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(I'm the author of the blog post) Yes, WebRender could repack it's texture atlases. A lot of stuff of various sizes go in there so I would not want to rely on repacking large amounts of pixels frequently but it could, among other things, help with more quickly converging back to a single texture atlas after an allocation spike. To my knowledge WebRender cannot move data within a texture using the OpenGL version it's restricted to.

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Just wanted to let you know that you converged on the same solution (nested 1d allocators) that I came up with for Google Maps back in 2013ish.

We also made heavy use of allocation bitmaps and a few other tricks to ensure that the texture allocator does zero dynamic memory allocation at runtime, as that could cause performance bubbles.

Oh, and we had similar visualizers for atlas usage but they were live views in a popup window rendered via canvas.

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