guacamole-spice-protocol/protocols/ssh/src/display.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 <guacamole/client.h>
#include <guacamole/protocol.h>
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#include "common.h"
#include "types.h"
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#include "display.h"
const guac_terminal_color guac_terminal_palette[16] = {
/* 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 */
/* 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 */
{0xFF, 0xFF, 0xFF}, /* White */
};
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/* Maps any codepoint onto a number between 0 and 511 inclusive */
int __guac_terminal_hash_codepoint(int codepoint) {
/* If within one byte, just return codepoint */
if (codepoint <= 0xFF)
return codepoint;
/* Otherwise, map to next 256 values */
return (codepoint & 0xFF) + 0x100;
}
/**
* 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.
*/
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int __guac_terminal_get_glyph(guac_terminal_display* display, int codepoint) {
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guac_socket* socket = display->client->socket;
int location;
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int bytes;
char utf8[4];
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/* Use foreground color */
const guac_terminal_color* color =
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&guac_terminal_palette[display->glyph_foreground];
/* Use background color */
const guac_terminal_color* background =
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&guac_terminal_palette[display->glyph_background];
cairo_surface_t* surface;
cairo_t* cairo;
PangoLayout* layout;
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/* Get codepoint hash */
int hashcode = __guac_terminal_hash_codepoint(codepoint);
/* If something already stored here, either same codepoint or collision */
if (display->glyphs[hashcode].location) {
location = display->glyphs[hashcode].location - 1;
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/* If match, return match. */
if (display->glyphs[hashcode].codepoint == codepoint)
return location;
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/* Otherwise, reuse location */
}
/* If no collision, allocate new glyph location */
else
location = display->next_glyph++;
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/* Convert to UTF-8 */
bytes = guac_terminal_encode_utf8(codepoint, utf8);
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/* Prepare surface */
surface = cairo_image_surface_create(
CAIRO_FORMAT_ARGB32,
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display->char_width, display->char_height);
cairo = cairo_create(surface);
/* Get layout */
layout = pango_cairo_create_layout(cairo);
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pango_layout_set_font_description(layout, display->font_desc);
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pango_layout_set_text(layout, utf8, bytes);
/* Draw */
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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/* Clear existing glyph (if any) */
guac_protocol_send_rect(socket, display->glyph_stroke,
location * display->char_width, 0,
display->char_width, display->char_height);
guac_protocol_send_cfill(socket, GUAC_COMP_ROUT, display->glyph_stroke,
0x00, 0x00, 0x00, 0xFF);
/* Send glyph */
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guac_protocol_send_png(socket, GUAC_COMP_OVER, display->glyph_stroke, location * display->char_width, 0, surface);
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/* Update filled glyphs */
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guac_protocol_send_rect(socket, display->filled_glyphs,
location * display->char_width, 0,
display->char_width, display->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_OVER, display->filled_glyphs,
background->red,
background->green,
background->blue,
0xFF);
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guac_protocol_send_copy(socket, display->glyph_stroke,
location * display->char_width, 0, display->char_width, display->char_height,
GUAC_COMP_OVER, display->filled_glyphs, location * display->char_width, 0);
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display->glyphs[hashcode].location = location+1;
display->glyphs[hashcode].codepoint = codepoint;
cairo_surface_destroy(surface);
/* Return glyph */
return location;
}
/**
* Sets the attributes of the glyph cache layer such that future copies from
* this layer will display as expected.
*/
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int __guac_terminal_set_colors(guac_terminal_display* display,
guac_terminal_attributes* attributes) {
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guac_socket* socket = display->client->socket;
const guac_terminal_color* background_color;
int background, foreground;
/* Handle reverse video */
if (attributes->reverse != attributes->selected) {
background = attributes->foreground;
foreground = attributes->background;
}
else {
foreground = attributes->foreground;
background = attributes->background;
}
/* Handle bold */
if (attributes->bold && foreground <= 7)
foreground += 8;
/* Get background color */
background_color = &guac_terminal_palette[background];
/* If foreground different from current, colorize */
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if (foreground != display->glyph_foreground) {
/* Get color */
const guac_terminal_color* color =
&guac_terminal_palette[foreground];
/* Colorize letter */
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guac_protocol_send_rect(socket, display->glyph_stroke,
0, 0,
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display->char_width * display->next_glyph, display->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_ATOP, display->glyph_stroke,
color->red,
color->green,
color->blue,
255);
}
/* If any color change at all, update filled */
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if (foreground != display->glyph_foreground
|| background != display->glyph_background) {
/* Set background */
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guac_protocol_send_rect(socket, display->filled_glyphs,
0, 0,
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display->char_width * display->next_glyph, display->char_height);
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guac_protocol_send_cfill(socket, GUAC_COMP_OVER, display->filled_glyphs,
background_color->red,
background_color->green,
background_color->blue,
255);
/* Copy stroke */
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guac_protocol_send_copy(socket, display->glyph_stroke,
0, 0,
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display->char_width * display->next_glyph, display->char_height,
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GUAC_COMP_OVER, display->filled_glyphs,
0, 0);
}
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display->glyph_foreground = foreground;
display->glyph_background = background;
return 0;
}
/**
* Sends the given character to the terminal at the given row and column,
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* rendering the charater immediately. This bypasses the guac_terminal_display
* mechanism and is intended for flushing of updates only.
