2 * Acess2 Virtual Terminal Driver
7 #include <tpl_drv_video.h>
8 #include <tpl_drv_keyboard.h>
9 #include <tpl_drv_terminal.h>
13 #define VERSION ((0<<8)|(50))
16 #define MAX_INPUT_CHARS32 64
17 #define MAX_INPUT_CHARS8 (MAX_INPUT_CHARS32*4)
18 #define VT_SCROLLBACK 1 // 2 Screens of text
19 #define DEFAULT_OUTPUT "VGA"
20 //#define DEFAULT_OUTPUT "/Devices/BochsGA"
21 #define DEFAULT_INPUT "PS2Keyboard"
22 #define DEFAULT_WIDTH 80
23 #define DEFAULT_HEIGHT 25
24 #define DEFAULT_COLOUR (VT_COL_BLACK|(0xAAA<<16))
26 #define VT_FLAG_HIDECSR 0x01
29 VT_INMODE_TEXT8, // UTF-8 Text Mode (VT100 Emulation)
30 VT_INMODE_TEXT32, // UTF-32 Text Mode (Acess Native)
36 int Mode; //!< Current Mode (see ::eTplTerminal_Modes)
37 int Flags; //!< Flags (see VT_FLAG_*)
38 short Width; //!< Virtual Width
39 short Height; //!< Virtual Height
40 short RealWidth; //!< Real Width
41 short RealHeight; //!< Real Height
43 int ViewPos; //!< View Buffer Offset (Text Only)
44 int WritePos; //!< Write Buffer Offset (Text Only)
45 Uint32 CurColour; //!< Current Text Colour
46 char Name[2]; //!< Name of the terminal
48 int InputRead; //!< Input buffer read position
49 int InputWrite; //!< Input buffer write position
50 char InputBuffer[MAX_INPUT_CHARS8];
59 int VT_Install(char **Arguments);
60 char *VT_ReadDir(tVFS_Node *Node, int Pos);
61 tVFS_Node *VT_FindDir(tVFS_Node *Node, char *Name);
62 int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data);
63 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
64 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
65 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data);
66 void VT_SetTerminal(int ID);
67 void VT_KBCallBack(Uint32 Codepoint);
68 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count);
69 int VT_int_ParseEscape(tVTerm *Term, char *Buffer);
70 void VT_int_PutChar(tVTerm *Term, Uint32 Ch);
71 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll );
74 const Uint16 caVT100Colours[] = {
75 VT_COL_BLACK, 0x700, 0x070, 0x770, 0x007, 0x707, 0x077, 0xAAA,
76 VT_COL_GREY, 0xF00, 0x0F0, 0xFF0, 0x00F, 0xF0F, 0x0FF, VT_COL_WHITE
80 MODULE_DEFINE(0, VERSION, VTerm, VT_Install, NULL, DEFAULT_OUTPUT, DEFAULT_INPUT, NULL);
81 tDevFS_Driver gVT_DrvInfo = {
84 .Flags = VFS_FFLAG_DIRECTORY,
88 .ReadDir = VT_ReadDir,
89 .FindDir = VT_FindDir,
90 .IOCtl = VT_Root_IOCtl
94 tVTerm gVT_Terminals[NUM_VTS];
95 int giVT_CurrentTerminal = 0;
96 // --- Driver Handles ---
97 char *gsVT_OutputDevice = NULL;
98 char *gsVT_InputDevice = NULL;
99 int giVT_OutputDevHandle = -2;
100 int giVT_InputDevHandle = -2;
101 // --- Key States --- (Used for VT Switching/Magic Combos)
102 int gbVT_CtrlDown = 0;
103 int gbVT_AltDown = 0;
104 int gbVT_SysrqDown = 0;
108 * \fn int VT_Install(char **Arguments)
109 * \brief Installs the Virtual Terminal Driver
111 int VT_Install(char **Arguments)
113 char **args = Arguments;
120 for( ; (arg = *args); args++ )
122 if(arg[0] != '-') continue;
128 if(args[1] == NULL) break;
129 if(gsVT_OutputDevice) free(gsVT_OutputDevice);
130 gsVT_OutputDevice = malloc(strlen(args[1])+1);
