Do not show animation for image has no valid rect

app/src/main/java/com/hippo/ehviewer/gallery/gl/GalleryPageView.java

@@ -121,7 +121,8 @@ public class GalleryPageView extends GLFrameLayout {
     }
 
     public void showInfo() {
-        mImage.setVisibility(GONE);
+        // For image valid rect
+        mImage.setVisibility(INVISIBLE);
         mInfo.setVisibility(VISIBLE);
     }
 

app/src/main/java/com/hippo/ehviewer/gallery/gl/ImageView.java

@@ -222,8 +222,9 @@ public class ImageView extends GLView implements ImageTexture.Callback {
                 mTextureHeight = 1;
             }
 
-            // Start alpha animation
-            if (isAttachedToRoot()) {
+            // Start alpha animation, do not show animation for image has no valid rect
+            getValidRect(mValidRect);
+            if (!mValidRect.isEmpty()) {
                 startAnimation(mAlphaAnimation, true);
             }
         } else {