No changes, just clarify a comment for WXK_XXX values.

[wxWidgets.git] / include / wx / image.h

diff --git a/include/wx/image.h b/include/wx/image.h
index 49ea7b2229c3ae6c7620aae07dfcf67f1e82450d..03c1ea2210f694f4d5365642c27e49cd0eb55bde 100644 (file)
--- a/include/wx/image.h
+++ b/include/wx/image.h
@@ -18,6 +18,7 @@
 #include "wx/string.h"
 #include "wx/gdicmn.h"
 #include "wx/hashmap.h"
+#include "wx/arrstr.h"
 
 #if wxUSE_STREAMS
 #  include "wx/stream.h"
@@ -27,17 +28,17 @@
 // which breaks the compilation below
 #undef index
 
-#define wxIMAGE_OPTION_QUALITY  wxString(_T("quality"))
-#define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
+#define wxIMAGE_OPTION_QUALITY  wxString(wxT("quality"))
+#define wxIMAGE_OPTION_FILENAME wxString(wxT("FileName"))
 
-#define wxIMAGE_OPTION_RESOLUTION            wxString(_T("Resolution"))
-#define wxIMAGE_OPTION_RESOLUTIONX           wxString(_T("ResolutionX"))
-#define wxIMAGE_OPTION_RESOLUTIONY           wxString(_T("ResolutionY"))
+#define wxIMAGE_OPTION_RESOLUTION            wxString(wxT("Resolution"))
+#define wxIMAGE_OPTION_RESOLUTIONX           wxString(wxT("ResolutionX"))
+#define wxIMAGE_OPTION_RESOLUTIONY           wxString(wxT("ResolutionY"))
 
-#define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(_T("ResolutionUnit"))
+#define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(wxT("ResolutionUnit"))
 
-#define wxIMAGE_OPTION_MAX_WIDTH             wxString(_T("MaxWidth"))
-#define wxIMAGE_OPTION_MAX_HEIGHT            wxString(_T("MaxHeight"))
+#define wxIMAGE_OPTION_MAX_WIDTH             wxString(wxT("MaxWidth"))
+#define wxIMAGE_OPTION_MAX_HEIGHT            wxString(wxT("MaxHeight"))
 
 // constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
 //
@@ -97,10 +98,17 @@ public:
         { }
 
 #if wxUSE_STREAMS
-    virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
-    virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=true );
-
-    virtual int GetImageCount( wxInputStream& stream );
+    // NOTE: LoadFile and SaveFile are not pure virtuals to allow derived classes
+    //       to implement only one of the two
+    virtual bool LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream),
+                           bool WXUNUSED(verbose)=true, int WXUNUSED(index)=-1 )
+        { return false; }
+    virtual bool SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream),
+                           bool WXUNUSED(verbose)=true )
+        { return false; }
+
+    int GetImageCount( wxInputStream& stream );
+        // save the stream position, call DoGetImageCount() and restore the position
 
     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
     bool CanRead( const wxString& name );
@@ -125,6 +133,13 @@ public:
 
 protected:
 #if wxUSE_STREAMS
+    // NOTE: this function is allowed to change the current stream position
+    //       since GetImageCount() will take care of restoring it later
+    virtual int DoGetImageCount( wxInputStream& WXUNUSED(stream) )
+        { return 1; }       // default return value is 1 image
+
+    // NOTE: this function is allowed to change the current stream position
+    //       since CallDoCanRead() will take care of restoring it later
     virtual bool DoCanRead( wxInputStream& stream ) = 0;
 
     // save the stream position, call DoCanRead() and restore the position
@@ -260,7 +275,7 @@ public:
     bool Create( int width, int height, bool clear = true );
     bool Create( int width, int height, unsigned char* data, bool static_data = false );
     bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
-    
+
     // Create() variants using wxSize:
     bool Create( const wxSize& sz, bool clear = true )
         { return Create(sz.GetWidth(), sz.GetHeight(), clear); }
@@ -270,7 +285,7 @@ public:
         { return Create(sz.GetWidth(), sz.GetHeight(), data, alpha, static_data); }
 
     void Destroy();
-   
+
     // initialize the image data with zeroes
     void Clear(unsigned char value = 0);