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{
    "id": 17558,
    "url": "https://patchwork.libcamera.org/api/patches/17558/?format=api",
    "web_url": "https://patchwork.libcamera.org/patch/17558/",
    "project": {
        "id": 1,
        "url": "https://patchwork.libcamera.org/api/projects/1/?format=api",
        "name": "libcamera",
        "link_name": "libcamera",
        "list_id": "libcamera_core",
        "list_email": "libcamera-devel@lists.libcamera.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": ""
    },
    "msgid": "<20221006230747.11688-4-laurent.pinchart@ideasonboard.com>",
    "date": "2022-10-06T23:07:46",
    "name": "[libcamera-devel,v2,3/4] libcamera: controls: Construct Span with size for array controls",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "11e0453b569448e5bca434682d8098c5e3cb832a",
    "submitter": {
        "id": 2,
        "url": "https://patchwork.libcamera.org/api/people/2/?format=api",
        "name": "Laurent Pinchart",
        "email": "laurent.pinchart@ideasonboard.com"
    },
    "delegate": null,
    "mbox": "https://patchwork.libcamera.org/patch/17558/mbox/",
    "series": [
        {
            "id": 3541,
            "url": "https://patchwork.libcamera.org/api/series/3541/?format=api",
            "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=3541",
            "date": "2022-10-06T23:07:43",
            "name": "libcamera: Improve handling of fixed-size array controls",
            "version": 2,
            "mbox": "https://patchwork.libcamera.org/series/3541/mbox/"
        }
    ],
    "comments": "https://patchwork.libcamera.org/api/patches/17558/comments/",
    "check": "pending",
    "checks": "https://patchwork.libcamera.org/api/patches/17558/checks/",
    "tags": {},
    "headers": {
        "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>",
        "X-Original-To": "parsemail@patchwork.libcamera.org",
        "Delivered-To": "parsemail@patchwork.libcamera.org",
        "Received": [
            "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 72FD7BD16B\n\tfor <parsemail@patchwork.libcamera.org>;\n\tThu,  6 Oct 2022 23:08:01 +0000 (UTC)",
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        ],
        "DKIM-Signature": [
            "v=1; a=rsa-sha256; c=relaxed/simple; d=libcamera.org;\n\ts=mail; t=1665097681;\n\tbh=5RD1PXUGvhzpLRYGfkbmlyL16KVADQxTMpFINfHZAxg=;\n\th=To:Date:In-Reply-To:References:Subject:List-Id:List-Unsubscribe:\n\tList-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:\n\tFrom;\n\tb=1AAIcKCXjmFB+RcraLJ94GmG61nxMlZkfuA9hhwSLVaUuAyFlbzPXy2PKSp06j0kB\n\tllPcwJGPeiy6DWdbDviuR8o7orSyO0xI8RfpoxsV1izpWCbm1LXnNqiU+yLYMfWqFF\n\tq/YnkVWkWRJiRVPOKoaQIQVhwkuqADecZYl6c/CzaucOfIms8DFVxoZbxQ5iXLfmLo\n\tgUpoj+S+KAdVP8QWaIK/cycZTijVrKAMecyN3BFw/+A1IcapzKVdXmT3z0EyrjBS5+\n\tVen85p01WoLXKRGn5racEDeIVsXc2qeWfEPxXSFeNW0JgbXTLGZJGC6GjEzulWpD15\n\tAtsZlUfrtUCSA==",
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        ],
        "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"qaIHJQyI\"; dkim-atps=neutral",
        "To": "libcamera-devel@lists.libcamera.org",
        "Date": "Fri,  7 Oct 2022 02:07:46 +0300",
        "Message-Id": "<20221006230747.11688-4-laurent.pinchart@ideasonboard.com>",
        "X-Mailer": "git-send-email 2.35.1",
        "In-Reply-To": "<20221006230747.11688-1-laurent.pinchart@ideasonboard.com>",
        "References": "<20221006230747.11688-1-laurent.pinchart@ideasonboard.com>",
        "MIME-Version": "1.0",
        "Content-Transfer-Encoding": "8bit",
        "Subject": "[libcamera-devel] [PATCH v2 3/4] libcamera: controls: Construct\n\tSpan with size for array controls",
        "X-BeenThere": "libcamera-devel@lists.libcamera.org",
        "X-Mailman-Version": "2.1.29",
        "Precedence": "list",
        "List-Id": "<libcamera-devel.lists.libcamera.org>",
        "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>",
        "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>",
        "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>",
        "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>",
        "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>",
        "From": "Laurent Pinchart via libcamera-devel\n\t<libcamera-devel@lists.libcamera.org>",
        "Reply-To": "Laurent Pinchart <laurent.pinchart@ideasonboard.com>",
        "Errors-To": "libcamera-devel-bounces@lists.libcamera.org",
        "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>"
    },
    "content": "The ControlList::set() function overload used for array controls\nconstructs a Span from an initializer list. It doesn't specify the Span\nsize explicitly, which results in a dynamic extent Span being\nconstructed. That causes a compilation failure for fixed-size array\ncontrols, as they are defined as Control<T> with T being a fixed-extent\nSpan, and conversion from a dynamic-extent to fixed-extent Span when\ncalling ControlValue::set() can't be implicit.\n\nFix this by constructing the Span using the size of the control, which\nresolves to a fixed-extent and dynamic-extent Span for fixed-size and\ndynamic-size array controls respectively. The ControlList::set()\nfunction that takes an initializer list can then be used for fixed-size\narray controls.\n\nSigned-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\n---\n include/libcamera/controls.h | 6 +++---\n src/libcamera/controls.cpp   | 2 +-\n 2 files changed, 4 insertions(+), 4 deletions(-)",
    "diff": "diff --git a/include/libcamera/controls.h b/include/libcamera/controls.h\nindex 38d0a3e8360a..cf94205577a5 100644\n--- a/include/libcamera/controls.h\n+++ b/include/libcamera/controls.h\n@@ -393,14 +393,14 @@ public:\n \t\tval->set<T>(value);\n \t}\n \n-\ttemplate<typename T, typename V>\n-\tvoid set(const Control<T> &ctrl, const std::initializer_list<V> &value)\n+\ttemplate<typename T, typename V, size_t Size>\n+\tvoid set(const Control<Span<T, Size>> &ctrl, const std::initializer_list<V> &value)\n \t{\n \t\tControlValue *val = find(ctrl.id());\n \t\tif (!val)\n \t\t\treturn;\n \n-\t\tval->set<T>(Span<const typename std::remove_cv_t<V>>{ value.begin(), value.size() });\n+\t\tval->set(Span<const typename std::remove_cv_t<V>, Size>{ value.begin(), value.size() });\n \t}\n \n \tconst ControlValue &get(unsigned int id) const;\ndiff --git a/src/libcamera/controls.cpp b/src/libcamera/controls.cpp\nindex bc3db4f69388..6dbf9b348709 100644\n--- a/src/libcamera/controls.cpp\n+++ b/src/libcamera/controls.cpp\n@@ -970,7 +970,7 @@ bool ControlList::contains(unsigned int id) const\n  */\n \n /**\n- * \\fn ControlList::set(const Control<T> &ctrl, const std::initializer_list<V> &value)\n+ * \\fn ControlList::set(const Control<Span<T, Size>> &ctrl, const std::initializer_list<V> &value)\n  * \\copydoc ControlList::set(const Control<T> &ctrl, const V &value)\n  */\n \n",
    "prefixes": [
        "libcamera-devel",
        "v2",
        "3/4"
    ]
}