#
# PER-HEAD A/B scoreboard for the packed gauge framebuffer.
#
# L4GAUGE.CFG configures ten logical ports onto ONE 640x480x16 buffer, each
# port owning a BIT MASK, not a rectangle -- the VDB later splits the planes
# into the pod's separate physical heads.  Comparing RGB is therefore
# meaningless; the only useful question is "which HEAD differs, and where".
#
# DOSBox presents the buffer as RGB565 with bit replication, so the original
# 16-bit word is recovered exactly by R>>3, G>>2, B>>3.
#
import sys
from PIL import Image

BOX = (8, 52, 648, 531)

PORTS = [
    ("sec",     0x003F),   # the 3-D scene (6-bit colour)
    ("overlay", 0x00C0),
    ("Mfd1",    0x0100), ("Eng1", 0x0200),
    ("Mfd2",    0x0400), ("Eng2", 0x0800),
    ("Mfd3",    0x1000), ("Eng3", 0x2000),
    ("Heat",    0x4000), ("Comm", 0x8000),
]


def words(path):
    im = Image.open(path).convert("RGB").crop(BOX)
    w, h = im.size
    px = im.load()
    out = []
    for y in range(h):
        row = []
        for x in range(w):
            r, g, b = px[x, y]
            row.append(((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3))
        out.append(row)
    return out, w, h


def main(ship_path, ours_path):
    A, w, h = words(ship_path)
    B, w2, h2 = words(ours_path)
    if (w, h) != (w2, h2):
        print("SIZE MISMATCH")
        return

    print("%-8s %8s %8s %8s %8s   %s" %
          ("head", "shipped", "ours", "missing", "extra", "extra-bbox"))
    for name, mask in PORTS:
        sa = so = both = 0
        xs = []
        ys = []
        for y in range(h):
            ra, rb = A[y], B[y]
            for x in range(w):
                a = (ra[x] & mask) != 0
                b = (rb[x] & mask) != 0
                if a:
                    sa += 1
                if b:
                    so += 1
                if a and b:
                    both += 1
                if b and not a:
                    xs.append(x)
                    ys.append(y)
        bbox = ("(%d,%d)-(%d,%d)" % (min(xs), min(ys), max(xs), max(ys))
                if xs else "-")
        print("%-8s %8d %8d %8d %8d   %s" %
              (name, sa, so, sa - both, so - both, bbox))


main(sys.argv[1], sys.argv[2])