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VGL(3)		       FreeBSD Library Functions Manual			VGL(3)

NAME
     VGLBitmapAllocateBits, VGLBitmapCopy, VGLBitmapCreate, VGLBitmapDestroy,
     VGLBitmapPutChar, VGLBitmapString,	VGLBlankDisplay, VGLBox,
     VGLCheckSwitch, VGLClear, VGLEllipse, VGLEnd, VGLFilledBox,
     VGLFilledEllipse, VGLGetXY, VGLInit, VGLLine, VGLKeyboardInit,
     VGLKeyboardEnd, VGLKeyboardGetCh, VGLMouseInit, VGLMouseMode,
     VGLMouseSetImage, VGLMouseSetStdImage, VGLMouseStatus, VGLPanScreen,
     VGLSetBorder, VGLSetPalette, VGLSetPaletteIndex, VGLSetVScreenSize,
     VGLSetXY, VGLTextSetFontFile -- Video Graphics Library functions

LIBRARY
     Video Graphics Library (libvgl, -lvgl)

SYNOPSIS
     #include <sys/fbio.h>
     #include <sys/consio.h>
     #include <sys/kbio.h>
     #include <vgl.h>

     int
     VGLInit(int mode);

     void
     VGLEnd(void);

     void
     VGLCheckSwitch(void);

     int
     VGLTextSetFontFile(char *filename);

     int
     VGLKeyboardInit(int code);

     void
     VGLKeyboardEnd(void);

     int
     VGLKeyboardGetCh(void);

     int
     VGLMouseInit(int mode);

     void
     VGLMouseMode(int mode);

     int
     VGLMouseStatus(int	*x, int	*y, char *buttons);

     void
     VGLMouseSetImage(VGLBitmap	*AndMask, VGLBitmap *OrMask);

     void
     VGLMouseSetStdImage(void);

     u_long
     VGLGetXY(VGLBitmap	*object, int x,	int y);

     void
     VGLSetXY(VGLBitmap	*object, int x,	int y, u_long color);

     void
     VGLLine(VGLBitmap *object,	int x1,	int y1,	int x2,	int y2,	u_long color);

     void
     VGLBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color);

     void
     VGLFilledBox(VGLBitmap *object, int x1, int y1, int x2, int y2,
	 u_long	color);

     void
     VGLEllipse(VGLBitmap *object, int xc, int yc, int a, int b,
	 u_long	color);

     void
     VGLFilledEllipse(VGLBitmap	*object, int xc, int yc, int a,	int b,
	 u_long	color);

     VGLBitmap *
     VGLBitmapCreate(int type, int xsize, int ysize, byte *bits);

     void
     VGLBitmapDestroy(VGLBitmap	*object);

     int
     VGLBitmapAllocateBits(VGLBitmap *object);

     int
     VGLBitmapCopy(VGLBitmap *src, int srcx, int srcy, VGLBitmap *dst,
	 int dstx, int dsty, int width,	int hight);

     void
     VGLBitmapPutChar(VGLBitmap	*Object, int x,	int y, byte ch,	byte fgcol,
	 byte bgcol, int fill, int dir);

     void
     VGLBitmapString(VGLBitmap *Object,	int x, int y, char *str, byte fgcol,
	 byte bgcol, int fill, int dir);

     void
     VGLClear(VGLBitmap	*object, u_long	color);

     void
     VGLSetPalette(byte	*red, byte *green, byte	*blue);

     void
     VGLSetPaletteIndex(byte color, byte red, byte green, byte blue);

     void
     VGLSetBorder(byte color);

     int
     VGLSetVScreenSize(VGLBitmap *object, int vxsize, int vysize);

     int
     VGLPanScreen(VGLBitmap *object, int x, int	y);

     void
     VGLBlankDisplay(int blank);

DESCRIPTION
     Libvgl is a library that enables the programmer access to the graphics
     modes supported by	the console driver (syscons). The library takes	care
     of	programming the	actual video hardware, and provides a number of	simple
     functions to do various graphic operations.  There	is also	support	for a
     mouse via the standard mouse system in FreeBSD, see mouse(4), including
     the ability to transparently have a mouse pointer superimposed on the
     graphic image currently being worked on.  The library takes care of
     screen switching by storing the current image in memory before switching
     to	another	virtual	console, and restoring when the	user switches back.
     This allows several graphic applications at once, but on different	vir-
     tual consoles.

     Below is a	short description of the various functions:

     VGLInit() initialize the library and set up the graphic mode mode.

     VGLEnd() terminate	graphic	mode, and restore the screenmode that was
     active before VGLInit() was called.

     VGLCheckSwitch() if the program goes into longer periods of processing
     without doing any graphics	output,	calling	this function occasionally
     will allow	the system to switch screens.

     VGLTextSetFontFile() instruct the char/string functions to	use the	font
     in	file filename instead of the builtin font.

     VGLKeyboardInit() set up the keyboard in the ``raw'' I/O mode and specify
     the key code to be	used.  code must be VGL_XLATEKEYS, VGL_CODEKEYS, or
     VGL_RAWKEYS.  When	VGL_XLATEKEYS is specified, the	keyboard translate the
     raw keyboard scan code into a character code.  If VGL_RAWKEYS is used,
     the raw keyboard scan code	is read	as is.	VGL_CODEKEYS is	the intermedi-
     ate key code; each	key is assigned	a unique code whereas more than	one
     raw scan code may be generated when a key is pressed.

     VGLKeyboardEnd() when you have finished using the keyboard, call this
     function.

