MB86296 Datasheet, PDF (72/352 Pages) Fujitsu Component Limited. – PCI Graphics Controller Specification

FUJITSU LIMITED PRELIMINARY AND CONFIDENTIAL
7.2.2 Overlay
(1) Overview
Image data for the six layers (L0 to L5) is processed as shown below.
L0(C) data
Cursor0 data
Cursor1 data
L1(W) data
L2(ML) data
L3(MR) data
L4(BL) data
L5(BR) data
L2 data
L3 data
L4 data
L5 data
Pallet-0
Pallet-1
YUV/RGB
Pallet-2
Pallet-3
The fundamental flow is: Palette → Layer selection → Blending. The palettes convert 8-bit color
codes to the RGB format. The layer selector exchanges the layer overlay sequence arbitrarily.
The blender performs blending using the blend coefficient defined for each layer or overlays in
accordance with the transparent-color definition.
The L0 layer corresponds to the C layer for previous products and shares the palettes with the
cursor. As a result, the L0 layer and cursor are overlaid before blend operation.
The L1 layer corresponds to the W layer for previous products. To implement backward
compatibility with previous products, the L1 layer and lower layers are overlaid before blend
operation.
The L2 to L5 layers have two paths; in one path, these layers are input to the blender separately
and in the other, these layers and the L1 layer are overlaid and then are input to the blender.
When performing processing using the extended mode, select the former; when performing the
same processing as previous products, select the latter. It is possible to specify which one to
select for each layer.
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Specification Manual Rev0.1