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incubator-nuttx/graphics/vnc/server/vnc_server.h

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/****************************************************************************
* graphics/vnc/server/vnc_server.h
*
* Copyright (C) 2016 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __GRAPHICS_VNC_SERVER_VNC_SERVER_H
#define __GRAPHICS_VNC_SERVER_VNC_SERVER_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <semaphore.h>
#include <pthread.h>
#include <queue.h>
#include <nuttx/video/fb.h>
#include <nuttx/video/rfb.h>
#include <nuttx/video/vnc.h>
#include <nuttx/nx/nxglib.h>
#include <nuttx/nx/nx.h>
#include <nuttx/net/net.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration */
#ifndef CONFIG_NET_TCP_READAHEAD
# error CONFIG_NET_TCP_READAHEAD must be set to use VNC
#endif
#ifndef CONFIG_NX_UPDATE
# error CONFIG_NX_UPDATE must be set to use VNC
#endif
#if !defined(CONFIG_VNCSERVER_PROTO3p3) && !defined(CONFIG_VNCSERVER_PROTO3p8)
# error No VNC protocol selected
#endif
#if defined(CONFIG_VNCSERVER_PROTO3p3) && defined(CONFIG_VNCSERVER_PROTO3p8)
# error Too many VNC protocols selected
#endif
#ifndef CONFIG_VNCSERVER_NDISPLAYS
# define CONFIG_VNCSERVER_NDISPLAYS 1
#endif
#if defined(CONFIG_VNCSERVER_COLORFMT_RGB8)
# define RFB_COLORFMT FB_FMT_RGB8_332
# define RFB_BITSPERPIXEL 8
# define RFB_PIXELDEPTH 8
# define RFB_TRUECOLOR 1
# define RFB_RMAX 0x07
# define RFB_GMAX 0x07
# define RFB_BMAX 0x03
# define RFB_RSHIFT 5
# define RFB_GSHIFT 2
# define RFB_BSHIFT 0
#elif defined(CONFIG_VNCSERVER_COLORFMT_RGB16)
# define RFB_COLORFMT FB_FMT_RGB16_565
# define RFB_BITSPERPIXEL 16
# define RFB_PIXELDEPTH 16
# define RFB_TRUECOLOR 1
# define RFB_RMAX 0x001f
# define RFB_GMAX 0x003f
# define RFB_BMAX 0x001f
# define RFB_RSHIFT 11
# define RFB_GSHIFT 5
# define RFB_BSHIFT 0
#elif defined(CONFIG_VNCSERVER_COLORFMT_RGB32)
# define RFB_COLORFMT FB_FMT_RGB32
# define RFB_BITSPERPIXEL 32
# define RFB_PIXELDEPTH 24
# define RFB_TRUECOLOR 1
# define RFB_RMAX 0x000000ff
# define RFB_GMAX 0x000000ff
# define RFB_BMAX 0x000000ff
# define RFB_RSHIFT 16
# define RFB_GSHIFT 8
# define RFB_BSHIFT 0
#else
# error Unspecified/unsupported color format
#endif
#ifndef CONFIG_VNCSERVER_SCREENWIDTH
# define CONFIG_VNCSERVER_SCREENWIDTH 320
#endif
#ifndef CONFIG_VNCSERVER_SCREENHEIGHT
# define CONFIG_VNCSERVER_SCREENHEIGHT 240
#endif
#ifndef CONFIG_VNCSERVER_NAME
# define CONFIG_VNCSERVER_NAME "NuttX"
#endif
#ifndef CONFIG_VNCSERVER_PRIO
# define CONFIG_VNCSERVER_PRIO 100
#endif
#ifndef CONFIG_VNCSERVER_STACKSIZE
# define CONFIG_VNCSERVER_STACKSIZE 2048
#endif
#ifndef CONFIG_VNCSERVER_UPDATER_PRIO
# define CONFIG_VNCSERVER_UPDATER_PRIO 100
#endif
#ifndef CONFIG_VNCSERVER_UPDATER_STACKSIZE
# define CONFIG_VNCSERVER_UPDATER_STACKSIZE 2048
#endif
#ifndef CONFIG_VNCSERVER_INBUFFER_SIZE
# define CONFIG_VNCSERVER_INBUFFER_SIZE 80
#endif
#ifndef CONFIG_VNCSERVER_NUPDATES
# define CONFIG_VNCSERVER_NUPDATES 48
#endif
#ifndef CONFIG_VNCSERVER_UPDATE_BUFSIZE
# define CONFIG_VNCSERVER_UPDATE_BUFSIZE 4096
#endif
#define VNCSERVER_UPDATE_BUFSIZE \
(CONFIG_VNCSERVER_UPDATE_BUFSIZE + SIZEOF_RFB_FRAMEBUFFERUPDATE_S(0))
/* Local framebuffer characteristics in bytes */
#define RFB_BYTESPERPIXEL ((RFB_BITSPERPIXEL + 7) >> 3)
