Window Blending; Overview - Samsung S3C2416 User Manual

LCD CONTROLLER

3 WINDOW BLENDING

3.1 OVERVIEW

The main function of the VPRCS module is window blending. LCD controller has 2-window layers and the detail is
described below. As an example of application, System can use win0 as an OS window, full TV screen window or
etc. This feature enhances the system performance by reducing the data rate of total system.
3.1.1 Total 2 windows
Window 0 (base)
Window 1 (overlay) : RGB with palette
3.1.2 Overlay Priority
Win 1 > Win 0
3.1.3 Blending equation
WinOut(R) = Win0(R) x (1-AR) + Win1(R) x AR
WinOut(G) = Win0(G) x (1-AG) + Win1(G) x AG
WinOut(B) = Win0(B) x (1-AB) + Win1(B) x AB
Where,
AR = Win1's Red blending factor(ALPHA0_R/16 or ALPHA1_R/16 or DATA[27:24]/16, AR range is 0~1)
AG = Win1's Green blending factor(ALPHA0_G/16 or ALPHA1_G/16 or DATA[27:24]/16, AG range is 0~1)
AB = Win1's Blue blending factor(ALPHA0_B/16 or ALPHA1_B/16 or DATA[27:24]/16, AB range is 0~1)
21-22
: RGB with palette
Figure 21-5. Blending Operations
S3C2416X RISC MICROPROCESSOR