Philips S1D13505 用户手册

Page 11

Vancouver Design Center

Windows® CE 3.x Display Drivers

S1D13505

Issue Date: 01/05/17 

X23A-E-006-01

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 S1D13505 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 display driver support of antialiased fonts in WinCE. Fonts created 
with the ANTIALIASED_QUALITY attribute will be drawn with font smoothing. 

If you want all fonts to be antialiased by default, add the following line to 
PLATFORM.REG: [HKEY_LOCAL_MACHINE\SYSTEM\GDI\Fontsmoothing]. This 
registry option causes WinCE to draw all fonts with smoothing. 

Font smoothing is only applicable to 16bpp mode.

This debugging option enables the display of EPSON-specific debug messages. These 
debug message are sent to the serial debugging port. This option should be disabled unless 
you are debugging the display driver, as they will significantly impact the performance of 
the display driver.