You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
Add allowsEdgeAntialiasing on views with rotations or skew tr… (#32920)
Summary:
…ansforms
On iOS, if a View is rotated with the a transform (e.g. <View style={{transform: {rotationZ: 5}}} />), the view has aliasing (see screenshot). Same for a skew transformation. We don't have the issue on Android
This behavior had originally being fixed by this PR #1999
However a new PR was merge ( #19360 ) that broke this. I think it was made to add antialiasing during perspective transforms but seems to have broken the antialiasing when rotationZ transforms
This PR adds back the antialising during rotation transform , while keeping it during perspective transform.
## Changelog
I changed the allowsEdgeAntialiasing condition, making it "true" when the m12 or m21 is not 0. From this article https://medium.com/swlh/understanding-3d-matrix-transforms-with-pixijs-c76da3f8bd8 , I've understood that in all rotation or skew transformations, m12 or m21 is different than 0 . In the other transformation (e.g. scale or translate) it stays at 0.
Although, I'm not a matrix transformation expert so I may be mistaken
Pull Request resolved: #32920
Test Plan:
I've written several views with all rotateX/Y/Z , skewX,Y and perpective transformation. Before the PR some transformation was showing aliasing on iOS (e.g. top-left view in the screenshot, don't hesitate to zoom in the image if you don't see it) and with this PR it does not have anymore
Before

After

Code I used to test
```
const commonStyle = {
width: 150,
height: 100,
backgroundColor: "red",
margin: 10,
}
const Test = () => (
<View style={{ flexDirection: "row" }}>
<View>
<View
style={[
commonStyle,
{
transform: [{ rotateZ: "4deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ rotateX: "30deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ rotateY: "30deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ rotateX: "30deg" }, { rotateY: "30deg" }, { rotateZ: "3deg" }],
},
]}
/>
</View>
<View>
<View
style={[
commonStyle,
{
transform: [{ skewX: "4deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ skewY: "4deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ skewY: "4deg" }, { rotateZ: "3deg" }],
},
]}
/>
<View
style={[
commonStyle,
{
transform: [{ perspective: 1000 }],
},
]}
/>
</View>
</View>
)
```
Reviewed By: lunaleaps
Differential Revision: D33665910
Pulled By: sshic
fbshipit-source-id: 91163ec2a0897a73ddf0310d86afacea04b89bc7
0 commit comments