avoid calculate shadow when elevation is 0

Test: N/A
Bug: 37906145
Change-Id: Ib8dc3f781767271388eb3e6f886267e9d98d67f8

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java b/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java
index 8ae212cd2ebf..aed85a746c20 100644
--- a/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java
+++ b/tools/layoutlib/bridge/src/android/view/RectShadowPainter.java
@@ -41,6 +41,11 @@ public class RectShadowPainter {
             return;
         }
 
+        if (elevation <= 0) {
+            // If elevation is 0, we don't need to paint the shadow
+            return;
+        }
+
         Rect originCanvasRect = canvas.getClipBounds();
         int saved = modifyCanvas(canvas);
         if (saved == -1) {