LibPDF: Add glyph drawing and type info methods to PDFFont

A PDFFont can now be asked for its specific type and whether it is part
of the standard 14 fonts. It now also contains a method to draw a
glyph, which is stubbed-out for now.

This will be useful for the renderer to take into consideration when
drawing text, since we don't include replacements for the standard set
of fonts yet, but still want to make use of embedded fonts when
available.

Userland/Libraries/LibPDF/Fonts/PDFFont.h

@@ -6,18 +6,33 @@
 
 #pragma once
 
+#include <LibGfx/Forward.h>
 #include <LibPDF/Document.h>
 
 namespace PDF {
 
 class PDFFont : public RefCounted<PDFFont> {
 public:
+    enum class Type {
+        Type0,
+        Type1,
+        TrueType
+    };
+
     static PDFErrorOr<NonnullRefPtr<PDFFont>> create(Document*, NonnullRefPtr<DictObject>);
 
     virtual ~PDFFont() = default;
 
     virtual u32 char_code_to_code_point(u16 char_code) const = 0;
     virtual float get_char_width(u16 char_code, float font_size) const = 0;
+
+    virtual void draw_glyph(Gfx::Painter& painter, Gfx::IntPoint const& point, float width, u32 code_point, Color color) = 0;
+
+    virtual bool is_standard_font() const { return m_is_standard_font; }
+    virtual Type type() const = 0;
+
+protected:
+    bool m_is_standard_font { false };
 };
 
 }

Userland/Libraries/LibPDF/Fonts/TrueTypeFont.h

@@ -21,6 +21,10 @@ public:
     u32 char_code_to_code_point(u16 char_code) const override;
     float get_char_width(u16 char_code, float font_size) const override;
 
+    void draw_glyph(Gfx::Painter&, Gfx::IntPoint const&, float, u32, Color) override {};
+
+    Type type() const override { return PDFFont::Type::TrueType; }
+
 private:
     NonnullRefPtr<TTF::Font> m_ttf_font;
     Type1Font::Data m_data;

Userland/Libraries/LibPDF/Fonts/Type0Font.h

@@ -26,6 +26,10 @@ public:
     u32 char_code_to_code_point(u16 char_code) const override;
     float get_char_width(u16 char_code, float font_size) const override;
 
+    void draw_glyph(Gfx::Painter&, Gfx::IntPoint const&, float, u32, Color) override {};
+
+    Type type() const override { return PDFFont::Type::Type0; }
+
 private:
     CIDSystemInfo m_system_info;
     HashMap<u16, u16> m_widths;

Userland/Libraries/LibPDF/Fonts/Type1Font.cpp

@@ -68,7 +68,7 @@ PDFErrorOr<Type1Font::Data> Type1Font::parse_data(Document* document, NonnullRef
     if (descriptor->contains(CommonNames::MissingWidth))
         missing_width = descriptor->get_value(CommonNames::MissingWidth).to_int();
 
-    return Type1Font::Data { to_unicode, encoding.release_nonnull(), move(widths), missing_width };
+    return Type1Font::Data { to_unicode, encoding.release_nonnull(), move(widths), missing_width, false };
 }
 
 PDFErrorOr<NonnullRefPtr<Type1Font>> Type1Font::create(Document* document, NonnullRefPtr<DictObject> dict)
@@ -80,6 +80,7 @@ PDFErrorOr<NonnullRefPtr<Type1Font>> Type1Font::create(Document* document, Nonnu
 Type1Font::Type1Font(Data data)
     : m_data(move(data))
 {
+    m_is_standard_font = data.is_standard_font;
 }
 
 u32 Type1Font::char_code_to_code_point(u16 char_code) const

Userland/Libraries/LibPDF/Fonts/Type1Font.h

@@ -19,6 +19,7 @@ public:
         NonnullRefPtr<Encoding> encoding;
         HashMap<u16, u16> widths;
         u16 missing_width;
+        bool is_standard_font;
     };
 
     static PDFErrorOr<Data> parse_data(Document*, NonnullRefPtr<DictObject> font_dict);
@@ -31,6 +32,10 @@ public:
     u32 char_code_to_code_point(u16 char_code) const override;
     float get_char_width(u16 char_code, float font_size) const override;
 
+    void draw_glyph(Gfx::Painter&, Gfx::IntPoint const&, float, u32, Color) override {};
+
+    Type type() const override { return PDFFont::Type::Type1; }
+
 private:
     Data m_data;
 };