131 strcpy(gsVT_OutputDevice, args[1]);
137 if(args[1] == NULL) break;
138 if(gsVT_InputDevice) free(gsVT_InputDevice);
139 gsVT_InputDevice = malloc(strlen(args[1])+1);
140 strcpy(gsVT_InputDevice, args[1]);
149 if(!gsVT_OutputDevice) gsVT_OutputDevice = "/Devices/"DEFAULT_OUTPUT;
150 if(!gsVT_InputDevice) gsVT_InputDevice = "/Devices/"DEFAULT_INPUT;
152 LOG("Using '%s' as output", gsVT_OutputDevice);
153 LOG("Using '%s' as input", gsVT_InputDevice);
156 for( i = 0; i < NUM_VTS; i++ )
158 gVT_Terminals[i].Mode = TERM_MODE_TEXT;
159 gVT_Terminals[i].Flags = 0;
160 gVT_Terminals[i].Width = DEFAULT_WIDTH;
161 gVT_Terminals[i].Height = DEFAULT_HEIGHT;
162 gVT_Terminals[i].CurColour = DEFAULT_COLOUR;
163 gVT_Terminals[i].WritePos = 0;
164 gVT_Terminals[i].ViewPos = 0;
166 gVT_Terminals[i].Buffer = malloc( DEFAULT_WIDTH*DEFAULT_HEIGHT*VT_SCROLLBACK*sizeof(tVT_Char) );
167 memset( gVT_Terminals[i].Buffer, 0, DEFAULT_WIDTH*DEFAULT_HEIGHT*VT_SCROLLBACK*sizeof(tVT_Char) );
169 gVT_Terminals[i].Name[0] = '0'+i;
170 gVT_Terminals[i].Name[1] = '\0';
171 gVT_Terminals[i].Node.Inode = i;
172 gVT_Terminals[i].Node.ImplPtr = &gVT_Terminals[i];
173 gVT_Terminals[i].Node.NumACLs = 0; // Only root can open virtual terminals
175 gVT_Terminals[i].Node.Read = VT_Read;
176 gVT_Terminals[i].Node.Write = VT_Write;
177 gVT_Terminals[i].Node.IOCtl = VT_Terminal_IOCtl;
181 DevFS_AddDevice( &gVT_DrvInfo );
187 * \fn void VT_InitOutput()
188 * \brief Initialise Video Output
192 giVT_OutputDevHandle = VFS_Open(gsVT_OutputDevice, VFS_OPENFLAG_WRITE);
193 LOG("giVT_OutputDevHandle = %x\n", giVT_OutputDevHandle);
198 * \fn void VT_InitInput()
199 * \brief Initialises the input
203 giVT_InputDevHandle = VFS_Open(gsVT_InputDevice, VFS_OPENFLAG_READ);
204 LOG("giVT_InputDevHandle = %x\n", giVT_InputDevHandle);
205 if(giVT_InputDevHandle == -1) return ;
206 VFS_IOCtl(giVT_InputDevHandle, KB_IOCTL_SETCALLBACK, VT_KBCallBack);
210 * \fn char *VT_ReadDir(tVFS_Node *Node, int Pos)
211 * \brief Read from the VTerm Directory
213 char *VT_ReadDir(tVFS_Node *Node, int Pos)
215 if(Pos < 0) return NULL;
216 if(Pos >= NUM_VTS) return NULL;
217 return strdup( gVT_Terminals[Pos].Name );
221 * \fn tVFS_Node *VT_FindDir(tVFS_Node *Node, char *Name)
222 * \brief Find an item in the VTerm directory
224 tVFS_Node *VT_FindDir(tVFS_Node *Node, char *Name)
228 //ENTER("pNode sName", Node, Name);
230 // Open the input and output files if needed
231 if(giVT_OutputDevHandle == -2) VT_InitOutput();
232 if(giVT_InputDevHandle == -2) VT_InitInput();
235 if(Name[0] < '0' || Name[0] > '9' || Name[1] != '\0') {
246 //LEAVE('p', &gVT_Terminals[num].Node);
247 return &gVT_Terminals[num].Node;
251 * \fn int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
252 * \brief Control the VTerm Driver
254 int VT_Root_IOCtl(tVFS_Node *Node, int Id, void *Data)
259 case DRV_IOCTL_TYPE: return DRV_TYPE_MISC;
260 case DRV_IOCTL_IDENT: memcpy(Data, "VT\0\0", 4); return 0;
261 case DRV_IOCTL_VERSION: return VERSION;
262 case DRV_IOCTL_LOOKUP: return 0;
264 case 4: // Get Video Driver
265 if(Data) strcpy(Data, gsVT_OutputDevice);
