From 0be12e05b22b62a1800046874933a1532ae0f363 Mon Sep 17 00:00:00 2001
From: ennewalker <ennewalker@c06c8d41-db1a-0410-9941-cceddc491573>
Date: Sun, 29 Mar 2009 20:46:47 +0000
Subject: Tiles performance improvements to eliminate mouse lag on slower
 systems.  It should redraw the screen far less frequently.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9568 c06c8d41-db1a-0410-9941-cceddc491573
---
 crawl-ref/source/tilesdl.cc | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/crawl-ref/source/tilesdl.cc b/crawl-ref/source/tilesdl.cc
index 1eebc00ec8..9db08291c6 100644
--- a/crawl-ref/source/tilesdl.cc
+++ b/crawl-ref/source/tilesdl.cc
@@ -709,6 +709,10 @@ struct cursor_loc
                 && rhs.cy == cy
                 && reg);
     }
+    bool operator!=(const cursor_loc &rhs) const
+    {
+        return !(*this == rhs);
+    }
 
     Region *reg;
     int cx, cy;
@@ -721,10 +725,11 @@ int TilesFramework::getch_ck()
     SDL_Event event;
     cursor_loc cur_loc;
     cursor_loc tip_loc;
+    cursor_loc last_loc;
 
     int key = 0;
 
-    const unsigned int ticks_per_redraw = 16; // 60 FPS = 16.6 ms/frame
+    const unsigned int ticks_per_redraw = 50;
     unsigned int last_redraw_tick = 0;
 
     unsigned int res = std::max(30, Options.tile_tooltip_ms);
@@ -744,6 +749,8 @@ int TilesFramework::getch_ck()
         {
             ticks = SDL_GetTicks();
 
+            last_loc = cur_loc;
+
             if (event.type != SDL_USEREVENT)
             {
                 tiles.clear_text_tags(TAG_CELL_DESC);
@@ -871,15 +878,19 @@ int TilesFramework::getch_ck()
                     if (reg->update_tip_text(m_tooltip))
                         break;
                 }
+                m_need_redraw = true;
             }
         }
         else
         {
+            if (last_loc != cur_loc)
+                m_need_redraw = true;
+
             m_tooltip.clear();
             tip_loc.reset();
         }
 
-        if (ticks - last_redraw_tick > ticks_per_redraw)
+        if ((ticks - last_redraw_tick > ticks_per_redraw) && need_redraw())
         {
             redraw();
             last_redraw_tick = ticks;
-- 
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