From dc5ef8425ba63b0901ed08017be43f749573cdec Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Thu, 15 Feb 2007 18:12:29 +0000
Subject: Introduced V12_X_SHIFT / V12_Y_SHIFT

svn-id: r25611
---
 engines/scumm/actor.cpp  | 26 +++++++++++++-------------
 engines/scumm/actor.h    |  5 ++++-
 engines/scumm/object.cpp |  4 ++--
 engines/scumm/scumm.cpp  |  6 +++---
 4 files changed, 22 insertions(+), 19 deletions(-)

(limited to 'engines/scumm')

diff --git a/engines/scumm/actor.cpp b/engines/scumm/actor.cpp
index fccd07106d..295bb1b036 100644
--- a/engines/scumm/actor.cpp
+++ b/engines/scumm/actor.cpp
@@ -2368,27 +2368,27 @@ void Actor::saveLoadWithSerializer(Serializer *ser) {
 	ser->saveLoadEntries(this, actorEntries);
 	
 	if (ser->isLoading() && _vm->_game.version <= 2 && ser->getVersion() < VER(70)) {
-		_pos.x /= V12_X_MULTIPLIER;
-		_pos.y /= V12_Y_MULTIPLIER;
+		_pos.x >>= V12_X_SHIFT;
+		_pos.y >>= V12_Y_SHIFT;
 
-		_speedx /= V12_X_MULTIPLIER;
-		_speedy /= V12_Y_MULTIPLIER;
-		_elevation /= V12_Y_MULTIPLIER;
+		_speedx >>= V12_X_SHIFT;
+		_speedy >>= V12_Y_SHIFT;
+		_elevation >>= V12_Y_SHIFT;
 
 		if (_walkdata.dest.x != -1) {
-			_walkdata.dest.x /= V12_X_MULTIPLIER;
-			_walkdata.dest.y /= V12_Y_MULTIPLIER;
+			_walkdata.dest.x >>= V12_X_SHIFT;
+			_walkdata.dest.y >>= V12_Y_SHIFT;
 		}
 
-		_walkdata.cur.x /= V12_X_MULTIPLIER;
-		_walkdata.cur.y /= V12_Y_MULTIPLIER;
+		_walkdata.cur.x >>= V12_X_SHIFT;
+		_walkdata.cur.y >>= V12_Y_SHIFT;
 
-		_walkdata.next.x /= V12_X_MULTIPLIER;
-		_walkdata.next.y /= V12_Y_MULTIPLIER;
+		_walkdata.next.x >>= V12_X_SHIFT;
+		_walkdata.next.y >>= V12_Y_SHIFT;
 
 		if (_walkdata.point3.x != 32000) {
-			_walkdata.point3.x /= V12_X_MULTIPLIER;
-			_walkdata.point3.y /= V12_Y_MULTIPLIER;
+			_walkdata.point3.x >>= V12_X_SHIFT;
+			_walkdata.point3.y >>= V12_Y_SHIFT;
 		}
 	}
 }
diff --git a/engines/scumm/actor.h b/engines/scumm/actor.h
index f590f61e11..31200f6296 100644
--- a/engines/scumm/actor.h
+++ b/engines/scumm/actor.h
@@ -35,7 +35,10 @@ namespace Scumm {
 
 enum {
 	V12_X_MULTIPLIER = 8,
-	V12_Y_MULTIPLIER = 2
+	V12_Y_MULTIPLIER = 2,
+
+	V12_X_SHIFT = 3,
+	V12_Y_SHIFT = 1
 };
 
 enum MoveFlags {
diff --git a/engines/scumm/object.cpp b/engines/scumm/object.cpp
index b3c3b9cb8a..783cbdea6b 100644
--- a/engines/scumm/object.cpp
+++ b/engines/scumm/object.cpp
@@ -413,8 +413,8 @@ void ScummEngine::getObjectXYPos(int object, int &x, int &y, int &dir) {
 			y = od.y_pos + (int16)READ_LE_UINT16(&imhd->old.hotspot[state].y);
 		}
 	} else if (_game.version <= 2) {
-		x = od.walk_x / V12_X_MULTIPLIER;
-		y = od.walk_y / V12_Y_MULTIPLIER;
+		x = od.walk_x >> V12_X_SHIFT;
+		y = od.walk_y >> V12_Y_SHIFT;
 	} else {
 		x = od.walk_x;
 		y = od.walk_y;
diff --git a/engines/scumm/scumm.cpp b/engines/scumm/scumm.cpp
index c25603c48d..c3e7d9ef45 100644
--- a/engines/scumm/scumm.cpp
+++ b/engines/scumm/scumm.cpp
@@ -1917,7 +1917,7 @@ void ScummEngine::scummLoop_updateScummVars() {
 		VAR(VAR_CAMERA_POS_X) = camera._cur.x;
 		VAR(VAR_CAMERA_POS_Y) = camera._cur.y;
 	} else if (_game.version <= 2) {
-		VAR(VAR_CAMERA_POS_X) = camera._cur.x / V12_X_MULTIPLIER;
+		VAR(VAR_CAMERA_POS_X) = camera._cur.x >> V12_X_SHIFT;
 	} else {
 		VAR(VAR_CAMERA_POS_X) = camera._cur.x;
 	}
@@ -1937,8 +1937,8 @@ void ScummEngine::scummLoop_updateScummVars() {
 		// We use shifts below instead of dividing by V12_X_MULTIPLIER resp.
 		// V12_Y_MULTIPLIER to handle negative coordinates correctly.
 		// This fixes e.g. bugs #1328131 and #1537595.
-		VAR(VAR_VIRT_MOUSE_X) = _virtualMouse.x >> 3;	// V12_X_MULTIPLIER
-		VAR(VAR_VIRT_MOUSE_Y) = _virtualMouse.y >> 1;	// V12_X_MULTIPLIER
+		VAR(VAR_VIRT_MOUSE_X) = _virtualMouse.x >> V12_X_SHIFT;
+		VAR(VAR_VIRT_MOUSE_Y) = _virtualMouse.y >> V12_Y_SHIFT;
 
 		// Adjust mouse coordinates as narrow rooms in NES are centered
 		if (_game.platform == Common::kPlatformNES && _NESStartStrip > 0) {
-- 
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