Research

tools/vram_to_png.py

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+import struct, zlib
+IN_PATH = r"K:\ghidra\Crusader_Decomp\binary\Crusader - No Remorse Memdump Weapons.bin"
+OUT_PATH = r"K:\ghidra\Crusader_Decomp\binary\vram_weapons.png"
+W, H = 1024, 512
+with open(IN_PATH, 'rb') as f:
+    data = f.read()
+exp = W * H * 2
+if len(data) < exp:
+    print(f"Warning: expected {exp} bytes, got {len(data)} bytes")
+count = min(len(data) // 2, W * H)
+# build raw RGB rows top-to-bottom
+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(b"\x00" + bytes(row))
+raw = b"".join(rows)
+comp = zlib.compress(raw, level=9)
+# PNG helpers
+def chunk(ch_type, data):
+    out = struct.pack('>I', len(data)) + ch_type + data
+    import zlib
+    crc = zlib.crc32(ch_type + data) & 0xffffffff
+    out += struct.pack('>I', crc)
+    return out
+png = b"\x89PNG\r\n\x1a\n"
+# IHDR
+ihdr = struct.pack('>IIBBBBB', W, H, 8, 2, 0, 0, 0)  # 8-bit, truecolor, no interlace
+png += chunk(b'IHDR', ihdr)
+# IDAT
+png += chunk(b'IDAT', comp)
+# IEND
+png += chunk(b'IEND', b'')
+with open(OUT_PATH, 'wb') as f:
+    f.write(png)
+print('Wrote', OUT_PATH, 'size=', len(png))