Fix crash that happens with shadow color with 0 alpha (#46551)

Summary:
Pull Request resolved: #46551

We crash if we pass a shadow color with 0 alpha due to some divide by 0 logic. This fixes that for inset and outset shadows and adds a test for that case.

Changelog: [Internal]

Differential Revision: D62899047

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/drawable/InsetBoxShadowDrawable.kt

@@ -84,8 +84,10 @@ internal class InsetBoxShadowDrawable(
     invalidateSelf()
   }
 
-  override fun getOpacity(): Int =
-      ((shadowPaint.alpha / 255f) / (Color.alpha(shadowColor) / 255f) * 255f).roundToInt()
+  override fun getOpacity(): Int {
+    val alpha = Color.alpha(shadowColor)
+    return if (alpha == 0) 0 else ((shadowPaint.alpha / 255f) / (alpha / 255f) * 255f).roundToInt()
+  }
 
   override fun draw(canvas: Canvas) {
     val computedBorderRadii = computeBorderRadii()

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/drawable/OutsetBoxShadowDrawable.kt

@@ -72,8 +72,10 @@ internal class OutsetBoxShadowDrawable(
     invalidateSelf()
   }
 
-  override fun getOpacity(): Int =
-      ((shadowPaint.alpha / 255f) / (Color.alpha(shadowColor) / 255f) * 255f).roundToInt()
+  override fun getOpacity(): Int {
+    val alpha = Color.alpha(shadowColor)
+    return if (alpha == 0) 0 else ((shadowPaint.alpha / 255f) / (alpha / 255f) * 255f).roundToInt()
+  }
 
   override fun draw(canvas: Canvas) {
     val resolutionWidth = bounds.width().toFloat().pxToDp()

packages/rn-tester/js/examples/View/ViewExample.js

@@ -528,6 +528,13 @@ function BoxShadowExample(): React.Node {
             boxShadow: '0px 10px',
           }}
         />
+        <View
+          style={{
+            ...defaultStyleSize,
+            backgroundColor: 'orange',
+            boxShadow: '5px 5px 5px 0px rgba(0, 0, 0, 0)',
+          }}
+        />
       </View>
     </View>
   );