308 lines
8.9 KiB
C++
308 lines
8.9 KiB
C++
/*
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* \brief Terminal service
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* \author Norman Feske
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* \date 2011-08-11
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*/
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/*
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* Copyright (C) 2011-2019 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 Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/component.h>
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#include <base/log.h>
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#include <base/heap.h>
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#include <framebuffer_session/connection.h>
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#include <input_session/connection.h>
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#include <timer_session/connection.h>
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#include <base/attached_rom_dataspace.h>
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#include <base/attached_ram_dataspace.h>
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#include <input/event.h>
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#include <gems/vfs.h>
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#include <gems/vfs_font.h>
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#include <gems/cached_font.h>
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/* terminal includes */
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#include <terminal/decoder.h>
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#include <terminal/types.h>
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/* local includes */
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#include "text_screen_surface.h"
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#include "session.h"
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namespace Terminal { struct Main; }
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struct Terminal::Main : Character_consumer
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{
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/*
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* Noncopyable
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*/
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Main(Main const &);
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Main &operator = (Main const &);
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Env &_env;
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Attached_rom_dataspace _config { _env, "config" };
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Heap _heap { _env.ram(), _env.rm() };
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Root_directory _root_dir { _env, _heap, _config.xml().sub_node("vfs") };
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Cached_font::Limit _font_cache_limit { 0 };
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struct Font
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{
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Vfs_font _vfs_font;
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Cached_font _cached_font;
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Font(Allocator &alloc, Directory &root_dir, Cached_font::Limit limit)
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:
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_vfs_font(alloc, root_dir, "fonts/monospace/regular"),
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_cached_font(alloc, _vfs_font, limit)
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{ }
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Text_painter::Font const &font() const { return _cached_font; }
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};
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Constructible<Font> _font { };
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Color_palette _color_palette { };
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void _handle_config();
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Signal_handler<Main> _config_handler {
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_env.ep(), *this, &Main::_handle_config };
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Input::Connection _input { _env };
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Timer::Connection _timer { _env };
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Framebuffer _framebuffer { _env, _config_handler };
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typedef Pixel_rgb565 PT;
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Constructible<Text_screen_surface<PT>> _text_screen_surface { };
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Area _terminal_size { };
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/*
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* Time in milliseconds between a change of the terminal content and the
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* update of the pixels. By delaying the update, multiple intermediate
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* changes result in only one rendering step.
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*/
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Genode::uint64_t const _flush_delay = 5;
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bool _flush_scheduled = false;
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void _handle_flush()
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{
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_flush_scheduled = false;
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if (_text_screen_surface.constructed())
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_text_screen_surface->redraw();
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}
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Signal_handler<Main> _flush_handler {
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_env.ep(), *this, &Main::_handle_flush };
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void _schedule_flush()
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{
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if (!_flush_scheduled) {
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_timer.trigger_once((Genode::uint64_t)1000*_flush_delay);
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_flush_scheduled = true;
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}
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}
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/**
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* Character_consumer interface, called from 'Terminal::Session_component'
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*/
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void consume_character(Character c) override
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{
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// XXX distinguish between normal and alternative display mode (smcup)
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if (_text_screen_surface.constructed())
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_text_screen_surface->apply_character(c);
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_schedule_flush();
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}
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/* input read buffer */
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Read_buffer _read_buffer { };
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/* create root interface for service */
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Root_component _root { _env, _heap, _read_buffer, *this };
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void _handle_input();
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Signal_handler<Main> _input_handler {
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_env.ep(), *this, &Main::_handle_input };
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Main(Env &env) : _env(env)
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{
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_timer .sigh(_flush_handler);
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_config.sigh(_config_handler);
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_input .sigh(_input_handler);
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_handle_config();
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/* announce service at our parent */
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_env.parent().announce(_env.ep().manage(_root));
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}
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};
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void Terminal::Main::_handle_config()
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{
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_config.update();
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Xml_node const config = _config.xml();
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_color_palette.apply_config(config);
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_font.destruct();
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_root_dir.apply_config(config.sub_node("vfs"));
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Cached_font::Limit const cache_limit {
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config.attribute_value("cache", Number_of_bytes(256*1024)) };
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_font.construct(_heap, _root_dir, cache_limit);
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/*
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* Adapt terminal to font or framebuffer mode changes
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*/
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_framebuffer.switch_to_new_mode();
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/*
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* Distinguish the case where the framebuffer change affects the character
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* grid size from the case where merely the pixel position of the character
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* grid within the framebuffer changed.
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*
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* In the former case, the text-screen surface is reallocated and cleared.
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* Clients (like ncurses) are expected to respond to a terminal-size change
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* with a redraw. In the latter case, the client would skip the redraw. So
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* we need to preserve the content and just reposition the character grid.
