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implement support for wxOR and wxCLEAR in wxCairoContext::SetLogicalFunction() (#9808)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54897 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2008-08-01 14:03:17 +00:00
parent 4c7b2d367e
commit 49ad157e30
1 changed files with 131 additions and 81 deletions
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50
src/generic/graphicc.cpp
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@ -356,6 +356,8 @@ public:
virtual void * GetNativeContext();
virtual bool SetLogicalFunction( int function );
virtual void StrokePath( const wxGraphicsPath& p );
virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
@ -1520,6 +1522,54 @@ void * wxCairoContext::GetNativeContext()
return m_context;
}
// Cairo doesn't support bitwise logical function (a.k.a. ROP, raster output
// mode). Cairo supports Porter-Duff compositing operators, but they are quite
// different, although in some cases have similar names.
bool wxCairoContext::SetLogicalFunction( int function )
{
if (m_logicalFunction == function)
return true;
cairo_operator_t op;
switch ( function )
{
case wxCOPY: // (default) src
op = CAIRO_OPERATOR_OVER; // (also default)
break;
case wxOR: // src OR dst
op = CAIRO_OPERATOR_ADD;
break;
case wxNO_OP: // dst
op = CAIRO_OPERATOR_DEST; // ignore the source
break;
case wxCLEAR: // 0
op = CAIRO_OPERATOR_CLEAR;// clear dst
break;
case wxAND: // src AND dst
case wxAND_INVERT: // (NOT src) AND dst
case wxAND_REVERSE:// src AND (NOT dst)
case wxEQUIV: // (NOT src) XOR dst
case wxINVERT: // NOT dst
case wxNAND: // (NOT src) OR (NOT dst)
case wxNOR: // (NOT src) AND (NOT dst)
case wxOR_INVERT: // (NOT src) OR dst
case wxOR_REVERSE: // src OR (NOT dst)
case wxSET: // 1
case wxSRC_INVERT: // NOT src
//wxXOR does _not_ correspond to CAIRO_OPERATOR_XOR
case wxXOR: // src XOR dst
default:
return false;
}
m_logicalFunction = function;
cairo_set_operator(m_context, op);
return true;
}
//-----------------------------------------------------------------------------
// wxCairoRenderer declaration
//-----------------------------------------------------------------------------