GUAC-1389: Bring common up to date with screen sharing changes.

Makefile.am

@@ -37,6 +37,7 @@ DIST_SUBDIRS =           \
 
 SUBDIRS =       \
     src/libguac \
+    src/common  \
     tests
 
 if ENABLE_COMMON_SSH

src/common/Makefile.am

@@ -27,8 +27,12 @@ noinst_LTLIBRARIES = libguac_common.la
 
 noinst_HEADERS =          \
     guac_io.h             \
+    guac_blank_cursor.h   \
     guac_clipboard.h      \
+    guac_cursor.h         \
+    guac_display.h        \
     guac_dot_cursor.h     \
+    guac_ibar_cursor.h    \
     guac_iconv.h          \
     guac_json.h           \
     guac_list.h           \
@@ -39,8 +43,12 @@ noinst_HEADERS =          \
 
 libguac_common_la_SOURCES = \
     guac_io.c               \
+    guac_blank_cursor.c     \
     guac_clipboard.c        \
+    guac_cursor.c           \
+    guac_display.c          \
     guac_dot_cursor.c       \
+    guac_ibar_cursor.c      \
     guac_iconv.c            \
     guac_json.c             \
     guac_list.c             \

src/common/guac_blank_cursor.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2015 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+#include <guacamole/layer.h>
+#include <guacamole/protocol.h>
+#include <guacamole/socket.h>
+#include <guacamole/user.h>
+
+/* Dimensions */
+const int guac_common_blank_cursor_width  = 1;
+const int guac_common_blank_cursor_height = 1;
+
+/* Format */
+const cairo_format_t guac_common_blank_cursor_format = CAIRO_FORMAT_ARGB32;
+const int guac_common_blank_cursor_stride = 4;
+
+/* Embedded blank cursor graphic */
+unsigned char guac_common_blank_cursor[] = {
+
+    0x00,0x00,0x00,0x00
+
+};
+
+void guac_common_set_blank_cursor(guac_user* user) {
+
+    guac_client* client = user->client;
+    guac_socket* socket = user->socket;
+
+    /* Draw to buffer */
+    guac_layer* cursor = guac_client_alloc_buffer(client);
+
+    cairo_surface_t* graphic = cairo_image_surface_create_for_data(
+            guac_common_blank_cursor,
+            guac_common_blank_cursor_format,
+            guac_common_blank_cursor_width,
+            guac_common_blank_cursor_height,
+            guac_common_blank_cursor_stride);
+
+    guac_user_stream_png(user, socket, GUAC_COMP_SRC, cursor,
+            0, 0, graphic);
+    cairo_surface_destroy(graphic);
+
+    /* Set cursor */
+    guac_protocol_send_cursor(socket, 0, 0, cursor, 0, 0,
+            guac_common_blank_cursor_width,
+            guac_common_blank_cursor_height);
+
+    /* Free buffer */
+    guac_client_free_buffer(client, cursor);
+
+    guac_client_log(client, GUAC_LOG_DEBUG,
+            "Client cursor image set to generic transparent (blank) cursor.");
+
+}
+

src/common/guac_blank_cursor.h

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2015 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef GUAC_COMMON_BLANK_CURSOR_H
+#define GUAC_COMMON_BLANK_CURSOR_H
+
+#include "config.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/user.h>
+
+/**
+ * Width of the embedded transparent (blank) mouse cursor graphic.
+ */
+extern const int guac_common_blank_cursor_width;
+
+/**
+ * Height of the embedded transparent (blank) mouse cursor graphic.
+ */
+extern const int guac_common_blank_cursor_height;
+
+/**
+ * Number of bytes in each row of the embedded transparent (blank) mouse cursor
+ * graphic.
+ */
+extern const int guac_common_blank_cursor_stride;
+
+/**
+ * The Cairo grapic format of the transparent (blank) mouse cursor graphic.
+ */
+extern const cairo_format_t guac_common_blank_cursor_format;
+
+/**
+ * Embedded transparent (blank) mouse cursor graphic.
+ */
+extern unsigned char guac_common_blank_cursor[];
+
+/**
+ * Sets the cursor of the remote display to the embedded transparent (blank)
+ * cursor graphic.
+ *
+ * @param user
+ *     The guac_user to send the cursor to.
+ */
+void guac_common_set_blank_cursor(guac_user* user);
+
+#endif
+

src/common/guac_clipboard.c

@@ -26,6 +26,7 @@
 #include <guacamole/client.h>
 #include <guacamole/protocol.h>
 #include <guacamole/stream.h>
+#include <guacamole/user.h>
 #include <string.h>
 #include <stdlib.h>
 
@@ -48,16 +49,22 @@ void guac_common_clipboard_free(guac_common_clipboard* clipboard) {
     free(clipboard);
 }
 
-void guac_common_clipboard_send(guac_common_clipboard* clipboard, guac_client* client) {
+/**
+ * Callback for guac_client_foreach_user() which sends clipboard data to each
+ * connected client.
+ */
+static void* __send_user_clipboard(guac_user* user, void* data) {
+
+    guac_common_clipboard* clipboard = (guac_common_clipboard*) data;
 
     char* current = clipboard->buffer;
     int remaining = clipboard->length;
 
     /* Begin stream */
-    guac_stream* stream = guac_client_alloc_stream(client);
+    guac_stream* stream = guac_user_alloc_stream(user);
-    guac_protocol_send_clipboard(client->socket, stream, clipboard->mimetype);
+    guac_protocol_send_clipboard(user->socket, stream, clipboard->mimetype);
 
-    guac_client_log(client, GUAC_LOG_DEBUG,
+    guac_user_log(user, GUAC_LOG_DEBUG,
             "Created stream %i for %s clipboard data.",
             stream->index, clipboard->mimetype);
 
@@ -70,8 +77,8 @@ void guac_common_clipboard_send(guac_common_clipboard* clipboard, guac_client* c
             block_size = remaining; 
 
         /* Send block */
-        guac_protocol_send_blob(client->socket, stream, current, block_size);
+        guac_protocol_send_blob(user->socket, stream, current, block_size);
-        guac_client_log(client, GUAC_LOG_DEBUG,
+        guac_user_log(user, GUAC_LOG_DEBUG,
                 "Sent %i bytes of clipboard data on stream %i.",
                 block_size, stream->index);
 
@@ -81,14 +88,22 @@ void guac_common_clipboard_send(guac_common_clipboard* clipboard, guac_client* c
 
     }
 
-    guac_client_log(client, GUAC_LOG_DEBUG,
+    guac_user_log(user, GUAC_LOG_DEBUG,
             "Clipboard stream %i complete.",
             stream->index);
 
     /* End stream */
-    guac_protocol_send_end(client->socket, stream);
+    guac_protocol_send_end(user->socket, stream);
-    guac_client_free_stream(client, stream);
+    guac_user_free_stream(user, stream);
 
