diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 2e81bdf..f1253b4 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -338,6 +338,8 @@
             <!-- If true, use functionalTextColor instead of ketTextColor to drawing the label on
                  the key -->
             <flag name="followFunctionalTextColor" value="0x80000" />
+            <!-- Keep aspect ratio of key background. -->
+            <flag name="keepBackgroundAspectRatio" value="0x100000" />
             <!-- If true, disable keyHintLabel. -->
             <flag name="disableKeyHintLabel" value="0x40000000" />
             <!-- If true, disable additionalMoreKeys. -->
diff --git a/java/res/values/themes-lxx-dark.xml b/java/res/values/themes-lxx-dark.xml
index 76e9d33..5b26813 100644
--- a/java/res/values/themes-lxx-dark.xml
+++ b/java/res/values/themes-lxx-dark.xml
@@ -114,6 +114,7 @@
         <item name="android:background">@android:color/transparent</item>
         <item name="keyBackground">@drawable/btn_keyboard_key_popup_action_lxx_dark</item>
         <item name="divider">@null</item>
+        <item name="keyLabelFlags">keepBackgroundAspectRatio</item>
     </style>
     <style
         name="SuggestionStripView.LXX_Dark"
diff --git a/java/res/values/themes-lxx-light.xml b/java/res/values/themes-lxx-light.xml
index 5cd8417..f607807 100644
--- a/java/res/values/themes-lxx-light.xml
+++ b/java/res/values/themes-lxx-light.xml
@@ -114,6 +114,7 @@
         <item name="android:background">@android:color/transparent</item>
         <item name="keyBackground">@drawable/btn_keyboard_key_popup_action_lxx_light</item>
         <item name="divider">@null</item>
+        <item name="keyLabelFlags">keepBackgroundAspectRatio</item>
     </style>
     <style
         name="SuggestionStripView.LXX_Light"
diff --git a/java/res/xml-sw600dp/key_styles_enter.xml b/java/res/xml-sw600dp/key_styles_enter.xml
index d066d2d..63ef2f8 100644
--- a/java/res/xml-sw600dp/key_styles_enter.xml
+++ b/java/res/xml-sw600dp/key_styles_enter.xml
@@ -80,13 +80,27 @@
         </default>
     </switch>
     <!-- Enter key style -->
-    <key-style
-        latin:styleName="defaultEnterKeyStyle"
-        latin:keySpec="!icon/enter_key|!code/key_enter"
-        latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
-        latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="action"
-        latin:parentStyle="navigateMoreKeysStyle" />
+    <switch>
+        <case latin:keyboardTheme="ICS|KLP">
+            <key-style
+                latin:styleName="defaultEnterKeyStyle"
+                latin:keySpec="!icon/enter_key|!code/key_enter"
+                latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action"
+                latin:parentStyle="navigateMoreKeysStyle" />
+        </case>
+        <!-- keyboardTheme="LXXLight|LXXDark" -->
+        <default>
+            <key-style
+                latin:styleName="defaultEnterKeyStyle"
+                latin:keySpec="!icon/enter_key|!code/key_enter"
+                latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor|keepBackgroundAspectRatio"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action"
+                latin:parentStyle="navigateMoreKeysStyle" />
+        </default>
+    </switch>
     <include latin:keyboardLayout="@xml/key_styles_actions" />
     <switch>
         <!-- Shift + Enter in textMultiLine field. -->
diff --git a/java/res/xml/key_styles_common.xml b/java/res/xml/key_styles_common.xml
index 43ee26b..b36ddf2 100644
--- a/java/res/xml/key_styles_common.xml
+++ b/java/res/xml/key_styles_common.xml
@@ -80,11 +80,24 @@
         latin:keyActionFlags="isRepeatable|noKeyPreview"
         latin:backgroundType="functional" />
     <!-- emojiKeyStyle must be defined before including @xml/key_syles_enter. -->
-    <key-style
-        latin:styleName="emojiKeyStyle"
-        latin:keySpec="!icon/emoji_action_key|!code/key_emoji"
-        latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="action" />
+    <switch>
+        <case latin:keyboardTheme="ICS|KLP">
+            <key-style
+                latin:styleName="emojiKeyStyle"
+                latin:keySpec="!icon/emoji_action_key|!code/key_emoji"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action" />
+        </case>
+        <!-- keyboardTheme="LXXLight|LXXDark" -->
+        <default>
+            <key-style
+                latin:styleName="emojiKeyStyle"
+                latin:keySpec="!icon/emoji_action_key|!code/key_emoji"
+                latin:keyLabelFlags="keepBackgroundAspectRatio"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action" />
+        </default>
+    </switch>
     <include
         latin:keyboardLayout="@xml/key_styles_enter" />
     <!-- TODO: Currently there is no way to specify icon alignment per theme. -->
diff --git a/java/res/xml/key_styles_enter.xml b/java/res/xml/key_styles_enter.xml
index d6d01b8..564f465 100644
--- a/java/res/xml/key_styles_enter.xml
+++ b/java/res/xml/key_styles_enter.xml
@@ -212,13 +212,27 @@
         </default>
