From 01b5ab3367bc503021b7b39e4162f2e8fd8022f1 Mon Sep 17 00:00:00 2001
From: Stefan Csomor <csomor@advancedconcepts.ch>
Date: Wed, 4 Jan 2006 11:43:45 +0000
Subject: [PATCH] starting blend modes for Core Graphics

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36675 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/mac/carbon/dccg.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/mac/carbon/dccg.cpp b/src/mac/carbon/dccg.cpp
index 2a4f178ef9..24a5331756 100755
--- a/src/mac/carbon/dccg.cpp
+++ b/src/mac/carbon/dccg.cpp
@@ -37,6 +37,10 @@
 
 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
 
+#ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
+#define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
+#endif
+
 //-----------------------------------------------------------------------------
 // constants
 //-----------------------------------------------------------------------------
@@ -1194,6 +1198,15 @@ void wxDC::SetLogicalFunction( int function )
         return;
 
     m_logicalFunction = function ;
+#if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
+    CGContextRef cgContext = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
+    if ( m_logicalFunction == wxCOPY )
+        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
+    else if ( m_logicalFunction == wxINVERT )
+        CGContextSetBlendMode( cgContext, kCGBlendModeExclusion ) ;
+    else
+        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
+#endif
 }
 
 extern bool wxDoFloodFill(wxDC *dc, wxCoord x, wxCoord y,
@@ -1227,8 +1240,10 @@ void wxDC::DoDrawLine( wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2 )
 {
     wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawLine - invalid DC") );
 
+#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
     if ( m_logicalFunction != wxCOPY )
         return ;
+#endif    
 
     wxCoord xx1 = XLOG2DEVMAC(x1) ;
     wxCoord yy1 = YLOG2DEVMAC(y1) ;
@@ -1382,8 +1397,10 @@ void wxDC::DoDrawLines(int n, wxPoint points[],
 {
     wxCHECK_RET( Ok(), wxT("wxDC(cg)::DoDrawLines - invalid DC") );
 
+#if !wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
     if ( m_logicalFunction != wxCOPY )
         return ;
+#endif    
 
     wxCoord x1, x2 , y1 , y2 ;
     x1 = XLOG2DEVMAC(points[0].x + xoffset);