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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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src/common/imagpng.cpp
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@@ -302,7 +302,7 @@ bool wxPNGHandler::DoCanRead( wxInputStream& stream )
{
unsigned char hdr[4];
if ( !stream.Read(hdr, WXSIZEOF(hdr)) )
if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
return false;
return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;