From 625bbfaeb5b64013022f86be358a20fc9727ea67 Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Wed, 21 May 2025 18:55:32 +0200
Subject: [PATCH 1/6] xtask with Kompari

---
 .cargo/config.toml          |   1 +
 Cargo.lock                  | 533 +++++++++++++++++++++++++++++++++++-
 Cargo.toml                  |   1 +
 vello_tests/src/snapshot.rs |   9 +
 xtask/Cargo.toml            |  19 ++
 xtask/README.md             |  18 ++
 xtask/src/main.rs           | 108 ++++++++
 7 files changed, 687 insertions(+), 2 deletions(-)
 create mode 100644 xtask/Cargo.toml
 create mode 100644 xtask/README.md
 create mode 100644 xtask/src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
index d787df211..bc3896139 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -6,3 +6,4 @@ run_wasm = "run --release --package run_wasm --"
 # Other crates use the alias run-wasm, even though crate names should use `_`s not `-`s
 # Allow this to be used
 run-wasm = "run_wasm"
+xtask = "run --release --package xtask --"
diff --git a/Cargo.lock b/Cargo.lock
index 2eb0de4ec..8f9656c60 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -18,6 +18,15 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c71b1793ee61086797f5c80b6efa2b8ffa6d5dd703f118545808a7f2e27f7046"
 
+[[package]]
+name = "addr2line"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfbe277e56a376000877090da837660b4427aad530e3028d44e0bffe4f89a1c1"
+dependencies = [
+ "gimli 0.31.1",
+]
+
 [[package]]
 name = "adler2"
 version = "2.0.0"
@@ -79,6 +88,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
 [[package]]
 name = "android_log-sys"
 version = "0.3.2"
@@ -215,6 +230,75 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
+[[package]]
+name = "axum"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "021e862c184ae977658b36c4500f7feac3221ca5da43e3f25bd04ab6c79a29b5"
+dependencies = [
+ "axum-core",
+ "bytes",
+ "form_urlencoded",
+ "futures-util",
+ "http",
+ "http-body",
+ "http-body-util",
+ "hyper",
+ "hyper-util",
+ "itoa",
+ "matchit",
+ "memchr",
+ "mime",
+ "percent-encoding",
+ "pin-project-lite",
+ "rustversion",
+ "serde",
+ "serde_json",
+ "serde_path_to_error",
+ "serde_urlencoded",
+ "sync_wrapper",
+ "tokio",
+ "tower",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "axum-core"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68464cd0412f486726fb3373129ef5d2993f90c34bc2bc1c1e9943b2f4fc7ca6"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "http",
+ "http-body",
+ "http-body-util",
+ "mime",
+ "pin-project-lite",
+ "rustversion",
+ "sync_wrapper",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "backtrace"
+version = "0.3.75"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6806a6321ec58106fea15becdad98371e28d92ccbc7c8f1b3b6dd724fe8f1002"
+dependencies = [
+ "addr2line",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+ "windows-targets 0.52.6",
+]
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -389,6 +473,20 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
+[[package]]
+name = "chrono"
+version = "0.4.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c469d952047f47f91b68d1cba3f10d63c11d73e4636f24f08daf0278abf01c4d"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "wasm-bindgen",
+ "windows-link",
+]
+
 [[package]]
 name = "ciborium"
 version = "0.2.2"
@@ -463,7 +561,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
 dependencies = [
  "termcolor",
- "unicode-width",
+ "unicode-width 0.1.14",
 ]
 
 [[package]]
@@ -501,6 +599,19 @@ dependencies = [
  "crossbeam-utils",
 ]
 
+[[package]]
+name = "console"
+version = "0.15.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "054ccb5b10f9f2cbf51eb355ca1d05c2d279ce1804688d0db74b4733a5aeafd8"
+dependencies = [
+ "encode_unicode",
+ "libc",
+ "once_cell",
+ "unicode-width 0.2.0",
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "console_error_panic_hook"
 version = "0.1.7"
@@ -730,6 +841,12 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
 
