Research

tools/make_crop_no_pil.py

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+import struct, zlib, os
+IN_BIN = r"K:\ghidra\Crusader_Decomp\binary\Crusader - No Remorse Memdump Weapons.bin"
+OUT_PNG = r"K:\ghidra\Crusader_Decomp\binary\crop_weapon_row_nopil.png"
+W,H = 1024,512
+# box: left,top,right,bot (exclusive right/bot matching PIL convention)
+left,top,right,bot = 80,44,360,92
+w = right - left
+h = bot - top
+with open(IN_BIN,'rb') as f:
+    data = f.read()
+count = min(len(data)//2, W*H)
+# build rows
+rows = []
+for y in range(H):
+    row = bytearray()
+    for x in range(W):
+        i = y*W + x
+        if i < count:
+            off = i*2
+            val = data[off] | (data[off+1]<<8)
+            b = (val & 0x1F) << 3
+            g = ((val >>5) & 0x1F) << 3
+            r = ((val >>10) & 0x1F) << 3
+        else:
+            r=g=b=0
+        row.extend([r,g,b])
+    rows.append(bytes(row))
+# compose crop raw (PNG filter 0 per row)
+rawrows = []
+for y in range(top, top+h):
+    rawrows.append(b"\x00" + rows[y][left*3:(left+w)*3])
+raw = b"".join(rawrows)
+comp = zlib.compress(raw, level=9)
+def chunk(t,d):
+    out = struct.pack('>I', len(d)) + t + d
+    crc = zlib.crc32(t + d) & 0xffffffff
+    out += struct.pack('>I', crc)
+    return out
+png = b"\x89PNG\r\n\x1a\n"
+png += chunk(b'IHDR', struct.pack('>IIBBBBB', w, h, 8, 2, 0, 0, 0))
+png += chunk(b'IDAT', comp)
+png += chunk(b'IEND', b'')
+with open(OUT_PNG, 'wb') as f:
+    f.write(png)
+# compute file offsets
+start_idx = top*W + left
+end_idx = (top+h-1)*W + (left + w -1)
+so = start_idx * 2
+eo = ((end_idx)+1)*2 -1
+print('wrote', OUT_PNG)
+print(f'pixel box=({left},{top})-({left+w-1},{top+h-1}) size={w}x{h}')
+print(f'vram byte offsets: 0x{so:06x}-0x{eo:06x} (inclusive)')