Merge "Adding a wrapper around Tonal API" into pi-dev

am: 790d1a0efa

Change-Id: Iff442e50199b7ad8ca3538820562b8b975353e48

packages/SystemUI/shared/src/com/android/systemui/shared/system/TonalCompat.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.systemui.shared.system;
+
+import android.app.WallpaperColors;
+import android.content.Context;
+
+import com.android.internal.colorextraction.ColorExtractor.GradientColors;
+import com.android.internal.colorextraction.types.Tonal;
+
+public class TonalCompat {
+
+    private final Tonal mTonal;
+
+    public TonalCompat(Context context) {
+        mTonal = new Tonal(context);
+    }
+
+    public ExtractionInfo extractDarkColors(WallpaperColors colors) {
+        GradientColors darkColors = new GradientColors();
+        mTonal.extractInto(colors, new GradientColors(), darkColors, new GradientColors());
+
+        ExtractionInfo result = new ExtractionInfo();
+        result.mainColor = darkColors.getMainColor();
+        result.secondaryColor = darkColors.getSecondaryColor();
+        result.supportsDarkText = darkColors.supportsDarkText();
+        if (colors != null) {
+            result.supportsDarkTheme =
+                    (colors.getColorHints() & WallpaperColors.HINT_SUPPORTS_DARK_THEME) != 0;
+        }
+        return result;
+    }
+
+    public static class ExtractionInfo {
+        public int mainColor;
+        public int secondaryColor;
+        public boolean supportsDarkText;
+        public boolean supportsDarkTheme;
+    }
+}