Function _chunk

tests/integration/test_image_view.py:132–134

(tag: bytes, data: bytes)

    """1×1 white PNG."""

    def _chunk(tag: bytes, data: bytes) -> bytes:
        crc = zlib.crc32(tag + data) & 0xFFFFFFFF
        return struct.pack(">I", len(data)) + tag + data + struct.pack(">I", crc)

    sig = b"\x89PNG\r\n\x1a\n"
    ihdr_data = struct.pack(">IIBBBBB", 1, 1, 8, 2, 0, 0, 0)  # 1×1 RGB8