2 .\" Copyright (c) 1997 Søren Schmidt
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
8 .\" 1. Redistributions of source code must retain the above copyright
9 .\" notice, this list of conditions and the following disclaimer,
10 .\" in this position and unchanged.
11 .\" 2. Redistributions in binary form must reproduce the above copyright
12 .\" notice, this list of conditions and the following disclaimer in the
13 .\" documentation and/or other materials provided with the distribution.
14 .\" 3. The name of the author may not be used to endorse or promote products
15 .\" derived from this software without specific prior written permission.
17 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 .Nm VGLBitmapAllocateBits ,
34 .Nm VGLBitmapDestroy ,
35 .Nm VGLBitmapPutChar ,
44 .Nm VGLFilledEllipse ,
50 .Nm VGLKeyboardGetCh ,
53 .Nm VGLMouseSetImage ,
54 .Nm VGLMouseSetStdImage ,
59 .Nm VGLSetPaletteIndex ,
60 .Nm VGLSetVScreenSize ,
62 .Nm VGLTextSetFontFile
63 .Nd Video Graphics Library functions
72 .Fn VGLInit "int mode"
76 .Fn VGLCheckSwitch "void"
78 .Fn VGLTextSetFontFile "char *filename"
80 .Fn VGLKeyboardInit "int code"
82 .Fn VGLKeyboardEnd "void"
84 .Fn VGLKeyboardGetCh "void"
86 .Fn VGLMouseInit "int mode"
88 .Fn VGLMouseMode "int mode"
90 .Fn VGLMouseStatus "int *x" "int *y" "char *buttons"
92 .Fn VGLMouseSetImage "VGLBitmap *AndMask" "VGLBitmap *OrMask"
94 .Fn VGLMouseSetStdImage "void"
96 .Fn VGLGetXY "VGLBitmap *object" "int x" "int y"
98 .Fn VGLSetXY "VGLBitmap *object" "int x" "int y" "u_long color"
100 .Fn VGLLine "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "u_long color"
102 .Fn VGLBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "u_long color"
104 .Fn VGLFilledBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "u_long color"
106 .Fn VGLEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "u_long color"
108 .Fn VGLFilledEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "u_long color"
110 .Fn VGLBitmapCreate "int type" "int xsize" "int ysize" "byte *bits"
112 .Fn VGLBitmapDestroy "VGLBitmap *object"
114 .Fn VGLBitmapAllocateBits "VGLBitmap *object"
116 .Fn VGLBitmapCopy "VGLBitmap *src" "int srcx" "int srcy" "VGLBitmap *dst" "int dstx" "int dsty" "int width" "int hight"
118 .Fn VGLBitmapPutChar "VGLBitmap *Object" "int x" "int y" "byte ch" "u_long fgcol" "u_long bgcol" "int fill" "int dir"
120 .Fn VGLBitmapString "VGLBitmap *Object" "int x" "int y" "char *str" "u_long fgcol" "u_long bgcol" "int fill" "int dir"
122 .Fn VGLClear "VGLBitmap *object" "u_long color"
124 .Fn VGLSetPalette "byte *red" "byte *green" "byte *blue"
126 .Fn VGLSetPaletteIndex "byte color" "byte red" "byte green" "byte blue"
128 .Fn VGLSetBorder "byte color"
130 .Fn VGLSetVScreenSize "VGLBitmap *object" "int vxsize" "int vysize"
132 .Fn VGLPanScreen "VGLBitmap *object" "int x" "int y"
134 .Fn VGLBlankDisplay "int blank"
137 is a library that enables the programmer access to the graphics
138 modes supported by the console driver (syscons).
139 The library takes care of
140 programming the actual video hardware, and provides a number of simple
141 functions to do various graphic operations.
142 There is also support for a
143 mouse via the standard mouse system in
147 including the ability to transparently have a mouse pointer superimposed on
148 the graphic image currently being worked on.
149 The library takes care of screen switching by storing the current image in
150 memory before switching to another virtual console, and restoring when the
152 This allows several graphic applications at once, but
153 on different virtual consoles.
155 Below is a short description of the various functions:
158 initialize the library and set up the graphic mode
162 terminate graphic mode, and restore the screenmode that was active before
167 if the program goes into longer periods of processing without doing
168 any graphics output, calling this function occasionally will allow
169 the system to switch screens.
