1 .\" Copyright (c) 1997 Søren Schmidt
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
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13 .\" 3. The name of the author may not be used to endorse or promote products
14 .\" derived from this software without specific prior written permission.
16 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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27 .\" $FreeBSD: src/lib/libvgl/vgl.3,v 1.12.2.8 2001/12/17 10:08:35 ru Exp $
32 .Nm VGLBitmapAllocateBits ,
35 .Nm VGLBitmapDestroy ,
36 .Nm VGLBitmapPutChar ,
45 .Nm VGLFilledEllipse ,
51 .Nm VGLKeyboardGetCh ,
54 .Nm VGLMouseSetImage ,
55 .Nm VGLMouseSetStdImage ,
60 .Nm VGLSetPaletteIndex ,
61 .Nm VGLSetVScreenSize ,
63 .Nm VGLTextSetFontFile
64 .Nd Video Graphics Library functions
71 .Fn VGLInit "int mode"
75 .Fn VGLCheckSwitch "void"
77 .Fn VGLTextSetFontFile "char *filename"
79 .Fn VGLKeyboardInit "int code"
81 .Fn VGLKeyboardEnd "void"
83 .Fn VGLKeyboardGetCh "void"
85 .Fn VGLMouseInit "int mode"
87 .Fn VGLMouseMode "int mode"
89 .Fn VGLMouseStatus "int *x" "int *y" "char *buttons"
91 .Fn VGLMouseSetImage "VGLBitmap *AndMask" "VGLBitmap *OrMask"
93 .Fn VGLMouseSetStdImage "void"
95 .Fn VGLGetXY "VGLBitmap *object" "int x" "int y"
97 .Fn VGLSetXY "VGLBitmap *object" "int x" "int y" "byte color"
99 .Fn VGLLine "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
101 .Fn VGLBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
103 .Fn VGLFilledBox "VGLBitmap *object" "int x1" "int y1" "int x2" "int y2" "byte color"
105 .Fn VGLEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "byte color"
107 .Fn VGLFilledEllipse "VGLBitmap *object" "int xc" "int yc" "int a" "int b" "byte color"
109 .Fn VGLBitmapCreate "int type" "int xsize" "int ysize" "byte *bits"
111 .Fn VGLBitmapDestroy "VGLBitmap *object"
113 .Fn VGLBitmapAllocateBits "VGLBitmap *object"
115 .Fn VGLBitmapCopy "VGLBitmap *src" "int srcx" "int srcy" "VGLBitmap *dst" "int dstx" "int dsty" "int width" "int hight"
117 .Fn VGLBitmapPutChar "VGLBitmap *Object" "int x" "int y" "byte ch" "byte fgcol" "byte bgcol" "int fill" "int dir"
119 .Fn VGLBitmapString "VGLBitmap *Object" "int x" "int y" "char *str" "byte fgcol" "byte bgcol" "int fill" "int dir"
121 .Fn VGLClear "VGLBitmap *object" "byte color"
123 .Fn VGLSetPalette "byte *red" "byte *green" "byte *blue"
125 .Fn VGLSetPaletteIndex "byte color" "byte red" "byte green" "byte blue"
127 .Fn VGLSetBorder "byte color"
129 .Fn VGLSetVScreenSize "VGLBitmap *object" "int vxsize" "int vysize"
131 .Fn VGLPanScreen "VGLBitmap *object" "int x" "int y"
133 .Fn VGLBlankDisplay "int blank"
136 is a library that enables the programmer access to the graphics
137 modes supported by the console driver (syscons). The library takes care of
138 programming the actual video hardware, and provides a number of simple
139 functions to do various graphic operations.
140 There is also support for a
141 mouse via the standard mouse system in
145 including the ability to transparently have a mouse pointer superimposed on
146 the graphic image currently being worked on.
147 The library takes care of screen switching by storing the current image in
148 memory before switching to another virtual console, and restoring when the
150 This allows several graphic applications at once, but
151 on different virtual consoles.
153 Below is a short description of the various functions:
156 initialize the library and set up the graphic mode
160 terminate graphic mode, and restore the screenmode that was active before
165 if the program goes into longer periods of processing without doing
166 any graphics output, calling this function occasionally will allow
167 the system to switch screens.
