225304 2021-05-03 07:24:49 -0700 OffscreenCanvas should preserve context transform after transferToImageBitmap 2021-05-05 06:20:54 -0700 1 1 1 Unclassified WebKit Canvas WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 183720 1 clord clord cdumez changseok darin dino esprehn+autocc ews-watchlist gyuyoung.kim webkit-bug-importer oldest_to_newest 1756168 0 clord 2021-05-03 07:24:49 -0700 As the bug title says - currently if you call transferToImageBitmap on an OffscreenCanvas, the graphics context will be reset. 1756472 1 427643 clord 2021-05-04 01:31:37 -0700 Created attachment 427643 Patch 1756477 2 clord 2021-05-04 02:23:17 -0700 Just a note, I guess there were 3 'obvious' options to fix this; 1- Figure out how to decouple GraphicsContext from ImageBuffer 2- Replay the state stack on a new GraphicsContext 3- Return a copy of the buffer instead of the original buffer I went with option 3 as it's by far the easiest, smallest and least invasive change. I played around with option 2 and it's very feasible, but it feels a bit hacky. I didn't even attempt option 1 as that seems like a pretty huge departure from how things are setup right now. The downside of option 3 is that you end up with a copy and a clear rather than just an allocate and clear, but given transferToImageBitmap isn't really expected to be fast, this doesn't seem unreasonable to me (we have similar work-arounds for similar problems elsewhere in canvas). This is one of those areas where I feel dogged adherence to the spec is actually just harming both browsers and users, but it's tested in WPT and it's pretty low effort to fix this. 1756812 3 427643 darin 2021-05-04 22:33:51 -0700 Comment on attachment 427643 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=427643&action=review > Source/WebCore/html/OffscreenCanvas.cpp:271 > + // As the canvas context state is stored in GraphicsContext, which is tightly bound > + // to buffer(), to avoid resetting the context state, we have to make a copy and > + // clear the original buffer rather than returning the original buffer. The comment "tightly bound to buffer()" seems to say that we can’t possibly get a GraphicsContext to release its current buffer and allocate a new one. Is that true, maybe due to limitations to CGGraphicsContext on Apple’s platforms, or is this simply new work we’d need to do in GraphicsContext? > Source/WebCore/html/OffscreenCanvas.cpp:272 > + ASSERT(buffer() && drawingContext()); Maybe assert these separately? But also, we don’t normally have to assert pointers are non-null; dereferencing them usually hits a null dereference quickly without us writing any additional code. And also, if we are using m_context below, and want to assert it’s not null, then we should assert that rather than drawingContext(). 1756866 4 427748 clord 2021-05-05 02:13:51 -0700 Created attachment 427748 Patch 1756873 5 clord 2021-05-05 02:33:24 -0700 (In reply to Darin Adler from comment #3) > Comment on attachment 427643 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=427643&action=review > > > Source/WebCore/html/OffscreenCanvas.cpp:271 > > + // As the canvas context state is stored in GraphicsContext, which is tightly bound > > + // to buffer(), to avoid resetting the context state, we have to make a copy and > > + // clear the original buffer rather than returning the original buffer. > > The comment "tightly bound to buffer()" seems to say that we can’t possibly > get a GraphicsContext to release its current buffer and allocate a new one. > > Is that true, maybe due to limitations to CGGraphicsContext on Apple’s > platforms, or is this simply new work we’d need to do in GraphicsContext? I've changed this comment, I don't think I picked my words well - the GraphicsContext is created and owned by the ImageBuffer and CanvasBase always accesses it through the image buffer. I think being able to release the associated surface and recreate one would involve some platform-specific plumbing that isn't currently there and may be non-trivial. It would be a lot easier to do option 2 in comment #2 than this. > > Source/WebCore/html/OffscreenCanvas.cpp:272 > > + ASSERT(buffer() && drawingContext()); > > Maybe assert these separately? > > But also, we don’t normally have to assert pointers are non-null; > dereferencing them usually hits a null dereference quickly without us > writing any additional code. > > And also, if we are using m_context below, and want to assert it’s not null, > then we should assert that rather than drawingContext(). I've just removed this assert, none of those pointers can be null at that point unless something went catastrophically wrong. m_context is checked at the start of the function and nothing is called that can destroy it, buffer() is checked just above with the !m_hasCreatedImageBuffer check and drawingContext() can only be null if m_context isn't a 2d context (it is and is checked within this block) and buffer() returns null (which shouldn't happen because m_hasCreatedImageBuffer is true). 1756876 6 ews-feeder 2021-05-05 02:49:53 -0700 Committed r277011 (237327@main): <https://commits.webkit.org/237327@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 427748. 1756878 7 webkit-bug-importer 2021-05-05 02:50:25 -0700 <rdar://problem/77548954> 427643 2021-05-04 01:31:37 -0700 2021-05-05 02:13:47 -0700 Patch bug-225304-20210504093136.patch text/plain 8765 clord U3VidmVyc2lvbiBSZXZpc2lvbjogMjc2ODk1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNmE0ZGFjNDkwNjcxZjg4 MzI4ODhiNjBmY2I1ZGRiMzYxNGNlZGNlNS4uMzA1YzcxNmQ1MjlhMGM1ZTNlMjFmMjI4NWQ5YTdk NjM4ZjFhYTE5YyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIyIEBACisyMDIxLTA1LTA0ICBDaHJp cyBMb3JkICA8Y2xvcmRAaWdhbGlhLmNvbT4KKworICAgICAgICBPZmZzY3JlZW5DYW52YXMgc2hv dWxkIHByZXNlcnZlIGNvbnRleHQgdHJhbnNmb3JtIGFmdGVyIHRyYW5zZmVyVG9JbWFnZUJpdG1h cAorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjI1MzA0 CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgdHJhbnNm 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