gstreamer/gst/librfb/rfbdecoder.c
2010-03-21 21:39:18 +01:00

894 lines
25 KiB
C

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst/gst.h"
#include <rfb.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#ifndef G_OS_WIN32
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#else
#include <winsock2.h>
#endif
#include <errno.h>
#include "vncauth.h"
#define RFB_GET_UINT32(ptr) GST_READ_UINT32_BE(ptr)
#define RFB_GET_UINT16(ptr) GST_READ_UINT16_BE(ptr)
#define RFB_GET_UINT8(ptr) GST_READ_UINT8(ptr)
#define RFB_SET_UINT32(ptr, val) GST_WRITE_UINT32_BE((ptr),(val))
#define RFB_SET_UINT16(ptr, val) GST_WRITE_UINT16_BE((ptr),(val))
#define RFB_SET_UINT8(ptr, val) GST_WRITE_UINT8((ptr),(val))
GST_DEBUG_CATEGORY_EXTERN (rfbdecoder_debug);
#define GST_CAT_DEFAULT rfbdecoder_debug
#if 0
struct _RfbSocketPrivate
{
gint fd;
sockaddr sa;
}
#endif
static gboolean rfb_decoder_state_wait_for_protocol_version (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_wait_for_security (RfbDecoder * decoder);
static gboolean rfb_decoder_state_send_client_initialisation (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_wait_for_server_initialisation (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_security_result (RfbDecoder * decoder);
static gboolean rfb_decoder_state_normal (RfbDecoder * decoder);
static gboolean rfb_decoder_state_framebuffer_update (RfbDecoder * decoder);
static gboolean rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder *
decoder);
static gboolean rfb_decoder_state_set_colour_map_entries (RfbDecoder * decoder);
static gboolean rfb_decoder_state_server_cut_text (RfbDecoder * decoder);
static void rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static void rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static void rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static void rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
static void rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x,
gint start_y, gint rect_w, gint rect_h);
RfbDecoder *
rfb_decoder_new (void)
{
RfbDecoder *decoder = g_new0 (RfbDecoder, 1);
decoder->fd = -1;
decoder->password = NULL;
decoder->use_copyrect = FALSE;
decoder->offset_x = 0;
decoder->offset_y = 0;
decoder->rect_width = 0;
decoder->rect_height = 0;
decoder->shared_flag = TRUE;
decoder->data = NULL;
decoder->data_len = 0;
return decoder;
}
void
rfb_decoder_free (RfbDecoder * decoder)
{
g_return_if_fail (decoder != NULL);
if (decoder->fd >= 0)
close (decoder->fd);
if (decoder->data)
g_free (decoder->data);
}
gboolean
rfb_decoder_connect_tcp (RfbDecoder * decoder, gchar * addr, guint port)
{
struct sockaddr_in sa;
GST_DEBUG ("connecting to the rfb server");
g_return_val_if_fail (decoder != NULL, FALSE);
g_return_val_if_fail (decoder->fd == -1, FALSE);
g_return_val_if_fail (addr != NULL, FALSE);
decoder->fd = socket (PF_INET, SOCK_STREAM, 0);
if (decoder->fd == -1) {
GST_WARNING ("creating socket failed");
return FALSE;
}
sa.sin_family = AF_INET;
sa.sin_port = htons (port);
#ifndef G_OS_WIN32
inet_pton (AF_INET, addr, &sa.sin_addr);
#else
sa.sin_addr.s_addr = inet_addr (addr);
#endif
if (connect (decoder->fd, (struct sockaddr *) &sa,
sizeof (struct sockaddr)) == -1) {
close (decoder->fd);
decoder->fd = -1;
GST_WARNING ("connection failed");
return FALSE;
}
//rfb_decoder_use_file_descriptor (decoder, fd);
return TRUE;
}
/**
* rfb_decoder_iterate:
* @decoder: The rfb context
*
* Initializes the connection with the rfb server
*
* Returns: TRUE if initialization was succesfull, FALSE on fail.
