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(#447)\n\nAvoiding 32kB decompression lag\r\n===============================\r\n\r\nBefore this commit, decompressed data would be accumulated in\r\n`ZlibStream::out_buffer` and returned via `image_data` with 32kB lag\r\ncorresponding to `CHUNCK_BUFFER_SIZE`:\r\n\r\n    ```\r\n    fn transfer_finished_data(&mut self, image_data: &mut Vec<u8>) -> usize {\r\n        let safe = self.out_pos.saturating_sub(CHUNCK_BUFFER_SIZE);\r\n        image_data.extend(self.out_buffer.drain(..safe));\r\n        ...\r\n    ```\r\n\r\n32kB is a typical size of L1 cache, so the lag would mean that the data\r\npassed to `image_data.extend(...)` would be already cold and evicted\r\nfrom the L1 cache.\r\n\r\nThis commit avoids the lag by always returning into `image_data` all the\r\ndata from `out_buffer` (i.e. data up to `out_pos`):\r\n\r\n    ```\r\n    fn transfer_finished_data(&mut self, image_data: &mut Vec<u8>) -> usize {\r\n        let transferred = &self.out_buffer[self.read_pos..self.out_pos];\r\n        image_data.extend_from_slice(transferred);\r\n        self.read_pos = self.out_pos;\r\n        ...\r\n    ```\r\n\r\nCompacting less often\r\n=====================\r\n\r\nThe changes above mean that `Vec::drain` no longer compacts `out_buffer`.\r\nTherefore this commit also refactors how this compaction works.\r\n\r\nBefore this commit, not-yet-returned data would be shifted to the\r\nbeginning of `out_buffer` every time `transfer_finished_data` is called.\r\nThis could potentially mean that for 1 returned byte, N bytes have to be\r\ncopied during compaction.\r\n\r\nAfter this commit, compaction is only done when the compaction cost if\r\noffset by many read bytes - for 3 returned bytes 1 byte has to be copied\r\nduring compaction.\r\n\r\nPerformance impact\r\n==================\r\n\r\nThe commit has a positive impact on performance, except for:\r\n\r\n* `decode/Transparency.png` - regression between 15% and 20% is reported\r\n  in 3-out-of-3 measurements.\r\n* `decode/kodim17.png` - a regression of 2.1% has been reported in\r\n  1-out-of-3 measurements (an improvement of 0.6% - 1.13% has been\r\n  reported in the other 2-out-of-3 measurements).\r\n* `generated-noncompressed-64k-idat/128x128.png` - a regression of 25%\r\n  has been reported in 1-out-of-3 measurements (an improvement of 21% -\r\n  29% has been reported in the other 2-out-of-3 measurements).\r\n\r\nThe results below have been gathered by running the `decoder` benchmark.\r\nFirst a baseline was saved before this commit, and then a comparison\r\nwas done after the commit.  This (the baseline + the comparison) was\r\nrepeated a total of 3 times.  All results below are for the relative\r\nimpact on the runtime.  All results are with p = 0.00 < 0.05.\r\n\r\n* decode/kodim23.png:\r\n    * [-2.9560% -2.7112% -2.4009%]\r\n    * [-3.4876% -3.3406% -3.1928%]\r\n    * [-3.0559% -2.9208% -2.7787%]\r\n\r\n* decode/kodim07.png:\r\n    * [-1.2527% -1.0110% -0.6780%]\r\n    * [-1.7851% -1.6558% -1.5164%]\r\n    * [-1.6576% -1.5216% -1.3856%]\r\n\r\n* decode/kodim02.png:\r\n    * [-0.5108% -0.2806% -0.0112%]\r\n    * [-1.0885% -0.9493% -0.8118%]\r\n    * [-0.5563% -0.4239% -0.2874%]\r\n\r\n* decode/kodim17.png:\r\n    * [+1.8649% +2.1138% +2.4169%] (**regression**)\r\n    * [-1.2891% -1.1322% -0.9736%]\r\n    * [-0.7753% -0.6276% -0.4866%]\r\n\r\n* decode/Lohengrin_-_Illustrated_Sporting_and_Dramatic_News.png:\r\n    * [-1.7165% -1.4968% -1.2650%]\r\n    * [-1.7051% -1.4473% -1.2229%]\r\n    * [-1.2544% -1.0457% -0.8375%]\r\n\r\n* decode/Transparency.png:\r\n    * [+19.329% +19.789% +20.199%] (**regression**)\r\n    * [+15.337% +15.798% +16.294%] (**regression**)\r\n    * [+18.694% +19.106% +19.518%] (**regression**)\r\n\r\n* generated-noncompressed-4k-idat/8x8.png:\r\n    * [-2.3295% -1.9940% -1.5912%]\r\n    * [-6.1285% -5.8872% -5.6091%]\r\n    * [-2.8814% -2.6787% -2.4820%]\r\n\r\n* generated-noncompressed-4k-idat/128x128.png:\r\n    * [-59.793% -59.599% -59.417%]\r\n    * [-63.930% -63.846% -63.756%]\r\n    * [-62.377% -62.248% -62.104%]\r\n\r\n* generated-noncompressed-4k-idat/2048x2048.png:\r\n    * [-67.678% -67.579% -67.480%]\r\n    * [-65.616% -65.519% -65.429%]\r\n    * [-65.824% -65.647% -65.413%]\r\n\r\n* generated-noncompressed-4k-idat/12288x12288.png:\r\n    * [-60.932% -60.774% -60.528%]\r\n    * [-62.088% -62.016% -61.940%]\r\n    * [-61.663% -61.604% -61.546%]\r\n\r\n* generated-noncompressed-64k-idat/128x128.png:\r\n    * [-22.237% -21.975% -21.701%]\r\n    * [-29.656% -29.480% -29.311%]\r\n    * [+24.812% +25.190% +25.571%] (**regression**)\r\n\r\n* generated-noncompressed-64k-idat/2048x2048.png:\r\n    * [-21.826% -21.499% -21.087%]\r\n    * [-54.279% -54.049% -53.715%]\r\n    * [-11.174% -10.828% -10.482%]\r\n\r\n* generated-noncompressed-64k-idat/12288x12288.png:\r\n    * [-40.421% -40.311% -40.180%]\r\n    * [-39.496% -39.183% -38.871%]\r\n    * [-41.443% -41.367% -41.295%]\r\n\r\n* generated-noncompressed-2g-idat/2048x2048.png:\r\n    * [-40.136% -40.010% -39.865%]\r\n    * [-58.507% -58.333% -58.060%]\r\n    * [-35.822% -35.457% -35.038%]\r\n\r\n* generated-noncompressed-2g-idat/12288x12288.png:\r\n    * [-37.196% -37.107% -37.014%]\r\n    * [-36.125% -36.049% -35.970%]\r\n    * [-35.636% -35.477% -35.350%]\r\n\r\nCo-authored-by: Lukasz Anforowicz <lukasza@marcin-mx>","shortMessageHtmlLink":"Avoid 32kB decompression lag + compact less often. (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2066592414\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/447\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/447/hovercard\" href=\"https://github.com/image-rs/image-png/pull/447\">#447</a>)"}},{"before":"d761f1614aef9a119e74cb2808c7af43a422c4c1","after":"c4121b5cfeb064983314b9d524698c1a62bea486","ref":"refs/heads/master","pushedAt":"2024-01-03T18:31:06.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Cap buffer sizes via `ZlibStream::set_max_total_output`. (#429)\n\n* Roll the `fdeflate` dependency to version 0.3.3\r\n\r\n* Cap buffer sizes via `ZlibStream::set_max_total_output`.\r\n\r\nBefore this commit, `ZlibStream::new` would always allocate and zero out\r\n64kB of data via `out_buffer: vec![0; 2 * CHUNCK_BUFFER_SIZE]`.  After\r\nthis commit, `out_buffer` is capped by the actual size of the\r\ndecompressed image data.  `StreamingDecoder::parse_ihdr` estimates the\r\nimage size and notifies `ZlibStream` via the new `set_max_total_output`\r\nmethod.\r\n\r\nImpact on the runtime of the\r\n`decode/generated-png:noncompressed-8x8.png` benchmark (3 measurements):\r\n\r\n* [-24.028% -23.693% -23.460%] (p = 0.00 < 0.05)\r\n* [-23.830% -23.480% -23.200%] (p = 0.00 < 0.05)\r\n* [-21.259% -20.893% -20.618%] (p = 0.00 < 0.05)","shortMessageHtmlLink":"Cap buffer sizes via <code>ZlibStream::set_max_total_output</code>. (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"1995813587\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/429\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/429/hovercard\" href=\"https://github.com/image-rs/image-png/pull/429\">#429</a>)"}},{"before":"8a499d93e3528c67f93443c6644e734dbe20168f","after":"d761f1614aef9a119e74cb2808c7af43a422c4c1","ref":"refs/heads/master","pushedAt":"2023-12-25T21:13:43.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Validate provided info in Encoder::with_info (#442)","shortMessageHtmlLink":"Validate provided info in Encoder::with_info (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2045392219\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/442\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/442/hovercard\" href=\"https://github.com/image-rs/image-png/pull/442\">#442</a>)"}},{"before":"51fd35b7a808932b4c2e01a18aca92bd27f4578f","after":"8a499d93e3528c67f93443c6644e734dbe20168f","ref":"refs/heads/master","pushedAt":"2023-12-17T23:16:08.