Merge "Allow I/O wallpaper to use dark text mode." into sc-dev am: 284edfdc

    private static final float MIN_COLOR_OCCURRENCE = 0.05f;

    // Decides when dark theme is optimal for this wallpaper

    private static final float DARK_THEME_MEAN_LUMINANCE = 0.25f;

    private static final float DARK_THEME_MEAN_LUMINANCE = 0.3f;

    // Minimum mean luminosity that an image needs to have to support dark text

    private static final float BRIGHT_IMAGE_MEAN_LUMINANCE = 0.75f;

    private static final float BRIGHT_IMAGE_MEAN_LUMINANCE = 0.7f;

    // We also check if the image has dark pixels in it,

    // to avoid bright images with some dark spots.

    private static final float DARK_PIXEL_CONTRAST = 6f;

    private static final float DARK_PIXEL_CONTRAST = 5.5f;

    private static final float MAX_DARK_AREA = 0.025f;

    private final List<Color> mMainColors;