rfbproto.h

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 * Raw Encoding.  Pixels are sent in top-to-bottom scanline order,
 * left-to-right within a scanline with no padding in between.
 */


/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * CopyRect Encoding.  The pixels are specified simply by the x and y position
 * of the source rectangle.
 */

typedef struct {
    CARD16 srcX;
    CARD16 srcY;
} rfbCopyRect;

#define sz_rfbCopyRect 4


/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * RRE - Rise-and-Run-length Encoding.  We have an rfbRREHeader structure
 * giving the number of subrectangles following.  Finally the data follows in
 * the form [<bgpixel><subrect><subrect>...] where each <subrect> is
 * [<pixel><rfbRectangle>].
 */

typedef struct {
    CARD32 nSubrects;
} rfbRREHeader;

#define sz_rfbRREHeader 4


/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * CoRRE - Compact RRE Encoding.  We have an rfbRREHeader structure giving
 * the number of subrectangles following.  Finally the data follows in the form
 * [<bgpixel><subrect><subrect>...] where each <subrect> is
 * [<pixel><rfbCoRRERectangle>].  This means that
 * the whole rectangle must be at most 255x255 pixels.
 */

typedef struct {
    CARD8 x;
    CARD8 y;
    CARD8 w;
    CARD8 h;
} rfbCoRRERectangle;

#define sz_rfbCoRRERectangle 4


/*- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 * Hextile Encoding.  The rectangle is divided up into "tiles" of 16x16 pixels,
 * starting at the top left going in left-to-right, top-to-bottom order.  If
 * the width of the rectangle is not an exact multiple of 16 then the width of
 * the last tile in each row will be correspondingly smaller.  Similarly if the
 * height is not an exact multiple of 16 then the height of each tile in the
 * final row will also be smaller.  Each tile begins with a "subencoding" type
 * byte, which is a mask made up of a number of bits.  If the Raw bit is set
 * then the other bits are irrelevant; w*h pixel values follow (where w and h
 * are the width and height of the tile).  Otherwise the tile is encoded in a
 * similar way to RRE, except that the position and size of each subrectangle
 * can be specified in just two bytes.  The other bits in the mask are as
 * follows:
 *
 * BackgroundSpecified - if set, a pixel value follows which specifies
 *    the background colour for this tile.  The first non-raw tile in a
 *    rectangle must have this bit set.  If this bit isn't set then the
 *    background is the same as the last tile.
 *
 * ForegroundSpecified - if set, a pixel value follows which specifies
 *    the foreground colour to be used for all subrectangles in this tile.
 *    If this bit is set then the SubrectsColoured bit must be zero.
 *
 * AnySubrects - if set, a single byte follows giving the number of
 *    subrectangles following.  If not set, there are no subrectangles (i.e.
 *    the whole tile is just solid background colour).
 *
 * SubrectsColoured - if set then each subrectangle is preceded by a pixel
 *    value giving the colour of that subrectangle.  If not set, all
 *    subrectangles are the same colour, the foreground colour;  if the
 *    ForegroundSpecified bit wasn't set then the foreground is the same as
 *    the last tile.
 *
 * The position and size of each subrectangle is specified in two bytes.  The
 * Pack macros below can be used to generate the two bytes from x, y, w, h,
 * and the Extract macros can be used to extract the x, y, w, h values from
 * the two bytes.
 */

#define rfbHextileRaw			(1 << 0)
#define rfbHextileBackgroundSpecified	(1 << 1)
#define rfbHextileForegroundSpecified	(1 << 2)
#define rfbHextileAnySubrects		(1 << 3)
#define rfbHextileSubrectsColoured	(1 << 4)

#define rfbHextilePackXY(x,y) (((x) << 4) | (y))
#define rfbHextilePackWH(w,h) ((((w)-1) << 4) | ((h)-1))
#define rfbHextileExtractX(byte) ((byte) >> 4)
#define rfbHextileExtractY(byte) ((byte) & 0xf)
#define rfbHextileExtractW(byte) (((byte) >> 4) + 1)
#define rfbHextileExtractH(byte) (((byte) & 0xf) + 1)


/*-----------------------------------------------------------------------------
 * SetColourMapEntries - these messages are only sent if the pixel
 * format uses a "colour map" (i.e. trueColour false) and the client has not
 * fixed the entire colour map using FixColourMapEntries.  In addition they
 * will only start being sent after the client has sent its first
 * FramebufferUpdateRequest.  So if the client always tells the server to use
 * trueColour then it never needs to process this type of message.
 */

typedef struct {
    CARD8 type;			/* always rfbSetColourMapEntries */
    CARD8 pad;
    CARD16 firstColour;
    CARD16 nColours;

    /* Followed by nColours * 3 * CARD16
       r1, g1, b1, r2, g2, b2, r3, g3, b3, ..., rn, bn, gn */

} rfbSetColourMapEntriesMsg;

#define sz_rfbSetColourMapEntriesMsg 6



/*-----------------------------------------------------------------------------
 * Bell - ring a bell on the client if it has one.
 */

typedef struct {
    CARD8 type;			/* always rfbBell */
} rfbBellMsg;

#define sz_rfbBellMsg 1



/*-----------------------------------------------------------------------------
 * ServerCutText - the server has new text in its cut buffer.
 */

typedef struct {
    CARD8 type;			/* always rfbServerCutText */
    CARD8 pad1;
    CARD16 pad2;
    CARD32 length;
    /* followed by char text[length] */
} rfbServerCutTextMsg;

