I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
211 lines
4.7 KiB
C++
211 lines
4.7 KiB
C++
/*
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* Copyright (c) 2012, 2013, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* vgatextbuffer.cpp
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* An indexable text buffer with the VGA text mode framebuffer as backend.
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*/
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#include <sortix/vga.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/refcount.h>
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#include <sortix/kernel/textbuffer.h>
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#include "vga.h"
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#include "vgatextbuffer.h"
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namespace Sortix {
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VGATextBuffer::VGATextBuffer(uint16_t* vga, TextChar* chars,
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size_t width, size_t height)
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{
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this->vga = vga;
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this->chars = chars;
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this->width = width;
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this->height = height;
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cursorpos = {0, 0};
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cursorenabled = true;
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UpdateCursor();
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}
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VGATextBuffer::~VGATextBuffer()
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{
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}
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static uint16_t CharToTextEntry(TextChar c)
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{
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int remap = VGA::MapWideToVGAFont(c.c);
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if ( remap < 0 )
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remap = 0 /* replacement character */;
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if ( c.attr & ATTR_BOLD )
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c.vgacolor |= 0x08;
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return (uint16_t) remap | (uint16_t) c.vgacolor << 8U;
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}
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bool VGATextBuffer::UsablePosition(TextPos pos) const
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{
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return pos.x < width && pos.y < height;
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}
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TextPos VGATextBuffer::CropPosition(TextPos pos) const
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{
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if ( width <= pos.x )
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pos.x = width - 1;
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if ( height <= pos.y )
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pos.y = height -1;
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return pos;
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}
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size_t VGATextBuffer::OffsetOfPos(TextPos pos) const
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{
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return pos.y * width + pos.x;
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}
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size_t VGATextBuffer::Width() const
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{
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return width;
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}
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size_t VGATextBuffer::Height() const
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{
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return height;
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}
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TextChar VGATextBuffer::GetChar(TextPos pos) const
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{
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if ( UsablePosition(pos) )
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return chars[OffsetOfPos(pos)];
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return {0, 0, 0};
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}
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void VGATextBuffer::SetChar(TextPos pos, TextChar c)
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{
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if ( UsablePosition(pos) )
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{
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chars[OffsetOfPos(pos)] = c;
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vga[OffsetOfPos(pos)] = CharToTextEntry(c);
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}
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}
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void VGATextBuffer::Scroll(ssize_t off, TextChar fillwith)
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{
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if ( !off )
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return;
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bool neg = 0 < off;
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size_t absoff = off < 0 ? -off : off;
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if ( height < absoff )
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absoff = height;
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TextPos scrollfrom = neg ? TextPos{0, absoff} : TextPos{0, 0};
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TextPos scrollto = neg ? TextPos{0, 0} : TextPos{0, absoff};
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TextPos fillfrom = neg ? TextPos{0, height-absoff} : TextPos{0, 0};
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TextPos fillto = neg ? TextPos{width-1, height-1} : TextPos{width-1, absoff-1};
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size_t scrollchars = width * (height-absoff);
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Move(scrollto, scrollfrom, scrollchars);
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Fill(fillfrom, fillto, fillwith);
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}
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void VGATextBuffer::Move(TextPos to, TextPos from, size_t numchars)
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{
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size_t dest = OffsetOfPos(CropPosition(to));
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size_t src = OffsetOfPos(CropPosition(from));
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if ( dest < src )
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{
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for ( size_t i = 0; i < numchars; i++ )
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{
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chars[dest + i] = chars[src + i];
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vga[dest + i] = CharToTextEntry(chars[dest + i]);
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}
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}
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else if ( src < dest )
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{
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for ( size_t i = 0; i < numchars; i++ )
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{
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chars[dest + numchars-1 - i] = chars[src + numchars-1 - i];
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vga[dest + numchars-1 - i] = CharToTextEntry(chars[dest + numchars-1 - i]);
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}
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}
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}
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void VGATextBuffer::Fill(TextPos from, TextPos to, TextChar fillwith)
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{
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from = CropPosition(from);
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to = CropPosition(to);
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size_t start = OffsetOfPos(from);
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size_t end = OffsetOfPos(to);
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uint16_t entry = CharToTextEntry(fillwith);
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for ( size_t i = start; i <= end; i++ )
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{
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chars[i] = fillwith;
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vga[i] = entry;
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}
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}
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bool VGATextBuffer::GetCursorEnabled() const
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{
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return cursorenabled;
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}
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void VGATextBuffer::SetCursorEnabled(bool enablecursor)
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{
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cursorenabled = enablecursor;
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UpdateCursor();
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}
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TextPos VGATextBuffer::GetCursorPos() const
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{
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return cursorpos;
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}
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void VGATextBuffer::SetCursorPos(TextPos cursorpos)
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{
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this->cursorpos = cursorpos;
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UpdateCursor();
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}
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void VGATextBuffer::UpdateCursor()
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{
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if ( cursorenabled )
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VGA::SetCursor(cursorpos.x, cursorpos.y);
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else
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VGA::SetCursor(width, height-1);
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}
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void VGATextBuffer::SpawnThreads()
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{
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}
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void VGATextBuffer::Invalidate()
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{
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}
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bool VGATextBuffer::EmergencyIsImpaired()
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{
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return false;
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}
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bool VGATextBuffer::EmergencyRecoup()
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{
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return true;
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}
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void VGATextBuffer::EmergencyReset()
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{
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Fill(TextPos{0, 0}, TextPos{width-1, height-1}, TextChar{0, 0, 0});
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SetCursorPos(TextPos{0, 0});
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}
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} // namespace Sortix
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