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#include "defs.hpp"
#include "anim/atlas.hpp"
#include "anim/serialize.hpp"
#include <Corrade/Utility/Arguments.h>
#include <Corrade/Utility/Debug.h>
#include <Corrade/Utility/DebugStl.h>
#include <opencv2/core/mat.hpp>
#include <opencv2/imgcodecs/imgcodecs.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <algorithm>
#include <utility>
#include <tuple>
#include <cmath>
#include <cstring>
#include <filesystem>
using Corrade::Utility::Error;
using Corrade::Utility::Debug;
using std::filesystem::path;
struct options
{
unsigned width = 0, height = 0;
double scale = 0;
path input_dir, output_dir;
};
[[nodiscard]]
static std::tuple<cv::Vec2i, cv::Vec2i, bool> find_image_bounds(const path& path, const cv::Mat4b& mat)
{
cv::Vec2i start{mat.cols, mat.rows}, end{0, 0};
for (int y = 0; y < mat.rows; y++)
{
const auto* ptr = mat.ptr<cv::Vec4b>(y);
for (int x = 0; x < mat.cols; x++)
{
enum {R, G, B, A};
cv::Vec4b px = ptr[x];
if (px[A] != 0)
{
start[0] = std::min(x, start[0]);
start[1] = std::min(y, start[1]);
end[0] = std::max(x+1, end[0]);
end[1] = std::max(y+1, end[1]);
}
}
}
if (start[0] >= end[0] || start[1] >= end[1])
{
Error{} << "image" << path << "contains only fully transparent pixels!";
return {{}, {}, false};
}
return {start, end, true};
}
[[nodiscard]]
static bool load_file(anim_group& group, options& opts, anim_atlas& atlas, const path& filename)
{
auto mat = progn(
cv::Mat mat_ = cv::imread(filename.string(), cv::IMREAD_UNCHANGED);
if (mat_.empty() || mat_.type() != CV_8UC4)
{
Error{} << "failed to load" << filename << "as RGBA32 image";
return cv::Mat4b{};
}
return cv::Mat4b(std::move(mat_));
);
if (mat.empty())
return false;
auto [start, end, bounds_ok] = find_image_bounds(filename, mat);
if (!bounds_ok)
return false;
cv::Size size{end - start}, dest_size;
if (opts.scale == 0.0)
{
ASSERT(opts.width || opts.height);
if (opts.width)
opts.scale = (double)opts.width / size.width;
else
opts.scale = (double)opts.height / size.height;
ASSERT(opts.scale > 1e-6);
}
dest_size = {(int)std::round(opts.scale * size.width),
(int)std::round(opts.scale * size.height)};
if (size.width < dest_size.width || size.height < dest_size.height)
{
Error{} << "refusing to upscale image" << filename;
return false;
}
cv::Mat4b resized{size};
cv::resize(mat({start, size}), resized, dest_size, 0, 0, cv::INTER_LANCZOS4);
#if 0
if (!cv::imwrite(output_filename.string(), resized))
{
Error{} << "failed writing image" << output_filename;
return false;
}
#endif
Magnum::Vector2i ground = {
(int)std::round((group.ground[0] - start[0]) * opts.scale),
(int)std::round((group.ground[1] - start[1]) * opts.scale),
};
group.frames.push_back({ground, atlas.offset(), {dest_size.width, dest_size.height}});
atlas.add_entry({&group.frames.back(), std::move(mat)});
return true;
}
[[nodiscard]]
static bool load_directory(anim_group& group, options& opts, anim_atlas& atlas, const path& input_dir)
{
if (std::error_code ec; !std::filesystem::exists(input_dir/".", ec))
{
Error{} << "can't open directory" << input_dir << ':' << ec.message();
return false;
}
std::size_t max;
for (max = 1; max <= 9999; max++)
{
char filename[9];
sprintf(filename, "%04zu.png", max);
if (!std::filesystem::exists(input_dir/filename))
break;
}
group.frames.clear();
// atlas stores its entries through a pointer.
// vector::reserve() is necessary to avoid use-after-free.
group.frames.reserve(max-1);
for (std::size_t i = 1; i < max; i++)
{
char filename[9];
sprintf(filename, "%04zu.png", i);
if (!load_file(group, opts, atlas, input_dir/filename))
return false;
}
atlas.advance_row();
return true;
}
static char* fix_argv0(char* argv0)
{
#ifdef _WIN32
if (auto* c = strrchr(argv0, '\\'); c && c[1])
{
if (auto* s = strrchr(c, '.'); s && !strcmp(".exe", s))
*s = '\0';
return c+1;
}
#else
if (auto* c = strrchr(argv[0], '/'); c && c[1])
return c+1;
#endif
return argv0;
}
static std::tuple<options, bool> parse_cmdline(int argc, const char* const* argv)
{
Corrade::Utility::Arguments args{};
args.addOption('o', "output")
.addArgument("directory")
.addOption('W', "width", "")
.addOption('H', "height", "");
args.parse(argc, argv);
options opts;
if (unsigned w = args.value<unsigned>("width"); w != 0)
opts.width = w;
if (unsigned h = args.value<unsigned>("height"); h != 0)
opts.height = h;
if (!(!opts.width ^ !opts.height))
{
Error{} << "exactly one of --width, --height must be given";
goto usage;
}
opts.output_dir = args.value<std::string>("output");
opts.input_dir = args.value<std::string>("directory");
if (opts.output_dir.empty())
opts.output_dir = opts.input_dir;
return { opts, false };
usage:
Error{Error::Flag::NoNewlineAtTheEnd} << args.usage();
return { {}, true };
}
int main(int argc, char** argv)
{
argv[0] = fix_argv0(argv[0]);
auto [opts, error_code] = parse_cmdline(argc, argv);
if (error_code)
return error_code;
auto anim_info = anim::from_json(opts.input_dir/"atlas.json");
if (!anim_info)
return EX_DATAERR;
if (std::error_code error;
!std::filesystem::exists(opts.output_dir/".") &&
!std::filesystem::create_directory(opts.output_dir, error))
{
Error{} << "failed to create output directory" << opts.output_dir << ':' << error.message();
return EX_CANTCREAT;
}
anim_atlas atlas;
for (anim_group& group : anim_info->groups)
{
group.frames.clear(); group.frames.reserve(64);
if (!load_directory(group, opts, atlas, opts.input_dir/group.name))
return EX_DATAERR;
if (!atlas.dump(opts.output_dir/"atlas.png"))
return EX_CANTCREAT;
if (!anim_info->to_json(opts.output_dir/"atlas.json.new"))
return EX_CANTCREAT;
}
return 0;
}
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