Jackson Gardner 69b2747ca3 Skwasm platform views (flutter/engine#43011) ...

This implements platform views in Skwasm. There are a number of substantial changes rolled up in this change, including:
* Reworked the rendering system to use multiple canvases with a single WebGL context, via ImageBitmap rendering.
* Reworked our object management and bindings to use the `__externref_t` construct in C code.
* Upgraded emscripten to a much newer version
* Generified skwasm's scene builder to be able to work with any renderer that can produce `ImageBitmap` objects from Pictures, and whose `Canvas`, `Picture` and `ImageFilter` objects conform to `SceneCanvas`/`ScenePicture`/`SceneImageFilter`

For platform views themselves, most stuff is implemented except for clipping. I plan on doing that in a subsequent change.

2023-08-28 16:29:14 +00:00

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src/flutter

Skwasm platform views (flutter/engine#43011)

2023-08-28 16:29:14 +00:00