Can DirectX's ImageFileFormat jpeg compression be set? If yes, how?

[Peter Porter]

I've been testing a way to screen capture with DirectX, but haven't been able to find any code to set the compression of jpegs for ImageFileFormat while saving. Is it even possible to set jpeg's compression with ImageFileFormat? Is there another way to save DirectX captured images to jpegs of a higher compression?

The DirectX SDK I'm using is from 2010. The only version compatible with my machine. A full copy of this old SDK can be downloaded from the Wayback Machine's archive of it's Microsoft's download page:
https://web.archive.org/web/20161203...n.aspx?id=6812

The code below references DirectX, Direct3D, and Direct3DX dll's from this directory:
C:\Windows\Microsoft.NET\DirectX for Managed Code\1.0.2902.01.0.29

The project's target framework is set to .Net 3.5 Client Profile, and under Configuration Manager, Active and Platform is set to x86.


Update: Forgot to set the code to save jpegs. It does now, so running it shows it's crappy compression.

Option Strict On

Imports Microsoft.DirectX
Imports Microsoft.DirectX.Direct3D

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim present As New PresentParameters
        present.Windowed = True
        present.SwapEffect = SwapEffect.Flip

        Dim device As Device
        device = New Device(0, DeviceType.Hardware, Me.Handle, CreateFlags.SoftwareVertexProcessing, present)

        Dim backbuffer As Surface = device.CreateOffscreenPlainSurface(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, Format.A8R8G8B8, Pool.SystemMemory)
        device.GetFrontBufferData(0, backbuffer)

        SurfaceLoader.Save("C:\Users\Web\Desktop\Screenshot.jpg", ImageFileFormat.jpg, backbuffer)

        backbuffer.Dispose()
        device.Dispose()

    End Sub

End Class

Note: Saving a captured image as a bmp looks great (huge file size), but strangely when you save as a png, my app ignores the desktop's wallpaper, replacing it with a transparent background, and also the names of the desktop icons becomes transparent.