Update clock complication text protection.

We use the same double-shadow approach used by launcher.

Bug: 239089588
Test: manually on device
Change-Id: Idd7ed7627c4f5773fa9b0d0c6fd6d467c07ff773

packages/SystemUI/res/layout/dream_overlay_complication_clock_time.xml

@@ -14,7 +14,7 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
 -->
-<TextClock
+<com.android.systemui.dreams.complication.DoubleShadowTextClock
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/time_view"
     android:layout_width="wrap_content"
@@ -23,8 +23,6 @@
     android:textColor="@android:color/white"
     android:format12Hour="@string/dream_time_complication_12_hr_time_format"
     android:format24Hour="@string/dream_time_complication_24_hr_time_format"
-    android:shadowColor="@color/keyguard_shadow_color"
-    android:shadowRadius="?attr/shadowRadius"
     android:fontFeatureSettings="pnum, lnum"
     android:letterSpacing="0.02"
     android:textSize="@dimen/dream_overlay_complication_clock_time_text_size"/>

packages/SystemUI/res/values/colors.xml

@@ -241,4 +241,6 @@
     <color name="dream_overlay_aqi_very_unhealthy">#AD1457</color>
     <color name="dream_overlay_aqi_hazardous">#880E4F</color>
     <color name="dream_overlay_aqi_unknown">#BDC1C6</color>
+    <color name="dream_overlay_clock_key_text_shadow_color">#4D000000</color>
+    <color name="dream_overlay_clock_ambient_text_shadow_color">#4D000000</color>
 </resources>

packages/SystemUI/res/values/dimens.xml

@@ -1539,4 +1539,10 @@
     <dimen name="broadcast_dialog_btn_text_size">16sp</dimen>
     <dimen name="broadcast_dialog_btn_minHeight">44dp</dimen>
     <dimen name="broadcast_dialog_margin">16dp</dimen>
+    <dimen name="dream_overlay_clock_key_text_shadow_dx">0dp</dimen>
+    <dimen name="dream_overlay_clock_key_text_shadow_dy">0dp</dimen>
+    <dimen name="dream_overlay_clock_key_text_shadow_radius">5dp</dimen>
+    <dimen name="dream_overlay_clock_ambient_text_shadow_dx">0dp</dimen>
+    <dimen name="dream_overlay_clock_ambient_text_shadow_dy">0dp</dimen>
+    <dimen name="dream_overlay_clock_ambient_text_shadow_radius">1dp</dimen>
 </resources>

packages/SystemUI/src/com/android/systemui/dreams/complication/DoubleShadowTextClock.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2022 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.dreams.complication;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.widget.TextClock;
+
+import com.android.systemui.R;
+
+/**
+ * Extension of {@link TextClock} which draws two shadows on the text (ambient and key shadows)
+ */
+public class DoubleShadowTextClock extends TextClock {
+    private final float mAmbientShadowBlur;
+    private final int mAmbientShadowColor;
+    private final float mKeyShadowBlur;
+    private final float mKeyShadowOffsetX;
+    private final float mKeyShadowOffsetY;
+    private final int mKeyShadowColor;
+    private final float mAmbientShadowOffsetX;
+    private final float mAmbientShadowOffsetY;
+
+    public DoubleShadowTextClock(Context context) {
+        this(context, null);
+    }
+
+    public DoubleShadowTextClock(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public DoubleShadowTextClock(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        mKeyShadowBlur = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_key_text_shadow_radius);
+        mKeyShadowOffsetX = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_key_text_shadow_dx);
+        mKeyShadowOffsetY = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_key_text_shadow_dy);
+        mKeyShadowColor = context.getResources().getColor(
+                R.color.dream_overlay_clock_key_text_shadow_color);
+        mAmbientShadowBlur = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_ambient_text_shadow_radius);
+        mAmbientShadowColor = context.getResources().getColor(
+                R.color.dream_overlay_clock_ambient_text_shadow_color);
+        mAmbientShadowOffsetX = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_ambient_text_shadow_dx);
+        mAmbientShadowOffsetY = context.getResources()
+                .getDimensionPixelSize(R.dimen.dream_overlay_clock_ambient_text_shadow_dy);
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        // We enhance the shadow by drawing the shadow twice
+        getPaint().setShadowLayer(mAmbientShadowBlur, mAmbientShadowOffsetX, mAmbientShadowOffsetY,
+                mAmbientShadowColor);
+        super.onDraw(canvas);
+        canvas.save();
+        canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
+                getScrollX() + getWidth(),
+                getScrollY() + getHeight());
+
+        getPaint().setShadowLayer(
+                mKeyShadowBlur, mKeyShadowOffsetX, mKeyShadowOffsetY, mKeyShadowColor);
+        super.onDraw(canvas);
+        canvas.restore();
+    }
+}