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Save some perf.

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This commit is contained in:
Paul Chote
2010-11-26 21:13:36 +13:00
parent 3b0810a096
commit e91caa4e7a
2 changed files with 17 additions and 6 deletions
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18
OpenRA.Game/Graphics/Viewport.cs
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@@ -138,14 +138,22 @@ namespace OpenRA.Graphics
return new Rectangle(left, top, right - left, bottom - top);
}
int2 cachedScroll = new int2(int.MaxValue, int.MaxValue);
Rectangle cachedRect;
public Rectangle WorldBounds(World world)
{
int2 boundary = new int2(1,1); // Add a curtain of cells around the viewport to account for rounding errors
var tl = ViewToWorld(int2.Zero).ToInt2() - boundary;
var br = ViewToWorld(new int2(Width, Height)).ToInt2() + boundary;
var view = Rectangle.Intersect(Rectangle.FromLTRB(tl.X, tl.Y, br.X, br.Y), world.Map.Bounds);
if (cachedScroll != scrollPosition)
{
int2 boundary = new int2(1,1); // Add a curtain of cells around the viewport to account for rounding errors
var tl = ViewToWorld(int2.Zero).ToInt2() - boundary;
var br = ViewToWorld(new int2(Width, Height)).ToInt2() + boundary;
cachedRect = Rectangle.Intersect(Rectangle.FromLTRB(tl.X, tl.Y, br.X, br.Y), world.Map.Bounds);
cachedScroll = scrollPosition;
}
var b = world.LocalShroud.Bounds;
return (b.HasValue) ? Rectangle.Intersect(view, b.Value) : view;
return (b.HasValue) ? Rectangle.Intersect(cachedRect, b.Value) : cachedRect;
}
}
}