391 lines
8.9 KiB
C++
391 lines
8.9 KiB
C++
/*
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* \brief Char-cell-array-based implementation of a character screen
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* \author Norman Feske
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* \date 2013-01-20
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*/
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/*
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* Copyright (C) 2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _TERMINAL__CHAR_CELL_ARRAY_CHARACTER_SCREEN_H_
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#define _TERMINAL__CHAR_CELL_ARRAY_CHARACTER_SCREEN_H_
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/* terminal includes */
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#include <terminal/cell_array.h>
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#include <terminal/font_face.h>
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struct Char_cell
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{
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unsigned char attr;
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unsigned char ascii;
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unsigned char color;
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enum { ATTR_COLIDX_MASK = 0x07,
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ATTR_CURSOR = 0x10,
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ATTR_INVERSE = 0x20,
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ATTR_HIGHLIGHT = 0x40 };
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enum { COLOR_MASK = 0x3f }; /* 111111 */
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Char_cell() : attr(0), ascii(0), color(0) { }
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Char_cell(unsigned char c, Font_face f,
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int colidx, bool inv, bool highlight)
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:
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attr(f.attr_bits() | (inv ? ATTR_INVERSE : 0)
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| (highlight ? ATTR_HIGHLIGHT : 0)),
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ascii(c),
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color(colidx & COLOR_MASK)
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{ }
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Font_face font_face() const
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{
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return Font_face((Font_face::Type)(attr & Font_face::attr_mask()));
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}
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int colidx_fg() const { return color & ATTR_COLIDX_MASK; }
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int colidx_bg() const { return (color >> 3) & ATTR_COLIDX_MASK; }
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bool inverse() const { return attr & ATTR_INVERSE; }
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bool highlight() const { return attr & ATTR_HIGHLIGHT; }
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void set_cursor() { attr |= ATTR_CURSOR; }
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void clear_cursor() { attr &= ~ATTR_CURSOR; }
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bool has_cursor() const { return attr & ATTR_CURSOR; }
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};
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class Char_cell_array_character_screen : public Terminal::Character_screen
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{
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private:
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enum Cursor_visibility { CURSOR_INVISIBLE,
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CURSOR_VISIBLE,
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CURSOR_VERY_VISIBLE };
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Cell_array<Char_cell> &_char_cell_array;
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Terminal::Boundary _boundary;
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Terminal::Position _cursor_pos;
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/**
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* Color index contains the fg color in the first 3 bits
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* and the bg color in the second 3 bits (0bbbbfff).
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*/
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int _color_index;
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bool _inverse;
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bool _highlight;
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Cursor_visibility _cursor_visibility;
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int _region_start;
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int _region_end;
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int _tab_size;
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enum { DEFAULT_COLOR_INDEX_BG = 0, DEFAULT_COLOR_INDEX = 7, DEFAULT_TAB_SIZE = 8 };
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struct Cursor_guard
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{
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Char_cell_array_character_screen &cs;
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Terminal::Position old_cursor_pos;
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Cursor_guard(Char_cell_array_character_screen &cs)
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:
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cs(cs), old_cursor_pos(cs._cursor_pos)
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{
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/* temporarily remove cursor */
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cs._char_cell_array.cursor(old_cursor_pos, false);
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}
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~Cursor_guard()
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{
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/* restore original cursor */
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cs._char_cell_array.cursor(old_cursor_pos, true);
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/* if cursor position changed, move cursor */
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Terminal::Position &new_cursor_pos = cs._cursor_pos;
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if (old_cursor_pos != new_cursor_pos) {
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cs._char_cell_array.cursor(old_cursor_pos, false, true);
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cs._char_cell_array.cursor(new_cursor_pos, true, true);
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}
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}
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};
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public:
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Char_cell_array_character_screen(Cell_array<Char_cell> &char_cell_array)
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:
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_char_cell_array(char_cell_array),
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_boundary(_char_cell_array.num_cols(), _char_cell_array.num_lines()),
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_color_index(DEFAULT_COLOR_INDEX),
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_inverse(false),
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_highlight(false),
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_cursor_visibility(CURSOR_VISIBLE),
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_region_start(0),
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_region_end(_boundary.height - 1),
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_tab_size(DEFAULT_TAB_SIZE)
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{ }
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void _line_feed()
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{
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Cursor_guard guard(*this);
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_cursor_pos.y++;
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if (_cursor_pos.y > _region_end) {
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_char_cell_array.scroll_up(_region_start, _region_end);
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_cursor_pos.y = _region_end;
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}
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}
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void _carriage_return()
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{
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Cursor_guard guard(*this);
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_cursor_pos.x = 0;
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}
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/********************************
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** Character_screen interface **
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********************************/
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Terminal::Position cursor_pos() const { return _cursor_pos; }
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void output(Terminal::Character c)
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{
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if (c.ascii() > 0x10) {
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Cursor_guard guard(*this);
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_char_cell_array.set_cell(_cursor_pos.x, _cursor_pos.y,
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Char_cell(c.ascii(), Font_face::REGULAR,
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_color_index, _inverse, _highlight));
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_cursor_pos.x++;
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}
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switch (c.ascii()) {
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case '\r': /* 13 */
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_carriage_return();
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break;
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case '\n': /* 10 */
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_line_feed();
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_carriage_return();
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break;
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case 8: /* backspace */
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{
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Cursor_guard guard(*this);
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if (_cursor_pos.x > 0)
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_cursor_pos.x--;
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break;
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}
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case 9: /* tab */
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{
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Cursor_guard guard(*this);
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_cursor_pos.x += _tab_size - (_cursor_pos.x % _tab_size);
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break;
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}
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default:
