From bf225be505abd77c88dc92199ff912b6fe21df46 Mon Sep 17 00:00:00 2001
From: Cail Daley <cail.daley@cea.fr>
Date: Thu, 16 Jul 2026 17:18:42 +0200
Subject: [PATCH 1/4] feat(mask): declare healsparse + hpgeom dependencies

First step of the external-healsparse-mask path (#846): the reader
rasterizes maskforce healsparse products onto image pixel grids in
place of internal mask generation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CfRuCQa2UHo44yp2MZDsJX
---
 pyproject.toml |    2 +
 uv.lock        | 1122 ++++++++++++++++++++++++------------------------
 2 files changed, 565 insertions(+), 559 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 8b259dee..5388adc8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,8 @@ dependencies = [
     "cs_util>=0.2.1",
     "galsim>=2.8",
     "h5py",
+    "healsparse",
+    "hpgeom",
     "joblib>=1.4",
     "matplotlib>=3.10",
     "mccd>=1.2.4",
diff --git a/uv.lock b/uv.lock
index 03deab0a..3d024897 100644
--- a/uv.lock
+++ b/uv.lock
@@ -14,7 +14,7 @@ name = "accessible-pygments"
 version = "0.0.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "pygments" },
+    { name = "pygments", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/bc/c1/bbac6a50d02774f91572938964c582fff4270eee73ab822a4aeea4d8b11b/accessible_pygments-0.0.5.tar.gz", hash = "sha256:40918d3e6a2b619ad424cb91e556bd3bd8865443d9f22f1dcdf79e33c8046872", size = 1377899, upload-time = "2024-05-10T11:23:10.216Z" }
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@@ -62,8 +62,8 @@ name = "anyio"
 version = "4.13.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "idna" },
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "idna", marker = "sys_platform == 'linux'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13' and sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/19/14/2c5dd9f512b66549ae92767a9c7b330ae88e1932ca57876909410251fe13/anyio-4.13.0.tar.gz", hash = "sha256:334b70e641fd2221c1505b3890c69882fe4a2df910cba14d97019b90b24439dc", size = 231622, upload-time = "2026-03-24T12:59:09.671Z" }
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@@ -75,7 +75,7 @@ name = "argon2-cffi"
 version = "25.1.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "argon2-cffi-bindings" },
+    { name = "argon2-cffi-bindings", marker = "sys_platform == 'linux'" },
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@@ -87,7 +87,7 @@ name = "argon2-cffi-bindings"
 version = "25.1.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "cffi" },
+    { name = "cffi", marker = "sys_platform == 'linux'" },
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@@ -115,8 +115,8 @@ name = "arrow"
 version = "1.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "python-dateutil" },
-    { name = "tzdata" },
+    { name = "python-dateutil", marker = "sys_platform == 'linux'" },
+    { name = "tzdata", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/b9/33/032cdc44182491aa708d06a68b62434140d8c50820a087fac7af37703357/arrow-1.4.0.tar.gz", hash = "sha256:ed0cc050e98001b8779e84d461b0098c4ac597e88704a655582b21d116e526d7", size = 152931, upload-time = "2025-10-18T17:46:46.761Z" }
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@@ -128,11 +128,11 @@ name = "astropy"
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-    { name = "numpy" },
-    { name = "packaging" },
-    { name = "pyerfa" },
-    { name = "pyyaml" },
+    { name = "astropy-iers-data", marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "pyerfa", marker = "sys_platform == 'linux'" },
+    { name = "pyyaml", marker = "sys_platform == 'linux'" },
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@@ -146,8 +146,8 @@ name = "astropy-healpix"
 version = "1.1.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "astropy" },
-    { name = "numpy" },
+    { name = "astropy", marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/ce/b1/7651302dd47b76d39c053c5a2f645b4a14a1ee1dfe1cc7491bcaa6b9fe20/astropy_healpix-1.1.3.tar.gz", hash = "sha256:f520d83abe8215d3e8e1a37b2bd91171ee36a6f55f110d5a2db863d75d81b3b7", size = 109331, upload-time = "2026-01-19T23:34:18.824Z" }
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@@ -173,13 +173,13 @@ name = "astroquery"
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-    { name = "astropy" },
-    { name = "beautifulsoup4" },
-    { name = "html5lib" },
-    { name = "keyring" },
-    { name = "numpy" },
-    { name = "pyvo" },
-    { name = "requests" },
+    { name = "astropy", marker = "sys_platform == 'linux'" },
+    { name = "beautifulsoup4", marker = "sys_platform == 'linux'" },
+    { name = "html5lib", marker = "sys_platform == 'linux'" },
+    { name = "keyring", marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "pyvo", marker = "sys_platform == 'linux'" },
+    { name = "requests", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/32/48/273dbde090e071f9d264d084bc49193d126498d2906172b78febd9d62e28/astroquery-0.4.11.tar.gz", hash = "sha256:5537529bddc7fa07e773d5cd9baca593e3f5d93474edd1914f68e89506042b33", size = 12561055, upload-time = "2025-09-20T04:26:36.744Z" }
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@@ -227,8 +227,8 @@ name = "beautifulsoup4"
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 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "soupsieve" },
-    { name = "typing-extensions" },
+    { name = "soupsieve", marker = "sys_platform == 'linux'" },
+    { name = "typing-extensions", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/c3/b0/1c6a16426d389813b48d95e26898aff79abbde42ad353958ad95cc8c9b21/beautifulsoup4-4.14.3.tar.gz", hash = "sha256:6292b1c5186d356bba669ef9f7f051757099565ad9ada5dd630bd9de5fa7fb86", size = 627737, upload-time = "2025-11-30T15:08:26.084Z" }
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@@ -240,7 +240,7 @@ name = "bleach"
 version = "6.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "webencodings" },
+    { name = "webencodings", marker = "sys_platform == 'linux'" },
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@@ -249,7 +249,7 @@ wheels = [
 
