Add a color inversion algorithm to Android.

This flips the colors in the page (not including images) to use OLED's
lower power when displaying dark colors.

frameworks/base part of the change.

Change-Id: I250083c9c60cf68f906991252d81f0bbec32bc6e

2 files changed, 21 insertions, 0 deletions

diff --git a/core/java/android/webkit/WebSettings.java b/core/java/android/webkit/WebSettings.java
index cfb6b92..1f1a088 100644
--- a/core/java/android/webkit/WebSettings.java
+++ b/core/java/android/webkit/WebSettings.java
@@ -178,6 +178,7 @@ public class WebSettings {
     private boolean         mUseWideViewport = false;
     private boolean         mSupportMultipleWindows = false;
     private boolean         mShrinksStandaloneImagesToFit = false;
+    private boolean         mInvertColor = false;
     // HTML5 API flags
     private boolean         mAppCacheEnabled = false;
     private boolean         mDatabaseEnabled = false;
@@ -1387,6 +1388,23 @@ public class WebSettings {
         }
      }
 
+    /**
+     * @hide
+     */
+    public synchronized void setInvertColor(boolean invert) {
+        if (mInvertColor != invert) {
+            mInvertColor = invert;
+            postSync();
+        }
+    }
+
+    /**
+     * @hide
+     */
+    public synchronized boolean getInvertColor() {
+        return mInvertColor;
+    }
+
     int getDoubleTapToastCount() {
         return mDoubleTapToastCount;
     }
diff --git a/core/java/android/webkit/WebViewCore.java b/core/java/android/webkit/WebViewCore.java
index 68c0fb8..c39f867 100644
--- a/core/java/android/webkit/WebViewCore.java
+++ b/core/java/android/webkit/WebViewCore.java
@@ -525,6 +525,8 @@ final class WebViewCore {
 
     private native void nativeSetBackgroundColor(int color);
 
+    private native void nativeSetColorInversion(boolean invert);
+
     private native void nativeDumpDomTree(boolean useFile);
 
     private native void nativeDumpRenderTree(boolean useFile);
@@ -1792,6 +1794,7 @@ final class WebViewCore {
             df = mScrollFilter;
         }
         canvas.setDrawFilter(df);
+        nativeSetColorInversion(mSettings.getInvertColor());
         boolean tookTooLong = nativeDrawContent(canvas, color);
         canvas.setDrawFilter(null);
         if (tookTooLong && mSplitPictureIsScheduled == false) {