266 return strlen(gsVT_OutputDevice);
268 case 5: // Set Video Driver
269 if(!Data) return -EINVAL;
270 if(Threads_GetUID() != 0) return -EACCES;
274 free(gsVT_OutputDevice);
276 gsVT_OutputDevice = malloc(len+1);
277 strcpy(gsVT_OutputDevice, Data);
279 VFS_Close(giVT_OutputDevHandle);
280 giVT_OutputDevHandle = -1;
289 * \fn Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
290 * \brief Read from a virtual terminal
292 Uint64 VT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
295 tVTerm *term = &gVT_Terminals[ Node->Inode ];
297 // Check current mode
303 while(term->InputRead == term->InputWrite) Threads_Yield();
305 ((char*)Buffer)[pos] = term->InputBuffer[term->InputRead];
308 term->InputRead %= MAX_INPUT_CHARS8;
313 case TERM_MODE_OPENGL:
316 while(term->InputRead == term->InputWrite) Threads_Yield();
317 while(term->InputRead != term->InputWrite)
319 ((Uint32*)Buffer)[pos] = ((Uint32*)term->InputBuffer)[term->InputRead];
322 term->InputRead %= MAX_INPUT_CHARS32;
331 * \fn Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
332 * \brief Write to a virtual terminal
334 Uint64 VT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
336 tVTerm *term = &gVT_Terminals[ Node->Inode ];
338 //ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
344 VT_int_PutString(term, Buffer, Length);
353 * \fn int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
354 * \brief Call an IO Control on a virtual terminal
356 int VT_Terminal_IOCtl(tVFS_Node *Node, int Id, void *Data)
359 tVTerm *term = Node->ImplPtr;
362 case DRV_IOCTL_TYPE: return DRV_TYPE_TERMINAL;
363 case DRV_IOCTL_IDENT: memcpy(Data, "VT\0\0", 4); return 0;
364 case DRV_IOCTL_VERSION: return VERSION;
365 case DRV_IOCTL_LOOKUP: return 0;
367 // Get/Set the mode (and apply any changes)
368 case TERM_IOCTL_MODETYPE:
369 if(Data == NULL) return term->Mode;
371 // Update the screen dimensions
372 if(giVT_CurrentTerminal == Node->Inode)
373 VT_SetTerminal( giVT_CurrentTerminal );
376 // Get/set the terminal width
377 case TERM_IOCTL_WIDTH:
378 if(Data == NULL) return term->Width;
379 term->Width = *iData;
382 // Get/set the terminal height
383 case TERM_IOCTL_HEIGHT:
384 if(Data == NULL) return term->Height;
385 term->Height = *iData;
395 * \fn void VT_SetTerminal(int ID)
396 * \brief Set the current terminal
398 void VT_SetTerminal(int ID)
400 tVideo_IOCtl_Mode mode = {0};
403 // Create the video mode
404 mode.width = gVT_Terminals[ ID ].Width;
405 mode.height = gVT_Terminals[ ID ].Height;
407 if(gVT_Terminals[ ID ].Mode == TERM_MODE_TEXT) {
409 mode.flags = VIDEO_FLAG_TEXT;
411 // - Framebuffer or 3D
418 VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_FINDMODE, &mode );
420 gVT_Terminals[ ID ].RealWidth = mode.width;
421 gVT_Terminals[ ID ].RealHeight = mode.height;
422 VFS_IOCtl( giVT_OutputDevHandle, VIDEO_IOCTL_SETMODE, &modeNum );
426 * \fn void VT_KBCallBack(Uint32 Codepoint)
427 * \brief Called on keyboard interrupt
429 void VT_KBCallBack(Uint32 Codepoint)
431 tVTerm *term = &gVT_Terminals[giVT_CurrentTerminal];
433 // How the hell did we get a Codepoint of zero?
