[Tcl-bugs] [ tktoolkit-Bugs-923555 ] [image data -format] ignores old image formats

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Bugs item #923555, was opened at 2004-03-25 18:55
Message generated for change (Settings changed) made by dgp
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Category: 41. Photo Images
Group: current: 8.5a1
Status: Open
Resolution: None
Priority: 5
Submitted By: Don Porter (dgp)
>Assigned to: Donal K. Fellows (dkf)
Summary: [image data -format] ignores old image formats

Initial Comment:

Lines 937-946 of tkImgPhoto.c loop
through the photo image formats
on the formatList seeking one which
will support the -format.

There's no following loop through
the oldFormatList.  This means if
the requested -format is implemented
via either.

    Tk_CreateOldPhotoImageFormat()

or
 
    #define USE_OLD_IMAGE
    Tk_CreatePhotoImageFormat()

then it's offered stringWriteProc will
just be ignored.

This bug may have been around since
the change in photo image formats (8.2?).

We might have caught it, except none of
the built-in photo image formats supports
a stringWriteProc, and thus we have no
tests of the [image data -format] command.


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