Bug 87694 – [CSS] Move StyleResolver::canShareStyleWithElement to StyledElement as virtual method

• Component: CSS
• Status: RESOLVED CONFIGURATION CHANGED

I would like to move StyleResolver::canShareStyleWithElement to StyleElement class as virtual method.
The reasons are:

1. Move hasTagName checking to class which implements element. This also removes some #if, e.g. ENABLE(PROGRESS_TAG)
2. Control sharing in fine grain, e.g. if (element->hasTagName(optionTag)) return false is too conservative.



Call site changes are:

inline StyledElement* StyleResolver::findSiblingForStyleSharing(Node* node, unsigned& count) const
{
    for (; node; node = node->previousSibling()) {
        if (!node->isStyledElement())
            continue;
NOW:    if (canShareStyleWithElement(static_cast<StyledElement*>(node)))
NEW:    if (m_element->canShareStyleWithElement(static_cast<StyledElement*>(node))) 
            break;
   ....
}

[Eric Seidel (no email)]

canShareStyleWith is an insanity-hot function.  I do not recommend this approach, unless you're finding ways to avoid calling it.

[Brent Fulgham]

This code has been significantly refactored since this patch was proposed. There doesn't seem to be any action we can take here.