Fix anti aliasing rounded background

Reviewed By: shergin, achen1

Differential Revision: D7569885

fbshipit-source-id: 4bfb00485211417b475f14a92fd7b2e52a4b2ff6

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewBackgroundDrawable.java

@@ -343,6 +343,23 @@ public class ReactViewBackgroundDrawable extends Drawable {
         || borderWidth.bottom > 0
         || borderWidth.left > 0
         || borderWidth.right > 0) {
+
+      //If it's a full and even border draw inner rect path with stroke
+      final float fullBorderWidth = getFullBorderWidth();
+      if (borderWidth.top == fullBorderWidth &&
+        borderWidth.bottom == fullBorderWidth &&
+        borderWidth.left == fullBorderWidth &&
+        borderWidth.right == fullBorderWidth) {
+        if (fullBorderWidth > 0) {
+          int borderColor = getBorderColor(Spacing.ALL);
+          mPaint.setColor(ColorUtil.multiplyColorAlpha(borderColor, mAlpha));
+          mPaint.setStyle(Paint.Style.STROKE);
+          mPaint.setStrokeWidth(fullBorderWidth);
+          canvas.drawPath(mInnerClipPathForBorderRadius, mPaint);
+        }
+      }
+      //In the case of uneven border widths/colors draw quadrilateral in each direction
+      else {
         mPaint.setStyle(Paint.Style.FILL);
 
         // Draw border
@@ -379,8 +396,10 @@ public class ReactViewBackgroundDrawable extends Drawable {
 
             final boolean isColorStartDefined = isBorderColorDefined(Spacing.START);
             final boolean isColorEndDefined = isBorderColorDefined(Spacing.END);
-          final boolean isDirectionAwareColorLeftDefined = isRTL ? isColorEndDefined : isColorStartDefined;
+            final boolean isDirectionAwareColorLeftDefined =
-          final boolean isDirectionAwareColorRightDefined = isRTL ? isColorStartDefined : isColorEndDefined;
+              isRTL ? isColorEndDefined : isColorStartDefined;
+            final boolean isDirectionAwareColorRightDefined =
+              isRTL ? isColorStartDefined : isColorEndDefined;
 
             if (isDirectionAwareColorLeftDefined) {
               colorLeft = directionAwareColorLeft;
@@ -449,7 +468,7 @@ public class ReactViewBackgroundDrawable extends Drawable {
           drawQuadrilateral(canvas, colorBottom, x1, y1, x2, y2, x3, y3, x4, y4);
         }
       }
-
+    }
     canvas.restore();
   }