*/
gboolean
rfb_decoder_iterate (RfbDecoder * decoder)
{
g_return_val_if_fail (decoder != NULL, FALSE);
g_return_val_if_fail (decoder->fd != -1, FALSE);
if (decoder->state == NULL) {
GST_DEBUG ("First iteration: set state to -> wait for protocol version");
decoder->state = rfb_decoder_state_wait_for_protocol_version;
}
GST_DEBUG ("Executing next state in initialization");
return decoder->state (decoder);
}
static guint8 *
rfb_decoder_read (RfbDecoder * decoder, guint32 len)
{
guint32 total = 0;
guint32 now = 0;
g_return_val_if_fail (decoder->fd > 0, NULL);
g_return_val_if_fail (len > 0, NULL);
if (G_UNLIKELY (len > decoder->data_len)) {
if (decoder->data)
g_free (decoder->data);
decoder->data = g_malloc (len);
decoder->data_len = len;
}
while (total < len) {
#ifndef G_OS_WIN32
now = recv (decoder->fd, decoder->data + total, len - total, 0);
#else
now = recv (decoder->fd, (char *) decoder->data + total, len - total, 0);
#endif
if (now <= 0) {
GST_WARNING ("rfb read error on socket");
return NULL;
}
total += now;
}
return decoder->data;
}
static gint
rfb_decoder_send (RfbDecoder * decoder, guint8 * buffer, guint len)
{
g_return_val_if_fail (decoder->fd != 0, FALSE);
g_return_val_if_fail (buffer != NULL, FALSE);
g_return_val_if_fail (len > 0, FALSE);
return write (decoder->fd, buffer, len);
}
void
rfb_decoder_send_update_request (RfbDecoder * decoder,
gboolean incremental, gint x, gint y, gint width, gint height)
{
guint8 data[10];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->fd != -1);
data[0] = 3;
data[1] = incremental;
RFB_SET_UINT16 (data + 2, x);
RFB_SET_UINT16 (data + 4, y);
RFB_SET_UINT16 (data + 6, width);
RFB_SET_UINT16 (data + 8, height);
rfb_decoder_send (decoder, data, 10);
/* create a backup of the prev frame for copyrect encoding */
if (decoder->use_copyrect) {
memcpy (decoder->prev_frame, decoder->frame,
decoder->rect_width * decoder->rect_height * decoder->bpp / 8);
}
decoder->state = rfb_decoder_state_normal;
}
void
rfb_decoder_send_key_event (RfbDecoder * decoder, guint key, gboolean down_flag)
{
guint8 data[8];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->fd != -1);
data[0] = 4;
data[1] = down_flag;
RFB_SET_UINT16 (data + 2, 0);
RFB_SET_UINT32 (data + 4, key);
rfb_decoder_send (decoder, data, 8);
}
void
rfb_decoder_send_pointer_event (RfbDecoder * decoder,
gint button_mask, gint x, gint y)
{
guint8 data[6];
g_return_if_fail (decoder != NULL);
g_return_if_fail (decoder->fd != -1);
data[0] = 5;
data[1] = button_mask;
RFB_SET_UINT16 (data + 2, x);
RFB_SET_UINT16 (data + 4, y);
rfb_decoder_send (decoder, data, 6);
}
/**
* rfb_decoder_state_wait_for_protocol_version:
*
* Negotiate the rfb version used
*
* \TODO Support for versions 3.7 and 3.8
*/
static gboolean
rfb_decoder_state_wait_for_protocol_version (RfbDecoder * decoder)
{
rfb_decoder_read (decoder, 12);
g_return_val_if_fail (memcmp (decoder->data, "RFB 003.00", 10) == 0, FALSE);
g_return_val_if_fail (*(decoder->data + 11) == 0x0a, FALSE);
GST_DEBUG ("\"%.11s\"", decoder->data);
*(decoder->data) = 0x00;
