Plumbing showPaintRects out of InspectorPageAgent to use a different drawing implementation if available.

Plumbing showPaintRects out of InspectorPageAgent to use a different drawing implementation if available.

Created attachment 174580 [details]
Patch

Comment on attachment 174580 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=174580&action=review

To make the showPaintRects checkbox in the Web Inspector's settings activate the paint rects in the HUDLayer, I implemented a similar plumbing than the one that was used for showFPSCounter.

> Source/WebCore/inspector/InspectorPageAgent.cpp:902
> +    if (!m_enabled || !m_state->getBoolean(PageAgentState::showPaintRects) || m_client->canShowPaintRects())

This extra check disables the painting of the paint rects into the InspectorOverlay.

> Source/WebKit/chromium/src/WebViewImpl.cpp:838
> +        return page()->settings()->forceCompositingMode();

This time a good check if the HUDLayer can draw the paint rects is necessary, because the fallback to the software paint rects needs to work. This check is the best I found so far, but it's value can change when page switches happen. This causes the paint rects then to switch between software and GPU rendering.

Created attachment 174747 [details]
Patch

caseq can you please have a look?

[WebKit Review Bot]

Please wait for approval from [e-mail], [e-mail], [e-mail], [e-mail] or [e-mail] before submitting, as this patch contains changes to the Chromium public API. See also https://trac.webkit.org/wiki/ChromiumWebKitAPI.

[Andrey Kosyakov]

Comment on attachment 174747 [details]
Patch

LGTM. Pavel?

[Pavel Feldman]

Comment on attachment 174747 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=174747&action=review

Looks good overall, couple of naming nits and it can land.

> Source/WebCore/inspector/InspectorClient.h:75
> +    virtual bool canShowPaintRects() { return false; }

So its semantics is a bit different: it tells you whether embedder should handle paint rects. I'd name it overridesShowPaintRects().

> Source/WebKit/chromium/public/WebView.h:474
> +    virtual bool canShowHUDLayer() = 0;

Should this be called isAcceleratedCompositingActive ? Just to make things more clear.

Created attachment 176055 [details]
Patch

[WebKit Review Bot]

Comment on attachment 176055 [details]
Patch

Clearing flags on attachment: 176055

Committed r135881: <http://trac.webkit.org/changeset/135881>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.