guacamole-spice-protocol/protocols/ssh/src/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):
* James Muehlner <dagger10k@users.sourceforge.net>
*
* 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 <pthread.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
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#include <guacamole/socket.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include "terminal.h"
#include "terminal_handlers.h"
const guac_terminal_color guac_terminal_palette[16] = {
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/* Normal colors */
{0x00, 0x00, 0x00}, /* Black */
{0x99, 0x3E, 0x3E}, /* Red */
{0x3E, 0x99, 0x3E}, /* Green */
{0x99, 0x99, 0x3E}, /* Brown */
{0x3E, 0x3E, 0x99}, /* Blue */
{0x99, 0x3E, 0x99}, /* Magenta */
{0x3E, 0x99, 0x99}, /* Cyan */
{0x99, 0x99, 0x99}, /* White */
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/* Intense colors */
{0x3E, 0x3E, 0x3E}, /* Black */
{0xFF, 0x67, 0x67}, /* Red */
{0x67, 0xFF, 0x67}, /* Green */
{0xFF, 0xFF, 0x67}, /* Brown */
{0x67, 0x67, 0xFF}, /* Blue */
{0xFF, 0x67, 0xFF}, /* Magenta */
{0x67, 0xFF, 0xFF}, /* Cyan */
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{0xFF, 0xFF, 0xFF}, /* White */
};
guac_terminal* guac_terminal_create(guac_client* client,
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int width, int height) {
guac_terminal_attributes default_attributes = {
.foreground = 7,
.background = 0,
.bold = false,
.reverse = false,
.underscore = false
};
PangoFontMap* font_map;
PangoFont* font;
PangoFontMetrics* metrics;
PangoContext* context;
guac_terminal* term = malloc(sizeof(guac_terminal));
term->client = client;
term->current_attributes =
term->default_attributes = default_attributes;
term->glyph_foreground = default_attributes.foreground;
term->glyph_background = default_attributes.background;
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memset(term->glyphs, 0, sizeof(term->glyphs));
term->glyph_stroke = guac_client_alloc_buffer(client);
term->filled_glyphs = guac_client_alloc_buffer(client);
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/* 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);
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pango_font_description_set_size(term->font_desc, 12*PANGO_SCALE);
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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_client_log_error(term->client, "Unable to get font.");
return NULL;
}
metrics = pango_font_get_metrics(font, NULL);
if (metrics == NULL) {
guac_client_log_error(term->client, "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;
term->cursor_row = 0;
term->cursor_col = 0;
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term->term_width = width / term->char_width;
term->term_height = height / term->char_height;
term->char_handler = guac_terminal_echo;
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term->scroll_start = 0;
term->scroll_end = term->term_height - 1;
/* Init scrollback buffer */
term->scrollback = guac_terminal_scrollback_buffer_alloc(1000);
term->scroll_offset = 0;
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/* Init delta */
term->delta = guac_terminal_delta_alloc(term->term_width,
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term->term_height);
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/* Init buffer */
term->buffer = guac_terminal_buffer_alloc(term->term_width,
term->term_height);
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/* Clear with background color */
guac_terminal_clear(term,
0, 0, term->term_height, term->term_width);
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/* Init terminal lock */
pthread_mutex_init(&(term->lock), NULL);
return term;
}
void guac_terminal_free(guac_terminal* term) {
/* Free scrollback buffer */
guac_terminal_scrollback_buffer_free(term->scrollback);
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/* Free delta */
guac_terminal_delta_free(term->delta);
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/* Free buffer */
guac_terminal_buffer_free(term->buffer);
}
/**
* Returns the location of the given character in the glyph cache layer,
* sending it first if necessary. The location returned is in characters,
* and thus must be multiplied by the glyph width to obtain the actual
* location within the glyph cache layer.