 [package.optional-dependencies]
 css = [
-    { name = "tinycss2" },
+    { name = "tinycss2", marker = "sys_platform == 'linux'" },
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 [[package]]
@@ -257,8 +257,8 @@ name = "build"
 version = "1.5.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "packaging" },
-    { name = "pyproject-hooks" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "pyproject-hooks", marker = "sys_platform == 'linux'" },
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@@ -270,13 +270,13 @@ name = "cadcutils"
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-    { name = "distro" },
-    { name = "html2text" },
-    { name = "lxml" },
-    { name = "packaging" },
-    { name = "pyopenssl" },
-    { name = "requests" },
-    { name = "setuptools" },
+    { name = "distro", marker = "sys_platform == 'linux'" },
+    { name = "html2text", marker = "sys_platform == 'linux'" },
+    { name = "lxml", marker = "sys_platform == 'linux'" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "pyopenssl", marker = "sys_platform == 'linux'" },
+    { name = "requests", marker = "sys_platform == 'linux'" },
+    { name = "setuptools", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/f7/d6/1c3e4cb3f59cb2321d78f157723a22590a29854905487dcd994ea10cd63f/cadcutils-1.5.5.tar.gz", hash = "sha256:74600fdcdb4f2718576aa76b633a9e7b1989a8b37ca4cc9913cfd3ddd5415a75", size = 84921, upload-time = "2025-06-16T16:40:19.841Z" }
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 dependencies = [
-    { name = "numpy" },
-    { name = "packaging" },
-    { name = "scipy" },
-    { name = "sympy" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "scipy", marker = "sys_platform == 'linux'" },
+    { name = "sympy", marker = "sys_platform == 'linux'" },
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-    { name = "defusedxml" },
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-    { name = "questionary" },
-    { name = "rich" },
-    { name = "segno" },
-    { name = "toml" },
-    { name = "typer" },
+    { name = "cadcutils", marker = "sys_platform == 'linux'" },
+    { name = "defusedxml", marker = "sys_platform == 'linux'" },
+    { name = "httpx", extra = ["http2"], marker = "sys_platform == 'linux'" },
+    { name = "humanize", marker = "sys_platform == 'linux'" },
+    { name = "pydantic", marker = "sys_platform == 'linux'" },
+    { name = "pydantic-settings", marker = "sys_platform == 'linux'" },
+    { name = "pyyaml", marker = "sys_platform == 'linux'" },
+    { name = "questionary", marker = "sys_platform == 'linux'" },
+    { name = "rich", marker = "sys_platform == 'linux'" },
+    { name = "segno", marker = "sys_platform == 'linux'" },
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-    { name = "numpy" },
-    { name = "pyccl" },
-    { name = "scipy" },
-    { name = "swig" },
-    { name = "vos" },
+    { name = "astropy", marker = "sys_platform == 'linux'" },
+    { name = "camb", marker = "sys_platform == 'linux'" },
+    { name = "datetime", marker = "sys_platform == 'linux'" },
+    { name = "healpy", marker = "sys_platform == 'linux'" },
+    { name = "healsparse", marker = "sys_platform == 'linux'" },
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+    { name = "matplotlib", marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "pyccl", marker = "sys_platform == 'linux'" },
+    { name = "scipy", marker = "sys_platform == 'linux'" },
+    { name = "swig", marker = "sys_platform == 'linux'" },
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 [[package]]
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-    { name = "fsspec" },
-    { name = "packaging" },
-    { name = "partd" },
-    { name = "pyyaml" },
-    { name = "toolz" },
+    { name = "click", marker = "sys_platform == 'linux'" },
+    { name = "cloudpickle", marker = "sys_platform == 'linux'" },
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+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "partd", marker = "sys_platform == 'linux'" },
+    { name = "pyyaml", marker = "sys_platform == 'linux'" },
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 array = [
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 dataframe = [
-    { name = "numpy" },
-    { name = "pandas" },
-    { name = "pyarrow" },
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+    { name = "pandas", marker = "sys_platform == 'linux'" },
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-    { name = "scipy" },
-    { name = "tifffile" },
+    { name = "dask", extra = ["array", "dataframe"], marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "pandas", marker = "sys_platform == 'linux'" },
+    { name = "pims", marker = "sys_platform == 'linux'" },
+    { name = "scipy", marker = "sys_platform == 'linux'" },
+    { name = "tifffile", marker = "sys_platform == 'linux'" },
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 version = "6.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "pytz" },
-    { name = "zope-interface" },
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+    { name = "zope-interface", marker = "sys_platform == 'linux'" },
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-    { name = "jeepney" },
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-    { name = "modopt" },
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-    { name = "skaha" },
-    { name = "sqlitedict" },
-    { name = "termcolor" },
-    { name = "tqdm" },
-    { name = "vos" },
+    { name = "astropy", marker = "sys_platform == 'linux'" },
+    { name = "astroquery", marker = "sys_platform == 'linux'" },
+    { name = "canfar", marker = "sys_platform == 'linux'" },
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+    { name = "galsim", marker = "sys_platform == 'linux'" },
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+    { name = "healsparse", marker = "sys_platform == 'linux'" },
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+    { name = "joblib", marker = "sys_platform == 'linux'" },
+    { name = "matplotlib", marker = "sys_platform == 'linux'" },
+    { name = "mccd", marker = "sys_platform == 'linux'" },
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+    { name = "python-dateutil", marker = "sys_platform == 'linux'" },
+    { name = "python-pysap", marker = "sys_platform == 'linux'" },
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+    { name = "sf-tools", marker = "sys_platform == 'linux'" },
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 sdist = { url = "https://files.pythonhosted.org/packages/8a/11/965c6fd8e5cc254f1fe142d547387da17a8ebfd75a3455f637c663fb38a0/terminado-0.18.1.tar.gz", hash = "sha256:de09f2c4b85de4765f7714688fff57d3e75bad1f909b589fde880460c753fd2e", size = 32701, upload-time = "2024-03-12T14:34:39.026Z" }
 wheels = [
@@ -3977,7 +3981,7 @@ name = "tifffile"
 version = "2026.4.11"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "numpy" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/d7/4a/e687f5957fead200faad58dbf9c9431a2bbb118040e96f5fb8a55f7ebc50/tifffile-2026.4.11.tar.gz", hash = "sha256:17758ff0c0d4db385792a083ad3ca51fcb0f4d942642f4d8f8bc1287fdcf17bc", size = 394956, upload-time = "2026-04-12T01:57:28.793Z" }
 wheels = [
@@ -3989,7 +3993,7 @@ name = "tinycss2"
 version = "1.4.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "webencodings" },
+    { name = "webencodings", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/7a/fd/7a5ee21fd08ff70d3d33a5781c255cbe779659bd03278feb98b19ee550f4/tinycss2-1.4.0.tar.gz", hash = "sha256:10c0972f6fc0fbee87c3edb76549357415e94548c1ae10ebccdea16fb404a9b7", size = 87085, upload-time = "2024-10-24T14:58:29.895Z" }
 wheels = [
@@ -4049,15 +4053,15 @@ name = "twine"
 version = "6.2.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "id" },
-    { name = "keyring", marker = "platform_machine != 'ppc64le' and platform_machine != 's390x'" },
-    { name = "packaging" },
-    { name = "readme-renderer" },
-    { name = "requests" },
-    { name = "requests-toolbelt" },
-    { name = "rfc3986" },
-    { name = "rich" },
-    { name = "urllib3" },
+    { name = "id", marker = "sys_platform == 'linux'" },
+    { name = "keyring", marker = "platform_machine != 'ppc64le' and platform_machine != 's390x' and sys_platform == 'linux'" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "readme-renderer", marker = "sys_platform == 'linux'" },
+    { name = "requests", marker = "sys_platform == 'linux'" },
+    { name = "requests-toolbelt", marker = "sys_platform == 'linux'" },
+    { name = "rfc3986", marker = "sys_platform == 'linux'" },
+    { name = "rich", marker = "sys_platform == 'linux'" },
+    { name = "urllib3", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/e0/a8/949edebe3a82774c1ec34f637f5dd82d1cf22c25e963b7d63771083bbee5/twine-6.2.0.tar.gz", hash = "sha256:e5ed0d2fd70c9959770dce51c8f39c8945c574e18173a7b81802dab51b4b75cf", size = 172262, upload-time = "2025-09-04T15:43:17.255Z" }
 wheels = [
@@ -4069,10 +4073,10 @@ name = "typer"
 version = "0.25.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "annotated-doc" },
-    { name = "click" },
-    { name = "rich" },
-    { name = "shellingham" },
+    { name = "annotated-doc", marker = "sys_platform == 'linux'" },
+    { name = "click", marker = "sys_platform == 'linux'" },
+    { name = "rich", marker = "sys_platform == 'linux'" },
+    { name = "shellingham", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/7b/27/ede8cec7596e0041ba7e7b80b47d132562f56ff454313a16f6084e555c9f/typer-0.25.0.tar.gz", hash = "sha256:123eaf9f19bb40fd268310e12a542c0c6b4fab9c98d9d23342a01ff95e3ce930", size = 120150, upload-time = "2026-04-26T08:46:14.767Z" }
 wheels = [
@@ -4093,7 +4097,7 @@ name = "typing-inspection"
 version = "0.4.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/55/e3/70399cb7dd41c10ac53367ae42139cf4b1ca5f36bb3dc6c9d33acdb43655/typing_inspection-0.4.2.tar.gz", hash = "sha256:ba561c48a67c5958007083d386c3295464928b01faa735ab8547c5692e87f464", size = 75949, upload-time = "2025-10-01T02:14:41.687Z" }
 wheels = [
@@ -4132,9 +4136,9 @@ name = "vos"
 version = "3.6.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "aenum" },
-    { name = "cadcutils" },
-    { name = "html2text" },
+    { name = "aenum", marker = "sys_platform == 'linux'" },
+    { name = "cadcutils", marker = "sys_platform == 'linux'" },
+    { name = "html2text", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/3e/6c/445bbedf2f90e71c09ff890aa8b409af5d074b1578eef383117cbcdfd09a/vos-3.6.4.tar.gz", hash = "sha256:67e4e24689ee881124b6670d7d2fc6527cc404687fc527fffc20cf5b1bd4c0bd", size = 103445, upload-time = "2025-12-12T00:20:56.398Z" }
 wheels = [
@@ -4221,9 +4225,9 @@ name = "yte"
 version = "1.9.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "argparse-dataclass" },
-    { name = "dpath" },
-    { name = "pyyaml" },
+    { name = "argparse-dataclass", marker = "sys_platform == 'linux'" },
+    { name = "dpath", marker = "sys_platform == 'linux'" },
+    { name = "pyyaml", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/44/f5/7e44620e6e077bfe624b9a17c329b8e0d0159e176e1f1a93c2790428ab2c/yte-1.9.4.tar.gz", hash = "sha256:86a47e6d722cec9419a7ac88be57d0d6c4ce28f02860393b71a66f2c674069f6", size = 8101, upload-time = "2025-11-27T12:55:00.85Z" }
 wheels = [
@@ -4235,12 +4239,12 @@ name = "zarr"
 version = "3.1.6"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "donfig" },
-    { name = "google-crc32c" },
-    { name = "numcodecs" },
-    { name = "numpy" },
-    { name = "packaging" },
-    { name = "typing-extensions" },
+    { name = "donfig", marker = "sys_platform == 'linux'" },
+    { name = "google-crc32c", marker = "sys_platform == 'linux'" },
+    { name = "numcodecs", marker = "sys_platform == 'linux'" },
+    { name = "numpy", marker = "sys_platform == 'linux'" },
+    { name = "packaging", marker = "sys_platform == 'linux'" },
+    { name = "typing-extensions", marker = "sys_platform == 'linux'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/31/5a/b8a0cf39a14c770c30bd1f2d120c54000c8cd9e84e8e79f38d9a7ce58071/zarr-3.1.6.tar.gz", hash = "sha256:d95e72cbea4b90e9a70679468b8266400331756232576ae2b43400ac5108d0eb", size = 386531, upload-time = "2026-03-23T17:25:18.748Z" }
 wheels = [

