Add wxBitmapBundle::GetBitmapFor() helper

This can be used to get the bitmap of the size appropriate for the DPI
scaling used for the given window.

include/wx/bmpbndl.h

@@ -109,6 +109,11 @@ public:
     // If size == wxDefaultSize, GetDefaultSize() is used for it instead.
     wxBitmap GetBitmap(const wxSize& size) const;
 
+    // Helper combining GetBitmap() and GetPreferredSizeFor(): returns the
+    // bitmap of the size appropriate for the current DPI scaling of the given
+    // window.
+    wxBitmap GetBitmapFor(const wxWindow* window) const;
+
     // Access implementation
     wxBitmapBundleImpl* GetImpl() const { return m_impl.get(); }
 

interface/wx/bmpbndl.h

@@ -288,6 +288,19 @@ public:
         consume resources until the application termination.
      */
     wxBitmap GetBitmap(const wxSize& size) const;
+
+    /**
+        Get bitmap of the size appropriate for the DPI scaling used by the
+        given window.
+
+        This helper function simply combines GetBitmap() and
+        GetPreferredSizeFor(), i.e. it returns a (normally unscaled) bitmap
+        from the bundle of the closest size to the size that should be used at
+        the DPI scaling of the provided window.
+
+        @param window Non-null and fully created window.
+     */
+    wxBitmap GetBitmapFor(const wxWindow* window) const;
 };
 
 /**

src/common/bmpbndl.cpp

@@ -407,6 +407,11 @@ wxBitmap wxBitmapBundle::GetBitmap(const wxSize& size) const
     return bmp;
 }
 
+wxBitmap wxBitmapBundle::GetBitmapFor(const wxWindow* window) const
+{
+    return GetBitmap(GetPreferredSizeFor(window));
+}
+
 // ============================================================================
 // wxBitmapBundleImpl implementation
 // ============================================================================