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{ "id": 24443, "url": "https://patchwork.libcamera.org/api/1.1/patches/24443/?format=api", "web_url": "https://patchwork.libcamera.org/patch/24443/", "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": "<20250923190657.21453-5-hansg@kernel.org>", "date": "2025-09-23T19:06:56", "name": "[4/5] ipa: software_isp: AGC: Only use integers for exposure calculations", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "e1138d703b3e4bcc9cf6a9439c0b6dc6c4a80cea", "submitter": { "id": 239, "url": "https://patchwork.libcamera.org/api/1.1/people/239/?format=api", "name": "Hans de Goede", "email": "hansg@kernel.org" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/24443/mbox/", "series": [ { "id": 5455, "url": "https://patchwork.libcamera.org/api/1.1/series/5455/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5455", "date": "2025-09-23T19:06:52", "name": "ipa: software_isp: AGC: Fox AGC oscillation bug", "version": 1, "mbox": "https://patchwork.libcamera.org/series/5455/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/24443/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/24443/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 DE000C3332\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 23 Sep 2025 19:07:17 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 39BB56B611;\n\tTue, 23 Sep 2025 21:07:17 +0200 (CEST)", "from tor.source.kernel.org (tor.source.kernel.org\n\t[IPv6:2600:3c04:e001:324:0:1991:8:25])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 0E80B6B5FE\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 23 Sep 2025 21:07:07 +0200 (CEST)", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby tor.source.kernel.org (Postfix) with ESMTP id 3CD416027D\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 23 Sep 2025 19:07:06 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id 198CEC113D0;\n\tTue, 23 Sep 2025 19:07:04 +0000 (UTC)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (2048-bit key;\n\tunprotected) header.d=kernel.org header.i=@kernel.org\n\theader.b=\"SIft1GSQ\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1758654425;\n\tbh=Vx/0xvt89XCCFLMy+c+hKznTAYPnX+/TgEK9P5I19Go=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=SIft1GSQMVoxaxoPjxT0URWNwUq1trgMiQObknjqkRl1mp/8Ae/Z29qXEGp6LVHIa\n\t1kil9OT6B026XSqRMLQu1wooxyvGufkn56i2R2+o8+JhMRVobpmJhGPQH99tbYKHOO\n\t+goOwdM3rvco8DlyMm/95+Br67HkQjXP/W6HLTbWt24uUpAM6zU8TxPgvc0iNRkg0m\n\tYnLhkW2hEbHF+Pxviw7P/xjopfHvMB7qR6QhYAU+Yj+6EzJAIKzgt+nvcz86ILDKl4\n\tOCOG0fUvvxYth1VHGiwneLyGmV5tvmYspz1mmU/SoTcsd63t0Ig03JGdU2sGoPyQ7N\n\tBMMZx7nHw2NUg==", "From": "Hans de Goede <hansg@kernel.org>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Hans de Goede <hansg@kernel.org>", "Subject": "[PATCH 4/5] ipa: software_isp: AGC: Only use integers for exposure\n\tcalculations", "Date": "Tue, 23 Sep 2025 21:06:56 +0200", "Message-ID": "<20250923190657.21453-5-hansg@kernel.org>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20250923190657.21453-1-hansg@kernel.org>", "References": "<20250923190657.21453-1-hansg@kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "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": "Exposure is an integer, instead of re-using the \"double next\" used\nfor again calculations, doing intermediate calculations with double\nprecision, use a local next variable of an integer type.\n\nSigned-off-by: Hans de Goede <hansg@kernel.org>\n---\n src/ipa/simple/algorithms/agc.cpp | 9 ++++-----\n 1 file changed, 4 insertions(+), 5 deletions(-)", "diff": "diff --git a/src/ipa/simple/algorithms/agc.cpp b/src/ipa/simple/algorithms/agc.cpp\nindex 230616e62..cdde56ba2 100644\n--- a/src/ipa/simple/algorithms/agc.cpp\n+++ b/src/ipa/simple/algorithms/agc.cpp\n@@ -51,19 +51,18 @@ void Agc::updateExposure(IPAContext &context, IPAFrameContext &frameContext, dou\n \tstatic constexpr uint8_t kExpNumeratorUp = kExpDenominator + 1;\n \tstatic constexpr uint8_t kExpNumeratorDown = kExpDenominator - 1;\n \n-\tdouble next;\n \tint32_t &exposure = frameContext.sensor.exposure;\n \tdouble &again = frameContext.sensor.gain;\n \n \tif (exposureMSV < kExposureOptimal - kExposureSatisfactory) {\n \t\tif (exposure < context.configuration.agc.exposureMax) {\n-\t\t\tnext = exposure * kExpNumeratorUp / kExpDenominator;\n+\t\t\tint32_t next = exposure * kExpNumeratorUp / kExpDenominator;\n \t\t\tif (next - exposure < 1)\n \t\t\t\texposure += 1;\n \t\t\telse\n \t\t\t\texposure = next;\n \t\t} else {\n-\t\t\tnext = again * kExpNumeratorUp / kExpDenominator;\n+\t\t\tdouble next = again * kExpNumeratorUp / kExpDenominator;\n \t\t\tif (next - again < context.configuration.agc.againMinStep)\n \t\t\t\tagain += context.configuration.agc.againMinStep;\n \t\t\telse\n@@ -73,13 +72,13 @@ void Agc::updateExposure(IPAContext &context, IPAFrameContext &frameContext, dou\n \n \tif (exposureMSV > kExposureOptimal + kExposureSatisfactory) {\n \t\tif (again > context.configuration.agc.againDef) {\n-\t\t\tnext = again * kExpNumeratorDown / kExpDenominator;\n+\t\t\tdouble next = again * kExpNumeratorDown / kExpDenominator;\n \t\t\tif (again - next < context.configuration.agc.againMinStep)\n \t\t\t\tagain -= context.configuration.agc.againMinStep;\n \t\t\telse\n \t\t\t\tagain = next;\n \t\t} else {\n-\t\t\tnext = exposure * kExpNumeratorDown / kExpDenominator;\n+\t\t\tint32_t next = exposure * kExpNumeratorDown / kExpDenominator;\n \t\t\tif (exposure - next < 1)\n \t\t\t\texposure -= 1;\n \t\t\telse\n", "prefixes": [ "4/5" ] }