+[[package]]
+name = "encode_unicode"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
+
 [[package]]
 name = "env_filter"
 version = "0.1.3"
@@ -844,6 +961,12 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "98de4bbd547a563b716d8dfa9aad1cb19bfab00f4fa09a6a4ed21dbcf44ce9c4"
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "foldhash"
 version = "0.1.5"
@@ -942,6 +1065,15 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
 
+[[package]]
+name = "form_urlencoded"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
+dependencies = [
+ "percent-encoding",
+]
+
 [[package]]
 name = "fsevent-sys"
 version = "4.1.0"
@@ -957,6 +1089,15 @@ version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
 
+[[package]]
+name = "futures-channel"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dff15bf788c671c1934e366d07e30c1814a8ef514e1af724a602e8a2fbe1b10"
+dependencies = [
+ "futures-core",
+]
+
 [[package]]
 name = "futures-core"
 version = "0.3.31"
@@ -974,6 +1115,24 @@ dependencies = [
  "parking_lot",
 ]
 
+[[package]]
+name = "futures-task"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f90f7dce0722e95104fcb095585910c0977252f286e354b5e3bd38902cd99988"
+
+[[package]]
+name = "futures-util"
+version = "0.3.31"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fa08315bb612088cc391249efdc3bc77536f16c91f6cf495e6fbe85b20a4a81"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "pin-project-lite",
+ "pin-utils",
+]
+
 [[package]]
 name = "gethostname"
 version = "0.4.3"
@@ -1009,6 +1168,12 @@ dependencies = [
  "stable_deref_trait",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
+
 [[package]]
 name = "gl_generator"
 version = "0.14.0"
@@ -1177,6 +1342,120 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dfa686283ad6dd069f105e5ab091b04c62850d3e4cf5d67debad1933f55023df"
 
+[[package]]
+name = "http"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4a85d31aea989eead29a3aaf9e1115a180df8282431156e533de47660892565"
+dependencies = [
+ "bytes",
+ "fnv",
+ "itoa",
+]
+
+[[package]]
+name = "http-body"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1efedce1fb8e6913f23e0c92de8e62cd5b772a67e7b3946df930a62566c93184"
+dependencies = [
+ "bytes",
+ "http",
+]
+
+[[package]]
+name = "http-body-util"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b021d93e26becf5dc7e1b75b1bed1fd93124b374ceb73f43d4d4eafec896a64a"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "http",
+ "http-body",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "httparse"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6dbf3de79e51f3d586ab4cb9d5c3e2c14aa28ed23d180cf89b4df0454a69cc87"
+
+[[package]]
+name = "httpdate"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
+
+[[package]]
+name = "humansize"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6cb51c9a029ddc91b07a787f1d86b53ccfa49b0e86688c946ebe8d3555685dd7"
+dependencies = [
+ "libm",
+]
+
+[[package]]
+name = "hyper"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc2b571658e38e0c01b1fdca3bbbe93c00d3d71693ff2770043f8c29bc7d6f80"
+dependencies = [
+ "bytes",
+ "futures-channel",
+ "futures-util",
+ "http",
+ "http-body",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "pin-project-lite",
+ "smallvec",
+ "tokio",
+]
+
+[[package]]
+name = "hyper-util"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf9f1e950e0d9d1d3c47184416723cf29c0d1f93bd8cccf37e4beb6b44f31710"
+dependencies = [
+ "bytes",
+ "futures-util",
+ "http",
+ "http-body",
+ "hyper",
+ "pin-project-lite",
+ "tokio",
+ "tower-service",
+]
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0c919e5debc312ad217002b8048a17b7d83f80703865bbfcfebb0458b0b27d8"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icu_locid"
 version = "1.5.0"
@@ -1240,6 +1519,19 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "indicatif"
+version = "0.17.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "183b3088984b400f4cfac3620d5e076c84da5364016b4f49473de574b2586235"
+dependencies = [
+ "console",
+ "number_prefix",
+ "portable-atomic",
+ "unicode-width 0.2.0",
+ "web-time",
+]
+
 [[package]]
 name = "inotify"
 version = "0.11.0"
@@ -1375,6 +1667,49 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
 
