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Opcode — Specifies the logical operations performed on
a source, destination, and pattern prior to drawing the
final image. These raster opcodes (ROPs) are listed on
the following pages in reverse polish notation (RPN)
using the following abbreviations:
D — Destination
S — Source
T — Texture
a — and
n — not
o — or
x — exclusive or
For example, when mode = 0, the opcode default is 252,
which is the logical function TSo (Texture OR Source).
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 constructed
by reading the output values bottom up.
Pixel Combinations Desired Destination Values
Pattern Pixel Source Pixel Destination
Pixel
Source
Overwrite
Transparency
(TR command)
Source
Destination
000000
001011
010111
011110
100000
101011
110111
111110
Resulting Opcode 204 (0xCC) 238 (0xEE) 102 (0x66)
Color Vector Graphics (HP-GL/2) 7-7Color Vector Graphics (HP-GL/2) 7-7