update readme

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "external/FastLZ"]
+	path = external/FastLZ
+	url = https://github.com/ariya/FastLZ.git
+[submodule "external/murmurhash"]
+	path = external/murmurhash
+	url = https://github.com/jwerle/murmurhash.c.git

CMakeLists.txt

@@ -12,24 +12,34 @@ project(${PROJECT_NAME} VERSION ${PROJECT_VERSION})
 
 list(APPEND CMAKE_MODULE_PATH "/opt/cmake")
 
-find_package(argh)
 find_package(LIQ)
 find_package(STB)
 
+include(FetchContent)
+FetchContent_Declare(
+    argparse
+    GIT_REPOSITORY https://github.com/p-ranav/argparse.git
+)
+FetchContent_MakeAvailable(argparse)
+
 ##############################################################
 
 # yes... im using glob... dont judge me....
 file(GLOB_RECURSE PROJECT_SOURCES CONFIGURE_DEPENDS "src/*.cpp")
-file(GLOB VENDOR_SOURCES CONFIGURE_DEPENDS "")
+file(GLOB EXTERNAL_SOURCES CONFIGURE_DEPENDS
+    "external/murmurhash/murmurhash.c"
+    "external/FastLZ/fastlz.c")
 
 set(PROJECT_INCLUDE
     "src"
-    ${argh_INCLUDE_DIR}
     ${STB_INCLUDE_DIRS}
-    ${LIQ_INCLUDE_DIRS})
+    ${LIQ_INCLUDE_DIRS}
+    "external/ChernoTimer"
+    "external/murmurhash"
+    "external/FastLZ")
 
 set(PROJECT_LIBRARY
-    argh
+    argparse
     ${LIQ_LIBRARIES})
 
 set(PROJECT_DEFINITION
@@ -37,7 +47,7 @@ set(PROJECT_DEFINITION
 
 ##############################################################
 
-add_executable(${PROJECT_NAME} ${PROJECT_SOURCES} ${VENDOR_SOURCES})
+add_executable(${PROJECT_NAME} ${PROJECT_SOURCES} ${EXTERNAL_SOURCES})
 target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_INCLUDE})
 target_link_libraries(${PROJECT_NAME} PRIVATE ${PROJECT_LIBRARY})
 target_compile_definitions(${PROJECT_NAME} PUBLIC ${PROJECT_DEFINITION})

external/FastLZ

@@ -0,0 +1 @@
+Subproject commit b1342dabcf5257ab303743c9332fe75e9147a011

external/murmurhash

@@ -0,0 +1 @@
+Subproject commit 10ba9c25abbcf8952b5f4abecf9bf4fc148e8e65

readme.txt

@@ -9,32 +9,23 @@ i tried to create header with the metadata information of the image
 
 the idea is to simply load image data without worrying about image metadata.
 the metadata contain basic stuff like width, height, format, etc...
-there is also paletteId that tell which palette the image used.
 
-usage: sillyimage <input image> [options]
+color palette are embedded in the file.
+a palette hash is provided. this can be used to comparing
+whether another image uses the same palette
+
+usage: sillyimage -i <input image> -o <output dir> [options]
 
 options:
-  -o, --out
-    output directory
-
-  -f, --format 
-    specify format {rgb256, rgb16, indexed4, indexed16, indexed256, indexed32a3, indexed8a5}
-
-  -c, --compress
-    specify compression {none, lzsswram, lzssvram, gzip}
-
-  -pid, --palette-id
-    specify the palette id
-
-  -n, --num
-    limit num color regardless of the format
-
-  -v, --verbose
-    enable verbose printing
+  -i, --input    input files [required] [may be repeated]
+  -o, --out      output directory [required]
+  -h, --help     shows help message and exits 
+  -v, --version  prints version information and exits 
+  -f, --format   texture format { rgb256, rgb16, indexed4, indexed16, indexed256, indexed32a3, indexed8a5 } [default: "rgb16"]
 