*/
int __guac_terminal_get_glyph(guac_terminal* term, char c) {
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guac_socket* socket = term->client->socket;
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int location;
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/* Use foreground color */
const guac_terminal_color* color =
&guac_terminal_palette[term->glyph_foreground];
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/* Use background color */
const guac_terminal_color* background =
&guac_terminal_palette[term->glyph_background];
cairo_surface_t* surface;
cairo_t* cairo;
PangoLayout* layout;
/* Return glyph if exists */
if (term->glyphs[(int) c])
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return term->glyphs[(int) c] - 1;
location = term->next_glyph++;
/* 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 */
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cairo_set_source_rgba(cairo,
color->red / 255.0,
color->green / 255.0,
color->blue / 255.0,
1.0 /* alpha */ );
cairo_move_to(cairo, 0.0, 0.0);
pango_cairo_show_layout(cairo, layout);
/* Free all */
g_object_unref(layout);
cairo_destroy(cairo);
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/* Send glyph and update filled flyphs */
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guac_protocol_send_png(socket, GUAC_COMP_OVER, term->glyph_stroke, location * term->char_width, 0, surface);
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guac_protocol_send_rect(socket, term->filled_glyphs,
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location * term->char_width, 0,
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term->char_width, term->char_height);
guac_protocol_send_cfill(socket, GUAC_COMP_OVER, term->filled_glyphs,
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background->red,
background->green,
background->blue,
0xFF);
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guac_protocol_send_copy(socket, term->glyph_stroke,
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location * term->char_width, 0, term->char_width, term->char_height,
GUAC_COMP_OVER, term->filled_glyphs, location * term->char_width, 0);
term->glyphs[(int) c] = location+1;
cairo_surface_destroy(surface);
/* Return glyph */
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return location;
}
/**
* Sets the attributes of the glyph cache layer such that future copies from
* this layer will display as expected.
*/
int __guac_terminal_set_colors(guac_terminal* term,
guac_terminal_attributes* attributes) {
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guac_socket* socket = term->client->socket;
const guac_terminal_color* background_color;
int background, foreground;
/* Handle reverse video */
if (attributes->reverse) {
background = attributes->foreground;
foreground = attributes->background;
}
else {
foreground = attributes->foreground;
background = attributes->background;
}
/* Handle bold */
if (attributes->bold && foreground <= 7)
foreground += 8;
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/* Get background color */
background_color = &guac_terminal_palette[background];
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/* If foreground different from current, colorize */
if (foreground != term->glyph_foreground) {
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/* Get color */
const guac_terminal_color* color =
&guac_terminal_palette[foreground];
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/* Colorize letter */
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guac_protocol_send_rect(socket, term->glyph_stroke,
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0, 0,
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term->char_width * term->next_glyph, term->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_ATOP, term->glyph_stroke,
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color->red,
color->green,
color->blue,
255);
}
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/* If any color change at all, update filled */
if (foreground != term->glyph_foreground
|| background != term->glyph_background) {
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/* Set background */
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guac_protocol_send_rect(socket, term->filled_glyphs,
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0, 0,
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term->char_width * term->next_glyph, term->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_OVER, term->filled_glyphs,
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background_color->red,
background_color->green,
background_color->blue,
255);
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/* Copy stroke */
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guac_protocol_send_copy(socket, term->glyph_stroke,
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0, 0,
term->char_width * term->next_glyph, term->char_height,
GUAC_COMP_OVER, term->filled_glyphs,
0, 0);
}
term->glyph_foreground = foreground;
term->glyph_background = background;
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return 0;
}
/**
* Sends the given character to the terminal at the given row and column,
* rendering the charater immediately. This bypasses the guac_terminal_delta
* mechanism and is intended for flushing of updates only.