*(decoder->data + 11) = 0x00;
decoder->protocol_major = atoi ((char *) (decoder->data + 4));
decoder->protocol_minor = atoi ((char *) (decoder->data + 8));
GST_DEBUG ("Major version : %d", decoder->protocol_major);
GST_DEBUG ("Minor version : %d", decoder->protocol_minor);
if (decoder->protocol_major != 3) {
GST_INFO
("A major protocol version of %d is not supported, falling back to 3",
decoder->protocol_major);
decoder->protocol_major = 3;
}
switch (decoder->protocol_minor) {
case 3:
break;
default:
GST_INFO ("Minor version %d is not supported, using 3",
decoder->protocol_minor);
decoder->protocol_minor = 3;
}
rfb_decoder_send (decoder, (guint8 *) "RFB 003.003\n", 12);
decoder->state = rfb_decoder_state_wait_for_security;
return TRUE;
}
/*
* a string describing the reason (where a string is specified as a length followed
* by that many ASCII characters)
**/
static gboolean
rfb_decoder_state_reason (RfbDecoder * decoder)
{
gint reason_length;
rfb_decoder_read (decoder, 4);
reason_length = RFB_GET_UINT32 (decoder->data);
rfb_decoder_read (decoder, reason_length);
GST_WARNING ("Reason by server: %s", decoder->data);
return FALSE;
}
static gboolean
rfb_decoder_state_wait_for_security (RfbDecoder * decoder)
{
/*
* Version 3.3 The server decides the security type and sends a single word
*
* The security-type may only take the value 0, 1 or 2. A value of 0 means that the
* connection has failed and is followed by a string giving the reason, as described
* above.
*/
if (IS_VERSION_3_3 (decoder)) {
rfb_decoder_read (decoder, 4);
decoder->security_type = RFB_GET_UINT32 (decoder->data);
GST_DEBUG ("security = %d", decoder->security_type);
g_return_val_if_fail (decoder->security_type < 3, FALSE);
g_return_val_if_fail (decoder->security_type != SECURITY_FAIL,
rfb_decoder_state_reason (decoder));
} else {
/* \TODO Add behavoir for the rfb 3.7 and 3.8 servers */
GST_WARNING ("Other versions are not yet supported");
}
switch (decoder->security_type) {
case SECURITY_NONE:
GST_DEBUG ("Security type is None");
if (IS_VERSION_3_8 (decoder)) {
decoder->state = rfb_decoder_state_security_result;
} else {
decoder->state = rfb_decoder_state_send_client_initialisation;
}
break;
case SECURITY_VNC:
/*
* VNC authentication is to be used and protocol data is to be sent unencrypted. The
* server sends a random 16-byte challenge
*/
GST_DEBUG ("Security type is VNC Authentication");
/* VNC Authentication can't be used if the password is not set */
if (!decoder->password) {
GST_WARNING
("VNC Authentication can't be used if the password is not set");
return FALSE;
}
rfb_decoder_read (decoder, 16);
vncEncryptBytes ((unsigned char *) decoder->data, decoder->password);
rfb_decoder_send (decoder, decoder->data, 16);
GST_DEBUG ("Encrypted challenge send to server");
decoder->state = rfb_decoder_state_security_result;
break;
default:
GST_WARNING ("Security type is not known");
return FALSE;
break;
}
return TRUE;
}
/*
* The server sends a word to inform the client whether the security handshaking was
* successful.