     VGLKeyboardGetCh()	read one byte from the keyboard.  As the keyboard I/O
     is	in the ``raw'' input mode, the function	will not block even if there
     is	no input data, and returns 0.

     VGLMouseInit() initialize the mouse.  The optional	on-screen mouse
     pointer is	shown if the argument is VGL_MOUSESHOW.

     VGLMouseMode() either shows the mouse pointer if the argument is
     VGL_MOUSESHOW, or hides the mouse pointer if the argument is
     VGL_MOUSEHIDE.

     VGLMouseStatus() returns the current mouse	pointer	coordinates and	button
     state in x, y, buttons.  The return value reflects	if the mouse pointer
     is	currently shown	on screen or not.

     VGLMouseSetImage()	with this function it is possible to change the	image
     of	the mouse pointer on screen.

     VGLMouseSetStdImage() this	function restores the mouse pointer to the
     standard arrow.

     VGLGetXY()	retrieves the color of the pixel located at x, y, coordinates
     of	the object argument, and returns it as a byte value.

     VGLSetXY()	sets the color of the pixel located at x, y, coordinates of
     the object	argument to color byte value.

     VGLLine() draw a line from	x1, y1 to x2, y2 in color color.

     VGLBox() draw a box with upper left hand corner at	x1, y1 and lower right
     hand corner at x2,	y2 in color color.

     VGLFilledBox() draw a filled (solid) box with upper left hand corner at
     x1, y1 and	lower right hand corner	at x2, y2 in color color.

     VGLEllipse() draw an ellipse centered at xc, yc make it a pixels wide,
     and b pixels high in color	color.

     VGLFilledEllipse()	draw a filled (solid) ellipse centered at xc, yc make
     it	a pixels wide, and b pixels high in color color.

     VGLBitmapCreate() create a	bitmap object and initialize it	with the spec-
     ified values and bit data.	 type must be MEMBUF for the in-memory bitmap.
     bits may be NULL so that bitmap data may be associated later.

     There also	is a macro, VGLBITMAP_INITIALIZER(type,	xsize, ysize, bits) to
     initialize	a statically declared bitmap object.

     VGLBitmapDestroy()	free the bitmap	data and the bitmap object.

     VGLBitmapAllocateBits() allocate a	bit data buffer	for the	specified
     object.

     VGLBitmapCopy() copy a rectangle of pixels	from bitmap src	upper left
     hand corner at srcx, srcy to bitmap dst at	dstx, dsty of the size width,
     height.

     VGLBitmapPutChar()	write the character ch at position x, y	in foreground
     color fgcol.  If fill is != 0, use	the color bgcol	as background other-
     wise the background is transparent.  The character	is drawn in the	direc-
     tion specified by the argument dir.

     VGLBitmapString() write the string	str at position	x, y in	foreground
     color fgcol.  If fill is != 0, use	the color bgcol	as background other-
     wise the background is transparent.  The string is	drawn in the direction
     specified by the argument dir.

     VGLClear()	clears the entire bitmap to color color.

     VGLSetPalette() this function sets	the palette used, the arguments	red,
     green, blue should	point to byte arrays of	256 positions each.

     VGLSetPaletteIndex() set the palette index	color to the specified RGB
     value.

     VGLSetBorder() set	the border color to color color.

     VGLSetVScreenSize() change	the virtual screen size	of the display.	 Note
     that this function	must be	called when our	vty is in the foreground.  And
     object must be VGLDisplay.	 Passing an in-memory bitmap to	this function
     results in	error.

     The desired virtual screen	width may not be achievable because of the
     video card	hardware.  In such case	the video driver (and underlaying
     video BIOS) may choose the	next largest values.  Always examine
     object-_VXsize and	VYsize after calling this function, in order to	see
     how the virtual screen is actually	set up.

     In	order to set up	the largest possible virtual screen, you may call this
     function with arbitrary large values.

	   VGLSetVScreenSize(10000, 10000);

     VGLPanSreen() change the origin of	the displayed screen in	the virtual
     screen.  Note that	this function must be called when our vty is in	the
     foreground.  object must be VGLDisplay.  Passing an in-memory bitmap to
     this function results in error.

     VGLBlankDisplay() blank the display if the	argument blank != 0.  This can
     be	done to	shut off the screen during display updates that	the user
     should first see when it's	done.

   Program termination and signal processing
     It	is important to	call VGLEnd() before terminating the program.  Care
     must be taken if you install signal handlers and try to call VGLEnd() and
     exit(3) to	end the	program.  If a signal is caught	while the program is
     inside libvgl functions, VGLEnd() may not be able to properly restore the
     graphics hardware.

     The recommended way to handle signals and program termination is to have
     a flag to indicate	signal's delivery.  Your signal	handlers set this flag
     but do not	terminate the program immediately.  The	main part of the pro-
     gram checks the flag to see if it is supposed to terminate, and calls
     VGLEnd() and exit(3) if the flag is set.

     Note that VGLInit() installs its internal signal handlers for SIGINT,
     SIGTERM, SIGSEGV, and SIGBUS, and terminates the program at appropriate
     time, after one of	these signals is caught.  If you want to have your own
     signal handlers for these signals,	install	handlers after VGLInit().

     SIGUSR1 and SIGUSR2 are internally	used by	libvgl to control screen
     switching and the mouse pointer, and are not available to libvgl client
     programs.

AUTHORS
     Soren Schmidt <sos@FreeBSD.org>

HISTORY
     The vgl library appeared in FreeBSD 3.0.

FreeBSD	10.1		       November	7, 1999			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | AUTHORS | HISTORY

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