3 * - By John Hodge (thePowersGang)
6 * - Virtual Terminal - Terminal buffer manipulation
13 * \fn void VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count)
14 * \brief Print a string to the Virtual Terminal
16 void VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count)
22 for( i = 0; i < Count; i++ )
24 // Handle escape sequences
25 if( Buffer[i] == 0x1B )
28 i += VT_int_ParseEscape(Term, (const char*)&Buffer[i]) - 1;
32 // Fast check for non UTF-8
33 if( Buffer[i] < 128 ) // Plain ASCII
34 VT_int_PutChar(Term, Buffer[i]);
36 i += ReadUTF8(&Buffer[i], &val) - 1;
37 VT_int_PutChar(Term, val);
41 VT_int_UpdateScreen( Term, 0 );
45 * \fn void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
46 * \brief Write a single character to a VTerm
48 void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
54 if(Term->Flags & VT_FLAG_ALTBUF) {
55 buffer = Term->AltBuf;
56 write_pos = Term->AltWritePos;
60 write_pos = Term->WritePos;
65 case '\0': return; // Ignore NULL byte
67 VT_int_UpdateScreen( Term, 0 ); // Update the line before newlining
68 write_pos += Term->TextWidth;
70 write_pos -= write_pos % Term->TextWidth;
73 case '\t': { int tmp = write_pos / Term->TextWidth;
74 write_pos %= Term->TextWidth;
76 buffer[ write_pos ].Ch = '\0';
77 buffer[ write_pos ].Colour = Term->CurColour;
79 } while(write_pos & 7);
80 write_pos += tmp * Term->TextWidth;
84 // Backspace is invalid at Offset 0
85 if(write_pos == 0) break;
89 if(buffer[ write_pos ].Ch != '\0') {
90 buffer[ write_pos ].Ch = 0;
91 buffer[ write_pos ].Colour = Term->CurColour;
95 i = 7; // Limit it to 8
97 buffer[ write_pos ].Ch = 0;
98 buffer[ write_pos ].Colour = Term->CurColour;
100 } while(write_pos && i-- && buffer[ write_pos ].Ch == '\0');
101 if(buffer[ write_pos ].Ch != '\0')
106 buffer[ write_pos ].Ch = Ch;
107 buffer[ write_pos ].Colour = Term->CurColour;
108 // Update the line before wrapping
109 if( (write_pos + 1) % Term->TextWidth == 0 )
110 VT_int_UpdateScreen( Term, 0 );
115 if(Term->Flags & VT_FLAG_ALTBUF)
117 Term->AltBuf = buffer;
118 Term->AltWritePos = write_pos;
120 if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
122 Term->AltWritePos -= Term->TextWidth;
123 VT_int_ScrollText(Term, 1);
130 Term->WritePos = write_pos;
132 // - Check if we need to scroll the entire scrollback buffer
133 if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
137 // Update previous line
138 Term->WritePos -= Term->TextWidth;
139 VT_int_UpdateScreen( Term, 0 );
141 // Update view position
142 base = Term->TextWidth*Term->TextHeight*(giVT_Scrollback);
143 if(Term->ViewPos < base)
144 Term->ViewPos += Term->Width;
145 if(Term->ViewPos > base)
146 Term->ViewPos = base;
148 VT_int_ScrollText(Term, 1);
150 // Ok, so we only need to scroll the screen
151 else if(Term->WritePos >= Term->ViewPos + Term->TextWidth*Term->TextHeight)
153 // Update the last line
154 Term->WritePos -= Term->TextWidth;
155 VT_int_UpdateScreen( Term, 0 );
156 Term->WritePos += Term->TextWidth;
158 VT_int_ScrollText(Term, 1);
160 Term->ViewPos += Term->TextWidth;
167 void VT_int_ScrollText(tVTerm *Term, int Count)
170 int height, init_write_pos;
172 int scroll_top, scroll_height;
174 // Get buffer pointer and attributes
175 if( Term->Flags & VT_FLAG_ALTBUF )
178 height = Term->TextHeight;
179 init_write_pos = Term->AltWritePos;
180 scroll_top = Term->ScrollTop;
181 scroll_height = Term->ScrollHeight;
186 height = Term->TextHeight*(giVT_Scrollback+1);
187 init_write_pos = Term->WritePos;
189 scroll_height = height;
192 // Scroll text downwards
198 if(Count > scroll_height) Count = scroll_height;
199 base = Term->TextWidth*(scroll_top + scroll_height - Count);
200 len = Term->TextWidth*(scroll_height - Count);
202 // Scroll terminal cache
204 &buf[Term->TextWidth*scroll_top],
205 &buf[Term->TextWidth*(scroll_top+Count)],