*/
static gboolean
rfb_decoder_state_security_result (RfbDecoder * decoder)
{
rfb_decoder_read (decoder, 4);
if (RFB_GET_UINT32 (decoder->data) != 0) {
GST_WARNING ("Security handshaking failed");
if (IS_VERSION_3_8 (decoder)) {
decoder->state = rfb_decoder_state_reason;
return TRUE;
}
return FALSE;
}
GST_DEBUG ("Security handshaking succesfull");
decoder->state = rfb_decoder_state_send_client_initialisation;
return TRUE;
}
static guint8 *
rfb_decoder_message_set_encodings (GSList * encodings_list)
{
guint8 *message = g_malloc0 (4 + 4 * g_slist_length (encodings_list));
guint32 *encoding_type;
message[0] = 0x02; /* message type */
RFB_SET_UINT16 (message + 2, g_slist_length (encodings_list)); /* number of encodings */
/* write all the encoding types */
encoding_type = (guint32 *) (message + 4);
while (encodings_list) {
RFB_SET_UINT32 (encoding_type, GPOINTER_TO_UINT (encodings_list->data));
encoding_type++;
encodings_list = encodings_list->next;
}
return message;
}
/*
* rfb_decoder_state_set_encodings:
* @decoder: The rfb context
*
* Sends the encoding types that the client can decode to the server
*
* Returns: TRUE if initialization was succesfull, FALSE on fail.
*/
static gboolean
rfb_decoder_state_set_encodings (RfbDecoder * decoder)
{
GSList *encoder_list = NULL;
guint8 *message;
GST_DEBUG ("entered set encodings");
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_HEXTILE));
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_CORRE));
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_RRE));
if (decoder->use_copyrect) {
encoder_list =
g_slist_append (encoder_list,
GUINT_TO_POINTER (ENCODING_TYPE_COPYRECT));
}
encoder_list =
g_slist_append (encoder_list, GUINT_TO_POINTER (ENCODING_TYPE_RAW));
message = rfb_decoder_message_set_encodings (encoder_list);
rfb_decoder_send (decoder, message, 4 + 4 * g_slist_length (encoder_list));
g_free (message);
decoder->state = rfb_decoder_state_normal;
decoder->inited = TRUE;
return TRUE;
}
static gboolean
rfb_decoder_state_send_client_initialisation (RfbDecoder * decoder)
{
guint8 shared_flag;
shared_flag = decoder->shared_flag;
rfb_decoder_send (decoder, &shared_flag, 1);
GST_DEBUG ("shared_flag is %d", shared_flag);
decoder->state = rfb_decoder_state_wait_for_server_initialisation;
return TRUE;
}
static gboolean
rfb_decoder_state_wait_for_server_initialisation (RfbDecoder * decoder)
{
guint32 name_length;
rfb_decoder_read (decoder, 24);
decoder->width = RFB_GET_UINT16 (decoder->data + 0);
decoder->height = RFB_GET_UINT16 (decoder->data + 2);
decoder->bpp = RFB_GET_UINT8 (decoder->data + 4);
decoder->depth = RFB_GET_UINT8 (decoder->data + 5);
decoder->big_endian = RFB_GET_UINT8 (decoder->data + 6);
decoder->true_colour = RFB_GET_UINT8 (decoder->data + 7);
decoder->red_max = RFB_GET_UINT16 (decoder->data + 8);
decoder->green_max = RFB_GET_UINT16 (decoder->data + 10);
decoder->blue_max = RFB_GET_UINT16 (decoder->data + 12);
decoder->red_shift = RFB_GET_UINT8 (decoder->data + 14);
decoder->green_shift = RFB_GET_UINT8 (decoder->data + 15);
decoder->blue_shift = RFB_GET_UINT8 (decoder->data + 16);
GST_DEBUG ("Server Initialization");
GST_DEBUG ("width = %d", decoder->width);
GST_DEBUG ("height = %d", decoder->height);
GST_DEBUG ("bpp = %d", decoder->bpp);
GST_DEBUG ("depth = %d", decoder->depth);
