ios / yh_sdwebimage · Commits

- open the decoding/encoding procedures to the users
- switch from hardcoded decoding/encoding to pluginable decoders/encoders (builtin + user created)
- `SDWebImageCodersManager` is a singleton holding an array of `SDImageCoder` (protocol). Even though a singleton is not necesarily a good pattern, in this case it eliminates dealing with passing this array around
- uses a priority queue behind scenes, which means the latest added coders have priority.
- the priority is crucial when encoding/decoding something, we go through the list and ask each coder if they can handle the current data (see `canDecodeFromData:`, `canEncodeToFormat:`, `canIncrementallyDecodeFromData:`)
- each coder must conform to this protocol `SDImageCoder` describing all the required behavior for a coder
- we provide 3 built-in coders: `SDWebImageImageIOCoder` (for JPEG, PNG, TIFF), `SDWebImageGIFCoder` (for GIF), `SDWebImageWebPCoder` (for WebP and animated WebP)
- the user of SDWebImage can create custom coders by conforming to `SDImageCoder` and adding the coders to `SDWebImageCodersManager`. See `addCoder:` or `removeCoder:` or `coders` getter to get the array
- in order to preserve backwards compatibility, the UIImage categories were preserved, calling the new coders APIs described above

# Conflicts:
#	SDWebImage/SDWebImageCompat.m

Small change

Animated WebP image support loop count. Set this value to UIImage decoded with WebP data.
Frame duration set to 100ms if is zero

Clarified and simplified the usage of TARGET_OS_* macros. Added SD_MAC, SD_UIKIT, SD_IOS, SD_TV, SD_WATCH.
Updated Travis CI

…ork (pod lib lint works).
There is an issue, the SDWebImage watchOS target doesn't show the simulator, only Generic Device.
Also need to add some demo and test code.

…25. Decided to make explicit nullable and nonnull and not use NS_ASSUME_NONNULL_BEGIN so everything is clearer when read. Done so in the implementation files as well

fixes #1437

…rect image scale value