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For Method 2—if row length is equal to one, the one byte
is consumed from the I/O and the cursor is incremented.
The data is ignored and the seed row is zeroed.
For Method 3—delta row compression, within an
adaptive compression block, the seed row is updated by
every raster compression method or type of row. For
example, a row compressed with Method 2, TIFF,
updates the seed row, while the effect of an empty row
initializes the seed row to zeros. Maintaining the seed
row allows Method 3 to be mixed with other methods to
achieve optimal compression performance.
For Method 3—since delta row compression requires that
the seed row be available whenever raster graphics mode
is entered, the seed row is initialized to zeros upon raster
graphics mode entry (?*r#A). The seed row is also
initialized upon receipt and completion of each raster
block.
For Method 3—if the row length terminates the data
before the control byte value is satisfied (literal byte
count greater than row length), the data following the
control byte, if any, is printed as text. The cursor is
incremented.
For Method 3—if the row length is equal to one, the
current row is duplicated and the cursor is incremented.
6-34 Raster Graphics6-34 Raster Graphics