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- Fix overflows in AM_clipMline().

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SVN r3182 (trunk)
This commit is contained in:
Randy Heit 2011-04-17 03:43:42 +00:00
parent 37b7595db7
commit ef69e2bbf0
1 changed files with 4 additions and 4 deletions
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8
src/am_map.cpp
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@ -1461,28 +1461,28 @@ bool AM_clipMline (mline_t *ml, fline_t *fl)
{ {
dy = fl->a.y - fl->b.y; dy = fl->a.y - fl->b.y;
dx = fl->b.x - fl->a.x; dx = fl->b.x - fl->a.x;
tmp.x = fl->a.x + (dx*(fl->a.y))/dy; tmp.x = fl->a.x + Scale(dx, fl->a.y, dy);
tmp.y = 0; tmp.y = 0;
} }
else if (outside & BOTTOM) else if (outside & BOTTOM)
{ {
dy = fl->a.y - fl->b.y; dy = fl->a.y - fl->b.y;
dx = fl->b.x - fl->a.x; dx = fl->b.x - fl->a.x;
tmp.x = fl->a.x + (dx*(fl->a.y-f_h))/dy; tmp.x = fl->a.x + Scale(dx, fl->a.y - f_h, dy);
tmp.y = f_h-1; tmp.y = f_h-1;
} }
else if (outside & RIGHT) else if (outside & RIGHT)
{ {
dy = fl->b.y - fl->a.y; dy = fl->b.y - fl->a.y;
dx = fl->b.x - fl->a.x; dx = fl->b.x - fl->a.x;
tmp.y = fl->a.y + (dy*(f_w-1 - fl->a.x))/dx; tmp.y = fl->a.y + Scale(dy, f_w-1 - fl->a.x, dx);
tmp.x = f_w-1; tmp.x = f_w-1;
} }
else if (outside & LEFT) else if (outside & LEFT)
{ {
dy = fl->b.y - fl->a.y; dy = fl->b.y - fl->a.y;
dx = fl->b.x - fl->a.x; dx = fl->b.x - fl->a.x;
tmp.y = fl->a.y + (dy*(-fl->a.x))/dx; tmp.y = fl->a.y + Scale(dy, -fl->a.x, dx);
tmp.x = 0; tmp.x = 0;
} }