+    return NULL;
+
+}
+
+void guac_common_clipboard_send(guac_common_clipboard* clipboard, guac_client* client) {
+    guac_client_log(client, GUAC_LOG_DEBUG, "Broadcasting clipboard to all connected users.");
+    guac_client_foreach_user(client, __send_user_clipboard, clipboard);
+    guac_client_log(client, GUAC_LOG_DEBUG, "Broadcast of clipboard complete.");
 }
 
 void guac_common_clipboard_reset(guac_common_clipboard* clipboard, const char* mimetype) {

src/common/guac_cursor.c

@@ -0,0 +1,289 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "guac_blank_cursor.h"
+#include "guac_dot_cursor.h"
+#include "guac_cursor.h"
+#include "guac_ibar_cursor.h"
+#include "guac_pointer_cursor.h"
+#include "guac_surface.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+#include <guacamole/protocol.h>
+#include <guacamole/socket.h>
+#include <guacamole/user.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+guac_common_cursor* guac_common_cursor_alloc(guac_client* client) {
+
+    guac_common_cursor* cursor = malloc(sizeof(guac_common_cursor));
+    if (cursor == NULL)
+        return NULL;
+
+    /* Associate cursor with client and allocate cursor layer */
+    cursor->client = client;
+    cursor->layer= guac_client_alloc_layer(client);
+
+    /* Allocate initial image buffer */
+    cursor->image_buffer_size = GUAC_COMMON_CURSOR_DEFAULT_SIZE;
+    cursor->image_buffer = malloc(cursor->image_buffer_size);
+
+    /* No cursor image yet */
+    cursor->width = 0;
+    cursor->height = 0;
+    cursor->surface = NULL;
+    cursor->hotspot_x = 0;
+    cursor->hotspot_y = 0;
+
+    /* No user has moved the mouse yet */
+    cursor->user = NULL;
+
+    /* Start cursor in upper-left */
+    cursor->x = 0;
+    cursor->y = 0;
+
+    return cursor;
+
+}
+
+void guac_common_cursor_free(guac_common_cursor* cursor) {
+
+    /* Free image buffer and surface */
+    free(cursor->image_buffer);
+    if (cursor->surface != NULL)
+        cairo_surface_destroy(cursor->surface);
+
+    /* Return layer to pool */
+    guac_client_free_layer(cursor->client, cursor->layer);
+
+    free(cursor);
+
+}
+
+void guac_common_cursor_dup(guac_common_cursor* cursor, guac_user* user,
+        guac_socket* socket) {
+
+    /* Synchronize location */
+    guac_protocol_send_move(socket, cursor->layer, GUAC_DEFAULT_LAYER,
+            cursor->x - cursor->hotspot_x,
+            cursor->y - cursor->hotspot_y,
+            0);
+
+    /* Synchronize cursor image */
+    if (cursor->surface != NULL) {
+        guac_protocol_send_size(socket, cursor->layer,
+                cursor->width, cursor->height);
+
+        guac_user_stream_png(user, socket, GUAC_COMP_SRC,
+                cursor->layer, 0, 0, cursor->surface);
+    }
+
+    guac_socket_flush(socket);
+
+}
+
+void guac_common_cursor_move(guac_common_cursor* cursor, guac_user* user,
+        int x, int y) {
+
+    guac_user* last_user = cursor->user;
+
+    /* Update current user of cursor */
+    if (last_user != user) {
+
+        cursor->user = user;
+
+        /* Make cursor layer visible to previous user */
+        if (last_user != NULL) {
+            guac_protocol_send_shade(last_user->socket, cursor->layer, 255);
+            guac_socket_flush(last_user->socket);
+        }
+
+        /* Show hardware cursor */
+        guac_protocol_send_cursor(user->socket,
+                cursor->hotspot_x, cursor->hotspot_y,
+                cursor->layer, 0, 0, cursor->width, cursor->height);
+
+        /* Hide cursor layer from new user */
+        guac_protocol_send_shade(user->socket, cursor->layer, 0);
+        guac_socket_flush(user->socket);
+
+    }
+
+    /* Update cursor position */
+    cursor->x = x;
+    cursor->y = y;
+
+    guac_protocol_send_move(cursor->client->socket, cursor->layer,
+            GUAC_DEFAULT_LAYER,
+            x - cursor->hotspot_x,
+            y - cursor->hotspot_y,
+            0);
+
+    guac_socket_flush(cursor->client->socket);
+
+}
+
+/**
+ * Ensures the cursor image buffer has enough room to fit an image with the 
+ * given characteristics. Existing image buffer data may be destroyed.
+ */
+static void guac_common_cursor_resize(guac_common_cursor* cursor,
+        int width, int height, int stride) {
+
+    int minimum_size = height * stride;
+
+    /* Grow image buffer if necessary */
+    if (cursor->image_buffer_size < minimum_size) {
+
+        /* Calculate new size */
+        cursor->image_buffer_size = minimum_size*2;
+
+        /* Destructively reallocate image buffer */
+        free(cursor->image_buffer);
+        cursor->image_buffer = malloc(cursor->image_buffer_size);
+
+    }
+
+}
+
+/**
+ * Callback for guac_client_foreach_user() which sends the current cursor image
+ * as PNG data to each connected client.
+ */
+static void* __send_user_cursor_image(guac_user* user, void* data) {
+
+    guac_common_cursor* cursor = (guac_common_cursor*) data;
+
+    guac_user_stream_png(user, user->socket, GUAC_COMP_SRC,
+            cursor->layer, 0, 0, cursor->surface);
+
+    return NULL;
+
+}
+
+void guac_common_cursor_set_argb(guac_common_cursor* cursor, int hx, int hy,
+    unsigned const char* data, int width, int height, int stride) {
+
+    /* Copy image data */
+    guac_common_cursor_resize(cursor, width, height, stride);
+    memcpy(cursor->image_buffer, data, height * stride);
+
+    if (cursor->surface != NULL)
+        cairo_surface_destroy(cursor->surface);
+
+    cursor->surface = cairo_image_surface_create_for_data(cursor->image_buffer,
+            CAIRO_FORMAT_ARGB32, width, height, stride);
+
+    /* Set new cursor parameters */
+    cursor->width = width;
+    cursor->height = height;
+    cursor->hotspot_x = hx;
+    cursor->hotspot_y = hy;
+
+    /* Update location based on new hotspot */
+    guac_protocol_send_move(cursor->client->socket, cursor->layer,
+            GUAC_DEFAULT_LAYER,
+            cursor->x - hx,
+            cursor->y - hy,
+            0);
+
+    /* Broadcast new cursor image to all users */
+    guac_protocol_send_size(cursor->client->socket, cursor->layer,
+            width, height);
+
+    guac_client_foreach_user(cursor->client, __send_user_cursor_image, cursor);
+
+    guac_socket_flush(cursor->client->socket);
+
+    /* Update hardware cursor of current user */
+    if (cursor->user != NULL) {
+        guac_protocol_send_cursor(cursor->user->socket, hx, hy,
+                cursor->layer, 0, 0, width, height);
+
+        guac_socket_flush(cursor->user->socket);
+    }
+
+}
+
+void guac_common_cursor_set_surface(guac_common_cursor* cursor, int hx, int hy,
+    guac_common_surface* surface) {
+
+    /* Set cursor to surface contents */
+    guac_common_cursor_set_argb(cursor, hx, hy, surface->buffer,
+            surface->width, surface->height, surface->stride);
+
+}
+
+void guac_common_cursor_set_pointer(guac_common_cursor* cursor) {
+
+    guac_common_cursor_set_argb(cursor, 0, 0,
+            guac_common_pointer_cursor,
+            guac_common_pointer_cursor_width,
+            guac_common_pointer_cursor_height,
+            guac_common_pointer_cursor_stride);
+
+}
+
+void guac_common_cursor_set_dot(guac_common_cursor* cursor) {
+
+     guac_common_cursor_set_argb(cursor, 2, 2,
+            guac_common_dot_cursor,
+            guac_common_dot_cursor_width,
+            guac_common_dot_cursor_height,
+            guac_common_dot_cursor_stride);
+
+}
+
+void guac_common_cursor_set_ibar(guac_common_cursor* cursor) {
+
+     guac_common_cursor_set_argb(cursor,
+            guac_common_ibar_cursor_width / 2,
+            guac_common_ibar_cursor_height / 2,
+            guac_common_ibar_cursor,
+            guac_common_ibar_cursor_width,
+            guac_common_ibar_cursor_height,
+            guac_common_ibar_cursor_stride);
+
+}
+
+void guac_common_cursor_set_blank(guac_common_cursor* cursor) {
+
+     guac_common_cursor_set_argb(cursor, 0, 0,
+            guac_common_blank_cursor,
+            guac_common_blank_cursor_width,
+            guac_common_blank_cursor_height,
+            guac_common_blank_cursor_stride);
+
+}
+
+void guac_common_cursor_remove_user(guac_common_cursor* cursor,
+        guac_user* user) {
+
+    /* Disassociate from given user */
+    if (cursor->user == user)
+        cursor->user = NULL;
+
+}
+

