IN_BIN = r"K:\ghidra\Crusader_Decomp\binary\Crusader - No Remorse Memdump Weapons.bin"
W,H = 1024,512
TOP, BOT = 44, 92  # y range (inclusive start, exclusive end)
import os
with open(IN_BIN,'rb') as f:
    data = f.read()
count = min(len(data)//2, W*H)
# build mask for this row range
col_counts = [0]*W
for y in range(TOP, BOT):
    for x in range(W):
        i = y*W + x
        if i < count:
            off = i*2
            val = data[off] | (data[off+1]<<8)
            if val & 0x7fff:
                col_counts[x] += 1
# find runs where col_counts exceeds threshold
maxc = max(col_counts)
thr = max(3, int(maxc*0.2))
runs = []
inside=False
for x,c in enumerate(col_counts):
    if c>thr and not inside:
        sx = x; inside=True
    if c<=thr and inside:
        ex = x-1; inside=False; runs.append((sx,ex))
if inside: runs.append((sx,W-1))
print('max per-col count', maxc, 'threshold', thr)
print('runs:', runs)
# compute byte offsets and produce crops (no PIL)
import struct, zlib
OUT_DIR = r"K:\ghidra\Crusader_Decomp\binary\hud_candidates"
os.makedirs(OUT_DIR, exist_ok=True)
with open(IN_BIN,'rb') as f:
    bin_data = f.read()
# build full rows RGB
rows = []
for y in range(H):
    row = bytearray()
    for x in range(W):
        i = y*W + x
        if i < count:
            off = i*2
            val = bin_data[off] | (bin_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))
# for each run, create a crop with padding
for i,(sx,ex) in enumerate(runs):
    pad = 8
    x0 = max(0, sx-pad)
    x1 = min(W-1, ex+pad)
    y0 = TOP; y1 = BOT-1
    w = x1 - x0 + 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)
    def chunk(t,d):
        out = struct.pack('>I', len(d)) + t + d
        import zlib
        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'')
    out = os.path.join(OUT_DIR, f'cand_{i}_{x0}_{y0}.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(f'wrote {out} box=({x0},{y0})-({x1},{y1}) bytes=0x{so:06x}-0x{eo:06x} col_counts_max={max(col_counts[x0:x1+1])}')

# also print top columns with counts
top_cols = sorted(((c,x) for x,c in enumerate(col_counts)), reverse=True)[:30]
print('\nTop columns (count,x):')
for c,x in top_cols:
    print(c,x)