*/
int __guac_terminal_set(guac_terminal* term, int row, int col, char c) {
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guac_socket* socket = term->client->socket;
int location = __guac_terminal_get_glyph(term, c);
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return guac_protocol_send_copy(socket,
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term->filled_glyphs,
location * term->char_width, 0, term->char_width, term->char_height,
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GUAC_COMP_OVER, GUAC_DEFAULT_LAYER,
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term->char_width * col,
term->char_height * row);
}
int guac_terminal_set(guac_terminal* term, int row, int col, char c) {
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int scrolled_row = row + term->scroll_offset;
/* Build character with current attributes */
guac_terminal_char guac_char;
guac_char.value = c;
guac_char.attributes = term->current_attributes;
/* Set delta */
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if (scrolled_row < term->delta->height)
guac_terminal_delta_set(term->delta, scrolled_row, col, &guac_char);
/* Set buffer */
guac_terminal_buffer_set(term->buffer, row, col, &guac_char);
return 0;
}
int guac_terminal_toggle_reverse(guac_terminal* term, int row, int col) {
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int scrolled_row = row + term->scroll_offset;
/* Get character from buffer */
guac_terminal_char* guac_char =
&(term->buffer->characters[row*term->buffer->width + col]);
/* Toggle reverse */
guac_char->attributes.reverse = !(guac_char->attributes.reverse);
/* Set delta */
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if (scrolled_row < term->delta->height)
guac_terminal_delta_set(term->delta, scrolled_row, col, guac_char);
return 0;
}
int guac_terminal_write(guac_terminal* term, const char* c, int size) {
while (size > 0) {
term->char_handler(term, *(c++));
size--;
}
return 0;
}
int guac_terminal_copy(guac_terminal* term,
int src_row, int src_col, int rows, int cols,
int dst_row, int dst_col) {
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int scrolled_src_row = src_row + term->scroll_offset;
int scrolled_dst_row = dst_row + term->scroll_offset;
int scrolled_rows = rows;
/* FIXME: If source (but not dest) is partially scrolled out of view, then
* the delta will not be updated properly. We need to pull the data
* from the buffer in such a case.
*/
if (scrolled_src_row < term->delta->height &&
scrolled_dst_row < term->delta->height) {
/* Adjust delta rect height if scrolled out of view */
if (scrolled_src_row + scrolled_rows > term->delta->height)
scrolled_rows = term->delta->height - scrolled_src_row;
if (scrolled_dst_row + scrolled_rows > term->delta->height)
scrolled_rows = term->delta->height - scrolled_dst_row;
/* Update delta */
guac_terminal_delta_copy(term->delta,
scrolled_dst_row, dst_col,
scrolled_src_row, src_col,
cols, rows);
}
/* Update buffer */
guac_terminal_buffer_copy(term->buffer,
dst_row, dst_col,
src_row, src_col,
cols, rows);
return 0;
}
int guac_terminal_clear(guac_terminal* term,
int row, int col, int rows, int cols) {
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int scrolled_row = row + term->scroll_offset;
int scrolled_rows = rows;
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/* Build space */
guac_terminal_char character;
character.value = ' ';
character.attributes = term->current_attributes;
if (scrolled_row < term->delta->height) {
/* Adjust delta rect height if scrolled out of view */
if (scrolled_row + scrolled_rows > term->delta->height)
scrolled_rows = term->delta->height - scrolled_row;
/* Fill with color */
guac_terminal_delta_set_rect(term->delta,
scrolled_row, col, cols, scrolled_rows, &character);
}
guac_terminal_buffer_set_rect(term->buffer,
row, col, cols, rows, &character);
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return 0;
}
int guac_terminal_scroll_up(guac_terminal* term,
int start_row, int end_row, int amount) {
/* Calculate height of scroll region */
int height = end_row - start_row + 1;
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/* If scroll region is entire screen, push rows into scrollback */
if (start_row == 0 && end_row == term->term_height-1)
guac_terminal_scrollback_buffer_append(term->scrollback, term, amount);
return
/* Move rows within scroll region up by the given amount */
guac_terminal_copy(term,
start_row + amount, 0,
height - amount, term->term_width,
