Merge "FastBitmapDrawable can draw an icon badge (notification count)" into ub-launcher3-master

1 files changed, 63 insertions, 0 deletions

diff --git a/src/com/android/launcher3/graphics/IconPalette.java b/src/com/android/launcher3/graphics/IconPalette.java
new file mode 100644
index 000000000..dcc5fcb14
--- /dev/null
+++ b/src/com/android/launcher3/graphics/IconPalette.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2017 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.launcher3.graphics;
+
+import android.graphics.Color;
+import android.support.v4.graphics.ColorUtils;
+
+/**
+ * Contains colors based on the dominant color of an icon.
+ */
+public class IconPalette {
+
+    public int backgroundColor;
+    public int textColor;
+
+    public static IconPalette fromDominantColor(int dominantColor) {
+        IconPalette palette = new IconPalette();
+        palette.backgroundColor = getMutedColor(dominantColor);
+        palette.textColor = getTextColorForBackground(palette.backgroundColor);
+        return palette;
+    }
+
+    private static int getMutedColor(int color) {
+        int alpha = (int) (255 * 0.2f);
+        return ColorUtils.compositeColors(ColorUtils.setAlphaComponent(color, alpha), Color.WHITE);
+    }
+
+    private static int getTextColorForBackground(int backgroundColor) {
+        return getLighterOrDarkerVersionOfColor(backgroundColor, 3f);
+    }
+
+    private static int getLowContrastColor(int color) {
+        return getLighterOrDarkerVersionOfColor(color, 1.5f);
+    }
+
+    private static int getLighterOrDarkerVersionOfColor(int color, float contrastRatio) {
+        int whiteMinAlpha = ColorUtils.calculateMinimumAlpha(Color.WHITE, color, contrastRatio);
+        int blackMinAlpha = ColorUtils.calculateMinimumAlpha(Color.BLACK, color, contrastRatio);
+        int translucentWhiteOrBlack;
+        if (whiteMinAlpha >= 0) {
+            translucentWhiteOrBlack = ColorUtils.setAlphaComponent(Color.WHITE, whiteMinAlpha);
+        } else if (blackMinAlpha >= 0) {
+            translucentWhiteOrBlack = ColorUtils.setAlphaComponent(Color.BLACK, blackMinAlpha);
+        } else {
+            translucentWhiteOrBlack = Color.WHITE;
+        }
+        return ColorUtils.compositeColors(translucentWhiteOrBlack, color);
+    }
+}