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"No more hard-coded limits (#441)","shortMessageHtmlLink":"No more hard-coded limits (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2044993393\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/441\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/441/hovercard\" href=\"https://github.com/image-rs/image-png/pull/441\">#441</a>)"}},{"before":"dbe2cc602d45382a75c518009389fef986b8fc58","after":"51fd35b7a808932b4c2e01a18aca92bd27f4578f","ref":"refs/heads/master","pushedAt":"2023-12-17T21:52:33.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Benchmark varying sizes of IDATs and larger generated images (#432)","shortMessageHtmlLink":"Benchmark varying sizes of IDATs and larger generated images (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2015734956\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/432\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/432/hovercard\" href=\"https://github.com/image-rs/image-png/pull/432\">#432</a>)"}},{"before":"badce2a6fa222e1ea0abb49f04355eb56bc96753","after":"dbe2cc602d45382a75c518009389fef986b8fc58","ref":"refs/heads/master","pushedAt":"2023-12-16T02:54:47.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Faster u32 parsing (#428)\n\nThis way removes a separate `State::Signature` variant and handles the\r\nPNG signature via two `State::U32` states.  This is desirable because:\r\n\r\n* This helps to reuse the performance gains for `State::U32`\r\n  (i.e. avoid accumulating the signature byte-by-byte if the input\r\n  buffer already has all its bytes)\r\n* Avoiding separate code also has additional benefits:\r\n    - Less pressure on the instructions cache\r\n    - Ability to reuse branch prediction for `U32`-related code\r\n\r\nThe modified code already has reasonable test coverage via\r\nhttp://www.schaik.com/pngsuite/#corrupted","shortMessageHtmlLink":"Faster u32 parsing (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"1995714914\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/428\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/428/hovercard\" href=\"https://github.com/image-rs/image-png/pull/428\">#428</a>)"}},{"before":"3f563bbfd48a341e45ab20c6e1c718fba468b616","after":"badce2a6fa222e1ea0abb49f04355eb56bc96753","ref":"refs/heads/master","pushedAt":"2023-12-11T07:45:34.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Update `unstable` portable-simd imports (#437)\n\nImport SimdOrd, SimdPartialEq from std::simd::cmp\r\nImport SimdInt, SimdUint from std::simd::num\r\n\r\nThe most recent portable-simd subtree sync moved some traits\r\nout of the top level modules.","shortMessageHtmlLink":"Update <code>unstable</code> portable-simd imports (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2034563510\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/437\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/437/hovercard\" href=\"https://github.com/image-rs/image-png/pull/437\">#437</a>)"}},{"before":"7f70ffa26c77956e47670eb959b3aea27aafdced","after":"3f563bbfd48a341e45ab20c6e1c718fba468b616","ref":"refs/heads/master","pushedAt":"2023-12-05T19:32:51.000Z","pushType":"pr_merge","commitsCount":1,"pusher":{"login":"fintelia","name":"Jonathan Behrens","path":"/fintelia","primaryAvatarUrl":"https://avatars.githubusercontent.com/u/4943209?s=80&v=4"},"commit":{"message":"Test failing image for skip_ancillary_crc disabled (#436)","shortMessageHtmlLink":"Test failing image for skip_ancillary_crc disabled (<a class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2026060035\" data-permission-text=\"Title is private\" data-url=\"https://github.com/image-rs/image-png/issues/436\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/image-rs/image-png/pull/436/hovercard\" href=\"https://github.com/image-rs/image-png/pull/436\">#436</a>)"}}],"hasNextPage":true,"hasPreviousPage":false,"activityType":"all","actor":null,"timePeriod":"all","sort":"DESC","perPage":30,"cursor":"djE6ks8AAAAEJBE9MQA","startCursor":null,"endCursor":null}},"title":"Activity · image-rs/image-png"}