 binary format:
   [string] sillyimg (0x676D69796C6C6973 in hex or 7452728928599042419 in decimal (uint64))
-  [uint8] version (current version is 0)
+  [uint8] version (current version is 13)
   [uint8] format
     0 - RGB256
     1 - RGB16
@@ -44,16 +35,14 @@ binary format:
     5 - INDEXED32A3
     6 - INDEXED8A5
     7 - PALETTE16
-  [uint8] paletteId
   [uint16] width
   [uint16] height
-  [uint8] compression
-    0 - none
-    1 - lzss wram
-    2 - lzss vram
-    3 - gzip
-  [uint32] buffer length
-  [buffer]
+  [uint16] palette count
+  [uint32] palette hash
+  [uint32] compress size
+  [uint32] original size
+  [palette buffer]
+  [image buffer]
 
 TODO:
   [x] bitpacking for indexed format
@@ -61,13 +50,14 @@ TODO:
   [ ] convert image using predefined palette
   [ ] output preview image
   [ ] improve error handling
-  [ ] compression
+  [x] compression
 
-dependecies:
-  argh (https://github.com/adishavit/argh)
-  stb_image, stb_image_writer (https://github.com/nothings/stb)
+dependencies:
+  argparse (https://github.com/p-ranav/argparse)
+  stb_image (https://github.com/nothings/stb)
   libimagequant (https://github.com/ImageOptim/libimagequant)
-  TImer.h from cherno (https://gist.github.com/TheCherno/b2c71c9291a4a1a29c889e76173c8d14)
+  murmurhash.c (https://github.com/jwerle/murmurhash.c)
+  Timer.h from cherno (https://gist.github.com/TheCherno/b2c71c9291a4a1a29c889e76173c8d14)
 
 license:
   GPL v3

src/header.hpp

@@ -16,18 +16,23 @@
 #include <string>
 #include <vector>
 
-#pragma pack(push, 1)  // Set the alignment to 1 byte (no padding)
+// wporkaround surpress clangd pragma pack warning
+// https://github.com/clangd/clangd/issues/1167
+static_assert(true);
+
+#pragma pack(push, 1)
 struct Metadata {
 	uint64_t header = 0x676D69796C6C6973;
-	uint8_t version = 0;
+	uint8_t version = 13;
 	uint8_t format;
-	uint8_t paletteId;
 	uint16_t width;
 	uint16_t height;
-	uint8_t compression;
-	uint32_t length;
+	uint16_t palette_count;
+	uint32_t palette_hash;
+	uint32_t original_size;
+	uint32_t compress_size;
 };
-#pragma pack(pop)  // Restore the previous alignment
+#pragma pack(pop)
 
 enum Format
 {
@@ -41,14 +46,6 @@ enum Format
 	Format_PALETTE_16,
 };
 
-enum Compress
-{
-	Compress_NONE = 0,
-	Compress_LZSS_WRAM,
-	Compress_LZSS_VRAM,
-	Compress_GZIP,
-};
-
 struct Image {
 	int width, height, comp;
 	stbi_uc *data;
@@ -79,27 +76,15 @@ struct Color {
 	uint8_t b;
 };
 
-struct Params {
-	std::vector<std::filesystem::path> input_list;
-	std::filesystem::path output_dir;
-	
-	Format format;
-	Compress compress;
-
-	int paletteId;
-	int limitColor = 0;
-	bool verbose = false;
-	bool paletteOnly = false;
-
-	void Parse(int argc, char **argv);
-	void Convert();
-	void PrintHelp();
-	void Print(const std::string &msg);
-
+struct Options {
+	std::vector<std::string> path_input;
+	std::string path_output;
+	std::string format;
 };
 
