MB86290A Datasheet, PDF (17/184 Pages) Fujitsu Component Limited. – Graphics Controller Hardware Specifications

1.5.6 Special Effects
A nt i -al i asi ng
Anti-aliasing manipulates lines and borders of polygons in sub-pixel units to
eliminate jaggies on bias lines. It is used as a functional option for 2D
drawing (in direct color mode only).
Line drawing
This function draws lines of a specific width. Detecting a line pattern can
also draw a broken line. The anti-aliasing feature is also useful to draw
smooth lines.
Line Draw Attributes
Attribute
Width
Broken line
Description
Selectable from 1 to 32 pixels
Set by 32 bit of broken line pattern
Alpha blending
Alpha blending blends two separate colors to provide a transparency effect.
MB86290A supports two types of alpha blending; blending two different
colors at drawing, and blending overlay planes at display. Transparent color
is not used for these blending options.
Alpha Blending
Type
Drawing
Overlay display
Description
- Transparent ratio set in particular register
- While one primitive (polygon, pattern, etc.),
being drawn, registered transparent ratio applied
- Blends top layer pixel color and lower layer pixel at
same position
- Transparent ratio set in particular register
- Registered transparent ratio applied during one frame
scan
Shading
Gouraud shading is supported in the direct color mode to provide realistic 3D
objects and color gradation.
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