HP 4 FAMILY User Manual
Page 66
Note
When using the MC command, some pattern types will not
produce the expected ROP result. This only occurs when
using the FT (Fill Type) command pattern types 1, 2, 3, and
4, and the ROP includes an XOR operation. (This problem
is due to the fact that these patterns are the result of a
vector operation and do not produce raster data for use by a
ROP operation.) All other Fill Type command patterns
(types, 10, 11, 21, or 22) operate as expected.
opcode
The operation code (opcode) specifies the logical operations
that are performed on a source, destination, and patterned
image prior to drawing the final image. The opcodes are
created by listing all possible combinations of a single
pattern, source and destination pixel, and constructing the
desired final pixel values. The following table shows three
common opcodes (also see Table 2-6).
Pixel Combinations
Desired Destination Values
Pattern Pixel Source Pixel
Destination
Pixel
Source
Overwrite
Transparency
(TR
command)
Source
Destination
0
0
0
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
0
1
1
1
1
0
1
0
0
0
0
0
1
0
1
0
1
1
1
1
0
1
1
1
1
1
1
1
1
0
Resulting Opcode
204 (0xCC)
238 (0xEE)
102 (0x66)
Table 2-7.
Common Opcodes
2-30 Printer-Specific Differences