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TIFF and LibTiff Mail List Archive

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2012.09.06 15:30 "[Tiff] Managing the buffer", by
2012.09.06 17:10 "Re: [Tiff] Managing the buffer", by
2012.09.07 09:21 "Re: [Tiff] Managing the buffer", by
2012.09.07 09:57 "Re: [Tiff] Managing the buffer", by Joris Van Damme
2012.09.07 10:26 "RE: [Tiff] Managing the buffer", by
2012.09.07 11:01 "Re: [Tiff] Managing the buffer", by Joris Van Damme
2012.09.07 13:12 "RE: [Tiff] Managing the buffer", by
2012.09.07 13:39 "Re: [Tiff] Managing the buffer", by Joris Van Damme
2012.09.07 13:45 "RE: [Tiff] Managing the buffer", by
2012.09.07 14:16 "Re: [Tiff] Managing the buffer", by Bob Friesenhahn
2012.09.07 14:31 "Re: [Tiff] Managing the buffer", by
2012.09.07 15:52 "Re: [Tiff] Managing the buffer", by Bob Friesenhahn
2012.09.07 11:25 "Re: [Tiff] Managing the buffer", by

2012.09.06 15:30 "[Tiff] Managing the buffer", by

Dear TIFF list:

I would like (for complicated reasons) to write a large number of TIFF images that are the same size. I wish to have a pre-allocated buffer and not allocate a new buffer each time I want to write an image. I gather from reading various man-pages that TIFFWriteBufferSetup() may be used for such cases as mentioned in the man page -- " 'intelligent clients' that wish to optimize memory usage and/or eliminate potential copy operations that can occur when working with images that have data stored without compression "

That nicely states what I wish to do.

However, I don't quite understand at what point this routine should be called.

If I call TIFFOpen, then it seems that the buffer gets allocated if it isn't already allocated ;

But if I don't call TIFFopen, then I don't have a valid TIFF structure to call? When I call TIFFClose, doesn't it deallocate the buffer?

1 allocate a buffer
2 call TIFFWriteBufferSetup
3 call TIFFOpen
4 call TIFFWrite[scanline,strip...]
5 call TIFFClose
6 loop to 3?

This doesn't make sense because I don't have a TIFF structure pointer at 2

Or

1 allocate a buffer
2 call TIFFOpen
3 call TIFFWriteBufferSetup
4 call TIFFWrite[scanline,strip...]
5 call TIFFClose
6 loop to 2?

This doesn't seem to make sense because I suppose that TIFFOpen will allocate a buffer, and TIFFClose will free the buffer?

Thanks for any help!

Regards,
Robert

____________________

Dr. Robert C. Atwood
Senior Support Scientist
Beamline I12-JEEP
The Joint Engineering and Environmental Processing Beamline
Diamond Light Source
The Harwell Science and Innovation Campus
Didcot,OXON
OX11 0DE
+44 (0) 1235 778 670

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