Add support for template NSImages to wxBitmap

wxBitmap uses CGImage instead of NSImage internally and the conversion
looses NSImage metadata.  In particular, it looses the "template"
attribute, which is set for files ending with "Template" and loaded
trough wxArtProvider.

This change makes it easy to use template images with native controls
such as the toolbar.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78016 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/core/bitmap.cpp

@@ -82,6 +82,9 @@ public:
     bool HasAlpha() const { return m_hasAlpha; }
     void UseAlpha( bool useAlpha );
 
+    bool IsTemplate() const { return m_isTemplate; }
+    void SetTemplate(bool is) { m_isTemplate = is; }
+
 public:
 #if wxUSE_PALETTE
     wxPalette     m_bitmapPalette;
@@ -122,6 +125,7 @@ public:
     int           m_rawAccessCount;
     bool          m_ok;
     mutable CGImageRef    m_cgImageRef;
+    bool          m_isTemplate;
 
 #ifndef __WXOSX_IPHONE__
     IconRef       m_iconRef;
@@ -236,6 +240,7 @@ void wxBitmapRefData::Init()
     m_ok = false ;
     m_bitmapMask = NULL ;
     m_cgImageRef = NULL ;
+    m_isTemplate = false;
 
 #ifndef __WXOSX_IPHONE__
     m_iconRef = NULL ;
@@ -1074,7 +1079,11 @@ wxBitmap::wxBitmap(WX_NSImage image)
 
 bool wxBitmap::Create(WX_NSImage image)
 {
-    return Create(wxOSXCreateBitmapContextFromNSImage(image));
+    bool isTemplate;
+    if (!Create(wxOSXCreateBitmapContextFromNSImage(image, &isTemplate)))
+        return false;
+    M_BITMAPDATA->SetTemplate(isTemplate);
+    return true;
 }
 
 wxBitmap::wxBitmap(CGContextRef bitmapcontext)
@@ -1094,7 +1103,7 @@ bool wxBitmap::Create(CGContextRef bitmapcontext)
 WX_NSImage wxBitmap::GetNSImage() const
 {
     wxCFRef< CGImageRef > cgimage(CreateCGImage());
-    return wxOSXGetNSImageFromCGImage( cgimage, GetScaleFactor() );
+    return wxOSXGetNSImageFromCGImage( cgimage, GetScaleFactor(), M_BITMAPDATA->IsTemplate() );
 }
 
 #endif