5.2.6.4.4 Window Position, Size, Scaling and Striding Attributes
- XPOS and YPOS fields—Defines the position of the layer window.
- XSIZE and YSIZE fields—Defines the size of the displayed window.
- XMEMSIZE and YMEMSIZE fields—Defines the size of the image frame buffer.
- XSTRIDE —Defines the line striding.
- PSTRIDE —Defines the pixel striding.
- VXSYFACTOR and VXSCFACTOR fields—Defines the scaling ratio for the vertical scaler.
- HXSYFACTOR and HXSCFACTOR fields—Defines the scaling ratio for the horizontal scaler.
The position and size attributes are programmed to keep the window within the display area.
When CLUT mode is enabled, the restrictions detailed in the following table apply on the horizontal, vertical window sizes and discard attributes (Discard Area Horizontal Position, Discard Area Vertical Position, Discard Area Horizontal Size, Discard Area Vertical Size).
| CLUT Mode | X-Y Size/Discard Attributes Requirement |
|---|---|
| 1 bpp | Multiple of 8 pixels |
| 2 bpp | Multiple of 4 pixels |
| 4 bpp | Multiple of 2 pixels |
| 8 bpp | Free size |
Pixel striding is disabled when CLUT mode is enabled.
Depending on the input mode, the restrictions detailed in the following table apply on the window size.
| Mode | X-Y Requirement, Scaling Turned Off | X-Y Requirement, Scaling Turned On | XMEM_SIZE-YMEM_SIZE Requirement, Scaling Turned On |
|---|---|---|---|
| ARGB/CLUT | Free size |
XSIZE ≥ 3 pixels YSIZE ≥ 3 pixels |
XMEM_SIZE ≥ 3 pixels YMEM_SIZE ≥ 3 pixels |
| AYCbCr 4:4:4 | Free size |
XSIZE ≥ 3 pixels YSIZE ≥ 3 pixels |
XMEM_SIZE ≥ 3 pixels YMEM_SIZE ≥ 3 pixels |
| YCbCr 4:2:2 packed |
XSIZE ≥ 6 pixels Free YSIZE |
XSIZE ≥ 6 pixels YSIZE ≥ 3 pixels |
XMEM_SIZE ≥ 6 pixels, even YMEM_SIZE ≥ 3 pixels |
| YCbCr 4:2:2 semiplanar |
XSIZE ≥ 6 pixels Free YSIZE |
XSIZE ≥ 6 pixels YSIZE ≥ 3 pixels |
XMEM_SIZE ≥ 6 pixels YMEM_SIZE ≥ 3 pixels |
| YCbCr 4:2:2 planar |
XSIZE ≥ 6 pixels Free YSIZE |
XSIZE ≥ 6 pixels YSIZE ≥ 3 pixels |
XMEM_SIZE ≥ 6 pixels YMEM_SIZE ≥ 3 pixels |
|
YCbCr 4:2:0 semiplanar |
XSIZE ≥ 6 pixels YSIZE ≥ 6 pixels |
XSIZE ≥ 6 pixels YSIZE ≥ 6 pixels |
XMEM_SIZE ≥ 6 pixels YMEM_SIZE ≥ 6 pixels |
|
YCbCr 4:2:0 planar |
XSIZE ≥ 6 pixels YSIZE ≥ 6 pixels |
XSIZE ≥ 6 pixels YSIZE ≥ 6 pixels |
XMEM_SIZE ≥ 6 pixels YMEM_SIZE ≥ 6 pixels |