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py_encre.cpp
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#include <encre.hpp>
#include <pybind11/pybind11.h>
#include <pybind11/stl.h>
#include <pybind11/numpy.h>
#include <string_view>
#include <optional>
namespace py = pybind11;
namespace {
template<typename T>
std::optional<T> try_get(const py::object& object, const char* name) {
if (!object.contains(name)) {
return std::nullopt;
}
return object[name].cast<T>();
}
template<typename T, typename S = T>
const auto read_option(const py::object& object, const char* name, T& storage) {
if (const auto value = try_get<S>(object, name))
storage = *value;
}
template<typename T>
const auto read_option(const py::object& object, const char* name, std::optional<T>& storage) {
read_option<std::optional<T>, T>(object, name, storage);
}
}
PYBIND11_MODULE(py_encre, m) {
m.doc() = "Python bindings for Encre";
py::class_<encre::CIEXYZ>(m, "CIEXYZ").
def(py::init<float, float, float>()).
def_readwrite("x", &encre::CIEXYZ::x).
def_readwrite("y", &encre::CIEXYZ::y).
def_readwrite("z", &encre::CIEXYZ::z);
py::class_<encre::CIELab>(m, "CIELab").
def(py::init<float, float, float>()).
def_readwrite("l", &encre::CIELab::x).
def_readwrite("a", &encre::CIELab::y).
def_readwrite("b", &encre::CIELab::z);
py::class_<encre::Oklab>(m, "Oklab").
def(py::init<float, float, float>()).
def_readwrite("l", &encre::Oklab::x).
def_readwrite("a", &encre::Oklab::y).
def_readwrite("b", &encre::Oklab::z);
py::class_<encre::Plane>(m, "Plane").
def(py::init<float, float, float, float>()).
def_readwrite("a", &encre::Plane::x).
def_readwrite("b", &encre::Plane::y).
def_readwrite("c", &encre::Plane::z).
def_readwrite("d", &encre::Plane::w);
py::class_<encre::Range>(m, "Line").
def(py::init<float, float>()).
def_readwrite("a", &encre::Range::x).
def_readwrite("b", &encre::Range::y);
py::class_<encre::Palette>(m, "Palette").
def_readonly_static("default_target_lightness", &encre::Palette::default_target_lightness).
def_readwrite("points", &encre::Palette::points).
def_readwrite("gamut_vertices", &encre::Palette::gamut_vertices).
def_readwrite("gamut_planes", &encre::Palette::gamut_planes).
def_readwrite("gray_line", &encre::Palette::gray_range).
def_readwrite("lightness_range", &encre::Palette::lightness_range).
def_readwrite("max_chroma", &encre::Palette::max_chroma);
py::enum_<encre::Rotation>(m, "Rotation").
value("automatic", encre::Rotation::automatic).
value("landscape", encre::Rotation::landscape).
value("portrait", encre::Rotation::portrait).
value("landscape_upside_down", encre::Rotation::landscape_upside_down).
value("portrait_upside_down", encre::Rotation::portrait_upside_down);
m.attr("rotation_by_name") = encre::rotation_by_name;
py::class_<encre::Options>(m, "Options").
def(py::init([](const py::kwargs& arguments) {
encre::Options options{};
if (const auto value = try_get<std::string>(arguments, "rotation"))
options.rotation = encre::rotation_by_name.at(*value);
read_option(arguments, "dynamic_range", options.dynamic_range);
read_option(arguments, "exposure", options.exposure);
read_option(arguments, "brightness", options.brightness);
read_option(arguments, "contrast", options.contrast);
read_option(arguments, "sharpening", options.sharpening);
read_option(arguments, "gray_chroma_tolerance", options.gray_chroma_tolerance);
read_option(arguments, "hue_dependent_chroma_clamping", options.hue_dependent_chroma_clamping);
read_option(arguments, "clipped_chroma_recovery", options.clipped_chroma_recovery);
read_option(arguments, "error_attenuation", options.error_attenuation);
return options;
})).
def_readonly_static("default_rotation", &encre::Options::default_rotation).
def_readonly_static("default_dynamic_range", &encre::Options::default_dynamic_range).
def_readonly_static("automatic_brightness", &encre::Options::automatic_brightness).
def_readonly_static("automatic_exposure", &encre::Options::automatic_exposure).
def_readonly_static("no_exposure_change", &encre::Options::no_exposure_change).
def_readonly_static("no_brightness_change", &encre::Options::no_brightness_change).
def_readonly_static("default_contrast", &encre::Options::default_contrast).
def_readonly_static("default_sharpening", &encre::Options::default_sharpening).
def_readonly_static("default_gray_chroma_tolerance", &encre::Options::default_gray_chroma_tolerance).
def_readonly_static("default_hue_dependent_chroma_clamping", &encre::Options::default_hue_dependent_chroma_clamping).
def_readonly_static("default_clipped_chroma_recovery", &encre::Options::default_clipped_chroma_recovery).
def_readonly_static("default_error_attenuation", &encre::Options::default_error_attenuation).
def_readwrite("rotation", &encre::Options::rotation).
def_readwrite("dynamic_range", &encre::Options::dynamic_range).
def_readwrite("exposure", &encre::Options::exposure).
