livedisplay: Implement active display adjustment

 * LiveDisplay is our new name for the various display technologies
   which adjust the screen based on environmental conditions other
   than the standard automatic backlight controls.
 * This patch implements automatic color temperature adjustment based
   on time of day. This is similar to f.lux or Redshift. My eyes are
   so happy now!
 * Automatic outdoor/SRE feature is now handled here.
 * Handling of CABC/CABL and color enhancements also handled here.
 * Manual RGB tweaking is handled here.
 * Can delegate to DisplayColor HAL if available, otherwise uses
   SurfaceFlinger's 1015 operation to apply changes.
 * Happily coexists with the new accessibility features for color
   blindness correction and color inversion.
 * All postprocessing will be disabled when powersave mode is
   activated.

Change-Id: Iac1b74f410957f8e2d8290465c4ce9cc1fd97a88

1 files changed, 23 insertions, 1 deletions

diff --git a/services/accessibility/java/com/android/server/accessibility/DisplayAdjustmentUtils.java b/services/accessibility/java/com/android/server/accessibility/DisplayAdjustmentUtils.java
index d0b5898..ab8eacf 100644
--- a/services/accessibility/java/com/android/server/accessibility/DisplayAdjustmentUtils.java
+++ b/services/accessibility/java/com/android/server/accessibility/DisplayAdjustmentUtils.java
@@ -30,7 +30,7 @@ import android.view.accessibility.AccessibilityManager;
 /**
  * Utility methods for performing accessibility display adjustments.
  */
-class DisplayAdjustmentUtils {
+public class DisplayAdjustmentUtils {
     private static final String LOG_TAG = DisplayAdjustmentUtils.class.getSimpleName();
 
     /** Matrix and offset used for converting color to gray-scale. */
@@ -76,6 +76,11 @@ class DisplayAdjustmentUtils {
             return true;
         }
 
+        if (Settings.Secure.getStringForUser(cr,
+                Settings.Secure.LIVE_DISPLAY_COLOR_MATRIX, userId) != null) {
+            return true;
+        }
+
         return false;
     }
 
@@ -91,6 +96,23 @@ class DisplayAdjustmentUtils {
             colorMatrix = multiply(colorMatrix, INVERSION_MATRIX_VALUE_ONLY);
         }
 
+        String adj = Settings.Secure.getStringForUser(cr,
+                Settings.Secure.LIVE_DISPLAY_COLOR_MATRIX, userId);
+        if (adj != null) {
+            String[] tmp = adj.split(" ");
+            if (tmp.length == 16) {
+                float[] adjMatrix = new float[16];
+                try {
+                    for (int i = 0; i < 16; i++) {
+                        adjMatrix[i] = Float.parseFloat(tmp[i]);
+                    }
+                    colorMatrix = multiply(colorMatrix, adjMatrix);
+                } catch (NumberFormatException e) {
+                    Slog.e(LOG_TAG, e.getMessage(), e);
+                }
+            }
+        }
+
         if (Settings.Secure.getIntForUser(cr,
                 Settings.Secure.ACCESSIBILITY_DISPLAY_DALTONIZER_ENABLED, 0, userId) != 0) {
             final int daltonizerMode = Settings.Secure.getIntForUser(cr,