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takopus

SVG 'leaking' bug with WebGL renderer on Apple devices

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Some time ago there was a bug report of a problem with rendering SVGs in iOS and MacOS, at least older ones. You can see it there: https://github.com/pixijs/pixi.js/issues/3433, but here is a short description as far as I've digged it. On some old Apple devices, iPad 4 / iOS 10 for me, if you load a number of SVGs, make sprites of them and place said sprites on stage, some of these sprites will 'leak' on one another. For example, if you load a green rectangle SVG and then blue circle SVG, sprite made from second one will contain expected circle drawn above unexpected rectangle. This is an old bug still found in v5.0.0 rc-3.

Sadly, I found no solution to it. There are cases when it shows and cases when it doesn't, but no way to be sure. Since it is crusial for the project I'm working on, I've made a short test code to check if the current device have this bug, so I can switch to PNGs. In case anyone needs this, you can see it below. It is written for Pixi v5.0.0 rc-3

https://codepen.io/takopus/pen/EJpjXL

The idea is simple: I load assets - rectangle and circle - make sprites, place them on stage and render it (you have to do it to catch the bug). Then I extract circle into Uint8ClampedArray of pixels and get alpha value of some corner pixel. If there is no bug, it will be 0 (since there is no pixel there). If the bug is here, it will be 255 cause of rectangle rendered below the circle.

Hope this will help someone until this bug gets fixed!

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