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normalize.cpp
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111 lines (95 loc) · 3.46 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 "normalize.h"
#include "format.h"
#include "max.h"
#include <src/com/error.h>
#include <src/com/print.h>
#include <array>
#include <cstddef>
#include <cstring>
#include <optional>
#include <span>
#include <vector>
namespace ns::image
{
namespace
{
template <std::size_t COLOR_COUNT, std::size_t COMPONENT_COUNT>
void normalize(const ColorFormat color_format, std::vector<std::byte>* const bytes)
{
static_assert(COLOR_COUNT > 0 && COLOR_COUNT <= COMPONENT_COUNT);
static constexpr std::size_t COLOR_SIZE = COLOR_COUNT * sizeof(float);
static constexpr std::size_t PIXEL_SIZE = COMPONENT_COUNT * sizeof(float);
if (bytes->size() % PIXEL_SIZE != 0)
{
error("Error size " + to_string(bytes->size()) + " for normalizing " + to_string(COMPONENT_COUNT)
+ "-component pixels");
}
const auto image_max = max(color_format, *bytes);
if (!image_max)
{
return;
}
const float max = *image_max;
if (!(max > 0 && max != 1))
{
return;
}
std::byte* ptr = bytes->data();
const std::byte* const end = bytes->data() + bytes->size();
while (ptr != end)
{
std::array<float, COLOR_COUNT> pixel;
static_assert(std::span<float>(pixel).size_bytes() == COLOR_SIZE);
std::memcpy(pixel.data(), ptr, COLOR_SIZE);
for (std::size_t i = 0; i < COLOR_COUNT; ++i)
{
pixel[i] /= max;
}
std::memcpy(ptr, pixel.data(), COLOR_SIZE);
ptr += PIXEL_SIZE;
}
ASSERT(ptr == bytes->data() + bytes->size());
}
}
void normalize(const ColorFormat color_format, std::vector<std::byte>* const bytes)
{
switch (color_format)
{
case ColorFormat::R8_SRGB:
case ColorFormat::R16:
case ColorFormat::R8G8B8_SRGB:
case ColorFormat::R8G8B8A8_SRGB:
case ColorFormat::R8G8B8A8_SRGB_PREMULTIPLIED:
case ColorFormat::R16G16B16:
case ColorFormat::R16G16B16_SRGB:
case ColorFormat::R16G16B16A16:
case ColorFormat::R16G16B16A16_SRGB:
case ColorFormat::R16G16B16A16_PREMULTIPLIED:
error("Unsupported image format " + format_to_string(color_format) + " for normalizing");
case ColorFormat::R32:
normalize<1, 1>(color_format, bytes);
return;
case ColorFormat::R32G32B32:
normalize<3, 3>(color_format, bytes);
return;
case ColorFormat::R32G32B32A32:
case ColorFormat::R32G32B32A32_PREMULTIPLIED:
normalize<3, 4>(color_format, bytes);
return;
}
unknown_color_format_error(color_format);
}
}