434 if(Codepoint == 0) return;
437 if( Codepoint & 0x80000000 )
439 Codepoint &= 0x7FFFFFFF;
466 if(!gbVT_AltDown || !gbVT_CtrlDown)
471 giVT_CurrentTerminal = 0;
474 giVT_CurrentTerminal = 0;
477 giVT_CurrentTerminal = 0;
480 giVT_CurrentTerminal = 0;
487 if(term->Mode == TERM_MODE_TEXT)
492 // Ignore Modifer Keys
493 if(Codepoint > KEY_MODIFIERS) return;
495 // Get UTF-8/ANSI Encoding
499 buf[0] = '\x1B'; buf[1] = '[';
500 buf[2] = 'D'; len = 3;
503 buf[0] = '\x1B'; buf[1] = '[';
504 buf[2] = 'C'; len = 3;
507 len = WriteUTF8( buf, Codepoint );
508 //Log("Codepoint = 0x%x", Codepoint);
512 //Log("len = %i, buf = %s", len, buf);
515 if( MAX_INPUT_CHARS8 - term->InputWrite >= len )
516 memcpy( &term->InputBuffer[term->InputWrite], buf, len );
518 memcpy( &term->InputBuffer[term->InputWrite], buf, MAX_INPUT_CHARS8 - term->InputWrite );
519 memcpy( &term->InputBuffer[0], buf, len - (MAX_INPUT_CHARS8 - term->InputWrite) );
521 // Roll the buffer over
522 term->InputWrite += len;
523 term->InputWrite %= MAX_INPUT_CHARS8;
524 if( (term->InputWrite - term->InputRead + MAX_INPUT_CHARS8)%MAX_INPUT_CHARS8 < len ) {
525 term->InputRead = term->InputWrite + 1;
526 term->InputRead %= MAX_INPUT_CHARS8;
532 // Encode the raw UTF-32 Key
533 ((Uint32*)term->InputBuffer)[ term->InputWrite ] = Codepoint;
535 term->InputWrite %= MAX_INPUT_CHARS32;
536 if(term->InputRead == term->InputWrite) {
538 term->InputRead %= MAX_INPUT_CHARS32;
544 * \fn void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
545 * \brief Print a string to the Virtual Terminal
547 void VT_int_PutString(tVTerm *Term, Uint8 *Buffer, Uint Count)
551 for( i = 0; i < Count; i++ )
553 if( Buffer[i] == 0x1B ) // Escape Sequence
556 i += VT_int_ParseEscape(Term, (char*)&Buffer[i]);
560 if( Buffer[i] < 128 ) // Plain ASCII
561 VT_int_PutChar(Term, Buffer[i]);
563 i += ReadUTF8(&Buffer[i], &val);
564 VT_int_PutChar(Term, val);
569 if( !(Term->Flags & VT_FLAG_HIDECSR) )
571 tVideo_IOCtl_Pos pos;
572 pos.x = Term->WritePos % Term->Width;
573 pos.y = Term->WritePos / Term->Width;
574 VFS_IOCtl(giVT_OutputDevHandle, VIDEO_IOCTL_SETCURSOR, &pos);
579 * \fn void VT_int_ClearLine(tVTerm *Term, int Num)
580 * \brief Clears a line in a virtual terminal
582 void VT_int_ClearLine(tVTerm *Term, int Num)
585 //ENTER("pTerm iNum", Term, Num);
586 for( i = Term->Width; i--; )
588 Term->Text[ Num*Term->Width + i ].Ch = 0;
589 Term->Text[ Num*Term->Width + i ].Colour = Term->CurColour;
595 * \fn int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
596 * \brief Parses a VT100 Escape code
598 int VT_int_ParseEscape(tVTerm *Term, char *Buffer)
603 int args[4] = {0,0,0,0};
611 while('0' <= c && c <= '9') {
616 if( j != 1 ) argc ++;
619 // Get string (what does this do?)
