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Windows CE Driver
Description
4
P1055866-001 TTP 2030™ Windows CE Software Integrator Guide 4/14/2013
Printer Driver
The printer driver for the TTP 2030 is named TTP2000.DLL. The Windows CE graphics
device interface (GDI) and display driver perform most of the work involved in printing. At
the beginning of the printing process, GDI creates a device context with attributes that are
retrieved from the printer driver during a call to DrvEnablePDEV. The display driver, not the
printer driver, is used to render subsequent drawing commands that are issued from the
application into the device context. Therefore, some drawing functions that are present in a
printer driver, such as DrvStrokePath, are never called because the printer driver only renders
the document internally.
The printer driver converts the bitmap data from a GDI bitmap format into the format that is
recognized by the printer. This can include such operations as color reduction to the color
space of the printer, data compression, and data conversion into the format that is used by the
printer – a format sometimes known as a page-description language (PDL). Then, the printer
driver calls the port monitor to send the rendered image to the printer.
Only a small number of the graphics driver functions defined for printer drivers are required in
printer drivers for Windows CE. Printer drivers are required to implement only those graphics
driver functions that are necessary for gathering printer metrics, setting up the printer, starting
and ending print jobs, and preparing content for printing.
The following table shows the functions implemented in the driver:
Table 1 • Driver Functions
Function Description
DrvCopyBits Translates between device-managed raster surfaces and
graphics device interface (GDI) standard format bitmaps.
DrvDisablePDEV Used by MGDI to notify a driver that the specified PDEV
structure is no longer needed.
DrvDisableSurface Used by the GDI to notify a driver that the surface created
by the DrvEnableSurface function for the current device
is no longer needed.
DrvEnableDriver Specifies the initial driver entry point exported by the
driver DLL for devices that link directly to GWES, such
as display drivers and printer drivers. It fills a
DRVENABLEDATA structure with the driver version
number and calling addresses of functions supported by
the driver.
DrvEnablePDEV Enables a device context for drawing and returns device
metrics for the target printer or display device in a
GDIINFO structure. Printer drivers call a display driver's
DrvEnablePDEV function to create and initialize the
device context, and then substitute the printer's device
metrics before returning the device context to the GDI for
bitmap rendering.
DrvEnableSurface Sets up a surface to be drawn on and associates it with a
specified PDEV.
DrvEndDoc Called by the GDI to finish or abort a print job.