[gtk] (31 commits) Non-fast-forward update to branch image-loading

[Matthias Clasen <matthiasc src gnome org>]

The branch 'image-loading' 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:

  e132b8a... Add code to load and save pngs
  11ae8b7... Load pngs without gdk-pixbuf
  46cd5ad... Add tests for the png loader
  a09ca9e... Add code to load and save tiff files
  5d41546... Load tiffs without gdk-pixbuf
  d6150d2... Add tests for the tiff loader
  465db72... Add gdk_texture_save_to_file
  13eb8e0... Use our png loader for content (de)serialization
  8729246... Use our tiff loader for content (de)serialization
  a6b7530... Add contentserializer tests for textures
  f08e629... Add code to load jpegs
  7dd1016... Load jpegs without gdk-pixbuf
  b7a5925... Add tests for the jpeg loader

Commits added to the branch:

  0ee3b1c... texture: Remove unused argument from vfunc (*)
  51d0d13... gltexture: release() to a texture, not a cairo_surface (*)
  9c8e464... texture: Add GdkMemoryConversion private enum (*)
  4f17f3a... texture: Add gdk_texture_download_texture() (*)
  74ce69a... gltexture: Make release() use download_texture() (*)
  c349ed9... gltexture: Implement download() via glGetTexImage() (*)
  cbe6d0d... gdk: Deprecate gdk_cairo_draw_from_gl() (*)
  5327548... texture: Add gdk_texture_download_float() (*)
  1759d27... memorytexture: Add support for HDR formats (*)
  719eafa... gl: Implement uploading and downloading HDR formats (*)
  c9d748f... testsuite: Overhaul memorytexture test (*)
  00439f9... testsuite: Rework memorytexture test some more (*)
  bcc17b3... testsuite: Add tests uploading the memorytextures (*)
  9179ebb... testsuite: Add memory test support for OpenGL up/downloads (*)
  416763b... testsuite: Add tests for gdk_texture_download_float() (*)
  b35608a... Update Hungarian translation (*)
  6bbec87... Merge branch 'wip/otte/float-textures' into 'master' (*)
  8a338b9... Add code to load and save pngs
  fdcb23e... Load pngs without gdk-pixbuf
  5e1c5f9... Save pngs without gdk-pixbuf
  b8ea990... Add tests for the png loader
  120b9ff... Add code to load and save tiff files
  a7b9aa9... Load tiffs without gdk-pixbuf
  5d008d8... Add tests for the tiff loader
  4f78c8c... Add gdk_texture_save_to_file
  85c6be7... Use our png loader for content (de)serialization
  b26bc0e... Use our tiff loader for content (de)serialization
  d150682... Add contentserializer tests for textures
  2adcdb1... Add code to load jpegs
  d09f20a... Load jpegs without gdk-pixbuf
  b0f7566... Add tests for the jpeg loader

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