S3C2416X RISC MICROPROCESSOR
LCD
CONTROLLER
21-23
3.2 BLENDING DIAGRAM/DETAILS
LCD controller could blend 2-Layer for the only one pixel at the same time. The Blending factor, alpha value is
controlled by ALPHA0_R/G/B and ALPHA1_R/G/B fields in Window 1 Alpha Value register or DATA[27:24] in
frame buffer, which are implemented for each window layer and color(R,G,B). As a special feature, between two
windows have two kinds of alpha blending value. One is ALPHA0_R/G/B(AEN=0) and the other is
ALPHA1_R/G/B(AEN=1).
Table 21-4. Alpha Value Selection Table for Blending
ALPHA_SEL = 0
@WINCON1[1]
ALPHA0_R/G/B
BLD_PIX = 0
(WINCON1[6])
ALPHA_SEL = 1
@WINCON1[1]
ALPHA1_R/G/B
AEN = 0
ALPHA0_R/G/B
KEYBLEND = 0
@W1KEYCON0[26]
AEN = 1
ALPHA1_R/G/B
Non-Key area
ALPHA0_R/G/B
ALPHA_SEL = 0
@WINCON1[1]
KEYBLEND = 1
@W1KEYCON0[26]
Key area
ALPHA1_R/G/B
BLD_PIX = 1
@WINCON1[6]
ALPHA_SEL = 1
@WINCON1[1]
DATA[27:24] in frame buffer for 28bpp mode
3.2.1 COLOR-KEY FUNCTION
The LCD controller can support color-key function for the various effect of image mapping. Color image of OSD
layer, which is specified by COLOR-KEY register, will be substituted by background image for special
functionality, as cursor image or pre-view image of the camera.
The register value to ColorKey reg must be set in 24bit RGB format.
DIRCON (in Win1 Color Key 0 register) bit selects the window to be compared with COLVAL (in Win1 Color Key 1
Register). If this bit is set to ‘0’, the comparison window is window1 (foreground window).
COMPKEY (in Win1 Color Key 0 register) value decides whether to compare COLVAL and selected window color.
In other words, the comparator only compares COLVAL and selected window color bits where the corresponding
bit in COMPKEY is ‘0’.
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...