*/
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int __guac_terminal_set(guac_terminal_display* display, int row, int col, int codepoint) {
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guac_socket* socket = display->client->socket;
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int location = __guac_terminal_get_glyph(display, codepoint);
return guac_protocol_send_copy(socket,
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display->filled_glyphs,
location * display->char_width, 0, display->char_width, display->char_height,
GUAC_COMP_OVER, GUAC_DEFAULT_LAYER,
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display->char_width * col,
display->char_height * row);
}
guac_terminal_display* guac_terminal_display_alloc(guac_client* client, int foreground, int background) {
PangoFontMap* font_map;
PangoFont* font;
PangoFontMetrics* metrics;
PangoContext* context;
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/* Allocate display */
guac_terminal_display* display = malloc(sizeof(guac_terminal_display));
display->client = client;
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memset(display->glyphs, 0, sizeof(display->glyphs));
display->glyph_stroke = guac_client_alloc_buffer(client);
display->filled_glyphs = guac_client_alloc_buffer(client);
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display->select_layer = guac_client_alloc_layer(client);
/* Get font */
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display->font_desc = pango_font_description_new();
pango_font_description_set_family(display->font_desc, "monospace");
pango_font_description_set_weight(display->font_desc, PANGO_WEIGHT_NORMAL);
pango_font_description_set_size(display->font_desc, 12*PANGO_SCALE);
font_map = pango_cairo_font_map_get_default();
context = pango_font_map_create_context(font_map);
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font = pango_font_map_load_font(font_map, context, display->font_desc);
if (font == NULL) {
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guac_client_log_error(display->client, "Unable to get font.");
return NULL;
}
metrics = pango_font_get_metrics(font, NULL);
if (metrics == NULL) {
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guac_client_log_error(display->client, "Unable to get font metrics.");
return NULL;
}
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display->glyph_foreground = foreground;
display->glyph_background = background;
/* Calculate character dimensions */
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display->char_width =
pango_font_metrics_get_approximate_digit_width(metrics) / PANGO_SCALE;
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display->char_height =
(pango_font_metrics_get_descent(metrics)
+ pango_font_metrics_get_ascent(metrics)) / PANGO_SCALE;
/* Initially empty */
display->width = 0;
display->height = 0;
display->operations = NULL;
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return display;
}
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void guac_terminal_display_free(guac_terminal_display* display) {
/* Free operations buffers */
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free(display->operations);
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/* Free display */
free(display);
}
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void guac_terminal_display_copy_columns(guac_terminal_display* display, int row,
int start_column, int end_column, int offset) {
int i;
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guac_terminal_operation* src_current;
guac_terminal_operation* current;
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/* Ignore operations outside display bounds */
if (row < 0 || row >= display->height)
return;
/* Fit range within bounds */
start_column = guac_terminal_fit_to_range(start_column, 0, display->width - 1);
end_column = guac_terminal_fit_to_range(end_column, 0, display->width - 1);
start_column = guac_terminal_fit_to_range(start_column + offset, 0, display->width - 1) - offset;
end_column = guac_terminal_fit_to_range(end_column + offset, 0, display->width - 1) - offset;
src_current = &(display->operations[row * display->width + start_column]);
current = &(display->operations[row * display->width + start_column + offset]);
/* Move data */
memmove(current, src_current,
(end_column - start_column + 1) * sizeof(guac_terminal_operation));
/* Update operations */
for (i=start_column; i<=end_column; i++) {
/* If no operation here, set as copy */
if (current->type == GUAC_CHAR_NOP) {
current->type = GUAC_CHAR_COPY;
current->row = row;
current->column = i;
}
/* Next column */
current++;
}
}
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void guac_terminal_display_copy_rows(guac_terminal_display* display,
int start_row, int end_row, int offset) {
int row, col;
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guac_terminal_operation* src_current_row;
guac_terminal_operation* current_row;
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/* Fit range within bounds */
start_row = guac_terminal_fit_to_range(start_row, 0, display->height - 1);
end_row = guac_terminal_fit_to_range(end_row, 0, display->height - 1);
start_row = guac_terminal_fit_to_range(start_row + offset, 0, display->height - 1) - offset;
end_row = guac_terminal_fit_to_range(end_row + offset, 0, display->height - 1) - offset;
