add save gfx groups

src/app/rom.cc

@@ -257,6 +257,10 @@ absl::Status Rom::SaveToFile(bool backup, bool save_new, std::string filename) {
     RETURN_IF_ERROR(SaveAllPalettes());
   }
 
+  if (flags()->kSaveGfxGroups) {
+    SaveGroupsToRom();
+  }
+
   if (save_new) {
     // Create a file of the same name and append the date between the filename
     // and file extension
@@ -335,6 +339,39 @@ absl::Status Rom::SaveAllPalettes() {
   return absl::OkStatus();
 }
 
+void Rom::SaveGroupsToRom() {
+  int gfxPointer =
+      (rom_data_[kGfxGroupsPointer + 1] << 8) + rom_data_[kGfxGroupsPointer];
+  gfxPointer = core::SnesToPc(gfxPointer);
+
+  for (int i = 0; i < 37; i++) {
+    for (int j = 0; j < 8; j++) {
+      rom_data_[gfxPointer + (i * 8) + j] = main_blockset_ids[i][j];
+    }
+  }
+
+  for (int i = 0; i < 82; i++) {
+    for (int j = 0; j < 4; j++) {
+      rom_data_[core::entrance_gfx_group + (i * 4) + j] =
+          room_blockset_ids[i][j];
+    }
+  }
+
+  for (int i = 0; i < 144; i++) {
+    for (int j = 0; j < 4; j++) {
+      rom_data_[version_constants().kSpriteBlocksetPointer + (i * 4) + j] =
+          spriteset_ids[i][j];
+    }
+  }
+
+  for (int i = 0; i < 72; i++) {
+    for (int j = 0; j < 4; j++) {
+      rom_data_[version_constants().kDungeonPalettesGroups + (i * 4) + j] =
+          paletteset_ids[i][j];
+    }
+  }
+}
+
 std::shared_ptr<Rom> SharedRom::shared_rom_ = nullptr;
 
 }  // namespace app