[Impeller] Emplace directly into host buffer (avoid VBB) for text data #42484
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impeller/core/host_buffer.h
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| /// | ||
| /// @return The buffer view. | ||
| /// | ||
| BufferView EmplaceCallback(size_t length, |
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Nit: I'd rather just take advantage of function overloading and use the name Emplace.
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I suspect we will only use this sparingly for performance but its good to have the open as needed.
impeller/core/host_buffer.h
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| using EmplaceProc = std::function<void(uint8_t* buffer)>; | ||
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| //---------------------------------------------------------------------------- | ||
| /// @brief Emplace non-uniform data (like contiguous vertices) onto the |
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"Emplaces undefined data onto the managed buffer and gives the caller a chance to update it using the specified callback. The buffer is guaranteed to have enough space for length bytes. It is the responsibility of the caller to not exceed the bounds of the buffer returned in the EmplaceProc.".
| return {}; | ||
| } | ||
| generation_++; | ||
| cb(GetBuffer() + old_length); |
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Emplace and EmplaceCallback can be dried up by making Emplace call EmplaceCallback with a callback that does the memmove.
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Also, let's check that CB is valid. If not, emplacing undefined data is fine.
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Alternatively consider making this return a std::pair
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e.g. std::pair<BufferView, uintptr_t> Reserve(size_t length, size_t align); and then on this line you
return std::make_pair(BufferView{...}, GetBuffer() + old_length);There was a problem hiding this comment.
Emplace could still be dried up as Chinmay is suggesting to internally call Reserve and use the pointer.
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LGTM, stylistic comments that are not meant to be blocking. |
jonahwilliams
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…128089) flutter/engine@3a453f2...02d6fbb 2023-06-01 jonahwilliams@google.com [Impeller] Emplace directly into host buffer (avoid VBB) for text data (flutter/engine#42484) 2023-06-01 john@johnmccutchan.com Ensure PlatformView engine life cycle callbacks are invoked (flutter/engine#42491) 2023-06-01 skia-flutter-autoroll@skia.org Roll Skia from c408e8e9cc96 to 082a7d1f72f7 (8 revisions) (flutter/engine#42496) 2023-06-01 leroux_bruno@yahoo.fr [Windows - TextInput] Insert new line only when TextInputAction.newline (flutter/engine#42244) 2023-06-01 zanderso@users.noreply.github.com Revert "Move clang tidy v2 build to prod." (flutter/engine#42495) 2023-06-01 linxunfeng@yeah.net Add myself to AUTHORS (flutter/engine#42406) 2023-06-01 bdero@google.com [Impeller] Add Impeller Metal support in the embedder API (flutter/engine#42411) 2023-06-01 jinhe.zjh@alibaba-inc.com Support DisposalMethod::kRestorePrevious in MultiFrameCodec and fix the apng problem. (flutter/engine#42153) 2023-06-01 smartercallum@gmail.com Fix crash getting spell-check suggestions (flutter/engine#42466) 2023-06-01 bdero@google.com Fix lint in rectangle packer (flutter/engine#42489) 2023-06-01 jason-simmons@users.noreply.github.com Wait for GL command completion in the ExternalTextureGLRefreshedTooOften test (flutter/engine#42438) 2023-06-01 mdebbar@google.com Reland "[web] Remove the JS API for url strategy (#42134)" (flutter/engine#42486) 2023-06-01 skia-flutter-autoroll@skia.org Roll Skia from f5bc3d12f0eb to c408e8e9cc96 (9 revisions) (flutter/engine#42487) 2023-06-01 kjlubick@users.noreply.github.com Clean up Skia includes around SkSurfaceCharacterization (flutter/engine#42485) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC jonahwilliams@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
From local testing, this shaves off about 0.3-4 ms of pure allocation overhead from flutter/flutter#127760
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