TrueType and OpenType fonts can be loaded into libRocket by the application. libRocket has no default font, so at least one font must be loaded before text can be rendered.

To load a font, call one of the LoadFontFace() functions on Rocket::Core::FontDatabase. The simplest of these takes just a file name:

// Adds a new font face to the database. The face's family, style and weight will be determined from the face itself.
// @param[in] file_name The file to load the face from.
// @return True if the face was loaded successfully, false otherwise.
static bool LoadFontFace(const Rocket::Core::String& file_name);

This function will load the font file specified (opening it through the file interface). The font’s family (the string you specify the font with using the font-family RCSS property), the style (normal or italic) and weight (normal or bold) are all fetched from the font file itself. libRocket will generate the font data for specific sizes of the font as required by the application.

Note that if you are loading a .ttc, only the first font will be registered.

If you need to override the family name, style or weight of the font, use the more complex LoadFontFace():

// Adds a new font face to the database, ignoring any family, style and weight information stored in the face itself.
// @param[in] file_name The file to load the face from.
// @param[in] family The family to add the face to.
// @param[in] style The style of the face (normal or italic).
// @param[in] weight The weight of the face (normal or bold).
// @return True if the face was loaded successfully, false otherwise.
static bool LoadFontFace(const Rocket::Core::String& file_name,
                         const Rocket::Core::String& family,
                         Rocket::Core::Font::Style style,
                         Rocket::Core::Font::Weight weight);

• style is one of Rocket::Core::Font::STYLE_NORMAL or STYLE_ITALIC;
• weight is one of Rocket::Core::Font::WEIGHT_NORMAL or WEIGHT_BOLD.

The italic and bold versions of a font are selected with the font-weight and font-style RCSS properties.

In the following example, the font file at data/trilobyte.ttf is loaded and registered with libRocket with the family name, style and weight settings specified in the file itself.

Rocket::Core::FontDatabase::LoadFontFace("data/trilobyte.ttf");

In this example, the font file is loaded with overrides for the name, style and weight.

Rocket::Core::FontDatabase::LoadFontFace("data/trilobyte_b.ttf",
                                         "Trilobyte",
                                         Rocket::Core::Font::STYLE_NORMAL,
                                         Rocket::Core::Font::WEIGHT_BOLD);

These fonts would be specified in RCSS with the following rules (assuming ‘trilobyte.ttf’ registers a font of the family ‘Trilobyte’):

body
{
    font-family: Trilobyte;
}

strong
{
    font-weight: bold;
}