start_row, 0)
/* Fill new rows with background */
|| guac_terminal_clear(term,
end_row - amount + 1, 0, amount, term->term_width);
}
int guac_terminal_scroll_down(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 down by the given amount */
guac_terminal_copy(term,
start_row, 0,
height - amount, term->term_width,
start_row + amount, 0)
/* Fill new rows with background */
|| guac_terminal_clear(term,
start_row, 0, amount, term->term_width);
}
int guac_terminal_clear_range(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 (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 (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 (guac_terminal_clear(term,
start_row, 0, end_row - start_row + 1, term->term_width))
return 1;
}
return 0;
}
guac_terminal_delta* guac_terminal_delta_alloc(int width, int height) {
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guac_terminal_operation* current;
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int x, y;
/* Allocate delta */
guac_terminal_delta* delta = malloc(sizeof(guac_terminal_delta));
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/* Set width and height */
delta->width = width;
delta->height = height;
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/* Alloc operations */
delta->operations = malloc(width * height *
sizeof(guac_terminal_operation));
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/* Init each operation buffer row */
current = delta->operations;
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for (y=0; y<height; y++) {
/* Init entire row to NOP */
for (x=0; x<width; x++)
(current++)->type = GUAC_CHAR_NOP;
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}
/* Alloc scratch area */
delta->scratch = malloc(width * height * sizeof(guac_terminal_operation));
return delta;
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}
void guac_terminal_delta_free(guac_terminal_delta* delta) {
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/* Free operations buffers */
free(delta->operations);
free(delta->scratch);
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/* Free delta */
free(delta);
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}
void guac_terminal_delta_resize(guac_terminal_delta* delta,
int width, int height) {
/* STUB */
}
void guac_terminal_delta_set(guac_terminal_delta* delta, int r, int c,
guac_terminal_char* character) {
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/* Get operation at coordinate */
guac_terminal_operation* op = &(delta->operations[r*delta->width + c]);
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/* Store operation */
op->type = GUAC_CHAR_SET;
op->character = *character;
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}
void guac_terminal_delta_copy(guac_terminal_delta* delta,
int dst_row, int dst_column,
int src_row, int src_column,
int w, int h) {
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int row, column;
/* FIXME: Handle intersections between src and dst rects */
memcpy(delta->scratch, delta->operations,
sizeof(guac_terminal_operation) * delta->width * delta->height);
guac_terminal_operation* current_row =
&(delta->operations[dst_row*delta->width + dst_column]);
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guac_terminal_operation* src_current_row =
&(delta->scratch[src_row*delta->width + src_column]);
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/* Set rectangle to copy operations */
for (row=0; row<h; row++) {
guac_terminal_operation* current = current_row;
guac_terminal_operation* src_current = src_current_row;
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for (column=0; column<w; column++) {
/* If copying existing delta operation, just copy that rather
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* than create a new copy op */
if (src_current->type != GUAC_CHAR_NOP)
*current = *src_current;
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/* Store operation */
else {
current->type = GUAC_CHAR_COPY;
current->row = src_row + row;
current->column = src_column + column;
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}
/* Next column */
current++;
src_current++;
}
/* Next row */
current_row += delta->width;
src_current_row += delta->width;
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}
}
void guac_terminal_delta_set_rect(guac_terminal_delta* delta,
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int row, int column, int w, int h,
guac_terminal_char* character) {
