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Epson Research and Development Page 37
Vancouver Design Center
Programming Notes and Examples S1D13708
Issue Date: 01/11/20 X39A-G-003-01
ADVANCE
D
IN
F
ORMATION
Subje
ct to C
ha
nge
7.3 Limitations
7.3.1 SwivelView 0° and 180°
In SwivelView 0° and 180°, the Main Window Line Address Offset registers
(REG[79h],REG[78h]) require the panel width to be a multiple of 32 ÷ bits-per-pixel. If
this is not the case, then the Main Window Line Address Offset registers must be
programmed to a longer line which meets this requirement. This longer line creates a virtual
image where the width is main window line address offset registers × 32 ÷ bits-per-pixel.
In SwivelView 0°, this virtual image should be drawn in display memory as left justified,
and in SwivelView 180°, this virtual image should be drawn in display memory as right
justified. A left-justified image is one drawn in display memory such that each of the
image’s lines only use the left most portion of the line width defined by the line address
offset register (i.e. starting at horizontal position 0). A right-justified image is one drawn in
display memory such that each of the image’s lines only use the right most portion of the
line width defined by the line address offset registers (i.e. starting at a non-zero horizontal
position which is the virtual width - image width).
7.3.2 SwivelView 90° and 270°
In SwivelView 90° and 270°, the Main Window Line Address Offset registers
(REG[79h],REG[78h]) require the panel height to be a multiple of 32 ÷ bits-per-pixel. If
this is not the case, then the Main Window Line Address Offset registers must be
programmed to a longer line which meets this requirement. This longer line creates a virtual
image whose width is main window line address offset registers × 32 ÷ bits-per-pixel. In
SwivelView 270°, this virtual image should be drawn in display memory as left justified,
and in SwivelView 90°, this virtual image should be drawn in display memory as right
justified. A left-justified image is one drawn in display memory such that each of the
image’s lines only use the left most portion of the line width defined by the line address
offset register (i.e. starting at horizontal position 0). A right-justified image is one drawn in
display memory such that each of the image’s lines only use the right most portion of the
line width defined by the line address offset register (i.e. starting at a non-zero horizontal
position which is the virtual width - image width).