void CWsSpriteBase::CalcRedrawRegion(const TRegion& aSourceRegion, TRegion& aTarget) const
{
aTarget.Copy(aSourceRegion);
if (ClipSprite())
{
TPoint origin(0,0);
if(iWin)
origin = iWin->Origin();
TRect rect(iBasePos + origin + iClipOffset, iClipSize);
aTarget.ClipRect(rect);
}
aTarget.ClipRect(RootWindow()->Abs());
// Only need to draw if the region being redrawn overlaps the sprite
const TRect spriteRect(Pos(), iSize);
STACK_REGION spriteRegion;
spriteRegion.AddRect(spriteRect);
aTarget.Intersect(spriteRegion);
spriteRegion.Close();
}
void CWsWindow::AreaCovered(TRegion &aRegion)
{
aRegion.Copy(WindowArea());
}