guac_terminal_operation* current_row =
&(delta->operations[row*delta->width + column]);
/* Set rectangle contents to given character */
for (row=0; row<h; row++) {
guac_terminal_operation* current = current_row;
for (column=0; column<w; column++) {
/* Store operation */
current->type = GUAC_CHAR_SET;
current->character = *character;
/* Next column */
current++;
}
/* Next row */
current_row += delta->width;
}
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}
void __guac_terminal_delta_flush_copy(guac_terminal_delta* delta,
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guac_terminal* terminal) {
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guac_terminal_operation* current = delta->operations;
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int row, col;
/* For each operation */
for (row=0; row<delta->height; row++) {
for (col=0; col<delta->width; col++) {
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/* If operation is a copy operation */
if (current->type == GUAC_CHAR_COPY) {
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/* The determined bounds of the rectangle of contiguous
* operations */
int detected_right = -1;
int detected_bottom = row;
/* The current row or column within a rectangle */
int rect_row, rect_col;
/* The dimensions of the rectangle as determined */
int rect_width, rect_height;
/* The expected row and column source for the next copy
* operation (if adjacent to current) */
int expected_row, expected_col;
/* Current row within a subrect */
guac_terminal_operation* rect_current_row;
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/* Determine bounds of rectangle */
rect_current_row = current;
expected_row = current->row;
for (rect_row=row; rect_row<delta->height; rect_row++) {
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guac_terminal_operation* rect_current = rect_current_row;
expected_col = current->column;
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/* Find width */
for (rect_col=col; rect_col<delta->width; rect_col++) {
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/* If not identical operation, stop */
if (rect_current->type != GUAC_CHAR_COPY
|| rect_current->row != expected_row
|| rect_current->column != expected_col)
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break;
/* Next column */
rect_current++;
expected_col++;
}
/* If too small, cannot append row */
if (rect_col-1 < detected_right)
break;
/* As row has been accepted, update rect_row of rect */
detected_bottom = rect_row;
/* For now, only set rect_col bound if uninitialized */
if (detected_right == -1)
detected_right = rect_col - 1;
/* Next row */
rect_current_row += delta->width;
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expected_row++;
}
/* Calculate dimensions */
rect_width = detected_right - col + 1;
rect_height = detected_bottom - row + 1;
/* Mark rect as NOP (as it has been handled) */
rect_current_row = current;
expected_row = current->row;
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for (rect_row=0; rect_row<rect_height; rect_row++) {
guac_terminal_operation* rect_current = rect_current_row;
expected_col = current->column;
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for (rect_col=0; rect_col<rect_width; rect_col++) {
/* Mark copy operations as NOP */
if (rect_current->type == GUAC_CHAR_COPY
&& rect_current->row == expected_row
&& rect_current->column == expected_col)
rect_current->type = GUAC_CHAR_NOP;
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/* Next column */
rect_current++;
expected_col++;
}
/* Next row */
rect_current_row += delta->width;
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expected_row++;
}
/* Send copy */
guac_protocol_send_copy(terminal->client->socket,
GUAC_DEFAULT_LAYER,
current->column * terminal->char_width,
current->row * terminal->char_height,
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rect_width * terminal->char_width,
rect_height * terminal->char_height,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
col * terminal->char_width,
row * terminal->char_height);
} /* end if copy operation */
/* Next operation */
current++;
}
}
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}
void __guac_terminal_delta_flush_clear(guac_terminal_delta* delta,
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guac_terminal* terminal) {
guac_terminal_operation* current = delta->operations;
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int row, col;
