Function product

tests/test_pixmap.py:182–185

(x, y)

        pix.save(path_out)
        print(f'{pix.width=} {pix.height=}')
        def product(x, y):
            for yy in y:
                for xx in x:
                    yield (xx, yy)
        n = 0
        # We use a small subset of the image because non-optimised build gets
        # very slow.