     </switch>
     <!-- Enter key style -->
-    <key-style
-        latin:styleName="defaultEnterKeyStyle"
-        latin:keySpec="!icon/enter_key|!code/key_enter"
-        latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
-        latin:keyActionFlags="noKeyPreview"
-        latin:backgroundType="action"
-        latin:parentStyle="navigateMoreKeysStyle" />
+    <switch>
+        <case latin:keyboardTheme="ICS|KLP">
+            <key-style
+                latin:styleName="defaultEnterKeyStyle"
+                latin:keySpec="!icon/enter_key|!code/key_enter"
+                latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action"
+                latin:parentStyle="navigateMoreKeysStyle" />
+        </case>
+        <!-- keyboardTheme="LXXLight|LXXDark" -->
+        <default>
+            <key-style
+                latin:styleName="defaultEnterKeyStyle"
+                latin:keySpec="!icon/enter_key|!code/key_enter"
+                latin:keyLabelFlags="preserveCase|autoXScale|followKeyLabelRatio|followFunctionalTextColor|keepBackgroundAspectRatio"
+                latin:keyActionFlags="noKeyPreview"
+                latin:backgroundType="action"
+                latin:parentStyle="navigateMoreKeysStyle" />
+        </default>
+    </switch>
     <include latin:keyboardLayout="@xml/key_styles_actions" />
     <switch>
         <!-- Shift + Enter in textMultiLine field. -->
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index 8548544..86ea4c5 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -87,6 +87,7 @@
     private static final int LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED = 0x20000;
     private static final int LABEL_FLAGS_FROM_CUSTOM_ACTION_LABEL = 0x40000;
     private static final int LABEL_FLAGS_FOLLOW_FUNCTIONAL_TEXT_COLOR = 0x80000;
+    private static final int LABEL_FLAGS_KEEP_BACKGROUND_ASPECT_RATIO = 0x100000;
     private static final int LABEL_FLAGS_DISABLE_HINT_LABEL = 0x40000000;
     private static final int LABEL_FLAGS_DISABLE_ADDITIONAL_MORE_KEYS = 0x80000000;
 
@@ -697,6 +698,10 @@
         return (mLabelFlags & LABEL_FLAGS_AUTO_SCALE) == LABEL_FLAGS_AUTO_SCALE;
     }
 
+    public final boolean needsToKeepBackgroundAspectRatio(final int defaultFlags) {
+        return ((mLabelFlags | defaultFlags) & LABEL_FLAGS_KEEP_BACKGROUND_ASPECT_RATIO) != 0;
+    }
+
     private final boolean isShiftedLetterActivated() {
         return (mLabelFlags & LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED) != 0
                 && !TextUtils.isEmpty(mHintLabel);
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index 075cd90..bb3cbb0 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -340,11 +340,25 @@
     // Draw key background.
     protected void onDrawKeyBackground(final Key key, final Canvas canvas,
             final Drawable background) {
-        final Rect padding = mKeyBackgroundPadding;
-        final int bgWidth = key.getDrawWidth() + padding.left + padding.right;
-        final int bgHeight = key.getHeight() + padding.top + padding.bottom;
-        final int bgX = -padding.left;
-        final int bgY = -padding.top;
+        final int keyWidth = key.getDrawWidth();
+        final int keyHeight = key.getHeight();
+        final int bgWidth, bgHeight, bgX, bgY;
+        if (key.needsToKeepBackgroundAspectRatio(mDefaultKeyLabelFlags)) {
+            final int intrinsicWidth = background.getIntrinsicWidth();
+            final int intrinsicHeight = background.getIntrinsicHeight();
+            final float minScale = Math.min(
+                    keyWidth / (float)intrinsicWidth, keyHeight / (float)intrinsicHeight);
+            bgWidth = (int)(intrinsicWidth * minScale);
+            bgHeight = (int)(intrinsicHeight * minScale);
+            bgX = (keyWidth - bgWidth) / 2;
+            bgY = (keyHeight - bgHeight) / 2;
+        } else {
+            final Rect padding = mKeyBackgroundPadding;
+            bgWidth = keyWidth + padding.left + padding.right;
+            bgHeight = keyHeight + padding.top + padding.bottom;
+            bgX = -padding.left;
+            bgY = -padding.top;
+        }
         final Rect bounds = background.getBounds();
         if (bgWidth != bounds.right || bgHeight != bounds.bottom) {
             background.setBounds(0, 0, bgWidth, bgHeight);
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
index 73c84cd..abcfff8 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
@@ -308,8 +308,8 @@
                 dividerWidth = 0;
             }
             final MoreKeySpec[] moreKeys = key.getMoreKeys();
-            mParams.setParameters(moreKeys.length, key.getMoreKeysColumnNumber(), keyWidth, rowHeight,
-                    key.getX() + key.getWidth() / 2, keyboard.mId.mWidth,
+            mParams.setParameters(moreKeys.length, key.getMoreKeysColumnNumber(), keyWidth,
+                    rowHeight, key.getX() + key.getWidth() / 2, keyboard.mId.mWidth,
                     key.isMoreKeysFixedColumn(), key.isMoreKeysFixedOrder(), dividerWidth);
         }