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changing compositing mode for Clear, see #12756

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66362 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Stefan Csomor
2010-12-11 11:48:38 +00:00
parent 54ea28348c
commit 954c66fafc
1 changed files with 7 additions and 2 deletions
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9
src/common/dcgraph.cpp
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@@ -57,8 +57,10 @@ static bool TranslateRasterOp(wxRasterOperationMode function, wxCompositionMode
{ {
switch ( function ) switch ( function )
{ {
case wxCOPY: // (default) src case wxCOPY: // src
*op = wxCOMPOSITION_SOURCE; // // since we are supporting alpha, _OVER is closer to the intention than _SOURCE
// since the latter would overwrite even when alpha is is not set to opaque
*op = wxCOMPOSITION_OVER;
break; break;
case wxOR: // src OR dst case wxOR: // src OR dst
*op = wxCOMPOSITION_ADD; *op = wxCOMPOSITION_ADD;
@@ -1047,7 +1049,10 @@ void wxGCDCImpl::Clear(void)
m_graphicContext->SetBrush( m_backgroundBrush ); m_graphicContext->SetBrush( m_backgroundBrush );
wxPen p = *wxTRANSPARENT_PEN; wxPen p = *wxTRANSPARENT_PEN;
m_graphicContext->SetPen( p ); m_graphicContext->SetPen( p );
wxCompositionMode formerMode = m_graphicContext->GetCompositionMode();
m_graphicContext->SetCompositionMode(wxCOMPOSITION_SOURCE);
DoDrawRectangle( 0, 0, 32000 , 32000 ); DoDrawRectangle( 0, 0, 32000 , 32000 );
m_graphicContext->SetCompositionMode(formerMode);
m_graphicContext->SetPen( m_pen ); m_graphicContext->SetPen( m_pen );
m_graphicContext->SetBrush( m_brush ); m_graphicContext->SetBrush( m_brush );
} }