+[[package]]
+name = "kompari"
+version = "0.1.0"
+source = "git+https://github.com/linebender/kompari.git?rev=4b851413e1b17307064aa48c50e59d7e29656543#4b851413e1b17307064aa48c50e59d7e29656543"
+dependencies = [
+ "image",
+ "log",
+ "oxipng",
+ "rayon",
+ "thiserror 2.0.12",
+ "walkdir",
+]
+
+[[package]]
+name = "kompari-html"
+version = "0.1.0"
+source = "git+https://github.com/linebender/kompari.git?rev=4b851413e1b17307064aa48c50e59d7e29656543#4b851413e1b17307064aa48c50e59d7e29656543"
+dependencies = [
+ "axum",
+ "base64",
+ "chrono",
+ "imagesize",
+ "kompari",
+ "maud",
+ "rayon",
+ "serde",
+ "tokio",
+]
+
+[[package]]
+name = "kompari-tasks"
+version = "0.1.0"
+source = "git+https://github.com/linebender/kompari.git?rev=4b851413e1b17307064aa48c50e59d7e29656543#4b851413e1b17307064aa48c50e59d7e29656543"
+dependencies = [
+ "clap",
+ "humansize",
+ "indicatif",
+ "kompari",
+ "kompari-html",
+ "rayon",
+ "termcolor",
+]
+
 [[package]]
 name = "kqueue"
 version = "1.1.1"
@@ -1519,6 +1854,34 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "matchit"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47e1ffaa40ddd1f3ed91f717a33c8c0ee23fff369e3aa8772b9605cc1d22f4c3"
+
+[[package]]
+name = "maud"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8156733e27020ea5c684db5beac5d1d611e1272ab17901a49466294b84fc217e"
+dependencies = [
+ "itoa",
+ "maud_macros",
+]
+
+[[package]]
+name = "maud_macros"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7261b00f3952f617899bc012e3dbd56e4f0110a038175929fa5d18e5a19913ca"
+dependencies = [
+ "proc-macro2",
+ "proc-macro2-diagnostics",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
@@ -1549,6 +1912,12 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "mime"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
+
 [[package]]
 name = "minicov"
 version = "0.3.7"
@@ -1727,6 +2096,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "number_prefix"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
+
 [[package]]
 name = "nv-flip"
 version = "0.1.2"
@@ -1995,6 +2370,15 @@ dependencies = [
  "objc2-foundation 0.2.2",
 ]
 
+[[package]]
+name = "object"
+version = "0.36.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62948e14d923ea95ea2c7c86c71013138b66525b86bdc08d2dcc262bdb497b87"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -2051,12 +2435,14 @@ checksum = "26c613f0f566526a647c7473f6a8556dbce22c91b13485ee4b4ec7ab648e4973"
 dependencies = [
  "bitvec",
  "crossbeam-channel",
+ "filetime",
  "indexmap 2.9.0",
  "libdeflater",
  "log",
  "rayon",
  "rgb",
  "rustc-hash 2.1.1",
+ "zopfli",
 ]
 
 [[package]]
@@ -2151,6 +2537,12 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
 
+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.32"
@@ -2239,6 +2631,18 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "proc-macro2-diagnostics"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af066a9c399a26e020ada66a034357a868728e72cd426f3adcd35f80d88d88c8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check",
+]
+
 [[package]]
 name = "profiling"
 version = "1.0.16"
@@ -2634,6 +3038,28 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_path_to_error"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59fab13f937fa393d08645bf3a84bdfe86e296747b506ada67bb15f10f218b2a"
+dependencies = [
+ "itoa",
+ "serde",
+]
+
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -2749,6 +3175,16 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "socket2"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4f5fd57c80058a56cf5c777ab8a126398ece8e442983605d280a44ce79d0edef"
+dependencies = [
+ "libc",
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "spirv"
 version = "0.3.0+sdk-1.3.268.0"
@@ -2851,6 +3287,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "sync_wrapper"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bf256ce5efdfa370213c1dabab5935a12e49f2c58d15e9eac2870d3b4f27263"
+
 [[package]]
 name = "tap"
 version = "1.0.1"
@@ -2988,6 +3430,32 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
+[[package]]
+name = "tokio"
+version = "1.45.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2513ca694ef9ede0fb23fe71a4ee4107cb102b9dc1930f6d0fd77aae068ae165"
+dependencies = [
+ "backtrace",
+ "libc",
+ "mio",
+ "pin-project-lite",
+ "socket2",
+ "tokio-macros",
+ "windows-sys 0.52.0",
+]
+
+[[package]]
+name = "tokio-macros"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.6.9"
@@ -3005,6 +3473,34 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "tower"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d039ad9159c98b70ecfd540b2573b97f7f52c3e8d9f8ad57a24b916a536975f9"
+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project-lite",
+ "sync_wrapper",
+ "tokio",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
+
+[[package]]
+name = "tower-service"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
+
 [[package]]
 name = "tracing"
 version = "0.1.41"
@@ -3127,6 +3623,12 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
 