GST_DEBUG ("big_endian = %d", decoder->big_endian);
GST_DEBUG ("true_colour= %d", decoder->true_colour);
GST_DEBUG ("red_max = %d", decoder->red_max);
GST_DEBUG ("green_max = %d", decoder->green_max);
GST_DEBUG ("blue_max = %d", decoder->blue_max);
GST_DEBUG ("red_shift = %d", decoder->red_shift);
GST_DEBUG ("green_shift= %d", decoder->green_shift);
GST_DEBUG ("blue_shift = %d", decoder->blue_shift);
name_length = RFB_GET_UINT32 (decoder->data + 20);
rfb_decoder_read (decoder, name_length);
decoder->name = g_strndup ((gchar *) (decoder->data), name_length);
GST_DEBUG ("name = %s", decoder->name);
/* check if we need cropping */
if (decoder->offset_x > 0) {
if (decoder->offset_x > decoder->width) {
GST_WARNING ("Trying to crop more than the width of the server");
} else {
decoder->width -= decoder->offset_x;
}
}
if (decoder->offset_y > 0) {
if (decoder->offset_y > decoder->height) {
GST_WARNING ("Trying to crop more than the height of the server");
} else {
decoder->height -= decoder->offset_y;
}
}
if (decoder->rect_width > 0) {
if (decoder->rect_width > decoder->width) {
GST_WARNING ("Trying to crop more than the width of the server");
} else {
decoder->width = decoder->rect_width;
}
}
if (decoder->rect_height > 0) {
if (decoder->rect_height > decoder->height) {
GST_WARNING ("Trying to crop more than the height of the server");
} else {
decoder->height = decoder->rect_height;
}
}
decoder->state = rfb_decoder_state_set_encodings;
return TRUE;
}
static gboolean
rfb_decoder_state_normal (RfbDecoder * decoder)
{
gint message_type;
GST_DEBUG ("decoder_state_normal");
rfb_decoder_read (decoder, 1);
message_type = RFB_GET_UINT8 (decoder->data);
switch (message_type) {
case MESSAGE_TYPE_FRAMEBUFFER_UPDATE:
GST_DEBUG ("Receiving framebuffer update");
decoder->state = rfb_decoder_state_framebuffer_update;
break;
case 1:
decoder->state = rfb_decoder_state_set_colour_map_entries;
break;
case 2:
/* bell, ignored */
decoder->state = rfb_decoder_state_normal;
break;
case 3:
decoder->state = rfb_decoder_state_server_cut_text;
break;
default:
g_critical ("unknown message type %d", message_type);
}
return TRUE;
}
static gboolean
rfb_decoder_state_framebuffer_update (RfbDecoder * decoder)
{
rfb_decoder_read (decoder, 3);
decoder->n_rects = RFB_GET_UINT16 (decoder->data + 1);
GST_DEBUG ("Number of rectangles : %d", decoder->n_rects);
decoder->state = rfb_decoder_state_framebuffer_update_rectangle;
return TRUE;
}
static gboolean
rfb_decoder_state_framebuffer_update_rectangle (RfbDecoder * decoder)
{
gint x, y, w, h;
gint encoding;
rfb_decoder_read (decoder, 12);
x = RFB_GET_UINT16 (decoder->data + 0) - decoder->offset_x;
y = RFB_GET_UINT16 (decoder->data + 2) - decoder->offset_y;
w = RFB_GET_UINT16 (decoder->data + 4);
h = RFB_GET_UINT16 (decoder->data + 6);
encoding = RFB_GET_UINT32 (decoder->data + 8);
GST_DEBUG ("update recieved");
GST_DEBUG ("x:%d y:%d", x, y);
GST_DEBUG ("w:%d h:%d", w, h);
GST_DEBUG ("encoding: %d", encoding);
switch (encoding) {
case ENCODING_TYPE_RAW:
rfb_decoder_raw_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_COPYRECT:
rfb_decoder_copyrect_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_RRE:
rfb_decoder_rre_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_CORRE:
rfb_decoder_corre_encoding (decoder, x, y, w, h);
break;
case ENCODING_TYPE_HEXTILE:
