Summary:
This is a long story. Awhile ago awesome Nick Lockwood (Hey Nick!) introduced a special optimization for ReactNative rendering layer called "inherited background color".
He described this idea in D2811031:
>>>
Blending semitransparent pixels against their background is fairly a fairly expensive operation on mobile GPUs. To reduce blending, React Native has a system called "background color propagation", where the background color of parent views is automatically inherited by child views unless explicitly overridden. This means that translucent pixels can be blended directly against a known background color, avoiding the need to do this dynamically on the GPU.
In practice, this is only useful for views that do their own drawing, which is basically just <Image/> and <Text/> components, and for image components it only really matters when the image has an alpha component.
The automatic background propagation is a bit of a hack, and often does the wrong thing - for example if a view overflows its bounds, or if it overlaps a sibling, the background color will often be incorrect and need to be manually disabled. Because the only place that it provides a significant performance benefit is for text, this diff disables the behavior for everything except <Text/> nodes. It might still be useful for <Image/> nodes too, but looking through the examples in UIExplorer, the number of places where it does the wrong thing for images outnumbers the cases where it provides significant reduction in blending.
However. I think it is time to remove it. Why? There are several reasons:
* It drastically complicates rendering layer. DRASTICALLY. In many many unrelated places (try search for "backgroundColor"!);
* This mechanism is totally non-conceptual to RN and it prevents us to implement some new possible render optimization that we plan to do;
* This adopted only by two components now: Text and ART;
* This is not a significant performance drain anymore; from iOS 6 even UILabel has clear background color by default.
* I doubt that it even works now because `drawRect:` in Text component does not call super method.
So, this diff just turns this feature off for Text. If all performance metrics are neutral, I will delete this mechanism.
Peace.
Reviewed By: sahrens
Differential Revision: D6564199
fbshipit-source-id: 70524fdd955ca32bbf86d2d1ff5e73316b791219
Summary:
Pass scriptURL to RCTTestRunner.
If the scriptURL passed to RCTTestRunner is not nil, then RCTTestRunner will use it.
else, RCTTestRunner will use whatever it has before.
Differential Revision: D6215186
fbshipit-source-id: c3a5643021d60579fc8e60a69de150f6a4a39237
Summary:
It makes possible to just specify remote url for the <Image> and it will work.
`<Image source={{uri: 'https://facebook.github.io/react/img/logo_og.png'}} />`
Reviewed By: javache
Differential Revision: D5196055
fbshipit-source-id: aaf139c4518cc35d1f4cf810bbf0305aad73a55b
Summary:
Now intrinsic content size of <Image> is implemented natively on iOS and now it is actually
`intrinsicContentSize`, not just overrided `height` and `width` styles (which was incorrect and hacky).
This change also removes support of nested content inside <Image>.
This is a first commit in the row where we improve <Image> implementation.
Reviewed By: mmmulani
Differential Revision: D5189017
fbshipit-source-id: eab3defa3d86a5d4219b4f4925ab7460b58d760f
Summary:
The icon size in the test/example cannot be rounded correctly as 3x image, causing redbox like:
```
-[RNTesterSnapshotTests testTabBarExample] : failed: caught "NSInternalInconsistencyException", "RedBox error: Error setting property 'icon' of RCTTabBarItem with tag #14: Image source flux@3x.png size {33, 33} does not match loaded image size {33.333333333333336, 33.333333333333336}."
```
This simply resizes them from 100x100 to 99x99
Reviewed By: javache
Differential Revision: D5747345
fbshipit-source-id: 084b4b028436b18dab324fef1fb0a4365072be75
Summary:
Adds a queue to postMessage so that messages sent close together are not lost.
Setting location="a";location="b" results in only "b" reaching shouldStartLoadWithRequest. Making the second update asynchronous with setTimeout does not fix the issue unless a delay is added.
With this update, postMessage queues "b" until it gets a "message:received" event that confirms "a" has already been processed.
The included test sends two messages from a webview and checks that both are received. It fails against the preexisting code with the first message being dropped.
Closes https://github.com/facebook/react-native/pull/11304
Differential Revision: D5481385
Pulled By: hramos
fbshipit-source-id: 9b6af195eeff8f20c820e2fcdac997c90763e840
Summary:
Fix this crash by making sure the RCTDeviceInfo is doing things on the main thread.
This fixes#14043.
Reviewed By: ashwinb
Differential Revision: D5286746
fbshipit-source-id: cce3426a6e7e7221cff82f8bca663d9a060dd358
Summary:
Flashing scroll indicators is a standard behavior on iOS to show the user there's more content.
Launch RNTester on iOS, go to the ScrollView section, tap the "Flash scroll indicators" button.
You'll see this:
I've exposed the method `flashScrollIndicators` on all scrolling components that were already exposing a `scrollToXXX` method so it's usable from those components using a ref.
Let me know what you think.
Closes https://github.com/facebook/react-native/pull/14058
Differential Revision: D5103239
Pulled By: shergin
fbshipit-source-id: caad8474fbe475065418d771b17e4ea9766ffcdc
Summary:
We found that `-[CALayer renderInContext:]` produces bad results in some cases (which is actually documented thing!),
so we decided to replace it with `-[UIView drawViewHierarchyInRect:]` which is more reliable (I hope).
As part of this change I completly removed support of `CALayer` from local fork of `RNTesterIntegrationTests`.
See https://github.com/facebook/react-native/pull/14011#issuecomment-303844580 for more details.
janicduplessis
Reviewed By: javache
Differential Revision: D5129492
fbshipit-source-id: 6a9227037c85bb8f862d55267f5301e177985ad9
Summary:
**Motivation**
The ART library is part of the react-native repo, but is not included in UIExplorer and has no native testing. This PR adds the ART library to UIExplorer, adds an example tab for it, and adds a snapshot test.
**Test plan**
New snapshot test.
Closes https://github.com/facebook/react-native/pull/13621
Differential Revision: D4954082
Pulled By: javache
fbshipit-source-id: 83e21c5df1b766ff6ca9f8914eb3382f7323627d
Valentin Shergin
Chris Zheng
Mehdi Mulani
Kevin Gozali
Pieter De Baets
Tom Clarkson
Eric Vicenti
Jean Regisser
Douglas Lowder
