Source/WebCore/css/DOMCSSPaintWorklet.cpp

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *
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#include "config.h"
#include "DOMCSSPaintWorklet.h"

#if ENABLE(CSS_PAINTING_API)

#include "DOMCSSNamespace.h"
#include "Document.h"
#include "PaintWorkletGlobalScope.h"
#include "WorkletGlobalScopeProxy.h"
#include <wtf/text/WTFString.h>

namespace WebCore {

PaintWorklet& DOMCSSPaintWorklet::ensurePaintWorklet(Document& document)
{
    return document.ensurePaintWorklet();
}

DOMCSSPaintWorklet* DOMCSSPaintWorklet::from(DOMCSSNamespace& css)
{
    auto* supplement = static_cast<DOMCSSPaintWorklet*>(Supplement<DOMCSSNamespace>::from(&css, supplementName()));
    if (!supplement) {
        auto newSupplement = makeUnique<DOMCSSPaintWorklet>(css);
        supplement = newSupplement.get();
        provideTo(&css, supplementName(), WTFMove(newSupplement));
    }
    return supplement;
}

const char* DOMCSSPaintWorklet::supplementName()
{
    return "DOMCSSPaintWorklet";
}

// FIXME: Get rid of this override and rely on the standard-compliant Worklet::addModule() instead.
void PaintWorklet::addModule(const String& moduleURL, WorkletOptions&&, DOMPromiseDeferred<void>&& promise)
{
    auto* document = this->document();
    if (!document) {
        promise.reject(Exception { InvalidStateError, "This frame is detached"_s });
        return;
    }

    // FIXME: We should download the source from the URL
    // https://bugs.webkit.org/show_bug.cgi?id=191136
    auto maybeContext = PaintWorkletGlobalScope::tryCreate(*document, ScriptSourceCode(moduleURL));
    if (UNLIKELY(!maybeContext)) {
        promise.reject(Exception { OutOfMemoryError });
        return;
    }
    auto context = maybeContext.releaseNonNull();
    context->evaluate();

    Locker locker { context->paintDefinitionLock() };
    for (auto& name : context->paintDefinitionMap().keys())
        document->setPaintWorkletGlobalScopeForName(name, context.copyRef());
    promise.resolve();
}

Vector<Ref<WorkletGlobalScopeProxy>> PaintWorklet::createGlobalScopes()
{
    // FIXME: Add implementation.
    return { };
}

}
#endif