227133 2021-06-17 09:47:06 -0700 Trying to take empty snapshots of the view should not cause crashes 2021-06-17 14:23:32 -0700 1 1 1 Unclassified WebKit WebKit2 WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 cdumez cdumez achristensen darin ggaren kkinnunen thorton webkit-bug-importer oldest_to_newest 1770692 0 cdumez 2021-06-17 09:47:06 -0700 Trying to take empty snapshots of the view should not cause crashes. 1770695 1 431685 cdumez 2021-06-17 09:50:38 -0700 Created attachment 431685 Returns a NSError 1770710 2 431685 ggaren 2021-06-17 10:12:39 -0700 Comment on attachment 431685 Returns a NSError View in context: https://bugs.webkit.org/attachment.cgi?id=431685&action=review > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1178 > + if (CGRectIsEmpty(rectInViewCoordinates) || !snapshotWidth) { > + RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() mutable { > + completionHandler(nil, createNSError(WKErrorUnknown).get()); > + }); > + return; > + } Is returning WKErrorUnknown better than returning an empty image? NSImage appears to support an empty image constructor, with the caveat that using the image later might cause you problems: "It is permissible to initialize the image object by passing a size of (0.0, 0.0); however, you must set the size to a non-zero value before using it or an exception will be raised." [ https://developer.apple.com/documentation/appkit/nsimage/1520033-initwithsize?language=objc ] Perhaps those problems will be clearer than WKErrorUnknown. 1770715 3 cdumez 2021-06-17 10:18:41 -0700 (In reply to Geoffrey Garen from comment #2) > Comment on attachment 431685 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=431685&action=review > > > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1178 > > + if (CGRectIsEmpty(rectInViewCoordinates) || !snapshotWidth) { > > + RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() mutable { > > + completionHandler(nil, createNSError(WKErrorUnknown).get()); > > + }); > > + return; > > + } > > Is returning WKErrorUnknown better than returning an empty image? NSImage > appears to support an empty image constructor, with the caveat that using > the image later might cause you problems: > > "It is permissible to initialize the image object by passing a size of (0.0, > 0.0); however, you must set the size to a non-zero value before using it or > an exception will be raised." [ > https://developer.apple.com/documentation/appkit/nsimage/1520033- > initwithsize?language=objc ] > > Perhaps those problems will be clearer than WKErrorUnknown. If you prefer, I can certainly do that. I tried to maintain pre-existing behavior in release builds (we would hit the assertion in debug). 1770716 4 cdumez 2021-06-17 10:25:05 -0700 (In reply to Chris Dumez from comment #3) > (In reply to Geoffrey Garen from comment #2) > > Comment on attachment 431685 [details] > > Patch > > > > View in context: > > https://bugs.webkit.org/attachment.cgi?id=431685&action=review > > > > > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1178 > > > + if (CGRectIsEmpty(rectInViewCoordinates) || !snapshotWidth) { > > > + RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() mutable { > > > + completionHandler(nil, createNSError(WKErrorUnknown).get()); > > > + }); > > > + return; > > > + } > > > > Is returning WKErrorUnknown better than returning an empty image? NSImage > > appears to support an empty image constructor, with the caveat that using > > the image later might cause you problems: > > > > "It is permissible to initialize the image object by passing a size of (0.0, > > 0.0); however, you must set the size to a non-zero value before using it or > > an exception will be raised." [ > > https://developer.apple.com/documentation/appkit/nsimage/1520033- > > initwithsize?language=objc ] > > > > Perhaps those problems will be clearer than WKErrorUnknown. > > If you prefer, I can certainly do that. I tried to maintain pre-existing > behavior in release builds (we would hit the assertion in debug). I am also unsure how to create an empty UIImage. I don't see a similar API as for NSImage. 1770717 5 cdumez 2021-06-17 10:28:14 -0700 Found in the context of rdar://79424132. 