[gtk] (7 commits) Non-fast-forward update to branch wip/otte/float-textures

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/float-textures' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  1344eae... texture: Remove unused argument from vfunc
  4790d9d... texture: Add GdkMemoryConversion private enum
  8cc20e1... texture: Add gdk_texture_download_float()

Commits added to the branch:

  9f2b847... rendernode: Write the whole node (*)
  462e845... texture: Remove unused argument from vfunc
  f61a75f... texture: Add GdkMemoryConversion private enum
  25ae53e... texture: Add gdk_texture_download_float()
  3021884... memorytexture: Add support for HDR formats
  9375886... testsuite: Overhaul memorytexture test
  5b4694c... testsuite: Rework memorytexture test some more

(*) This commit already existed in another branch; no separate mail sent