From 2788466ab6fbbebfacc341b38f0fa4dbc45a9f57 Mon Sep 17 00:00:00 2001
From: Cail Daley <cail.daley@cea.fr>
Date: Thu, 16 Jul 2026 17:46:04 +0200
Subject: [PATCH 2/4] feat(mask_ext): rasterize external healsparse masks to
 pipeline flag images

New mask_ext module (PRD in #847): reads the image WCS, evaluates the
pixel grid in memory-bounded row chunks, queries the healsparse map,
applies a config-driven bit->flag mapping, optionally sums the external
instrument flag (matching Mask._build_final_mask semantics), and writes
the standard int16 <PREFIX>_flag<num>.fits. Same module serves tiles and
exposure CCDs; mask files and bit meanings live only in config. Example
tile/exposure configs; 7 unit tests on synthetic maps (bit mapping,
chunk-seam independence, RA wrap, off-map, ext-flag sum, WCS round-trip).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CfRuCQa2UHo44yp2MZDsJX
---
 example/cfis/config_exp_MaExt.ini             |  50 +++
 example/cfis/config_tile_MaExt.ini            |  51 +++
 .../modules/mask_ext_package/__init__.py      |  71 ++++
 .../modules/mask_ext_package/mask_ext.py      | 319 ++++++++++++++++++
 src/shapepipe/modules/mask_ext_runner.py      | 117 +++++++
 tests/module/test_mask_ext.py                 | 230 +++++++++++++
 6 files changed, 838 insertions(+)
 create mode 100644 example/cfis/config_exp_MaExt.ini
 create mode 100644 example/cfis/config_tile_MaExt.ini
 create mode 100644 src/shapepipe/modules/mask_ext_package/__init__.py
 create mode 100644 src/shapepipe/modules/mask_ext_package/mask_ext.py
 create mode 100644 src/shapepipe/modules/mask_ext_runner.py
 create mode 100644 tests/module/test_mask_ext.py