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src_current_row = &(display->operations[start_row * display->width]);
current_row = &(display->operations[(start_row + offset) * display->width]);
/* Move data */
memmove(current_row, src_current_row,
(end_row - start_row + 1) * sizeof(guac_terminal_operation) * display->width);
/* Update operations */
for (row=start_row; row<=end_row; row++) {
guac_terminal_operation* current = current_row;
for (col=0; col<display->width; col++) {
/* If no operation here, set as copy */
if (current->type == GUAC_CHAR_NOP) {
current->type = GUAC_CHAR_COPY;
current->row = row;
current->column = col;
}
/* Next column */
current++;
}
/* Next row */
current_row += display->width;
}
}
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void guac_terminal_display_set_columns(guac_terminal_display* display, int row,
int start_column, int end_column, guac_terminal_char* character) {
int i;
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guac_terminal_operation* current;
/* Ignore operations outside display bounds */
if (row < 0 || row >= display->height)
return;
/* Fit range within bounds */
start_column = guac_terminal_fit_to_range(start_column, 0, display->width - 1);
end_column = guac_terminal_fit_to_range(end_column, 0, display->width - 1);
current = &(display->operations[row * display->width + start_column]);
/* For each column in range */
for (i=start_column; i<=end_column; i++) {
/* Set operation */
current->type = GUAC_CHAR_SET;
current->character = *character;
/* Next column */
current++;
}
}
void guac_terminal_display_resize(guac_terminal_display* display, int width, int height) {
guac_terminal_operation* current;
int x, y;
/* Fill with background color (index 0) */
guac_terminal_char fill = {
.value = ' ',
.attributes = {
.foreground = 0,
.background = 0
}
};
/* Free old operations buffer */
if (display->operations != NULL)
free(display->operations);
/* Alloc operations */
display->operations = malloc(width * height *
sizeof(guac_terminal_operation));
/* Init each operation buffer row */
current = display->operations;
for (y=0; y<height; y++) {
/* Init entire row to NOP */
for (x=0; x<width; x++) {
/* If on old part of screen, do not clear */
if (x < display->width && y < display->height)
current->type = GUAC_CHAR_NOP;
/* Otherwise, clear contents first */
else {
current->type = GUAC_CHAR_SET;
current->character = fill;
}
current++;
}
}
/* Set width and height */
display->width = width;
display->height = height;
/* Send initial display size */
guac_protocol_send_size(display->client->socket,
GUAC_DEFAULT_LAYER,
display->char_width * width,
display->char_height * height);
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guac_protocol_send_size(display->client->socket,
display->select_layer,
display->char_width * width,
display->char_height * height);
}
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void __guac_terminal_display_flush_copy(guac_terminal_display* display) {
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guac_terminal_operation* current = display->operations;
int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
/* If operation is a copy operation */
if (current->type == GUAC_CHAR_COPY) {
/* 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;
/* Determine bounds of rectangle */
rect_current_row = current;
expected_row = current->row;
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for (rect_row=row; rect_row<display->height; rect_row++) {
guac_terminal_operation* rect_current = rect_current_row;
expected_col = current->column;
/* Find width */
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for (rect_col=col; rect_col<display->width; rect_col++) {
/* If not identical operation, stop */
if (rect_current->type != GUAC_CHAR_COPY
|| rect_current->row != expected_row
|| rect_current->column != expected_col)
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 */
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rect_current_row += display->width;
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;
for (rect_row=0; rect_row<rect_height; rect_row++) {
guac_terminal_operation* rect_current = rect_current_row;
expected_col = current->column;
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;
/* Next column */
rect_current++;
expected_col++;
}
/* Next row */
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rect_current_row += display->width;
expected_row++;
}
/* Send copy */
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guac_protocol_send_copy(display->client->socket,
GUAC_DEFAULT_LAYER,
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current->column * display->char_width,
current->row * display->char_height,
rect_width * display->char_width,
rect_height * display->char_height,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
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col * display->char_width,
row * display->char_height);
} /* end if copy operation */
/* Next operation */
current++;
}
}
}
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void __guac_terminal_display_flush_clear(guac_terminal_display* display) {
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guac_terminal_operation* current = display->operations;
int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
