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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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8
src/common/anidecod.cpp
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@@ -113,10 +113,10 @@ wxColour wxANIDecoder::GetTransparentColour(unsigned int frame) const
// ANI reading and decoding
//---------------------------------------------------------------------------
bool wxANIDecoder::CanRead(wxInputStream& stream) const
bool wxANIDecoder::DoCanRead(wxInputStream& stream) const
{
wxInt32 FCC1, FCC2;
wxUint32 datalen ;
wxUint32 datalen;
wxInt32 riff32;
memcpy( &riff32, "RIFF", 4 );
@@ -127,8 +127,6 @@ bool wxANIDecoder::CanRead(wxInputStream& stream) const
wxInt32 anih32;
memcpy( &anih32, "anih", 4 );
if ( stream.SeekI(0) == wxInvalidOffset )
return false;
if ( !stream.Read(&FCC1, 4) )
return false;
@@ -222,8 +220,6 @@ bool wxANIDecoder::Load( wxInputStream& stream )
wxInt32 seq32;
memcpy( &seq32, "seq ", 4 );
if ( stream.SeekI(0) == wxInvalidOffset)
return false;
if ( !stream.Read(&FCC1, 4) )
return false;
if ( FCC1 != riff32 )