diff --git a/example/cfis/config_exp_MaExt.ini b/example/cfis/config_exp_MaExt.ini
new file mode 100644
index 00000000..ecd416e1
--- /dev/null
+++ b/example/cfis/config_exp_MaExt.ini
@@ -0,0 +1,50 @@
+## ShapePipe configuration file for exposure-CCD external-mask (healsparse)
+## rasterization. Reprojects the unified UNIONS healsparse mask through each
+## single-exposure single-CCD WCS and sums in the instrument flag file,
+## producing the pipeline_flag<num>.fits artifact consumed downstream.
+
+[DEFAULT]
+VERBOSE = True
+RUN_NAME = run_sp_exp_MaExt
+RUN_DATETIME = False
+
+[EXECUTION]
+MODULE = mask_ext_runner
+MODE = SMP
+
+[FILE]
+LOG_NAME = log_sp_exp
+RUN_LOG_NAME = log_run_sp
+INPUT_DIR = $SP_RUN/output
+OUTPUT_DIR = $SP_RUN/output
+
+[JOB]
+SMP_BATCH_SIZE = 1
+TIMEOUT = 96:00:00
+
+[MASK_EXT_RUNNER]
+
+# Parent module: single-exposure single-CCD images and instrument flags
+INPUT_DIR = last:split_exp_runner
+
+# Update numbering convention, accounting for HDU number of
+# single-exposure single-HDU files
+NUMBERING_SCHEME = -0000000-0
+
+# Path of the external healsparse mask file (band-agnostic; r-band for shear)
+MASK_PATH = $SP_CONFIG/mask_r.hsp
+
+# Healsparse bit value -> output flag value mapping
+BIT_FLAG_MAP = 64:1
+
+# Flag value for pixels outside the healsparse footprint (0 = unflagged)
+OFF_MAP_FLAG = 0
+
+# External instrument flag file: summed into the rasterized mask
+USE_EXT_FLAG = True
+
+# HDU of the external instrument flag FITS file (optional, default 0)
+HDU = 0
+
+# File name prefix for the output flag files
+PREFIX = pipeline
diff --git a/example/cfis/config_tile_MaExt.ini b/example/cfis/config_tile_MaExt.ini
new file mode 100644
index 00000000..410a6890
--- /dev/null
+++ b/example/cfis/config_tile_MaExt.ini
@@ -0,0 +1,51 @@
+## ShapePipe configuration file for tile external-mask (healsparse) rasterization
+## Rasterizes the unified UNIONS healsparse mask onto each tile pixel grid,
+## producing the pipeline_flag<num>.fits artifact consumed downstream.
+
+[DEFAULT]
+VERBOSE = True
+RUN_NAME = run_sp_tile_MaExt
+RUN_DATETIME = False
+
+[EXECUTION]
+MODULE = mask_ext_runner
+MODE = SMP
+
+[FILE]
+LOG_NAME = log_sp_exp
+RUN_LOG_NAME = log_run_sp
+INPUT_DIR = $SP_RUN/output
+OUTPUT_DIR = $SP_RUN/output
+
+[JOB]
+SMP_BATCH_SIZE = 1
+TIMEOUT = 96:00:00
+
+[MASK_EXT_RUNNER]
+
+# Input directory, tile image
+INPUT_DIR = run_sp_tile_Git:get_images_runner, last:uncompress_fits_runner
+
+# NUMBERING_SCHEME (optional) string with numbering pattern for input files
+NUMBERING_SCHEME = -000-000
+
+# Input file pattern(s): only the tile image is needed (WCS + pixel grid)
+FILE_PATTERN = CFIS_image
+
+# FILE_EXT (optional) list of string extensions to identify input files
+FILE_EXT = .fits
+
+# Path of the external healsparse mask file (band-agnostic; r-band for shear)
+MASK_PATH = $SP_CONFIG/mask_r.hsp
+
+# Healsparse bit value -> output flag value mapping
+BIT_FLAG_MAP = 64:1
+
+# Flag value for pixels outside the healsparse footprint (0 = unflagged)
+OFF_MAP_FLAG = 0
+
+# No external instrument flag for tiles
+USE_EXT_FLAG = False
+
+# File name prefix for the output flag files
+PREFIX = pipeline
diff --git a/src/shapepipe/modules/mask_ext_package/__init__.py b/src/shapepipe/modules/mask_ext_package/__init__.py
new file mode 100644
index 00000000..4e212398
--- /dev/null
+++ b/src/shapepipe/modules/mask_ext_package/__init__.py
@@ -0,0 +1,71 @@
+"""MASK EXT MODULE.
+
+This package contains the module for ``mask_ext``.
+
+:Author: Cail Daley
+
+:Parent module: ``split_exp_runner`` (exposures) or ``get_images_runner`` /
+                ``uncompress_fits_runner`` (tiles), or None
+
+:Input: Single image (tile or single-exposure single-CCD) and, optionally, an
+        external instrument flag file
+
+:Output: Per-image pixel flag file
+
+Description
+===========
+
+This module produces the ShapePipe per-image pixel flag file
+``<PREFIX>_flag<num>.fits`` by rasterizing an **external healsparse mask** onto
+the image pixel grid, rather than generating masks internally (the job of the
+``mask`` module). It is the ShapePipe consumer of the unified UNIONS healsparse
+mask products (PhotoPipe footprint + bright stars, MaxiMask, manual galaxy
+masks), merged and stored as ``healsparse.HealSparseMap`` files.
+
+For each image the module:
+
+1. Reads the image header into an ``astropy.wcs.WCS``.
+2. Evaluates the pixel grid to (RA, Dec) in row chunks (bounded memory).
+3. Queries ``HealSparseMap.get_values_pos`` at every pixel centre.
+4. Maps healsparse bit values to ShapePipe flag values through the
+   config-driven ``BIT_FLAG_MAP``, producing an ``int16`` flag image.
+5. Optionally sums in an external instrument flag image (``USE_EXT_FLAG``),
+   matching the combination semantics of the ``mask`` module.
+6. Writes ``<PREFIX>_flag<num>.fits`` carrying the image WCS in its header.
+
+Everything downstream (SExtractor ``IMAFLAGS_ISO``, setools star selection,
+vignetmaker, ngmix) consumes this artifact unchanged; the module is a drop-in
+replacement for ``mask`` at the flag-image contract.
+
+The same module serves tiles and exposure CCDs: only the input image (hence
+WCS) differs. The healsparse file, its bit meanings, and all flag values live
+**only in config** — the mask products evolve and are swapped at zero code cost.
+
+Module-specific config file entries
+===================================
+
+MASK_PATH : str
+    Path to the healsparse mask file (``.hsp``/``.fits``); band-agnostic
+BIT_FLAG_MAP : str
+    Mapping from healsparse pixel bit value to output flag value, formatted as
+    ``"<bit>:<flag>, <bit>:<flag>, ..."`` (e.g. ``"64:1, 2048:2"``). A pixel
+    carrying several bits receives the bitwise-OR of the mapped flag values.
+OFF_MAP_FLAG : int, optional
+    Flag value assigned to pixels that fall outside the healsparse map
+    footprint (sentinel pixels); default is ``0``. Off-footprint pixels are
+    usually unobserved, so a non-zero value flags them.
+USE_EXT_FLAG : bool, optional
+    If ``True``, sum an external instrument flag file (given as the second
+    input) into the rasterized mask; default is ``False``. Needed for
+    exposures, where saturation / bleeding / bad columns arrive with the data.
+HDU : int, optional
+    HDU of the external instrument flag FITS file; default is ``0``
+PREFIX : str, optional
+    Prefix prepended to the output file name base ``flag``; default is ``""``
+CHUNK_SIZE : int, optional
+    Number of image rows evaluated per chunk; default is chosen from the image
+    size to bound memory (``1e8`` px for tiles, ``1e7`` px for exposure CCDs)
+
+"""
+
+__all__ = ["mask_ext"]
diff --git a/src/shapepipe/modules/mask_ext_package/mask_ext.py b/src/shapepipe/modules/mask_ext_package/mask_ext.py
new file mode 100644
index 00000000..4edc2a12
--- /dev/null
+++ b/src/shapepipe/modules/mask_ext_package/mask_ext.py
@@ -0,0 +1,319 @@
+"""MASK EXT.
+
+This module contains a class to rasterize an external healsparse mask onto an
+image pixel grid, producing the ShapePipe per-image pixel flag file.
+
+:Author: Cail Daley
+
+"""
+
+import re
+
+import numpy as np
+from astropy import wcs
+
+from shapepipe.pipeline import file_io
+
+# Per-chunk pixel budget: chunk the image in row bands so that no more than
+# this many pixel coordinates are held / queried at once. A tile is ~1e8 px and
+# an exposure CCD ~1e7 px; this bound keeps peak memory to a single band.
+DEFAULT_PIXEL_BUDGET = 10_000_000
+
+
+class MaskExt(object):
+    """Mask Ext.
+
+    Rasterize an external healsparse mask onto an image pixel grid and write
+    the resulting ShapePipe flag file.
+
+    Parameters
+    ----------
+    image_path : str
+        Path to the image whose pixel grid and WCS define the output
+    mask_path : str
+        Path to the external healsparse mask file
+    bit_flag_map : dict
+        Mapping from healsparse pixel bit value (int) to output flag value
+        (int); a pixel carrying several bits gets the bitwise-OR of the mapped
+        flags
+    image_num : str
+        File number string, inserted into the output file name
+    output_dir : str
+        Path to the output directory
+    w_log : logging.Logger
+        Log file
+    off_map_flag : int, optional
+        Flag value for pixels outside the healsparse footprint (sentinel
+        pixels); default is ``0``
+    path_external_flag : str, optional
+        Path to an external instrument flag file to sum into the mask; default
+        is ``None`` (not used)
+    image_prefix : str, optional
+        Prefix prepended to the output file name base ``flag``; specify
+        ``'none'`` or ``''`` for no prefix, default is ``''``
+    outname_base : str, optional
+        Output file name base, default is ``flag``
+    chunk_size : int, optional
+        Number of image rows evaluated per chunk; default is derived from the
+        image width and :data:`DEFAULT_PIXEL_BUDGET`
+    hdu : int, optional
+        HDU of the external instrument flag FITS file; default is ``0``
+
+    """
+
+    def __init__(
+        self,
+        image_path,
+        mask_path,
+        bit_flag_map,
+        image_num,
+        output_dir,
+        w_log,
+        off_map_flag=0,
+        path_external_flag=None,
+        image_prefix="",
+        outname_base="flag",
+        chunk_size=None,
+        hdu=0,
+    ):
+        self._image_path = image_path
+        self._mask_path = mask_path
+        self._bit_flag_map = bit_flag_map
+        self._img_number = image_num
+        self._output_dir = output_dir
+        self._w_log = w_log
+        self._off_map_flag = int(off_map_flag)
+        self._path_external_flag = path_external_flag
+
+        if (image_prefix.lower() != "none") and (image_prefix != ""):
+            self._img_prefix = f"{image_prefix}_"
+        else:
+            self._img_prefix = ""
+
+        self._outname_base = outname_base
+        self._chunk_size = chunk_size
+        self._hdu = hdu
+
+        self._set_image_coordinates()
+
+    @staticmethod
+    def parse_bit_flag_map(map_string):
+        """Parse Bit Flag Map.
+
+        Parse the ``BIT_FLAG_MAP`` config string into a dictionary.
+
+        Parameters
+        ----------
+        map_string : str
+            Mapping formatted as ``"<bit>:<flag>, <bit>:<flag>, ..."``, e.g.
+            ``"64:1, 2048:2"``
+
+        Returns
+        -------
+        dict
+            Mapping from healsparse bit value (int) to output flag value (int)
+
+        Raises
+        ------
+        ValueError
+            If an entry is not of the form ``<int>:<int>``
+
+        """
+        bit_flag_map = {}
+        for entry in map_string.split(","):
+            entry = entry.strip()
+            if not entry:
+                continue
+            if not re.fullmatch(r"\d+\s*:\s*\d+", entry):
+                raise ValueError(
+                    f"Invalid BIT_FLAG_MAP entry '{entry}'; expected "
+                    + "'<bit>:<flag>'"
+                )
+            bit, flag = (int(part) for part in entry.split(":"))
+            bit_flag_map[bit] = flag
+        if not bit_flag_map:
+            raise ValueError("BIT_FLAG_MAP is empty")
+        return bit_flag_map
+
+    def _set_image_coordinates(self):
+        """Set Image Coordinates.
+
+        Read the image header into a WCS and record the image shape, mirroring
+        ``Mask._set_image_coordinates``.
+
+        """
+        img = file_io.FITSCatalogue(self._image_path, hdu_no=0)
+        img.open()
+        self._header = img.get_header()
+        # get_data().shape is (n_y, n_x)
+        self._img_shape = img.get_data().shape
+        img.close()
+        del img
+
+        self._wcs = wcs.WCS(self._header)
+
+    def _default_chunk_size(self):
+        """Default Chunk Size.
+
+        Rows per chunk such that one band holds at most
+        :data:`DEFAULT_PIXEL_BUDGET` pixels.
+
+        Returns
+        -------
+        int
+            Number of rows per chunk (at least 1)
+
+        """
+        n_x = self._img_shape[1]
+        return max(1, DEFAULT_PIXEL_BUDGET // n_x)
+
+    def _map_bits_to_flags(self, bit_values, off_map):
+        """Map Bits to Flags.
+
+        Translate healsparse bit values to output flag values through the
+        bit→flag mapping, OR-combining every matching bit, and assign the
+        off-map flag to sentinel pixels.
+
+        Parameters
+        ----------
+        bit_values : numpy.ndarray
+            Healsparse values queried at the pixel centres
+        off_map : numpy.ndarray
+            Boolean mask, ``True`` where the pixel lies outside the footprint
+
+        Returns
+        -------
+        numpy.ndarray
+            Output flag values (``int16``), same shape as ``bit_values``
+
+        """
+        flags = np.zeros(bit_values.shape, dtype=np.int16)
+        for bit, flag in self._bit_flag_map.items():
+            flags[(bit_values & bit) != 0] |= np.int16(flag)
+        if self._off_map_flag != 0:
+            flags[off_map] = np.int16(self._off_map_flag)
+        return flags
+
+    def rasterize(self):
+        """Rasterize.
+
+        Evaluate the pixel grid to (RA, Dec) in row chunks, query the
+        healsparse mask, and build the ``int16`` flag image.
+
+        Returns
+        -------
+        numpy.ndarray
+            The rasterized flag image, shape ``(n_y, n_x)``, dtype ``int16``
+
+        """
+        # Lazy import: healsparse is an optional heavy dependency, imported at
+        # use rather than module load.
+        import healsparse
+
+        hmap = healsparse.HealSparseMap.read(self._mask_path)
+        sentinel = hmap.sentinel
+
+        n_y, n_x = self._img_shape
+        chunk_size = self._chunk_size or self._default_chunk_size()
+
+        flag_image = np.zeros((n_y, n_x), dtype=np.int16)
+        # Column indices are shared across every row band.
+        x = np.arange(n_x)
+
+        for y0 in range(0, n_y, chunk_size):
+            y1 = min(y0 + chunk_size, n_y)
+            yy, xx = np.meshgrid(np.arange(y0, y1), x, indexing="ij")
+            # WCS uses 0-based pixel coordinates here (origin=0).
+            ra, dec = self._wcs.all_pix2world(xx.ravel(), yy.ravel(), 0)
+            # Normalize RA into [0, 360) so the wrap at 0/360 is handled;
+            # healsparse expects lon in that range with lonlat=True.
+            ra = np.mod(ra, 360.0)
+
+            bit_values = hmap.get_values_pos(ra, dec, lonlat=True)
+            off_map = bit_values == sentinel
+
+            band = self._map_bits_to_flags(bit_values, off_map)
+            flag_image[y0:y1, :] = band.reshape(y1 - y0, n_x)
+
+        return flag_image
+
+    def _combine_external_flag(self, flag_image):
+        """Combine External Flag.
+
