update 2021/10/16 (#219)

* update physics

* update input

* update

* update code sharing in getting-help.md

* Export Compliance

* update on file i/o

* pi / 4

* inputs

* forum url

* read only user

* html5 gamepad

* sdk api update

* update

* image properties

* update editor

* defold sdk update

* animation updates

* animation fix

* run as admin

* update bob

* update about AndroidX support

* software render

* linux-faq.md update

* 4.28.2021 updates

* Basis Universal format

* sound & mesh

* gamepad event mapping

* admob url

* Minor edit to building blocks intro text

* update gamepad & ios

* project settings

* libffi version

* scaling

* image compression

* update gamepads

* increase memory

* caching assets

* update 2021/10/6

* update 2021/10/16
blend-modes.md

docs/zh/shared/blend-modes.md

@@ -4,7 +4,10 @@ Alpha
 : 普通混合: `src.a * src.rgb + (1 - src.a) * dst.rgb`
 
 Add
-: 使用相应的 sprite 像素颜色值提亮背景: `src.rgb + dst.rgb`
+: 使用相应组件的像素颜色值提亮背景: `src.rgb + dst.rgb`
 
 Multiply
-: 使用相应的 sprite 像素颜色值调暗背景: `src.rgb * dst.rgb`
+: 使用相应组件的像素颜色值调暗背景: `src.rgb * dst.rgb`
+
+Screen
+: Multiply 的反向操作. 使用相应组件的像素颜色值提亮背景: `src.rgb - dst.rgb * dst.rgb`