+[[package]]
+name = "unicode-width"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fc81956842c57dac11422a97c3b8195a1ff727f06e85c84ed2e8aa277c9a0fd"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.6"
@@ -3386,7 +3888,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6481311b98508f4bc2d0abbfa5d42172e7a54b4b24d8f15e28b0dc650be0c59f"
 dependencies = [
  "anyhow",
- "gimli",
+ "gimli 0.26.2",
  "id-arena",
  "leb128",
  "log",
@@ -3942,6 +4444,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "windows-link"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76840935b766e1b0a05c0066835fb9ec80071d4c09a16f6bd5f7e655e3c14c38"
+
 [[package]]
 name = "windows-result"
 version = "0.2.0"
@@ -4415,6 +4923,15 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec7a2a501ed189703dba8b08142f057e887dfc4b2cc4db2d343ac6376ba3e0b9"
 
+[[package]]
+name = "xtask"
+version = "0.0.0"
+dependencies = [
+ "clap",
+ "kompari",
+ "kompari-tasks",
+]
+
 [[package]]
 name = "yazi"
 version = "0.2.1"
@@ -4447,6 +4964,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "zopfli"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "edfc5ee405f504cd4984ecc6f14d02d55cfda60fa4b689434ef4102aae150cd7"
+dependencies = [
+ "bumpalo",
+ "crc32fast",
+ "log",
+ "simd-adler32",
+]
+
 [[package]]
 name = "zune-core"
 version = "0.4.12"
diff --git a/Cargo.toml b/Cargo.toml
index c2f2bc9e5..b43823fed 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ members = [
     "vello_encoding",
     "vello_shaders",
     "vello_tests",
+    "xtask",
 
     "examples/headless",
     "examples/run_wasm",
diff --git a/vello_tests/src/snapshot.rs b/vello_tests/src/snapshot.rs
index c90940f5c..cfb6cebfa 100644
--- a/vello_tests/src/snapshot.rs
+++ b/vello_tests/src/snapshot.rs
@@ -187,6 +187,15 @@ pub fn snapshot_test_image(
         .join(&params.name)
         .with_extension("png");
 
