[skottie] Fix camera/3D layer transform interactions
Currently, the camera view transform is attached to the render tree as a
TransformEffect. This means it gets "flattened" to an SkMatrix in isolation,
and does not compose with other layer transforms in 4x4 format.
Refactor the implementation to
- build the camera transform upfront
- compose (chain) all layer transforms from this camera transform
This ensures that transform composition happens in SkMatrix44.
E.g. render tree topology change (TE == TransformEffect)
Before:
[root]
|
[TE]<---[CameraT]
|
------------------------------------
| |
| |
[TE]<--[Layer1T] [Layer2T]-->[TE]
| |
[Layer1] [Layer2]
| |
After:
[root]
|
|
------------------------------------
| |
| [CameraT] |
| / \ |
[TE]<--[Layer1T]<-- --->[Layer2T]-->[TE]
| |
[Layer1] [Layer2]
| |
TBR=
Bug: skia:8914
Change-Id: Idd407712f75c48623b5299a4284ddb17b98c155f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249217
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
3 files changed