Samsung S5PC110 Manual page 1607

S5PC110_UM
9.3.1 VIDEO LAYER
Video data is directly transferred from Video Processor to Mixer in YCbCr [888] 4:4:4 formats. As the Video
Processor scales the source image in letterbox mode, the display region of the video data is smaller than the
screen size. In this case, background layer is seen in the blank region.
9.3.2 GRAPHIC LAYER
ARM or Graphic Accelerator generates the graphic source data in the external memory and they are transferred to
Mixer by AXI access. Mixer supports the following graphic formats.
•
16bpp RGB [565]
•
16bpp ARGB [1555]
•
16bpp ARGB [4444]
•
32bpp ARGB [8888]
In 16/32-bpp direct modes, the value of a pixel data directly indicates the RGB but the bit width for R, G, and B are
different for each mode. For 16bpp direct ARGB [4444] mode, the RGB component is assigned to 16 bit length
like the following.
15 14 13
alpha factor
The internal data path is processed with YCbCr[888] format, therefore RGB format is converted to YCbCr by color
matrix conversion.
If the bit-per-pixel (BPP) of color format is smaller than 8 bits, that value is used after expanding (Refer
example (ARGB [1555])).
Mixer supports up to two graphic layers and one video layer. Each layer is enabled or disabled and user can
configure the priority between layers. There is each blending factor between layers. The graphic layers has
different color format.
When specifying the X/Y coordinates and the width/height of a graphic layer, the graphic layers should be located
in the display region (720x480 in NTSC display mode, 720x576 in PAL display mode, 1280x720p/1920x1080i&p
in HD display mode). The Mixer does not support the clipping operation for the pixels that are displayed out of
screen.
12 11 10 9
R
Figure 9-5
4 3 2
Figure 9-6
8 7 6
G
16bpp ARGB Example
1 0 4
MSB padding
Example of Expanding
5 4 3 2
3 2
9 8BMIXER
1 0
B
Figure 9-6
9-27