225673 2021-05-11 15:09:26 -0700 Factor copyImagePixel pixel conversion code into its own file 2021-05-12 16:52:31 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 sam sam darin dino ews-watchlist fujii kondapallykalyan webkit-bug-importer oldest_to_newest 1759076 0 sam 2021-05-11 15:09:26 -0700 Factor copyImagePixel pixel conversion code into its own file 1759077 1 428315 sam 2021-05-11 15:18:28 -0700 Created attachment 428315 Patch 1759087 2 428315 darin 2021-05-11 16:00:43 -0700 Comment on attachment 428315 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428315&action=review > Source/WebCore/platform/graphics/PixelBufferConversion.h:44 > +void convertImagePixels(const PixelBufferConversionView& source, PixelBufferConversionView& destination, const IntSize&); Not so clear that destination should be non-const here. I understand that the pixels are overwritten, but is that really best expressed by passing a non-const reference to the view? In every other way, the view is an in parameter, not an out parameter. And seeing it passed as a reference doesn’t really make that clear to me. It would be a huge programming error to expect the function to set fields like destination.alphaFormat. I’m also not entirely clear why IntSize is not part of the conversion view; perhaps because it’s needed only for source and not destination? Or because it must be the same for both? Is there a better way to express this function? Any small adjustment that could make semantics a little more obvious? Maybe it would be as simple as taking the data pointer out of the view and perhaps it would have a different name then? That certainly would make the source worse, but then you could see how the source and destination const-ness differed. Should be able to use const uint8_t* for the source pixels. 1759104 3 sam 2021-05-11 17:00:07 -0700 (In reply to Darin Adler from comment #2) > Comment on attachment 428315 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=428315&action=review > > > Source/WebCore/platform/graphics/PixelBufferConversion.h:44 > > +void convertImagePixels(const PixelBufferConversionView& source, PixelBufferConversionView& destination, const IntSize&); > > Not so clear that destination should be non-const here. I understand that > the pixels are overwritten, but is that really best expressed by passing a > non-const reference to the view? In every other way, the view is an in > parameter, not an out parameter. And seeing it passed as a reference doesn’t > really make that clear to me. It would be a huge programming error to expect > the function to set fields like destination.alphaFormat. > > I’m also not entirely clear why IntSize is not part of the conversion view; > perhaps because it’s needed only for source and not destination? Or because > it must be the same for both? > > Is there a better way to express this function? Any small adjustment that > could make semantics a little more obvious? Maybe it would be as simple as > taking the data pointer out of the view and perhaps it would have a > different name then? That certainly would make the source worse, but then > you could see how the source and destination const-ness differed. > > Should be able to use const uint8_t* for the source pixels. In another project I work on, I added some similar code a little while back and the way I handled this was by having two classes: class ConstPixelBufferView; class PixelBufferView; Where ConstPixelBufferView had a `const uint8_t*` (actually, I used `const std::byte*) and PixelBufferView had a `uint8_t*` (or rather `std::byte*`). They implemented mostly the same, using a template base class, and that worked quite nicely. My plan was to start small here and work up to that. I want these views to eventually have a nice interface for iterating pixels and getting inset buffers. Do you think a ConstPixelBufferConversionView for the source, and PixelBufferConversionView for the destination would make things better here? 1759120 4 darin 2021-05-11 18:03:27 -0700 (In reply to Sam Weinig from comment #3) > Do you think a ConstPixelBufferConversionView for the source, and > PixelBufferConversionView for the destination would make things better here? Yes. And then both would be const& parameters. There may be some even better pattern, but if you had that pattern here I would have never have made any comment! 1759136 5 428335 sam 2021-05-11 18:51:14 -0700 Created attachment 428335 Patch 1759160 6 428335 darin 2021-05-11 21:35:32 -0700 Comment on attachment 428335 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428335&action=review > Source/WebCore/platform/graphics/PixelBufferConversion.h:50 > +struct PixelBufferConversionView { > + AlphaPremultiplication alphaFormat; > + DestinationColorSpace colorSpace; > + PixelFormat pixelFormat; > + unsigned bytesPerRow; > + uint8_t* rows; > +}; > + > +struct ConstPixelBufferConversionView { > + AlphaPremultiplication alphaFormat; > + DestinationColorSpace colorSpace; > + PixelFormat pixelFormat; > + unsigned bytesPerRow; > + const uint8_t* rows; > +}; To make this less repetitive, we could make a structure: struct PixelBufferFormat { }; Then we could either derive the two views from it, or have a data member of that type. It would have everything except the rows pointer. 