src/common/guac_cursor.h

@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+
+#ifndef GUAC_COMMON_CURSOR_H
+#define GUAC_COMMON_CURSOR_H
+
+#include "guac_surface.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+#include <guacamole/socket.h>
+#include <guacamole/user.h>
+
+/**
+ * The default size of the cursor image buffer.
+ */
+#define GUAC_COMMON_CURSOR_DEFAULT_SIZE 64*64*4
+
+/**
+ * Cursor object which maintains and synchronizes the current mouse cursor
+ * state across all users of a specific client.
+ */
+typedef struct guac_common_cursor {
+
+    /**
+     * The client to maintain the mouse cursor for.
+     */
+    guac_client* client;
+
+    /**
+     * The cursor layer. This layer will be available to all connected users,
+     * but will be visible only to those users who are not moving the mouse.
+     */
+    guac_layer* layer;
+
+    /**
+     * The width of the cursor image, in pixels.
+     */
+    int width;
+
+    /**
+     * The height of the cursor image, in pixels.
+     */
+    int height;
+
+    /**
+     * Arbitrary image data buffer, backing the Cairo surface used to store
+     * the cursor image.
+     */
+    unsigned char* image_buffer;
+
+    /**
+     * The size of the image data buffer, in bytes.
+     */
+    int image_buffer_size;
+
+    /**
+     * The current cursor image, if any. If the mouse cursor has not yet been
+     * set, this will be NULL.
+     */
+    cairo_surface_t* surface;
+
+    /**
+     * The X coordinate of the hotspot of the mouse cursor.
+     */
+    int hotspot_x;
+
+    /**
+     * The Y coordinate of the hotspot of the mouse cursor.
+     */
+    int hotspot_y;
+
+    /**
+     * The last user to move the mouse, or NULL if no user has moved the
+     * mouse yet.
+     */
+    guac_user* user;
+
+    /**
+     * The X coordinate of the current mouse cursor location.
+     */
+    int x;
+
+    /**
+     * The Y coordinate of the current mouse cursor location.
+     */
+    int y;
+
+} guac_common_cursor;
+
+/**
+ * Allocates a new cursor object which maintains and synchronizes the current
+ * mouse cursor state across all users of the given client.
+ *
+ * @param client The client for which this object shall maintain the mouse
+ *               cursor.
+ */
+guac_common_cursor* guac_common_cursor_alloc(guac_client* client);
+
+/**
+ * Frees the given cursor.
+ *
+ * @param cursor The cursor to free.
+ */
+void guac_common_cursor_free(guac_common_cursor* cursor);
+
+/**
+ * Sends the current state of this cursor across the given socket, including
+ * the current cursor image. The resulting cursor on the remote display will
+ * be visible.
+ *
+ * @param cursor
+ *     The cursor to send.
+ *
+ * @param user
+ *     The user receiving the updated cursor.
+ *
+ * @param socket
+ *     The socket over which the updated cursor should be sent.
+ */
+void guac_common_cursor_dup(guac_common_cursor* cursor, guac_user* user,
+        guac_socket* socket);
+
+/**
+ * Moves the mouse cursor, marking the given user as the most recent user of
+ * the mouse. The remote mouse cursor will be hidden for this user and shown
+ * for all others.
+ *
+ * @param cursor The cursor being moved.
+ * @param user The user that moved the cursor.
+ * @param x The new X coordinate of the cursor.
+ * @param y The new Y coordinate of the cursor.
+ */
+void guac_common_cursor_move(guac_common_cursor* cursor, guac_user* user,
+        int x, int y);
+
+/**
+ * Sets the cursor image to the given raw image data. This raw image data must
+ * be in 32-bit ARGB format, having 8 bits per color component, where the
+ * alpha component is stored in the high-order 8 bits, and blue is stored
+ * in the low-order 8 bits.
+ *
+ * @param cursor The cursor to set the image of.
+ * @param hx The X coordinate of the hotspot of the new cursor image.
+ * @param hy The Y coordinate of the hotspot of the new cursor image.
+ * @param data A pointer to raw 32-bit ARGB image data.
+ * @param width The width of the given image data, in pixels.
+ * @param height The height of the given image data, in pixels.
+ * @param stride The number of bytes in a single row of image data.
+ */
+void guac_common_cursor_set_argb(guac_common_cursor* cursor, int hx, int hy,
+    unsigned const char* data, int width, int height, int stride);
+
+/**
+ * Sets the cursor image to the contents of the given surface. The entire
+ * contents of the surface are used, and the dimensions of the resulting
+ * cursor will be the dimensions of the given surface.
+ *
+ * @param cursor The cursor to set the image of.
+ * @param hx The X coordinate of the hotspot of the new cursor image.
+ * @param hy The Y coordinate of the hotspot of the new cursor image.
+ * @param surface The surface containing the cursor image.
+ */
+void guac_common_cursor_set_surface(guac_common_cursor* cursor, int hx, int hy,
+    guac_common_surface* surface);
+
+/**
+ * Set the cursor of the remote display to the embedded "pointer" graphic. The
+ * pointer graphic is a black arrow with white border.
+ *
+ * @param cursor The cursor to set the image of.
+ */
+void guac_common_cursor_set_pointer(guac_common_cursor* cursor);
+
+/**
+ * Set the cursor of the remote display to the embedded "dot" graphic. The dot
+ * graphic is a small black square with white border.
+ *
+ * @param cursor The cursor to set the image of.
+ */
+void guac_common_cursor_set_dot(guac_common_cursor* cursor);
+
+/**
+ * Sets the cursor of the remote display to the embedded "I-bar" graphic. The
+ * I-bar graphic is a small black "I" shape with white border, used to indicate
+ * the presence of selectable or editable text.
+ *
+ * @param cursor
+ *     The cursor to set the image of.
+ */
+void guac_common_cursor_set_ibar(guac_common_cursor* cursor);
+
+/**
+ * Sets the cursor of the remote display to the embedded transparent (blank)
+ * graphic, effectively hiding the mouse cursor.
+ *
+ * @param cursor
+ *     The cursor to set the image of.
+ */
+void guac_common_cursor_set_blank(guac_common_cursor* cursor);
+
+/**
+ * Removes the given user, such that future synchronization will not occur.
+ * This is necessary when a user leaves the connection. If a user leaves the
+ * connection and this is not called, the corresponding guac_user and socket
+ * may cease to be valid, and future synchronization attempts will segfault.
+ *
+ * @param cursor The cursor to remove the user from.
+ * @param user The user to remove.
+ */
+void guac_common_cursor_remove_user(guac_common_cursor* cursor,
+        guac_user* user);
+
+#endif

