Remove wxHAS_BITMAP_SCALE_FACTOR

Now wxMSW also stores the scale factor, even if it doesn't use it in its
GetScaledXXX(), so it doesn't seem useful to have this symbol for
distinguishing the platforms with and without bitmap scale factor
support, when we can just use wxHAS_DPI_INDEPENDENT_PIXELS instead in
the only place where this was used.

And as this symbol was added quite recently, in 2c1f4c002d (Add
wxBitmap::SetScaleFactor(), 2021-10-23), we can hopefully just remove it
without breaking any existing code, if we do it right now.

docs/doxygen/mainpages/const_cpp.h

@@ -167,9 +167,6 @@ Currently the following symbols exist:
     have an efficient (CPU-specific) implementation. Notice that the functions
     themselves are always available but can be prohibitively slow to use when
     implemented in a generic way, using a critical section.}
-@itemdef{wxHAS_BITMAP_SCALE_FACTOR, Defined in @c wx/bitmap.h if bitmaps
-    actually use scale factor under the current platform, see
-    wxBitmap::SetScaleFactor().}
 @itemdef{wxHAS_BITMAPTOGGLEBUTTON, Defined in @c wx/tglbtn.h if
     wxBitmapToggleButton class is available in addition to wxToggleButton.}
 @itemdef{wxHAS_CONFIG_TEMPLATE_RW, Defined if the currently used compiler

include/wx/gtk/bitmap.h

@@ -17,10 +17,6 @@ typedef struct _GdkPixbuf GdkPixbuf;
 class WXDLLIMPEXP_FWD_CORE wxPixelDataBase;
 class WXDLLIMPEXP_FWD_CORE wxCursor;
 
-#ifdef __WXGTK3__
-    #define wxHAS_BITMAP_SCALE_FACTOR
-#endif
-
 //-----------------------------------------------------------------------------
 // wxMask
 //-----------------------------------------------------------------------------
@@ -89,7 +85,7 @@ public:
         { return Create(sz.GetWidth(), sz.GetHeight(), depth); }
     bool Create(int width, int height, const wxDC& WXUNUSED(dc))
         { return Create(width,height); }
-#ifdef wxHAS_BITMAP_SCALE_FACTOR
+#ifdef __WXGTK3__
     virtual bool CreateScaled(int w, int h, int depth, double scale) wxOVERRIDE;
     virtual void SetScaleFactor(double scale) wxOVERRIDE;
     virtual double GetScaleFactor() const wxOVERRIDE;

include/wx/osx/bitmap.h

@@ -13,8 +13,6 @@
 
 #include "wx/palette.h"
 
-#define wxHAS_BITMAP_SCALE_FACTOR
-
 // Bitmap
 class WXDLLIMPEXP_FWD_CORE wxBitmap;
 class wxBitmapRefData ;

interface/wx/bitmap.h

@@ -816,21 +816,6 @@ public:
         When creating a new bitmap, CreateScaled() can be used to specify the
         correct scale factor from the beginning.
 
-        Note that this method exists in all ports, but simply does nothing in
-        those of them that don't use logical pixel scaling. The preprocessor
-        symbol @c wxHAS_BITMAP_SCALE_FACTOR can be tested to determine whether
-        the scale factor is really supported, e.g.
-
-        @code
-            bitmap.SetScaleFactor(2);
-
-            // In the other ports scale factor is always 1, so the assert would
-            // fail there.
-            #ifdef wxHAS_BITMAP_SCALE_FACTOR
-                wxASSERT( bitmap.GetScaleFactor() == 2 );
-            #endif
-        @endcode
-
         @since 3.1.6
      */
     virtual void SetScaleFactor(double scale);

tests/graphics/bmpbundle.cpp

@@ -73,7 +73,7 @@ TEST_CASE("BitmapBundle::GetPreferredSize", "[bmpbundle]")
     CHECK( b.GetPreferredSizeAtScale(3   ) == 3*normal );
 }
 
-#ifdef wxHAS_BITMAP_SCALE_FACTOR
+#ifdef wxHAS_DPI_INDEPENDENT_PIXELS
 
 TEST_CASE("BitmapBundle::Scaled", "[bmpbundle]")
 {
@@ -105,7 +105,7 @@ TEST_CASE("BitmapBundle::Scaled", "[bmpbundle]")
     CHECK( b.GetDefaultSize() == wxSize(32, 32) );
 }
 
-#endif // wxHAS_BITMAP_SCALE_FACTOR
+#endif // wxHAS_DPI_INDEPENDENT_PIXELS
 
 #ifdef wxHAS_SVG