MB86290A Datasheet, PDF (63/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

6.2.3 Drawing Parameters
MB86290A differentiates triangles (Right triangle and Left triangle) according
to the locations of three vertices as follows (not used for Fast2Dtriangle):
V0
L o n g s id e
U pper side
U pp er trian g le
V1
U pper side
U pp er trian g le
V1
V0
L o n g s id e
Low er side
V2
L ow e r tria n gle
Low er side
V2
L ow e r tria n gle
R ig ht tria ngle
L eft trian g le
The following parameters are required for drawing triangles (For
Fast2Dtriangle, X and Y coordinates of each vertex are specified).
Ys Xs,Zs,Rs,Gs,Bs,Ss,Ts,Qs
XUs
dXdy
d Zd y
dRdy
dGdy
dBdy
dSdy
dTdy
dQdy
dXUdy
dZdx,dRdx,dGdx,dB dx,
dS dx,dTdx,dQ dx
dXLdy
XLs
Upper side start
Y coordinate
USN
Low er side start
Y coordinate
LSN
Note: Be careful about the positional relationship between coordinates Xs,
XUs, and XLs.
For example, in the above diagram, when a right-hand triangle is
drawn using the parameter that shows the coordinates positional
relationship Xs (upper edge start Y coordinate) > XUs or Xs (lower
edge start Y coordinate) > XLs, the expected picture may not be
drawn.
63