libretro/scummvm
1
0
Fork 0
mirror of https://github.com/libretro/scummvm.git synced 2024-12-29 05:03:29 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

SCUMM: Fix UB shifting negative integers in Actor

Browse Source
This commit is contained in:
Colin Snover 2017-11-29 19:36:28 -06:00
parent 1871c7dfea
commit 57084b4a1b
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
engines/scumm/actor.cpp
View File

@ -565,13 +565,13 @@ int Actor::actorWalkStep() {
_pos.y -= 1;
}
} else {
tmpX = (_pos.x << 16) + _walkdata.xfrac + (_walkdata.deltaXFactor >> 8) * _scalex;
tmpX = (_pos.x * (1 << 16)) + _walkdata.xfrac + (_walkdata.deltaXFactor / 256) * _scalex;
_walkdata.xfrac = (uint16)tmpX;
_pos.x = (tmpX >> 16);
_pos.x = (tmpX / (1 << 16));
tmpY = (_pos.y << 16) + _walkdata.yfrac + (_walkdata.deltaYFactor >> 8) * _scaley;
tmpY = (_pos.y * (1 << 16)) + _walkdata.yfrac + (_walkdata.deltaYFactor / 256) * _scaley;
_walkdata.yfrac = (uint16)tmpY;
_pos.y = (tmpY >> 16);
_pos.y = (tmpY / (1 << 16));
}
if (ABS(_pos.x - _walkdata.cur.x) > distX) {