Android rendering artefact not working correctly

[MorneBitcube]

Description

I'm using a custom component to render an SVG path with rounded caps. It works fine on iOS. But on Android, it causes a weird render artefact. See image below

This only occurs when 4 or more SVGs in separate canvases are stacked on top of each other

Version

1.2.0

Steps to reproduce

• Add the given code to react-native code base and build the app on Android.

Snack, code example, screenshot, or link to a repository

• The ring component

import * as React from "react"
import { useEffect } from "react"
import { observer } from "mobx-react-lite"
import { Easing, useSharedValue, withDelay, withTiming } from "react-native-reanimated"
import { Canvas, Color, Path, Skia } from "@shopify/react-native-skia"
import { View } from "react-native"

export type RingSizePreset = keyof typeof $sizePresets

export interface RingProgressProps {
  progress: number
  size: RingSizePreset
  color: Color
  canvasSize: number
}

function degToRad(degrees: number): number {
  return degrees * (Math.PI / 180)
}

export const RingProgress = observer(function RingProgress(props: RingProgressProps) {
  const { progress, size, color, canvasSize } = props

  const { width, startAngleDeg, endAngleDeg } = $sizePresets[size]

  const progressValue = useSharedValue(0)
  useEffect(() => {
    progressValue.value = withDelay(
      100,
      withTiming(progress, { duration: 700, easing: Easing.elastic(1) }),
    )
  }, [progress])

  const strokeWidth = 25
  const center = canvasSize / 2
  const r = (width + canvasSize - strokeWidth * 2) / 2
  const startAngle = degToRad(startAngleDeg)
  const endAngle = degToRad(endAngleDeg)

  const x1 = center - r * Math.cos(endAngle)
  const y1 = -r * Math.sin(endAngle) + center
  const x2 = center - r * Math.cos(startAngle)
  const y2 = -r * Math.sin(startAngle) + center

  const backgroundPath = `M ${x1} ${y1} A ${r} ${r} 0 1 0 ${x2} ${y2}`
  const foregroundPath = `M ${x2} ${y2} A ${r} ${r} 0 1 1 ${x1} ${y1}`

  const skiaBackgroundPath = Skia.Path.MakeFromSVGString(backgroundPath)
  const skiaForegroundPath = Skia.Path.MakeFromSVGString(foregroundPath)

  if (!skiaBackgroundPath || !skiaForegroundPath) {
    return <View />
  }
  return (
    <Canvas
      style={{
        width: canvasSize,
        height: canvasSize,
        position: "absolute",
      }}
    >
      <Path
        path={skiaBackgroundPath}
        strokeCap={"round"}
        strokeWidth={strokeWidth}
        style={"stroke"}
        color={color}
        opacity={0.1}
      />

      <Path
        path={skiaForegroundPath}
        strokeCap={"round"}
        strokeWidth={strokeWidth}
        start={0}
        end={progressValue}
        style={"stroke"}
        color={color}
      />
    </Canvas>
  )
})

const $sizePresets = {
  extraSmall: {
    width: -180,
    startAngleDeg: -70,
    endAngleDeg: 250,
  },
  small: {
    width: -120,
    startAngleDeg: -72,
    endAngleDeg: 252,
  },
medium: { width: -60, startAngleDeg: -74, endAngleDeg: 254 },
  large: { width: 0, startAngleDeg: -76, endAngleDeg: 256 },
}

• Implement the component for use

 export const ProgressRings = () => {

const dataList = [
  { 
    id: 1,
    progress: 0,
    name: "FirstRing",
   size: 'extraSmall',
   color: 'blue'
  },
  {
    id: 2,
    progress: 0.5,
    name: "SecondRing",
    size: 'small',
    color: 'red'
  },
  {
    id: 3,
    progress: 0.5,
    name: "Third",
    size: 'medium',
    color: 'red'
  },
  {
    id: 4,
    progress: 0.5,
    name: "Fourth",
    size: 'large',
    color: 'red'
  },
]

  const $canvasContainer: ViewStyle = {
    width: 400,
    height: 400,
    alignItems: "center",
    justifyContent: "center",
  }

  return (
    <View style={$canvasContainer}>
      {dataList.map((item) => (
        <RingProgress
          color={item.color}
          size={item.size}
          progress={item.progress}
          canvasSize={400}
          key={item.id}
        />
      ))}
    </View>
  )
})

[wcandillon]

Could you provide me with a way to reproduce the issue on my side? A standalone example file would be great. Then we can add it to the test suite.