171 .Fn VGLTextSetFontFile
172 instruct the char/string functions to use the font in file
174 instead of the builtin font.
177 set up the keyboard in the
180 specify the key code to be used.
189 is specified, the keyboard translates the raw keyboard scan code into
193 is used, the raw keyboard scan code is read as is.
195 is the intermediate key code; each key is assigned a unique code whereas
196 more than one raw scan code may be generated when a key is pressed.
199 when you have finished using the keyboard, call this function.
202 read one byte from the keyboard.
203 As the keyboard I/O is in the
205 input mode, the function will not block even if there is no input data,
209 initialize the mouse.
210 The optional on-screen mouse pointer is shown if the
215 either shows the mouse pointer if the argument is
217 or hides the mouse pointer if the argument is
221 returns the current mouse pointer coordinates and button state in
224 The return value reflects if the mouse pointer
225 is currently shown on screen or not.
228 with this function it is possible to change the image of the mouse pointer
231 .Fn VGLMouseSetStdImage
232 this function restores the mouse pointer to the standard arrow.
235 retrieves the color of the pixel located at
239 argument, and returns it as a u_long value.
242 sets the color of the pixel located at
259 draw a box with upper left hand corner at
261 and lower right hand corner at
267 draw a filled (solid) box with upper left hand corner at
269 and lower right hand corner at
275 draw an ellipse centered at
285 draw a filled (solid) ellipse centered at
295 create a bitmap object and initialize it with the specified
300 for the in-memory bitmap.
302 may be NULL so that bitmap data may be associated later.
304 There also is a macro,
305 .Fn VGLBITMAP_INITIALIZER "type" "xsize" "ysize" "bits"
306 to initialize a statically declared bitmap object.
309 free the bitmap data and the bitmap object.
311 .Fn VGLBitmapAllocateBits
312 allocate a bit data buffer for the specified object.
315 copy a rectangle of pixels from bitmap
317 upper left hand corner at
335 is != 0, use the color
337 as background otherwise the background is transparent.
338 The character is drawn in the direction specified by the argument
350 is != 0, use the color
352 as background otherwise the background is transparent.
353 The string is drawn in the direction specified by the argument
357 clears the entire bitmap to color
361 this function sets the palette used, the arguments
362 .Va red , green , blue
363 should point to byte arrays of 256 positions each.
365 .Fn VGLSetPaletteIndex
366 set the palette index
368 to the specified RGB value.
371 set the border color to color
374 .Fn VGLSetVScreenSize
375 change the virtual screen size of the display.
377 function must be called when our vty is in the foreground.
382 Passing an in-memory bitmap to this function results in error.
384 The desired virtual screen width may not be achievable because
385 of the video card hardware.
386 In such case the video driver (and
387 underlying video BIOS) may choose the next largest values.
392 after calling this function, in order to see how the virtual screen
395 In order to set up the largest possible virtual screen, you may
396 call this function with arbitrary large values.
398 .Dl VGLSetVScreenSize(10000, 10000);
401 change the origin of the displayed screen in the virtual screen.
402 Note that this function must be called when our vty is in the
407 Passing an in-memory bitmap to this function results in error.
410 blank the display if the argument
413 This can be done to shut off the screen during display updates that
414 the user should first see when it is done.
415 .Ss Program termination and signal processing
416 It is important to call
418 before terminating the program.
419 Care must be taken if you install signal handlers and try to call
424 If a signal is caught while the program is inside
428 may not be able to properly restore the graphics hardware.
430 The recommended way to handle signals and program termination is to
431 have a flag to indicate signal's delivery.
432 Your signal handlers set this flag but do not terminate
433 the program immediately.
434 The main part of the program checks the flag to see if it is
435 supposed to terminate, and calls
443 installs its internal signal handlers for
444 .Dv SIGINT , SIGTERM , SIGSEGV ,
447 and terminates the program at appropriate time,
448 after one of these signals is caught.
449 If you want to have your own signal handlers for these signals,
457 are internally used by
459 to control screen switching and the mouse pointer,
460 and are not available to
469 .An S\(/oren Schmidt Aq Mt sos@FreeBSD.org