209 for( i = 0; i < Term->TextWidth*Count; i ++ )
211 buf[ base + i ].Ch = 0;
212 buf[ base + i ].Colour = Term->CurColour;
216 VT_int_ScrollFramebuffer( Term, Count );
217 if( Term->Flags & VT_FLAG_ALTBUF )
218 Term->AltWritePos = base;
220 Term->WritePos = Term->ViewPos + Term->TextWidth*(Term->TextHeight - Count);
221 for( i = 0; i < Count; i ++ )
223 VT_int_UpdateScreen( Term, 0 );
224 if( Term->Flags & VT_FLAG_ALTBUF )
225 Term->AltWritePos += Term->TextWidth;
227 Term->WritePos += Term->TextWidth;
233 if(Count > scroll_height) Count = scroll_height;
235 len = Term->TextWidth*(scroll_height - Count);
237 // Scroll terminal cache
239 &buf[Term->TextWidth*(scroll_top+Count)],
240 &buf[Term->TextWidth*scroll_top],
243 // Clear preceding rows
244 for( i = 0; i < Term->TextWidth*Count; i ++ )
247 buf[ i ].Colour = Term->CurColour;
250 VT_int_ScrollFramebuffer( Term, -Count );
251 if( Term->Flags & VT_FLAG_ALTBUF )
252 Term->AltWritePos = Term->TextWidth*scroll_top;
254 Term->WritePos = Term->ViewPos;
255 for( i = 0; i < Count; i ++ )
257 VT_int_UpdateScreen( Term, 0 );
258 if( Term->Flags & VT_FLAG_ALTBUF )
259 Term->AltWritePos += Term->TextWidth;
261 Term->WritePos += Term->TextWidth;
265 if( Term->Flags & VT_FLAG_ALTBUF )
266 Term->AltWritePos = init_write_pos;
268 Term->WritePos = init_write_pos;
272 * \brief Clears a line in a virtual terminal
273 * \param Term Terminal to modify
274 * \param Num Line number to clear
276 void VT_int_ClearLine(tVTerm *Term, int Num)
281 if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) ) return ;
283 cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
284 cell = &cell[ Num*Term->TextWidth ];
286 for( i = Term->TextWidth; i--; )
289 cell[ i ].Colour = Term->CurColour;
294 * \brief Update the screen mode
295 * \param Term Terminal to update
296 * \param NewMode New mode to set
297 * \param NewWidth New framebuffer width
298 * \param NewHeight New framebuffer height
300 void VT_int_ChangeMode(tVTerm *Term, int NewMode, int NewWidth, int NewHeight)
302 int oldW = Term->Width;
303 int oldTW = Term->TextWidth;
304 int oldH = Term->Height;
305 int oldTH = Term->TextHeight;
306 tVT_Char *oldTBuf = Term->Text;
307 Uint32 *oldFB = Term->Buffer;
310 // TODO: Increase RealWidth/RealHeight when this happens
311 if(NewWidth > giVT_RealWidth) NewWidth = giVT_RealWidth;
312 if(NewHeight > giVT_RealHeight) NewHeight = giVT_RealHeight;
314 Term->Mode = NewMode;
316 // Fast exit if no resolution change
317 if(NewWidth == Term->Width && NewHeight == Term->Height)
320 // Calculate new dimensions
321 Term->Width = NewWidth;
322 Term->Height = NewHeight;
323 Term->TextWidth = NewWidth / giVT_CharWidth;
324 Term->TextHeight = NewHeight / giVT_CharHeight;
325 Term->ScrollHeight = Term->TextHeight - (oldTH - Term->ScrollHeight) - Term->ScrollTop;
327 // Allocate new buffers
330 Term->TextWidth * Term->TextHeight * (giVT_Scrollback+1),
335 w = (oldTW > Term->TextWidth) ? Term->TextWidth : oldTW;
336 h = (oldTH > Term->TextHeight) ? Term->TextHeight : oldTH;
337 h *= giVT_Scrollback + 1;
338 for( i = 0; i < h; i ++ )
341 &Term->Text[i*Term->TextWidth],
350 Term->AltBuf = realloc(
352 Term->TextWidth * Term->TextHeight * sizeof(tVT_Char)
357 Term->Buffer = calloc( Term->Width * Term->Height, sizeof(Uint32) );
359 w = (oldW > Term->Width) ? Term->Width : oldW;
360 h = (oldH > Term->Height) ? Term->Height : oldH;
361 for( i = 0; i < h; i ++ )
364 &Term->Buffer[i*Term->Width],
376 Log_Log("VTerm", "Set VT %p to text mode (%ix%i)",
377 Term, Term->TextWidth, Term->TextHeight);
380 Log_Log("VTerm", "Set VT %p to framebuffer mode (%ix%i)",
381 Term, Term->Width, Term->Height);
383 //case TERM_MODE_2DACCEL:
384 //case TERM_MODE_3DACCEL:
390 void VT_int_ToggleAltBuffer(tVTerm *Term, int Enabled)
393 Term->Flags |= VT_FLAG_ALTBUF;
395 Term->Flags &= ~VT_FLAG_ALTBUF;
396 VT_int_UpdateScreen(Term, 1);