rfb_decoder_hextile_encoding (decoder, x, y, w, h);
break;
default:
g_critical ("unimplemented encoding\n");
break;
}
decoder->n_rects--;
if (decoder->n_rects == 0) {
decoder->state = NULL;
} else {
decoder->state = rfb_decoder_state_framebuffer_update_rectangle;
}
return TRUE;
}
static void
rfb_decoder_raw_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
gint size;
guint8 *frame, *p;
guint32 raw_line_size;
raw_line_size = rect_w * decoder->bytespp;
size = rect_h * raw_line_size;
GST_DEBUG ("Reading %d bytes (%dx%d)", size, rect_w, rect_h);
rfb_decoder_read (decoder, size);
frame =
decoder->frame + (((start_y * decoder->rect_width) +
start_x) * decoder->bytespp);
p = decoder->data;
while (rect_h--) {
memcpy (frame, p, raw_line_size);
p += raw_line_size;
frame += decoder->line_size;
}
}
static void
rfb_decoder_copyrect_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint16 src_x, src_y;
gint line_width, copyrect_width;
guint8 *src, *dst;
rfb_decoder_read (decoder, 4);
/* don't forget the offset */
src_x = RFB_GET_UINT16 (decoder->data) - decoder->offset_x;
src_y = RFB_GET_UINT16 (decoder->data + 2) - decoder->offset_y;
GST_DEBUG ("Copyrect from %d %d", src_x, src_y);
copyrect_width = rect_w * decoder->bytespp;
line_width = decoder->line_size;
src =
decoder->prev_frame + ((src_y * decoder->rect_width) +
src_x) * decoder->bytespp;
dst =
decoder->frame + ((start_y * decoder->rect_width) +
start_x) * decoder->bytespp;
while (rect_h--) {
memcpy (dst, src, copyrect_width);
src += line_width;
dst += line_width;
}
}
static void
rfb_decoder_fill_rectangle (RfbDecoder * decoder, gint x, gint y, gint w,
gint h, guint32 color)
{
/* fill the whole region with the same color */
guint32 *offset;
gint i, j;
for (i = 0; i < h; i++) {
offset =
(guint32 *) (decoder->frame + ((x + (y +
i) * decoder->rect_width)) * decoder->bytespp);
for (j = 0; j < w; j++) {
*(offset++) = color;
}
}
}
static void
rfb_decoder_rre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint32 number_of_rectangles, color;
guint16 x, y, w, h;
rfb_decoder_read (decoder, 4 + decoder->bytespp);
number_of_rectangles = RFB_GET_UINT32 (decoder->data);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
GST_DEBUG ("number of rectangles :%d", number_of_rectangles);
/* color the background of this rectangle */
rfb_decoder_fill_rectangle (decoder, start_x, start_y, rect_w, rect_h, color);
while (number_of_rectangles--) {
rfb_decoder_read (decoder, decoder->bytespp + 8);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
x = RFB_GET_UINT16 (decoder->data + decoder->bytespp);
y = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 2);
w = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 4);
h = RFB_GET_UINT16 (decoder->data + decoder->bytespp + 6);
/* draw the rectangle in the foreground */
rfb_decoder_fill_rectangle (decoder, start_x + x, start_y + y, w, h, color);
}
}
static void
rfb_decoder_corre_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
guint32 number_of_rectangles, color;
guint8 x, y, w, h;
rfb_decoder_read (decoder, 4 + decoder->bytespp);
number_of_rectangles = RFB_GET_UINT32 (decoder->data);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + 4)));
g_free (decoder->data);
GST_DEBUG ("number of rectangles :%d", number_of_rectangles);
/* color the background of this rectangle */
