Andreas Kling 5ed66cb8d9 LibWeb: Start building a new Resource class to share more resources ...

A Resource represents a resource that we're loading, have loaded or
will soon load. Basically, it's a downloadable resource that can be
shared by multiple clients.

A typical usecase is multiple <img> elements with the same src.
In a future patch, we will try to make sure that those <img> elements
get the same Resource if possible. This will reduce network usage,
memory usage, and CPU usage. :^)

For now, this first patch simply introduces the mechanism.

You get a Resource by calling ResourceLoader::load_resource().
To get notified about changes to a Resource's load status, you inherit
from ResourceClient and implement the callbacks you're interested in.

This patch turns HTMLImageElement into a ResourceClient.

2020-06-01 21:36:43 +02:00

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