Epson S1D13506 Technical Manual page 505

Epson Research and Development
Vancouver Design Center
Configuration
Compile Switches
WINCEVER
EnablePreferVmem
Enable2DC
EnableDC2Hwblt
Windows® CE 3.x Display Drivers
Issue Date: 01/05/18
There are several issues to consider when configuring the display driver. The issues cover
debugging support, register initialization values and memory allocation. Each of these
issues is discussed in the following sections.
There are several switches, specific to the S1D13506 display driver, which affect the
display driver.
The switches are added or removed from the compile options in the file SOURCES.
This option is automatically set to the numerical version of WinCE for version 2.12 or later.
If the environment variable, _WINCEOSVER is not defined, then WINCEVER will
default 2.11. The S1D display driver may test against this option to support different
WinCE version-specific features.
This option enables the use of off-screen video memory. When this option is enabled,
WinCE can optimize some BLT operations by using off-screen video memory to store
images. You may need to disable this option for systems with 512K bytes of video memory
and VGA (640x480) panels.
This option enables the S1D13506 display driver to support an alternate device context.
This may be useful for applications such as Pocket PowerPoint, which can display a
different image on a display device other than the primary display. The driver support for
this is still under development and is UNTESTED.
Future releases of the S1D13506 display drivers will have full support for alternate
displays.
This option enables hardware BLT acceleration on the alternate display (see Enable2DC).
This option is currently unused and will be fully supported in future releases of the
S1D13506 display drivers.
Page 11
S1D13506
X25B-E-006-01