Samsung S3C6400X User Manual page 539

S3C6400X RISC MICROPROCESSOR
4) Final Data = Source AND Destination. ROP Value = "11110000" & "11001100" = "11000000"
5) Final Data = Source OR Pattern. ROP Value = "11110000" | "10101010" = "11111010".
Related Registers
PATTERN_REG[0:31]
PATOFF_REG
ROP_REG
ALPHA BLENDING
Alpha Blending combines the source color and the destination color in the frame buffer to get the new destination
color. FIMG-2D supports 256-level user-specified alpha value and per-pixel alpha blending as well. Fading effect
is also supported.
User-specified alpha value: ALPHA (from 0 to 255)
[Alpha Blending]
data = ( source * (ALPHA+1) + destination * (256-ALPHA) ) >> 8
[Fading]
data = (( source * (ALPHA+1) ) >> 8) + fading offset
Per-pixel alpha blending: alpha(given by the source image, from 0 to 255)
[Alpha Blending]
data = ( source * (alpha + 1) + destination * (256-alpha) ) >> 8
[Fading]
data = ((source * (alpha+1)) >> 8) + fading offset
Related Registers
ROP_REG
ALPHA_REG
Pattern data
Pattern offset X, Y
ROP configurations and ROP Value
Alpha blending configurations: alpha blending disable/enable, per-pixel alpha
blending disable/enable, fading disable/enable.
Alpha value and fading value.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
GRAPHICS 2D
18-7