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vnc: add support for extended desktop resize

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The extended desktop resize encoding adds support for (a) clients
sending resize requests to the server, and (b) multihead support.

This patch implements (a).  All resize requests are rejected by qemu.
Qemu can't resize the framebuffer on its own, this is in the hands of
the guest, so all qemu can do is forward the request to the guest.
Should the guest actually resize the framebuffer we can notify the vnc
client later with a separate message.

This requires support in the display device.  Works with virtio-gpu.

https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#extendeddesktopsize-pseudo-encoding

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20210112134120.2031837-4-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2021-01-12 14:41:20 +01:00
parent 9e1632ad07
commit 763deea7e9
2 changed files with 65 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
ui/vnc.c
View File

@ -655,10 +655,35 @@ void vnc_framebuffer_update(VncState *vs, int x, int y, int w, int h,
vnc_write_s32(vs, encoding);
}
static void vnc_desktop_resize_ext(VncState *vs, int reject_reason)
{
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
vnc_write_u16(vs, 1); /* number of rects */
vnc_framebuffer_update(vs,
reject_reason ? 1 : 0,
reject_reason,
vs->client_width, vs->client_height,
VNC_ENCODING_DESKTOP_RESIZE_EXT);
vnc_write_u8(vs, 1); /* number of screens */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u8(vs, 0); /* padding */
vnc_write_u32(vs, 0); /* screen id */
vnc_write_u16(vs, 0); /* screen x-pos */
vnc_write_u16(vs, 0); /* screen y-pos */
vnc_write_u16(vs, vs->client_width);
vnc_write_u16(vs, vs->client_height);
vnc_write_u32(vs, 0); /* screen flags */
vnc_unlock_output(vs);
vnc_flush(vs);
}
static void vnc_desktop_resize(VncState *vs)
{
if (vs->ioc == NULL || !vnc_has_feature(vs, VNC_FEATURE_RESIZE)) {
if (vs->ioc == NULL || (!vnc_has_feature(vs, VNC_FEATURE_RESIZE) &&
!vnc_has_feature(vs, VNC_FEATURE_RESIZE_EXT))) {
return;
}
@ -668,6 +693,12 @@ static void vnc_desktop_resize(VncState *vs)
pixman_image_get_height(vs->vd->server) >= 0);
vs->client_width = pixman_image_get_width(vs->vd->server);
vs->client_height = pixman_image_get_height(vs->vd->server);
if (vnc_has_feature(vs, VNC_FEATURE_RESIZE_EXT)) {
vnc_desktop_resize_ext(vs, 0);
return;
}
vnc_lock_output(vs);
vnc_write_u8(vs, VNC_MSG_SERVER_FRAMEBUFFER_UPDATE);
vnc_write_u8(vs, 0);
@ -2114,6 +2145,9 @@ static void set_encodings(VncState *vs, int32_t *encodings, size_t n_encodings)
case VNC_ENCODING_DESKTOPRESIZE:
vs->features |= VNC_FEATURE_RESIZE_MASK;
break;
case VNC_ENCODING_DESKTOP_RESIZE_EXT:
vs->features |= VNC_FEATURE_RESIZE_EXT_MASK;
break;
case VNC_ENCODING_POINTER_TYPE_CHANGE:
vs->features |= VNC_FEATURE_POINTER_TYPE_CHANGE_MASK;
break;
@ -2474,6 +2508,34 @@ static int protocol_client_msg(VncState *vs, uint8_t *data, size_t len)
break;
}
break;
case VNC_MSG_CLIENT_SET_DESKTOP_SIZE:
{
size_t size;
uint8_t screens;
if (len < 8) {
return 8;
}
screens = read_u8(data, 6);
size = 8 + screens * 16;
if (len < size) {
return size;
}
if (dpy_ui_info_supported(vs->vd->dcl.con)) {
QemuUIInfo info;
memset(&info, 0, sizeof(info));
info.width = read_u16(data, 2);
info.height = read_u16(data, 4);
dpy_set_ui_info(vs->vd->dcl.con, &info);
vnc_desktop_resize_ext(vs, 4 /* Request forwarded */);
} else {
vnc_desktop_resize_ext(vs, 3 /* Invalid screen layout */);
}
break;
}
default:
VNC_DEBUG("Msg: %d\n", data[0]);
vnc_client_error(vs);

2
ui/vnc.h
View File

@ -444,6 +444,7 @@ enum {
enum VncFeatures {
VNC_FEATURE_RESIZE,
VNC_FEATURE_RESIZE_EXT,
VNC_FEATURE_HEXTILE,
VNC_FEATURE_POINTER_TYPE_CHANGE,
VNC_FEATURE_WMVI,
@ -459,6 +460,7 @@ enum VncFeatures {
};
#define VNC_FEATURE_RESIZE_MASK (1 << VNC_FEATURE_RESIZE)
#define VNC_FEATURE_RESIZE_EXT_MASK (1 << VNC_FEATURE_RESIZE_EXT)
#define VNC_FEATURE_HEXTILE_MASK (1 << VNC_FEATURE_HEXTILE)
#define VNC_FEATURE_POINTER_TYPE_CHANGE_MASK (1 << VNC_FEATURE_POINTER_TYPE_CHANGE)
#define VNC_FEATURE_WMVI_MASK (1 << VNC_FEATURE_WMVI)