Merge "Ensure icon contrast on the shelf" into oc-dev

packages/SystemUI/src/com/android/systemui/statusbar/NotificationShelf.java

@@ -454,7 +454,8 @@ public class NotificationShelf extends ActivatableNotificationView implements
                     || row.getTranslationZ() > mAmbientState.getBaseZHeight()))) {
                 iconState.hidden = true;
             }
-            int shelfColor = icon.getStaticDrawableColor();
+            int backgroundColor = getBackgroundColorWithoutTint();
+            int shelfColor = icon.getContrastedStaticDrawableColor(backgroundColor);
             if (!noIcon && shelfColor != StatusBarIconView.NO_COLOR) {
                 int iconColor = row.getVisibleNotificationHeader().getOriginalIconColor();
                 shelfColor = NotificationUtils.interpolateColors(iconColor, shelfColor,

packages/SystemUI/src/com/android/systemui/statusbar/StatusBarIconView.java

@@ -35,6 +35,7 @@ import android.graphics.drawable.Icon;
 import android.os.Parcelable;
 import android.os.UserHandle;
 import android.service.notification.StatusBarNotification;
+import android.support.v4.graphics.ColorUtils;
 import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.util.FloatProperty;
@@ -46,6 +47,7 @@ import android.view.accessibility.AccessibilityEvent;
 import android.view.animation.Interpolator;
 
 import com.android.internal.statusbar.StatusBarIcon;
+import com.android.internal.util.NotificationColorUtil;
 import com.android.systemui.Interpolators;
 import com.android.systemui.R;
 import com.android.systemui.statusbar.notification.NotificationIconDozeHelper;
@@ -127,6 +129,8 @@ public class StatusBarIconView extends AnimatedImageView {
         setColorInternal(newColor);
     };
     private final NotificationIconDozeHelper mDozer;
+    private int mContrastedDrawableColor;
+    private int mCachedContrastBackgroundColor = NO_COLOR;
 
     public StatusBarIconView(Context context, String slot, StatusBarNotification sbn) {
         this(context, slot, sbn, false);
@@ -528,6 +532,7 @@ public class StatusBarIconView extends AnimatedImageView {
     public void setStaticDrawableColor(int color) {
         mDrawableColor = color;
         setColorInternal(color);
+        updateContrastedStaticColor();
         mIconColor = color;
         mDozer.setColor(color);
     }
@@ -580,6 +585,42 @@ public class StatusBarIconView extends AnimatedImageView {
         return mDrawableColor;
     }
 
+    /**
+     * A drawable color that passes GAR on a specific background.
+     * This value is cached.
+     *
+     * @param backgroundColor Background to test against.
+     * @return GAR safe version of {@link StatusBarIconView#getStaticDrawableColor()}.
+     */
+    int getContrastedStaticDrawableColor(int backgroundColor) {
+        if (mCachedContrastBackgroundColor != backgroundColor) {
+            mCachedContrastBackgroundColor = backgroundColor;
+            updateContrastedStaticColor();
+        }
+        return mContrastedDrawableColor;
+    }
+
+    private void updateContrastedStaticColor() {
+        if (mCachedContrastBackgroundColor == NO_COLOR) {
+            return;
+        }
+        // We'll modify the color if it doesn't pass GAR
+        int contrastedColor = mDrawableColor;
+        if (!NotificationColorUtil.satisfiesTextContrast(mCachedContrastBackgroundColor,
+                contrastedColor)) {
+            float[] hsl = new float[3];
+            ColorUtils.colorToHSL(mDrawableColor, hsl);
+            // This is basically a light grey, pushing the color will only distort it.
+            // Best thing to do in here is to fallback to the default color.
+            if (hsl[1] < 0.2f) {
+                contrastedColor = Notification.COLOR_DEFAULT;
+            }
+            contrastedColor = NotificationColorUtil.resolveContrastColor(mContext,
+                    contrastedColor, mCachedContrastBackgroundColor);
+        }
+        mContrastedDrawableColor = contrastedColor;
+    }
+
     public void setVisibleState(int state) {
         setVisibleState(state, true /* animate */, null /* endRunnable */);
     }

packages/SystemUI/tests/src/com/android/systemui/statusbar/StatusBarIconViewTest.java

@@ -16,8 +16,10 @@
 
 package com.android.systemui.statusbar;
 
+import static junit.framework.Assert.assertEquals;
 import static junit.framework.Assert.assertFalse;
 import static junit.framework.Assert.assertNull;
+import static junit.framework.Assert.assertTrue;
 
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
@@ -33,12 +35,14 @@ import android.content.ContextWrapper;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
+import android.graphics.Color;
 import android.graphics.drawable.Icon;
 import android.os.UserHandle;
 import android.support.test.filters.SmallTest;
 import android.support.test.runner.AndroidJUnit4;
 
 import com.android.internal.statusbar.StatusBarIcon;
+import com.android.internal.util.NotificationColorUtil;
 import com.android.systemui.R;
 import com.android.systemui.SysuiTestCase;
 
@@ -100,4 +104,17 @@ public class StatusBarIconViewTest extends SysuiTestCase {
 
         assertFalse(mIconView.set(mStatusBarIcon));
     }
+
+    @Test
+    public void testGetContrastedStaticDrawableColor() {
+        mIconView.setStaticDrawableColor(Color.DKGRAY);
+        int color = mIconView.getContrastedStaticDrawableColor(Color.WHITE);
+        assertEquals("Color should not change when we have enough contrast",
+                Color.DKGRAY, color);
+
+        mIconView.setStaticDrawableColor(Color.WHITE);
+        color = mIconView.getContrastedStaticDrawableColor(Color.WHITE);
+        assertTrue("Similar colors should be shifted to satisfy contrast",
+                NotificationColorUtil.satisfiesTextContrast(Color.WHITE, color));
+    }
 }