+        Sum an external instrument flag image into the rasterized mask,
+        matching ``Mask._build_final_mask`` semantics (element-wise sum of the
+        two integer flag images).
+
+        Parameters
+        ----------
+        flag_image : numpy.ndarray
+            The rasterized flag image
+
+        Returns
+        -------
+        numpy.ndarray
+            The combined flag image (``int16``)
+
+        """
+        external_flag = file_io.FITSCatalogue(
+            self._path_external_flag,
+            hdu_no=self._hdu,
+        )
+        external_flag.open()
+        ext_flag = external_flag.get_data()[:, :]
+        external_flag.close()
+
+        return (flag_image + ext_flag).astype(np.int16, copy=False)
+
+    def _output_path(self):
+        """Output Path.
+
+        Full path of the output flag file, matching the ``mask`` module naming
+        (``<PREFIX>_flag<num>.fits``).
+
+        Returns
+        -------
+        str
+            Output file path
+
+        """
+        name = (
+            f"{self._img_prefix}{self._outname_base}"
+            + f"{self._img_number}.fits"
+        )
+        return f"{self._output_dir}/{name}"
+
+    def make_mask(self):
+        """Make Mask.
+
+        Rasterize the healsparse mask, optionally combine the external
+        instrument flag, and write the flag file carrying the image WCS.
+
+        Returns
+        -------
+        str
+            Path to the written flag file
+
+        """
+        flag_image = self.rasterize()
+
+        if self._path_external_flag is not None:
+            flag_image = self._combine_external_flag(flag_image)
+
+        output_path = self._output_path()
+        out = file_io.FITSCatalogue(
+            output_path,
+            open_mode=file_io.BaseCatalogue.OpenMode.ReadWrite,
+            hdu_no=0,
+        )
+        out.save_as_fits(
+            data=flag_image,
+            image=True,
+            image_header=self._wcs.to_header(),
+        )
+
+        self._w_log.info(
+            f"Wrote healsparse-derived flag file {output_path}"
+        )
+
+        return output_path
diff --git a/src/shapepipe/modules/mask_ext_runner.py b/src/shapepipe/modules/mask_ext_runner.py
new file mode 100644
index 00000000..a43265d1
--- /dev/null
+++ b/src/shapepipe/modules/mask_ext_runner.py
@@ -0,0 +1,117 @@
+"""MASK EXT RUNNER.
+
+Module runner for ``mask_ext``.
+
+:Author: Cail Daley
+
+"""
+
+from shapepipe.modules.mask_ext_package.mask_ext import MaskExt
+from shapepipe.modules.module_decorator import module_runner
+
+
+@module_runner(
+    version="1.0",
+    file_pattern=["image", "flag"],
+    file_ext=[".fits", ".fits"],
+    depends=["numpy", "astropy", "healsparse"],
+    numbering_scheme="_0",
+)
+def mask_ext_runner(
+    input_file_list,
+    run_dirs,
+    file_number_string,
+    config,
+    module_config_sec,
+    w_log,
+):
+    """Define The Mask Ext Runner.
+
+    Rasterize an external healsparse mask onto the input image pixel grid and
+    write the ShapePipe flag file.
+
+    Notes
+    -----
+    Only the image is strictly required: it supplies the pixel grid and WCS
+    onto which the healsparse mask is rasterized. Unlike the ``mask`` module,
+    no weight file is used — the healsparse mask already encodes the footprint,
+    and missing-data handling is not this module's concern. A second input, an
+    external instrument flag file, is consumed only when ``USE_EXT_FLAG`` is
+    ``True`` (needed for exposures, where saturation / bleeding / bad columns
+    arrive with the data).
+
+    """
+    n_inputs = len(input_file_list)
+    use_ext_flag = config.getboolean(module_config_sec, "USE_EXT_FLAG") if (
+        config.has_option(module_config_sec, "USE_EXT_FLAG")
+    ) else False
+
+    if use_ext_flag:
+        if n_inputs != 2:
+            raise ValueError(
+                f"Found {n_inputs} inputs but USE_EXT_FLAG is True, which "
+                + 'expects "image" and "flag" in the MASK_EXT_RUNNER section '
+                + "of the config file."
+            )
+        image_path = input_file_list[0]
+        ext_flag_name = input_file_list[1]
+    else:
+        if n_inputs != 1:
+            raise ValueError(
+                f"Found {n_inputs} inputs but USE_EXT_FLAG is False, which "
+                + 'expects only "image" in the MASK_EXT_RUNNER section of the '
+                + "config file."
+            )
+        image_path = input_file_list[0]
+        ext_flag_name = None
+
+    # Path to the healsparse mask file
+    mask_path = config.getexpanded(module_config_sec, "MASK_PATH")
+
+    # Bit -> flag mapping
+    bit_flag_map = MaskExt.parse_bit_flag_map(
+        config.get(module_config_sec, "BIT_FLAG_MAP")
+    )
+
+    # Flag value for pixels outside the healsparse footprint
+    if config.has_option(module_config_sec, "OFF_MAP_FLAG"):
+        off_map_flag = config.getint(module_config_sec, "OFF_MAP_FLAG")
+    else:
+        off_map_flag = 0
+
+    # HDU of the external instrument flag file
+    if config.has_option(module_config_sec, "HDU"):
+        hdu = config.getint(module_config_sec, "HDU")
+    else:
+        hdu = 0
+
+    # Output file name prefix
+    if config.has_option(module_config_sec, "PREFIX"):
+        prefix = config.get(module_config_sec, "PREFIX")
+    else:
+        prefix = ""
+
+    # Rows per chunk (optional; default derived from image size)
+    if config.has_option(module_config_sec, "CHUNK_SIZE"):
+        chunk_size = config.getint(module_config_sec, "CHUNK_SIZE")
+    else:
+        chunk_size = None
+
+    mask_inst = MaskExt(
+        image_path,
+        mask_path,
+        bit_flag_map,
+        file_number_string,
+        run_dirs["output"],
+        w_log,
+        off_map_flag=off_map_flag,
+        path_external_flag=ext_flag_name,
+        image_prefix=prefix.replace(" ", ""),
+        outname_base="flag",
+        chunk_size=chunk_size,
+        hdu=hdu,
+    )
+
+    mask_inst.make_mask()
+
+    return None, None
diff --git a/tests/module/test_mask_ext.py b/tests/module/test_mask_ext.py
new file mode 100644
index 00000000..f1843f2c
--- /dev/null
+++ b/tests/module/test_mask_ext.py
@@ -0,0 +1,230 @@
+"""UNIT TESTS FOR MODULE PACKAGE: MASK_EXT.
+
+Drives ``MaskExt`` against a synthetic healsparse map and a synthetic TAN WCS
+to lock in the rasterization contract of ``mask_ext_runner``: the config-driven
+bit->flag mapping (with bitwise-OR of multiple bits), chunk-seam independence,
+RA wrap across 0/360, off-footprint (sentinel) handling, external-flag summing,
+``int16`` output dtype, and WCS round-trip in the written FITS.
+
+The synthetic map is a high-resolution healsparse map covering only a tiny
+patch on the sky; the synthetic WCS points an image at that patch so a subset
+of pixels land on masked healpix cells and the rest fall off the footprint.
+"""
+
+import numpy as np
+import numpy.testing as npt
+import pytest
+from astropy.io import fits
+from astropy.wcs import WCS
+
+healsparse = pytest.importorskip("healsparse")
+hpgeom = pytest.importorskip("hpgeom")
+
+from shapepipe.modules.mask_ext_package.mask_ext import MaskExt
+
+
+class _NullLogger:
+    def info(self, *_args, **_kwargs):
+        pass
+
+
+# Sky patch the synthetic image and mask share.
+CRVAL1 = 150.0
+CRVAL2 = 2.3
+NSIDE_SPARSE = 131072  # ~1.6 arcsec, matching the real UNIONS masks
+NSIDE_COVERAGE = 32
+PIXSCALE_DEG = 0.187 / 3600.0  # UNIONS ~0.187"/px
+
+
+def _make_wcs(naxis1, naxis2, crval1=CRVAL1, crval2=CRVAL2):
+    """Synthetic TAN WCS header centred on the shared patch."""
+    w = WCS(naxis=2)
+    w.wcs.ctype = ["RA---TAN", "DEC--TAN"]
+    w.wcs.crval = [crval1, crval2]
+    w.wcs.crpix = [naxis1 / 2 + 0.5, naxis2 / 2 + 0.5]
+    w.wcs.cd = [[-PIXSCALE_DEG, 0.0], [0.0, PIXSCALE_DEG]]
+    return w
+
+
+def _write_image(path, wcs_obj, naxis1, naxis2):
+    """Write a zero-valued image carrying the given WCS (defines pixel grid)."""
+    data = np.zeros((naxis2, naxis1), dtype=np.float32)
+    hdu = fits.PrimaryHDU(data)
+    # NAXIS* are set from the data shape; merge only the WCS keywords.
+    hdu.header.update(wcs_obj.to_header())
+    hdu.writeto(path, overwrite=True)
+
+
+def _make_map(masked_ra, masked_dec, bits, sentinel=0):
+    """Healsparse int32 map with the given (ra, dec) cells set to ``bits``."""
+    hmap = healsparse.HealSparseMap.make_empty(
+        NSIDE_COVERAGE, NSIDE_SPARSE, dtype=np.int32, sentinel=sentinel
+    )
+    pix = hpgeom.angle_to_pixel(NSIDE_SPARSE, masked_ra, masked_dec)
+    bits = np.asarray(bits, dtype=np.int32)
+    # Several fine image pixels can share one healpix cell; keep the first bit
+    # value per unique cell (replace requires unique pixels).
+    pix, first = np.unique(pix, return_index=True)
+    hmap[pix] = bits[first]
+    return hmap
+
+
+def _run(tmp_path, image_wcs, naxis1, naxis2, hmap, bit_flag_map,
+         off_map_flag=0, chunk_size=None, path_external_flag=None):
+    """Instantiate MaskExt on written synthetic inputs and rasterize/write."""
+    image_path = str(tmp_path / "image.fits")
+    mask_path = str(tmp_path / "mask.hsp")
+    _write_image(image_path, image_wcs, naxis1, naxis2)
+    hmap.write(mask_path, clobber=True)
+
+    inst = MaskExt(
+        image_path,
+        mask_path,
+        bit_flag_map,
+        image_num="-000-000",
+        output_dir=str(tmp_path),
+        w_log=_NullLogger(),
+        off_map_flag=off_map_flag,
+        path_external_flag=path_external_flag,
+        image_prefix="pipeline",
+        chunk_size=chunk_size,
+    )
+    return inst
+
+
+def test_parse_bit_flag_map():
+    """String config parses into an int->int dict; malformed entries raise."""
+    assert MaskExt.parse_bit_flag_map("64:1, 2048:2") == {64: 1, 2048: 2}
+    assert MaskExt.parse_bit_flag_map(" 64 : 1 ") == {64: 1}
+    with pytest.raises(ValueError):
+        MaskExt.parse_bit_flag_map("64")
+    with pytest.raises(ValueError):
+        MaskExt.parse_bit_flag_map("")
+
+
+def test_bit_flag_mapping_and_off_map(tmp_path):
+    """Masked cells map their bit; unmasked (off-footprint) get off_map_flag.
+
+    The image centre pixel lands on a cell carrying bit 64 -> flag 1; the map
+    covers only that centre cell, so every other pixel is off-footprint.
+    """
+    naxis1 = naxis2 = 16
+    w = _make_wcs(naxis1, naxis2)
+    # RA/Dec at the central pixel (0-based grid, origin=0).
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    hmap = _make_map([float(ra_c)], [float(dec_c)], [64])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1}, off_map_flag=8)
+    flags = inst.rasterize()
+
+    assert flags.dtype == np.int16
+    assert flags.shape == (naxis2, naxis1)
+    # The centre cell is flagged 1; the rest of the image is off the footprint.
+    n_flagged_1 = np.sum(flags == 1)
+    assert n_flagged_1 >= 1
+    assert np.all(flags[flags != 1] == 8)
+    assert np.sum(flags == 8) == flags.size - n_flagged_1
+
+
+def test_multi_bit_or(tmp_path):
+    """A cell carrying two bits gets the bitwise-OR of the mapped flags."""
+    naxis1 = naxis2 = 8
+    w = _make_wcs(naxis1, naxis2)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    # bit values 64 and 2048 set together on the centre cell.
+    hmap = _make_map([float(ra_c)], [float(dec_c)], [64 | 2048])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1, 2048: 2})
+    flags = inst.rasterize()
+    # 1 | 2 == 3 on the masked cell.
+    assert 3 in np.unique(flags)
+    assert np.all(np.isin(np.unique(flags), [0, 3]))
+
+
+def test_chunk_seam_independence(tmp_path):
+    """Result is independent of chunk size (no seam artifacts)."""
+    naxis1 = naxis2 = 40
+    w = _make_wcs(naxis1, naxis2)
+    # Mask a band of cells spanning several image rows.
+    ys = np.arange(0, naxis2)
+    xs = np.full_like(ys, naxis1 // 2)
+    ra, dec = w.all_pix2world(xs, ys, 0)
+    hmap = _make_map(ra.astype(float), dec.astype(float), [64] * len(ys))
+
+    inst_full = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1})
+    full = inst_full.rasterize()
+
+    for cs in (1, 3, 7, 40):
+        inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1}, chunk_size=cs)
+        npt.assert_array_equal(inst.rasterize(), full)
+    # Sanity: some pixels actually got flagged.
+    assert np.any(full == 1)
+
+
+def test_ra_wrap(tmp_path):
+    """RA-wrap near 0/360: an image centred on RA~0 rasterizes correctly."""
+    naxis1 = naxis2 = 16
+    w = _make_wcs(naxis1, naxis2, crval1=0.0, crval2=2.3)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    # Straddling pixels produce RA both just below 360 and just above 0; the
+    # map cell is queried by its wrapped-into-[0,360) coordinate.
+    hmap = _make_map([float(np.mod(ra_c, 360.0))], [float(dec_c)], [64])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1})
+    flags = inst.rasterize()
+    # No crash, correct dtype, and the centre is flagged despite the wrap.
+    assert flags.dtype == np.int16
+    assert np.any(flags == 1)
+
+
+def test_external_flag_summing(tmp_path):
+    """External instrument flag image is summed into the rasterized mask."""
+    naxis1 = naxis2 = 8
+    w = _make_wcs(naxis1, naxis2)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    hmap = _make_map([float(ra_c)], [float(dec_c)], [64])
+
+    # External flag: a constant field of 16 (e.g. a saturation bit).
+    ext_path = str(tmp_path / "ext_flag.fits")
+    ext_data = np.full((naxis2, naxis1), 16, dtype=np.int16)
+    fits.PrimaryHDU(ext_data).writeto(ext_path, overwrite=True)
+
+    inst = _run(
+        tmp_path, w, naxis1, naxis2, hmap, {64: 1},
+        path_external_flag=ext_path,
+    )
+    out_path = inst.make_mask()
+
+    with fits.open(out_path) as hdul:
+        written = hdul[0].data
+
+    # FITS stores big-endian; still a 2-byte signed int (int16).
+    assert written.dtype.kind == "i" and written.dtype.itemsize == 2
+    # Every pixel gets +16 from the external flag; the centre cell also +1.
+    assert np.all(written >= 16)
+    assert 17 in np.unique(written)
+
+
+def test_write_wcs_roundtrip(tmp_path):
+    """Written FITS carries the image WCS; pix2world round-trips."""
+    naxis1 = naxis2 = 12
+    w = _make_wcs(naxis1, naxis2)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    hmap = _make_map([float(ra_c)], [float(dec_c)], [64])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1})
+    out_path = inst.make_mask()
+
+    with fits.open(out_path) as hdul:
+        assert hdul[0].data.dtype.kind == "i"
+        assert hdul[0].data.dtype.itemsize == 2
+        w_out = WCS(hdul[0].header)
+
+    ra_in, dec_in = w.all_pix2world(cx, cy, 0)
+    ra_out, dec_out = w_out.all_pix2world(cx, cy, 0)
+    npt.assert_allclose([ra_in, dec_in], [ra_out, dec_out], rtol=0, atol=1e-9)

