEqual(true);
+
+        expect(fonts[4].black).toEqual(true);
+        expect(fonts[4].bold).toEqual(undefined);
+        expect(fonts[4].italic).toEqual(undefined);
+
+        expect(fonts[5].black).toEqual(true);
+        expect(fonts[5].bold).toEqual(undefined);
+        expect(fonts[5].italic).toEqual(true);
+
+        await loadingTask.destroy();
+      });
+    });
   });
 
   describe("Page", function () {