SECTION 10.5
853
Marked Content
object (in this case, a filled path). Each line of text is bracketed within a separate
marked clipping sequence, tagged
Pgf
. The entire series is bracketed in turn by an
outer marked clipping sequence, tagged
Clip
. Note, however, that the marked-
content sequence tagged
ClippedText
is
not
a marked clipping sequence, since it
contains a filled rectangular path that is not a clipping object. The clipping
objects belonging to the
Clip
and
Pgf
sequences are therefore not considered part
of the
ClippedText
sequence.
Example 10.3
/ClippedText BMC
/Clip << … >>
BDC
BT
7 Tr
/Pgf BMC
( Line 1 ) Tj
EMC
/Pgf BMC
( Line ) '
( 2 ) Tj
EMC
ET
EMC
100 100 10 10 re f
EMC
% Begin text clip mode
% Set current text clip
% Filled path
The precise rules governing marked clipping sequences are as follows:
•
A
clipping object
is a path object ended by the operator sequence
W n
or
W* n
or
a text object painted in text rendering mode 7.
•
An
invisible graphics object
is a path object ended by the operator
n
only (with
no preceding
W
or
W*
) or a text object painted in text rendering mode 3.
•
A
visible graphics object
is a path object ended by any operator other than
n
, a
text object painted in any text rendering mode other than 3 or 7, or any
XObject invoked by the
Do
operator.
•
An
empty marked-content element
is a marked-content point or a marked-
content sequence that encloses no graphics objects.