+void Verify();
+void Convert();
+
 uint16_t RGB16(uint8_t a, uint8_t r, uint8_t g, uint8_t b);
-void GetIndexed(const int numColor, std::vector<Image> &images, std::vector<Color> &palette, std::vector<IndexedImage> &indexes);
-void BitPacking(const uint8_t bpp, IndexedImage &img, uint32_t &length);
-void WritePalette(const std::string &path, const uint8_t paletteId, std::vector<Color> &palette);
-void WriteImage(const std::string &path, const Format &format, const uint16_t width, const uint16_t height, const Compress &compress, const uint8_t paletteId, void *buffer, const uint32_t length);
+void QuantizeImage(const int numColor, std::vector<Image> &images, std::vector<Color> &palette, std::vector<IndexedImage> &indexes);
+void BitPacking(const uint8_t bpp, IndexedImage &img, uint32_t &length);

src/main.cpp

@@ -8,7 +8,6 @@
  * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
  */
 
-#include <algorithm>
 #include <cassert>
 #include <cstdint>
 #include <cstdlib>
@@ -22,33 +21,194 @@
 #define STB_IMAGE_IMPLEMENTATION
 #define STB_IMAGE_WRITE_IMPLEMENTATION
 
-#include "argh.h"
+#include <argparse/argparse.hpp>
 #include "libimagequant.h"
 #include "header.hpp"
-#include "external/Timer.h"
+#include "Timer.h"
+#include "fastlz.h"
+#include "murmurhash.h"
 
 namespace fs = std::filesystem;
 
