Color appearance model library (a23d0548) · Commits · e / os / android_frameworks_base

core/java/com/android/internal/graphics/ColorUtils.java

+31 −0

Original line number	Diff line number	Diff line
		@@ -22,6 +22,8 @@ import android.annotation.IntRange;
		import android.annotation.NonNull;
		import android.graphics.Color;

		import com.android.internal.graphics.cam.Cam;

		/**
		* Copied from: frameworks/support/core-utils/java/android/support/v4/graphics/ColorUtils.java
		*
		@@ -332,6 +334,35 @@ public final class ColorUtils {
		return Color.rgb(r, g, b);
		}

		/**
		* Convert the ARGB color to a color appearance model.
		*
		* The color appearance model is based on CAM16 hue and chroma, using Lab's L as the
		* third dimension.
		*
		* @param color the ARGB color to convert. The alpha component is ignored.
		*/
		public static Cam colorToCAM(@ColorInt int color) {
		return Cam.fromInt(color);
		}

		/**
		* Convert a color appearance model representation to an ARGB color.
		*
		* Note: the returned color may have a lower chroma than requested. Whether a chroma is
		* available depends on luminance. For example, there's no such thing as a high chroma light
		* red, due to the limitations of our eyes and/or physics. If the requested chroma is
		* unavailable, the highest possible chroma at the requested luminance is returned.
		*
		* @param hue hue, in degrees, in CAM coordinates
		* @param chroma chroma in CAM coordinates.
		* @param lstar perceptual luminance, L* in Lab*
		*/
		@ColorInt
		public static int CAMToColor(float hue, float chroma, float lstar) {
		return Cam.getInt(hue, chroma, lstar);
		}

		/**
		* Set the alpha component of {@code color} to be {@code alpha}.
		*/