#define RFB_STRIDE (RFB_BYTESPERPIXEL * CONFIG_VNCSERVER_SCREENWIDTH)
#define RFB_SIZE (RFB_STRIDE * CONFIG_VNCSERVER_SCREENHEIGHT)
/* RFB Port Number */
#define RFB_PORT_BASE 5900
#define RFB_MAX_DISPLAYS CONFIG_VNCSERVER_NDISPLAYS
#define RFB_DISPLAY_PORT(d) (RFB_PORT_BASE + (d))
/* Miscellaneous */
#ifndef MIN
# define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
/* Debug */
#ifdef CONFIG_VNCSERVER_UPDATE_DEBUG
# ifdef CONFIG_CPP_HAVE_VARARGS
# define upderr(format, ...) _err(format, ##__VA_ARGS__)
# define updinfo(format, ...) _info(format, ##__VA_ARGS__)
# define updinfo(format, ...) _info(format, ##__VA_ARGS__)
# else
# define upderr _err
# define updwarn _warn
# define updinfo _info
# endif
#else
# ifdef CONFIG_CPP_HAVE_VARARGS
# define upderr(x...)
# define updwarn(x...)
# define updinfo(x...)
# else
# define upderr (void)
# define updwarn (void)
# define updinfo (void)
# endif
#endif
/****************************************************************************
* Public Types
****************************************************************************/
/* This enumeration indicates the state of the VNC server */
enum vnc_server_e
{
VNCSERVER_UNINITIALIZED = 0, /* Initial state */
VNCSERVER_INITIALIZED, /* State structured initialized, but not connected */
VNCSERVER_CONNECTED, /* Connect to a client, but not yet configured */
VNCSERVER_CONFIGURED, /* Configured and ready to transfer graphics */
VNCSERVER_RUNNING, /* Running and activly transferring graphics */
VNCSERVER_STOPPING, /* The updater has been asked to stop */
VNCSERVER_STOPPED /* The updater has stopped */
};
/* This structure is used to queue FrameBufferUpdate event. It includes a
* pointer to support singly linked list.
*/
struct vnc_fbupdate_s
{
FAR struct vnc_fbupdate_s *flink;
bool whupd; /* True: whole screen update */
struct nxgl_rect_s rect; /* The enqueued update rectangle */
};
struct vnc_session_s
{
/* Connection data */
struct socket listen; /* Listen socket */
struct socket connect; /* Connected socket */
volatile uint8_t state; /* See enum vnc_server_e */
volatile uint8_t nwhupd; /* Number of whole screen updates queued */
volatile bool change; /* True: Frambebuffer data change since last whole screen update */
/* Display geometry and color characteristics */
uint8_t display; /* Display number (for debug) */
volatile uint8_t colorfmt; /* Remote color format (See include/nuttx/fb.h) */
volatile uint8_t bpp; /* Remote bits per pixel */
volatile bool bigendian; /* True: Remote expect data in big-endian format */
volatile bool rre; /* True: Remote supports RRE encoding */
FAR uint8_t *fb; /* Allocated local frame buffer */
/* VNC client input support */
vnc_kbdout_t kbdout; /* Callout when keyboard input is received */
vnc_mouseout_t mouseout; /* Callout when keyboard input is received */
FAR void *arg; /* Argument that accompanies the callouts */
/* Updater information */
pthread_t updater; /* Updater thread ID */
/* Update list information */
struct vnc_fbupdate_s updpool[CONFIG_VNCSERVER_NUPDATES];
sq_queue_t updfree;
sq_queue_t updqueue;
sem_t freesem;
sem_t queuesem;
/* I/O buffers for misc network send/receive */
uint8_t inbuf[CONFIG_VNCSERVER_INBUFFER_SIZE];
uint8_t outbuf[VNCSERVER_UPDATE_BUFSIZE];
};
/* This structure is used to communicate start-up status between the server
* the framebuffer driver.
