ColorUtil.java 文件源码

/**
 * Calculate a variant of the color to make it more suitable for overlaying information. Light
 * colors will be lightened and dark colors will be darkened
 *
 * @param color               the color to adjust
 * @param isDark              whether {@code color} is light or dark
 * @param lightnessMultiplier the amount to modify the color e.g. 0.1f will alter it by 10%
 * @return the adjusted color
 */
public static
@ColorInt
int scrimify(@ColorInt int color,
             boolean isDark,
             @FloatRange(from = 0f, to = 1f) float lightnessMultiplier) {
    float[] hsl = new float[3];
    android.support.v4.graphics.ColorUtils.colorToHSL(color, hsl);

    if (!isDark) {
        lightnessMultiplier += 1f;
    } else {
        lightnessMultiplier = 1f - lightnessMultiplier;
    }


    hsl[2] = constrain(0f, 1f, hsl[2] * lightnessMultiplier);
    return android.support.v4.graphics.ColorUtils.HSLToColor(hsl);
}