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{ "id": 26143, "url": "https://patchwork.libcamera.org/api/1.1/patches/26143/?format=api", "web_url": "https://patchwork.libcamera.org/patch/26143/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/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": "<20260213-kbingham-quantizers-v7-1-1626b9aaabf1@ideasonboard.com>", "date": "2026-02-13T16:57:40", "name": "[v7,01/15] ipa: libipa: Provide a Quantized data type support", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "a2c058aa9688a2e78ea46706248991b2c3cb8ad3", "submitter": { "id": 4, "url": "https://patchwork.libcamera.org/api/1.1/people/4/?format=api", "name": "Kieran Bingham", "email": "kieran.bingham@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/26143/mbox/", "series": [ { "id": 5789, "url": "https://patchwork.libcamera.org/api/1.1/series/5789/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5789", "date": "2026-02-13T16:57:39", "name": "libipa: Introduce a Quantized type", "version": 7, "mbox": "https://patchwork.libcamera.org/series/5789/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/26143/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/26143/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 9E20CC3292\n\tfor <parsemail@patchwork.libcamera.org>;\n\tFri, 13 Feb 2026 16:58:12 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0EE3B621EE;\n\tFri, 13 Feb 2026 17:58:07 +0100 (CET)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 7F15E621AA\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tFri, 13 Feb 2026 17:58:04 +0100 (CET)", "from ping.linuxembedded.co.uk\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 349F9CF5;\n\tFri, 13 Feb 2026 17:57:15 +0100 (CET)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"lO7DMeSA\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1771001835;\n\tbh=v7bU412OPfm2CsIYWch4XVDpV+86y0r+G0SfF1p6iWU=;\n\th=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n\tb=lO7DMeSAeWFKUfRQVyFqPwpbsQ6tOYWrZNgaoU1gnYNaKX84BBretfOJtBBo2bFbC\n\tw1Upv8N2a271HhkerZSjwyLdvF2oBO7fzp10CqNsPFe1lxkVrqplOd/QH1lA380y8c\n\tk8ifwfozbtdMrmRVyYO1LETBdxbB5V2L/GC9kbCA=", "From": "Kieran Bingham <kieran.bingham@ideasonboard.com>", "Date": "Fri, 13 Feb 2026 16:57:40 +0000", "Subject": "[PATCH v7 01/15] ipa: libipa: Provide a Quantized data type support", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "8bit", "Message-Id": "<20260213-kbingham-quantizers-v7-1-1626b9aaabf1@ideasonboard.com>", "References": "<20260213-kbingham-quantizers-v7-0-1626b9aaabf1@ideasonboard.com>", "In-Reply-To": "<20260213-kbingham-quantizers-v7-0-1626b9aaabf1@ideasonboard.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Kieran Bingham <kieran.bingham@ideasonboard.com>, =?utf-8?q?Barnab?=\n\t=?utf-8?b?w6FzIFDFkWN6ZQ==?= <barnabas.pocze@ideasonboard.com>,\n\tIsaac Scott <isaac.scott@ideasonboard.com>", "X-Mailer": "b4 0.14.3", "X-Developer-Signature": "v=1; a=ed25519-sha256; t=1771001883; l=8698;\n\ti=kieran.bingham@ideasonboard.com; s=20260207;\n\th=from:subject:message-id; \n\tbh=v7bU412OPfm2CsIYWch4XVDpV+86y0r+G0SfF1p6iWU=;\n\tb=9sNY2mOEXDa8pYDn40f2G7z+jn6jj2uSIQ0NaOZZl3GRjanrJwlskKi08ualJRHyx/+UFe8TD\n\t2BVD+JZEvLoCndwhDF2XyLsrDw80R3E16sdyp9/Q1evCHwO4OLFPtVq", "X-Developer-Key": "i=kieran.bingham@ideasonboard.com; a=ed25519;\n\tpk=FVXKN7YuwHc6UtbRUeTMAmranfsQomA+vnilfglWdaY=", "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>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "Frequently when handling data in IPA components we must convert and\nstore user interface values which may be floating point values, and\nperform a specific operation or conversion to quantize this to a\nhardware value.\n\nThis value may be to a fixed point type, or more custom code mappings,\nbut in either case it is important to contain both the required hardware\nvalue, with its effective quantized value.\n\nProvide a new storage type 'Quantized' which can be defined based on a\nset of type specific Traits to perform the conversions between floats\nand the underlying hardware type.