/* For each operation */
for (row=0; row<delta->height; row++) {
for (col=0; col<delta->width; col++) {
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/* If operation is a cler operation (set to space) */
if (current->type == GUAC_CHAR_SET &&
current->character.value == ' ') {
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/* The determined bounds of the rectangle of contiguous
* operations */
int detected_right = -1;
int detected_bottom = row;
/* The current row or column within a rectangle */
int rect_row, rect_col;
/* The dimensions of the rectangle as determined */
int rect_width, rect_height;
/* Color of the rectangle to draw */
int color;
if (current->character.attributes.reverse)
color = current->character.attributes.foreground;
else
color = current->character.attributes.background;
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const guac_terminal_color* guac_color =
&guac_terminal_palette[color];
/* Current row within a subrect */
guac_terminal_operation* rect_current_row;
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/* Determine bounds of rectangle */
rect_current_row = current;
for (rect_row=row; rect_row<delta->height; rect_row++) {
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guac_terminal_operation* rect_current = rect_current_row;
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/* Find width */
for (rect_col=col; rect_col<delta->width; rect_col++) {
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int joining_color;
if (rect_current->character.attributes.reverse)
joining_color = current->character.attributes.foreground;
else
joining_color = current->character.attributes.background;
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/* If not identical operation, stop */
if (rect_current->type != GUAC_CHAR_SET
|| rect_current->character.value != ' '
|| joining_color != color)
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break;
/* Next column */
rect_current++;
}
/* If too small, cannot append row */
if (rect_col-1 < detected_right)
break;
/* As row has been accepted, update rect_row of rect */
detected_bottom = rect_row;
/* For now, only set rect_col bound if uninitialized */
if (detected_right == -1)
detected_right = rect_col - 1;
/* Next row */
rect_current_row += delta->width;
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}
/* Calculate dimensions */
rect_width = detected_right - col + 1;
rect_height = detected_bottom - row + 1;
/* Mark rect as NOP (as it has been handled) */
rect_current_row = current;
for (rect_row=0; rect_row<rect_height; rect_row++) {
guac_terminal_operation* rect_current = rect_current_row;
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for (rect_col=0; rect_col<rect_width; rect_col++) {
int joining_color;
if (rect_current->character.attributes.reverse)
joining_color = current->character.attributes.foreground;
else
joining_color = current->character.attributes.background;
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/* Mark clear operations as NOP */
if (rect_current->type == GUAC_CHAR_SET
&& rect_current->character.value == ' '
&& joining_color == color)
rect_current->type = GUAC_CHAR_NOP;
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/* Next column */
rect_current++;
}
/* Next row */
rect_current_row += delta->width;
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}
/* Send rect */
guac_protocol_send_rect(terminal->client->socket,
GUAC_DEFAULT_LAYER,
col * terminal->char_width,
row * terminal->char_height,
rect_width * terminal->char_width,
rect_height * terminal->char_height);
guac_protocol_send_cfill(terminal->client->socket,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
guac_color->red, guac_color->green, guac_color->blue,
0xFF);
} /* end if clear operation */
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/* Next operation */
current++;
}
}
}
void __guac_terminal_delta_flush_set(guac_terminal_delta* delta,
guac_terminal* terminal) {
guac_terminal_operation* current = delta->operations;
int row, col;
/* For each operation */
for (row=0; row<delta->height; row++) {
for (col=0; col<delta->width; col++) {
/* Perform given operation */
if (current->type == GUAC_CHAR_SET) {
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/* Set attributes */
__guac_terminal_set_colors(terminal,
&(current->character.attributes));
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/* Send character */
__guac_terminal_set(terminal, row, col,
current->character.value);
