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LibWeb: Start building a new Resource class to share more resources

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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.
This commit is contained in:
Andreas Kling 2020-06-01 21:33:23 +02:00
parent 7be9cf8d36
commit 5ed66cb8d9
8 changed files with 274 additions and 23 deletions
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3
Libraries/LibWeb/Loader/ResourceLoader.h
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@ -29,6 +29,7 @@
#include <AK/Function.h>
#include <AK/URL.h>
#include <LibCore/Object.h>
#include <LibWeb/Forward.h>
namespace Protocol {
class Client;
@ -41,6 +42,8 @@ class ResourceLoader : public Core::Object {
public:
static ResourceLoader& the();
RefPtr<Resource> load_resource(const URL&);
void load(const URL&, Function<void(const ByteBuffer&, const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers)> success_callback, Function<void(const String&)> error_callback = nullptr);
void load_sync(const URL&, Function<void(const ByteBuffer&, const HashMap<String, String, CaseInsensitiveStringTraits>& response_headers)> success_callback, Function<void(const String&)> error_callback = nullptr);