From patchwork Tue Oct 26 09:55:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Michel Hautbois X-Patchwork-Id: 14321 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 1141CBDB1C for ; Tue, 26 Oct 2021 09:55:59 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 9EB7B64895; Tue, 26 Oct 2021 11:55:58 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="MpKP3Pli"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 8197F6487E for ; Tue, 26 Oct 2021 11:55:46 +0200 (CEST) Received: from tatooine.ideasonboard.com (unknown [IPv6:2a01:e0a:169:7140:dce3:eb54:18d7:6f3d]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 3374AE79; Tue, 26 Oct 2021 11:55:46 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1635242146; bh=7BGr7hiTSDbpG7tzJHV7R/26QoDeqAxF3NbLgzjonZY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MpKP3PliVsikYi47Uuwbwb6pYjvKk2hPDyau/FRXUvy5WMkwgVOBi/zzupUSuyeRJ UzQ/nqFlBtR8SgpV1LjaLTBe4mM5/HqbLSi5JRQtajRuzsq7E+4jCHfS9EhJYMwTwN u+VsMqUQ5ur4dwBxwWrrsQCmRvAnwcw8R/RMoYUc= From: Jean-Michel Hautbois To: libcamera-devel@lists.libcamera.org Date: Tue, 26 Oct 2021 11:55:25 +0200 Message-Id: <20211026095534.90348-11-jeanmichel.hautbois@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211026095534.90348-1-jeanmichel.hautbois@ideasonboard.com> References: <20211026095534.90348-1-jeanmichel.hautbois@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH v4 10/19] ipa: ipu3: tonemapping: Add the documentation for ToneMapping X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" The tone mapping algorithm is currently undocumented. Provide an introduction and overview to the implementation as the class definition and document how the algorithm operates in the process and prepare methods. Signed-off-by: Jean-Michel Hautbois Signed-off-by: Kieran Bingham Reviewed-by: Laurent Pinchart Reviewed-by: Kieran Bingham --- v3: - rename gamma control as tone mapping --- src/ipa/ipu3/algorithms/tone_mapping.cpp | 30 +++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/src/ipa/ipu3/algorithms/tone_mapping.cpp b/src/ipa/ipu3/algorithms/tone_mapping.cpp index fcd22d0b..2040eda5 100644 --- a/src/ipa/ipu3/algorithms/tone_mapping.cpp +++ b/src/ipa/ipu3/algorithms/tone_mapping.cpp @@ -10,10 +10,22 @@ #include #include +/** + * \file tone_mapping.h + */ + namespace libcamera { namespace ipa::ipu3::algorithms { +/** + * \class ToneMapping + * \brief A class to handle tone mapping based on gamma + * + * This algorithm improves the image dynamic using a look-up table which is + * generated based on a gamma parameter. + */ + ToneMapping::ToneMapping() : gamma_(1.0) { @@ -35,6 +47,14 @@ int ToneMapping::configure(IPAContext &context, return 0; } +/** + * \brief Fill in the parameter structure, and enable gamma control + * \param context The shared IPA context + * \param params The IPU3 parameters + * + * Populate the IPU3 parameter structure with our tone mapping look up table and + * enable the gamma control module in the processing blocks. + */ void ToneMapping::prepare([[maybe_unused]] IPAContext &context, ipu3_uapi_params *params) { @@ -49,7 +69,15 @@ void ToneMapping::prepare([[maybe_unused]] IPAContext &context, params->acc_param.gamma.gc_ctrl.enable = 1; } -void ToneMapping::process([[maybe_unused]] IPAContext &context, +/** + * \brief Calculate the tone mapping look up table + * \param context The shared IPA context + * \param stats The IPU3 statistics and ISP results + * + * The tone mapping look up table is generated as an inverse power curve from + * our gamma setting. + */ +void ToneMapping::process(IPAContext &context, [[maybe_unused]] const ipu3_uapi_stats_3a *stats) { /*