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swap.cpp
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94 lines (82 loc) · 2.82 KB
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/*
Copyright (C) 2017-2026 Topological Manifold
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "swap.h"
#include "format.h"
#include <src/com/error.h>
#include <src/com/print.h>
#include <array>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <span>
namespace ns::image
{
namespace
{
template <typename T, std::size_t COUNT>
void swap_rb(const std::span<std::byte> bytes)
{
static_assert(COUNT >= 3);
constexpr std::size_t SIZE = sizeof(T) * COUNT;
if (bytes.size() % SIZE != 0)
{
error("Error data size " + to_string(bytes.size()) + " for color component swapping");
}
std::byte* ptr = bytes.data();
const std::byte* const end = ptr + bytes.size();
while (ptr != end)
{
std::array<T, 3> data;
std::memcpy(data.data(), ptr, sizeof(T) * 3);
std::swap(data[0], data[2]);
std::memcpy(ptr, data.data(), sizeof(T) * 3);
ptr += SIZE;
}
}
}
void swap_rb(const ColorFormat color_format, const std::span<std::byte>& bytes)
{
switch (color_format)
{
case ColorFormat::R8G8B8_SRGB:
swap_rb<std::uint8_t, 3>(bytes);
return;
case ColorFormat::R8G8B8A8_SRGB:
case ColorFormat::R8G8B8A8_SRGB_PREMULTIPLIED:
swap_rb<std::uint8_t, 4>(bytes);
return;
case ColorFormat::R16G16B16:
case ColorFormat::R16G16B16_SRGB:
swap_rb<std::uint16_t, 3>(bytes);
return;
case ColorFormat::R16G16B16A16:
case ColorFormat::R16G16B16A16_SRGB:
case ColorFormat::R16G16B16A16_PREMULTIPLIED:
swap_rb<std::uint16_t, 4>(bytes);
return;
case ColorFormat::R32G32B32:
swap_rb<float, 3>(bytes);
return;
case ColorFormat::R32G32B32A32:
case ColorFormat::R32G32B32A32_PREMULTIPLIED:
swap_rb<float, 4>(bytes);
return;
case ColorFormat::R8_SRGB:
case ColorFormat::R16:
case ColorFormat::R32:
break;
}
error("Unsupported image format " + format_to_string(color_format) + " for color component swapping");
}
}