*/
struct fb_startup_s
{
sem_t fbinit; /* Wait for session creation */
sem_t fbconnect; /* Wait for client connection */
int16_t result; /* OK: successfully initialized */
};
/* The size of the color type in the local framebuffer */
#if defined(CONFIG_VNCSERVER_COLORFMT_RGB8)
typedef uint8_t lfb_color_t;
#elif defined(CONFIG_VNCSERVER_COLORFMT_RGB16)
typedef uint16_t lfb_color_t;
#elif defined(CONFIG_VNCSERVER_COLORFMT_RGB32)
typedef uint32_t lfb_color_t;
#else
# error Unspecified/unsupported color format
#endif
/* Color conversion function pointer types */
typedef CODE uint8_t (*vnc_convert8_t) (lfb_color_t rgb);
typedef CODE uint16_t (*vnc_convert16_t)(lfb_color_t rgb);
typedef CODE uint32_t (*vnc_convert32_t)(lfb_color_t rgb);
/****************************************************************************
* Public Data
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/* Given a display number as an index, the following array can be used to
* look-up the session structure for that display.
*/
EXTERN FAR struct vnc_session_s *g_vnc_sessions[RFB_MAX_DISPLAYS];
/* Used to synchronize the server thread with the framebuffer driver. */
EXTERN struct fb_startup_s g_fbstartup[RFB_MAX_DISPLAYS];
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: vnc_server
*
* Description:
* The VNC server daemon. This daemon is implemented as a kernel thread.
*
* Input Parameters:
* Standard kernel thread arguments (all ignored)
*
* Returned Value:
* This function does not return.
*
****************************************************************************/
int vnc_server(int argc, FAR char *argv[]);
/****************************************************************************
* Name: vnc_negotiate
*
* Description:
* Perform the VNC initialization sequence after the client has successfully
* connected to the server. Negotiate security, framebuffer and color
* properties.
*
* Input Parameters:
* session - An instance of the session structure.
*
* Returned Value:
* Returns zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int vnc_negotiate(FAR struct vnc_session_s *session);
/****************************************************************************
* Name: vnc_client_pixelformat
*
* Description:
* A Client-to-Sever SetPixelFormat message has been received. We need to
* immediately switch the output color format that we generate.
*
* Input Parameters:
* session - An instance of the session structure.
* pixelfmt - The pixel from from the received SetPixelFormat message
*
* Returned Value:
* Returns zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int vnc_client_pixelformat(FAR struct vnc_session_s *session,
FAR struct rfb_pixelfmt_s *pixelfmt);
/****************************************************************************
* Name: vnc_client_encodings
*
* Description:
* Pick out any mutually supported encodings from the Client-to-Server
* SetEncodings message
*
* Input Parameters:
* session - An instance of the session structure.
* encodings - The received SetEncodings message
*
* Returned Value:
* At present, always returns OK
*
****************************************************************************/
int vnc_client_encodings(FAR struct vnc_session_s *session,
FAR struct rfb_setencodings_s *encodings);
/****************************************************************************
* Name: vnc_start_updater
*
* Description:
* Start the updater thread
*
* Input Parameters:
* session - An instance of the session structure.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
****************************************************************************/
int vnc_start_updater(FAR struct vnc_session_s *session);
/****************************************************************************
* Name: vnc_stop_updater
*
* Description:
* Stop the updater thread
*
* Input Parameters:
* session - An instance of the session structure.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
****************************************************************************/
int vnc_stop_updater(FAR struct vnc_session_s *session);
/****************************************************************************
* Name: vnc_update_rectangle
*
* Description:
* Queue an update of the specified rectangular region on the display.
*
* Input Parameters:
* session - An instance of the session structure.
* rect - The rectanglular region to be updated.
