livedisplay: Don't explode if no modes are available

* Don't create the mode observer or try to publish tiles if none
   of the adaptive modes are supported.

Change-Id: Iee6fe8131b0614e10f35b5a03d65fb44c71c0da9

sdk/src/java/cyanogenmod/hardware/LiveDisplayConfig.java

@@ -39,6 +39,8 @@ import cyanogenmod.os.Concierge.ParcelInfo;
 public class LiveDisplayConfig implements Parcelable {
 
     private final BitSet mCapabilities;
+    private final BitSet mAllModes = new BitSet();
+
     private final int mDefaultDayTemperature;
     private final int mDefaultNightTemperature;
     private final int mDefaultMode;
@@ -54,6 +56,7 @@ public class LiveDisplayConfig implements Parcelable {
             boolean defaultCABC, boolean defaultColorEnhancement) {
         super();
         mCapabilities = (BitSet) capabilities.clone();
+        mAllModes.set(MODE_FIRST, MODE_LAST);
         mDefaultMode = defaultMode;
         mDefaultDayTemperature = defaultDayTemperature;
         mDefaultNightTemperature = defaultNightTemperature;
@@ -91,6 +94,7 @@ public class LiveDisplayConfig implements Parcelable {
 
         // set temps
         mCapabilities = BitSet.valueOf(new long[] { capabilities });
+        mAllModes.set(MODE_FIRST, MODE_LAST);
         mDefaultMode = defaultMode;
         mDefaultDayTemperature = defaultDayTemperature;
         mDefaultNightTemperature = defaultNightTemperature;
@@ -162,6 +166,15 @@ public class LiveDisplayConfig implements Parcelable {
         return !mCapabilities.isEmpty();
     }
 
+    /**
+     * Checks if LiveDisplay has support for adaptive modes.
+     *
+     * @return true if adaptive modes are available
+     */
+    public boolean hasModeSupport() {
+        return isAvailable() && mCapabilities.intersects(mAllModes);
+    }
+
     /**
      * Gets the default color temperature to use in the daytime. This is typically
      * set to 6500K, however this may not be entirely accurate. Use this value for