src/common/guac_display.c

@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "guac_cursor.h"
+#include "guac_display.h"
+#include "guac_surface.h"
+
+#include <guacamole/client.h>
+#include <guacamole/socket.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * Synchronizes all surfaces within the given linked list to the given socket.
+ * If the provided pointer to the linked list is NULL, this function has no
+ * effect.
+ *
+ * @param layers
+ *     The head element of the linked list of layers to synchronize, which may
+ *     be NULL if the list is currently empty.
+ *
+ * @param user
+ *     The user receiving the layers.
+ *
+ * @param socket
+ *     The socket over which each layer should be sent.
+ */
+static void guac_common_display_dup_layers(guac_common_display_layer* layers,
+        guac_user* user, guac_socket* socket) {
+
+    guac_common_display_layer* current = layers;
+
+    /* Synchronize all surfaces in given list */
+    while (current != NULL) {
+        guac_common_surface_dup(current->surface, user, socket);
+        current = current->next;
+    }
+
+}
+
+/**
+ * Frees all layers and associated surfaces within the given list, as well as
+ * their corresponding list elements. If the provided pointer to the linked
+ * list is NULL, this function has no effect.
+ *
+ * @param layers
+ *     The head element of the linked list of layers to free, which may be NULL
+ *     if the list is currently empty.
+ *
+ * @param client
+ *     The client owning the layers wrapped by each of the layers in the list.
+ */
+static void guac_common_display_free_layers(guac_common_display_layer* layers,
+        guac_client* client) {
+
+    guac_common_display_layer* current = layers;
+
+    /* Free each surface in given list */
+    while (current != NULL) {
+
+        guac_common_display_layer* next = current->next;
+        guac_layer* layer = current->layer;
+
+        /* Free surface */
+        guac_common_surface_free(current->surface);
+
+        /* Free layer or buffer depending on index */
+        if (layer->index < 0)
+            guac_client_free_buffer(client, layer);
+        else if (layer->index > 0)
+            guac_client_free_layer(client, layer);
+
+        /* Free current element and advance to next */
+        free(current);
+        current = next;
+
+    }
+
+}
+
+guac_common_display* guac_common_display_alloc(guac_client* client,
+        int width, int height) {
+
+    /* Allocate display */
+    guac_common_display* display = malloc(sizeof(guac_common_display));
+    if (display == NULL)
+        return NULL;
+
+    /* Associate display with given client */
+    display->client = client;
+
+    /* Allocate shared cursor */
+    display->cursor = guac_common_cursor_alloc(client);
+
+    display->default_surface = guac_common_surface_alloc(client,
+            client->socket, GUAC_DEFAULT_LAYER, width, height);
+
+    /* No initial layers or buffers */
+    display->layers = NULL;
+    display->buffers = NULL;
+
+    return display;
+
+}
+
+void guac_common_display_free(guac_common_display* display) {
+
+    /* Free shared cursor */
+    guac_common_cursor_free(display->cursor);
+
+    /* Free default surface */
+    guac_common_surface_free(display->default_surface);
+
+    /* Free all layers and buffers */
+    guac_common_display_free_layers(display->buffers, display->client);
+    guac_common_display_free_layers(display->layers, display->client);
+
+    free(display);
+
+}
+
+void guac_common_display_dup(guac_common_display* display, guac_user* user,
+        guac_socket* socket) {
+
+    /* Sunchronize shared cursor */
+    guac_common_cursor_dup(display->cursor, user, socket);
+
+    /* Synchronize default surface */
+    guac_common_surface_dup(display->default_surface, user, socket);
+
+    /* Synchronize all layers and buffers */
+    guac_common_display_dup_layers(display->layers, user, socket);
+    guac_common_display_dup_layers(display->buffers, user, socket);
+
+}
+
+void guac_common_display_flush(guac_common_display* display) {
+    guac_common_surface_flush(display->default_surface);
+}
+
+/**
+ * Allocates and inserts a new element into the given linked list of display
+ * layers, associating it with the given layer and surface.
+ *
+ * @param head
+ *     A pointer to the head pointer of the list of layers. The head pointer
+ *     will be updated by this function to point to the newly-allocated
+ *     display layer.
+ *
+ * @param layer
+ *     The Guacamole layer to associated with the new display layer.
+ *
+ * @param surface
+ *     The surface associated with the given Guacamole layer and which should
+ *     be associated with the new display layer.
+ *
+ * @return
+ *     The newly-allocated display layer, which has been associated with the
+ *     provided layer and surface.
+ */
+static guac_common_display_layer* guac_common_display_add_layer(
+        guac_common_display_layer** head, guac_layer* layer,
+        guac_common_surface* surface) {
+
+    guac_common_display_layer* old_head = *head;
+
+    guac_common_display_layer* display_layer =
+        malloc(sizeof(guac_common_display_layer));
+
+    /* Init layer/surface pair */
+    display_layer->layer = layer;
+    display_layer->surface = surface;
+
+    /* Insert list element as the new head */
+    display_layer->prev = NULL;
+    display_layer->next = old_head;
+    *head = display_layer;
+
+    /* Update old head to point to new element, if it existed */
+    if (old_head != NULL)
+        old_head->prev = display_layer;
+
+    return display_layer;
+
+}
+
+/**
+ * Removes the given display layer from the linked list whose head pointer is
+ * provided.
+ *
+ * @param head
+ *     A pointer to the head pointer of the list of layers. The head pointer
+ *     will be updated by this function if necessary, and will be set to NULL
+ *     if the display layer being removed is the only layer in the list.
+ *
+ * @param display_layer
+ *     The display layer to remove from the given list.
+ */
+static void guac_common_display_remove_layer(guac_common_display_layer** head,
+        guac_common_display_layer* display_layer) {
+
+    /* Update previous element, if it exists */
+    if (display_layer->prev != NULL)
+        display_layer->prev->next = display_layer->next;
+
+    /* If there is no previous element, update the list head */
+    else
+        *head = display_layer->next;
+
+    /* Update next element, if it exists */
+    if (display_layer->next != NULL)
+        display_layer->next->prev = display_layer->prev;
+
+}
+
+guac_common_display_layer* guac_common_display_alloc_layer(
+        guac_common_display* display, int width, int height) {
+
+    guac_layer* layer;
+    guac_common_surface* surface;
+
+    /* Allocate Guacamole layer */
+    layer = guac_client_alloc_layer(display->client);
+
+    /* Allocate corresponding surface */
+    surface = guac_common_surface_alloc(display->client,
+            display->client->socket, layer, width, height);
+
+    /* Add layer and surface to list */
+    return guac_common_display_add_layer(&display->layers, layer, surface);
+
+}
+
+guac_common_display_layer* guac_common_display_alloc_buffer(
+        guac_common_display* display, int width, int height) {
+
+    guac_layer* buffer;
+    guac_common_surface* surface;
+
+    /* Allocate Guacamole buffer */
+    buffer = guac_client_alloc_buffer(display->client);
+
+    /* Allocate corresponding surface */
+    surface = guac_common_surface_alloc(display->client,
+            display->client->socket, buffer, width, height);
+
+    /* Add buffer and surface to list */
+    return guac_common_display_add_layer(&display->buffers, buffer, surface);
+
+}
+
+void guac_common_display_free_layer(guac_common_display* display,
+        guac_common_display_layer* display_layer) {
+
+    /* Remove list element from list */
+    guac_common_display_remove_layer(&display->layers, display_layer);
+
+    /* Free associated layer and surface */
+    guac_common_surface_free(display_layer->surface);
+    guac_client_free_layer(display->client, display_layer->layer);
+
+    /* Free list element */
+    free(display_layer);
+
+}
+
+void guac_common_display_free_buffer(guac_common_display* display,
+        guac_common_display_layer* display_buffer) {
+
+    /* Remove list element from list */
+    guac_common_display_remove_layer(&display->buffers, display_buffer);
+
+    /* Free associated layer and surface */
+    guac_common_surface_free(display_buffer->surface);
+    guac_client_free_buffer(display->client, display_buffer->layer);
+
+    /* Free list element */
+    free(display_buffer);
+
+}
+

