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1 files changed, 280 insertions, 0 deletions

diff --git a/anim-crop-tool/main.cpp b/anim-crop-tool/main.cpp
new file mode 100644
index 00000000..42d54baa
--- /dev/null
+++ b/anim-crop-tool/main.cpp
@@ -0,0 +1,280 @@
+#undef NDEBUG
+
+#include "defs.hpp"
+#include "atlas.hpp"
+#include "anim/serialize.hpp"
+
+#include <cassert>
+#include <cmath>
+#include <cstring>
+
+#include <algorithm>
+#include <utility>
+#include <tuple>
+
+#include <filesystem>
+
+#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>
+
+using Corrade::Utility::Error;
+using Corrade::Utility::Debug;
+
+using std::filesystem::path;
+
+struct options
+{
+    double scale = 0;
+    path input_dir, input_file, output_dir;
+    int width = 0, height = 0, nframes = 0;
+};
+
+[[nodiscard]]
+static std::tuple<cv::Vec2i, cv::Vec2i, bool> find_image_bounds(const cv::Mat4b& mat) noexcept
+{
+    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};
+            if (cv::Vec4b px = ptr[x]; 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])
+        return {start, end, true};
+    else
+        return {{}, {}, false};
+}
+
+[[nodiscard]]
+static bool load_file(anim_group& group, options& opts, anim_atlas& atlas, const path& filename) noexcept
+{
+    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(mat);
+
+    if (!bounds_ok)
+    {
+        Error{} << "no valid image data in" << filename;
+        return false;
+    }
+
+    cv::Size size{end - start};
+
+    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);
+    }
+
+    const cv::Size 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);
+
+    const 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(resized)});
+    return true;
+}
+
+[[nodiscard]]
+static bool load_directory(anim_group& group, options& opts, anim_atlas& atlas) noexcept
+{
+    const auto input_dir = opts.input_dir/group.name;
+
+    if (std::error_code ec; !std::filesystem::exists(input_dir/".", ec))
+    {
+        Error{Error::Flag::NoSpace} << "can't open directory " << input_dir << ": " << ec.message();
+        return false;
+    }
+
+    int max;
+    for (max = 1; max <= 9999; max++)
+    {
+        char filename[9];
+        sprintf(filename, "%04d.png", max);
+        if (std::error_code ec; !std::filesystem::exists(input_dir/filename, ec))
+            break;
+    }
+
+    if (max == 1)
+    {
+        Error{Error::Flag::NoSpace} << "no files in directory " << input_dir << "!";
+        return false;
+    }
+
+    if (!opts.nframes)
+        opts.nframes = max-1;
+    else if (opts.nframes != max-1)
+    {
+        Error{Error::Flag::NoSpace} << "wrong frame count for direction '"
+                                    << group.name << "' -- " << max-1
+                                    << " should be " << opts.nframes;
+        return false;
+    }
+
+    group.frames.clear();
+    // atlas stores its entries through a pointer.
+    // vector::reserve() is necessary to avoid use-after-free.
+    group.frames.reserve((std::size_t)max-1);
+
+    for (int i = 1; i < max; i++)
+    {
+        char filename[9];
+        sprintf(filename, "%04d.png", i);
+        if (!load_file(group, opts, atlas, input_dir/filename))
+            return false;
+    }
+
+    atlas.advance_row();
+
+    return true;
+}
+
+static char* fix_argv0(char* argv0) noexcept
+{
+#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;
+}
+
+using Corrade::Utility::Arguments;
+
+static std::tuple<options, Arguments, bool> parse_cmdline(int argc, const char* const* argv) noexcept
+{
+    Corrade::Utility::Arguments args{};
+    args.addOption('o', "output")
+        .addArgument("input")
+        .addOption('W', "width", "")
+        .addOption('H', "height", "");
+    args.parse(argc, argv);
+    options opts;
+    if (int w = args.value<int>("width"); w != 0)
+        opts.width = w;
+    if (int h = args.value<int>("height"); h != 0)
+        opts.height = h;
+    opts.input_file = args.value<std::string>("input");
+    opts.input_dir = opts.input_file.parent_path();
+
+    if (opts.output_dir.empty())
+        opts.output_dir = opts.input_dir;
+
+    return { std::move(opts), std::move(args), true };
+}
+
+[[nodiscard]] static int usage(const Arguments& args) noexcept
+{
+    Error{Error::Flag::NoNewlineAtTheEnd} << args.usage();
+    return EX_USAGE;
+}
+
+[[nodiscard]] static bool check_atlas_name(const std::string& str) noexcept
+{
+    constexpr auto npos = std::string::npos;
+
+    if (str.empty())
+        return false;
+    if (str[0] == '.' || str[0] == '\\' || str[0] == '/')
+        return false;
+    if (str.find('"') != npos || str.find('\'') != npos)
+        return false;
+    if (str.find("/.") != npos || str.find("\\.") != npos)
+        return false; // NOLINT(readability-simplify-boolean-expr)
+
+    return true;
+}
+
+int main(int argc, char** argv)
+{
+    argv[0] = fix_argv0(argv[0]);
+    auto [opts, args, opts_ok] = parse_cmdline(argc, argv);
+    if (!opts_ok)
+        return usage(args);
+
+    auto [anim_info, anim_ok] = anim::from_json(opts.input_file);
+
+    if (!anim_ok)
+        return EX_DATAERR;
+
+    if (!check_atlas_name(anim_info.name))
+    {
+        Error{Error::Flag::NoSpace} << "atlas name '" << anim_info.name << "' contains invalid characters";
+        return EX_DATAERR;
+    }
+
+    if (!opts.width)
+        opts.width = anim_info.width;
+    if (!opts.height)
+        opts.height = anim_info.height;
+    opts.nframes = anim_info.nframes;
+
+    if (!(opts.width ^ opts.height) || opts.width < 0 || opts.height < 0)
+    {
+        Error{} << "exactly one of --width, --height must be specified";
+        return usage(args);
+    }
+
+    anim_atlas atlas;
+
+    for (anim_group& group : anim_info.groups)
+        if (!load_directory(group, opts, atlas))
+            return EX_DATAERR;
+
+    if (!atlas.dump(opts.output_dir/(anim_info.name + ".png")))
+        return EX_CANTCREAT;
+    if (!anim_info.to_json(opts.output_dir/(anim_info.name + ".json")))
+        return EX_CANTCREAT;
+
+    return 0;
+}