/* Mark operation as handled */
current->type = GUAC_CHAR_NOP;
}
/* Next operation */
current++;
}
}
}
void guac_terminal_delta_flush(guac_terminal_delta* delta,
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guac_terminal* terminal) {
/* Flush copy operations first */
__guac_terminal_delta_flush_copy(delta, terminal);
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/* Flush clear operations (as they're just rects) */
__guac_terminal_delta_flush_clear(delta, terminal);
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/* Flush set operations (the only operations remaining) */
__guac_terminal_delta_flush_set(delta, terminal);
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}
guac_terminal_buffer* guac_terminal_buffer_alloc(int width, int height) {
/* Allocate buffer */
guac_terminal_buffer* buffer = malloc(sizeof(guac_terminal_buffer));
/* Set width and height */
buffer->width = width;
buffer->height = height;
/* Alloc characters */
buffer->characters = malloc(width * height *
sizeof(guac_terminal_char));
return buffer;
}
void guac_terminal_buffer_resize(guac_terminal_buffer* buffer,
int width, int height) {
/* STUB */
}
void guac_terminal_buffer_free(guac_terminal_buffer* buffer) {
/* Free characters */
free(buffer->characters);
/* Free buffer*/
free(buffer);
}
void guac_terminal_buffer_set(guac_terminal_buffer* buffer, int r, int c,
guac_terminal_char* character) {
/* Store character */
buffer->characters[r * buffer->width + c] = *character;
}
void guac_terminal_buffer_copy(guac_terminal_buffer* buffer,
int dst_row, int dst_column,
int src_row, int src_column,
int w, int h) {
int row, column;
/* FIXME: Handle intersections between src and dst rects */
guac_terminal_char* current_row =
&(buffer->characters[dst_row*buffer->width + dst_column]);
guac_terminal_char* src_current_row =
&(buffer->characters[src_row*buffer->width + src_column]);
/* Set rectangle to copy operations */
for (row=0; row<h; row++) {
guac_terminal_char* current = current_row;
guac_terminal_char* src_current = src_current_row;
for (column=0; column<w; column++) {
*current = *src_current;
/* Next column */
current++;
src_current++;
}
/* Next row */
current_row += buffer->width;
src_current_row += buffer->width;
}
}
void guac_terminal_buffer_set_rect(guac_terminal_buffer* buffer,
int row, int column, int w, int h,
guac_terminal_char* character) {
guac_terminal_char* current_row =
&(buffer->characters[row*buffer->width + column]);
/* Set rectangle contents to given character */
for (row=0; row<h; row++) {
/* Copy character throughout row */
guac_terminal_char* current = current_row;
for (column=0; column<w; column++)
*(current++) = *character;
/* Next row */
current_row += buffer->width;
}
}
guac_terminal_scrollback_buffer*
guac_terminal_scrollback_buffer_alloc(int rows) {
/* Allocate scrollback */
guac_terminal_scrollback_buffer* buffer =
malloc(sizeof(guac_terminal_scrollback_buffer));
int i;
guac_terminal_scrollback_row* row;
/* Init scrollback data */
buffer->rows = rows;
buffer->top = 0;
buffer->length = 0;
buffer->scrollback = malloc(sizeof(guac_terminal_scrollback_row) *
buffer->rows);
/* Init scrollback rows */
row = buffer->scrollback;
for (i=0; i<rows; i++) {
/* Allocate row */
row->available = 256;
row->length = 0;
row->characters = malloc(sizeof(guac_terminal_char) * row->available);
/* Next row */
row++;
}
return buffer;
}
void guac_terminal_scrollback_buffer_free(
guac_terminal_scrollback_buffer* buffer) {
int i;
guac_terminal_scrollback_row* row = buffer->scrollback;
/* Free all rows */
for (i=0; i<buffer->rows; i++) {
free(row->characters);
row++;
}
/* Free actual buffer */
free(buffer->scrollback);
free(buffer);
}
void guac_terminal_scrollback_buffer_append(
guac_terminal_scrollback_buffer* buffer,
guac_terminal* terminal, int rows) {
int row, column;
/* Copy data into scrollback */
guac_terminal_scrollback_row* scrollback_row =
&(buffer->scrollback[buffer->top]);
guac_terminal_char* current = terminal->buffer->characters;
for (row=0; row<rows; row++) {
/* FIXME: Assumes scrollback row large enough */
/* Copy character data for row */
guac_terminal_char* dest = scrollback_row->characters;
for (column=0; column < terminal->buffer->width; column++)
*(dest++) = *(current++);
scrollback_row->length = terminal->buffer->width;
/* Next scrollback row */
scrollback_row++;
buffer->top++;
/* Wrap around when bottom reached */
if (buffer->top == buffer->rows) {
buffer->top = 0;
