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{ "id": 25976, "url": "https://patchwork.libcamera.org/api/covers/25976/?format=api", "web_url": "https://patchwork.libcamera.org/cover/25976/", "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": "<20260127134313.80579-1-mzamazal@redhat.com>", "date": "2026-01-27T13:43:12", "name": "[RFC,v4,0/1] Reduce statistics image area in software ISP", "submitter": { "id": 177, "url": "https://patchwork.libcamera.org/api/people/177/?format=api", "name": "Milan Zamazal", "email": "mzamazal@redhat.com" }, "mbox": "https://patchwork.libcamera.org/cover/25976/mbox/", "series": [ { "id": 5743, "url": "https://patchwork.libcamera.org/api/series/5743/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5743", "date": "2026-01-27T13:43:12", "name": "Reduce statistics image area in software ISP", "version": 4, "mbox": "https://patchwork.libcamera.org/series/5743/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/covers/25976/comments/", "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 80CE5C3200\n\tfor <parsemail@patchwork.libcamera.org>;\n\tTue, 27 Jan 2026 13:43:23 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id E110F61FCA;\n\tTue, 27 Jan 2026 14:43:21 +0100 (CET)", "from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.133.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id A3F6D61FBF\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tTue, 27 Jan 2026 14:43:20 +0100 (CET)", "from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com\n\t(ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97])\n\tby relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3,\n\tcipher=TLS_AES_256_GCM_SHA384) id us-mta-170-oUmxprJQP1CuW83ualQ6mQ-1;\n\tTue, 27 Jan 2026 08:43:18 -0500", "from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com\n\t(mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\tkey-exchange X25519 server-signature RSA-PSS (2048 bits)\n\tserver-digest SHA256) (No client certificate requested)\n\tby mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix)\n\twith ESMTPS\n\tid 4E4DA1800447 for <libcamera-devel@lists.libcamera.org>;\n\tTue, 27 Jan 2026 13:43:17 +0000 (UTC)", "from mzamazal-thinkpadp1gen7.tpbc.com (unknown [10.44.34.174])\n\tby mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix)\n\twith ESMTP id 34FD230001A2; Tue, 27 Jan 2026 13:43:15 +0000 (UTC)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=redhat.com header.i=@redhat.com\n\theader.b=\"TlzAEeLE\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n\ts=mimecast20190719; t=1769521399;\n\th=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n\tto:to:cc:cc:mime-version:mime-version:content-type:content-type:\n\tcontent-transfer-encoding:content-transfer-encoding;\n\tbh=ginBRJAKPA3FxyPFMRgC+Ee4IHUjPghy3Fy3lvgsStc=;\n\tb=TlzAEeLEKBf+PkC7zxNaZbIDhUnTRwfY9lfitvcqfxBQ0bs9gHyUXbybRsirM9rlNeVioy\n\tP0kfucazJTZgbgDWcyA2jncVj8SP3IgFL8x8bx+ef1w7sNQh38vgLgYPyvK5v5T5PLH519\n\tiFTDD9dz2FQ2YYrqp/eI7O+/Aai/E7c=", "X-MC-Unique": "oUmxprJQP1CuW83ualQ6mQ-1", "X-Mimecast-MFC-AGG-ID": "oUmxprJQP1CuW83ualQ6mQ_1769521397", "From": "Milan Zamazal <mzamazal@redhat.com>", "To": "libcamera-devel@lists.libcamera.org", "Cc": "Milan Zamazal <mzamazal@redhat.com>", "Subject": "[RFC PATCH v4 0/1] Reduce statistics image area in software ISP", "Date": "Tue, 27 Jan 2026 14:43:12 +0100", "Message-ID": "<20260127134313.80579-1-mzamazal@redhat.com>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.4", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "7ng53BvgudIKi348bpqaeENJjLvPbNJnrk3HERC04PM_1769521397", "X-Mimecast-Originator": "redhat.com", "Content-Transfer-Encoding": "8bit", "content-type": "text/plain; charset=\"US-ASCII\"; x-default=true", "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": "This patch suggests reducing the image area used for gathering\nstatistics to the central 2/3 of the image width and height. It may or may not be a good idea.\n\nChanges in v4:\n- Rebased.\n- Comments in both the GPU and CPU ISPs simplified and unified.\n- The declared purpose shifted from speedup to using a more relevant\n area for gathering the statistics.\n- Changed to RFC due to the shifted purpose.\n\nChanges in v3:\n- Rectangle::croppedBy() dropped, already available methods used instead.\n- The cropping is applied also in CPU debayering for consistency.\n\nChanges in v2:\n- Safer implementation of Rectangle::croppedBy() as suggested by Kieran.\n- Test added for Rectangle::croppedBy().\n- The comment about not passing x,y clarified.\n\nMilan Zamazal (1):\n libcamera: software_isp: Reduce statistics image area\n\n src/libcamera/software_isp/debayer_cpu.cpp | 10 +++-------\n src/libcamera/software_isp/debayer_egl.cpp | 6 +++---\n 2 files changed, 6 insertions(+), 10 deletions(-)" }