+    if env::var("VELLO_TEST_GENERATE_ALL").is_ok() {
+        write_png_to_file(
+            params,
+            &update_path,
+            &raw_rendered,
+            Some(directory.max_size_in_bytes()),
+        )?;
+    }
+
     let expected_data = match image::open(&reference_path) {
         Ok(contents) => {
             let size = std::fs::metadata(&reference_path).map(|it| it.len())?;
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
new file mode 100644
index 000000000..840a9a188
--- /dev/null
+++ b/xtask/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "xtask"
+publish = false
+edition.workspace = true
+rust-version.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Dev tooling for Parley"
+keywords = ["testing"]
+categories = ["testing", "graphics"]
+
+
+[dependencies]
+kompari = { git = "https://github.com/linebender/kompari.git", rev = "4b851413e1b17307064aa48c50e59d7e29656543" }
+kompari-tasks = { git = "https://github.com/linebender/kompari.git", rev = "4b851413e1b17307064aa48c50e59d7e29656543" }
+clap = { version = "4", features = ["derive"] }
+
+[lints]
+workspace = true
diff --git a/xtask/README.md b/xtask/README.md
new file mode 100644
index 000000000..f11f0e89e
--- /dev/null
+++ b/xtask/README.md
@@ -0,0 +1,18 @@
+# Xtask dev utilities
+
+This package provides the following commands:
+
+## Snapshots
+
+```bash
+cargo xtask snaphosts report  # Creates report for snapshots
+cargo xtask shapshots review  # Interactive test blessing snapshots
+cargo xtask shapshots dead-snaphosts  # Detects dead snapshots
+cargo xtask shapshots size-check  # Size check for snapshots
+```
+
+## Comparisons
+
+```bash
+cargo xtask comparisons report  # Creates report for comparisons
+```
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
new file mode 100644
index 000000000..8afea1466
--- /dev/null
+++ b/xtask/src/main.rs
@@ -0,0 +1,108 @@
+// Copyright 2025 the Parley Authors
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+//! Xtask utilities for Vello, currently only integrates Kompari
+
+use clap::Parser;
+use kompari::DirDiffConfig;
+use kompari_tasks::args::{Command as KompariCommand, ReportArgs};
+use kompari_tasks::{Actions, Args, Task};
+use std::path::Path;
+use std::process::Command;
+
+struct ActionsImpl();
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+/// Top-level command line parser for xtask
+pub struct Cli {
+    /// Command
+    #[clap(subcommand)]
+    pub command: CliCommand,
+}
+
+#[derive(Parser, Debug)]
+/// Top-level xtask command
+pub enum CliCommand {
+    /// Commands related to snapshots (current vs. reference)
+    Snapshots(Args),
+    /// Commands related to comparisons (cpu vs. gpu)
+    Comparisons(ComparisonsArgs),
+}
+
+#[derive(Parser, Debug)]
+/// CLI parser for comparisons
+pub struct ComparisonsArgs {
+    /// Command
+    #[clap(subcommand)]
+    pub command: ComparisonsCommand,
+}
+
+#[derive(Parser, Debug)]
+/// Command for comparisons,
+/// because only report command makes, we do not reuse `kompari_tasks::Args`
+pub enum ComparisonsCommand {
+    /// Create report with differences between cpu/gpu versions
+    Report(ReportArgs),
+}
+
+impl Actions for ActionsImpl {
+    fn generate_all_tests(&self) -> kompari::Result<()> {
+        let cargo = std::env::var("CARGO").unwrap();
+        Command::new(&cargo)
+            .arg("test")
+            .env("VELLO_TEST_GENERATE_ALL", "1")
+            .status()?;
+        Ok(())
+    }
+}
+
+fn snapshots_command(args: Args) -> kompari::Result<()> {
+    let tests_path = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .unwrap()
+        .join("vello_tests");
+
+    let snapshots_path = tests_path.join("snapshots");
+    let current_path = tests_path.join("current");
+
+    let mut diff_config = DirDiffConfig::new(snapshots_path, current_path);
+    diff_config.set_ignore_right_missing(true);
+    let actions = ActionsImpl();
+    let mut task = Task::new(diff_config, Box::new(actions));
+    task.run(&args)?;
+    Ok(())
+}
+
+fn comparisons_command(args: ComparisonsArgs) -> kompari::Result<()> {
+    let tests_path = Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .unwrap()
+        .join("vello_tests")
+        .join("comparisons");
+
+    let cpu_path = tests_path.join("cpu");
+    let gpu_path = tests_path.join("gpu");
+
+    let diff_config = DirDiffConfig::new(cpu_path, gpu_path);
+    let actions = ActionsImpl();
+    let mut task = Task::new(diff_config, Box::new(actions));
+    task.report_config().set_left_title("cpu");
+    task.report_config().set_right_title("gpu");
+    match args.command {
+        ComparisonsCommand::Report(args) => {
+            task.run(&Args {
+                command: KompariCommand::Report(args),
+            })?;
+        }
+    }
+    Ok(())
+}
+
+fn main() -> kompari::Result<()> {
+    let args = Cli::parse();
+    match args.command {
+        CliCommand::Snapshots(args) => snapshots_command(args),
+        CliCommand::Comparisons(args) => comparisons_command(args),
+    }
+}

From 6cc08196f4db14a5486db9c298f700206d6f4e89 Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Sat, 24 May 2025 10:10:35 +0200
Subject: [PATCH 2/6] Code review fixes