\n\nReviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>\nReviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\n\n---\nv3:\n - adapt string format to [0xff:1.99] style instead of Q:0xff V:1.99\n - Clean up comments and copyright\n - Remove private initialisers - already handled by constructors\n - Change quantized_type to QuantizedType\n\nv5:\n- introduce operator<<(std::ostream &out, const Quantized<Traits> &q)\n- Remove unused iomanip and stdint.h from includes\n---\n src/ipa/libipa/meson.build | 2 +\n src/ipa/libipa/quantized.cpp | 135 +++++++++++++++++++++++++++++++++++++++++++\n src/ipa/libipa/quantized.h | 75 ++++++++++++++++++++++++\n 3 files changed, 212 insertions(+)", "diff": "diff --git a/src/ipa/libipa/meson.build b/src/ipa/libipa/meson.build\nindex 7202df869c2f..963c5ee73063 100644\n--- a/src/ipa/libipa/meson.build\n+++ b/src/ipa/libipa/meson.build\n@@ -17,6 +17,7 @@ libipa_headers = files([\n 'lux.h',\n 'module.h',\n 'pwl.h',\n+ 'quantized.h',\n 'v4l2_params.h',\n ])\n \n@@ -37,6 +38,7 @@ libipa_sources = files([\n 'lux.cpp',\n 'module.cpp',\n 'pwl.cpp',\n+ 'quantized.cpp',\n 'v4l2_params.cpp',\n ])\n \ndiff --git a/src/ipa/libipa/quantized.cpp b/src/ipa/libipa/quantized.cpp\nnew file mode 100644\nindex 000000000000..06143a97ab3e\n--- /dev/null\n+++ b/src/ipa/libipa/quantized.cpp\n@@ -0,0 +1,135 @@\n+/* SPDX-License-Identifier: LGPL-2.1-or-later */\n+/*\n+ * Copyright (C) 2025, Ideas On Board Oy\n+ *\n+ * Helper class to manage conversions between floating point types and quantized\n+ * storage and representation of those values.\n+ */\n+\n+#include \"quantized.h\"\n+\n+/**\n+ * \\file quantized.h\n+ * \\brief Quantized storage and Quantizer representations\n+ */\n+\n+namespace libcamera {\n+\n+namespace ipa {\n+\n+/**\n+ * \\struct libcamera::ipa::Quantized\n+ * \\brief Wrapper that stores a value in both quantized and floating-point form\n+ * \\tparam Traits The traits class defining the quantization behaviour\n+ *\n+ * The Quantized struct template provides a thin wrapper around a quantized\n+ * representation of a floating-point value. It uses a traits type \\a Traits\n+ * to define the conversion policy between the floating-point domain and the\n+ * quantized integer domain.\n+ *\n+ * Each Quantized instance maintains two synchronized members:\n+ * - the quantized integer representation, and\n+ * - the corresponding floating-point value.\n+ *\n+ * The traits type defines:\n+ * - the integer storage type used for quantization,\n+ * - the static conversion functions \\c fromFloat() and \\c toFloat(), and\n+ * - optional metadata such as value ranges.\n+ *\n+ * Quantized provides convenient constructors and assignment operators from\n+ * either representation, as well as comparison and string formatting utilities.\n+ */\n+\n+/**\n+ * \\typedef Quantized::TraitsType\n+ * \\brief The traits policy type defining the quantization behaviour\n+ *\n+ * Exposes the associated traits type used by this Quantized instance.\n+ * This allows external code to refer to constants or metadata defined in\n+ * the traits, such as \\c TraitsType::min or \\c TraitsType::max.\n+ */\n+\n+/**\n+ * \\typedef Quantized::QuantizedType\n+ * \\brief The integer type used for the quantized representation\n+ *\n+ * This alias corresponds to \\c TraitsType::QuantizedType, as defined by\n+ * the traits class.\n+ */\n+\n+/**\n+ * \\fn Quantized::Quantized(float x)\n+ * \\brief Construct a Quantized value from a floating-point number\n+ * \\param[in] x The floating-point value to be quantized\n+ *\n+ * Converts the floating-point input \\a x to its quantized integer\n+ * representation using the associated traits policy, and initializes\n+ * both the quantized and floating-point members.\n+ */\n+\n+/**\n+ * \\fn Quantized::Quantized(QuantizedType x)\n+ * \\brief Construct a Quantized value from an existing quantized integer\n+ * \\param[in] x The quantized integer value\n+ *\n+ * Converts the quantized integer \\a x to its corresponding floating-point\n+ * value using the traits policy, and initializes both internal members.