[{"id":38437,"web_url":"https://patchwork.libcamera.org/comment/38437/","msgid":"","date":"2026-03-27T10:12:20","subject":"Re: [PATCH v2] ipa: rpi: Fix gamma lookup table generation for PiSP\n\tplatform","submitter":{"id":130,"url":"https://patchwork.libcamera.org/api/people/130/","name":"Nick Hollinghurst","email":"nick.hollinghurst@raspberrypi.com"},"content":"Hi David,\n\nLGTM\n\nReviewed-by: Nick Hollinghurst \n\n\nOn Fri, 27 Mar 2026 at 09:03, David Plowman\n wrote:\n>\n> generateLut was failing to fill in the final slope value, meaning that\n> fully saturated pixels would full slightly short (the slope of the\n> final piecewise linear segment would default to zero).\n>\n> The loop is slightly reorganised to fix the problem.\n>\n> Signed-off-by: David Plowman \n> ---\n> src/ipa/rpi/pisp/pisp.cpp | 42 +++++++++++++++++----------------------\n> 1 file changed, 18 insertions(+), 24 deletions(-)\n>\n> diff --git a/src/ipa/rpi/pisp/pisp.cpp b/src/ipa/rpi/pisp/pisp.cpp\n> index ec7593ff..2abb59fa 100644\n> --- a/src/ipa/rpi/pisp/pisp.cpp\n> +++ b/src/ipa/rpi/pisp/pisp.cpp\n> @@ -80,36 +80,30 @@ int generateLut(const ipa::Pwl &pwl, uint32_t *lut, std::size_t lutSize,\n> if (pwl.empty())\n> return -EINVAL;\n>\n> - int lastY = 0;\n> + int nextY = pwl.eval(0);\n> for (unsigned int i = 0; i < lutSize; i++) {\n> - int x, y;\n> - if (i < 32)\n> - x = i * 512;\n> - else if (i < 48)\n> - x = (i - 32) * 1024 + 16384;\n> + unsigned int nextI = i + 1;\n> +\n> + int nextX;\n> + if (nextI < 32)\n> + nextX = nextI * 512;\n> + else if (nextI < 48)\n> + nextX = (nextI - 32) * 1024 + 16384;\n> else\n> - x = std::min(65535u, (i - 48) * 2048 + 32768);\n> + nextX = (nextI - 48) * 2048 + 32768;\n>\n> - y = pwl.eval(x);\n> - if (y < 0 || (i && y < lastY)) {\n> - LOG(IPARPI, Error)\n> - << \"Malformed PWL for Gamma, disabling!\";\n> - return -1;\n> - }\n> + int y = nextY;\n> + nextY = pwl.eval(nextX);\n>\n> - if (i) {\n> - unsigned int slope = y - lastY;\n> - if (slope >= (1u << SlopeBits)) {\n> - slope = (1u << SlopeBits) - 1;\n> - LOG(IPARPI, Info)\n> - << (\"Maximum Gamma slope exceeded, adjusting!\");\n> - y = lastY + slope;\n> - }\n> - lut[i - 1] |= slope << PosBits;\n> + unsigned int slope = nextY - y;\n> + if (slope >= (1u << SlopeBits)) {\n> + slope = (1u << SlopeBits) - 1;\n> + LOG(IPARPI, Info)\n> + << \"Maximum Gamma slope exceeded, adjusting!\";\n> + nextY = y + slope;\n> }\n>\n> - lut[i] = y;\n> - lastY = y;\n> + lut[i] = y | (slope << PosBits);\n> }\n>\n> return 0;\n> --\n> 2.47.3\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 36D76BDCBD\n\tfor ;\n\tFri, 27 Mar 2026 10:12:34 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 5859E62C6C;\n\tFri, 27 Mar 2026 11:12:33 +0100 (CET)","from mail-ej1-x636.google.com (mail-ej1-x636.google.com\n\t[IPv6:2a00:1450:4864:20::636])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 7068F6271A\n\tfor ;\n\tFri, 27 Mar 2026 11:12:32 +0100 (CET)","by mail-ej1-x636.google.com with SMTP id\n\ta640c23a62f3a-b9382e59c0eso313955666b.0\n\tfor ;\n\tFri, 27 Mar 2026 03:12:32 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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charset=\"UTF-8\"","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\" "}},{"id":38479,"web_url":"https://patchwork.libcamera.org/comment/38479/","msgid":"","date":"2026-04-01T10:03:32","subject":"Re: [PATCH v2] ipa: rpi: Fix gamma lookup table generation for PiSP\n\tplatform","submitter":{"id":34,"url":"https://patchwork.libcamera.org/api/people/34/","name":"Naushir Patuck","email":"naush@raspberrypi.com"},"content":"Hi David,\n\nOn Fri, 27 Mar 2026 at 09:03, David Plowman\n wrote:\n>\n> generateLut was failing to fill in the final slope value, meaning that\n> fully saturated pixels would full slightly short (the slope of the\n> final piecewise linear segment would default to zero).