def_readwrite("brightness", &encre::Options::brightness).
def_readwrite("contrast", &encre::Options::contrast).
def_readwrite("sharpening", &encre::Options::sharpening).
def_readwrite("gray_chroma_tolerance", &encre::Options::gray_chroma_tolerance).
def_readwrite("hue_dependent_chroma_clamping", &encre::Options::hue_dependent_chroma_clamping).
def_readwrite("clipped_chroma_recovery", &encre::Options::clipped_chroma_recovery).
def_readwrite("error_attenuation", &encre::Options::error_attenuation);
m.attr("eink_gallery_palette_palette") = encre::eink_gallery_palette_palette;
m.attr("eink_gallery_palette_accurate_palette") = encre::eink_gallery_palette_accurate_palette;
m.attr("eink_spectra_6_palette") = encre::eink_spectra_6_palette;
m.attr("eink_spectra_6_accurate_palette") = encre::eink_spectra_6_accurate_palette;
m.attr("palette_by_name") = encre::palette_by_name;
m.def("initialize", &encre::initialize, py::arg("executable_path"), "Initialize the runtime");
m.def("uninitalize", &encre::uninitalize, "Un-initialize the runtime");
m.def("make_palette_xyz", [](const std::vector<encre::CIEXYZ>& colors, float target_lightness) {
return encre::make_palette(colors, target_lightness);
}, py::arg("colors"), py::arg("target_lightness") = encre::Palette::default_target_lightness, "Make a palette from CIE XYZ colors");
m.def("make_palette_lab", [](const std::vector<encre::CIELab>& colors, float target_lightness) {
return encre::make_palette(colors, target_lightness);
}, py::arg("colors"), py::arg("target_lightness") = encre::Palette::default_target_lightness, "Make a palette from CIE Lab colors");
m.def("convert", [](const char* image_path, const encre::Palette& palette, py::array_t<uint8_t> output,
const encre::Options& options) -> std::optional<encre::Rotation> {
auto mutable_output = output.mutable_unchecked<2>();
const std::span<uint8_t> output_span{mutable_output.mutable_data(0, 0), static_cast<size_t>(mutable_output.size())};
encre::Rotation output_rotation{};
if (!encre::convert(image_path, static_cast<uint32_t>(mutable_output.shape(1)),
palette, options, output_span, &output_rotation)) {
return std::nullopt;
}
return output_rotation;
},
py::arg("image_path"), py::arg("palette"), py::arg("output").noconvert(), py::kw_only(),
py::arg("options") = encre::Options{}, "Convert an image to the palette");
m.def("write_preview", [](py::array_t<const uint8_t> converted, const std::vector<encre::Oklab>& palette_points,
const encre::Rotation& output_rotation, const char* image_path) {
auto output_unchecked = converted.unchecked<2>();
const std::span<const uint8_t> converted_span{output_unchecked.data(0, 0), static_cast<size_t>(output_unchecked.size())};
return encre::write_preview(converted_span, static_cast<uint32_t>(output_unchecked.shape(1)),
palette_points, output_rotation, image_path);
},
py::arg("converted").noconvert(), py::arg("palette_points"),
py::arg("output_rotation"), py::arg("image_path"), "Write a preview of a conversion output");
m.def("write_encre_file", [](py::array_t<const uint8_t> converted, const std::vector<encre::Oklab>& palette_points,
const encre::Rotation& output_rotation, const char* image_path) {
auto output_unchecked = converted.unchecked<2>();
const std::span<const uint8_t> converted_span{output_unchecked.data(0, 0), static_cast<size_t>(output_unchecked.size())};
return encre::write_encre_file(converted_span, static_cast<uint32_t>(output_unchecked.shape(1)),
palette_points, output_rotation, image_path);
},
py::arg("converted").noconvert(), py::arg("palette_points"),
py::arg("output_rotation"), py::arg("image_path"), "Write a binary for a conversion output");
m.def("read_encre_file", [](const char* image_path) {
std::vector<uint8_t> converted;
uint32_t width;
std::vector<encre::Oklab> palette_points;
encre::Rotation output_rotation;
using ReturnType = std::optional<decltype(std::make_tuple(converted, width, palette_points, output_rotation))>;
if (!encre::read_encre_file(image_path, converted, width, palette_points, output_rotation)) {
return ReturnType{};
}
return ReturnType{std::make_tuple(std::move(converted), width, std::move(palette_points), output_rotation)};
}, py::arg("image_path"), "Read a binary written by write_encre_file()");
m.def("read_compatible_encre_file", [](const char* image_path, size_t palette_size, py::array_t<uint8_t> output) ->
std::optional<encre::Rotation> {
auto mutable_output = output.mutable_unchecked<2>();
const std::span<uint8_t> output_span{mutable_output.mutable_data(0, 0), static_cast<size_t>(mutable_output.size())};
encre::Rotation output_rotation;
if (!encre::read_compatible_encre_file(image_path, static_cast<uint32_t>(mutable_output.shape(1)), palette_size,
output_span, &output_rotation)) {
return std::nullopt;
}
return output_rotation;
}, py::arg("image_path"), py::arg("output").noconvert(), py::arg("palette_size"),
"Read a binary written by write_encre_file() if the size and palette match");
}