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genode/gems/src/server/terminal/main.cc

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/*
* \brief Terminal service
* \author Norman Feske
* \date 2011-08-11
*/
/*
* Copyright (C) 2011-2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
/* Genode includes */
#include <base/env.h>
#include <base/printf.h>
#include <base/heap.h>
#include <framebuffer_session/connection.h>
#include <input_session/connection.h>
#include <timer_session/connection.h>
#include <cap_session/connection.h>
#include <root/component.h>
#include <os/attached_ram_dataspace.h>
#include <input/event.h>
#include <os/config.h>
/* terminal includes */
#include <terminal/decoder.h>
#include <terminal/types.h>
#include <terminal/scancode_tracker.h>
#include <terminal/keymaps.h>
#include <terminal/char_cell_array_character_screen.h>
#include <terminal_session/terminal_session.h>
/* nitpicker graphic back end */
#include <nitpicker_gfx/font.h>
#include <nitpicker_gfx/color.h>
#include <nitpicker_gfx/pixel_rgb565.h>
static bool const verbose = false;
inline Pixel_rgb565 blend(Pixel_rgb565 src, int alpha)
{
Pixel_rgb565 res;
res.pixel = ((((alpha >> 3) * (src.pixel & 0xf81f)) >> 5) & 0xf81f)
| ((( alpha * (src.pixel & 0x07c0)) >> 8) & 0x07c0);
return res;
}
inline Pixel_rgb565 mix(Pixel_rgb565 p1, Pixel_rgb565 p2, int alpha)
{
Pixel_rgb565 res;
/*
* We substract the alpha from 264 instead of 255 to
* compensate the brightness loss caused by the rounding
* error of the blend function when having only 5 bits
* per channel.
*/
res.pixel = blend(p1, 264 - alpha).pixel + blend(p2, alpha).pixel;
return res;
}
static Color color_palette[2*8];
static Color foreground_color(Char_cell const &cell)
{
Color col = color_palette[cell.colidx_fg() + (cell.highlight() ? 8 : 0)];
if (cell.inverse())
col = Color(col.r/2, col.g/2, col.b/2);
return col;
}
static Color background_color(Char_cell const &cell)
{
Color col = color_palette[cell.colidx_bg() + (cell.highlight() ? 8 : 0)];
if (cell.inverse())
return Color((col.r + 255)/2, (col.g + 255)/2, (col.b + 255)/2);
return col;
}
class Font_family
{
private:
Font const &_regular;
public:
Font_family(Font const &regular /* ...to be extended */ )
: _regular(regular) { }
/**
* Return font for specified face
*
* For now, we do not support font faces other than regular.
*/
Font const *font(Font_face) const { return &_regular; }
unsigned cell_width() const { return _regular.str_w("m"); }
unsigned cell_height() const { return _regular.str_h("m"); }
};
template <typename PT>
inline void draw_glyph(Color fg_color,
Color bg_color,
const unsigned char *glyph_base,
unsigned glyph_width,
unsigned glyph_img_width,
unsigned glyph_img_height,
unsigned cell_width,
PT *fb_base,
unsigned fb_width)
{
PT fg_pixel(fg_color.r, fg_color.g, fg_color.b);
PT bg_pixel(bg_color.r, bg_color.g, bg_color.b);
unsigned const horizontal_gap = cell_width
- Genode::min(glyph_width, cell_width);
unsigned const left_gap = horizontal_gap / 2;
unsigned const right_gap = horizontal_gap - left_gap;
/*
* Clear gaps to the left and right of the character if the character's
* with is smaller than the cell width.