src/common/guac_display.h

@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef GUAC_COMMON_DISPLAY_H
+#define GUAC_COMMON_DISPLAY_H
+
+#include "guac_cursor.h"
+#include "guac_surface.h"
+
+#include <guacamole/client.h>
+#include <guacamole/socket.h>
+
+/**
+ * A list element representing a pairing of a Guacamole layer with a
+ * corresponding guac_common_surface which wraps that layer. Adjacent layers
+ * within the same list are pointed to with traditional prev/next pointers. The
+ * order of layers in lists need not correspond in any way to the natural
+ * ordering of those layers' indexes nor their stacking order (Z-order) within
+ * the display.
+ */
+typedef struct guac_common_display_layer guac_common_display_layer;
+
+struct guac_common_display_layer {
+
+    /**
+     * A Guacamole layer.
+     */
+    guac_layer* layer;
+
+    /**
+     * The surface which wraps the associated layer.
+     */
+    guac_common_surface* surface;
+
+    /**
+     * The layer immediately prior to this layer within the list containing
+     * this layer, or NULL if this is the first layer/buffer in the list.
+     */
+    guac_common_display_layer* prev;
+
+    /**
+     * The layer immediately following this layer within the list containing
+     * this layer, or NULL if this is the last layer/buffer in the list.
+     */
+    guac_common_display_layer* next;
+
+};
+
+/**
+ * Abstracts a remote Guacamole display, having an associated client,
+ * default surface, mouse cursor, and various allocated buffers and layers.
+ */
+typedef struct guac_common_display {
+
+    /**
+     * The client associate with this display.
+     */
+    guac_client* client;
+
+    /**
+     * The default surface of the client display.
+     */
+    guac_common_surface* default_surface;
+
+    /**
+     * Client-wide cursor, synchronized across all users.
+     */
+    guac_common_cursor* cursor;
+
+    /**
+     * The first element within a linked list of all currently-allocated
+     * layers, or NULL if no layers are currently allocated. The default layer,
+     * layer #0, is stored within default_surface and will not have a
+     * corresponding element within this list.
+     */
+    guac_common_display_layer* layers;
+
+    /**
+     * The first element within a linked list of all currently-allocated
+     * buffers, or NULL if no buffers are currently allocated.
+     */
+    guac_common_display_layer* buffers;
+
+} guac_common_display;
+
+/**
+ * Allocates a new display, abstracting the cursor and buffer/layer allocation
+ * operations of the given guac_client such that client state can be easily
+ * synchronized to joining users.
+ *
+ * @param client The guac_client to associate with this display.
+ * @param width The initial width of the display, in pixels.
+ * @param height The initial height of the display, in pixels.
+ * @return The newly-allocated display.
+ */
+guac_common_display* guac_common_display_alloc(guac_client* client,
+        int width, int height);
+
+/**
+ * Frees the given display, and any associated resources, including any
+ * allocated buffers/layers.
+ *
+ * @param display The display to free.
+ */
+void guac_common_display_free(guac_common_display* display);
+
+/**
+ * Duplicates the state of the given display to the given socket. Any pending
+ * changes to buffers, layers, or the default layer are not flushed.
+ *
+ * @param display
+ *     The display whose state should be sent along the given socket.
+ *
+ * @param user
+ *     The user receiving the display state.
+ *
+ * @param socket
+ *     The socket over which the display state should be sent.
+ */
+void guac_common_display_dup(guac_common_display* display, guac_user* user,
+        guac_socket* socket);
+
+/**
+ * Flushes pending changes to the given display. All pending operations will
+ * become visible to any connected users.
+ *
+ * @param display The display to flush.
+ */
+void guac_common_display_flush(guac_common_display* display);
+
+/**
+ * Allocates a new layer, returning a new wrapped layer and corresponding
+ * surface. The layer may be reused from a previous allocation, if that layer
+ * has since been freed.
+ *
+ * @param display The display to allocate a new layer from.
+ * @param width The width of the layer to allocate, in pixels.
+ * @param height The height of the layer to allocate, in pixels.
+ * @return A newly-allocated layer.
+ */
+guac_common_display_layer* guac_common_display_alloc_layer(
+        guac_common_display* display, int width, int height);
+
+/**
+ * Allocates a new buffer, returning a new wrapped buffer and corresponding
+ * surface. The buffer may be reused from a previous allocation, if that buffer
+ * has since been freed.
+ *
+ * @param display The display to allocate a new buffer from.
+ * @param width The width of the buffer to allocate, in pixels.
+ * @param height The height of the buffer to allocate, in pixels.
+ * @return A newly-allocated buffer.
+ */
+guac_common_display_layer* guac_common_display_alloc_buffer(
+        guac_common_display* display, int width, int height);
+
+/**
+ * Frees the given surface and associated layer, returning the layer to the
+ * given display for future use.
+ *
+ * @param display
+ *     The display originally allocating the layer.
+ *
+ * @param display_layer
+ *     The layer to free.
+ */
+void guac_common_display_free_layer(guac_common_display* display,
+        guac_common_display_layer* display_layer);
+
+/**
+ * Frees the given surface and associated buffer, returning the buffer to the
+ * given display for future use.
+ *
+ * @param display
+ *     The display originally allocating the buffer.
+ *
+ * @param display_buffer
+ *     The buffer to free.
+ */
+void guac_common_display_free_buffer(guac_common_display* display,
+        guac_common_display_layer* display_buffer);
+
+#endif
+

src/common/guac_dot_cursor.c

@@ -27,6 +27,7 @@
 #include <guacamole/layer.h>
 #include <guacamole/protocol.h>
 #include <guacamole/socket.h>
+#include <guacamole/user.h>
 
 /* Macros for prettying up the embedded image. */
 #define X 0x00,0x00,0x00,0xFF
@@ -52,9 +53,10 @@ unsigned char guac_common_dot_cursor[] = {
 
 };
 
-void guac_common_set_dot_cursor(guac_client* client) {
+void guac_common_set_dot_cursor(guac_user* user) {
 
-    guac_socket* socket = client->socket;
+    guac_client* client = user->client;
+    guac_socket* socket = user->socket;
 
     /* Draw to buffer */
     guac_layer* cursor = guac_client_alloc_buffer(client);
@@ -66,7 +68,7 @@ void guac_common_set_dot_cursor(guac_client* client) {
             guac_common_dot_cursor_height,
             guac_common_dot_cursor_stride);
 
