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limit clipping to surface area

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41171 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík 2006-09-12 09:26:14 +00:00
parent 2d6dd9c09e
commit 564b429f74
1 changed files with 9 additions and 4 deletions
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13
src/dfb/dc.cpp
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@ -92,11 +92,16 @@ void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
{
wxCHECK_RET( Ok(), wxT("invalid dc") );
wxSize size(GetSize());
// NB: We intersect the clipping rectangle with surface's area here because
// DirectFB will return an error if you try to set clipping rectangle
// that is partially outside of the surface.
DFBRegion r;
r.x1 = XLOG2DEV(cx);
r.y1 = YLOG2DEV(cy);
r.x2 = r.x1 + XLOG2DEVREL(cw) - 1;
r.y2 = r.y1 + YLOG2DEVREL(ch) - 1;
r.x1 = wxMax(0, XLOG2DEV(cx));
r.y1 = wxMax(0, YLOG2DEV(cy));
r.x2 = wxMin(r.x1 + XLOG2DEVREL(cw), size.x) - 1;
r.y2 = wxMin(r.y1 + YLOG2DEVREL(ch), size.y) - 1;
if ( !m_surface->SetClip(&r) )
return;