Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52691
Unannotated array literals are unsound in Flow right now. This diff adds in annotations and makes a few things readonly, to reduce future errors.
Changelog: [Internal]
Reviewed By: marcoww6
Differential Revision: D78519638
fbshipit-source-id: d98a7668ecf97bcc87dcb3fad25ade736d885d9a
Summary:
This change fixes an issue on iOS where gradients that fade to a transparent color-stop appear dark or "muddy." The fix ensures that the color's hue is preserved during the transition, matching the behavior on Android and web.
### The Problem
When creating a gradient on iOS (e.g., linear-gradient(red, transparent)), the transparent keyword is treated as transparent black (rgba(0,0,0,0)). The `CAGradientLayer` on iOS then interpolates all color channels linearly, causing the red, green, and blue components of the start color to fade to 0. This transition through black results in an undesirable dark or "muddy" appearance in the middle of the gradient.
## Changelog:
[IOS][FIXED] - Gradient interpolation for transparent colors
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Pull Request resolved: https://github.com/facebook/react-native/pull/52249
Test Plan:
Checkout `LinearGradient` example in RNTester, checkout the newly added transparent color transition example, it should render same on android and iOS.
| Before | After |
| --- | --- |
| <img src="https://github.com/user-attachments/assets/c0bb54ad-ed0e-4a80-b37f-0458af0f1f77" width="300"> | <img src="https://github.com/user-attachments/assets/02da921a-bd0e-45c1-881c-cf6460d5ed43" width="300"> |
| `linear-gradient(to right, red, transparent)` transitions to black on iOS, creating a dark effect. | The gradient correctly fades the red color's alpha channel to zero |
Reviewed By: javache
Differential Revision: D77312194
Pulled By: NickGerleman
fbshipit-source-id: 053df8e44f52cd22a3f28fd01f583f7d03c66af5
Summary:
This PR replaces Core Graphics implementation with Core Animation for linear gradients. I came across a great [solution](https://stackoverflow.com/questions/38821631/cagradientlayer-diagonal-gradient/43176174#43176174) that makes the `CAGradientLayer`'s start and end point behaviour CSS spec compliant. This will make gradients much more performant.
## Changelog:
[IOS] [CHANGED] - Optimised Linear Gradients.
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Pull Request resolved: https://github.com/facebook/react-native/pull/52096
Test Plan:
Non breaking change. Test Linear gradient example from RNTester. Compare results with web, android and iOS. Each platform should render the gradients identically.
## Note:
I will be doing a PR to use `CAGradientLayer` for radial gradients as well. The next properties that I have locally working are `background-size`, `background-position` and `background-repeat`. These will be addressed in small PRs.
Reviewed By: NickGerleman
Differential Revision: D76905215
Pulled By: javache
fbshipit-source-id: 0094bdf70869d619272d491dd496983316b0dbf0
Summary:
- Adds support for color transition hint syntax in linear gradients. e.g. `linear-gradient(red, 20%, green)`
- Adds `px` support. Combination of `px` and `%` also works.
- Simplified color stops parsing.
- The `processColorTransitionHint` and `getFixedColorStops` is moved to native code so it can support combination of `px` and `%` units as it requires gradient line length, which is derived from view dimensions and gradient line angle.
- Follows CSS [spec](https://drafts.csswg.org/css-images-4/#coloring-gradient-line) (Refer transition hint section) and implementation is referred from [blink engine source](https://github.com/chromium/chromium/blob/a296b1bad6dc1ed9d751b7528f7ca2134227b828/third_party/blink/renderer/core/css/css_gradient_value.cc#L240).
## Changelog:
[GENERAL] [ADDED] - Linear gradient color transition hint syntax and `px` unit support.
Pull Request resolved: https://github.com/facebook/react-native/pull/48410
Test Plan:
Added testcase in processBackgroundImage-test.ts and example in LinearGradientExample.js
<img width="500" alt="Screenshot 2025-01-05 at 11 38 13 PM" src="https://github.com/user-attachments/assets/62858bb7-1dbf-40cf-8dd4-ec0daf84ac1b" />
## Todo
Add testcases for `getFixedColorStops` and `processColorTransitionHint` in native code for both platforms. That's the only downside of moving it out of JS 🤦
Reviewed By: NickGerleman
Differential Revision: D67870375
Pulled By: joevilches
fbshipit-source-id: b91d741f3108c25df8000d220726bf180c64be60
Summary:
- Current implementation does not follow CSS spec for rectangle boxes with corner angles. It is using non spec compliant algorithm to calculate start and end points. This PR follows the spec compliant algorithm to implement and makes sure Web, iOS and Android gradients are identical with corner angles.
- Also, currently it is using `CAGradientLayer` which does not support spec compliant start and end points i.e. start and end point can be outside of rectangle bounds. This leads to inconsistent gradients on iOS for corner angles compared to web and android. So this PR replaces it with `CGGradient`.
- I have also moved some files to make it easier to add more background image types in future.
## Changelog:
[GENERAL] [FIXED] - Linear gradient start and end point algorithm.
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Pull Request resolved: https://github.com/facebook/react-native/pull/47003
Test Plan:
- Added multiple gradient example which should be identical in all platforms (Web, iOS and Android) and tested thoroughly on all platforms. I think some visual test cases can help here.