-    guac_client_stream_png(client, socket, GUAC_COMP_SRC, cursor,
+    guac_user_stream_png(user, socket, GUAC_COMP_SRC, cursor,
             0, 0, graphic);
     cairo_surface_destroy(graphic);
 

src/common/guac_dot_cursor.h

@@ -27,7 +27,7 @@
 #include "config.h"
 
 #include <cairo/cairo.h>
-#include <guacamole/client.h>
+#include <guacamole/user.h>
 
 /**
  * Width of the embedded mouse cursor graphic.
@@ -57,8 +57,8 @@ extern unsigned char guac_common_dot_cursor[];
 /**
  * Set the cursor of the remote display to the embedded cursor graphic.
  *
- * @param client The guac_client to send the cursor to.
+ * @param user The guac_user to send the cursor to.
  */
-void guac_common_set_dot_cursor(guac_client* client);
+void guac_common_set_dot_cursor(guac_user* user);
 
 #endif

src/common/guac_ibar_cursor.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2015 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/client.h>
+#include <guacamole/layer.h>
+#include <guacamole/protocol.h>
+#include <guacamole/socket.h>
+#include <guacamole/user.h>
+
+/* Macros for prettying up the embedded image. */
+#define X 0x00,0x00,0x00,0xFF
+#define U 0x80,0x80,0x80,0xFF
+#define O 0xFF,0xFF,0xFF,0xFF
+#define _ 0x00,0x00,0x00,0x00
+
+/* Dimensions */
+const int guac_common_ibar_cursor_width  = 7;
+const int guac_common_ibar_cursor_height = 16;
+
+/* Format */
+const cairo_format_t guac_common_ibar_cursor_format = CAIRO_FORMAT_ARGB32;
+const int guac_common_ibar_cursor_stride = 28;
+
+/* Embedded I-bar graphic */
+unsigned char guac_common_ibar_cursor[] = {
+
+        X,X,X,X,X,X,X,
+        X,O,O,U,O,O,X,
+        X,X,X,O,X,X,X,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        _,_,X,O,X,_,_,
+        X,X,X,O,X,X,X,
+        X,O,O,U,O,O,X,
+        X,X,X,X,X,X,X
+
+};
+
+void guac_common_set_ibar_cursor(guac_user* user) {
+
+    guac_client* client = user->client;
+    guac_socket* socket = user->socket;
+
+    /* Draw to buffer */
+    guac_layer* cursor = guac_client_alloc_buffer(client);
+
+    cairo_surface_t* graphic = cairo_image_surface_create_for_data(
+            guac_common_ibar_cursor,
+            guac_common_ibar_cursor_format,
+            guac_common_ibar_cursor_width,
+            guac_common_ibar_cursor_height,
+            guac_common_ibar_cursor_stride);
+
+    guac_user_stream_png(user, socket, GUAC_COMP_SRC, cursor,
+            0, 0, graphic);
+    cairo_surface_destroy(graphic);
+
+    /* Set cursor */
+    guac_protocol_send_cursor(socket, 0, 0, cursor,
+            guac_common_ibar_cursor_width / 2,
+            guac_common_ibar_cursor_height / 2,
+            guac_common_ibar_cursor_width,
+            guac_common_ibar_cursor_height);
+
+    /* Free buffer */
+    guac_client_free_buffer(client, cursor);
+
+    guac_client_log(client, GUAC_LOG_DEBUG,
+            "Client cursor image set to generic built-in I-bar.");
+
+}
+

src/common/guac_ibar_cursor.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2015 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef GUAC_COMMON_IBAR_CURSOR_H
+#define GUAC_COMMON_IBAR_CURSOR_H
+
+#include "config.h"
+
+#include <cairo/cairo.h>
+#include <guacamole/user.h>
+
+/**
+ * Width of the embedded I-bar mouse cursor graphic.
+ */
+extern const int guac_common_ibar_cursor_width;
+
+/**
+ * Height of the embedded I-bar mouse cursor graphic.
+ */
+extern const int guac_common_ibar_cursor_height;
+
+/**
+ * Number of bytes in each row of the embedded I-bar mouse cursor graphic.
+ */
+extern const int guac_common_ibar_cursor_stride;
+
+/**
+ * The Cairo grapic format of the I-bar mouse cursor graphic.
+ */
+extern const cairo_format_t guac_common_ibar_cursor_format;
+
+/**
+ * Embedded I-bar mouse cursor graphic.
+ */
+extern unsigned char guac_common_ibar_cursor[];
+
+/**
+ * Sets the cursor of the remote display to the embedded I-bar cursor graphic.
+ *
+ * @param user
+ *     The guac_user to send the cursor to.
+ */
+void guac_common_set_ibar_cursor(guac_user* user);
+
+#endif
+

src/common/guac_json.c

@@ -28,17 +28,17 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <guacamole/client.h>
 #include <guacamole/protocol.h>
 #include <guacamole/socket.h>
 #include <guacamole/stream.h>
+#include <guacamole/user.h>
 
-void guac_common_json_flush(guac_client* client, guac_stream* stream,
+void guac_common_json_flush(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state) {
 
     /* If JSON buffer is non-empty, write contents to blob and reset */
     if (json_state->size > 0) {
-        guac_protocol_send_blob(client->socket, stream,
+        guac_protocol_send_blob(user->socket, stream,
                 json_state->buffer, json_state->size);
 
         /* Reset JSON buffer size */
@@ -48,7 +48,7 @@ void guac_common_json_flush(guac_client* client, guac_stream* stream,
 
 }
 
-int guac_common_json_write(guac_client* client, guac_stream* stream,
+int guac_common_json_write(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state, const char* buffer, int length) {
 
     int blob_written = 0;
@@ -66,7 +66,7 @@ int guac_common_json_write(guac_client* client, guac_stream* stream,
 
         /* Flush if more room is needed */
         if (json_state->size + blob_length > sizeof(json_state->buffer)) {
-            guac_common_json_flush(client, stream, json_state);
+            guac_common_json_flush(user, stream, json_state);
             blob_written = 1;
         }
 
@@ -86,14 +86,14 @@ int guac_common_json_write(guac_client* client, guac_stream* stream,
 
 }
 
-int guac_common_json_write_string(guac_client* client,
+int guac_common_json_write_string(guac_user* user,
         guac_stream* stream, guac_common_json_state* json_state,
         const char* str) {
 
     int blob_written = 0;
 
     /* Write starting quote */
-    blob_written |= guac_common_json_write(client, stream,
+    blob_written |= guac_common_json_write(user, stream,
             json_state, "\"", 1);
 
     /* Write given string, escaping as necessary */
@@ -105,11 +105,11 @@ int guac_common_json_write_string(guac_client* client,
 
             /* Write any string content up to current character */
             if (current != str)
-                blob_written |= guac_common_json_write(client, stream,
+                blob_written |= guac_common_json_write(user, stream,
                         json_state, str, current - str);
 
             /* Escape the quote that was just read */
-            blob_written |= guac_common_json_write(client, stream,
+            blob_written |= guac_common_json_write(user, stream,
                     json_state, "\\", 1);
 
             /* Reset string */
@@ -121,18 +121,18 @@ int guac_common_json_write_string(guac_client* client,
 
     /* Write any remaining string content */
     if (current != str)
-        blob_written |= guac_common_json_write(client, stream,
+        blob_written |= guac_common_json_write(user, stream,
                 json_state, str, current - str);
 
