Allwinner A20 - 5.4. Display Engine Backend

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 528 / 812
5.4. Display Engine Backend
5.4.1. Overview
The display engine backend features:
 4 moveable and size-adjustable layers
 Layer size up to 8192x8192 pixels
 Alpha blending support
 Color key support
 Write back function support
 1/2/4/8 bpp mono / palette support
 16/24/32 bpp color support (external frame buffer)
- 5/6/5
- 1/5/5/5
- 0/8/8/8
- 8/8/8
- 8/8/8/8
- 4/4/4/4
 On chip SRAM support
- 256 entry 32-bpp palette
- 1/2/4/8 bpp internal frame buffer
- Gamma correction support
 Hardware cursor support
- 32x32 @8bpp
- 64x64 @2bpp
- 64x32 @4bpp
- 32x64 @4bpp
 Sprite function support
- 32bpp true color or 8bpp palette mode
- up to 32 independent sprite blocks
- each block can be set arbitrary coordinate
- adjustable block size
 YUV input channel support
 Vertical keystone correction
 Output color correction