281 lines
6.7 KiB
Groff
281 lines
6.7 KiB
Groff
.\" Copyright (c) 1997 Søren Schmidt
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer,
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.\" in this position and unchanged.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software withough specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Id: vgl.3,v 1.2 1997/10/16 09:12:31 sos Exp $
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.Dd August 13, 1997
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.Dt VGL 3
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.Os FreeBSD 3
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.Sh NAME
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.Nm vgl
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.Nd Video Graphics Library functions
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.Sh SYNOPSIS
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.Fd #include <vgl.h>
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.Sh DESCRIPTION
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Libvgl is a library that enables the programmer access to the graphics
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modes supported by the console driver (syscons). The library takes care of
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programming the actual video hardware, and provides a number of simple
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functions to do various graphic operations. There is also support for a
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mouse via the standard mouse system in FreeBSD, see
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.Fn moused
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, including the ability to transparently have a mouse pointer superimposed on
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the graphic image currently being worked on.
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The library takes care of screen switching by storing the current image in
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memory before switching to another virtual console, and restoring when the
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user switches back. This allows several graphic applications at once, but
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on different virtual consoles.
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Below is a short description of the various functions:
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.Sh AUTHOR
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.An Søren Schmidt (sos@FreeBSD.org)
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.Sh FUNCTIONS
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.Ft int
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.Fn VGLInit "int mode"
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Initialize the library and set up the graphic mode
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.Em mode .
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.Ft void
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.Fn VGLEnd "void"
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Terminate graphic mode, and restore the screenmode that was active before
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.Fn VGLInit
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was called.
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.Ft void
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.Fn VGLCheckSwitch "void"
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If the program goes into longer periods of processing without doing
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any graphics output, calling this function occasionally will allow
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the system to switch screens.
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.Ft int
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.Fn VGLTextSetFontFile "char *filename"
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Instruct the char/string functions to use the font in file
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.Em filename
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instead of the builtin font.
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.Ft int
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.Fn VGLMouseInit "int mode"
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Initialize the mouse. The optional on-screen mouse pointer is shown if the
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argument is
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.Em VGL_MOUSESHOW .
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.Ft void
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.Fn VGLMouseMode "int mode"
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Either shows the mouse pointer if the argument is
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.Em VGL_MOUSESHOW
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, or hides the mouse pointer if the argument is
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.Em VGL_MOUSEHIDE .
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.Ft int
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.Fn VGLMouseStatus "int *x" "int *y" "char *buttons"
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Returns the current mouse pointer coordinates and button state in
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.Em x, y
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, buttons. The return value reflects if the mouse pointer
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is currently shown on screen or not.
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.Ft void
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.Fn VGLMouseSetImage "VGLBitmap *AndMask" "VGLBitmap *OrMask"
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With this function it is possible to change the image of the mouse pointer
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on screen.
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.Ft void
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.Fn VGLMouseSetStdImage "void"
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This function restores the mouse pointer to the standard arrow.
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.Ft void
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.Fn VGLLine "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
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Draw a line from
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.Em x1, y1
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to
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.Em x2, y2
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in color
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.Em color .
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.Ft void
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.Fn VGLBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
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Draw a box with upper left hand corner at
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.Em x1, y1
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and lower right hand corner at
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.Em x2, y2
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in color
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.Em color .
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.Ft void
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.Fn VGLFilledBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
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Draw a filled (solid) box with upper left hand corner at
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.Em x1, y1
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and lower right hand corner at
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.Em x2, y2
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in color
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.Em color .
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.Ft void
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.Fn VGLEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "byte color"
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Draw an ellipse centered at
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.Em xc, yc
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make it
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.Em a
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pixels wide, and
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.Em b
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pixels high in color
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.Em color .
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.Ft void
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.Fn VGLFilledEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "byte color"
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Draw a filled (solid) ellipse centered at
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.Em xc, yc
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make it
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.Em a
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pixels wide, and
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.Em b
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pixels high in color
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.Em color .
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.Ft int
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.Fn VGLBitmapCopy "VGLBitmap *src" "int srcx" "int srcy" "VGLBitmap *dst" "int dstx" "int dsty" "int width" "int hight"
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Copy a rectangle of pixels from bitmap
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.Em src
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upper left hand corner at
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.Em srcx, srcy
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to bitmap
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.Em dst
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at
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.Em dstx, dsty
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of the size
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.Em width, height .
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.Ft void
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.Fn VGLBitmapPutChar "VGLBitmap *Object" "int x" "int y" "byte ch" "byte fgcol" "byte bgcol" "int fill" "int dir"
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Write the character
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.Em ch
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at position
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.Em x, y
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in foreground color
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.Em fgcol.
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If
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.Em fill
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is != 0, use the color
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.Em bgcol
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as background otherwise the background is transparent.
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The character is drawn in the direction specified by the argument
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.Em dir .
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.Ft void
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.Fn VGLBitmapString "VGLBitmap *Object" "int x" "int y" "char *str" "byte fgcol" "byte bgcol" "int fill" "int dir"
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Write the string
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.Em str
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at position
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.Em x, y
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in foreground color
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.Em fgcol.
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If
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.Em fill
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is != 0, use the color
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.Em bgcol
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as background otherwise the background is transparent.
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The string is drawn in the direction specified by the argument
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.Em dir .
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.Ft void
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.Fn VGLClear "VGLBitmap *object" "byte color"
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Clears the entire bitmap to color
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.Em color .
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.Ft void
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.Fn VGLSetPalette "byte *red" "byte *green" "byte *blue"
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This function sets the palette used, the arguments
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.Em red, green, blue
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should point to byte arrays of 256 positions each.
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.Ft void
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.Fn VGLSetPaletteIndex "byte color" "byte red" "byte green" "byte blue"
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Set the palette index
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.Em color
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to the specified RGB value.
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.Ft void
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.Fn VGLSetBorder "byte color"
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Set the border color to color
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.Em color .
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.Ft void
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.Fn VGLBlankDisplay "int blank"
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Blank the display if the argment
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.Em blank
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!= 0. This can be done to shut off the screen during display updates that
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the user should first see when it's done.
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.Sh HISTORY
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The
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.Nm
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library appeared in FreeBSD 3.0
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