1770725 6 431692 cdumez 2021-06-17 11:03:17 -0700 Created attachment 431692 Returns an empty image 1770729 7 431692 thorton 2021-06-17 11:26:16 -0700 Comment on attachment 431692 Returns an empty image View in context: https://bugs.webkit.org/attachment.cgi?id=431692&action=review > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1180 > + completionHandler(image.get(), nil); I'm a little confused. The image param is nullable, shouldn't we just do that? (as a consumer of many cocoa APIs, that seems less surprising to me than this) 1770732 8 cdumez 2021-06-17 11:31:08 -0700 (In reply to Tim Horton from comment #7) > Comment on attachment 431692 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=431692&action=review > > > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1180 > > + completionHandler(image.get(), nil); > > I'm a little confused. The image param is nullable, shouldn't we just do > that? (as a consumer of many cocoa APIs, that seems less surprising to me > than this) So your preference would be a nil image AND a nil NSError? 1770735 9 cdumez 2021-06-17 11:34:46 -0700 (In reply to Chris Dumez from comment #8) > (In reply to Tim Horton from comment #7) > > Comment on attachment 431692 [details] > > Patch > > > > View in context: > > https://bugs.webkit.org/attachment.cgi?id=431692&action=review > > > > > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1180 > > > + completionHandler(image.get(), nil); > > > > I'm a little confused. The image param is nullable, shouldn't we just do > > that? (as a consumer of many cocoa APIs, that seems less surprising to me > > than this) > > So your preference would be a nil image AND a nil NSError? Our documentation says "The completionHandler is passed the image of the viewport contents or an error." My first patch was passing an error, my second one is passing an empty image. I think either would be fine but we need to agree on something and fix the crashes on the bots :) 1770739 10 thorton 2021-06-17 11:38:04 -0700 (In reply to Chris Dumez from comment #9) > (In reply to Chris Dumez from comment #8) > > (In reply to Tim Horton from comment #7) > > > Comment on attachment 431692 [details] > > > Patch > > > > > > View in context: > > > https://bugs.webkit.org/attachment.cgi?id=431692&action=review > > > > > > > Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm:1180 > > > > + completionHandler(image.get(), nil); > > > > > > I'm a little confused. The image param is nullable, shouldn't we just do > > > that? (as a consumer of many cocoa APIs, that seems less surprising to me > > > than this) > > > > So your preference would be a nil image AND a nil NSError? > > Our documentation says "The completionHandler is passed the image of the > viewport contents or an error." > > My first patch was passing an error, my second one is passing an empty > image. I think either would be fine but we need to agree on something and > fix the crashes on the bots :) Ahaa, fair :) I think either is definitely fine. 1770742 11 thorton 2021-06-17 11:39:05 -0700 I guess.. you did ask for an empty image, and you got an empty image, so I will r+ that one. 1770804 12 ews-feeder 2021-06-17 13:48:52 -0700 Committed r279006 (238931@main): <https://commits.webkit.org/238931@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 431692. 1770806 13 webkit-bug-importer 2021-06-17 13:49:29 -0700 <rdar://problem/79468888> 1770817 14 ggaren 2021-06-17 14:23:32 -0700 > I guess.. you did ask for an empty image, and you got an empty image FWIW, that was my thinking too. 431685 2021-06-17 09:50:38 -0700 2021-06-17 11:39:29 -0700 Returns a NSError bug-227133-20210617095037.patch text/plain 7220 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjc4OTg2CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDk5NjY3Yjg0MTlmYTMyNTIz NWM3NWMwOThjNDNiNjIyMDk0NzUwMmYuLjdmNWQ1OWYyZTE0NTM5ZDAyNzIyMGU4OTU1ZDI0NjA4 MDZhZWUwYzAgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTggQEAKKzIwMjEtMDYtMTcgIENocmlzIER1 bWV6ICA8Y2R1bWV6QGFwcGxlLmNvbT4KKworICAgICAgICBUcnlpbmcgdG8gdGFrZSBlbXB0eSBz bmFwc2hvdHMgb2YgdGhlIHZpZXcgc2hvdWxkIG5vdCBjYXVzZSBjcmFzaGVzCisgICAgICAgIGh0 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