#define sz_rfbServerCutTextMsg 8


/*-----------------------------------------------------------------------------
 * Union of all server->client messages.
 */

typedef union {
    CARD8 type;
    rfbFramebufferUpdateMsg fu;
    rfbSetColourMapEntriesMsg scme;
    rfbBellMsg b;
    rfbServerCutTextMsg sct;
} rfbServerToClientMsg;



/*****************************************************************************
 *
 * Message definitions (client -> server)
 *
 *****************************************************************************/


/*-----------------------------------------------------------------------------
 * SetPixelFormat - tell the RFB server the format in which the client wants
 * pixels sent.
 */

typedef struct {
    CARD8 type;			/* always rfbSetPixelFormat */
    CARD8 pad1;
    CARD16 pad2;
    rfbPixelFormat format;
} rfbSetPixelFormatMsg;

#define sz_rfbSetPixelFormatMsg (sz_rfbPixelFormat + 4)


/*-----------------------------------------------------------------------------
 * FixColourMapEntries - when the pixel format uses a "colour map", fix
 * read-only colour map entries.
 *
 *    ***************** NOT CURRENTLY SUPPORTED *****************
 */

typedef struct {
    CARD8 type;			/* always rfbFixColourMapEntries */
    CARD8 pad;
    CARD16 firstColour;
    CARD16 nColours;

    /* Followed by nColours * 3 * CARD16
       r1, g1, b1, r2, g2, b2, r3, g3, b3, ..., rn, bn, gn */

} rfbFixColourMapEntriesMsg;

#define sz_rfbFixColourMapEntriesMsg 6


/*-----------------------------------------------------------------------------
 * SetEncodings - tell the RFB server which encoding types we accept.  Put them
 * in order of preference, if we have any.  We may always receive raw
 * encoding, even if we don't specify it here.
 */

typedef struct {
    CARD8 type;			/* always rfbSetEncodings */
    CARD8 pad;
    CARD16 nEncodings;
    /* followed by nEncodings * CARD32 encoding types */
} rfbSetEncodingsMsg;

#define sz_rfbSetEncodingsMsg 4


/*-----------------------------------------------------------------------------
 * FramebufferUpdateRequest - request for a framebuffer update.  If incremental
 * is true then the client just wants the changes since the last update.  If
 * false then it wants the whole of the specified rectangle.
 */

typedef struct {
    CARD8 type;			/* always rfbFramebufferUpdateRequest */
    CARD8 incremental;
    CARD16 x;
    CARD16 y;
    CARD16 w;
    CARD16 h;
} rfbFramebufferUpdateRequestMsg;

#define sz_rfbFramebufferUpdateRequestMsg 10


/*-----------------------------------------------------------------------------
 * KeyEvent - key press or release
 *
 * Keys are specified using the "keysym" values defined by the X Window System.
 * For most ordinary keys, the keysym is the same as the corresponding ASCII
 * value.  Other common keys are:
 *
 * BackSpace		0xff08
 * Tab			0xff09
 * Return or Enter	0xff0d
 * Escape		0xff1b
 * Insert		0xff63
 * Delete		0xffff
 * Home			0xff50
 * End			0xff57
 * Page Up		0xff55
 * Page Down		0xff56
 * Left			0xff51
 * Up			0xff52
 * Right		0xff53
 * Down			0xff54
 * F1			0xffbe
 * F2			0xffbf
 * ...			...
 * F12			0xffc9
 * Shift		0xffe1
 * Control		0xffe3
 * Meta			0xffe7
 * Alt			0xffe9
 */

typedef struct {
    CARD8 type;			/* always rfbKeyEvent */
    CARD8 down;			/* true if down (press), false if up */
    CARD16 pad;
    CARD32 key;			/* key is specified as an X keysym */
} rfbKeyEventMsg;

#define sz_rfbKeyEventMsg 8


/*-----------------------------------------------------------------------------
 * PointerEvent - mouse/pen move and/or button press.
 */

typedef struct {
    CARD8 type;			/* always rfbPointerEvent */
    CARD8 buttonMask;		/* bits 0-7 are buttons 1-8, 0=up, 1=down */
    CARD16 x;
    CARD16 y;
} rfbPointerEventMsg;

#define rfbButton1Mask 1
#define rfbButton2Mask 2
#define rfbButton3Mask 4

#define sz_rfbPointerEventMsg 6



/*-----------------------------------------------------------------------------
 * ClientCutText - the client has new text in its cut buffer.
 */

typedef struct {
    CARD8 type;			/* always rfbClientCutText */
    CARD8 pad1;
    CARD16 pad2;
    CARD32 length;
    /* followed by char text[length] */
} rfbClientCutTextMsg;

#define sz_rfbClientCutTextMsg 8



/*-----------------------------------------------------------------------------
 * Union of all client->server messages.
 */

typedef union {
    CARD8 type;
    rfbSetPixelFormatMsg spf;
    rfbFixColourMapEntriesMsg fcme;
    rfbSetEncodingsMsg se;
    rfbFramebufferUpdateRequestMsg fur;
    rfbKeyEventMsg ke;
    rfbPointerEventMsg pe;
    rfbClientCutTextMsg cct;
} rfbClientToServerMsg;