Define font descriptor flags

pdf/model/font.go

@@ -468,6 +468,20 @@ func toUnicodeToCmap(toUnicode core.PdfObject, font *fontCommon) (*cmap.CMap, er
 	return cm, err
 }
 
+const (
+	fontFlagFixedPitch = 1 << iota
+	fontFlagSerif
+	fontFlagSymbolic
+	fontFlagScript
+	// Bit position 5 is not defined
+	fontFlagNonsymbolic = 1 << (iota + 1)
+	fontFlagItalic
+	// Bit position 8 - 16 are not defined
+	fontFlagAllCap = 1 << (iota + 10)
+	fontFlagSmallCap
+	fontFlagForceBold
+)
+
 // PdfFontDescriptor specifies metrics and other attributes of a font and can refer to a FontFile
 // for embedded fonts.
 // 9.8 Font Descriptors (page 281)

pdf/model/font_composite.go

@@ -578,16 +578,14 @@ func NewCompositePdfFontFromTTFFile(filePath string) (*PdfFont, error) {
 		descriptor.StemV = core.MakeInteger(70)
 	}
 
-	// Flags.
-	//flags := 1 << 5 // Non-Symbolic.
-	flags := uint32(0)
+	// Flags
+	flags := fontFlagSymbolic // Symbolic.
 	if ttf.IsFixedPitch {
-		flags |= 1
+		flags |= fontFlagFixedPitch
 	}
 	if ttf.ItalicAngle != 0 {
-		flags |= 1 << 6
+		flags |= fontFlagItalic
 	}
-	flags |= 1 << 2 // Symbolic.
 	descriptor.Flags = core.MakeInteger(int64(flags))
 
 	base.fontDescriptor = descriptor

pdf/model/font_simple.go

@@ -426,13 +426,12 @@ func NewPdfFontFromTTFFile(filePath string) (*PdfFont, error) {
 		descriptor.StemV = core.MakeInteger(70)
 	}
 
-	// Flags.
-	flags := 1 << 5
+	flags := fontFlagNonsymbolic
 	if ttf.IsFixedPitch {
-		flags |= 1
+		flags |= fontFlagFixedPitch
 	}
 	if ttf.ItalicAngle != 0 {
-		flags |= 1 << 6
+		flags |= fontFlagItalic
 	}
 	descriptor.Flags = core.MakeInteger(int64(flags))