Lazy load images using base URL at parse time

[Rob Buis]

The spec says to use the base url at parse time for request url, ignoring change to base url after that.
https://html.spec.whatwg.org/multipage/images.html#update-the-image-data

[Rob Buis]

Created attachment 391150 [details]
Patch

[Rob Buis]

Created attachment 391184 [details]
Patch

[Darin Adler]

Comment on attachment 391184 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=391184&action=review

> Source/WebCore/loader/ImageLoader.cpp:189
> +        auto uri = document.completeURL(sourceURI(attr));
> +        if (m_lazyImageLoadState == LazyImageLoadState::LoadImmediately)
> +            uri = m_image->url();

Seems a little strange to call this URI.

Seems wasteful to compute the URL, then check m_lazyImageLoadState, then overwrite it. I’d write this:

    URL imageURL = m_lazyImageLoadState == LazyImageLoadState::LoadImmediately
        ? m_image->url() : document.completeURL(sourceURI(attr));

But also, i think this needs  "why" comment. The concept here of "LoadImmediately" and special URL rules seems subtle and a bit tricky.

[Rob Buis]

Created attachment 391278 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 391278 [details]
Patch

Clearing flags on attachment: 391278

Committed r257054: <https://trac.webkit.org/changeset/257054>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/59627874>

[Simon Fraser (smfr)]

The relevant tests were renamed to:

html/semantics/embedded-content/the-img-element/image-loading-lazy-base-url-2.html
html/semantics/embedded-content/the-img-element/image-loading-lazy-base-url.html