[{"id":33711,"web_url":"https://patchwork.libcamera.org/comment/33711/","msgid":"<174298546107.670680.9769840826469120155@ping.linuxembedded.co.uk>","date":"2025-03-26T10:37:41","subject":"Re: [PATCH v8 02/10] libcamera: software_isp: Use RGB type to\n\trepresent gains","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Milan Zamazal (2025-03-26 09:08:39)\n> Rather than using a custom struct to represent RGB values, let's use the\n> corresponding type and its facilities.\n> \n> Signed-off-by: Milan Zamazal \n> Reviewed-by: Laurent Pinchart \n\nReviewed-by: Kieran Bingham \n\n> Signed-off-by: Milan Zamazal \n> ---\n> src/ipa/simple/algorithms/awb.cpp | 16 +++++++++-------\n> src/ipa/simple/algorithms/lut.cpp | 14 ++++----------\n> src/ipa/simple/ipa_context.h | 8 +++-----\n> 3 files changed, 16 insertions(+), 22 deletions(-)\n> \n> diff --git a/src/ipa/simple/algorithms/awb.cpp b/src/ipa/simple/algorithms/awb.cpp\n> index 1efc7090..310be6a7 100644\n> --- a/src/ipa/simple/algorithms/awb.cpp\n> +++ b/src/ipa/simple/algorithms/awb.cpp\n> @@ -25,7 +25,7 @@ int Awb::configure(IPAContext &context,\n> [[maybe_unused]] const IPAConfigInfo &configInfo)\n> {\n> auto &gains = context.activeState.awb.gains;\n> - gains.red = gains.green = gains.blue = 1.0;\n> + gains = { { 1.0, 1.0, 1.0 } };\n> \n> return 0;\n> }\n> @@ -56,16 +56,18 @@ void Awb::process(IPAContext &context,\n> * Clamp max gain at 4.0, this also avoids 0 division.\n> */\n> auto &gains = context.activeState.awb.gains;\n> - gains.red = sumR <= sumG / 4 ? 4.0 : static_cast(sumG) / sumR;\n> - gains.blue = sumB <= sumG / 4 ? 4.0 : static_cast(sumG) / sumB;\n> - /* Green gain is fixed to 1.0 */\n> + gains = { {\n> + sumR <= sumG / 4 ? 4.0 : static_cast(sumG) / sumR,\n> + 1.0,\n> + sumB <= sumG / 4 ? 4.0 : static_cast(sumG) / sumB,\n> + } };\n> \n> - RGB rgbGains{ { 1 / gains.red, 1 / gains.green, 1 / gains.blue } };\n> + RGB rgbGains{ { 1 / gains.r(), 1 / gains.g(), 1 / gains.b() } };\n> context.activeState.awb.temperatureK = estimateCCT(rgbGains);\n> \n> LOG(IPASoftAwb, Debug)\n> - << \"gain R/B: \" << gains.red << \"/\" << gains.blue\n> - << \"; temperature: \" << context.activeState.awb.temperatureK;\n> + << \"gain R/B: \" << gains << \"; temperature: \"\n> + << context.activeState.awb.temperatureK;\n> }\n> \n> REGISTER_IPA_ALGORITHM(Awb, \"Awb\")\n> diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp\n> index a2e11d3b..83df71a9 100644\n> --- a/src/ipa/simple/algorithms/lut.cpp\n> +++ b/src/ipa/simple/algorithms/lut.cpp\n> @@ -103,16 +103,10 @@ void Lut::prepare(IPAContext &context,\n> const double div = static_cast(DebayerParams::kRGBLookupSize) /\n> gammaTableSize;\n> /* Apply gamma after gain! */\n> - unsigned int idx;\n> - idx = std::min({ static_cast(i * gains.red / div),\n> - gammaTableSize - 1 });\n> - params->red[i] = gammaTable[idx];\n> - idx = std::min({ static_cast(i * gains.green / div),\n> - gammaTableSize - 1 });\n> - params->green[i] = gammaTable[idx];\n> - idx = std::min({ static_cast(i * gains.blue / div),\n> - gammaTableSize - 1 });\n> - params->blue[i] = gammaTable[idx];\n> + const RGB lutGains = (gains * i / div).min(gammaTableSize - 1);\n> + params->red[i] = gammaTable[static_cast(lutGains.r())];\n> + params->green[i] = gammaTable[static_cast(lutGains.g())];\n> + params->blue[i] = gammaTable[static_cast(lutGains.b())];\n> }\n> }\n> \n> diff --git a/src/ipa/simple/ipa_context.h b/src/ipa/simple/ipa_context.h\n> index 607af45a..6a285414 100644\n> --- a/src/ipa/simple/ipa_context.h\n> +++ b/src/ipa/simple/ipa_context.h\n> @@ -13,6 +13,8 @@\n> \n> #include \n> \n> +#include \"libcamera/internal/vector.h\"\n> +\n> #include \n> \n> namespace libcamera {\n> @@ -36,11 +38,7 @@ struct IPAActiveState {\n> } blc;\n> \n> struct {\n> - struct {\n> - double red;\n> - double green;\n> - double blue;\n> - } gains;\n> + RGB gains;\n> unsigned int temperatureK;\n> } awb;\n> \n> -- \n> 2.49.0\n>","headers":{"Return-Path":"","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 AC3E2C3213\n\tfor ;\n\tWed, 26 Mar 2025 10:37:45 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id D524C68955;\n\tWed, 26 Mar 2025 11:37:44 +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 84B1368947\n\tfor ;\n\tWed, 26 Mar 2025 11:37:43 +0100 (CET)","from pendragon.ideasonboard.com\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 8D866475;\n\tWed, 26 Mar 2025 11:35:55 +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=\"Pq8nzC79\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1742985355;\n\tbh=iluhNS32Gzy/vYRdq/DS7D9IZeA622QL7UIsIDTPTS0=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=Pq8nzC79W7uRzZrlipZvcmIdIa2TBdwj84YIY0oQL/Ltft9j1We/ZTkImrn8dIyK1\n\tNTWRx4JwhFl9FxvRdxi6QOW6M/QMDBu2gipOxre4GBgsFf8yQjfA3xjWEPbt1tdQRn\n\t+6qPvegJfcnX9U3xQH0jM+y3t5ugo2UYOn8ziIwg=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20250326090849.15494-3-mzamazal@redhat.com>","References":"<20250326090849.15494-1-mzamazal@redhat.com>\n\t<20250326090849.15494-3-mzamazal@redhat.com>","Subject":"Re: [PATCH v8 02/10] libcamera: software_isp: Use RGB type to\n\trepresent gains","From":"Kieran Bingham ","Cc":"Milan Zamazal ,\n\tRobert Mader ,\n\tHans de Goede , \n\tLaurent Pinchart ","To":"Milan Zamazal , libcamera-devel@lists.libcamera.org","Date":"Wed, 26 Mar 2025 10:37:41 +0000","Message-ID":"<174298546107.670680.9769840826469120155@ping.linuxembedded.co.uk>","User-Agent":"alot/0.10","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}}]