*/
if (horizontal_gap) {
PT *line = fb_base;
for (unsigned y = 0 ; y < glyph_img_height; y++, line += fb_width) {
for (unsigned x = 0; x < left_gap; x++)
line[x] = bg_pixel;
for (unsigned x = cell_width - right_gap; x < cell_width; x++)
line[x] = bg_pixel;
}
}
/* center glyph horizontally within its cell */
fb_base += left_gap;
for (unsigned y = 0 ; y < glyph_img_height; y++) {
for (unsigned x = 0; x < glyph_width; x++)
fb_base[x] = mix(bg_pixel, fg_pixel, glyph_base[x]);
fb_base += fb_width;
glyph_base += glyph_img_width;
}
}
template <typename PT>
static void convert_char_array_to_pixels(Cell_array<Char_cell> *cell_array,
PT *fb_base,
unsigned fb_width,
unsigned fb_height,
Font_family const &font_family)
{
Font const &regular_font = *font_family.font(Font_face::REGULAR);
unsigned glyph_height = regular_font.img_h,
glyph_step_x = regular_font.wtab['m'];
unsigned y = 0;
for (unsigned line = 0; line < cell_array->num_lines(); line++) {
if (cell_array->line_dirty(line)) {
if (verbose)
Genode::printf("convert line %d\n", line);
unsigned x = 0;
for (unsigned column = 0; column < cell_array->num_cols(); column++) {
Char_cell cell = cell_array->get_cell(column, line);
Font const *font = font_family.font(cell.font_face());
unsigned char ascii = cell.ascii;
if (ascii == 0)
ascii = ' ';
unsigned char const *glyph_base = font->img + font->otab[ascii];
unsigned glyph_width = regular_font.wtab[ascii];
if (x + glyph_width >= fb_width) break;
Color fg_color = foreground_color(cell);
Color bg_color = background_color(cell);
if (cell.has_cursor()) {
fg_color = Color( 63, 63, 63);
bg_color = Color(255, 255, 255);
}
draw_glyph<PT>(fg_color, bg_color,
glyph_base, glyph_width,
(unsigned)font->img_w, (unsigned)font->img_h,
glyph_step_x, fb_base + x, fb_width);
x += glyph_step_x;
}
}
y += glyph_height;
fb_base += fb_width*glyph_height;
if (y + glyph_height > fb_height) break;
}
}
namespace Terminal {
struct Flush_callback : Genode::List<Flush_callback>::Element
{
virtual void flush() = 0;
};
struct Flush_callback_registry
{
Genode::List<Flush_callback> _list;
Genode::Lock _lock;
void add(Flush_callback *flush_callback)
{
Genode::Lock::Guard guard(_lock);
_list.insert(flush_callback);
}
void remove(Flush_callback *flush_callback)
{
Genode::Lock::Guard guard(_lock);
_list.remove(flush_callback);
}
void flush()
{
Genode::Lock::Guard guard(_lock);
Flush_callback *curr = _list.first();
for (; curr; curr = curr->next())
curr->flush();
}
};
class Session_component : public Genode::Rpc_object<Session, Session_component>,
public Flush_callback
{
private:
Read_buffer *_read_buffer;
Framebuffer::Session *_framebuffer;
Flush_callback_registry &_flush_callback_registry;
Genode::Attached_ram_dataspace _io_buffer;
Framebuffer::Mode _fb_mode;
Genode::Dataspace_capability _fb_ds_cap;
unsigned _char_width;
unsigned _char_height;
unsigned _columns;
unsigned _lines;
void *_fb_addr;
/**
* Protect '_char_cell_array'
*/
Genode::Lock _lock;
Cell_array<Char_cell> _char_cell_array;
Char_cell_array_character_screen _char_cell_array_character_screen;
Terminal::Decoder _decoder;
Terminal::Position _last_cursor_pos;
Font_family const *_font_family;
/**
* Initialize framebuffer-related attributes
*/
Genode::Dataspace_capability _init_fb()
{
if (_fb_mode.format() != Framebuffer::Mode::RGB565) {
PERR("Color mode %d not supported", _fb_mode.format());
return Genode::Dataspace_capability();
}
return _framebuffer->dataspace();
}
public:
/**
* Constructor
*/
Session_component(Read_buffer *read_buffer,
Framebuffer::Session *framebuffer,
Genode::size_t io_buffer_size,
Flush_callback_registry &flush_callback_registry,
Font_family const &font_family)
:
_read_buffer(read_buffer), _framebuffer(framebuffer),
_flush_callback_registry(flush_callback_registry),
_io_buffer(Genode::env()->ram_session(), io_buffer_size),
_fb_mode(_framebuffer->mode()),
_fb_ds_cap(_init_fb()),
/* take size of space character as character cell size */
_char_width(font_family.cell_width()),
