guacamole-spice-protocol/protocols/ssh/src/ssh_terminal.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac-client-ssh.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
#include <guacamole/log.h>
#include <guacamole/guacio.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include "ssh_terminal.h"
#include "ssh_terminal_handlers.h"
ssh_guac_terminal* ssh_guac_terminal_create(guac_client* client) {
PangoFontMap* font_map;
PangoFont* font;
PangoFontMetrics* metrics;
PangoContext* context;
ssh_guac_terminal* term = malloc(sizeof(ssh_guac_terminal));
term->client = client;
term->cursor_row = 0;
term->cursor_col = 0;
term->term_width = 160;
term->term_height = 50;
term->char_handler = ssh_guac_terminal_echo;
/* Get font */
term->font_desc = pango_font_description_new();
pango_font_description_set_family(term->font_desc, "monospace");
pango_font_description_set_weight(term->font_desc, PANGO_WEIGHT_NORMAL);
pango_font_description_set_size(term->font_desc, 8*PANGO_SCALE);
font_map = pango_cairo_font_map_get_default();
context = pango_font_map_create_context(font_map);
font = pango_font_map_load_font(font_map, context, term->font_desc);
if (font == NULL) {
guac_log_error("Unable to get font.");
return NULL;
}
metrics = pango_font_get_metrics(font, NULL);
if (metrics == NULL) {
guac_log_error("Unable to get font metrics.");
return NULL;
}
/* Calculate character dimensions */
term->char_width =
pango_font_metrics_get_approximate_digit_width(metrics) / PANGO_SCALE;
term->char_height =
(pango_font_metrics_get_descent(metrics)
+ pango_font_metrics_get_ascent(metrics)) / PANGO_SCALE;
return term;
}
void ssh_guac_terminal_free(ssh_guac_terminal* term) {
/* STUB */
}
guac_layer* __ssh_guac_terminal_get_glyph(ssh_guac_terminal* term, char c) {
GUACIO* io = term->client->io;
guac_layer* glyph;
cairo_surface_t* surface;
cairo_t* cairo;
PangoLayout* layout;
/* Return glyph if exists */
if (term->glyphs[(int) c])
return term->glyphs[(int) c];
/* Otherwise, draw glyph */
surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
term->char_width, term->char_height);
cairo = cairo_create(surface);
/* Get layout */
layout = pango_cairo_create_layout(cairo);
pango_layout_set_font_description(layout, term->font_desc);
pango_layout_set_text(layout, &c, 1);
/* Draw */
cairo_set_source_rgba(cairo, 1.0, 1.0, 1.0, 1.0);
cairo_move_to(cairo, 0.0, 0.0);
pango_cairo_show_layout(cairo, layout);
/* Free all */
g_object_unref(layout);
cairo_destroy(cairo);
/* Send glyph and save */
glyph = guac_client_alloc_buffer(term->client);
guac_send_png(io, GUAC_COMP_OVER, glyph, 0, 0, surface);
term->glyphs[(int) c] = glyph;
guac_flush(io);
cairo_surface_destroy(surface);
/* Return glyph */
return glyph;
}
int ssh_guac_terminal_send_glyph(ssh_guac_terminal* term, int row, int col, char c) {
GUACIO* io = term->client->io;
guac_layer* glyph = __ssh_guac_terminal_get_glyph(term, c);
return guac_send_copy(io,
glyph, 0, 0, term->char_width, term->char_height,
GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
term->char_width * col,
term->char_height * row);
}
int ssh_guac_terminal_write(ssh_guac_terminal* term, const char* c, int size) {
while (size > 0) {
term->char_handler(term, *(c++));
size--;
}
return 0;
}
int ssh_guac_terminal_copy(ssh_guac_terminal* term,
int src_row, int src_col, int rows, int cols,
int dst_row, int dst_col) {
GUACIO* io = term->client->io;
/* Send copy instruction */
return guac_send_copy(io,
GUAC_DEFAULT_LAYER,
src_col * term->char_width, src_row * term->char_height,
cols * term->char_width, rows * term->char_height,
GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
dst_col * term->char_width, dst_row * term->char_height);
}
int ssh_guac_terminal_clear(ssh_guac_terminal* term,
int row, int col, int rows, int cols) {
GUACIO* io = term->client->io;
/* Fill with background */
return guac_send_rect(io,
GUAC_COMP_SRC, GUAC_DEFAULT_LAYER,
col * term->char_width, row * term->char_height,
cols * term->char_width, rows * term->char_height,
/* Background */
0, 0, 0, 255);
}
int ssh_guac_terminal_scroll_up(ssh_guac_terminal* term,
int start_row, int end_row, int amount) {
/* Calculate height of scroll region */
int height = end_row - start_row + 1;
return
/* Move rows within scroll region up by the given amount */
ssh_guac_terminal_copy(term,
start_row + amount, 0,
height - amount, term->term_width,
start_row, 0)
/* Fill new rows with background */
|| ssh_guac_terminal_clear(term,
end_row - amount + 1, 0, amount, term->term_width);
}
int ssh_guac_terminal_clear_range(ssh_guac_terminal* term,
int start_row, int start_col,
int end_row, int end_col) {
/* If not at far left, must clear sub-region to far right */
if (start_col > 0) {
/* Clear from start_col to far right */
if (ssh_guac_terminal_clear(term,
start_row, start_col, 1, term->term_width - start_col))
return 1;
/* One less row to clear */
start_row++;
}
/* If not at far right, must clear sub-region to far left */
if (end_col < term->term_width - 1) {
/* Clear from far left to end_col */
if (ssh_guac_terminal_clear(term,
end_row, 0, 1, end_col + 1))
return 1;
/* One less row to clear */
end_row--;
}
/* Remaining region now guaranteed rectangular. Clear, if possible */
if (start_row <= end_row) {
if (ssh_guac_terminal_clear(term,
start_row, 0, end_row - start_row + 1, term->term_width))
return 1;
}
return 0;
}