627 if( ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
633 if(argc == 1) tmp = args[0];
636 if( Term->WritePos-(tmp-1) % Term->Width == 0 )
637 Term->WritePos -= Term->WritePos % Term->Width;
639 Term->WritePos -= tmp;
640 Log("Left by %i", tmp);
645 if(argc == 1) tmp = args[0];
647 if( (Term->WritePos + tmp) % Term->Width == 0 ) {
648 Term->WritePos -= Term->WritePos % Term->Width;
649 Term->WritePos += Term->Width - 1;
651 Term->WritePos += tmp;
661 int i = Term->Height * VT_SCROLLBACK;
662 while( i-- ) VT_int_ClearLine(Term, i);
665 VT_int_UpdateScreen(Term, 1);
675 if( 0 <= args[argc] && args[argc] <= 8)
679 case 0: Term->CurColour = DEFAULT_COLOUR; break; // Reset
680 case 1: Term->CurColour |= 0x80000000; break; // Bright
681 case 2: Term->CurColour &= ~0x80000000; break; // Dim
685 else if(30 <= args[argc] && args[argc] <= 37) {
686 Term->CurColour &= 0xF000FFFF;
687 Term->CurColour |= (Uint32)caVT100Colours[ args[argc]-30+(Term->CurColour>>28) ] << 16;
690 else if(40 <= args[argc] && args[argc] <= 47) {
691 Term->CurColour &= 0xFFFF8000;
692 Term->CurColour |= caVT100Colours[ args[argc]-40+((Term->CurColour>>12)&15) ];
708 * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
709 * \brief Write a single character to a VTerm
711 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
714 //ENTER("pTerm xCh", Term, Ch);
715 //LOG("Term = {WritePos:%i, ViewPos:%i}\n", Term->WritePos, Term->ViewPos);
719 case '\0': return; // Ignore NULL byte
721 Term->WritePos += Term->Width;
723 Term->WritePos -= Term->WritePos % Term->Width;
728 Term->Text[ Term->WritePos ].Ch = '\0';
729 Term->Text[ Term->WritePos ].Colour = Term->CurColour;
731 } while(Term->WritePos & 7);
735 // Backspace is invalid at Offset 0
736 if(Term->WritePos == 0) break;
740 if(Term->Text[ Term->WritePos ].Ch != '\0') {
741 Term->Text[ Term->WritePos ].Ch = 0;
742 Term->Text[ Term->WritePos ].Colour = Term->CurColour;
746 i = 7; // Limit it to 8
748 Term->Text[ Term->WritePos ].Ch = 0;
749 Term->Text[ Term->WritePos ].Colour = Term->CurColour;
751 } while(Term->WritePos && i-- && Term->Text[ Term->WritePos ].Ch == '\0');
752 if(Term->Text[ Term->WritePos ].Ch != '\0')
757 Term->Text[ Term->WritePos ].Ch = Ch;
758 Term->Text[ Term->WritePos ].Colour = Term->CurColour;
765 if(Term->WritePos >= Term->Width*Term->Height*VT_SCROLLBACK)
768 Term->WritePos -= Term->Width;
770 // Update view position
771 base = Term->Width*Term->Height*(VT_SCROLLBACK-1);
772 if(Term->ViewPos < base) Term->ViewPos += Term->Width;
773 if(Term->ViewPos > base) Term->ViewPos = base;
775 // Scroll terminal cache
776 base = Term->Width*(Term->Height*VT_SCROLLBACK-1);
781 &Term->Text[Term->Width],
782 Term->Width*(Term->Height-1)*VT_SCROLLBACK*sizeof(tVT_Char)
786 for( i = 0; i < Term->Width; i ++ )
788 Term->Text[ base + i ].Ch = 0;