-static void imagegen_job(uint8_t *image_output, uint8_t *image_indexed, const liq_palette *pal, int start, int end)
-{
-	for (int i=start; i<end; i++)
-	{
-		auto &col = pal->entries[image_indexed[i]];
-		image_output[i*4+0] = col.r;
-		image_output[i*4+1] = col.g;
-		image_output[i*4+2] = col.b;
-		image_output[i*4+3] = col.a;
-	}
-}
-
 int main(int argc, char **argv)
 {
-	try {
-		srand(time(0));
+	srand(time(0));
+	argparse::ArgumentParser program("sillyimage", "1.3");
+	Options opt;
+
+	// Register argument
+	{
+		program.add_argument("-i", "--input")
+			.help("input files")
+			.append()
+			.required()
+			.store_into(opt.path_input);
+
+		program.add_argument("-o", "--out")
+			.help("output directory")
+			.required()
+			.store_into(opt.path_output);
+
+		program.add_argument("-f", "--format")
+			.help("texture format { rgb256, rgb16, indexed4, indexed16, indexed256, indexed32a3, indexed8a5 }")
+			.default_value<std::string>("rgb16")
+			.choices("rgb256", "rgb16", "indexed4", "indexed16", "indexed256", "indexed32a3", "indexed8a5")
+			.nargs(1)
+			.store_into(opt.format);
+	}
+
+	// Parse argument
+	{
+		try
+		{
+			program.parse_args(argc, argv);
+
+			// input list
+			for (auto &i : opt.path_input)
+				if (i.empty() || !fs::exists(i)) 
+					throw std::runtime_error(std::format("file doesnt exsist: \"{}\"", i));
+
+			// output directory
+			if (opt.path_output.empty() || !fs::is_directory(opt.path_output))
+				throw std::runtime_error(std::format("invalid output directory: \"{}\"", opt.path_output));
+
+		}
+		catch(const std::exception &e)
+		{
+			std::cerr << std::format("Error: {}\n\n", e.what()) << program << "\n";
+			return 1;
+		}
+	}
+
+	// Convert
+	try {
+
+		if (opt.format == "rgb256")
+		{
+			for(auto &input : opt.path_input)
+			{
+				Image img;
+				img.Load(input);
+
+				Metadata meta;
+				meta.format = Format::Format_RGB_256;
+				meta.width = img.width;
+				meta.height = img.height;
+				meta.palette_count = 0;
+				meta.palette_hash = 0;
+				meta.original_size = img.width*img.height*img.comp;
+
+				uint8_t compress[uint64_t(meta.original_size*1.5)];
+				meta.compress_size = fastlz_compress_level(1, img.data, meta.original_size, compress);
+
+				auto output = fs::path(opt.path_output) / std::format("{}.sillyimg", fs::path(input).stem().string());
+				std::ofstream out(output, std::ios::binary);
+				out.write(reinterpret_cast<const char*>(&meta), sizeof(meta));
+				out.write(reinterpret_cast<const char*>(compress), meta.compress_size);
+				out.close();
+			}
+		}
+
+		if (opt.format == "rgb16")
+		{
+			for(auto &input : opt.path_input)
+			{
+				Image img;
+				img.Load(input);
+				uint16_t img16[img.width*img.height];
+
+				// convert into RGB16 color
+				for (int i=0; i<img.width*img.height; i++)
+				{
+					uint8_t a = img.data[i*4+3];
+					uint8_t r = img.data[i*4+0];
+					uint8_t g = img.data[i*4+1];
+					uint8_t b = img.data[i*4+2];
+
+					img16[i] = RGB16(a, r, g, b);
+				}
+
+				Metadata meta;
+				meta.format = Format::Format_RGB_16;
+				meta.width = img.width;
+				meta.height = img.height;
+				meta.palette_count = 0;
+				meta.palette_hash = 0;
+				meta.original_size = img.width*img.height*2;
+
+				uint8_t compress[uint64_t(meta.original_size*1.5)];
+				meta.compress_size = fastlz_compress_level(1, img16, meta.original_size, compress);
+
+				auto output = fs::path(opt.path_output) / std::format("{}.sillyimg", fs::path(input).stem().string());
+				std::ofstream out(output, std::ios::binary);
+				out.write(reinterpret_cast<const char*>(&meta), sizeof(meta));
+				out.write(reinterpret_cast<const char*>(compress), meta.compress_size);
+				out.close();
+			}
+		}
+
+		if (opt.format == "indexed4" || opt.format == "indexed16" || opt.format == "indexed256")
+		{
+			uint16_t numcol;
+			uint16_t bpp;
+
+			if (opt.format == "indexed4")
+			{
+				numcol = 4;
+				bpp = 2;
+			}
+			if (opt.format == "indexed16")
+			{
+				numcol = 16;
+				bpp = 4;
+			}
+			if (opt.format == "indexed256")
+			{
+				numcol = 256;
+				bpp = 8;
+			}
+
+			std::vector<Color> palette;
+			std::vector<Image> images(opt.path_input.size());
+			std::vector<IndexedImage> indexes(opt.path_input.size());
+			
+			for (int i=0; i<images.size(); i++)
+				images[i].Load(opt.path_input[i]);
+
+			QuantizeImage(numcol, images, palette, indexes);
+			uint16_t palette16[palette.size()];
+			for (const auto &pal : palette)
+				uint16_t rgb16 = RGB16(pal.a, pal.r, pal.g, pal.b);
+
+			for (int i=0; i<indexes.size(); i++)
+			{
+				uint32_t length = indexes[i].width*indexes[i].height;
+				if (bpp < 8) BitPacking(bpp, indexes[i], length);
+
+				Metadata meta;
+				meta.format = Format::Format_RGB_16;
+				meta.width = indexes[i].width;
+				meta.height = indexes[i].height;
+				meta.palette_count = numcol;
+				meta.palette_hash = murmurhash(reinterpret_cast<const char*>(palette16), sizeof(uint16_t) * palette.size(), 1);
+				meta.original_size = length;
+
+				uint8_t compress[uint64_t(meta.original_size*1.5)];
+				meta.compress_size = fastlz_compress_level(1, indexes[i].data, meta.original_size, compress);
+
+				auto output = fs::path(opt.path_output) / std::format("{}.sillyimg", fs::path(opt.path_input[i]).stem().string());
+				std::ofstream out(output, std::ios::binary);
+				
+				out.write(reinterpret_cast<const char*>(&meta), sizeof(meta));
+				out.write(reinterpret_cast<const char*>(palette16), sizeof(uint16_t) * palette.size());
+				out.write(reinterpret_cast<const char*>(compress), meta.compress_size);
+				out.close();
+			}
+		}
+
+		if (opt.format == "indexed32a3" || opt.format == "indexed8a5")
+			throw std::runtime_error("format not supported yet!");
 
