53197 2011-01-26 15:22:30 -0800 Make WebKit2 printing asynchronous 2011-01-27 11:38:37 -0800 1 1 1 Unclassified WebKit Printing 528+ (Nightly build) All All RESOLVED FIXED InRadar P2 Normal --- 1 ap ap andersca buildbot mitz sam webkit-ews webkit.review.bot oldest_to_newest 340515 0 ap 2011-01-26 15:22:30 -0800 Print preview still blocks the UI process, even with WebKit2. It shouldn't. <rdar://problem/8895682> 340538 1 80250 ap 2011-01-26 15:57:51 -0800 Created attachment 80250 proposed patch 340540 2 ap 2011-01-26 15:58:09 -0800 This will temporarily break window.print(). 340569 3 80250 darin 2011-01-26 16:29:49 -0800 Comment on attachment 80250 proposed patch View in context: https://bugs.webkit.org/attachment.cgi?id=80250&action=review There is some really fragile stuff here, with various assumptions about AppKit. I wonder what we can do to reduce the assumptions and tighten it up. > Source/WebKit2/UIProcess/GenericCallback.h:121 > + RefPtr<WebError> error = WebError::create(); > + m_callback(Vector<WebCore::IntRect>(), 0, toAPI(error.get()), m_context); I don’t think you need a local variable for “error”. > Source/WebKit2/UIProcess/WebPageProxy.cpp:2197 > + // FIXME: Log error or assert. I think we probably want to taint the web process here rather than logging an error or asserting. The same thing we do with bad frame IDs, for example. Or maybe I have this backwards. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.h:-39 > - Vector<WebCore::IntRect> _webPrintingPageRects; > - double _webTotalScaleFactorForPrinting; Were the “web” prefixes here an attempt to avoid conflicting with AppKit field names? The rules about who gets to use underscore-prefixed identifiers are unclear! Maybe we shouldn’t use underscores at all since this is a private class and the issue is conflict with AppKit, not with framework clients. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.h:42 > + HashMap<WebCore::IntRect, Vector<uint8_t> > _pagePreviews; A typedef for this HashMap could make the code below easier to read. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.h:48 > + HashMap<uint64_t, WebCore::IntRect> _expectedPreviewCallbacks; Ditto. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:132 > +static void pageDidDrawToPDF(WKDataRef dataRef, WKErrorRef, void* ctx) There must be a better name than ctx. I think I used the name untypedContext somewhere for this. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:156 > + (*entry.first).second.append(data->bytes(), data->size()); You can use an arrow here instead of (*x). and I think it’s easier to read. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:187 > + if (lastPage > _printingPageRects.size()) // Last page is NSIntegerMax if not set by the user. NSIntegerMax won’t fit in an unsigned. I guess we get the max unsigned? > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:195 > + RefPtr<DataCallback> cb = DataCallback::create(context, pageDidDrawToPDF); How about splurging on a few extra letters and calling this callback instead of cb? > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:204 > +static void pageDidComputePageRects(const Vector<WebCore::IntRect>& pageRects, double totalScaleFactorForPrinting, WKErrorRef, void* ctx) Still not a fan of ctx. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:208 > + IPCCallbackContext* context = static_cast<IPCCallbackContext*>(ctx); Other people have been using OwnPtr and adoptPtr instead of delete. This allows you to do things like early returns if you like. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:244 > + IPCCallbackContext* context = new IPCCallbackContext; Maybe it’s a bit stilted, but I like the idea of using OwnPtr and leakPtr instead of raw pointers. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:245 > + RefPtr<ComputedPagesCallback> cb = ComputedPagesCallback::create(context, pageDidComputePageRects); Again, I prefer the full word name, callback. > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:250 > + _webFrame->page()->computePagesForPrinting(_webFrame.get(), PrintInfo([_printOperation printInfo]), cb.get()); Should be release, not get, here. 340577 4 buildbot 2011-01-26 16:37:11 -0800 Attachment 80250 did not build on win: Build output: http://queues.webkit.org/results/7501331 340604 5 webkit-ews 2011-01-26 17:09:27 -0800 Attachment 80250 did not build on qt: Build output: http://queues.webkit.org/results/7565387 340721 6 webkit.review.bot 2011-01-26 22:30:32 -0800 Attachment 80250 did not build on mac: Build output: http://queues.webkit.org/results/7614364 340921 7 ap 2011-01-27 10:28:26 -0800 > There is some really fragile stuff here, with various assumptions about AppKit. > I wonder what we can do to reduce the assumptions and tighten it up. Definitely agreed - hopefully, we can make it better when APIs we requested are added. > > Source/WebKit2/UIProcess/API/mac/WKPrintingView.h:42 > > + HashMap<WebCore::IntRect, Vector<uint8_t> > _pagePreviews; > > A typedef for this HashMap could make the code below easier to read. This is one WebKit coding style pattern that frequently annoys me. Whenever I go to a header file to look what a compound member variable is, I have to also hunt down its type's typedef. On the other hand, while an iterator type like "HashMap<WebCore::IntRect, Vector<uint8_t> >::iterator" adds significant visual noise, it's not something you need to actually read and understand as long as compiler doesn't complain. > Other people have been using OwnPtr and adoptPtr instead of delete. This allows you to do things like early returns if you like. Done, looks nice. > > Source/WebKit2/UIProcess/API/mac/WKPrintingView.mm:244 > > + IPCCallbackContext* context = new IPCCallbackContext; > > Maybe it’s a bit stilted, but I like the idea of using OwnPtr and leakPtr instead of raw pointers. This one doesn't look so nice in this case - the context is passed to ComputedPagesCallback::create(), but then it's also changed. I would either have to call leakPtr later, or access context indirectly. Neither is beautiful. OwnPtr<IPCCallbackContext> context = adoptPtr(new IPCCallbackContext); RefPtr<ComputedPagesCallback> callback = ComputedPagesCallback::create(context.leakPtr(), pageDidComputePageRects); _expectedComputedPagesCallback = callback->callbackID(); callback->context->view = self; // Why not use context here? callback->context->callbackID = _expectedComputedPagesCallback; // Ditto. 340972 8 ap 2011-01-27 11:38:37 -0800 Committed <http://trac.webkit.org/changeset/76821>. I also took out beginPrinting() change - I'm no longer sure that implicitly beginning printing when drawing PDF is a good idea. Layout is time consuming, and the client knows better when something changes that requires relayout. 80250 2011-01-26 15:57:51 -0800 2011-01-26 16:29:48 -0800 proposed patch AsyncPrinting.txt text/plain 48270 ap SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDc2NzI2KQorKysgU291cmNlL1dlYkNvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMTUgQEAKKzIwMTEtMDEtMjYgIEFsZXhleSBQ cm9za3VyeWFrb3YgIDxhcEBhcHBsZS5jb20+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZ IChPT1BTISkuCisKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dp P2lkPTUzMTk3CisgICAgICAgIDxyZGFyOi8vcHJvYmxlbS84ODk1NjgyPiBNYWtlIFdlYktpdDIg cHJpbnRpbmcgYXN5bmNocm9ub3VzCisKKyAgICAgICAgKiBXZWJDb3JlLmV4cC5pbjogRXhwb3J0 IG1vcmUgUHJpbnRDb250ZXh0IG1ldGhvZHMgdGhhdCB3ZSBkaWRuJ3QgdXNlIG9uIE1hYyBiZWZv cmUuCisKKyAgICAgICAgKiBwYWdlL1ByaW50Q29udGV4dC5jcHA6IChXZWJDb3JlOjpQcmludENv 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