* change - True: Frame buffer data has changed
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
****************************************************************************/
int vnc_update_rectangle(FAR struct vnc_session_s *session,
FAR const struct nxgl_rect_s *rect,
bool change);
/****************************************************************************
* Name: vnc_receiver
*
* Description:
* This function handles all Client-to-Server messages.
*
* Input Parameters:
* session - An instance of the session structure.
*
* Returned Value:
* At present, always returns OK
*
****************************************************************************/
int vnc_receiver(FAR struct vnc_session_s *session);
/****************************************************************************
* Name: vnc_rre
*
* Description:
* This function does not really do RRE encoding. It just checks if the
* update region is one color then uses the RRE encoding format to send
* the constant color rectangle.
*
* Input Parameters:
* session - An instance of the session structure.
* rect - Describes the rectangle in the local framebuffer.
*
* Returned Value:
* Zero is returned if RRE coding was not performed (but not error was)
* encountered. Otherwise, the size of the framebuffer update message
* is returned on success or a negated errno value is returned on failure
* that indicates the nature of the failure. A failure is only
* returned in cases of a network failure and unexpected internal failures.
*
****************************************************************************/
int vnc_rre(FAR struct vnc_session_s *session, FAR struct nxgl_rect_s *rect);
/****************************************************************************
* Name: vnc_raw
*
* Description:
* As a fallback, send the framebuffer update using the RAW encoding which
* must be supported by all VNC clients.
*
* Input Parameters:
* session - An instance of the session structure.
* rect - Describes the rectangle in the local framebuffer.
*
* Returned Value:
* Zero (OK) on success; A negated errno value is returned on failure that
* indicates the nature of the failure. A failure is only returned
* in cases of a network failure and unexpected internal failures.
*
****************************************************************************/
int vnc_raw(FAR struct vnc_session_s *session, FAR struct nxgl_rect_s *rect);
/****************************************************************************
* Name: vnc_key_map
*
* Description:
* Map the receive X11 keysym into something understood by NuttX and route
* that through NX to the appropriate window.
*
* Input Parameters:
* session - An instance of the session structure.
* keysym - The X11 keysym value (see include/nuttx/inputx11_keysymdef)
* keydown - True: Key pressed; False: Key released
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_NX_KBD
void vnc_key_map(FAR struct vnc_session_s *session, uint16_t keysym,
bool keydown);
#endif
/****************************************************************************
* Name: vnc_convert_rgbNN
*
* Description:
* Convert the native framebuffer color format (either RGB8 3:3:2,
* RGB16 5:6:5, or RGB32 8:8:8) to the remote framebuffer color format
* (either RGB8 2:2:2, RGB8 3:3:2, RGB16 5:5:5, RGB16 5:6:5, or RGB32
* 8:8:8)
*
* Input Parameters:
* pixel - The src color in local framebuffer format.
*
* Returned Value:
* The pixel in the remote framebuffer color format.
*
****************************************************************************/
uint8_t vnc_convert_rgb8_222(lfb_color_t rgb);
uint8_t vnc_convert_rgb8_332(lfb_color_t rgb);
uint16_t vnc_convert_rgb16_555(lfb_color_t rgb);
uint16_t vnc_convert_rgb16_565(lfb_color_t rgb);
uint32_t vnc_convert_rgb32_888(lfb_color_t rgb);
/****************************************************************************
* Name: vnc_colors
*
* Description:
* Test the update rectangle to see if it contains complex colors. If it
* contains only a few colors, then it may be a candidate for some type
* run-length encoding.
*
* Input Parameters:
* session - An instance of the session structure.
* rect - The update region in the local frame buffer.
* maxcolors - The maximum number of colors that should be returned. This
* currently cannot exceed eight.
* colors - The top 'maxcolors' most frequency colors are returned.
*
* Returned Value:
* The number of valid colors in the colors[] array are returned, the
* first entry being the most frequent. A negated errno value is returned
* if the colors cannot be determined. This would be the case if the color
* depth is > 8 and there are more than 'maxcolors' colors in the update
* rectangle.
*
****************************************************************************/
int vnc_colors(FAR struct vnc_session_s *session, FAR struct nxgl_rect_s *rect,
unsigned int maxcolors, FAR lfb_color_t *colors);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __GRAPHICS_VNC_SERVER_VNC_SERVER_H */
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