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document that CanRead() and GetImageCount() functions of wxImageHandlers do NOT modify the current stream position and that they require seekable streams; rename current GetImageCount() functions to DoGetImageCount() and put save-and-restore stream position logic in GetImageCount(); add comments in the various DoCanRead() and in DoGetImageCount() where the stream position is modified; remove unneeded SeekI(0) calls from DoCanRead() and DoGetImageCount() functions: they didn't allow to load images from non-seekable streams; implement forward-seeking in wxInputStream::SeekI() also for non-seekable streams

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2009-06-01 11:43:36 +00:00
parent 1f51673bb8
commit 8faef7ccbc
25 changed files with 236 additions and 93 deletions
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6
include/wx/imagbmp.h
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@@ -89,8 +89,9 @@ public:
virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=true );
virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
virtual bool DoLoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index );
virtual int GetImageCount( wxInputStream& stream );
protected:
virtual int DoGetImageCount( wxInputStream& stream );
virtual bool DoCanRead( wxInputStream& stream );
#endif // wxUSE_STREAMS
@@ -145,8 +146,9 @@ public:
#if wxUSE_STREAMS
virtual bool SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose=true) ){return false ;}
virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
virtual int GetImageCount( wxInputStream& stream );
protected:
virtual int DoGetImageCount( wxInputStream& stream );
virtual bool DoCanRead( wxInputStream& stream );
#endif // wxUSE_STREAMS