void setPixelSizes (int pixelWidth, int pixelHeight) {
        this.pixelWidth = pixelWidth;
        this.pixelHeight = pixelHeight;
        if (!bitmapped && !face.setPixelSizes(pixelWidth, pixelHeight)) throw new GdxRuntimeException("Couldn't set size for font");
    }
Generates a new {@link BitmapFontData} instance, expert usage only. Throws a GdxRuntimeException if something went wrong.
@param size the size in pixels
core/src/com/badlogic/gdx/graphics/g2d/freetype/FreeTypeFontGenerator.java