From 5cc5b23dcea03e624c95e86933725efcd5d2d59a Mon Sep 17 00:00:00 2001
From: Marcelo Arteiro <arteiro@google.com>
Date: Tue, 11 Oct 2022 15:55:31 +0000
Subject: Monochromatic Theme

Definition of Monochromatic Theme and feature flag.

Test: atest ColorSchemeTest
Bug: 241778903
Change-Id: I3c729d9cb8f9eccb2e435849bd50a88513d99c0a
---
 .../monet/src/com/android/systemui/monet/ColorScheme.kt     | 13 ++++++++++---
 packages/SystemUI/src/com/android/systemui/flags/Flags.java |  3 +++
 .../com/android/systemui/theme/ThemeOverlayController.java  | 12 ++++++++++--
 .../src/com/android/systemui/monet/ColorSchemeTest.java     | 12 ++++++++++++
 4 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/packages/SystemUI/monet/src/com/android/systemui/monet/ColorScheme.kt b/packages/SystemUI/monet/src/com/android/systemui/monet/ColorScheme.kt
index b3dd95553ed0..dee0f5cd1979 100644
--- a/packages/SystemUI/monet/src/com/android/systemui/monet/ColorScheme.kt
+++ b/packages/SystemUI/monet/src/com/android/systemui/monet/ColorScheme.kt
@@ -205,6 +205,13 @@ enum class Style(internal val coreSpec: CoreSpec) {
             n1 = TonalSpec(HueSource(), ChromaMultiple(0.0833)),
             n2 = TonalSpec(HueSource(), ChromaMultiple(0.1666))
     )),
+    MONOCHROMATIC(CoreSpec(
+            a1 = TonalSpec(HueSource(), ChromaConstant(.0)),
+            a2 = TonalSpec(HueSource(), ChromaConstant(.0)),
+            a3 = TonalSpec(HueSource(), ChromaConstant(.0)),
+            n1 = TonalSpec(HueSource(), ChromaConstant(.0)),
+            n2 = TonalSpec(HueSource(), ChromaConstant(.0))
+    )),
 }
 
 class ColorScheme(
@@ -219,7 +226,7 @@ class ColorScheme(
     val neutral1: List<Int>
     val neutral2: List<Int>
 
-    constructor(@ColorInt seed: Int, darkTheme: Boolean):
+    constructor(@ColorInt seed: Int, darkTheme: Boolean) :
             this(seed, darkTheme, Style.TONAL_SPOT)
 
     @JvmOverloads
@@ -227,7 +234,7 @@ class ColorScheme(
         wallpaperColors: WallpaperColors,
         darkTheme: Boolean,
         style: Style = Style.TONAL_SPOT
-    ):
+    ) :
             this(getSeedColor(wallpaperColors, style != Style.CONTENT), darkTheme, style)
 
     val allAccentColors: List<Int>
@@ -472,4 +479,4 @@ class ColorScheme(
             return huePopulation
         }
     }
-}
\ No newline at end of file
+}
diff --git a/packages/SystemUI/src/com/android/systemui/flags/Flags.java b/packages/SystemUI/src/com/android/systemui/flags/Flags.java
index d89451992351..f88a5fbda0f4 100644
--- a/packages/SystemUI/src/com/android/systemui/flags/Flags.java
+++ b/packages/SystemUI/src/com/android/systemui/flags/Flags.java
@@ -211,6 +211,9 @@ public class Flags {
     // 803 - screen contents translation
     public static final UnreleasedFlag SCREEN_CONTENTS_TRANSLATION = new UnreleasedFlag(803);
 