169 .Fn VGLTextSetFontFile
170 instruct the char/string functions to use the font in file
172 instead of the builtin font.
175 set up the keyboard in the
178 specify the key code to be used.
187 is specified, the keyboard translate the raw keyboard scan code into
191 is used, the raw keyboard scan code is read as is.
193 is the intermediate key code; each key is assigned a unique code whereas
194 more than one raw scan code may be generated when a key is pressed.
197 when you have finished using the keyboard, call this function.
200 read one byte from the keyboard. As the keyboard I/O is in the
202 input mode, the function will not block even if there is no input data,
206 initialize the mouse.
207 The optional on-screen mouse pointer is shown if the
212 either shows the mouse pointer if the argument is
214 or hides the mouse pointer if the argument is
218 returns the current mouse pointer coordinates and button state in
221 The return value reflects if the mouse pointer
222 is currently shown on screen or not.
225 with this function it is possible to change the image of the mouse pointer
228 .Fn VGLMouseSetStdImage
229 this function restores the mouse pointer to the standard arrow.
232 retrieves the color of the pixel located at
236 argument, and returns it as a byte value.
239 sets the color of the pixel located at
256 draw a box with upper left hand corner at
258 and lower right hand corner at
264 draw a filled (solid) box with upper left hand corner at
266 and lower right hand corner at
272 draw an ellipse centered at
282 draw a filled (solid) ellipse centered at
292 create a bitmap object and initialize it with the specified
297 for the in-memory bitmap.
299 may be NULL so that bitmap data may be associated later.
301 There also is a macro,
302 .Fn VGLBITMAP_INITIALIZER "type" "xsize" "ysize" "bits"
303 to initialize a statically declared bitmap object.
306 free the bitmap data and the bitmap object.
308 .Fn VGLBitmapAllocateBits
309 allocate a bit data buffer for the specified object.
312 copy a rectangle of pixels from bitmap
314 upper left hand corner at
332 is != 0, use the color
334 as background otherwise the background is transparent.
335 The character is drawn in the direction specified by the argument
347 is != 0, use the color
349 as background otherwise the background is transparent.
350 The string is drawn in the direction specified by the argument
354 clears the entire bitmap to color
358 this function sets the palette used, the arguments
359 .Va red , green , blue
360 should point to byte arrays of 256 positions each.
362 .Fn VGLSetPaletteIndex
363 set the palette index
365 to the specified RGB value.
368 set the border color to color
371 .Fn VGLSetVScreenSize
372 change the virtual screen size of the display. Note that this
373 function must be called when our vty is in the foreground.
378 Passing a in-memory bitmap to this function results in error.
380 The desired virtual screen width may not be achievable because
381 of the video card hardware. In such case the video driver (and
382 underlaying video BIOS) may choose the next largest values.
387 after calling this function, in order to see how the virtual screen
390 In order to set up the largest possible virtual screen, you may
391 call this function with arbitrary large values.
393 .Dl VGLSetVScreenSize(10000, 10000);
396 change the origin of the displayed screen in the virtual screen.
397 Note that this function must be called when our vty is in the
402 Passing a in-memory bitmap to this function results in error.
405 blank the display if the argument
408 This can be done to shut off the screen during display updates that
409 the user should first see when it's done.
410 .Ss Program termination and signal processing
411 It is important to call
413 before terminating the program.
414 Care must be taken if you install signal handlers and try to call
419 If a signal is caught while the program is inside
423 may not be able to properly restore the graphics hardware.
425 The recommended way to handle signals and program termination is to
426 have a flag to indicate signal's delivery.
427 Your signal handlers set this flag but do not terminate
428 the program immediately.
429 The main part of the program checks the flag to see if it is
430 supposed to terminate, and calls
438 installs its internal signal handlers for
439 .Dv SIGINT , SIGTERM , SIGSEGV ,
442 and terminates the program at appropriate time,
443 after one of these signals is caught.
444 If you want to have your own signal handlers for these signals,
452 are internally used by
454 to control screen switching and the mouse pointer,
455 and are not available to
459 .An S\(/oren Schmidt Aq sos@FreeBSD.org