     /* Write ending quote */
-    blob_written |= guac_common_json_write(client, stream,
+    blob_written |= guac_common_json_write(user, stream,
             json_state, "\"", 1);
 
     return blob_written;
 
 }
 
-int guac_common_json_write_property(guac_client* client, guac_stream* stream,
+int guac_common_json_write_property(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state, const char* name,
         const char* value) {
 
@@ -140,19 +140,19 @@ int guac_common_json_write_property(guac_client* client, guac_stream* stream,
 
     /* Write leading comma if not first property */
     if (json_state->properties_written != 0)
-        blob_written |= guac_common_json_write(client, stream,
+        blob_written |= guac_common_json_write(user, stream,
                 json_state, ",", 1);
 
     /* Write property name */
-    blob_written |= guac_common_json_write_string(client, stream,
+    blob_written |= guac_common_json_write_string(user, stream,
             json_state, name);
 
     /* Separate name from value with colon */
-    blob_written |= guac_common_json_write(client, stream,
+    blob_written |= guac_common_json_write(user, stream,
             json_state, ":", 1);
 
     /* Write property value */
-    blob_written |= guac_common_json_write_string(client, stream,
+    blob_written |= guac_common_json_write_string(user, stream,
             json_state, value);
 
     json_state->properties_written++;
@@ -161,7 +161,7 @@ int guac_common_json_write_property(guac_client* client, guac_stream* stream,
 
 }
 
-void guac_common_json_begin_object(guac_client* client, guac_stream* stream,
+void guac_common_json_begin_object(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state) {
 
     /* Init JSON state */
@@ -169,15 +169,15 @@ void guac_common_json_begin_object(guac_client* client, guac_stream* stream,
     json_state->properties_written = 0;
 
     /* Write leading brace - no blob can possibly be written by this */
-    assert(!guac_common_json_write(client, stream, json_state, "{", 1));
+    assert(!guac_common_json_write(user, stream, json_state, "{", 1));
 
 }
 
-int guac_common_json_end_object(guac_client* client, guac_stream* stream,
+int guac_common_json_end_object(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state) {
 
     /* Write final brace of JSON object */
-    return guac_common_json_write(client, stream, json_state, "}", 1);
+    return guac_common_json_write(user, stream, json_state, "}", 1);
 
 }
 

src/common/guac_json.h

@@ -25,8 +25,8 @@
 
 #include "config.h"
 
-#include <guacamole/client.h>
 #include <guacamole/stream.h>
+#include <guacamole/user.h>
 
 /**
  * The current streaming state of an arbitrary JSON object, consisting of
@@ -55,13 +55,13 @@ typedef struct guac_common_json_state {
 } guac_common_json_state;
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object, flushes the contents of the JSON buffer to a blob
  * instruction. Note that this will flush the JSON buffer only, and will not
- * necessarily flush the underlying guac_socket of the client.
+ * necessarily flush the underlying guac_socket of the user.
  *
- * @param client
+ * @param user
- *     The client to which the data will be flushed.
+ *     The user to which the data will be flushed.
  *
  * @param stream
  *     The stream through which the flushed data should be sent as a blob.
@@ -69,16 +69,16 @@ typedef struct guac_common_json_state {
  * @param json_state
  *     The state object whose buffer should be flushed.
  */
-void guac_common_json_flush(guac_client* client, guac_stream* stream,
+void guac_common_json_flush(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state);
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object, writes the contents of the given buffer to the JSON buffer
  * of the stream state, flushing as necessary.
  *
- * @param client
+ * @param user
- *     The client to which the data will be flushed as necessary.
+ *     The user to which the data will be flushed as necessary.
  *
  * @param stream
  *     The stream through which the flushed data should be sent as a blob, if
@@ -97,17 +97,17 @@ void guac_common_json_flush(guac_client* client, guac_stream* stream,
  * @return
  *     Non-zero if at least one blob was written, zero otherwise.
  */
-int guac_common_json_write(guac_client* client, guac_stream* stream,
+int guac_common_json_write(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state, const char* buffer, int length);
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object state, writes the given string as a proper JSON string,
  * including starting and ending quotes. The contents of the string will be
  * escaped as necessary.
  *
- * @param client
+ * @param user
- *     The client to which the data will be flushed as necessary.
+ *     The user to which the data will be flushed as necessary.
  *
  * @param stream
  *     The stream through which the flushed data should be sent as a blob, if
@@ -123,17 +123,17 @@ int guac_common_json_write(guac_client* client, guac_stream* stream,
  * @return
  *     Non-zero if at least one blob was written, zero otherwise.
  */
-int guac_common_json_write_string(guac_client* client,
+int guac_common_json_write_string(guac_user* user,
         guac_stream* stream, guac_common_json_state* json_state,
         const char* str);
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object, writes the given JSON property name/value pair. The
  * name and value will be written as proper JSON strings separated by a colon.
  *
- * @param client
+ * @param user
- *     The client to which the data will be flushed as necessary.
+ *     The user to which the data will be flushed as necessary.
  *
  * @param stream
  *     The stream through which the flushed data should be sent as a blob, if
@@ -152,18 +152,18 @@ int guac_common_json_write_string(guac_client* client,
  * @return
  *     Non-zero if at least one blob was written, zero otherwise.
  */
-int guac_common_json_write_property(guac_client* client, guac_stream* stream,
+int guac_common_json_write_property(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state, const char* name,
         const char* value);
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object, initializes the state for writing a new JSON object. Note
- * that although the client and stream must be provided, no instruction or
+ * that although the user and stream must be provided, no instruction or
  * blobs will be written due to any call to this function.
  *
- * @param client
+ * @param user
- *     The client associated with the given stream.
+ *     The user associated with the given stream.
  *
  * @param stream
  *     The stream associated with the JSON object being written.
@@ -171,17 +171,17 @@ int guac_common_json_write_property(guac_client* client, guac_stream* stream,
  * @param json_state
  *     The state object to initialize.
  */
-void guac_common_json_begin_object(guac_client* client, guac_stream* stream,
+void guac_common_json_begin_object(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state);
 
 /**
- * Given a stream, the client to which it belongs, and the current stream state
+ * Given a stream, the user to which it belongs, and the current stream state
  * of a JSON object, completes writing that JSON object by writing the final
  * terminating brace. This function must only be called following a
  * corresponding call to guac_common_json_begin_object().
  *
- * @param client
+ * @param user
- *     The client associated with the given stream.
+ *     The user associated with the given stream.
  *
  * @param stream
  *     The stream associated with the JSON object being written.
@@ -192,7 +192,7 @@ void guac_common_json_begin_object(guac_client* client, guac_stream* stream,
  * @return
  *     Non-zero if at least one blob was written, zero otherwise.
  */
-int guac_common_json_end_object(guac_client* client, guac_stream* stream,
+int guac_common_json_end_object(guac_user* user, guac_stream* stream,
         guac_common_json_state* json_state);
 
 #endif

src/common/guac_pointer_cursor.c

@@ -27,6 +27,7 @@
 #include <guacamole/layer.h>
 #include <guacamole/protocol.h>
 #include <guacamole/socket.h>
+#include <guacamole/user.h>
 
 /* Macros for prettying up the embedded image. */
 #define X 0x00,0x00,0x00,0xFF
@@ -63,9 +64,10 @@ unsigned char guac_common_pointer_cursor[] = {
 
