adding custom sources to vtk -> what is the best way (was : RE : [vtkusers] Tiff : getting tiff size without reading the whole file)

[Sébastien MARAUX]

Thanks.

I will check this (I may also use TIFF lib directly in my source code ?)

What is the best way to modify a VTK class :

- Copying it in your project and modifying it (in order to be able to
upgrade to next VTK version without too much tuning)
- Modifying code directly in VTK source tree (mode easy / quick for a
single use, but not if I plan to follow VTK new versions)?
- Submit or ask for a code change (in tiff reader, or even in
vtkImageReader2 because this can be useful for any format when handling
huge textures) , and use VTK CVS Version.

S. Maraux



-----Message d'origine-----
De : vtkusers-admin at vtk.org [mailto:vtkusers-admin at vtk.org] De la part
de Jeremy Winston
Envoyé : lundi 9 février 2004 13:12
À : vtkusers at vtk.org
Objet : Re: [vtkusers] Tiff : getting tiff size without reading the
whole file

Sébastien MARAUX wrote:
> Hello, is it possible to get a Tiff File Image Size without reading
the 
> whole file ?

Look at ${VTK_SRC}/IO/vtkTIFFReader.cxx

The method vtkTIFFReaderInternal::Initialize() makes calls to
TIFFGetField() (which is in ${VTK_SRC}/Utilities/tif_${TARGET}.c
where TARGET is whatever you're compiling for, e.g., win32):

     if ( !TIFFGetField(this->Image, TIFFTAG_IMAGEWIDTH, &this->Width)
||
          !TIFFGetField(this->Image, TIFFTAG_IMAGELENGTH, &this->Height)
)
       {
       return 0;
       }

Since the *Internal routines are private, you can't call them directly.
You could add a method to vtkTIFFReader that opens the file, and then
makes the calls to TIFFGetField() and returns the product of the values
they return.

-Jeremy(Maybe there's a simpler way, IDK.)


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