789 Term->Text[ base + i ].Colour = Term->CurColour;
792 VT_int_UpdateScreen( Term, 1 );
794 else if(Term->WritePos > Term->Width*Term->Height+Term->ViewPos)
796 Term->ViewPos += Term->Width;
797 VT_int_UpdateScreen( Term, 1 );
800 VT_int_UpdateScreen( Term, 0 );
806 * \fn void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
807 * \brief Updates the video framebuffer
809 void VT_int_UpdateScreen( tVTerm *Term, int UpdateAll )
813 giVT_OutputDevHandle,
815 Term->Width*Term->Height*sizeof(tVT_Char),
816 &Term->Text[Term->ViewPos]
819 int pos = Term->WritePos - Term->WritePos % Term->Width;
821 giVT_OutputDevHandle,
822 (pos - Term->ViewPos)*sizeof(tVT_Char),
823 Term->Width*sizeof(tVT_Char),
832 #define MONOSPACE_FONT 10816
834 #if MONOSPACE_FONT == 10808 // 8x8
835 # include "vterm_font_8x8.h"
836 #elif MONOSPACE_FONT == 10816 // 8x16
837 # include "vterm_font_8x16.h"
840 // === PROTOTYPES ===
841 Uint8 *VT_Font_GetChar(Uint32 Codepoint);
844 int giVT_CharWidth = FONT_WIDTH;
845 int giVT_CharHeight = FONT_HEIGHT;
849 * \fn void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Pitch, Uint32 BGC, Uint32 FGC)
850 * \brief Render a font character
852 void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Pitch, Uint32 BGC, Uint32 FGC)
855 Uint32 *buf = Buffer;
857 font = VT_Font_GetChar(Codepoint);
859 for(y = 0; y < FONT_HEIGHT; y ++)
861 for(x = 0; x < FONT_WIDTH; x ++)
863 if(*font & (1 << (FONT_WIDTH-x)))
874 * \fn Uint32 VT_Colour12to24(Uint16 Col12)
877 Uint32 VT_Colour12to24(Uint16 Col12)
882 ret = (tmp << 0) | (tmp << 4);
883 tmp = (Col12 & 0xF0) >> 4;
884 ret |= (tmp << 8) | (tmp << 12);
885 tmp = (Col12 & 0xF00) >> 8;
886 ret |= (tmp << 16) | (tmp << 20);
891 * \fn Uint8 *VT_Font_GetChar(Uint32 Codepoint)
892 * \brief Gets an index into the font array given a Unicode Codepoint
893 * \note See http://en.wikipedia.org/wiki/CP437
895 Uint8 *VT_Font_GetChar(Uint32 Codepoint)
899 return &VTermFont[Codepoint*FONT_HEIGHT];
902 case 0xC7: index = 128; break; // Ç
903 case 0xFC: index = 129; break; // ü
904 case 0xE9: index = 130; break; // é
905 case 0xE2: index = 131; break; // â
906 case 0xE4: index = 132; break; // ä
907 case 0xE0: index = 133; break; // à
908 case 0xE5: index = 134; break; // å
909 case 0xE7: index = 135; break; // ç
910 case 0xEA: index = 136; break; // ê
911 case 0xEB: index = 137; break; // ë
912 case 0xE8: index = 138; break; // è
913 case 0xEF: index = 139; break; // ï
914 case 0xEE: index = 140; break; // î
915 case 0xEC: index = 141; break; // ì
916 case 0xC4: index = 142; break; // Ä
917 case 0xC5: index = 143; break; // Å
920 return &VTermFont[index*FONT_HEIGHT];
923 EXPORTAS(&giVT_CharWidth, giVT_CharWidth);
924 EXPORTAS(&giVT_CharHeight, giVT_CharHeight);
925 EXPORT(VT_Font_Render);
926 EXPORT(VT_Colour12to24);