[Octave-bug-tracker] [bug #46417] GL2PS info: OpenGL feedback buffer overflow when printing

[Pantxo Diribarne]

Follow-up Comment #7, bug #46417 (project octave):

@Rik: the structure we are using now in default is the same as in gl2psTest.c,
that is why you observe the same behavior in Octave and this example. As you
noted "gl2psEndPage ()" always returns GL2PS_NO_FEEDBACK because we just ended
the viewport using "gl2psEndViewport ()". The latter returns what we used to
expect (see comments in
http://hg.savannah.gnu.org/hgweb/octave/rev/395140e53656):


gl2psBeginPage ()
  // First axes
  gl2psBeginViewport ()
    // draw_axes
  state = gl2psEndViewport () // Check this one for errors and warnings

  ...

  // Nth axes
  gl2psBeginViewport ()
    // draw_axes
  state = gl2psEndViewport () // Check this one for errors and warnings
state = gl2psEndPage () // Not meaningful


Detecting the overflow from "gl2psEndViewport ()" works well (see attached
patch), the problem is how to handle corrupted processes: at the time we
detect the overflow, the stream (a file or a process to which we pipe gl2ps
output) is already corrupted. We can't simply rewind and overwrite it ...  


(file #35569)
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Additional Item Attachment:

File name: overflow.patch                 Size:3 KB


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