Separate NSAffineTransform creation out of wxDC::CocoaApplyTransform into

static wxDC::CocoaGetWxToBoundsTransform.  Create the transform and store
it as a member variable in wxDC when focus is locked on the DC.
For wxClientDC and wxPaintDC call a new wxWindow::CocoaGetWxToBoundsTransform
which will eventually handle scrolling.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31360 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/dc.h

@@ -12,6 +12,8 @@
 #ifndef __WX_COCOA_DC_H__
 #define __WX_COCOA_DC_H__
 
+DECLARE_WXCOCOA_OBJC_CLASS(NSAffineTransform);
+
 class WXDLLEXPORT wxDC;
 WX_DECLARE_LIST(wxDC, wxCocoaDCStack);
 
@@ -38,6 +40,8 @@ public:
     static WX_NSTextStorage sm_cocoaNSTextStorage;
     static WX_NSLayoutManager sm_cocoaNSLayoutManager;
     static WX_NSTextContainer sm_cocoaNSTextContainer;
+    // Create a simple Wx to Bounds transform (just flip the coordinate system)
+    static WX_NSAffineTransform CocoaGetWxToBoundsTransform(bool isFlipped, float height);
 protected:
 // DC stack
     static wxCocoaDCStack sm_cocoaDCStack;
@@ -54,8 +58,7 @@ protected:
     void CocoaUnwindStackAndLoseFocus();
 // DC flipping/transformation
     void CocoaApplyTransformations();
-    float m_cocoaHeight;
-    bool m_cocoaFlipped;
+    WX_NSAffineTransform m_cocoaWxToBoundsTransform;
 // Blitting
     virtual bool CocoaDoBlitOnFocusedDC(wxCoord xdest, wxCoord ydest,
         wxCoord width, wxCoord height, wxCoord xsrc, wxCoord ysrc,