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#include <iostream>
#include <fstream>
#include <sstream>
#include <optional>
#include <filesystem>
#include <cassert>
#include <cstdlib>
#include <cstdint>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
namespace
{
enum class type
{
mask,
image,
};
enum class status
{
ok,
invalid,
};
struct rgba
{
explicit rgba() = default;
explicit rgba(std::uint8_t const r, std::uint8_t const g, std::uint8_t const b, std::uint8_t const a)
: r{ r }
, g{ g }
, b{ b }
, a{ a }
{
}
static auto from_hex(std::uint32_t const hex) -> rgba
{
auto res = rgba{};
res.r = static_cast<std::uint8_t>((hex & 0xFF000000) >> 24);
res.g = static_cast<std::uint8_t>((hex & 0x00FF0000) >> 16);
res.b = static_cast<std::uint8_t>((hex & 0x0000FF00) >> 8);
res.a = static_cast<std::uint8_t>((hex & 0x000000FF) >> 0);
return res;
}
std::uint8_t r{ 0 };
std::uint8_t g{ 0 };
std::uint8_t b{ 0 };
std::uint8_t a{ 0 };
};
auto operator==(rgba const lhs, rgba const rhs) -> bool
{
return lhs.r == rhs.r && lhs.g == rhs.g && lhs.b == rhs.b && lhs.a == rhs.a;
}
/// A decoded image.
class image
{
std::string name_;
std::unique_ptr<unsigned char[], void(*)(void*)> data_;
unsigned width_{ 0 };
unsigned height_{ 0 };
explicit image(std::string name, unsigned char* data, unsigned const width, unsigned const height)
: name_{ std::move(name) }
, data_{ data, stbi_image_free }
, width_{ width }
, height_{ height }
{
}
public:
static auto load(char const* path) -> std::optional<image>
{
int x, y;
auto const data = stbi_load(path, &x, &y, nullptr, 4);
if (!data) { return std::nullopt; }
assert(x >= 0);
assert(y >= 0);
auto name = std::string{ std::filesystem::path(path).stem() };
for (auto& c : name)
{
if (c >= 'a' && c <= 'z') { continue; }
if (c >= '0' && c <= '9') { continue; }
if (c >= 'A' && c <= 'Z')
{
c = (c - 'A') + 'a';
continue;
}
c = '_';
}
return image{ std::move(name), data, static_cast<unsigned>(x), static_cast<unsigned>(y) };
}
auto get_name() const -> std::string_view { return name_; }
auto get_width() const -> unsigned { return width_; }
auto get_height() const -> unsigned { return height_; }
auto get(unsigned const x, unsigned const y) const -> rgba
{
assert(x < width_);
assert(y < height_);
auto const offset = y * width_ + x;
return rgba{ data_[offset * 4 + 0], data_[offset * 4 + 1], data_[offset * 4 + 2], data_[offset * 4 + 3] };
}
};
auto decode_type(std::string_view const t) -> std::optional<type>
{
if (t == "mask") { return type::mask; }
if (t == "image") { return type::image; }
return std::nullopt;
}
auto encode_mask(std::stringstream& header, std::stringstream& source, image const& img) -> status
{
if (img.get_width() != 8) { return status::invalid; }
if (img.get_height() != 8) { return status::invalid; }
header << "\textern mask_tile const " << img.get_name() << ";\n";
source << "\textern auto const " << img.get_name() << " = mask_tile\n";
source << "\t{\n";
for (auto y = unsigned{ 0 }; y < img.get_height(); ++y)
{
source << "\t\t0b";
for (auto x = unsigned{ 0 }; x < img.get_width(); ++x)
{
if (img.get(x, y).a > 0)
{
source << '1';
}
else
{
source << '0';
}
}
source << ",\n";
}
source << "\t};\n\n";
return status::ok;
}
/// Generate the constructor call for a single image tile.