1759250 7 ews-feeder 2021-05-12 07:51:38 -0700 Committed r277369 (237627@main): <https://commits.webkit.org/237627@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 428335. 1759252 8 webkit-bug-importer 2021-05-12 07:52:16 -0700 <rdar://problem/77908051> 1759260 9 428335 darin 2021-05-12 08:47:04 -0700 Comment on attachment 428335 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428335&action=review > Source/WebCore/platform/graphics/PixelBufferConversion.cpp:42 > +template<typename View> static inline vImage_Buffer makeVImageBuffer(const View& view, const IntSize& size) Looking over this file, I see inline a lot. And I realize that we probably haven’t discussed inline in the WebKit project enough. Here is my take on it: Using the inline keyword to guide optimization (literal "inlining"): - The inline keyword itself doesn’t guarantee inlining, nor is it typically required to make inlining possible. In the modern compilers, just having the function definition visible in the translation unit is most of what is needed to make inlining possible without a global optimization pass. - If we find that the compiler is not inlining and we want that to improve execution speed or code size, adding the inline keyword might help, but we may find that we need the ALWAYS_INLINE keyword instead. Using the inline keyword for correctness: - We need to use the inline keyword when we put a non-template function into a header so that the one-definition rule is relaxed so we can include it in multiple translation units. This also making inlining possible without global optimization, as mentioned above. - Also note that the static keyword does not need to be used in this case; using it to ask for internal linkage may be actively harmful, and affects things like the linkage of global variables defined inside the function. - The above rules do *not* apply for functions that is in a non-header, defined inside a class definition, a function template, or marked constexpr. In all those cases we don’t need inline for correctness. Given these considerations, if I was the programmer, I would have landed this patch without any of the inline keywords in this source file. 1759285 10 sam 2021-05-12 10:16:22 -0700 (In reply to Darin Adler from comment #9) > Comment on attachment 428335 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=428335&action=review > > > Source/WebCore/platform/graphics/PixelBufferConversion.cpp:42 > > +template<typename View> static inline vImage_Buffer makeVImageBuffer(const View& view, const IntSize& size) > > Looking over this file, I see inline a lot. And I realize that we probably > haven’t discussed inline in the WebKit project enough. Here is my take on it: > > Using the inline keyword to guide optimization (literal "inlining"): > - The inline keyword itself doesn’t guarantee inlining, nor is it typically > required to make inlining possible. In the modern compilers, just having the > function definition visible in the translation unit is most of what is > needed to make inlining possible without a global optimization pass. > - If we find that the compiler is not inlining and we want that to improve > execution speed or code size, adding the inline keyword might help, but we > may find that we need the ALWAYS_INLINE keyword instead. > > Using the inline keyword for correctness: > - We need to use the inline keyword when we put a non-template function into > a header so that the one-definition rule is relaxed so we can include it in > multiple translation units. This also making inlining possible without > global optimization, as mentioned above. > - Also note that the static keyword does not need to be used in this case; > using it to ask for internal linkage may be actively harmful, and affects > things like the linkage of global variables defined inside the function. > - The above rules do *not* apply for functions that is in a non-header, > defined inside a class definition, a function template, or marked constexpr. > In all those cases we don’t need inline for correctness. > > Given these considerations, if I was the programmer, I would have landed > this patch without any of the inline keywords in this source file. That seems reasonable, though I always assumed compilers used the inline keyword as a hint, though I have no basis to back that up. These seem like good rules. I copied the inline from the previous location, and didn't think about it much. I'll remove them. 1759464 11 fujii 2021-05-12 16:52:31 -0700 Filed: Bug 225725 – [WinCairo] Some webgl/2.0.0/conformance/textures/image_bitmap_from_image_data are failing after r277369 428315 2021-05-11 15:18:28 -0700 2021-05-11 18:51:12 -0700 Patch bug-225673-20210511151828.patch text/plain 36652 sam SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDI3NzM0MSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDU0IEBACisyMDIxLTA1LTExICBTYW0gV2Vp bmlnICA8d2VpbmlnQGFwcGxlLmNvbT4KKworICAgICAgICBGYWN0b3IgY29weUltYWdlUGl4ZWxz IHBpeGVsIGNvbnZlcnNpb24gY29kZSBpbnRvIGl0cyBvd24gZmlsZQorICAgICAgICBodHRwczov L2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjI1NjczCisKKyAgICAgICAgUmV2aWV3 ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgUmVtb3ZlcyB2aXJ0dWFsIEltYWdlQnVm ZmVyQmFja2VuZDo6Y29weUltYWdlUGl4ZWxzKCkgZnVuY3Rpb24gYW5kCisgICAgICAgIG1vdmVz 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