\n>\n> The loop is slightly reorganised to fix the problem.\n>\n> Signed-off-by: David Plowman \n\nReviewed-by: Naushir Patuck \n\n> ---\n> src/ipa/rpi/pisp/pisp.cpp | 42 +++++++++++++++++----------------------\n> 1 file changed, 18 insertions(+), 24 deletions(-)\n>\n> diff --git a/src/ipa/rpi/pisp/pisp.cpp b/src/ipa/rpi/pisp/pisp.cpp\n> index ec7593ff..2abb59fa 100644\n> --- a/src/ipa/rpi/pisp/pisp.cpp\n> +++ b/src/ipa/rpi/pisp/pisp.cpp\n> @@ -80,36 +80,30 @@ int generateLut(const ipa::Pwl &pwl, uint32_t *lut, std::size_t lutSize,\n> if (pwl.empty())\n> return -EINVAL;\n>\n> - int lastY = 0;\n> + int nextY = pwl.eval(0);\n> for (unsigned int i = 0; i < lutSize; i++) {\n> - int x, y;\n> - if (i < 32)\n> - x = i * 512;\n> - else if (i < 48)\n> - x = (i - 32) * 1024 + 16384;\n> + unsigned int nextI = i + 1;\n> +\n> + int nextX;\n> + if (nextI < 32)\n> + nextX = nextI * 512;\n> + else if (nextI < 48)\n> + nextX = (nextI - 32) * 1024 + 16384;\n> else\n> - x = std::min(65535u, (i - 48) * 2048 + 32768);\n> + nextX = (nextI - 48) * 2048 + 32768;\n>\n> - y = pwl.eval(x);\n> - if (y < 0 || (i && y < lastY)) {\n> - LOG(IPARPI, Error)\n> - << \"Malformed PWL for Gamma, disabling!\";\n> - return -1;\n> - }\n> + int y = nextY;\n> + nextY = pwl.eval(nextX);\n>\n> - if (i) {\n> - unsigned int slope = y - lastY;\n> - if (slope >= (1u << SlopeBits)) {\n> - slope = (1u << SlopeBits) - 1;\n> - LOG(IPARPI, Info)\n> - << (\"Maximum Gamma slope exceeded, adjusting!\");\n> - y = lastY + slope;\n> - }\n> - lut[i - 1] |= slope << PosBits;\n> + unsigned int slope = nextY - y;\n> + if (slope >= (1u << SlopeBits)) {\n> + slope = (1u << SlopeBits) - 1;\n> + LOG(IPARPI, Info)\n> + << \"Maximum Gamma slope exceeded, adjusting!\";\n> + nextY = y + slope;\n> }\n>\n> - lut[i] = y;\n> - lastY = y;\n> + lut[i] = y | (slope << PosBits);\n> }\n>\n> return 0;\n> --\n> 2.47.3\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 78BB0BEFBE\n\tfor ;\n\tWed, 1 Apr 2026 10:04:13 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 7608A62D50;\n\tWed, 1 Apr 2026 12:04:12 +0200 (CEST)","from mail-vk1-xa2f.google.com (mail-vk1-xa2f.google.com\n\t[IPv6:2607:f8b0:4864:20::a2f])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 7539D62CF3\n\tfor ;\n\tWed, 1 Apr 2026 12:04:10 +0200 (CEST)","by mail-vk1-xa2f.google.com with SMTP id\n\t71dfb90a1353d-56cc9de9d1dso252510e0c.2\n\tfor ;\n\tWed, 01 Apr 2026 03:04:10 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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Wed, 01 Apr 2026\n\t03:04:09 -0700 (PDT)","MIME-Version":"1.0","References":"<20260327090323.2250-1-david.plowman@raspberrypi.com>","In-Reply-To":"<20260327090323.2250-1-david.plowman@raspberrypi.com>","From":"Naushir Patuck ","Date":"Wed, 1 Apr 2026 11:03:32 +0100","X-Gm-Features":"AQROBzAhrqzKEA1sGboUWUXaoPCn_5z1R5Li3o4qcv3I_R1q9QMAf2BAViu7BWQ","Message-ID":"","Subject":"Re: [PATCH v2] ipa: rpi: Fix gamma lookup table generation for PiSP\n\tplatform","To":"David Plowman ","Cc":"libcamera-devel@lists.libcamera.org","Content-Type":"text/plain; charset=\"UTF-8\"","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\" "}}]