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For command byte values 0 - 3, the two <# of bytes/rows>
bytes specify the number of bytes (row length) for the row.
For command byte values 4 and 5, these bytes identify the
number of empty or duplicate rows to print. The maximum
value for these two bytes is 65,535; however, the image is
clipped to the logical page. Thus, the value of these bytes
should not exceed the maximum number of bytes/rows that
can be printed on the current logical page size.
If an out-of-range command byte is encountered, the
remainder of the block is skipped, the cursor is not updated,
and the seed row is cleared.
Compression methods 0 - 3 are the compression methods
used by the Set Compression Method command. Value
fields 4 and 5 are features for the adaptive compression
method and are explained below.
Empty Row
A command byte of 4, empty row, causes a row of zero’s to
be printed. The number of rows printed depends on the
value contained in the two <# of bytes/rows> bytes
following the command byte. The empty row operation
resets the seed row to zero and updates the cursor position.
Duplicate Row
A command byte of 5, duplicate row, causes the previous
row to be printed again. The row can be duplicated the
number of times indicated by the value contained in the
<# of bytes/row> byte. Duplicate Row updates the cursor
position but does not change the seed row.
6-32 Raster Graphics6-32 Raster Graphics