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[Frederic Da Vitoria <davitofrg@xxxxxxxxx>]

Public bug reported:

Hugin 2013.0, Windows 7 64 bits SP1, RAM 8 GB, Intel HD graphics 4000

On a 3 images 82 CPs optimised panorama, when I check "Show control
points", I get only 2 CPs, and these are wrong, they are not where
actual CPs are. Furthermore, when I click on an image button to hide one
of the images, a strange part of the complete image turns to black, so
that I see less than what the 2 remaining images should amount to. This
happens only when "Show control points" is checked. When it is
unchecked, hiding an image behaves as expected. If I mask 2 images, than
I see only a part of the remaining image. This looks a little like if
the image masking used a Xor where it should use an Or. Hiding or
revealing an image moves the 2 CPs, but there are always 2 CPs. The
behaviour is not consistent: checking and unchecking "Show control
points" when only image 2 is visible show 2 different results, both
wrong, which come back in a 3 step cycle. Doing the same with image 1
shows 3 different results, all wrong, which also come back in a cycle.
Doing the same with image 3 has the same pattern as with image 1. I
added a 4th image to the panorama, but without generating new CPs,
nothing changed and when this 4th image is dispalyed alone, I don't see
anything strange in it's shape (but it shows completely white :-/ )

There is a thread about this bug in the ML:
https://groups.google.com/forum/#!topic/hugin-ptx/EC-DShQjDus

** Affects: hugin
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1258925

Title:
  Fast preview bugs on Intel HD 4x00

Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  Hugin 2013.0, Windows 7 64 bits SP1, RAM 8 GB, Intel HD graphics 4000

  On a 3 images 82 CPs optimised panorama, when I check "Show control
  points", I get only 2 CPs, and these are wrong, they are not where
  actual CPs are. Furthermore, when I click on an image button to hide
  one of the images, a strange part of the complete image turns to
  black, so that I see less than what the 2 remaining images should
  amount to. This happens only when "Show control points" is checked.
  When it is unchecked, hiding an image behaves as expected. If I mask 2
  images, than I see only a part of the remaining image. This looks a
  little like if the image masking used a Xor where it should use an Or.
  Hiding or revealing an image moves the 2 CPs, but there are always 2
  CPs. The behaviour is not consistent: checking and unchecking "Show
  control points" when only image 2 is visible show 2 different results,
  both wrong, which come back in a 3 step cycle. Doing the same with
  image 1 shows 3 different results, all wrong, which also come back in
  a cycle. Doing the same with image 3 has the same pattern as with
  image 1. I added a 4th image to the panorama, but without generating
  new CPs, nothing changed and when this 4th image is dispalyed alone, I
  don't see anything strange in it's shape (but it shows completely
  white :-/ )

  There is a thread about this bug in the ML:
  https://groups.google.com/forum/#!topic/hugin-ptx/EC-DShQjDus

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