_char_height(font_family.cell_height()),
/* compute number of characters fitting on the framebuffer */
_columns(_fb_mode.width()/_char_width),
_lines(_fb_mode.height()/_char_height),
_fb_addr(Genode::env()->rm_session()->attach(_fb_ds_cap)),
_char_cell_array(_columns, _lines, Genode::env()->heap()),
_char_cell_array_character_screen(_char_cell_array),
_decoder(_char_cell_array_character_screen),
_font_family(&font_family)
{
using namespace Genode;
printf("new terminal session:\n");
printf(" framebuffer has %dx%d pixels\n", _fb_mode.width(), _fb_mode.height());
printf(" character size is %dx%d pixels\n", _char_width, _char_height);
printf(" terminal size is %dx%d characters\n", _columns, _lines);
framebuffer->refresh(0, 0, _fb_mode.width(), _fb_mode.height());
_flush_callback_registry.add(this);
}
~Session_component()
{
_flush_callback_registry.remove(this);
}
void flush()
{
Genode::Lock::Guard guard(_lock);
convert_char_array_to_pixels<Pixel_rgb565>(&_char_cell_array,
(Pixel_rgb565 *)_fb_addr,
_fb_mode.width(),
_fb_mode.height(),
*_font_family);
int first_dirty_line = 10000,
last_dirty_line = -10000;
for (int line = 0; line < (int)_char_cell_array.num_lines(); line++) {
if (!_char_cell_array.line_dirty(line)) continue;
first_dirty_line = Genode::min(line, first_dirty_line);
last_dirty_line = Genode::max(line, last_dirty_line);
_char_cell_array.mark_line_as_clean(line);
}
int num_dirty_lines = last_dirty_line - first_dirty_line + 1;
if (num_dirty_lines > 0)
_framebuffer->refresh(0, first_dirty_line*_char_height,
_fb_mode.width(),
num_dirty_lines*_char_height);
}
/********************************
** Terminal session interface **
********************************/
Size size() { return Size(_columns, _lines); }
bool avail() { return !_read_buffer->empty(); }
Genode::size_t _read(Genode::size_t dst_len)
{
/* read data, block on first byte if needed */
unsigned num_bytes = 0;
unsigned char *dst = _io_buffer.local_addr<unsigned char>();
Genode::size_t dst_size = Genode::min(_io_buffer.size(), dst_len);
do {
dst[num_bytes++] = _read_buffer->get();;
} while (!_read_buffer->empty() && num_bytes < dst_size);
return num_bytes;
}
void _write(Genode::size_t num_bytes)
{
Genode::Lock::Guard guard(_lock);
unsigned char *src = _io_buffer.local_addr<unsigned char>();
for (unsigned i = 0; i < num_bytes; i++) {
if (verbose)
Genode::printf("%c (%d)\n", src[i], (int)src[i]);
/* submit character to sequence decoder */
_decoder.insert(src[i]);
}
}
Genode::Dataspace_capability _dataspace()
{
return _io_buffer.cap();
}
void connected_sigh(Genode::Signal_context_capability sigh)
{
/*
* Immediately reflect connection-established signal to the
* client because the session is ready to use immediately after
* creation.
*/
Genode::Signal_transmitter(sigh).submit();
}
void read_avail_sigh(Genode::Signal_context_capability cap)
{
_read_buffer->sigh(cap);
}
Genode::size_t read(void *buf, Genode::size_t) { return 0; }
Genode::size_t write(void const *buf, Genode::size_t) { return 0; }
};
class Root_component : public Genode::Root_component<Session_component>
{
private:
Read_buffer *_read_buffer;
Framebuffer::Session *_framebuffer;
Flush_callback_registry &_flush_callback_registry;
Font_family const &_font_family;
protected:
Session_component *_create_session(const char *args)
{
Genode::printf("create terminal session\n");
/*
* XXX read I/O buffer size from args
*/
Genode::size_t io_buffer_size = 4096;
Session_component *session =
new (md_alloc()) Session_component(_read_buffer,
_framebuffer,
io_buffer_size,
_flush_callback_registry,
_font_family);
return session;
}
public:
/**
* Constructor
*/
Root_component(Genode::Rpc_entrypoint *ep,
Genode::Allocator *md_alloc,
Read_buffer *read_buffer,
Framebuffer::Session *framebuffer,
Flush_callback_registry &flush_callback_registry,
Font_family const &font_family)
:
Genode::Root_component<Session_component>(ep, md_alloc),
_read_buffer(read_buffer), _framebuffer(framebuffer),
_flush_callback_registry(flush_callback_registry),
