Implement the attribute HTMLImageElement.async

[Said Abou-Hallawa]

This will force async decoding for this image all the times regardless weather the image is large or not. Async decoding will be forced even if it causes the image to flicker momentarily.

[Said Abou-Hallawa]

Created attachment 319554 [details]
Patch

[Said Abou-Hallawa]

<rdar://problem/34107641>

[Darin Adler]

Comment on attachment 319554 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=319554&action=review

> Source/WebCore/html/HTMLImageElement.cpp:227
> -    } else {
> +    } else if (name == asyncAttr)
> +        m_async = !value.isNull();

This code isn’t needed. There is no need to store a boolean in a data member just so we can ask the question of an HTMLImageElement. We can find out the correct value at any time by calling hasAttribute(asyncAttr).

> Source/WebCore/html/HTMLImageElement.h:82
> +    bool async() const { return m_async; }

This function isn’t needed. [Reflect] can answer this question without adding a function, and the one caller can just call hasAttribute(asyncAttr).

> Source/WebCore/html/HTMLImageElement.h:146
> +    bool m_async { false };

This data member isn’t needed.

> Source/WebCore/rendering/RenderBoxModelObject.cpp:330
> +    if (is<HTMLImageElement>(element()) && downcast<HTMLImageElement>(*element()).async())

Here we can just write:

    if (is<HTMLImageElement>(element()) && element()->hasAttribute(asyncAttr))

[Said Abou-Hallawa]

Created attachment 320312 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 320312 [details]
Patch

Clearing flags on attachment: 320312

Committed r221803: <http://trac.webkit.org/changeset/221803>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Simon Fraser (smfr)]

Followup to support the on/off syntax: 179432