---
 xtask/Cargo.toml  |  2 +-
 xtask/src/main.rs | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 840a9a188..7b3cdaf07 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -5,7 +5,7 @@ edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
 repository.workspace = true
-description = "Dev tooling for Parley"
+description = "Dev tooling for Vello"
 keywords = ["testing"]
 categories = ["testing", "graphics"]
 
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 8afea1466..4072aeb99 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -25,7 +25,9 @@ pub struct Cli {
 /// Top-level xtask command
 pub enum CliCommand {
     /// Commands related to snapshots (current vs. reference)
-    Snapshots(Args),
+    SnapshotsCpu(Args),
+    /// Commands related to snapshots (current vs. reference)
+    SnapshotsGpu(Args),
     /// Commands related to comparisons (cpu vs. gpu)
     Comparisons(ComparisonsArgs),
 }
@@ -40,7 +42,7 @@ pub struct ComparisonsArgs {
 
 #[derive(Parser, Debug)]
 /// Command for comparisons,
-/// because only report command makes, we do not reuse `kompari_tasks::Args`
+/// in comparisons there is no ground truth images, so no other command then "report" makes sense.
 pub enum ComparisonsCommand {
     /// Create report with differences between cpu/gpu versions
     Report(ReportArgs),
@@ -57,14 +59,14 @@ impl Actions for ActionsImpl {
     }
 }
 
-fn snapshots_command(args: Args) -> kompari::Result<()> {
+fn snapshots_command(dir: &str, args: Args) -> kompari::Result<()> {
     let tests_path = Path::new(env!("CARGO_MANIFEST_DIR"))
         .parent()
         .unwrap()
         .join("vello_tests");
 
     let snapshots_path = tests_path.join("snapshots");
-    let current_path = tests_path.join("current");
+    let current_path = tests_path.join("current").join(dir);
 
     let mut diff_config = DirDiffConfig::new(snapshots_path, current_path);
     diff_config.set_ignore_right_missing(true);
@@ -82,7 +84,9 @@ fn comparisons_command(args: ComparisonsArgs) -> kompari::Result<()> {
         .join("comparisons");
 
     let cpu_path = tests_path.join("cpu");
+    std::fs::create_dir_all(&cpu_path)?;
     let gpu_path = tests_path.join("gpu");
+    std::fs::create_dir_all(&gpu_path)?;
 
     let diff_config = DirDiffConfig::new(cpu_path, gpu_path);
     let actions = ActionsImpl();
@@ -102,7 +106,8 @@ fn comparisons_command(args: ComparisonsArgs) -> kompari::Result<()> {
 fn main() -> kompari::Result<()> {
     let args = Cli::parse();
     match args.command {
-        CliCommand::Snapshots(args) => snapshots_command(args),
+        CliCommand::SnapshotsCpu(args) => snapshots_command("cpu", args),
+        CliCommand::SnapshotsGpu(args) => snapshots_command("gpu", args),
         CliCommand::Comparisons(args) => comparisons_command(args),
     }
 }

From 143ce36968f296828e8c87e94133c7bb0ccbc123 Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Sat, 24 May 2025 10:14:28 +0200
Subject: [PATCH 3/6] Docs updated

---
 xtask/README.md   | 15 +++++++++++----
 xtask/src/main.rs |  2 +-
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/xtask/README.md b/xtask/README.md
index f11f0e89e..ad4b89e4d 100644
--- a/xtask/README.md
+++ b/xtask/README.md
@@ -5,12 +5,19 @@ This package provides the following commands:
 ## Snapshots
 
 ```bash
-cargo xtask snaphosts report  # Creates report for snapshots
-cargo xtask shapshots review  # Interactive test blessing snapshots
-cargo xtask shapshots dead-snaphosts  # Detects dead snapshots
-cargo xtask shapshots size-check  # Size check for snapshots
+cargo xtask snaphosts-cpu report  # Creates report for snapshots
+cargo xtask shapshots-cpu review  # Interactive test blessing snapshots
+cargo xtask shapshots-cpu dead-snaphosts  # Detects dead snapshots
+cargo xtask shapshots-cpu size-check  # Size check for snapshots
 ```
 