- I have referred to [blink's](https://github.com/chromium/chromium/blob/main/third_party/blink/renderer/core/css/css_gradient_value.cc) implementation.
## Aside
Took a while to understand the [spec](https://www.w3.org/TR/css-images-3/#corner-gradient-example), but felt great after getting it. Gradients should be 100% identical on all platforms now. Sorry i missed testing cornered angles + rectangles earlier and I found out it is inconsistent on platforms just this weekend 😅
<img width="1389" alt="Screenshot 2024-10-14 at 12 24 45 AM" src="https://github.com/user-attachments/assets/2f61eb87-502b-4b8c-88f3-d8a3cca9a7a3">
Reviewed By: joevilches
Differential Revision: D64497127
Pulled By: jorge-cab
fbshipit-source-id: 2647176ae2ee74b6c71f9061465b07dccdabcfc1
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47109
Fixes the `lint/sort-imports` errors that are now surfaced after fixing the lint configuration.
For a couple files, I added lint suppressions instead because the unsorted import ordering is important due to interleaved calls with side effects.
Changelog:
[Internal]
Reviewed By: GijsWeterings
Differential Revision: D64569485
fbshipit-source-id: 26415d792e2b9efe08c05d1436f723faae549882
Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46898
Replaces *many* `Text` component usages with `RNTesterText`: a thin wrapper around `Text` that applies color based on the color scheme chosen by the user. It makes text legible for dark mode across 41 different example files. This changes intentionally do not touch a few larger component sites that expand beyond RNTester, like `Animated` and `NewAppScreen`
Changelog: [Internal]
Reviewed By: rshest
Differential Revision: D64053464
fbshipit-source-id: 9516fef2afe1b364eb38e85e3a2dbb5c434e44db
Summary:
Fix platform color on android with linear gradient.
## Changelog:
[ANDROID] [FIXED] - Linear gradient with platform colors
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Pull Request resolved: https://github.com/facebook/react-native/pull/46290
Test Plan: Added example and testcases
Reviewed By: mdvacca
Differential Revision: D62277253
Pulled By: NickGerleman
fbshipit-source-id: 376ee5ebde61f3cb1ed32e82f71ad5479ebc50a5
Summary:
- Color stops needs to follow [fix up spec](https://drafts.csswg.org/css-images-4/#color-stop-fixup)
- Adds multiple stops syntax support. e.g. linear-gradient(red 30% 50%, green).
- Rename `position` to `positions` in object style API. Optional string array here makes more sense. We'll add number array support once `px` support is added. Will do it as a follow up to this PR.
TODOs: transition hint syntax support `linear-gradient(red, 50%, green)` (Done locally, dependent on this PR). `px` support.
## Changelog:
[GENERAL] [FIXED] - Linear gradient color stop spec.
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Pull Request resolved: https://github.com/facebook/react-native/pull/45969
Test Plan: - Added testcases in processBackgroundImage-test.js
Reviewed By: javache
Differential Revision: D61309203
Pulled By: NickGerleman
fbshipit-source-id: 884052c6841320048933361f38e6478ff4192736
Summary:
- Adds `background` prop that supports CSS's linear gradient. Later this can be extended to support various other gradients and possibly CSS's background image (less motivation as better solutions exists for image)
- Uses `CAGradientlayer` to draw Linear Gradient layers. So it is GPU optimised under the hood.
- Style supports JS object to specify `LinearGradient`, so it can support Animated libraries.
## Changelog:
[IOS] [ADDED] - linear gradient
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Pull Request resolved: https://github.com/facebook/react-native/pull/45434
Test Plan:
- Check out `processBackground-test.js` for supported syntax testcases.
- Checkout example added in ViewExample.js
Although the PR is tested well but open to any changes/feedback on the approach taken.
Android PR - https://github.com/facebook/react-native/pull/45433. Separated the PRs to keep it easier to review. Both PRs can be reviewed individually.
Reviewed By: NickGerleman
Differential Revision: D60791581
Pulled By: joevilches
fbshipit-source-id: 051088fdf68d9fe20c0c306f1f1c591cbd77f3d5
Summary:
- Adds `background` prop that supports CSS's linear gradient. Later this can be extended to support various other gradients and possibly CSS's background image (less motivation as better solutions exists for image)
- Extended `CSSBackgroundDrawable` to draw Linear Gradient shader while preserving the border style support.
- Style supports JS object to specify `LinearGradient`, so it can support Animated libraries.
## Changelog:
[ANDROID] [ADDED] - linear gradient
<!-- Help reviewers and the release process by writing your own changelog entry.
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Pull Request resolved: https://github.com/facebook/react-native/pull/45433
Test Plan:
- Check out `processBackground-test.js` for supported syntax testcases.
- Checkout examples added in `LinearGradientExample.js`
Although the PR is tested well but open to any changes/feedback on the approach taken.
iOS PR - https://github.com/facebook/react-native/pull/45433. Separated the PRs to keep it easier to review. Both PRs can be reviewed individually.
Reviewed By: joevilches
Differential Revision: D60493360
Pulled By: NickGerleman
fbshipit-source-id: 762929c4fe16d87cbbd9ebe83ecce96a9e13192c
Sam Zhou
nishan (o^▽^o)
Pieter De Baets
Tim Yung
Peter Abbondanzo