Custom Font

Load Custom Fonts from .TTF

Aspose.Slides lets you load fonts for rendering in presentations without even installing them. This article shows how to load fonts from custom directories without installing them. Please follow the steps below to loading Fonts from external directories by using Aspose.Slides for C++ API:

  • Create an instance of FontsLoader Class and call the static method LoadExternalFonts.
  • Perform render the presentation.
  • Clear the cache in the FontsLoader Class.

The implementation of the above is given below.

const String fontPath = u"../templates/";
const String outPath = u"../out/UseCustomFonts_out.pptx";
const String templatePath = u"../templates/DefaultFonts.pptx";

//Setting fonts path
ArrayPtr<String> folders = System::MakeObject<Array<String>>(1, fontPath);

// Load the custom font directory fonts
FontsLoader::LoadExternalFonts(folders);

// Do Some work and perform presentation/slides rendering
SharedPtr<Presentation> pres = MakeObject<Presentation>(templatePath);
pres->Save(outPath, Export::SaveFormat::Pptx);

// Clear Font Cache
FontsLoader::ClearCache();

Get Custom Fonts Folder

A new property has been added that returns folders where font files are searched. Those are folders that have been added with LoadExternalFonts method as well as system font folders.

// The following line shall return folders where font files are searched.
// Those are folders that have been added with LoadExternalFonts method as well as system font folders.
auto fontFolders = FontsLoader::GetFontFolders();

Specify Custom Fonts Used With Presentation

A new DocumentLevelFontSources property has been added to ILoadOptions interface. It allows to specify external fonts that are used with the presentation. Sample Code is given below.

auto memoryFont1 = File::ReadAllBytes(u"customfonts\\CustomFont1.ttf");
auto memoryFont2 = File::ReadAllBytes(u"customfonts\\CustomFont2.ttf");

auto loadOptions = System::MakeObject<LoadOptions>();
loadOptions->get_DocumentLevelFontSources()->set_FontFolders(System::MakeArray<String>({u"assets\\fonts", u"global\\fonts"}));
loadOptions->get_DocumentLevelFontSources()->set_MemoryFonts(System::MakeArray<ArrayPtr<uint8_t>>({memoryFont1, memoryFont2}));
{
    auto presentation = System::MakeObject<Presentation>(u"MyPresentation.pptx", loadOptions);
    //work with the presentation
    //CustomFont1, CustomFont2 as well as fonts from assets\fonts & global\fonts folders and their subfolders are available to the presentation
}

Manage Fonts Externally

Now, you can also load fonts externally into a byte array. FontsLoader class now offer, LoadExternalFont(byte[] data) method that allows to add fonts from binary data. The implementation of the above steps is given below.

Default Font