From 0beb259278dfd18757bf9484a6123edf4b44864e Mon Sep 17 00:00:00 2001
From: Colin Snover
Date: Sat, 22 Jul 2017 15:54:05 -0500
Subject: SCI32: Improve performance when flushing events during video playback

Calling through EventManager::getSciEvent to flush events is
pretty inefficient and created stalls that lead to dropped
frames during the chapter 7 chase in Phantasmagoria 1.

If necessary, performance could be improved further by extending
Common::EventManager to expose SDL_FlushEvents, but this seems to
finish in 0-1ms so should be OK for now.

Refs Trac#9974, Trac#9975.
---
 engines/sci/event.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'engines/sci/event.cpp')

diff --git a/engines/sci/event.cpp b/engines/sci/event.cpp
index 873b6bb48a..b1be46aded 100644
--- a/engines/sci/event.cpp
+++ b/engines/sci/event.cpp
@@ -408,6 +408,13 @@ SciEvent EventManager::getSciEvent(uint32 mask) {
 	return event;
 }
 
+void EventManager::flushEvents() {
+	Common::EventManager *em = g_system->getEventManager();
+	Common::Event event;
+	while (em->pollEvent(event));
+	_events.clear();
+}
+
 #ifdef ENABLE_SCI32
 void EventManager::setHotRectanglesActive(const bool active) {
 	_hotRectanglesActive = active;
-- 
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