 };
 
-void guac_common_set_pointer_cursor(guac_client* client) {
+void guac_common_set_pointer_cursor(guac_user* user) {
 
-    guac_socket* socket = client->socket;
+    guac_client* client = user->client;
+    guac_socket* socket = user->socket;
 
     /* Draw to buffer */
     guac_layer* cursor = guac_client_alloc_buffer(client);
@@ -77,7 +79,7 @@ void guac_common_set_pointer_cursor(guac_client* client) {
             guac_common_pointer_cursor_height,
             guac_common_pointer_cursor_stride);
 
-    guac_client_stream_png(client, socket, GUAC_COMP_SRC, cursor,
+    guac_user_stream_png(user, socket, GUAC_COMP_SRC, cursor,
             0, 0, graphic);
     cairo_surface_destroy(graphic);
 

src/common/guac_pointer_cursor.h

@@ -27,7 +27,7 @@
 #include "config.h"
 
 #include <cairo/cairo.h>
-#include <guacamole/client.h>
+#include <guacamole/user.h>
 
 /**
  * Width of the embedded mouse cursor graphic.
@@ -57,8 +57,8 @@ extern unsigned char guac_common_pointer_cursor[];
 /**
  * Set the cursor of the remote display to the embedded cursor graphic.
  *
- * @param client The guac_client to send the cursor to.
+ * @param user The guac_user to send the cursor to.
  */
-void guac_common_set_pointer_cursor(guac_client* client);
+void guac_common_set_pointer_cursor(guac_user* user);
 
 #endif

src/common/guac_surface.c

@@ -30,6 +30,7 @@
 #include <guacamole/protocol.h>
 #include <guacamole/socket.h>
 #include <guacamole/timestamp.h>
+#include <guacamole/user.h>
 
 #include <stdlib.h>
 #include <stdint.h>
@@ -1303,15 +1304,18 @@ static void __guac_common_surface_flush_to_png(guac_common_surface* surface) {
         const guac_layer* layer = surface->layer;
 
         /* Get Cairo surface for specified rect */
-        unsigned char* buffer = surface->buffer + surface->dirty_rect.y * surface->stride + surface->dirty_rect.x * 4;
+        unsigned char* buffer = surface->buffer
-        cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer, CAIRO_FORMAT_RGB24,
+                              + surface->dirty_rect.y * surface->stride
-                                                                    surface->dirty_rect.width,
+                              + surface->dirty_rect.x * 4;
-                                                                    surface->dirty_rect.height,
+
-                                                                    surface->stride);
+        cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer,
+                CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
+                surface->dirty_rect.height, surface->stride);
 
         /* Send PNG for rect */
         guac_client_stream_png(surface->client, socket, GUAC_COMP_OVER,
                 layer, surface->dirty_rect.x, surface->dirty_rect.y, rect);
+
         cairo_surface_destroy(rect);
         surface->realized = 1;
 
@@ -1347,16 +1351,19 @@ static void __guac_common_surface_flush_to_jpeg(guac_common_surface* surface) {
                                         &surface->dirty_rect, &max);
 
         /* Get Cairo surface for specified rect */
-        unsigned char* buffer = surface->buffer + surface->dirty_rect.y * surface->stride + surface->dirty_rect.x * 4;
+        unsigned char* buffer = surface->buffer
-        cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer, CAIRO_FORMAT_RGB24,
+                              + surface->dirty_rect.y * surface->stride
-                                                                    surface->dirty_rect.width,
+                              + surface->dirty_rect.x * 4;
-                                                                    surface->dirty_rect.height,
+
-                                                                    surface->stride);
+        cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer,
+                CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
+                surface->dirty_rect.height, surface->stride);
 
         /* Send JPEG for rect */
         guac_client_stream_jpeg(surface->client, socket, GUAC_COMP_OVER, layer,
                 surface->dirty_rect.x, surface->dirty_rect.y, rect,
                 GUAC_SURFACE_JPEG_IMAGE_QUALITY);
+
         cairo_surface_destroy(rect);
         surface->realized = 1;
 
@@ -1397,14 +1404,14 @@ static void __guac_common_surface_flush_to_webp(guac_common_surface* surface) {
                               + surface->dirty_rect.x * 4;
 
         cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer,
-                CAIRO_FORMAT_RGB24,
+                CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
-                surface->dirty_rect.width, surface->dirty_rect.height,
+                surface->dirty_rect.height, surface->stride);
-                surface->stride);
 
         /* Send WebP for rect */
         guac_client_stream_webp(surface->client, socket, GUAC_COMP_OVER, layer,
                 surface->dirty_rect.x, surface->dirty_rect.y, rect,
                 GUAC_SURFACE_WEBP_IMAGE_QUALITY, 0);
+
         cairo_surface_destroy(rect);
         surface->realized = 1;
 
@@ -1524,3 +1531,25 @@ void guac_common_surface_flush(guac_common_surface* surface) {
 
 }
 
+void guac_common_surface_dup(guac_common_surface* surface, guac_user* user,
+        guac_socket* socket) {
+
+    /* Do nothing if not realized */
+    if (!surface->realized)
+        return;
+
+    /* Sync size to new socket */
+    guac_protocol_send_size(socket, surface->layer, surface->width, surface->height);
+
+    /* Get entire surface */
+    cairo_surface_t* rect = cairo_image_surface_create_for_data(
+            surface->buffer, CAIRO_FORMAT_RGB24,
+            surface->width, surface->height, surface->stride);
+
+    /* Send PNG for rect */
+    guac_user_stream_png(user, socket, GUAC_COMP_OVER, surface->layer,
+            0, 0, rect);
+    cairo_surface_destroy(rect);
+
+}
+

src/common/guac_surface.h

@@ -337,5 +337,21 @@ void guac_common_surface_flush(guac_common_surface* surface);
  */
 void guac_common_surface_flush_deferred(guac_common_surface* surface);
 
+/**
+ * Duplicates the contents of the current surface to the given socket. Pending
+ * changes are not flushed.
+ *
+ * @param surface
+ *     The surface to duplicate.
+ *
+ * @param user
+ *     The user receiving the surface.
+ *
+ * @param socket
+ *     The socket over which the surface contents should be sent.
+ */
+void guac_common_surface_dup(guac_common_surface* surface, guac_user* user,
+        guac_socket* socket);
+
 #endif
 

tests/Makefile.am

@@ -28,6 +28,7 @@ check_PROGRAMS = test_libguac
 
 noinst_HEADERS =          \
     client/client_suite.h \
+    common/common_suite.h \
     protocol/suite.h      \
     util/util_suite.h
 
@@ -36,6 +37,10 @@ test_libguac_SOURCES =           \
     client/client_suite.c        \
     client/buffer_pool.c         \
     client/layer_pool.c          \
+    common/common_suite.c        \
+    common/guac_iconv.c          \
+    common/guac_string.c         \
+    common/guac_rect.c           \
     protocol/suite.c             \
     protocol/base64_decode.c     \
     protocol/instruction_parse.c \
@@ -48,9 +53,11 @@ test_libguac_SOURCES =           \
 
 test_libguac_CFLAGS =       \
     -Werror -Wall -pedantic \
+    @COMMON_INCLUDE@        \
     @LIBGUAC_INCLUDE@
 
 test_libguac_LDADD = \
+    @COMMON_LTLIB@   \
     @CUNIT_LIBS@     \
     @LIBGUAC_LTLIB@