-		Params params;
-		params.Parse(argc, argv);
-		params.Convert();
 	}
 	catch(const std::exception &e)
 	{
@@ -61,314 +221,16 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
+	std::cout  << "done\n";
+
 	return 0;
 }
 
-void Params::Parse(int argc, char **argv)
-{
-	argh::parser cmdl({
-		"-f", "--format",
-		"-o", "--out",
-		"-c", "--compres",
-		"-p", "--palette",
-		"-pid", "--palette-id",
-	});
-
-	cmdl.parse(argc, argv);
-
-	if (cmdl.size() == 1) PrintHelp();
-
-	verbose = cmdl[{ "-v", "--verbose" }];
-	paletteOnly = cmdl[{ "-po", "--palette-only" }];
-	cmdl({"-pid", "--palette-id"}, rand() % 256) >> paletteId;
-
-	// file input checking
-	{
-		std::stringstream ss(cmdl(1, "").str());
-		std::string token;
-
-		while (getline(ss, token, ','))
-			input_list.push_back(token);
-
-		for (auto &i : input_list)
-			if (i.empty() || !fs::exists(i)) 
-				throw std::runtime_error(std::format("file doesnt exsist: {}", i.string()));
-	}
-
-	// output directory checking
-	{
-		output_dir = cmdl({"-o", "--out"}, "").str();
-
-		if (output_dir.empty() || !fs::is_directory(output_dir))
-			throw std::runtime_error(std::format("invalid output directory: {}", output_dir.string()));
-	}
-
-	// format checking
-	{
-		std::string temp = cmdl({"-f", "--format"}, "rgb16").str();
-
-		if (temp == "rgb256" || temp == "rgb255" || temp == "rgb")
-			format = Format_RGB_256;
-
-		else if (temp == "rgb16" || temp == "rgb15")
-			format = Format_RGB_16;
-
-		else if (temp == "indexed4" || temp == "4")
-			format = Format_INDEXED_4;
-
-		else if (temp == "indexed16" || temp == "16")
-			format = Format_INDEXED_16;
-
-		else if (temp == "indexed256" || temp == "256")
-			format = Format_INDEXED_256;
-
-		else if (temp == "indexed32a3" || temp == "i5a3")
-			format = Format_INDEXED_32A3;
-
-		else if (temp == "indexed8a5" || temp == "i3a5")
-			format = Format_INDEXED_8A5;
-
-		else throw std::runtime_error(std::format("Invalid format: {}", temp));
-	}
-
-	// compress checking
-	{
-		std::string temp = cmdl({"-c", "--compress"}, "none").str();
-
-		if (temp == "none")
-			compress = Compress_NONE;
-
-		else if (temp == "lzsswram" || temp == "lzss")
-			compress = Compress_LZSS_WRAM;
-
-		else if (temp == "lzssvram")
-			compress = Compress_LZSS_VRAM;
-
-		else if (temp == "gzip")
-			compress = Compress_GZIP;
-
-		else throw std::runtime_error(std::format("Invalid compress: {}", temp));
-	}
-
-	// num check
-	{
-		cmdl({"-n", "--num"}, 0) >> limitColor;
-
-		if (limitColor > 0)
-		{
-			switch (format) {
-				case Format_RGB_256: limitColor = std::clamp(limitColor, 0, 256); break;
-				case Format_RGB_16: limitColor = std::clamp(limitColor, 0, 16); break;
-				case Format_INDEXED_4: limitColor = std::clamp(limitColor, 0, 4); break;
-				case Format_INDEXED_16: limitColor = std::clamp(limitColor, 0, 16); break;
-				case Format_INDEXED_256: limitColor = std::clamp(limitColor, 0, 256); break;
-				case Format_INDEXED_32A3: limitColor = std::clamp(limitColor, 0, 32); break;
-				case Format_INDEXED_8A5: limitColor = std::clamp(limitColor, 0, 8); break;
-				case Format_PALETTE_16: break;
-			}
-		}
-	}
-
-	Print("\n==============\n");
-	Print("input:\n");
-	for (auto &i : input_list)
-		Print(std::format("  {}\n", i.string()));
-	Print(std::format("output dir: {}\n", output_dir.string()));
-	
-	Print(std::format("format: {}\n", static_cast<int>(format)));
-	Print(std::format("compress: {}\n", static_cast<int>(compress)));
-	Print(std::format("paletteId: {}\n", static_cast<int>(paletteId)));
-	
-	if (limitColor > 0)
-		Print(std::format("limitColor: {}\n", limitColor));
-
-	Print("==============\n\n");
-}
-
-void Params::Convert()
-{
-
-	switch (format) {
-
-		case Format_RGB_256:
-		{
-			for (int i=0; i<input_list.size(); i++)
-			{
-				Image img;
-				img.Load(input_list[i]);
-
-				WriteImage(
-					(output_dir/input_list[i].stem()).string() + "_img.bin",
-					format, img.width, img.height, compress, 0,
-					img.data, img.width*img.height*4);
-			}
-
-			break;
-		}
-
-		case Format_RGB_16:
-		{
-			for (int i=0; i<input_list.size(); i++)
-			{
-				Image img;
-				img.Load(input_list[i]);
-				uint16_t *img16 = new uint16_t[img.width*img.height];