From 04003d2bb168f4fdd11632f669315948a4c28245 Mon Sep 17 00:00:00 2001
From: Cail Daley <cail.daley@cea.fr>
Date: Thu, 16 Jul 2026 17:46:06 +0200
Subject: [PATCH 3/4] feat(make_cat): per-band MASK_<BAND> columns from
 external healsparse maps
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Optional MASK_EXT_PATHS (band:path pairs, env-expanded) in the make_cat
section: each band's healsparse map is queried at object world positions
(XWIN_WORLD/YWIN_WORLD) and added as a MASK_<BAND> column — the ShapePipe
end of UNIONS-WL/spherex#38. Strict no-op when unset; off-map objects
carry the map sentinel (-1 for integer maps). 3 unit tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CfRuCQa2UHo44yp2MZDsJX
---
 .../modules/make_cat_package/make_cat.py      |  62 +++++++++
 src/shapepipe/modules/make_cat_runner.py      |  10 ++
 tests/module/test_make_cat_mask_ext.py        | 129 ++++++++++++++++++
 3 files changed, 201 insertions(+)
 create mode 100644 tests/module/test_make_cat_mask_ext.py

diff --git a/src/shapepipe/modules/make_cat_package/make_cat.py b/src/shapepipe/modules/make_cat_package/make_cat.py
index 32855bdd..d9fed353 100644
--- a/src/shapepipe/modules/make_cat_package/make_cat.py
+++ b/src/shapepipe/modules/make_cat_package/make_cat.py
@@ -209,6 +209,68 @@ def save_sm_data(
     return n_obj
 
