private void HandleSetDesktopSize()
{
var message = this.c.Receive(7);
var width = BinaryPrimitives.ReadUInt16BigEndian(message.AsSpan(1, 2));
var height = BinaryPrimitives.ReadUInt16BigEndian(message.AsSpan(3, 2));
var numberOfScreens = message[5];
var screens = this.c.Receive(16 * numberOfScreens);
ExtendedDesktopSizeStatus result = ExtendedDesktopSizeStatus.Prohibited;
if (this.fbSource != null)
{
result = this.fbSource.SetDesktopSize(width, height);
}
List <Rectangle> rectangles = new List <Rectangle>();
rectangles.Add(
this.GetExtendedDesktopSizeRectangle(
ExtendedDesktopSizeReason.Client,
result));
this.SendRectangles(rectangles);
}
private Rectangle GetExtendedDesktopSizeRectangle(ExtendedDesktopSizeReason reason, ExtendedDesktopSizeStatus status)
{
// https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#extendeddesktopsize-pseudo-encoding
// The server must send an ExtendedDesktopSize rectangle in response to a FramebufferUpdateRequest with
// incremental set to zero, assuming the client has requested the ExtendedDesktopSize pseudo-encoding
// using the SetEncodings message.
byte[] encodingData = new byte[20];
// Header
encodingData[0] = 1; // number of screens
// SCREEN array
BinaryPrimitives.WriteUInt32BigEndian(encodingData.AsSpan(4, 4), 0); // Screen id
BinaryPrimitives.WriteUInt16BigEndian(encodingData.AsSpan(8, 2), 0); // X-position
BinaryPrimitives.WriteUInt16BigEndian(encodingData.AsSpan(10, 2), 0); // Y-position
BinaryPrimitives.WriteUInt16BigEndian(encodingData.AsSpan(12, 2), (ushort)this.Framebuffer.Width); // Width
BinaryPrimitives.WriteUInt16BigEndian(encodingData.AsSpan(14, 2), (ushort)this.Framebuffer.Height); // Height
BinaryPrimitives.WriteUInt16BigEndian(encodingData.AsSpan(16, 4), 0); // Flags. Currently unused.
return
(new Rectangle()
{
Region = new VncRectangle()
{
X = (int)reason,
Y = 0,
Width = this.Framebuffer.Width,
Height = this.Framebuffer.Height,
},
Contents = encodingData,
Encoding = VncEncoding.ExtendedDesktopSize,
});
}