+The same works for `snapshots-gpu`
+
+```bash
+cargo xtask snaphosts-gpu ...
+```
+
+
 ## Comparisons
 
 ```bash
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 4072aeb99..42c16b48f 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -1,4 +1,4 @@
-// Copyright 2025 the Parley Authors
+// Copyright 2024 the Vello Authors
 // SPDX-License-Identifier: Apache-2.0 OR MIT
 
 //! Xtask utilities for Vello, currently only integrates Kompari

From 08610349ed9d17a38170aee14e6c112e01819d2c Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Thu, 12 Jun 2025 17:52:02 +0200
Subject: [PATCH 4/6] Code review fixes

---
 xtask/Cargo.toml  | 2 +-
 xtask/src/main.rs | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 7b3cdaf07..8f2b48319 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -13,7 +13,7 @@ categories = ["testing", "graphics"]
 [dependencies]
 kompari = { git = "https://github.com/linebender/kompari.git", rev = "4b851413e1b17307064aa48c50e59d7e29656543" }
 kompari-tasks = { git = "https://github.com/linebender/kompari.git", rev = "4b851413e1b17307064aa48c50e59d7e29656543" }
-clap = { version = "4", features = ["derive"] }
+clap = { workspace = true, features = ["derive"] }
 
 [lints]
 workspace = true
diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index 42c16b48f..42828af6e 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -16,7 +16,8 @@ struct ActionsImpl();
 #[command(version, about, long_about = None)]
 /// Top-level command line parser for xtask
 pub struct Cli {
-    /// Command
+    /// The possible commands in this CLI.
+    /// This enables (future) global flags to be added to this struct
     #[clap(subcommand)]
     pub command: CliCommand,
 }
@@ -52,7 +53,8 @@ impl Actions for ActionsImpl {
     fn generate_all_tests(&self) -> kompari::Result<()> {
         let cargo = std::env::var("CARGO").unwrap();
         Command::new(&cargo)
-            .arg("test")
+            .arg("nextest")
+            .arg("run")
             .env("VELLO_TEST_GENERATE_ALL", "1")
             .status()?;
         Ok(())

From ed9a4a48715140a6f6bcf33217dbb5fccc5cef0d Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Thu, 19 Jun 2025 16:46:14 +0200
Subject: [PATCH 5/6] Fixex typos

---
 xtask/README.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xtask/README.md b/xtask/README.md
index ad4b89e4d..33cb190ac 100644
--- a/xtask/README.md
+++ b/xtask/README.md
@@ -6,9 +6,9 @@ This package provides the following commands:
 
 ```bash
 cargo xtask snaphosts-cpu report  # Creates report for snapshots
-cargo xtask shapshots-cpu review  # Interactive test blessing snapshots
-cargo xtask shapshots-cpu dead-snaphosts  # Detects dead snapshots
-cargo xtask shapshots-cpu size-check  # Size check for snapshots
+cargo xtask snapshots-cpu review  # Interactive test blessing snapshots
+cargo xtask snapshots-cpu dead-snaphosts  # Detects dead snapshots
+cargo xtask snapshots-cpu size-check  # Size check for snapshots
 ```
 
 The same works for `snapshots-gpu`

From badb6ddfd427c9736eabd85e4b2d383a6c156110 Mon Sep 17 00:00:00 2001
From: Ada Bohm <ada@kreatrix.org>
Date: Thu, 19 Jun 2025 16:55:30 +0200
Subject: [PATCH 6/6] Fixed wasm ci for xtask

---
 .github/workflows/ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 04f612b9b..e44fd0f91 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ env:
   FEATURES_DEPENDING_ON_STD: "std,default,png,pico_svg,multithreading"
   # List of packages that can not target Wasm.
   # `vello_tests` uses `nv-flip`, which doesn't support Wasm.
-  NO_WASM_PKGS: "--exclude vello_tests"
+  NO_WASM_PKGS: "--exclude vello_tests --exclude xtask"
   # The files stored in LFS the tests need to access, in JSON format
   LFS_FILES: '["vello_tests/snapshots/*.png", "sparse_strips/vello_sparse_tests/snapshots/*.png"]'