From e0b7d30fd437292c88141fb08d60681870b86c6e Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Date: Fri, 8 May 2026 17:22:58 +0300
Subject: Squashed 'subprojects/pixpat/' content from commit d444626

git-subtree-dir: subprojects/pixpat
git-subtree-split: d444626e6ba988ec6d487800721e447f94b1eaf5
---
 pixpat-native/src/io/gray_packed.h | 78 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 pixpat-native/src/io/gray_packed.h

(limited to 'pixpat-native/src/io/gray_packed.h')

diff --git a/pixpat-native/src/io/gray_packed.h b/pixpat-native/src/io/gray_packed.h
new file mode 100644
index 0000000..dc1fa68
--- /dev/null
+++ b/pixpat-native/src/io/gray_packed.h
@@ -0,0 +1,78 @@
+#pragma once
+
+// MIPI CSI-2 packed grayscale (Y10P / Y12P). Same byte packing as
+// Bayer10P/Bayer12P (see io/csi2.h) but every sample is Y; the source
+// emits neutral chroma to keep cross-color-kind ColorXfm consistent
+// with GraySource.
+//
+// The Layout slot is a placeholder (matches the unpacked Y8 storage
+// shape so dispatch plumbing is uniform); bytes_per_pixel from the
+// Plane is unused.
+
+#include <array>
+#include <cstdint>
+
+#include "../layout.h"
+#include "csi2.h"
+
+namespace pixpat
+{
+
+template <typename L, size_t BitDepth>
+struct GrayPackedSource {
+	using Layout = L;
+	using Pixel  = YUV16;
+
+	static_assert(L::kind == ColorKind::YUV);
+	static_assert(L::num_planes == 1);
+	static_assert(BitDepth == 10 || BitDepth == 12);
+
+	using Traits = detail::csi2::packed_traits<BitDepth>;
+	static constexpr size_t ppg = Traits::ppg;
+	static constexpr size_t bpg = Traits::bpg;
+	static constexpr unsigned shift = 16 - BitDepth;
+
+	static YUV16 read(const Buffer<1>& buf, size_t x, size_t y,
+	                  [[maybe_unused]] size_t W,
+	                  [[maybe_unused]] size_t H) noexcept
+	{
+		const uint8_t* src = buf.data[0] + y * buf.stride[0]
+		                     + (x / ppg) * bpg;
+		const uint16_t val = detail::csi2::unpack_sample<BitDepth>(src, x % ppg);
+		return YUV16{
+		        uint16_t(val << shift),
+		        0x8000, 0x8000, uint16_t(0),
+		};
+	}
+};
+
+template <typename L, size_t BitDepth>
+struct GrayPackedSink {
+	using Layout = L;
+	using Pixel  = YUV16;
+
+	static_assert(L::kind == ColorKind::YUV);
+	static_assert(L::num_planes == 1);
+	static_assert(BitDepth == 10 || BitDepth == 12);
+
+	using Traits = detail::csi2::packed_traits<BitDepth>;
+	static constexpr size_t ppg = Traits::ppg;
+	static constexpr size_t bpg = Traits::bpg;
+
+	static constexpr size_t block_h = 1;
+	static constexpr size_t block_w = ppg;
+
+	static void write_block(Buffer<1>& buf, size_t bx, size_t by,
+	                        const YUV16 (&block)[1][ppg]) noexcept
+	{
+		std::array<uint16_t, ppg> vals{};
+		for (size_t i = 0; i < ppg; ++i)
+			vals[i] = uint16_t(block[0][i].y >> (16 - BitDepth));
+
+		uint8_t* dst = buf.data[0] + by * buf.stride[0]
+		               + (bx / ppg) * bpg;
+		detail::csi2::pack_group<BitDepth>(dst, vals);
+	}
+};
+
+} // namespace pixpat
-- 
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