Preliminary
S3C2451X RISC MICROPROCESSOR
2D
19-5
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.
Off-Screen Rendering
Off-screen bit block transfer copies pixel data from off-screen memory to frame buffer. Color space conversion is
performed automatically if SRC_COLOR_MODE differs from DEST_COLOR_MODE. YUV 4:2:2 input is also
supported.
Transparent Mode
2D can render image in Transparent Mode. In this mode, the pixels having the same color with background color
(BG_COLOR) are discarded, resulting in a transparent effect. The function of Transparent Mode is illustrated in
the images below, in which the BG_COLOR is set to white.
Figure 19-5 Transparent Mode
2D also support Blue Screen Mode, in which the pixels having the same color with background color
(BG_COLOR) are replaced by the blue screen color (BS_COLOR).
2D supports both host-to-screen mode and memory-to-screen mode of BLT.
Related Registers
COORD_0
Coordinate of the leftmost topmost coordinate of the source image
COORD_1
Coordinate of the rightmost bottommost coordinate of the source image
COORD_2
Coordinate of the leftmost topmost coordinate of the destination image
COORD_3
Coordinate of the rightmost bottommost coordinate of the destination image
X-INCR
X increment value of the source image coordinates. If it is greater than 1, the image
is shrunk horizontally; smaller than 1, stretched. This value is ignored when S bit in
CMDR_1 is disabled or host-to-screen mode is used.
X-INCR = (COORD1_X – COORD0_X) / (COORD3_X – COORD2_X)
Y-INCR
Y increment value of the source image coordinates. If it is greater than 1, the image
is shrunk vertically; smaller than 1, stretched. This value is ignored when S bit in
CMDR_1 is disabled or host-to-screen mode is used.
Y_INCR = (COORD1_Y – COORD0_Y) / ( COORD3_Y – COORD2_Y)
SRC_BASE_ADDR
The base address of the source image (when memory-to-screen mode is used).