 
+def parse_mask_ext_paths(paths_str):
+    """Parse Mask Ext Paths.
+
+    Parse the ``MASK_EXT_PATHS`` config value into a ``band -> path`` mapping.
+
+    Parameters
+    ----------
+    paths_str : str
+        Comma-separated ``band:path`` pairs, e.g.
+        ``u:/path/mask_u.hsp, g:/path/mask_g.hsp``
+
+    Returns
+    -------
+    dict
+        Mapping from band name to healsparse map path
+
+    """
+    band_paths = {}
+    for pair in paths_str.split(","):
+        band, path = pair.split(":", 1)
+        band_paths[band.strip()] = path.strip()
+
+    return band_paths
+
+
+def save_mask_ext_data(final_cat_file, band_paths, w_log):
+    """Save External Mask Data.
+
+    Query per-band external healsparse masks at each object's world position
+    and write one ``MASK_<BAND>`` column per band into the final catalogue.
+    Object positions are read from the SExtractor windowed world coordinates
+    (``XWIN_WORLD`` = RA, ``YWIN_WORLD`` = Dec, both in degrees) carried in the
+    ``RESULTS`` extension. Objects falling outside a map's coverage receive
+    that map's sentinel value (``healsparse.HealSparseMap.get_values_pos``
+    returns the map's sentinel — ``-1`` for integer maps — verbatim), which is
+    the documented off-map flag.
+
+    Parameters
+    ----------
+    final_cat_file : file_io.FITSCatalogue
+        Final catalogue
+    band_paths : dict
+        Mapping from band name to healsparse map path
+    w_log : logging.Logger
+        Logging instance
+
+    """
+    import healsparse
+
+    final_cat_file.open()
+    ra = np.copy(final_cat_file.get_data()["XWIN_WORLD"])
+    dec = np.copy(final_cat_file.get_data()["YWIN_WORLD"])
+
+    for band, path in band_paths.items():
+        w_log.info(f"Query external mask for band {band}: {path}")
+        mask_map = healsparse.HealSparseMap.read(path)
+        values = mask_map.get_values_pos(ra, dec, lonlat=True)
+        final_cat_file.add_col(f"MASK_{band}", np.asarray(values))
+
+    final_cat_file.close()
+
+
 class SaveCatalogue:
     """Save Catalogue.
 
diff --git a/src/shapepipe/modules/make_cat_runner.py b/src/shapepipe/modules/make_cat_runner.py
index 307dc2ff..17634175 100644
--- a/src/shapepipe/modules/make_cat_runner.py
+++ b/src/shapepipe/modules/make_cat_runner.py
@@ -137,4 +137,14 @@ def make_cat_runner(
     if save_psf:
         err_msg = sc_inst.process("psf", galaxy_psf_path)
 
+    # Optional per-band external healsparse mask lookup (UNIONS-WL/spherex#38):
+    # add one MASK_<BAND> column per band, queried at each object's world
+    # position. Absent config is a strict no-op.
+    if config.has_option(module_config_sec, "MASK_EXT_PATHS"):
+        band_paths = make_cat.parse_mask_ext_paths(
+            config.getexpanded(module_config_sec, "MASK_EXT_PATHS")
+        )
+        w_log.info("Save external mask data")
+        make_cat.save_mask_ext_data(final_cat_file, band_paths, w_log)
+
     return None, None
diff --git a/tests/module/test_make_cat_mask_ext.py b/tests/module/test_make_cat_mask_ext.py
new file mode 100644
index 00000000..91d0f515
--- /dev/null
+++ b/tests/module/test_make_cat_mask_ext.py
@@ -0,0 +1,129 @@
+"""UNIT TESTS FOR MODULE PACKAGE: MAKE_CAT external-mask columns.
+
+Exercises the optional per-band external healsparse mask lookup added to
+``make_cat`` (PR #847 §4, the ShapePipe end of UNIONS-WL/spherex#38). A small
+synthetic ``final_cat`` FITS carrying known ``XWIN_WORLD`` / ``YWIN_WORLD``
+object positions is queried against synthetic healsparse maps of known value,
+locking in: (1) the ``MASK_<BAND>`` column name and per-object values, (2) the
+off-map sentinel (``-1`` for integer maps) written verbatim for objects outside
+coverage, (3) multi-band handling, and (4) that absent config leaves the
+catalogue untouched.
+"""
+
+import numpy as np
+import numpy.testing as npt
+import pytest
+
+healsparse = pytest.importorskip("healsparse")
+
+from shapepipe.modules.make_cat_package import make_cat
+from shapepipe.pipeline import file_io
+
+
+class _NullLogger:
+    def info(self, *_args, **_kwargs):
+        pass
+
+
+NSIDE_COVERAGE = 32
+NSIDE_SPARSE = 4096
+
+# Object world positions (RA, Dec in degrees). The last object sits far from
+# the map coverage so it exercises the off-map sentinel path.
+RA = np.array([10.0, 10.1, 10.2, 200.0])
+DEC = np.array([20.0, 20.1, 20.2, -40.0])
+
+
+def _make_map(value, dtype=np.int16, sentinel=-1):
+    """Build a healsparse map covering the first three RA/Dec positions.
+
+    All covered pixels carry ``value``; everything else reads the sentinel.
+    """
+    smap = healsparse.HealSparseMap.make_empty(
+        NSIDE_COVERAGE, NSIDE_SPARSE, dtype, sentinel=sentinel
+    )
+    smap.update_values_pos(
+        RA[:3], DEC[:3], np.full(3, value, dtype=dtype), lonlat=True
+    )
+    return smap
+
+
+def _write_final_cat(path):
+    """Write a synthetic final_cat FITS with a RESULTS ext of known positions."""
+    data = np.empty(
+        len(RA),
+        dtype=[
+            ("NUMBER", "i4"),
+            ("XWIN_WORLD", "f8"),
+            ("YWIN_WORLD", "f8"),
+        ],
+    )
+    data["NUMBER"] = np.arange(len(RA))
+    data["XWIN_WORLD"] = RA
+    data["YWIN_WORLD"] = DEC
+
+    cat = file_io.FITSCatalogue(
+        str(path),
+        open_mode=file_io.BaseCatalogue.OpenMode.ReadWrite,
+    )
+    cat.save_as_fits(data, ext_name="RESULTS")
+    return cat
+
+
+def test_parse_mask_ext_paths():
+    """band:path pairs parse into a stripped mapping, whitespace-tolerant."""
+    parsed = make_cat.parse_mask_ext_paths(
+        "u:/a/mask_u.hsp, g:/b/mask_g.hsp,r:/c/mask_r.hsp"
+    )
+    assert parsed == {
+        "u": "/a/mask_u.hsp",
+        "g": "/b/mask_g.hsp",
+        "r": "/c/mask_r.hsp",
+    }
+
+
+def test_mask_ext_columns(tmp_path):
+    """Per-band columns carry the map value on-map and the sentinel off-map."""
+    u_map = _make_map(16)
+    g_map = _make_map(32)
+    u_path = tmp_path / "mask_u.hsp"
+    g_path = tmp_path / "mask_g.hsp"
+    u_map.write(str(u_path))
+    g_map.write(str(g_path))
+
+    cat_path = tmp_path / "final_cat-000.fits"
+    _write_final_cat(cat_path)
+
+    cat = file_io.FITSCatalogue(
+        str(cat_path),
+        open_mode=file_io.BaseCatalogue.OpenMode.ReadWrite,
+    )
+    make_cat.save_mask_ext_data(
+        cat,
+        {"u": str(u_path), "g": str(g_path)},
+        _NullLogger(),
+    )
+
+    cat.open()
+    data = cat.get_data()
+    # On-map objects (first three) carry the map value; the off-map object
+    # (last) carries the map's -1 sentinel.
+    npt.assert_array_equal(data["MASK_u"], [16, 16, 16, -1])
+    npt.assert_array_equal(data["MASK_g"], [32, 32, 32, -1])
+    # Integer dtype preserved from the map.
+    assert np.issubdtype(data["MASK_u"].dtype, np.integer)
+    cat.close()
+
+
+def test_mask_ext_absent_is_noop(tmp_path):
+    """Not calling the lookup leaves the catalogue columns unchanged."""
+    cat_path = tmp_path / "final_cat-001.fits"
+    _write_final_cat(cat_path)
+
+    cat = file_io.FITSCatalogue(str(cat_path))
+    cat.open()
+    cols = set(cat.get_data().dtype.names)
+    cat.close()
+
+    assert cols == {"NUMBER", "XWIN_WORLD", "YWIN_WORLD"}
+    assert not any(name.startswith("MASK_") for name in cols)