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break;
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}
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if (_cursor_pos.x >= _boundary.width) {
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_carriage_return();
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_line_feed();
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}
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}
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void civis()
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{
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_cursor_visibility = CURSOR_INVISIBLE;
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}
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void cnorm()
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{
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_cursor_visibility = CURSOR_VISIBLE;
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}
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void cvvis()
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{
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_cursor_visibility = CURSOR_VERY_VISIBLE;
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}
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void cpr()
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{
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PDBG("not implemented");
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}
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void csr(int start, int end)
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{
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/* the arguments are specified use coordinate origin (1, 1) */
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start--;
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end--;
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_region_start = Genode::max(start, 0);
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_region_end = Genode::min(end, _boundary.height - 1);
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/* preserve invariant of region size >= 0 */
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_region_end = Genode::max(_region_end, _region_start);
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}
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void cuf(int dx)
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{
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Cursor_guard guard(*this);
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_cursor_pos.x += dx;
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_cursor_pos.x = Genode::min(_boundary.width - 1, _cursor_pos.x);
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}
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void cup(int y, int x)
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{
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Cursor_guard guard(*this);
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/* top-left cursor position is reported as (1, 1) */
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x--;
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y--;
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using namespace Genode;
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x = max(0, min(x, _boundary.width - 1));
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y = max(0, min(y, _boundary.height - 1));
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_cursor_pos = Terminal::Position(x, y);
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}
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void cuu1() { PWRN("not implemented"); }
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void dch(int) { PDBG("not implemented"); }
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void dl(int num_lines)
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{
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/* delete number of lines */
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for (int i = 0; i < num_lines; i++)
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_char_cell_array.scroll_up(_cursor_pos.y, _region_end);
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}
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void ech(int v)
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{
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Cursor_guard guard(*this);
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for (int i = 0; i < v; i++, _cursor_pos.x++)
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_char_cell_array.set_cell(_cursor_pos.x, _cursor_pos.y,
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Char_cell(' ', Font_face::REGULAR,
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_color_index, _inverse, _highlight));
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}
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void ed()
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{
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/* clear to end of screen */
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el();
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_char_cell_array.clear(_cursor_pos.y + 1, _boundary.height - 1);
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}
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void el()
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{
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/* clear to end of line */
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for (int x = _cursor_pos.x; x < _boundary.width; x++)
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_char_cell_array.set_cell(x, _cursor_pos.y, Char_cell());
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}
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void el1() { PDBG("not implemented"); }
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void home()
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{
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Cursor_guard guard(*this);
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_cursor_pos = Terminal::Position(0, 0);
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}
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void hpa(int x)
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{
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Cursor_guard guard(*this);
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_cursor_pos.x = x;
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_cursor_pos.x = Genode::min(_boundary.width - 1, _cursor_pos.x);
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}
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void hts() { PDBG("not implemented"); }
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void ich(int) { PDBG("not implemented"); }
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void il(int value)
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{
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Cursor_guard guard(*this);
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if (_cursor_pos.y > _region_end)
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return;
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_char_cell_array.cursor(_cursor_pos, false);
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for (int i = 0; i < value; i++)
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_char_cell_array.scroll_down(_cursor_pos.y, _region_end);
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_char_cell_array.cursor(_cursor_pos, true);
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}
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void oc() { PDBG("not implemented"); }
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void op()
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{
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_color_index = DEFAULT_COLOR_INDEX | (DEFAULT_COLOR_INDEX_BG << 3);
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}
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void rc() { PDBG("not implemented"); }
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void ri() { PDBG("not implemented"); }
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void ris() { PDBG("not implemented"); }
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void rmam() { PDBG("not implemented"); }
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void rmir() { PDBG("not implemented"); }
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void setab(int value)
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{
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//_inverse = (value != 0);
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_color_index &= ~0x38; /* clear 111000 */
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_color_index |= (((value == 9) ? DEFAULT_COLOR_INDEX_BG : value) << 3);
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}
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void setaf(int value)
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{
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_color_index &= ~0x7; /* clear 000111 */
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_color_index |= (value == 9) ? DEFAULT_COLOR_INDEX : value;
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}
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void sgr(int value)
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{
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_highlight = (value & 0x1) != 0;
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_inverse = (value & 0x2) != 0;
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/* sgr 0 is the command to reset all attributes, including color */
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if (value == 0)
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_color_index = DEFAULT_COLOR_INDEX | (DEFAULT_COLOR_INDEX_BG << 3);
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}
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void sgr0()
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{
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sgr(0);
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}
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void sc() { PDBG("not implemented"); }
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void smam() { PDBG("not implemented"); }
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void smir() { PDBG("not implemented"); }
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void tbc() { PDBG("not implemented"); }
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void u6(int, int) { PDBG("not implemented"); }
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void u7() { PDBG("not implemented"); }
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void u8() { PDBG("not implemented"); }
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void u9() { PDBG("not implemented"); }
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void vpa(int y)
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{
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Cursor_guard guard(*this);
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_cursor_pos.y = y;
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_cursor_pos.y = Genode::min(_boundary.height - 1, _cursor_pos.y);
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}
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};
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#endif /* _TERMINAL__CHAR_CELL_ARRAY_CHARACTER_SCREEN_H_ */
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