_font_family(font_family)
{ }
};
}
int main(int, char **)
{
using namespace Genode;
PDBG("--- terminal service started ---");
static Framebuffer::Connection framebuffer;
static Input::Connection input;
static Timer::Connection timer;
static Cap_connection cap;
Dataspace_capability ev_ds_cap = input.dataspace();
Input::Event *ev_buf = static_cast<Input::Event *>
(env()->rm_session()->attach(ev_ds_cap));
/* initialize entry point that serves the root interface */
enum { STACK_SIZE = sizeof(addr_t)*1024 };
static Rpc_entrypoint ep(&cap, STACK_SIZE, "terminal_ep");
static Sliced_heap sliced_heap(env()->ram_session(), env()->rm_session());
/* input read buffer */
static Terminal::Read_buffer read_buffer;
/* initialize color palette */
color_palette[0] = Color( 0, 0, 0); /* black */
color_palette[1] = Color(255, 128, 128); /* red */
color_palette[2] = Color(128, 255, 128); /* green */
color_palette[3] = Color(255, 255, 0); /* yellow */
color_palette[4] = Color(128, 128, 255); /* blue */
color_palette[5] = Color(255, 0, 255); /* magenta */
color_palette[6] = Color( 0, 255, 255); /* cyan */
color_palette[7] = Color(255, 255, 255); /* white */
/* the upper portion of the palette contains highlight colors */
for (int i = 0; i < 8; i++) {
Color col = color_palette[i];
col = Color((col.r*2)/3, (col.g*2)/3, (col.b*2)/3);
color_palette[i + 8] = col;
}
/* built-in fonts */
extern char _binary_notix_8_tff_start;
extern char _binary_terminus_12_tff_start;
extern char _binary_terminus_16_tff_start;
/* pick font according to config file */
char const *font_data = &_binary_terminus_16_tff_start;
try {
size_t font_size = 16;
config()->xml_node().sub_node("font")
.attribute("size").value(&font_size);
switch (font_size) {
case 8: font_data = &_binary_notix_8_tff_start; break;
case 12: font_data = &_binary_terminus_12_tff_start; break;
case 16: font_data = &_binary_terminus_16_tff_start; break;
default: break;
}
} catch (...) { }
static Font font(font_data);
static Font_family font_family(font);
printf("cell size is %dx%d\n", (int)font_family.cell_width(),
(int)font_family.cell_height());
static Terminal::Flush_callback_registry flush_callback_registry;
/* create root interface for service */
static Terminal::Root_component root(&ep, &sliced_heap,
&read_buffer, &framebuffer,
flush_callback_registry,
font_family);
/* announce service at our parent */
env()->parent()->announce(ep.manage(&root));
/* state needed for key-repeat handling */
static int const repeat_delay = 170;
static int const repeat_rate = 25;
static int repeat_cnt = 0;
unsigned char *keymap = Terminal::usenglish_keymap;
unsigned char *shift = Terminal::usenglish_shift;
unsigned char *altgr = 0;
/*
* Read keyboard layout from config file
*/
try {
if (config()->xml_node().sub_node("keyboard")
.attribute("layout").has_value("de")) {
keymap = Terminal::german_keymap;
shift = Terminal::german_shift;
altgr = Terminal::german_altgr;
}
} catch (...) { }
static Terminal::Scancode_tracker
scancode_tracker(keymap, shift, altgr, Terminal::control);
while (1) {
flush_callback_registry.flush();
while (!input.is_pending()) {
enum { PASSED_MSECS = 10 };
timer.msleep(PASSED_MSECS);
flush_callback_registry.flush();
if (scancode_tracker.valid()) {
repeat_cnt -= PASSED_MSECS;
if (repeat_cnt < 0) {
/* repeat current character or sequence */
scancode_tracker.emit_current_character(read_buffer);
/* reset repeat counter according to repeat rate */
repeat_cnt = repeat_rate;
}
}
}
unsigned num_events = input.flush();
for (Input::Event *event = ev_buf; num_events--; event++) {
bool press = (event->type() == Input::Event::PRESS ? true : false);
bool release = (event->type() == Input::Event::RELEASE ? true : false);
int keycode = event->code();
if (press || release)
scancode_tracker.submit(keycode, press);
if (press)
scancode_tracker.emit_current_character(read_buffer);
/* setup first key repeat */
repeat_cnt = repeat_delay;
}
}
return 0;
}
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