[gtk] (10 commits) Non-fast-forward update to branch gamma-shenanigans

[Matthias Clasen <matthiasc src gnome org>]

The branch 'gamma-shenanigans' 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:

  d1b938b... Support 16bit textures
  5f37eee... Add private api to download textures
  e908853... Support loading and saving 16bit pngs
  e564c96... Support 16-bit floating point textures
  338471d... Support 32-bit floating point textures
  eb4cd15... Add gdk_texture_save_to_file
  b566d3d... Support loading and saving float textures
  08ad49d... Redo the conversion setup for memory formats
  8e443b9... Allow conversion to hdr formats
  c33a917... Add gdk_texture_download_float

Commits added to the branch:

  b935ffc... Support 16bit textures
  ba52ea7... Add private api to download textures
  f081a5f... Support loading and saving 16bit pngs
  4c729c5... Support 16-bit floating point textures
  e643e4b... Support 32-bit floating point textures
  e9bee9a... Add gdk_texture_save_to_file
  ed49737... Support loading and saving float textures
  7915f33... Redo the conversion setup for memory formats
  6b10dc5... Allow conversion to hdr formats
  fe03bfa... Add gdk_texture_download_float