added support for saving grey and grey-red PNG images (patch 985447)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32414 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2005-02-27 15:24:50 +00:00
parent 04d4e6846e
commit a4efa72179
3 changed files with 156 additions and 33 deletions
--- a/include/wx/imagpng.h
+++ b/include/wx/imagpng.h
@@ -21,6 +21,17 @@
 //-----------------------------------------------------------------------------

 #if wxUSE_LIBPNG
+
+#define wxIMAGE_OPTION_PNG_FORMAT    wxT("PngFormat")
+#define wxIMAGE_OPTION_PNG_BITDEPTH  wxT("PngBitDepth")
+
+enum
+{
+    wxPNG_TYPE_COLOUR = 0,
+    wxPNG_TYPE_GREY = 2,
+    wxPNG_TYPE_GREY_RED = 3,
+};
+
 class WXDLLEXPORT wxPNGHandler: public wxImageHandler
 {
 public: