Epson S1D13705 Int seVirtInitDWORD VirtX, Dword * VirtY, Int seVirtMoveint Screen, int x, int y

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int seVirtInit(DWORD VirtX, DWORD * VirtY)

Description: This function prepares the system for virtual screen operation. The programmer passes the desired virtual width in pixels. When the routine returns VirtY will contain the maximum number of line that can be displayed at the requested virtual width.

Parameter: VirtX	- horizontal size of virtual display in pixels.
	(Must be greater or equal to physical size of display)
VirtY	- pointer to an integer to receive the maximum number of displayable
	lines of 'VirtX' width.

Return Value: ERR_OK - operation completed with no problems

ERR_HAL_BAD_ARG - returned in three situations:

1)the virtual width (VirtX) is greater than the largest possible width (VirtX varies with color depth and ranges from 4096 pixels wider

than the panel at 1 bit-per-pixel down to 512 pixels wider than the panel at 8 bit-per-pixel)

2)the virtual width is less than the physical width or

3)the maximum number of lines becomes less than the physical number of lines

Note

The system must have been initialized prior to calling seVirtInit()

int seVirtMove(int Screen, int x, int y)

Description: This routine pans and scrolls the display. In the case where split screen operation is being used, the Screen argument specifies which screen to move. The x and y param- eters specify, in pixels, the starting location in the virtual image for the top left corner of the applicable display.

Parameter: Screen	- must be set to 1 or 2, or use the constants SCREEN1 or SCREEN2,
	to identify which screen to base calculations on
x	- new starting X position in pixels
y	- new starting Y position in pixels

Return Value: ERR_OK - operation completed with no problems

ERR_HAL_BAD_ARG- there are several reasons for this return value:

1)WhichScreen is not SCREEN1 or SCREEN2.

2)the y argument is greater than the last available line less the screen height.

Note

seVirtInit() must be been called before calling seVirtMove().

Programming Notes and Examples	S1D13705
Issue Date: 02/01/22	X27A-G-002-03