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Makes IntersectRect more robust. See bug #17722

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git-svn-id: trunk@16224 -
This commit is contained in:
sekelsenmat 2010-10-26 14:49:35 +00:00
parent 4579226771
commit b4b9354468
1 changed files with 20 additions and 15 deletions
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31
rtl/objpas/types.pp
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@ -344,20 +344,25 @@ end;
function IntersectRect(var Rect : TRect;const R1,R2 : TRect) : Boolean; function IntersectRect(var Rect : TRect;const R1,R2 : TRect) : Boolean;
var
lR1, lR2: TRect;
begin begin
Rect:=R1; // We copy the parameter to a local variables to avoid problems
with R2 do // when passing the same rectangle in the var and const parameters.
begin // See http://bugs.freepascal.org/view.php?id=17722
if Left>R1.Left then lR1 := R1;
Rect.Left:=Left; lR2 := R2;
if Top>R1.Top then
Rect.Top:=Top; Rect := lR1;
if Right<R1.Right then if lR2.Left > lR1.Left then
Rect.Right:=Right; Rect.Left := lR2.Left;
if Bottom<R1.Bottom then if lR2.Top > R1.Top then
Rect.Bottom:=Bottom; Rect.Top := lR2.Top;
end; if lR2.Right < R1.Right then
Rect.Right := lR2.Right;
if lR2.Bottom < R1.Bottom then
Rect.Bottom := lR2.Bottom;
if IsRectEmpty(Rect) then if IsRectEmpty(Rect) then
begin begin
FillChar(Rect,SizeOf(Rect),0); FillChar(Rect,SizeOf(Rect),0);