…

On Thu, May 9, 2024 at 11:46 AM MorneBitcube ***@***.***> wrote: Description I'm using a custom component to render an SVG path with rounded caps. It works fine on iOS. But on Android, it causes a weird render artefact. See image below 1715247013733.jpg (view on web) 1715247090433.jpg (view on web) This only occurs when 4 or more SVGs in separate canvases are stacked on top of each other Version 1.2.0 Steps to reproduce Add the given code to react-native code base and build the app on Android. Snack, code example, screenshot, or link to a repository The ring component import * as React from "react" import { useEffect } from "react" import { observer } from "mobx-react-lite" import { Easing, useSharedValue, withDelay, withTiming } from "react-native-reanimated" import { Canvas, Color, Path, Skia } from ***@***.***/react-native-skia" import { View } from "react-native" export type RingSizePreset = keyof typeof $sizePresets export interface RingProgressProps { progress: number size: RingSizePreset color: Color canvasSize: number } function degToRad(degrees: number): number { return degrees * (Math.PI / 180) } export const RingProgress = observer(function RingProgress(props: RingProgressProps) { const { progress, size, color, canvasSize } = props const { width, startAngleDeg, endAngleDeg } = $sizePresets[size] const progressValue = useSharedValue(0) useEffect(() => { progressValue.value = withDelay( 100, withTiming(progress, { duration: 700, easing: Easing.elastic(1) }), ) }, [progress]) const strokeWidth = 25 const center = canvasSize / 2 const r = (width + canvasSize - strokeWidth * 2) / 2 const startAngle = degToRad(startAngleDeg) const endAngle = degToRad(endAngleDeg) const x1 = center - r * Math.cos(endAngle) const y1 = -r * Math.sin(endAngle) + center const x2 = center - r * Math.cos(startAngle) const y2 = -r * Math.sin(startAngle) + center const backgroundPath = `M ${x1} ${y1} A ${r} ${r} 0 1 0 ${x2} ${y2}` const foregroundPath = `M ${x2} ${y2} A ${r} ${r} 0 1 1 ${x1} ${y1}` const skiaBackgroundPath = Skia.Path.MakeFromSVGString(backgroundPath) const skiaForegroundPath = Skia.Path.MakeFromSVGString(foregroundPath) if (!skiaBackgroundPath || !skiaForegroundPath) { return <View /> } return ( <Canvas style={{ width: canvasSize, height: canvasSize, position: "absolute", }} > <Path path={skiaBackgroundPath} strokeCap={"round"} strokeWidth={strokeWidth} style={"stroke"} color={color} opacity={0.1} /> <Path path={skiaForegroundPath} strokeCap={"round"} strokeWidth={strokeWidth} start={0} end={progressValue} style={"stroke"} color={color} /> </Canvas> ) }) const $sizePresets = { extraSmall: { width: -180, startAngleDeg: -70, endAngleDeg: 250, }, small: { width: -120, startAngleDeg: -72, endAngleDeg: 252, }, medium: { width: -60, startAngleDeg: -74, endAngleDeg: 254 }, large: { width: 0, startAngleDeg: -76, endAngleDeg: 256 }, } Implement the component for use export const ProgressRings = () => { const dataList = [ { id: 1, progress: 0, name: "FirstRing", size: 'extraSmall', color: 'blue' }, { id: 2, progress: 0.5, name: "SecondRing", size: 'small', color: 'red' }, { id: 3, progress: 0.5, name: "Third", size: 'medium', color: 'red' }, { id: 4, progress: 0.5, name: "Fourth", size: 'large', color: 'red' }, ] const $canvasContainer: ViewStyle = { width: 400, height: 400, alignItems: "center", justifyContent: "center", } return ( <View style={$canvasContainer}> {dataList.map((item) => ( <RingProgress color={item.color} size={item.size} progress={item.progress} canvasSize={400} key={item.id} /> ))} </View> ) }) — Reply to this email directly, view it on GitHub or unsubscribe. You are receiving this email because you are subscribed to this thread. Triage notifications on the go with GitHub Mobile for iOS or Android.

[MorneBitcube]

@wcandillon As requested here is a single file
rings.tsx.zip

[MorneBitcube]

@wcandillon have you managed to reproduce this issue yet? I have tried to fix this on my side but was not successful.