auto generate_image_tile(std::stringstream& str, image const& img, unsigned const x, unsigned const y) -> status
{
str << "\t{\n";
for (auto y_px = unsigned{ 0 }; y_px < 8; ++y_px)
{
str << "\t\t";
for (auto x_px = unsigned{ 0 }; x_px < 8; ++x_px)
{
auto const color = img.get(x * 8 + x_px, y * 8 + y_px);
str << "color{ ";
if (color.a == 0) { str << "0x0"; }
else if (color == rgba::from_hex(0x004058FF)) { str << "0x1"; }
else if (color == rgba::from_hex(0x002B3BFF)) { str << "0x2"; }
else if (color == rgba::from_hex(0xFCFCFCFF)) { str << "0x3"; }
else if (color == rgba::from_hex(0x008888FF)) { str << "0x4"; }
else if (color == rgba::from_hex(0xE45C10FF)) { str << "0x5"; }
else if (color == rgba::from_hex(0x881400FF)) { str << "0x6"; }
else if (color == rgba::from_hex(0xFCFCFCFF)) { str << "0x7"; }
else if (color == rgba::from_hex(0xBCBCBCFF)) { str << "0x8"; }
else if (color == rgba::from_hex(0x000000FF)) { str << "0x9"; }
else { return status::invalid; }
str << " }, ";
}
str << "\n";
}
str << "\t}";
return status::ok;
}
auto encode_image(std::stringstream& header, std::stringstream& source, image const& img) -> status
{
if (img.get_width() % 8 != 0) { return status::invalid; }
if (img.get_height() % 8 != 0) { return status::invalid; }
if (img.get_width() == 8 && img.get_height() == 8)
{
header << "\textern image_tile const " << img.get_name() << ";\n";
source << "\textern auto const " << img.get_name() << " = image_tile\n";
if (generate_image_tile(source, img, 0, 0) != status::ok) { return status::invalid; }
source << ";\n\n";
}
else
{
auto const width_tiles = img.get_width() / 8;
auto const height_tiles = img.get_height() / 8;
header << "\textern image_view const " << img.get_name() << ";\n";
source << "\tstatic image_tile const " << img.get_name() << "_DATA[] = \n";
source << "\t{\n";
for (auto y = unsigned{ 0 }; y < height_tiles; ++y)
{
for (auto x = unsigned{ 0 }; x < width_tiles; ++x)
{
if (generate_image_tile(source, img, x, y) != status::ok) { return status::invalid; }
source << ",\n";
}
}
source << "\t};\n";
source << "\textern auto const " << img.get_name()
<< " = image_view{ " << img.get_name() << "_DATA, " << width_tiles << ", " << height_tiles << " };\n\n";
}
return status::ok;
}
} // namespace
int main(int const argc, char** const argv)
{
if (argc < 5)
{
std::cerr << "Usage:\n";
std::cerr << " " << argv[0] << " <mask|image> <output-header> <output-source> <files...>" << std::endl;
return EXIT_FAILURE;
}
auto const t = decode_type(argv[1]);
if (!t)
{
std::cerr << "Invalid type: " << argv[1] << std::endl;
return EXIT_FAILURE;
}
auto const output_header = std::string_view{ argv[2] };
auto const output_source = std::string_view{ argv[3] };
auto header = std::stringstream{};
auto source = std::stringstream{};
header << "#pragma once\n";
header << "\n";
header << "#include \"nes/app/graphics/mask-tile.hh\"\n";
header << "#include \"nes/app/graphics/image-tile.hh\"\n";
header << "#include \"nes/app/graphics/image-view.hh\"\n";
header << "\n";
header << "namespace nes::app::tiles\n";
header << "{\n";
source << "#include \"nes/app/graphics/mask-tile.hh\"\n";
source << "#include \"nes/app/graphics/image-tile.hh\"\n";
source << "#include \"nes/app/graphics/image-view.hh\"\n";
source << "\n";
source << "namespace nes::app::tiles\n";
source << "{\n\n";
for (auto i = 4; i < argc; ++i)
{
auto const img = image::load(argv[i]);
if (!img)
{
std::cerr << "Unable to load file: " << argv[i] << std::endl;
return EXIT_FAILURE;
}
auto res = status::invalid;
switch (*t)
{
case type::mask:
res = encode_mask(header, source, *img);
break;
case type::image:
res = encode_image(header, source, *img);
break;
}
if (res != status::ok)
{
std::cerr << "Input has invalid dimensions: " << argv[i] << std::endl;
return EXIT_FAILURE;
}
}
header << "} // namespace nes::app::tiles\n";
source << "} // namespace nes::app::tiles\n";
auto header_file = std::ofstream{ std::string{ output_header } };
header_file << header.str();
header_file.flush();
auto source_file = std::ofstream{ std::string{ output_source } };
source_file << source.str();
source_file.flush();
return EXIT_SUCCESS;
}
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