[iOS][WebKit2] Provide generic software-snapshotting API

• Component: WebKit2
• Status: RESOLVED FIXED

[Tim Horton]

We should provide a single method on WKWebView that does an async software paint of a given rect in view space into an image of a given size.

<rdar://problem/16005957>

[Tim Horton]

Created attachment 227078 [details]
patch

[Ian Henderson]

Comment on attachment 227078 [details]
patch

View in context: https://bugs.webkit.org/attachment.cgi?id=227078&action=review

> Source/WebKit2/UIProcess/API/Cocoa/WKWebView.mm:361
> +        if (!imageHandle.isNull()) {
> +            RefPtr<WebKit::ShareableBitmap> bitmap = WebKit::ShareableBitmap::create(imageHandle, WebKit::SharedMemory::ReadOnly);
> +
> +            if (bitmap) {
> +                RetainPtr<CGImageRef> cgImage;
> +                cgImage = bitmap->makeCGImage();
> +                copiedCompletionHandler(cgImage.get());
> +            }
> +        }
> +
> +        [copiedCompletionHandler release];

Clients should be able to rely on the completion handler being called, even if something went wrong.  Could we call the completion handler with a nil argument in this case instead of not calling it at all?

[Tim Horton]

Created attachment 227116 [details]
patch

[WebKit Commit Bot]

Attachment 227116 [details] did not pass style-queue:


ERROR: Source/WebKit2/WebProcess/WebPage/WebPage.h:425:  The parameter name "rect" adds no information, so it should be removed.  [readability/parameter_name] [5]
ERROR: Source/WebKit2/WebProcess/WebPage/WebPage.h:425:  The parameter name "options" adds no information, so it should be removed.  [readability/parameter_name] [5]
Total errors found: 2 in 10 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Tim Horton]

Created attachment 227151 [details]
ignore this patch

[Sam Weinig]

Comment on attachment 227151 [details]
ignore this patch

This might build, but it is attached to the wrong bug.

[Tim Horton]

(In reply to comment #6)
> (From update of attachment 227151 [details])
> This might build, but it is attached to the wrong bug.

Re r?'d the relevant patch.

[Tim Horton]

http://trac.webkit.org/changeset/165872