[Qemu-devel] QEMU RFB (vnc) driver

[Matthew Mastracci <matt@aclaro.com>]

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I'm working on adding RFB support for QEMU.  I've attached my
work-in-progress here.  You'll need to compile and link against
libvncserver to make it work- I'm not an autoconf wizard, so I just
hacked my local version for now.

The whole thing works surprisingly well.  I managed to talk to QEMU on
my Linux box from my LAN-connected Windows box with amazing performance.

It's a bit of a pain using the mouse over VNC since everything is done
using relative position packets.  It might be possible to emulate a
Synaptics PS/2 touchpad (which supports absolute positioning and is
supported under Windows and X) to make this a bit easier, but I'm not
certain how difficult that would be.  It might be easier to whip up a
special VNC client that supports mouse capturing.  :)

I've also left the keymapping as a "work in progress" until I find an
easy way to map from the vnc codes (which seem to be X codes) to the
PC-101 scancodes.  Any ideas?

-- 
Matthew Mastracci <matt@aclaro.com>

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/*
 * QEMU VNC display driver
 * 
 * Copyright (c) 2003 Fabrice Bellard
 * 
 * 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 "vl.h"

#include <rfb/rfb.h>

#ifndef _WIN32
#include <signal.h>
#endif

rfbScreenInfoPtr rfbScreen;
int last_x_position;
int last_y_position;

static void vnc_update(DisplayState *ds, int x, int y, int w, int h)
{
//    printf("updating x=%d y=%d w=%d h=%d\n", x, y, w, h);
    rfbMarkRectAsModified(rfbScreen, x, y, x+w, y+h);
}

static void vnc_resize(DisplayState *ds, int w, int h)
{
    printf("resize! w=%i h=%i\n", w, h);
    ds->data = rfbScreen->frameBuffer + ( 1024 - w ) + ( 768 - h ) * 1024;
    ds->linesize = 1024*2;
    ds->depth = 16;
    rfbFillRect(rfbScreen, 0, 0, 1023, 767, 0);
}

static void vnc_refresh(DisplayState *ds)
{
    vga_update_display();  
//    rfbProcessEvents(rfbScreen,1000000);
}

static void vnc_pointer(int buttonMask, int x, int y, rfbClientPtr cl)
{
    int dx, dy, buttons;
    dx = x - last_x_position;
    last_x_position = x;
    dy = y - last_y_position;
    last_y_position = y;

	buttons = 0;

	if ( buttonMask & 1 )
		buttons |= MOUSE_EVENT_LBUTTON;
	if ( buttonMask & 2 )
		buttons |= MOUSE_EVENT_MBUTTON;
	if ( buttonMask & 4 )
		buttons |= MOUSE_EVENT_RBUTTON;

    kbd_mouse_event(dx, dy, 0, buttons);
}

static void vnc_keyboard(rfbBool down, rfbKeySym key, rfbClientPtr cl)
{
	if (key == 'A')
		if (down)
			kbd_put_keycode(0x38);
		else
			kbd_put_keycode(0x38 | 0x80);
}

void vnc_display_init(DisplayState *ds)
{
    int flags;
    last_x_position = 0;
    last_y_position = 0;

    rfbScreen = rfbGetScreen(0, NULL, 1024, 768, 5, 3, 2);
    rfbScreen->frameBuffer = (char*)malloc(1074*768*2);
    rfbScreen->rfbServerFormat.bitsPerPixel = 16;
    rfbScreen->rfbServerFormat.depth = 16;
    rfbScreen->rfbServerFormat.bigEndian = 0;
    rfbScreen->rfbServerFormat.trueColour = 1;
    rfbScreen->rfbServerFormat.redMax = (1 << 5) - 1;
    rfbScreen->rfbServerFormat.greenMax = (1 << 6) - 1;
    rfbScreen->rfbServerFormat.blueMax = (1 << 5) - 1;
    rfbScreen->rfbServerFormat.redShift = 11;
    rfbScreen->rfbServerFormat.greenShift = 5;
    rfbScreen->rfbServerFormat.blueShift = 0;

	rfbScreen->ptrAddEvent = vnc_pointer;
	rfbScreen->kbdAddEvent = vnc_keyboard;

    rfbInitServer(rfbScreen);
	rfbRunEventLoop(rfbScreen, 1000000, TRUE);

    vnc_resize(ds, 640, 480);

    ds->dpy_update = vnc_update;
    ds->dpy_resize = vnc_resize;
    ds->dpy_refresh = vnc_refresh;
}