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Be more conservative in avoiding Cairo's maximum coordinate limit.

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Fixes wxGCDC::Clear().
See #17584

(cherry picked from commit fa54e1af158e2cbe5014efefddffd6c2704bb9bf)
This commit is contained in:
Paul Cornett 2016-07-08 22:57:27 -07:00
parent 0264b2218c
commit 3e9bd07e3f
1 changed files with 2 additions and 1 deletions
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src/common/dcgraph.cpp
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@ -1202,9 +1202,10 @@ void wxGCDCImpl::Clear(void)
wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
// maximum positive coordinate Cairo can handle is 2^23 - 1
// Use a value slightly less than this to be sure we avoid the limit
DoDrawRectangle(
DeviceToLogicalX(0), DeviceToLogicalY(0),
DeviceToLogicalXRel(0x007fffff), DeviceToLogicalYRel(0x007fffff));
DeviceToLogicalXRel(0x800000 - 64), DeviceToLogicalYRel(0x800000 - 64));
m_graphicContext->SetCompositionMode(formerMode);
m_graphicContext->SetPen( m_pen );
m_graphicContext->SetBrush( m_brush );