-
-				for (int i2=0; i2<img.width*img.height; i2++)
-					img16[i2*2] = RGB16(img.data[i2*4+3], img.data[i2*4+0], img.data[i2*4+1], img.data[i2*4+2]);
-
-				WriteImage(
-					output_dir / std::format("{}_img.bin", input_list[i].stem().string()),
-					format, img.width, img.height, compress, 0,
-					img16, img.width*img.height*2);
-
-				delete[] img16;
-			}
-
-			break;
-		}
-
-		// TODO: wrap indexed into function to reduce code repetition
-		case Format_INDEXED_4:
-		{
-			std::vector<Color> palette;
-			std::vector<Image> images(input_list.size());
-			std::vector<IndexedImage> indexes(input_list.size());
-
-			for (int i=0; i<images.size(); i++)
-				images[i].Load(input_list[i]);
-			
-			GetIndexed(4, images, palette, indexes);
-			WritePalette(output_dir / std::format("{}_pal.bin", paletteId), paletteId, palette);
-
-			
-			for (int i=0; i<indexes.size(); i++)
-			{
-				uint32_t length;
-				BitPacking(2, indexes[i], length);
-
-				WriteImage(
-					output_dir / std::format("{}_img.bin", input_list[i].stem().string()),
-					format, indexes[i].width, indexes[i].height, compress, paletteId,
-					indexes[i].data, length);
-			}
-
-			break;
-		}
-
-		case Format_INDEXED_16:
-		{
-			std::vector<Color> palette;
-			std::vector<Image> images(input_list.size());
-			std::vector<IndexedImage> indexes(input_list.size());
-
-			for (int i=0; i<images.size(); i++)
-				images[i].Load(input_list[i]);
-
-			GetIndexed(16, images, palette, indexes);
-			WritePalette(output_dir / std::format("{}_pal.bin", paletteId), paletteId, palette);
-
-			for (int i=0; i<indexes.size(); i++)
-			{
-				uint32_t length;
-				BitPacking(4, indexes[i], length);
-
-				WriteImage(
-					output_dir / std::format("{}_img.bin", input_list[i].stem().string()),
-					format, indexes[i].width, indexes[i].height, compress, paletteId,
-					indexes[i].data, length);
-			}
-
-			break;
-		}
-
-		case Format_INDEXED_256:
-		{
-			std::vector<Color> palette;
-			std::vector<Image> images(input_list.size());
-			std::vector<IndexedImage> indexes(input_list.size());
-
-			for (int i=0; i<images.size(); i++)
-				images[i].Load(input_list[i]);
-
-			GetIndexed(256, images, palette, indexes);
-			WritePalette(output_dir / std::format("{}_pal.bin", paletteId), paletteId, palette);
-
-			for (int i=0; i<indexes.size(); i++)
-				WriteImage(
-					output_dir / std::format("{}_img.bin", input_list[i].stem().string()),
-					format, indexes[i].width, indexes[i].height, compress, paletteId,
-					indexes[i].data, indexes[i].width*indexes[i].height);
-
-			break;
-		}
-
-		case Format_INDEXED_32A3:
-		case Format_INDEXED_8A5:
-		case Format_PALETTE_16:
-
-		throw std::runtime_error("currently not implemented yet!");
-		break;
-	}	
-}
-
-void Params::PrintHelp()
-{
-	// std::cout << "quantization <input path> [output path]" << "\n\n";
-}
-
-void Params::Print(const std::string &msg)
-{
-	if (verbose) std::cout << msg;
-}
-
-// ----
-
-void WritePalette(const std::string &path, const uint8_t paletteId, std::vector<Color> &palette)
-{
-	Metadata meta;
-
-	meta.format = Format_PALETTE_16;
-	meta.paletteId = paletteId;
-	meta.width = palette.size();
-	meta.height = palette.size();
-	meta.compression = Compress_NONE;
-	meta.length = palette.size()*2;
-
-	std::ofstream out(path, std::ios::binary);
-	out.write(reinterpret_cast<const char*>(&meta), sizeof(meta));
-
-	for (const auto &i : palette)
-	{
-		uint16_t rgb16 = RGB16(i.a, i.r, i.g, i.b);
-		out.write(reinterpret_cast<const char*>(&rgb16), sizeof(rgb16));
-	}
-
-	out.close();
-}
-
-void WriteImage(const std::string &path, const Format &format, const uint16_t width, const uint16_t height, const Compress &compress, const uint8_t paletteId, void *buffer, const uint32_t length)
-{
-	Metadata meta;
-
-	meta.format = format;
-	meta.paletteId = paletteId;
-	meta.width = width;
-	meta.height = height;
-	meta.compression = Compress_NONE;
-	meta.length = length;
-
-	std::ofstream out(path, std::ios::binary);
-	out.write(reinterpret_cast<const char*>(&meta), sizeof(meta));
-	out.write(reinterpret_cast<const char*>(buffer), length);
-	out.close();
-}
-
-
-// ----
+// // ----
 