scrollback_row = buffer->scrollback;
}
} /* end for each row */
/* Increment row count */
buffer->length += rows;
if (buffer->length > buffer->rows)
buffer->length = buffer->rows;
}
void guac_terminal_scroll_display_down(guac_terminal* terminal,
int scroll_amount) {
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int start_row, end_row;
int dest_row;
int row, column;
/* Limit scroll amount by size of scrollback buffer */
if (scroll_amount > terminal->scroll_offset)
scroll_amount = terminal->scroll_offset;
/* If not scrolling at all, don't bother trying */
if (scroll_amount == 0)
return;
/* Shift screen up */
if (terminal->term_height > scroll_amount)
guac_terminal_delta_copy(terminal->delta,
0, 0, /* Destination row, col */
scroll_amount, 0, /* source row,col */
terminal->term_width, terminal->term_height - scroll_amount);
/* Advance by scroll amount */
terminal->scroll_offset -= scroll_amount;
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/* Get row range */
end_row = terminal->term_height - terminal->scroll_offset - 1;
start_row = end_row - scroll_amount + 1;
dest_row = terminal->term_height - scroll_amount;
/* Draw new rows from scrollback */
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for (row=start_row; row<=end_row; row++) {
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/* If row in past, pull from scrollback */
if (row < 0) {
/* Get row from scrollback */
guac_terminal_scrollback_row* scrollback_row =
guac_terminal_scrollback_buffer_get_row(terminal->scrollback,
row);
/* Draw row */
/* FIXME: Clear row first */
guac_terminal_char* current = scrollback_row->characters;
for (column=0; column<scrollback_row->length; column++)
guac_terminal_delta_set(terminal->delta, dest_row, column,
current++);
}
/* Otherwise, pull from buffer */
else {
guac_terminal_char* current = &(terminal->buffer->characters[
terminal->buffer->width * row]);
for (column=0; column<terminal->buffer->width; column++)
guac_terminal_delta_set(terminal->delta, dest_row, column,
current++);
}
/* Next row */
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dest_row++;
}
/* FIXME: Should flush somewhere more sensible */
guac_terminal_delta_flush(terminal->delta, terminal);
guac_socket_flush(terminal->client->socket);
}
void guac_terminal_scroll_display_up(guac_terminal* terminal,
int scroll_amount) {
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int start_row, end_row;
int dest_row;
int row, column;
/* Limit scroll amount by size of scrollback buffer */
if (terminal->scroll_offset + scroll_amount > terminal->scrollback->length)
scroll_amount = terminal->scrollback->length - terminal->scroll_offset;
/* If not scrolling at all, don't bother trying */
if (scroll_amount == 0)
return;
/* Shift screen down */
if (terminal->term_height > scroll_amount)
guac_terminal_delta_copy(terminal->delta,
scroll_amount, 0, /* Destination row,col */
0, 0, /* Source row, col */
terminal->term_width, terminal->term_height - scroll_amount);
/* Advance by scroll amount */
terminal->scroll_offset += scroll_amount;
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/* Get row range */
start_row = -terminal->scroll_offset;
end_row = start_row + scroll_amount - 1;
dest_row = 0;
/* Draw new rows from scrollback */
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for (row=start_row; row<=end_row; row++) {
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/* Get row from scrollback */
guac_terminal_scrollback_row* scrollback_row =
guac_terminal_scrollback_buffer_get_row(terminal->scrollback, row);
/* Draw row */
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/* FIXME: Clear row first */
guac_terminal_char* current = scrollback_row->characters;
for (column=0; column<scrollback_row->length; column++)
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guac_terminal_delta_set(terminal->delta, dest_row, column,
current++);
/* Next row */
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dest_row++;
}
/* FIXME: Should flush somewhere more sensible */
guac_terminal_delta_flush(terminal->delta, terminal);
guac_socket_flush(terminal->client->socket);
}
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guac_terminal_scrollback_row* guac_terminal_scrollback_buffer_get_row(
guac_terminal_scrollback_buffer* buffer, int row) {
/* Calculate scrollback row index */
int index = buffer->top + row;
if (index < 0) index += buffer->rows;
/* Return found row */
return &(buffer->scrollback[index]);
}