+    // 804 - monochromatic themes
+    public static final UnreleasedFlag MONOCHROMATIC_THEMES = new UnreleasedFlag(804);
+
     /***************************************/
     // 900 - media
     public static final ReleasedFlag MEDIA_TAP_TO_TRANSFER = new ReleasedFlag(900);
diff --git a/packages/SystemUI/src/com/android/systemui/theme/ThemeOverlayController.java b/packages/SystemUI/src/com/android/systemui/theme/ThemeOverlayController.java
index 3d56f2317660..3ecb15b9d79c 100644
--- a/packages/SystemUI/src/com/android/systemui/theme/ThemeOverlayController.java
+++ b/packages/SystemUI/src/com/android/systemui/theme/ThemeOverlayController.java
@@ -79,6 +79,7 @@ import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.io.PrintWriter;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.HashSet;
@@ -114,6 +115,7 @@ public class ThemeOverlayController implements CoreStartable, Dumpable {
     private final SecureSettings mSecureSettings;
     private final Executor mMainExecutor;
     private final Handler mBgHandler;
+    private final boolean mIsMonochromaticEnabled;
     private final Context mContext;
     private final boolean mIsMonetEnabled;
     private final UserTracker mUserTracker;
@@ -363,6 +365,7 @@ public class ThemeOverlayController implements CoreStartable, Dumpable {
             UserTracker userTracker, DumpManager dumpManager, FeatureFlags featureFlags,
             @Main Resources resources, WakefulnessLifecycle wakefulnessLifecycle) {
         mContext = context;
+        mIsMonochromaticEnabled = featureFlags.isEnabled(Flags.MONOCHROMATIC_THEMES);
         mIsMonetEnabled = featureFlags.isEnabled(Flags.MONET);
         mDeviceProvisionedController = deviceProvisionedController;
         mBroadcastDispatcher = broadcastDispatcher;
@@ -665,8 +668,13 @@ public class ThemeOverlayController implements CoreStartable, Dumpable {
         // Allow-list of Style objects that can be created from a setting string, i.e. can be
         // used as a system-wide theme.
         // - Content intentionally excluded, intended for media player, not system-wide
-        List<Style> validStyles = Arrays.asList(Style.EXPRESSIVE, Style.SPRITZ, Style.TONAL_SPOT,
-                Style.FRUIT_SALAD, Style.RAINBOW, Style.VIBRANT);
+        List<Style> validStyles = new ArrayList<>(Arrays.asList(Style.EXPRESSIVE, Style.SPRITZ,
+                Style.TONAL_SPOT, Style.FRUIT_SALAD, Style.RAINBOW, Style.VIBRANT));
+
+        if (mIsMonochromaticEnabled) {
+            validStyles.add(Style.MONOCHROMATIC);
+        }
+
         Style style = mThemeStyle;
         final String overlayPackageJson = mSecureSettings.getStringForUser(
                 Settings.Secure.THEME_CUSTOMIZATION_OVERLAY_PACKAGES,
diff --git a/packages/SystemUI/tests/src/com/android/systemui/monet/ColorSchemeTest.java b/packages/SystemUI/tests/src/com/android/systemui/monet/ColorSchemeTest.java
index 0badd861787d..1bc4719c70b7 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/monet/ColorSchemeTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/monet/ColorSchemeTest.java
@@ -146,6 +146,18 @@ public class ColorSchemeTest extends SysuiTestCase {
         Assert.assertTrue(cam.getChroma() <= 8.0);
     }
 
+    @Test
+    public void testMonochromatic() {
+        int colorInt = 0xffB3588A; // H350 C50 T50
+        ColorScheme colorScheme = new ColorScheme(colorInt, false /* darkTheme */,
+                Style.MONOCHROMATIC /* style */);
+        int neutralMid = colorScheme.getNeutral1().get(colorScheme.getNeutral1().size() / 2);
+        Assert.assertTrue(
+                Color.red(neutralMid) == Color.green(neutralMid)
+                && Color.green(neutralMid) == Color.blue(neutralMid)
+        );
+    }
+
     @Test
     @SuppressWarnings("ResultOfMethodCallIgnored")
     public void testToString() {
-- 
cgit v1.2.3-59-g8ed1b