 uint16_t RGB16(uint8_t a, uint8_t r, uint8_t g, uint8_t b)
 {
+	// TODO: alpha threshold
 	uint16_t a1 = a & 0x01;
 	uint16_t r5 = (r >> 3) & 0x1F;
 	uint16_t g5 = (g >> 3) & 0x1F;
@@ -377,7 +239,7 @@ uint16_t RGB16(uint8_t a, uint8_t r, uint8_t g, uint8_t b)
 	return (a1 << 15) | (r5) | (g5 << 5) | (b5 << 10);
 }
 
-void GetIndexed(const int numColor, std::vector<Image> &images, std::vector<Color> &palette, std::vector<IndexedImage> &indexes)
+void QuantizeImage(const int numColor, std::vector<Image> &images, std::vector<Color> &palette, std::vector<IndexedImage> &indexes)
 {
 	liq_attr *liq_attr;
 	liq_result *liq_result;
@@ -420,6 +282,7 @@ void GetIndexed(const int numColor, std::vector<Image> &images, std::vector<Colo
 
 	for (auto &i : liq_images)
 		liq_image_destroy(i);
+
 	liq_attr_destroy(liq_attr);
 	liq_histogram_destroy(liq_histogram);
 	liq_result_destroy(liq_result);
@@ -448,7 +311,7 @@ void BitPacking(const uint8_t bpp, IndexedImage &img, uint32_t &length)
 	img.data = buffer;
 }
 
-// ----
+// // ----
 
 Image::Image(const std::filesystem::path &path)
 {
@@ -466,7 +329,7 @@ void Image::Load(const std::filesystem::path &path)
 	if (data == nullptr) throw std::runtime_error(stbi_failure_reason());
 }
 
-// ----
+// // ----
 
 IndexedImage::IndexedImage(int width, int height)
 	: width(width), height(height), data(nullptr)