60 lines
2.1 KiB
Python
60 lines
2.1 KiB
Python
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import struct, zlib, os
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IN_BIN = r"K:\ghidra\Crusader_Decomp\binary\Crusader - No Remorse Memdump Weapons.bin"
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IN_PNG = r"K:\ghidra\Crusader_Decomp\binary\vram_weapons.png"
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W,H = 1024,512
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# simple PNG crop writer: read full PNG rows from our previous generated PNG file
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# read raw image bytes (we will load via simple approach using original binary->RGB conversion again)
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with open(IN_BIN,'rb') as f:
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data = f.read()
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count = min(len(data)//2, W*H)
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# make full RGB array
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rows = []
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for y in range(H):
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row = bytearray()
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for x in range(W):
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i = y*W + x
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if i < count:
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off = i*2
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val = data[off] | (data[off+1]<<8)
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b = (val & 0x1F) << 3
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g = ((val >>5) & 0x1F) << 3
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r = ((val >>10) & 0x1F) << 3
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else:
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r=g=b=0
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row.extend([r,g,b])
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rows.append(bytes(row))
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# crop grid params
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xs = list(range(0, W, 128))
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ys = list(range(0, 192, 64))
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out_dir = r"K:\ghidra\Crusader_Decomp\binary\crops_grid"
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os.makedirs(out_dir, exist_ok=True)
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import zlib, struct
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for y0 in ys:
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for x0 in xs:
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w = min(256, W-x0)
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h = min(128, H-y0)
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# build raw rows top-to-bottom
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rawrows = []
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for y in range(y0, y0+h):
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rawrows.append(b"\x00" + rows[y][x0*3:(x0+w)*3])
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raw = b"".join(rawrows)
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comp = zlib.compress(raw, level=9)
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def chunk(t,d):
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out = struct.pack('>I', len(d)) + t + d
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import zlib
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crc = zlib.crc32(t + d) & 0xffffffff
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out += struct.pack('>I', crc)
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return out
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png = b"\x89PNG\r\n\x1a\n"
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png += chunk(b'IHDR', struct.pack('>IIBBBBB', w, h, 8, 2, 0, 0, 0))
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png += chunk(b'IDAT', comp)
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png += chunk(b'IEND', b'')
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out = os.path.join(out_dir, f'crop_{x0}_{y0}.png')
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with open(out,'wb') as f:
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f.write(png)
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# compute file-offset range
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start_idx = y0*W + x0
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end_idx = (y0+h-1)*W + (x0+w-1)
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so = start_idx*2
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eo = (end_idx+1)*2 -1
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print(out, f'box=({x0},{y0})-({x0+w-1},{y0+h-1}) bytes=0x{so:06x}-0x{eo:06x}')
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