[gtk] (18 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:

  376b6ae... Add code to load and save pngs
  1e0ffc1... Load pngs without gdk-pixbuf
  c1ff0e9... Save pngs without cairo
  0254d39... Add tests for the png loader
  67e093f... Add gdk_texture_save_to_png_bytes
  5a4bbb7... Add code to load and save tiff files
  3d41f25... Redo tiff load/save without streams
  b67368a... Load tiffs without gdk-pixbuf
  13d0d7a... Add tests for the tiff loader
  185d04b... Add gdk_texture_save_to_tiff
  1b93375... Use our own loaders for content (de)serialization
  ad4c00a... Add contentserializer tests for textures
  80aa35d... Add code to load jpegs
  62cc618... Load jpegs without gdk-pixbuf
  85d3389... Add tests for the jpeg loader
  6e7c830... rendernodeparser: Use gdk_texture_save_to_png_bytes
  72ce009... rendernodeparser: Avoid gdk_texture_new_for_pixbuf
  327d0fe... texture: Add gdk_texture_save_to_tiff_bytes()
  81d0742... testsuite: Add png and tiff methods
  b67e879... png: loader set error
  6fa2e19... jpeg: Set errors
  9fa8f36... rendernodeparser: fixup
  695e94e... gdk: Add image loader deps to gdk_deps
  b303322... !fixup contentdeserializer using splice
  a8d7932... !fixup contentdeserialize jpegs
  c94477d... !fixup tiff loader fixup fixup
  dc87037... tiff loader: Set errors
  c9202a0... contentserializer: avoid an unnecessary check
  ebf335f... contentdeserializer: cosmetics
  c7efafa... png: Drop 16bit formats from saving for now
  9b52713... !fixup memorytexture even more evil by using gdk-pixbuf
  e71630c... Rewrite the png loader

Commits added to the branch:

  79eadf2... Add code to load and save pngs
  a7c587e... Load pngs without gdk-pixbuf
  57f3d9e... Save pngs without cairo
  d66ccc6... Add tests for the png loader
  616fb93... Add gdk_texture_save_to_png_bytes
  4ab87b4... Add code to load and save tiff files
  d6e79a4... Load tiffs without gdk-pixbuf
  236d589... Add tests for the tiff loader
  f9c175b... Add gdk_texture_save_to_tiff
  5e938a3... Add code to load jpegs
  771f8bf... Load jpegs without gdk-pixbuf
  722decb... Add tests for the jpeg loader
  56e9014... Use our own loaders for content (de)serialization
  c430175... Add contentserializer tests for textures
  c5b606b... rendernodeparser: Use gdk_texture_save_to_png_bytes
  14f4fe4... rendernodeparser: Avoid gdk_texture_new_for_pixbuf
  d4316c8... texture: Add gdk_texture_save_to_tiff_bytes()
  23db33e... testsuite: Add png and tiff methods