Libgdx FreeTypeFontGenerator with AssetManager

问题:

i'd like to use the asset manager in combination with the FreeTypeFontGenerator.

I dont want to load fnt files cause they display differently on different screenresolutions. So what i do currently is generating my fonts on the fly in every actor or screen. Now i think its best to generate the fonts once when the game is started and load them into the asset manager. But the AssetManager seems to need a filename with the BitmapFont.class parameter. What i want to do is generate 5 different bitmapfonts and and load those BitmapFonts into the assetmanager, so i have all my ressources in one place, and can reuse them. I could just create those BitmapFonts, save them in a list, and give the list to every actor or screen, just like i do with the assetmanager i manage my textures and audio with. But it would be more elegant to have everything in one place, the asset manager.

So, is there a way to load BitmapFonts created with FreeTypeFontGenerator into the assetmanager?

回答1:

Here you can read about how to supply your own AssetLoader.

You would have to implement either a SynchronousAssetLoader or an AsynchronousAssetLoader. Those Would get the file to a free type font. With that you can use the generator to generate your desired BitmapFont. Since you want to use the asset manager, you have to overwrite the default loader for bitmap fonts like this:

manager.setLoader(BitmapFont.class, new MyFreeTypeFontLoader(new InternalFileHandleResolver()));

Via AssetLoaderParameters you could supply further information to your loader, like the font size.

The following code is untested, but might work:

public class FreeTypeFontLoader extends SynchronousAssetLoader<BitmapFont, FreeTypeFontLoader.FreeTypeFontParameters> {

    public FreeTypeFontLoader(FileHandleResolver resolver) {
        super(resolver);
    }

    @Override
    public BitmapFont load(AssetManager assetManager, String fileName, FileHandle file, FreeTypeFontParameters parameter) {
        FreeTypeFontGenerator generator = new FreeTypeFontGenerator(file);

        return generator.generateFont(parameter.fontParameters);
    }

    static public class FreeTypeFontParameters extends AssetLoaderParameters<BitmapFont> {

        public FreeTypeFontParameter fontParameters;
    }

    @Override
    public Array<AssetDescriptor> getDependencies(String fileName, FileHandle file, FreeTypeFontParameters parameter) {
        return null;
    }

}

UPDATE:

This is no longer necessary, the gdx-freetype extension now has loaders for freetype fonts itself!

• FreeTypeFontGeneratorLoader (it's the same like the code above)
• FreeTypeFontLoader
• FreeTypeFontLoaderTest