Port visible bell to Android

* java/org/gnu/emacs/EmacsDrawRectangle.java (perform): Ignore
GC_INVERT.

* java/org/gnu/emacs/EmacsFillRectangle.java
(EmacsFillRectangle) <invertFilter>: New variable.
(perform): If the transfer mode is invert, copy the source
to itself with invertFilter as the color filter.

* java/org/gnu/emacs/EmacsGC.java (EmacsGC) <xorAlu, srcInAlu>:
Delete now-redundant ALUs.
(markDirty): Cease updating the paint's transfermode.

* java/org/gnu/emacs/EmacsSafThread.java (openDocument1): Fix
typo in documentation.

* src/android.c (android_blit_xor): Delete unused function.
(android_copy_area): Remove calls to unused blit functions.

* src/androidgui.h (enum android_gc_function): Rename XOR to
INVERT.

* src/androidterm.c (android_flash): Replace with GXinvert.

1 files changed, 2 insertions, 8 deletions

diff --git a/src/androidterm.c b/src/androidterm.c
index f849f0d9919..2979e5c1401 100644
--- a/src/androidterm.c
+++ b/src/androidterm.c
@@ -151,14 +151,8 @@ android_flash (struct frame *f)
   fd_set fds;
 
   block_input ();
-
-  values.function = ANDROID_GC_XOR;
-  values.foreground = (FRAME_FOREGROUND_PIXEL (f)
-                       ^ FRAME_BACKGROUND_PIXEL (f));
-
-  gc = android_create_gc ((ANDROID_GC_FUNCTION
-                           | ANDROID_GC_FOREGROUND),
-                          &values);
+  values.function = ANDROID_GC_INVERT;
+  gc = android_create_gc (ANDROID_GC_FUNCTION, &values);
 
   /* Get the height not including a menu bar widget.  */
   int height = FRAME_PIXEL_HEIGHT (f);