[gtk] (36 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:

  7bafbef... Add gdk_texture_new_from_bytes
  13d72ee... Add code to load and save pngs
  bc0d315... Load pngs without gdk-pixbuf
  4f18a34... Save pngs without cairo
  4c64111... Add tests for the png loader
  2568611... Add gdk_texture_save_to_png_bytes
  0c9faea... Add code to load and save tiff files
  b8ee987... Load tiffs without gdk-pixbuf
  9000118... Add tests for the tiff loader
  ee7f2f9... Add gdk_texture_save_to_tiff
  b66fa84... Use our own loaders for content (de)serialization
  f89be80... Add contentserializer tests for textures
  6a83d38... Add code to load jpegs
  0f7c33f... Load jpegs without gdk-pixbuf
  92873e6... Add tests for the jpeg loader
  65a1804... rendernodeparser: Use gdk_texture_save_to_png_bytes
  f1a8c95... stack: Dispose children before emitting items-changed
  4fad97d... Redo tiff load/save without streams
  40d81f5... !fixup can't fail
  31fc5a5... !fixup tiff save can't fail
  874a383... texture: Add gdk_texture_save_to_tiff_bytes()
  0cb0fc8... testsuite: Add png and tiff methods
  08bd112... !fixup gdk_pixbuf_save_to_png_bytes() documentation
  9d30372... rendernodeparser: Avoid gdk_texture_new_for_pixbuf
  57b419e... texture: Add error enum
  30d21ef... png: loader set error
  91e19bc... jpeg: Set errors
  f6196d3... rendernodeparser: fixup
  2138b2c... gdk: Add image loader deps to gdk_deps
  ab69781... !fixup contentdeserializer using splice
  54fef7a... !fixup contentdeserialize jpegs
  10eb152... !fixup tiff loader fixup fixup
  ec87247... tiff loader: Set errors
  4c49733... contentserializer: avoid an unnecessary check
  ecfa4d6... contentdeserializer: cosmetics
  84b969d... png: Drop 16bit formats from saving for now
  b6ba7a0... !fixup memorytexture even more evil by using gdk-pixbuf

Commits added to the branch:

  cdc1fa1... stack: Dispose children before emitting items-changed (*)
  2a12a3e... Merge branch 'fix_#4255' into 'master' (*)
  693dd10... Add gdk_texture_new_from_bytes
  fb6a141... texture: Add error enum
  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

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