Bug 1719913 Comment 16 Edit History

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Original comment by
on 
It looks like layers have only one transform associated with them, and it gets associated with the [bottommost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/LayerMetricsWrapper.h#262) node (here, v=3).

WebRenderScrollLayerData, on the other hand, has both a "transform" and an "ancestor transform"; the former gets associated with the bottommost layer (v=3), while the latter with the [topmost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/wr/WebRenderScrollDataWrapper.h#214) layer (v=2), and in this testcase, the (0,50) is in the ancestor transform.
Revision 1 by
on 
It looks like layers have only one transform associated with them, and it gets associated with the [bottommost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/LayerMetricsWrapper.h#262) node (here, v=3).

WebRenderScrollLayerData, on the other hand, has both a "transform" and an "ancestor transform"; the former gets associated with the bottommost layer (v=3), while the latter with the [topmost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/wr/WebRenderScrollDataWrapper.h#214) layer (v=2), and the (0,50) is in the ancestor transform.
Revision 2 by
on 
It looks like layers have only one transform associated with them, and it gets associated with the [bottommost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/LayerMetricsWrapper.h#262) node (here, v=3).

WebRenderLayerScrollData, on the other hand, has both a "transform" and an "ancestor transform"; the former gets associated with the bottommost layer (v=3), while the latter with the [topmost](https://searchfox.org/mozilla-central/rev/77f0b36028b2368e342c982ea47609040b399d89/gfx/layers/wr/WebRenderScrollDataWrapper.h#214) layer (v=2), and the (0,50) is in the ancestor transform.

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