/* If operation is a cler operation (set to space) */
if (current->type == GUAC_CHAR_SET &&
current->character.value == ' ') {
/* 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 != current->character.attributes.selected)
color = current->character.attributes.foreground;
else
color = current->character.attributes.background;
const guac_terminal_color* guac_color =
&guac_terminal_palette[color];
/* Current row within a subrect */
guac_terminal_operation* rect_current_row;
/* Determine bounds of rectangle */
rect_current_row = current;
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for (rect_row=row; rect_row<display->height; rect_row++) {
guac_terminal_operation* rect_current = rect_current_row;
/* Find width */
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for (rect_col=col; rect_col<display->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;
/* If not identical operation, stop */
if (rect_current->type != GUAC_CHAR_SET
|| rect_current->character.value != ' '
|| joining_color != color)
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 */
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rect_current_row += display->width;
}
/* 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;
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;
/* 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;
/* Next column */
rect_current++;
}
/* Next row */
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rect_current_row += display->width;
}
/* Send rect */
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guac_protocol_send_rect(display->client->socket,
GUAC_DEFAULT_LAYER,
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col * display->char_width,
row * display->char_height,
rect_width * display->char_width,
rect_height * display->char_height);
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guac_protocol_send_cfill(display->client->socket,
GUAC_COMP_OVER,
GUAC_DEFAULT_LAYER,
guac_color->red, guac_color->green, guac_color->blue,
0xFF);
} /* end if clear operation */
/* Next operation */
current++;
}
}
}
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void __guac_terminal_display_flush_set(guac_terminal_display* display) {
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guac_terminal_operation* current = display->operations;
int row, col;
/* For each operation */
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for (row=0; row<display->height; row++) {
for (col=0; col<display->width; col++) {
/* Perform given operation */
if (current->type == GUAC_CHAR_SET) {
/* Set attributes */
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__guac_terminal_set_colors(display,
&(current->character.attributes));
/* Send character */
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__guac_terminal_set(display, row, col,
current->character.value);
/* Mark operation as handled */
current->type = GUAC_CHAR_NOP;
}
/* Next operation */
current++;
}
}
}
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void guac_terminal_display_flush(guac_terminal_display* display) {
/* Flush operations, copies first, then clears, then sets. */
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__guac_terminal_display_flush_copy(display);
__guac_terminal_display_flush_clear(display);
__guac_terminal_display_flush_set(display);
}
void guac_terminal_display_clear_select(guac_terminal_display* display) {
guac_socket* socket = display->client->socket;
guac_layer* select_layer = display->select_layer;
guac_protocol_send_rect(socket, select_layer, 0, 0, 1, 1);
guac_protocol_send_cfill(socket, GUAC_COMP_SRC, select_layer,
0x00, 0x00, 0x00, 0x00);
guac_socket_flush(socket);
}
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void guac_terminal_display_select(guac_terminal_display* display,
int start_row, int start_col, int end_row, int end_col) {
guac_socket* socket = display->client->socket;
guac_layer* select_layer = display->select_layer;
/* If single row, just need one rectangle */
if (start_row == end_row) {
/* Ensure proper ordering of columns */
if (start_col > end_col) {
int temp = start_col;
start_col = end_col;
end_col = temp;
}
/* Select characters between columns */
guac_protocol_send_rect(socket, select_layer,
start_col * display->char_width,
start_row * display->char_height,
(end_col - start_col + 1) * display->char_width,
display->char_height);
}
/* Otherwise, need three */
else {
/* Ensure proper ordering of start and end coords */
if (start_row > end_row) {
int temp;
temp = start_row;
start_row = end_row;
end_row = temp;
temp = start_col;
start_col = end_col;
end_col = temp;
}
/* First row */
guac_protocol_send_rect(socket, select_layer,
start_col * display->char_width,
start_row * display->char_height,
display->width * display->char_width,
display->char_height);
/* Middle */
guac_protocol_send_rect(socket, select_layer,
0,
(start_row + 1) * display->char_height,
display->width * display->char_width,
(end_row - start_row - 1) * display->char_height);
/* Last row */
guac_protocol_send_rect(socket, select_layer,
0,
end_row * display->char_height,
(end_col + 1) * display->char_width,
display->char_height);
}
/* Draw new selection, erasing old */
guac_protocol_send_cfill(socket, GUAC_COMP_SRC, select_layer,
0x00, 0x80, 0xFF, 0x60);
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guac_socket_flush(socket);
}