X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ae3c17b4013e80b99976c750c19fca47729517f6..1b7751aaa9a86d76a850b9267bc0c201e3cea30f:/interface/wx/dcmemory.h

diff --git a/interface/wx/dcmemory.h b/interface/wx/dcmemory.h
index e1e6a998eb..100fc9beea 100644
--- a/interface/wx/dcmemory.h
+++ b/interface/wx/dcmemory.h
@@ -3,12 +3,11 @@
 // Purpose:     interface of wxMemoryDC
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 /**
     @class wxMemoryDC
-    @wxheader{dcmemory.h}
 
     A memory device context provides a means to draw graphics onto a bitmap.
     When drawing in to a mono-bitmap, using @c wxWHITE, @c wxWHITE_PEN and
@@ -51,16 +50,28 @@ public:
     /**
         Constructs a new memory device context.
 
-        Use the wxDC::Ok() member to test whether the constructor was
+        Use the wxDC::IsOk() member to test whether the constructor was
         successful in creating a usable device context. Don't forget to select
         a bitmap into the DC before drawing on it.
     */
     wxMemoryDC();
+
+    /**
+        Constructs a new memory device context having the same characteristics
+        as the given existing device context.
+
+        This constructor creates a memory device context @e compatible with @a
+        dc in wxMSW, the argument is ignored in the other ports. If @a dc is
+        @NULL, a device context compatible with the screen is created, just as
+        with the default constructor.
+     */
+    wxMemoryDC(wxDC *dc);
+
     /**
         Constructs a new memory device context and calls SelectObject() with
         the given bitmap.
 
-        Use the wxDC::Ok() member to test whether the constructor was
+        Use the wxDC::IsOk() member to test whether the constructor was
         successful in creating a usable device context.
     */
     wxMemoryDC(wxBitmap& bitmap);
@@ -70,13 +81,17 @@ public:
         should use when you select a bitmap because you want to modify it, e.g.
         drawing on this DC.
 
-        Using SelectObjectAsSource() when modifying the bitmap may incurr some
+        Using SelectObjectAsSource() when modifying the bitmap may incur some
         problems related to wxBitmap being a reference counted object (see
         @ref overview_refcount).
 
-        Also, before using the updated bitmap data, make sure to select it out
-        of context first (for example by selecting wxNullBitmap into the device
-        context).
+        Before using the updated bitmap data, make sure to select it out of
+        context first either by selecting ::wxNullBitmap into the device
+        context or destroying the device context entirely.
+
+        If the bitmap is already selected in this device context, nothing is
+        done. If it is selected in another context, the function asserts and
+        drawing on the bitmap won't work correctly.
 
         @see wxDC::DrawBitmap()
     */
@@ -89,7 +104,7 @@ public:
         the bitmap to a window. For this purpose, you may find wxDC::DrawIcon()
         easier to use instead.
 
-        If the argument is wxNullBitmap (or some other uninitialised wxBitmap)
+        If the argument is ::wxNullBitmap (or some other uninitialised wxBitmap)
         the current bitmap is selected out of the device context, and the
         original bitmap restored, allowing the current bitmap to be destroyed
         safely.