Allow config.xml to set the default display's default color mode

Bug: 31928803
Change-Id: I2707ae47611dca134fa9b4afa2d09e0812b3efd3

core/res/res/values/config.xml

@@ -1936,6 +1936,12 @@
          mirror the content of the default display. -->
     <bool name="config_localDisplaysMirrorContent">true</bool>
 
+    <!-- The default mode for the default display. One of the following values (See Display.java):
+             0 - COLOR_MODE_DEFAULT
+             7 - COLOR_MODE_SRGB
+    -->
+    <integer name="config_defaultDisplayDefaultColorMode">0</integer>
+
     <!-- When true use the linux /dev/input/event subsystem to detect the switch changes
          on the headphone/microphone jack. When false use the older uevent framework. -->
     <bool name="config_useDevInputEventForAudioJack">false</bool>

core/res/res/values/symbols.xml

@@ -307,6 +307,7 @@
   <java-symbol type="bool" name="config_supportsMultiWindow" />
   <java-symbol type="bool" name="config_guestUserEphemeral" />
   <java-symbol type="bool" name="config_localDisplaysMirrorContent" />
+  <java-symbol type="integer" name="config_defaultDisplayDefaultColorMode" />
   <java-symbol type="bool" name="config_enableAppWidgetService" />
   <java-symbol type="string" name="config_defaultPictureInPictureBounds" />
   <java-symbol type="integer" name="config_wifi_framework_5GHz_preference_boost_threshold" />

services/core/java/com/android/server/display/DisplayManagerService.java

@@ -220,6 +220,11 @@ public final class DisplayManagerService extends SystemService {
     private final DisplayViewport mTempDefaultViewport = new DisplayViewport();
     private final DisplayViewport mTempExternalTouchViewport = new DisplayViewport();
 
+    // The default color mode for default displays. Overrides the usual
+    // Display.Display.COLOR_MODE_DEFAULT for displays with the
+    // DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY flag set.
+    private final int mDefaultDisplayDefaultColorMode;
+
     // Temporary list of deferred work to perform when setting the display state.
     // Only used by requestDisplayState.  The field is self-synchronized and only
     // intended for use inside of the requestGlobalDisplayStateInternal function.
@@ -232,6 +237,8 @@ public final class DisplayManagerService extends SystemService {
         mUiHandler = UiThread.getHandler();
         mDisplayAdapterListener = new DisplayAdapterListener();
         mSingleDisplayDemoMode = SystemProperties.getBoolean("persist.demo.singledisplay", false);
+        mDefaultDisplayDefaultColorMode = mContext.getResources().getInteger(
+            com.android.internal.R.integer.config_defaultDisplayDefaultColorMode);
 
         PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
         mGlobalDisplayBrightness = pm.getDefaultScreenBrightnessSetting();
@@ -703,6 +710,14 @@ public final class DisplayManagerService extends SystemService {
         }
         if (display != null && display.getPrimaryDisplayDeviceLocked() == device) {
             int colorMode = mPersistentDataStore.getColorMode(device);
+            if (colorMode == Display.COLOR_MODE_INVALID) {
+                if ((device.getDisplayDeviceInfoLocked().flags
+                     & DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY) != 0) {
+                    colorMode = mDefaultDisplayDefaultColorMode;
+                } else {
+                    colorMode = Display.COLOR_MODE_DEFAULT;
+                }
+            }
             display.setRequestedColorModeLocked(colorMode);
         }
         scheduleTraversalLocked(false);
@@ -1043,6 +1058,7 @@ public final class DisplayManagerService extends SystemService {
             pw.println("  mNextNonDefaultDisplayId=" + mNextNonDefaultDisplayId);
             pw.println("  mDefaultViewport=" + mDefaultViewport);
             pw.println("  mExternalTouchViewport=" + mExternalTouchViewport);
+            pw.println("  mDefaultDisplayDefaultColorMode=" + mDefaultDisplayDefaultColorMode);
             pw.println("  mSingleDisplayDemoMode=" + mSingleDisplayDemoMode);
             pw.println("  mWifiDisplayScanRequestCount=" + mWifiDisplayScanRequestCount);
 

services/core/java/com/android/server/display/PersistentDataStore.java

@@ -183,11 +183,11 @@ final class PersistentDataStore {
 
     public int getColorMode(DisplayDevice device) {
         if (!device.hasStableUniqueId()) {
-            return Display.COLOR_MODE_DEFAULT;
+            return Display.COLOR_MODE_INVALID;
         }
         DisplayState state = getDisplayState(device.getUniqueId(), false);
         if (state == null) {
-            return Display.COLOR_MODE_DEFAULT;
+            return Display.COLOR_MODE_INVALID;
         }
         return state.getColorMode();
     }