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*/
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try {
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Text_screen_surface<PT>::Geometry const new_geometry(_font->font(), _framebuffer);
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bool const reconstruct = !_text_screen_surface.constructed() ||
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_text_screen_surface->size() != new_geometry.size();
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if (reconstruct) {
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typedef Text_screen_surface<PT>::Snapshot Snapshot;
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Constructible<Snapshot> snapshot { };
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size_t const snapshot_bytes = _text_screen_surface.constructed()
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? Snapshot::bytes_needed(*_text_screen_surface)
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: 0,
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preserved_bytes = 32*1024,
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needed_bytes = snapshot_bytes + preserved_bytes,
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avail_bytes = _env.pd().avail_ram().value;
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bool const preserve_content = (needed_bytes < avail_bytes);
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if (!preserve_content)
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warning("not enough spare RAM to preserve content (",
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"need ", Genode::Number_of_bytes(needed_bytes), ", "
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"have ", Genode::Number_of_bytes(avail_bytes), ")");
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if (preserve_content && _text_screen_surface.constructed())
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snapshot.construct(_heap, *_text_screen_surface);
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Position const orig_cursor_pos = _text_screen_surface.constructed()
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? _text_screen_surface->cursor_pos()
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: Position();
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_text_screen_surface.construct(_heap, _font->font(),
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_color_palette, _framebuffer);
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if (snapshot.constructed())
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_text_screen_surface->import(*snapshot);
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_text_screen_surface->cursor_pos(orig_cursor_pos);
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_terminal_size = _text_screen_surface->size();
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} else {
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_text_screen_surface->geometry(new_geometry);
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}
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}
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catch (Text_screen_surface<PT>::Geometry::Invalid) {
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/*
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* Make sure to never operate on an invalid-sized framebuffer
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*
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* If the exception is thrown by the construction of 'new_geometry',
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* there may still be a stale '_text_screen_surface'.
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*/
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_text_screen_surface.destruct();
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_terminal_size = Area(0, 0);
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}
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_root.notify_resized(Session::Size(_terminal_size.w(), _terminal_size.h()));
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_schedule_flush();
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}
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void Terminal::Main::_handle_input()
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{
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_input.for_each_event([&] (Input::Event const &event) {
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event.handle_press([&] (Input::Keycode, Codepoint codepoint) {
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/* function-key unicodes */
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enum {
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CODEPOINT_UP = 0xf700, CODEPOINT_DOWN = 0xf701,
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CODEPOINT_LEFT = 0xf702, CODEPOINT_RIGHT = 0xf703,
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CODEPOINT_F1 = 0xf704, CODEPOINT_F2 = 0xf705,
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CODEPOINT_F3 = 0xf706, CODEPOINT_F4 = 0xf707,
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CODEPOINT_F5 = 0xf708, CODEPOINT_F6 = 0xf709,
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CODEPOINT_F7 = 0xf70a, CODEPOINT_F8 = 0xf70b,
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CODEPOINT_F9 = 0xf70c, CODEPOINT_F10 = 0xf70d,
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CODEPOINT_F11 = 0xf70e, CODEPOINT_F12 = 0xf70f,
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CODEPOINT_HOME = 0xf729, CODEPOINT_INSERT = 0xf727,
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CODEPOINT_DELETE = 0xf728, CODEPOINT_END = 0xf72b,
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CODEPOINT_PAGEUP = 0xf72c, CODEPOINT_PAGEDOWN = 0xf72d,
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};
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char const *special_sequence = nullptr;
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switch (codepoint.value) {
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case CODEPOINT_UP: special_sequence = "\EOA"; break;
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case CODEPOINT_DOWN: special_sequence = "\EOB"; break;
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case CODEPOINT_LEFT: special_sequence = "\EOD"; break;
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case CODEPOINT_RIGHT: special_sequence = "\EOC"; break;
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case CODEPOINT_F1: special_sequence = "\EOP"; break;
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case CODEPOINT_F2: special_sequence = "\EOQ"; break;
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case CODEPOINT_F3: special_sequence = "\EOR"; break;
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case CODEPOINT_F4: special_sequence = "\EOS"; break;
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case CODEPOINT_F5: special_sequence = "\E[15~"; break;
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case CODEPOINT_F6: special_sequence = "\E[17~"; break;
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case CODEPOINT_F7: special_sequence = "\E[18~"; break;
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case CODEPOINT_F8: special_sequence = "\E[19~"; break;
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case CODEPOINT_F9: special_sequence = "\E[20~"; break;
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case CODEPOINT_F10: special_sequence = "\E[21~"; break;
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case CODEPOINT_F11: special_sequence = "\E[23~"; break;
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case CODEPOINT_F12: special_sequence = "\E[24~"; break;
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case CODEPOINT_HOME: special_sequence = "\E[1~"; break;
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case CODEPOINT_INSERT: special_sequence = "\E[2~"; break;
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case CODEPOINT_DELETE: special_sequence = "\E[3~"; break;
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case CODEPOINT_END: special_sequence = "\E[4~"; break;
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case CODEPOINT_PAGEUP: special_sequence = "\E[5~"; break;
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case CODEPOINT_PAGEDOWN: special_sequence = "\E[6~"; break;
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};
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if (special_sequence)
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_read_buffer.add(special_sequence);
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else
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_read_buffer.add(codepoint);
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});
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});
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}
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void Component::construct(Genode::Env &env) { static Terminal::Main main(env); }
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