Add tileset post processing

tools/asset_extractor/asset_extractor.py

@@ -1,6 +1,13 @@
 from pathlib import Path
 import os
 import sys
+import subprocess
+import parser
+
+# Allow to parse expressions instead of just hex numbers to be able to quickly adapt offsets for different versions
+def parse_hex(text):
+    code = parser.expr(text).compile()
+    return eval(code)
 
 def extract_assets(variant):
     print(f'Extract assets from {variant}.')
@@ -16,16 +23,37 @@ def extract_assets(variant):
 
     with open(f'assets_{variant}.csv', 'r') as file:
         for line in file:
-            (path,start,size,_) = line.split(',')
+            (path,start,size,mode) = line.split(',')
+            mode = mode.strip()
+            start = parse_hex(start)
+            size = parse_hex(size)
+
             if os.path.isfile(path):
                print(f'{path} already extracted.') 
             else:
                 print(f'Extracting {path}...')
                 Path(os.path.dirname(path)).mkdir(parents=True, exist_ok=True)
                 with open(path, 'wb') as output:
-                    output.write(baserom[int(start,16):int(start,16)+int(size,16)])
+                    output.write(baserom[start:start+size])
+                if mode == 'tileset':
+                    extract_tileset(path)
+
+
+def run_gbagfx(path_in: str, path_out:str, options: list[str]) -> None:
+    subprocess.check_call([os.path.join('tools', 'gbagfx', 'gbagfx'), path_in, path_out] + options)
+
+def extract_tileset(path):
+    assert(path.endswith('.4bpp.lz'))
+    base = path[0:-8]
+    print(base)
+    subprocess.call(['cp', path, path+'.bkp'])
+    run_gbagfx(path, base+'.4bpp', []) # decompress
+    run_gbagfx(base+'.4bpp', base+'.png', ['-mwidth', '32']) # convert to png
+    # TODO automatically generate tileset entries from tileset_headers.s
+    # TODO Possible to set the correct palette? Or not, because there is a set of palettes that can be chosen and the correct palette is only defined by the metatile?
+
+
 def main():
-    
     if len(sys.argv) == 1:
         extract_assets('USA')
     elif len(sys.argv) == 2: