diff mbox series

[v3,3/3] vnc: add support for extended desktop resize

Message ID 20210112134120.2031837-4-kraxel@redhat.com (mailing list archive)
State New, archived
Headers show
Series vnc: support some new extensions. | expand

Commit Message

Gerd Hoffmann Jan. 12, 2021, 1:41 p.m. UTC
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>
---
 ui/vnc.h |  2 ++
 ui/vnc.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

Comments

Daniel P. Berrangé Jan. 14, 2021, 5:43 p.m. UTC | #1
On Tue, Jan 12, 2021 at 02:41:20PM +0100, Gerd Hoffmann wrote:
> 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>
> ---
>  ui/vnc.h |  2 ++
>  ui/vnc.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 65 insertions(+), 1 deletion(-)


Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
diff mbox series

Patch

diff --git a/ui/vnc.h b/ui/vnc.h
index c8d3ad9ec496..77a310947bd6 100644
--- a/ui/vnc.h
+++ b/ui/vnc.h
@@ -442,6 +442,7 @@  enum {
 
 enum VncFeatures {
     VNC_FEATURE_RESIZE,
+    VNC_FEATURE_RESIZE_EXT,
     VNC_FEATURE_HEXTILE,
     VNC_FEATURE_POINTER_TYPE_CHANGE,
     VNC_FEATURE_WMVI,
@@ -456,6 +457,7 @@  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)
diff --git a/ui/vnc.c b/ui/vnc.c
index 8df63b349b38..d4a161ac1393 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -654,10 +654,35 @@  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;
     }
 
@@ -667,6 +692,12 @@  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);
@@ -2102,6 +2133,9 @@  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;
@@ -2420,6 +2454,34 @@  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);