graphics - SlimDX GDI 位图到 Direct2D 位图的比例约为 1.5 - 2 X

Question

我正在使用https://code.google.com/p/slimdx/issues/detail?id=707上的代码将 System.Drawing.Bitmap 转换为 SlimDX.Direct2D.Bitmap。我之前使用过E X A C T L Y相同的代码，如果运行良好。现在，当我用

Dim TheBitmap As SlimDX.Direct2D.Bitmap = LoadBitmap(New Bitmap(New MemoryStream(TheBytesThatIGotOffTheNetworkStream)))
SlimDX.Direct2D.WindowRenderTarget.DrawBitmap(TheBitmap)

我得到一个已缩放 1.5 到 2 倍的位图。如果我保存 System.Drawing.Bitmap，那就完美了。我以前做过这个，它从来没有扩展过。我什至尝试摆脱流并从硬盘加载位图。它没有用。谢谢。

我的代码：

表格1.vb：

Imports SlimDX
Imports System.Text
Imports System.Threading
Imports System.IO
Public Class Form1
    Dim F As Direct2D.Factory
    Dim WRTP As Direct2D.WindowRenderTargetProperties
    Dim WRT As Direct2D.WindowRenderTarget
    Dim TheBitmap As Direct2D.Bitmap
    Function LoadBitmap(drawingBitmap As Bitmap) As Direct2D.Bitmap
        Dim result As Direct2D.Bitmap = Nothing
        Dim drawingBitmapData As BitmapData = drawingBitmap.LockBits(New Rectangle(0, 0, drawingBitmap.Width, drawingBitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppPArgb)
        Dim dataStreamxx As DataStream = New DataStream(drawingBitmapData.Scan0, drawingBitmapData.Stride * drawingBitmapData.Height, True, False)
        Dim properties As Direct2D.BitmapProperties = New Direct2D.BitmapProperties()
        properties.PixelFormat = New Direct2D.PixelFormat(DXGI.Format.R8G8B8A8_UNorm, Direct2D.AlphaMode.Premultiplied)
        result = New Direct2D.Bitmap(WRT, New Size(drawingBitmap.Width, drawingBitmap.Height), dataStreamxx, drawingBitmapData.Stride, properties)
        drawingBitmap.UnlockBits(drawingBitmapData)
        Return result
    End Function
    Public Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        F = New Direct2D.Factory()
        WRTP = New Direct2D.WindowRenderTargetProperties()
        WRTP.Handle = Me.Handle
        WRTP.PixelSize = Me.PixelSize
        WRT = New Direct2D.WindowRenderTarget(F, WRTP)
    End Sub
    Public Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles MyBase.Paint
        WRT.BeginDraw()
        WRT.Clear()
        If Not IsNothing(TheBitmap) Then
            WRT.DrawBitmap(TheBitmap)
        End If
        WRT.EndDraw()
    End Sub
    Sub Main()
        Dim Command As TCP.Command
        While True
            If TCP.Listener.Pending() Then
                TCP.Clients.Add(TCP.Listener.AcceptTcpClient())
                TCP.Streams.Add(TCP.Clients.Last().GetStream())
            End If
            For a=0 To TCP.Clients.Count-1
                If TCP.Streams(a).DataAvailable Then
                    Command=TCP.ReadCommand(TCP.Streams(a))
                    If Encoding.ASCII.GetString(Command.Command) = "Bitmap"
                        TheBitmap=LoadBitmap(New Bitmap(New MemoryStream(Command.SubCommands(0))) 'Convert it.
                        Me.Invalidate()
                    End If
                End If
            Next
        End While
    End Sub
End Class

Answer 1

我解决了。不是真的，但我只是再次翻译它，完全一样，它的工作原理。