Update the travis CI script and readme

Author: dreampiggy

.travis.yml

@@ -1,14 +1,38 @@
-# references:
-# * https://www.objc.io/issues/6-build-tools/travis-ci/
-# * https://github.com/supermarin/xcpretty#usage
-
-osx_image: xcode7.3
 language: objective-c
-# cache: cocoapods
-# podfile: Example/Podfile
-# before_install:
-# - gem install cocoapods # Since Travis is not always on latest version
-# - pod install --project-directory=Example
+osx_image: xcode9.4
+
+env:
+  global:
+    - LC_CTYPE=en_US.UTF-8
+    - LANG=en_US.UTF-8
+
+addons:
+  ssh_known_hosts: github.com
+
+notifications:
+  email: false
+
+before_install:
+  - env
+  - locale
+  - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
+  - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
+  - pod --version
+  - pod setup --silent > /dev/null
+  - pod repo update --silent
+  - xcpretty --version
+  - xcodebuild -version
+  - xcodebuild -showsdks
+
 script:
-- set -o pipefail && xcodebuild test -enableCodeCoverage YES -workspace Example/SDWebImageAVIFCoder.xcworkspace -scheme SDWebImageAVIFCoder-Example -sdk iphonesimulator9.3 ONLY_ACTIVE_ARCH=NO | xcpretty
-- pod lib lint
+  - set -o pipefail
+
+  - echo Check if the library described by the podspec can be built
+  # Run full subspecs linting consuming too much of build time because CocoaPods use source code of Pods
+  # Since`libx265` && `libde265` is Pod and have their own linting, don't waste time to lint full subspecs combination
+  - pod lib lint --use-libraries --allow-warnings --no-subspecs --fail-fast
+
+  - echo Build example
+  - pod install --project-directory=Example
+  - xcodebuild build -workspace Example/SDWebImageAVIFCoder.xcworkspace -scheme 'SDWebImageAVIFCoder-Example' -sdk iphonesimulator -destination 'name=iPhone 8' -configuration Debug | xcpretty -c
+  - xcodebuild build -workspace Example/SDWebImageAVIFCoder.xcworkspace -scheme 'SDWebImageAVIFCoder-Example macOS' -sdk macosx -configuration Debug | xcpretty -c

README.md

@@ -35,6 +35,18 @@ it, simply add the following line to your Podfile:
 pod 'SDWebImageAVIFCoder'
 ```
 
+Note: Current `libaom` dependency via CocoaPods, use the pre-built static library for each architecutre.
+
+The reason of this it's that we want to use SIMD/SSE/AVX2 CPU instruction optimization for each platforms. However libaom does not using dynamic CPU detection for Apple's platforms. We need the upstream to support it.
+
+At the same time, CocoaPods does not allow you to write a framework contains so much of architecture detection (for example, iPhone Simulator is x86_x64, however, iPhone is ARM, they should use different assembly files). So we use the pre-built one instead. 
+
+If you're using `use_frameworks!` in Podfile, you can check it with static framework instead.
+
+```
+pod 'SDWebImageAVIFCoder', :modular_headers => true
+```
+
 #### Carthage
 
 SDWebImageAVIFCoder is available through [Carthage](https://github.com/Carthage/Carthage).