Find all individual instances of images drawn in the container

    Usually the container is a page, but it may also be a Form XObject.

    On a typical page images are stored inline or as regular images
    in an XObject.

    Form XObjects may include inline images, XObject images,
    and recursively, other Form XObjects; and also vector graphic objects.

    Every instance of an image being drawn somewhere is flattened and
    treated as a unique image, since if the same image is drawn multiple times
    on one page it may be drawn at differing resolutions, and our objective
    is to find the resolution at which the page can be rastered without
    downsampling.

def _process_content_streams(*, pdf, container, shorthand=None):
    """Find all individual instances of images drawn in the container

    Usually the container is a page, but it may also be a Form XObject.

    On a typical page images are stored inline or as regular images
    in an XObject.

    Form XObjects may include inline images, XObject images,
    and recursively, other Form XObjects; and also vector graphic objects.

    Every instance of an image being drawn somewhere is flattened and
    treated as a unique image, since if the same image is drawn multiple times
    on one page it may be drawn at differing resolutions, and our objective
    is to find the resolution at which the page can be rastered without
    downsampling.

    """

    if container.get('/Type') == '/Page' and '/Contents' in container:
        initial_shorthand = shorthand or UNIT_SQUARE
    elif container.get('/Type') == '/XObject' and container['/Subtype'] == '/Form':
        # Set the CTM to the state it was when the "Do" operator was
        # encountered that is drawing this instance of the Form XObject
        ctm = PdfMatrix(shorthand) if shorthand else PdfMatrix.identity()

        # A Form XObject may provide its own matrix to map form space into
        # user space. Get this if one exists
        form_shorthand = container.get('/Matrix', PdfMatrix.identity())
        form_matrix = PdfMatrix(form_shorthand)

        # Concatenate form matrix with CTM to ensure CTM is correct for
        # drawing this instance of the XObject
        ctm = form_matrix @ ctm
        initial_shorthand = ctm.shorthand
    else:
        return

    contentsinfo = _interpret_contents(container, initial_shorthand)

    if contentsinfo.found_vector:
        yield VectorInfo()
    yield from _find_inline_images(contentsinfo)
    yield from _find_regular_images(container, contentsinfo)
    yield from _find_form_xobject_images(pdf, container, contentsinfo)