Research

tools/vertical_strip_crops.py

@@ -0,0 +1,57 @@
+import struct, zlib, os
+IN_BIN = r"K:\ghidra\Crusader_Decomp\binary\Crusader - No Remorse Memdump Weapons.bin"
+OUT_DIR = r"K:\ghidra\Crusader_Decomp\binary\vstrip_crops"
+W,H = 1024,512
+x0 = 956
+x1 = 1023
+w = x1 - x0 + 1
+step_h = 48
+import math
+os.makedirs(OUT_DIR, exist_ok=True)
+with open(IN_BIN,'rb') as f:
+    data = f.read()
+count = min(len(data)//2, W*H)
+# build full RGB 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))
+# produce crops
+import struct, zlib
+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
+for i in range(0, H, step_h):
+    y0 = i
+    y1 = min(H-1, i+step_h-1)
+    h = y1 - y0 + 1
+    rawrows = []
+    for y in range(y0, y1+1):
+        rawrows.append(b"\x00" + rows[y][x0*3:(x0+w)*3])
+    raw = b"".join(rawrows)
+    comp = zlib.compress(raw,9)
+    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'')
+    out = os.path.join(OUT_DIR, f'vstrip_{y0:03d}_{y1:03d}.png')
+    with open(out,'wb') as f:
+        f.write(png)
+    start_idx = y0*W + x0
+    end_idx = y1*W + x1
+    so = start_idx*2
+    eo = (end_idx+1)*2 -1
+    print(out, f'box=({x0},{y0})-({x1},{y1}) bytes=0x{so:06x}-0x{eo:06x}')