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#pragma once
#include <cstddef>
#include "color.h"
#include "layout.h"
// Inlined source → color → sink composition. The intermediate Pixel
// values stay in registers across stages; there is no normalized RGB16
// or YUV16 buffer between source and sink. Block size is dictated by
// the sink: 1x1 for non-subsampled formats, h_sub × v_sub for chroma-
// subsampled ones.
namespace pixpat
{
template <typename Source, typename Sink>
struct Converter {
using Xfm = ColorXfm<typename Source::Pixel, typename Sink::Pixel>;
static constexpr size_t bh = Sink::block_h;
static constexpr size_t bw = Sink::block_w;
static void run(const Buffer<Source::Layout::num_planes>& src,
Buffer<Sink::Layout::num_planes>& dst,
size_t W, size_t H,
size_t by_start, size_t by_end,
ColorSpec spec) noexcept
{
const ColorCoeffs c = coeffs_for(spec);
for (size_t by = by_start; by < by_end; by += bh) {
for (size_t bx = 0; bx < W; bx += bw) {
typename Sink::Pixel block[bh][bw];
for (size_t dy = 0; dy < bh; ++dy)
for (size_t dx = 0; dx < bw; ++dx)
block[dy][dx] = Xfm::apply(
Source::read(src, bx + dx, by + dy,
W, H), c);
Sink::write_block(dst, bx, by, block);
}
}
}
};
} // namespace pixpat
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