From 6f2f708b56537ccb402b92c883a17c2cac56eac1 Mon Sep 17 00:00:00 2001
From: Cail Daley <cail.daley@cea.fr>
Date: Thu, 16 Jul 2026 18:32:24 +0200
Subject: [PATCH 4/4] feat(mask_ext): fail fast on boolean masks with non-1
 bits

The real 2025 r-band UNIONS mask (mask_r_nside131072.hsp) is a boolean
healsparse map (True = masked), not an integer bit-flag map. With a
boolean map, any BIT_FLAG_MAP bit other than 1 silently selects nothing
(True & 64 == 0), producing an all-clean flag image. Raise instead, and
document the two mask flavours in the example configs.

Found by the real-data smoke: rasterizing the candide mask copy onto
the CFIS.233.293 tile grid.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013btLTHCgmiiggZmxJ4hM3n
---
 example/cfis/config_exp_MaExt.ini             |  4 +-
 example/cfis/config_tile_MaExt.ini            |  4 +-
 .../modules/mask_ext_package/mask_ext.py      | 14 ++++++
 tests/module/test_mask_ext.py                 | 44 +++++++++++++++++++
 4 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/example/cfis/config_exp_MaExt.ini b/example/cfis/config_exp_MaExt.ini
index ecd416e1..ccb527dd 100644
--- a/example/cfis/config_exp_MaExt.ini
+++ b/example/cfis/config_exp_MaExt.ini
@@ -34,7 +34,9 @@ NUMBERING_SCHEME = -0000000-0
 # Path of the external healsparse mask file (band-agnostic; r-band for shear)
 MASK_PATH = $SP_CONFIG/mask_r.hsp
 
-# Healsparse bit value -> output flag value mapping
+# Healsparse bit value -> output flag value mapping.
+# Integer bit-flag masks use per-band bits (e.g. 64 = r); boolean masks
+# (True = masked, e.g. mask_r_nside131072.hsp) use 1:<flag>.
 BIT_FLAG_MAP = 64:1
 
 # Flag value for pixels outside the healsparse footprint (0 = unflagged)
diff --git a/example/cfis/config_tile_MaExt.ini b/example/cfis/config_tile_MaExt.ini
index 410a6890..fce00da1 100644
--- a/example/cfis/config_tile_MaExt.ini
+++ b/example/cfis/config_tile_MaExt.ini
@@ -38,7 +38,9 @@ FILE_EXT = .fits
 # Path of the external healsparse mask file (band-agnostic; r-band for shear)
 MASK_PATH = $SP_CONFIG/mask_r.hsp
 
-# Healsparse bit value -> output flag value mapping
+# Healsparse bit value -> output flag value mapping.
+# Integer bit-flag masks use per-band bits (e.g. 64 = r); boolean masks
+# (True = masked, e.g. mask_r_nside131072.hsp) use 1:<flag>.
 BIT_FLAG_MAP = 64:1
 
 # Flag value for pixels outside the healsparse footprint (0 = unflagged)
diff --git a/src/shapepipe/modules/mask_ext_package/mask_ext.py b/src/shapepipe/modules/mask_ext_package/mask_ext.py
index 4edc2a12..c24aaabc 100644
--- a/src/shapepipe/modules/mask_ext_package/mask_ext.py
+++ b/src/shapepipe/modules/mask_ext_package/mask_ext.py
@@ -213,6 +213,20 @@ def rasterize(self):
         hmap = healsparse.HealSparseMap.read(self._mask_path)
         sentinel = hmap.sentinel
 
+        # Mask products come in two flavours: integer bit-flag maps (per-band
+        # bits, e.g. 64 = r) and boolean maps (True = masked, e.g. the
+        # candide copy of the 2025 r-band mask). For a boolean map the only
+        # meaningful bit is 1 (True); any other bit silently selects nothing
+        # (``True & 64 == 0`` -> an all-clean flag image), so fail loudly.
+        if hmap.dtype == np.bool_:
+            bad_bits = [bit for bit in self._bit_flag_map if bit != 1]
+            if bad_bits:
+                raise ValueError(
+                    f"Mask {self._mask_path} is a boolean healsparse map; "
+                    + f"BIT_FLAG_MAP bits {bad_bits} would never match "
+                    + "(use '1:<flag>' for boolean masks)"
+                )
+
         n_y, n_x = self._img_shape
         chunk_size = self._chunk_size or self._default_chunk_size()
 
diff --git a/tests/module/test_mask_ext.py b/tests/module/test_mask_ext.py
index f1843f2c..6958c9e0 100644
--- a/tests/module/test_mask_ext.py
+++ b/tests/module/test_mask_ext.py
@@ -228,3 +228,47 @@ def test_write_wcs_roundtrip(tmp_path):
     ra_in, dec_in = w.all_pix2world(cx, cy, 0)
     ra_out, dec_out = w_out.all_pix2world(cx, cy, 0)
     npt.assert_allclose([ra_in, dec_in], [ra_out, dec_out], rtol=0, atol=1e-9)
+
+
+def _make_bool_map(masked_ra, masked_dec):
+    """Healsparse boolean map (True = masked) at the given (ra, dec) cells."""
+    hmap = healsparse.HealSparseMap.make_empty(
+        NSIDE_COVERAGE, NSIDE_SPARSE, dtype=np.bool_, sentinel=False
+    )
+    pix = np.unique(hpgeom.angle_to_pixel(NSIDE_SPARSE, masked_ra, masked_dec))
+    hmap[pix] = np.ones(len(pix), dtype=np.bool_)
+    return hmap
+
+
+def test_bool_map_flag_1(tmp_path):
+    """A boolean mask (True = masked) rasterizes through BIT_FLAG_MAP 1:1.
+
+    This is the flavour of the real 2025 r-band UNIONS mask
+    (``mask_r_nside131072.hsp``): dtype bool, sentinel False, valid pixels
+    only where masked.
+    """
+    naxis1 = naxis2 = 16
+    w = _make_wcs(naxis1, naxis2)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    hmap = _make_bool_map([float(ra_c)], [float(dec_c)])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {1: 1})
+    flags = inst.rasterize()
+
+    assert flags.dtype == np.int16
+    assert np.sum(flags == 1) >= 1
+    assert np.all(np.isin(np.unique(flags), [0, 1]))
+
+
+def test_bool_map_wrong_bits_raise(tmp_path):
+    """Boolean mask + bits other than 1 would silently select nothing: raise."""
+    naxis1 = naxis2 = 8
+    w = _make_wcs(naxis1, naxis2)
+    cx, cy = naxis1 // 2, naxis2 // 2
+    ra_c, dec_c = w.all_pix2world(cx, cy, 0)
+    hmap = _make_bool_map([float(ra_c)], [float(dec_c)])
+
+    inst = _run(tmp_path, w, naxis1, naxis2, hmap, {64: 1})
+    with pytest.raises(ValueError, match="boolean healsparse map"):
+        inst.rasterize()