Re: [Openexr-devel] Surviving partial-saved exr tiles

[Florian Kainz]

Two points I forgot to mention in my previous mail:

* If the program that writes the tiled image receives the tiles
  in random order, setting the image file's lineOrder to RANDOM_Y
  ensures that each tile appears in the output file as soon as
  it is passed to the IlmImf library.  (With INCREASING_Y or
  DECREASING_Y order the library buffers the tiles until it can
  store them in the file in the correct order.)

* The exrdisplay image viewer does not attempt to recover as
  much of the file as possible; exrdisplay gives up as soon as
  it encounters a missing scan line or tile.  If the first
  tile that exrdisplay attempts to read happens to be missing
  then no image is displayed at all.

Florian



Florian Kainz wrote:
> Hi Ton,
>
> incomplete tile-based files should be readable.  When you attempt
> to read a missing tile an exception is thrown, but you should be
> able to continue reading after you have caught the exception:
>
>     for (int tileY = 0; tileY < in.numYTiles(); ++tileY)
>         for (int tileX = 0; tileX < in.numXTiles(); ++tileX)
>             try
>             {
>                 in.readTile (tileX, tileY);
>             }
>             catch (Iex::InputExc &)
>             {
>                 continue;
>             }
>
> Do you have an example file where continuing to read after a
> missing tile does not work?
>
> Florian
>
> ---
>
> P.S.: I did reply to one or two recent mails from you, but my
> mails directly to you all bounced.
>
>
>
> Ton Roosendaal wrote:
> > Hi,
> >
> > Blender is saving tile-based exr files now in the core render loop,  
> > saving to disk rendering results to read back after all tiles have 
> > been  completed.
> > Howver, on a user-break these files are not readable, since tiles are  
> > missing in the file.
> >
> > Is there a way to properly close an exr file with only parts of the  
> > tiles in it?
> >
> > Thanks,
> >
> > -Ton-
> >
> > (Note; if this mail comes through, my replies to the previous 
> > question  never made it... for some reason the nongnu mail server 
> > bounces mails I  send).
> >
> > ------------------------------------------------------------------------ 
> > --
> > Ton Roosendaal  Blender Foundation address@hidden  
> > http://www.blender.org
> >
> >
> >
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