rfb_decoder_fill_rectangle (decoder, start_x, start_y, rect_w, rect_h, color);
while (number_of_rectangles--) {
rfb_decoder_read (decoder, decoder->bytespp + 4);
color = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
x = RFB_GET_UINT8 (decoder->data + decoder->bytespp);
y = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 1);
w = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 2);
h = RFB_GET_UINT8 (decoder->data + decoder->bytespp + 3);
/* draw the rectangle in the foreground */
rfb_decoder_fill_rectangle (decoder, start_x + x, start_y + y, w, h, color);
g_free (decoder->data);
}
}
static void
rfb_decoder_hextile_encoding (RfbDecoder * decoder, gint start_x, gint start_y,
gint rect_w, gint rect_h)
{
gint32 x, x_count, x_end, x_max, x_max_16;
gint32 y, y_count, y_end, y_max, y_max_16;
guint8 subencoding, nr_subrect, xy, wh;
guint32 background, foreground;
foreground = background = 0;
x_end = rect_w % 16;
x_count = rect_w / 16 + (x_end > 0 ? 1 : 0);
y_end = rect_h % 16;
y_count = rect_h / 16 + (y_end > 0 ? 1 : 0);
x_max = start_x + rect_w;
y_max = start_y + rect_h;
x_max_16 = x_max - 16;
y_max_16 = y_max - 16;
for (y = start_y; y < y_max; y += 16) {
for (x = start_x; x < x_max; x += 16) {
rfb_decoder_read (decoder, 1);
subencoding = RFB_GET_UINT8 (decoder->data);
if (subencoding & SUBENCODING_RAW) {
rfb_decoder_raw_encoding (decoder, x, y,
(x <= x_max_16 ? 16 : x_end), (y <= y_max_16 ? 16 : y_end));
continue;
}
if (subencoding & SUBENCODING_BACKGROUND) {
rfb_decoder_read (decoder, decoder->bytespp);
background = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
}
rfb_decoder_fill_rectangle (decoder, x, y,
(x <= x_max_16 ? 16 : x_end), (y <= y_max_16 ? 16 : y_end),
background);
if (subencoding & SUBENCODING_FOREGROUND) {
rfb_decoder_read (decoder, decoder->bytespp);
foreground = GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data)));
}
if (subencoding & SUBENCODING_ANYSUBRECTS) {
rfb_decoder_read (decoder, 1);
nr_subrect = RFB_GET_UINT8 (decoder->data);
} else {
continue;
}
if (subencoding & SUBENCODING_SUBRECTSCOLORED) {
guint offset = 0;
rfb_decoder_read (decoder, nr_subrect * (2 + decoder->bytespp));
while (nr_subrect--) {
foreground =
GUINT32_SWAP_LE_BE ((RFB_GET_UINT32 (decoder->data + offset)));
offset += decoder->bytespp;
xy = RFB_GET_UINT8 (decoder->data + offset++);
wh = RFB_GET_UINT8 (decoder->data + offset++);
rfb_decoder_fill_rectangle (decoder, x + (xy >> 4), y + (xy & 0xF),
1 + (wh >> 4), 1 + (wh & 0xF), foreground);
}
} else {
guint offset = 0;
rfb_decoder_read (decoder, 2 * nr_subrect);
while (nr_subrect--) {
xy = RFB_GET_UINT8 (decoder->data + offset++);
wh = RFB_GET_UINT8 (decoder->data + offset++);
rfb_decoder_fill_rectangle (decoder, x + (xy >> 4), y + (xy & 0xF),
1 + (wh >> 4), 1 + (wh & 0xF), foreground);
}
}
}
}
}
static gboolean
rfb_decoder_state_set_colour_map_entries (RfbDecoder * decoder)
{
g_critical ("not implemented");
return FALSE;
}
static gboolean
rfb_decoder_state_server_cut_text (RfbDecoder * decoder)
{
gint cut_text_length;
/* 3 bytes padding, 4 bytes cut_text_length */
rfb_decoder_read (decoder, 7);
cut_text_length = RFB_GET_UINT32 (decoder->data + 3);
rfb_decoder_read (decoder, cut_text_length);
GST_DEBUG ("rfb_decoder_state_server_cut_text: throw away '%s'",
decoder->data);
decoder->state = rfb_decoder_state_normal;
return TRUE;
}