Adjust cropping of current wallpaper preview for RTL

When in RTL, the current wallpaper is centered on the rightmost side
of the image when using static wallpapers. Make sure the preview follows
this same behavior.

Bug: 175610692

Change-Id: I8662375bbd8224b2b882a34939f7d11d67205a7d
diff --git a/src/com/android/wallpaper/picker/ImagePreviewFragment.java b/src/com/android/wallpaper/picker/ImagePreviewFragment.java
index 1ea49f0..3fd8f51 100755
--- a/src/com/android/wallpaper/picker/ImagePreviewFragment.java
+++ b/src/com/android/wallpaper/picker/ImagePreviewFragment.java
@@ -374,18 +374,23 @@
      * <p>This method is called once in the Fragment lifecycle after the wallpaper asset has loaded
      * and rendered to the layout.
      *
-     * @param offsetToFarLeft {@code true} if we want to offset the visible rectangle to far left of
-     *                                    the raw wallpaper; {@code false} otherwise.
+     * @param offsetToStart {@code true} if we want to offset the visible rectangle to the start
+     *                                  side of the raw wallpaper; {@code false} otherwise.
      */
-    private void setDefaultWallpaperZoomAndScroll(boolean offsetToFarLeft) {
+    private void setDefaultWallpaperZoomAndScroll(boolean offsetToStart) {
         // Determine minimum zoom to fit maximum visible area of wallpaper on crop surface.
         int cropWidth = mWallpaperSurface.getMeasuredWidth();
         int cropHeight = mWallpaperSurface.getMeasuredHeight();
         Point crop = new Point(cropWidth, cropHeight);
         Rect visibleRawWallpaperRect =
                 WallpaperCropUtils.calculateVisibleRect(mRawWallpaperSize, crop);
-        if (offsetToFarLeft) {
-            visibleRawWallpaperRect.offsetTo(/* newLeft= */ 0, visibleRawWallpaperRect.top);
+        if (offsetToStart) {
+            if (WallpaperCropUtils.isRtl(requireContext())) {
+                visibleRawWallpaperRect.offsetTo(mRawWallpaperSize.x
+                                - visibleRawWallpaperRect.width(), visibleRawWallpaperRect.top);
+            } else {
+                visibleRawWallpaperRect.offsetTo(/* newLeft= */ 0, visibleRawWallpaperRect.top);
+            }
         }
 
         final PointF centerPosition = new PointF(visibleRawWallpaperRect.centerX(),