Add scad_format for CGX, COL, OBJ files

src/app/gfx/scad_format.h

@@ -0,0 +1,71 @@
+#ifndef YAZE_APP_GFX_scad_format_H
+#define YAZE_APP_GFX_scad_format_H
+
+#include <SDL.h>
+
+#include <cmath>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "app/core/constants.h"
+
+namespace yaze {
+namespace app {
+namespace gfx {
+
+// Address       Description
+// 00000 - 00003 File type "SCH"
+// 00004 - 00008 Bit mode "?BIT"
+// 00009 - 00013 Version number "Ver-????\n"
+// 00014 - 00017 Header size
+// 00018 - 0001B Hardware name "SFC" or "CGB" or "GB"
+// 0001C - 0001C BG/OBJ flag (for AGB)
+// 0001D - 0001D Color Pallette Number
+// 0001D - 000FF Reserved
+// 00100 - 001FF Color Path
+struct CgxHeader {
+  char file_type[4];
+  char bit_mode[5];
+  char version_number[9];
+  uint32_t header_size;
+  char hardware_name[4];
+  uint8_t bg_obj_flag;
+  uint8_t color_palette_number;
+  uint8_t reserved[0xE3];
+  uint8_t color_path[0x100];
+};
+
+CgxHeader ExtractCgxHeader(std::vector<uint8_t>& cgx_header);
+
+absl::Status DecodeCgxFile(std::string_view filename,
+                           std::vector<uint8_t>& cgx_data,
+                           std::vector<uint8_t>& extra_cgx_data,
+                           std::vector<uint8_t>& decoded_cgx);
+
+std::vector<SDL_Color> DecodeColFile(const std::string& filename);
+
+absl::Status DecodeObjFile(
+    std::string_view filename, std::vector<uint8_t>& obj_data,
+    std::vector<uint8_t> actual_obj_data,
+    std::unordered_map<std::string, std::vector<uint8_t>> decoded_obj,
+    std::vector<uint8_t>& decoded_extra_obj, int& obj_loaded);
+
+SDL_Surface* CreateCgxPreviewImage(int default_cgram,
+                                   const std::vector<uint8_t>& cgx_data,
+                                   const std::vector<uint8_t>& extra_cgx_data,
+                                   std::vector<SDL_Color> decoded_col);
+
+}  // namespace gfx
+}  // namespace app
+}  // namespace yaze
+
+#endif  // YAZE_APP_GFX_scad_format_H