From a1fabab3e5db1baab46a95a318b27fdf33d470cc Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Tue, 29 Nov 2016 20:40:02 +0100
Subject: [PATCH] changed event filter to not set as SDL event filter, but call
 it manually

---
 src/events.c         | 28 ++++++++++------------------
 src/events.h         |  6 ------
 src/init.c           |  2 --
 src/libgame/system.c | 10 ----------
 src/libgame/system.h |  9 ---------
 5 files changed, 10 insertions(+), 45 deletions(-)

diff --git a/src/events.c b/src/events.c
index 79821e98..d19ff880 100644
--- a/src/events.c
+++ b/src/events.c
@@ -46,7 +46,7 @@ static unsigned int special_cursor_delay_value = 1000;
 /* event filter addition for SDL2: as SDL2 does not have a function to enable
    or disable keyboard auto-repeat, filter repeated keyboard events instead */
 
-static int FilterEventsExt(const Event *event)
+static int FilterEvents(const Event *event)
 {
   MotionEvent *motion;
 
@@ -88,23 +88,11 @@ static int FilterEventsExt(const Event *event)
   return 1;
 }
 
-#if defined(TARGET_SDL2)
-int FilterEvents(void *userdata, Event *event)
-{
-  return FilterEventsExt(event);
-}
-#else
-int FilterEvents(const Event *event)
-{
-  return FilterEventsExt(event);
-}
-#endif
-
 /* to prevent delay problems, skip mouse motion events if the very next
    event is also a mouse motion event (and therefore effectively only
    handling the last of a row of mouse motion events in the event queue) */
 
-boolean SkipPressedMouseMotionEvent(const Event *event)
+static boolean SkipPressedMouseMotionEvent(const Event *event)
 {
   /* nothing to do if the current event is not a mouse motion event */
   if (event->type != EVENT_MOTIONNOTIFY)
@@ -128,9 +116,13 @@ boolean SkipPressedMouseMotionEvent(const Event *event)
   return FALSE;
 }
 
-/* this is only really needed for non-SDL targets to filter unwanted events;
-   when using SDL with properly installed event filter, this function can be
-   replaced with a simple "NextEvent()" call, but it doesn't hurt either */
+/* this is especially needed for event modifications for the Android target:
+   if mouse coordinates should be modified in the event filter function,
+   using a properly installed SDL event filter does not work, because in
+   the event filter, mouse coordinates in the event structure are still
+   physical pixel positions, not logical (scaled) screen positions, so this
+   has to be handled at a later stage in the event processing functions
+   (when device pixel positions are already converted to screen positions) */
 
 boolean NextValidEvent(Event *event)
 {
@@ -140,7 +132,7 @@ boolean NextValidEvent(Event *event)
 
     NextEvent(event);
 
-    if (FilterEventsExt(event))
+    if (FilterEvents(event))
       handle_this_event = TRUE;
 
     if (SkipPressedMouseMotionEvent(event))
diff --git a/src/events.h b/src/events.h
index a809665c..e5d2dcc3 100644
--- a/src/events.h
+++ b/src/events.h
@@ -14,12 +14,6 @@
 
 #include "main.h"
 
-#if defined(TARGET_SDL2)
-int FilterEvents(void *, Event *);
-#else
-int FilterEvents(const Event *);
-#endif
-
 boolean NextValidEvent(Event *);
 
 void EventLoop(void);
diff --git a/src/init.c b/src/init.c
index 28dcd41c..8595288c 100644
--- a/src/init.c
+++ b/src/init.c
@@ -5926,8 +5926,6 @@ void OpenAll()
   InitVideoDisplay();
   InitVideoBuffer(WIN_XSIZE, WIN_YSIZE, DEFAULT_DEPTH, setup.fullscreen);
 
-  InitEventFilter(FilterEvents);
-
   print_timestamp_time("[init video stuff]");
 
   InitElementPropertiesStatic();
diff --git a/src/libgame/system.c b/src/libgame/system.c
index 7d85f617..222b6f60 100644
--- a/src/libgame/system.c
+++ b/src/libgame/system.c
@@ -1401,16 +1401,6 @@ void SetAudioMode(boolean enabled)
 /* event functions                                                           */
 /* ========================================================================= */
 
-void InitEventFilter(EventFilter filter_function)
-{
-  /* set event filter to filter out certain events */
-#if defined(TARGET_SDL2)
-  SDL_SetEventFilter(filter_function, NULL);
-#else
-  SDL_SetEventFilter(filter_function);
-#endif
-}
-
 boolean PendingEvent(void)
 {
   return (SDL_PollEvent(NULL) ? TRUE : FALSE);
diff --git a/src/libgame/system.h b/src/libgame/system.h
index 64101094..a11c6b8e 100644
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -723,14 +723,6 @@
 }
 
 
-/* type definitions */
-#if defined(TARGET_SDL2)
-typedef int (*EventFilter)(void *, Event *);
-#else
-typedef int (*EventFilter)(const Event *);
-#endif
-
-
 /* structure definitions */
 
 struct ProgramInfo
@@ -1494,7 +1486,6 @@ void OpenAudio(void);
 void CloseAudio(void);
 void SetAudioMode(boolean);
 
-void InitEventFilter(EventFilter);
 boolean PendingEvent(void);
 void NextEvent(Event *event);
 void PeekEvent(Event *event);
-- 
2.34.1