\n+ */\n+\n+/**\n+ * \\fn Quantized::operator=(float x)\n+ * \\brief Assign a floating-point value to the Quantized object\n+ * \\param[in] x The floating-point value to assign\n+ * \\return A reference to the updated Quantized object\n+ *\n+ * Converts the floating-point value \\a x to its quantized integer\n+ * representation using the traits policy and updates both members.\n+ */\n+\n+/**\n+ * \\fn Quantized::operator=(QuantizedType x)\n+ * \\brief Assign a quantized integer value to the Quantized object\n+ * \\param[in] x The quantized integer value to assign\n+ * \\return A reference to the updated Quantized object\n+ *\n+ * Converts the quantized integer \\a x to its corresponding floating-point\n+ * value using the traits policy and updates both members.\n+ */\n+\n+/**\n+ * \\fn Quantized::value() const noexcept\n+ * \\brief Retrieve the floating-point representation\n+ * \\return The floating-point value corresponding to the quantized value\n+ */\n+\n+/**\n+ * \\fn Quantized::quantized() const noexcept\n+ * \\brief Retrieve the quantized integer representation\n+ * \\return The quantized integer value\n+ */\n+\n+/**\n+ * \\fn Quantized::operator==(const Quantized &other) const noexcept\n+ * \\brief Compare two Quantized objects for equality\n+ * \\param[in] other The other Quantized object to compare against\n+ * \\return True if both objects have the same quantized integer value\n+ */\n+\n+/**\n+ * \\fn Quantized::operator!=(const Quantized &other) const noexcept\n+ * \\brief Compare two Quantized objects for inequality\n+ * \\param[in] other The other Quantized object to compare against\n+ * \\return True if the quantized integer values differ\n+ */\n+\n+/**\n+ * \\fn std::ostream &Quantized::operator<<(std::ostream &out, const Quantized<Traits> &q)\n+ * \\brief Insert a text representation of a Quantized into an output stream\n+ * \\param[in] out The output stream\n+ * \\param[in] q The Quantized\n+ * \\return The output stream \\a out\n+ */\n+\n+} /* namespace ipa */\n+\n+} /* namespace libcamera */\ndiff --git a/src/ipa/libipa/quantized.h b/src/ipa/libipa/quantized.h\nnew file mode 100644\nindex 000000000000..0b2f7148c821\n--- /dev/null\n+++ b/src/ipa/libipa/quantized.h\n@@ -0,0 +1,75 @@\n+/* SPDX-License-Identifier: LGPL-2.1-or-later */\n+/*\n+ * Copyright (C) 2025, Ideas On Board Oy\n+ *\n+ * Helper class to manage conversions between floating point types and quantized\n+ * storage and representation of those values.\n+ */\n+\n+#pragma once\n+\n+#include <sstream>\n+#include <type_traits>\n+\n+#include <libcamera/base/utils.h>\n+\n+namespace libcamera {\n+\n+namespace ipa {\n+\n+template<typename Traits>\n+struct Quantized {\n+\tusing TraitsType = Traits;\n+\tusing QuantizedType = typename Traits::QuantizedType;\n+\tstatic_assert(std::is_arithmetic_v<QuantizedType>,\n+\t\t \"Quantized: QuantizedType must be arithmetic\");\n+\n+\tQuantized()\n+\t\t: Quantized(0.0f) {}\n+\tQuantized(float x) { *this = x; }\n+\tQuantized(QuantizedType x) { *this = x; }\n+\n+\tQuantized &operator=(float x)\n+\t{\n+\t\tquantized_ = Traits::fromFloat(x);\n+\t\tvalue_ = Traits::toFloat(quantized_);\n+\t\treturn *this;\n+\t}\n+\n+\tQuantized &operator=(QuantizedType x)\n+\t{\n+\t\tvalue_ = Traits::toFloat(x);\n+\t\tquantized_ = x;\n+\t\treturn *this;\n+\t}\n+\n+\tfloat value() const noexcept { return value_; }\n+\tQuantizedType quantized() const noexcept { return quantized_; }\n+\n+\tbool operator==(const Quantized &other) const noexcept\n+\t{\n+\t\treturn quantized_ == other.quantized_;\n+\t}\n+\n+\tbool operator!=(const Quantized &other) const noexcept\n+\t{\n+\t\treturn !(*this == other);\n+\t}\n+\n+\tfriend std::ostream &operator<<(std::ostream &out,\n+\t\t\t\t\tconst Quantized<Traits> &q)\n+\t{\n+\t\tout << \"[\" << utils::hex(q.quantized())\n+\t\t << \":\" << q.value() << \"]\";\n+\n+\t\treturn out;\n+\t}\n+\n+private:\n+\tQuantizedType quantized_;\n+\tfloat value_;\n+};\n+\n+} /* namespace ipa */\n+\n+} /* namespace libcamera */\n", "prefixes": [ "v7", "01/15" ] }