[VB6 - DIB's] - advices for speed up my Graphic Class

[joaquim]

i need advices for speed my class. it takes very time to Draw the image

- GetImageData sub: here is catch the image from a control(picturebox and form and usercontrol);
- ChangeImage sub: here i change the image pixels;
- DrawImage sub: is for draw the image.

i see more when i tiled the image. can anyone advice for speed up my class?

[joaquim]

i have did some changes and i have seen the tiles need very time to be showed

Public Sub DrawImage(Picture As Object, Optional x As Long = 0, Optional y As Long = 0, Optional Width As Long = 0, Optional Height As Long = 0)
    Dim lngTileX As Long
    Dim lngTileY As Long
    Dim lngTileLimitX As Long
    Dim lngTileLimitY As Long
    
    Call ChangeImage
    If Width = 0 Then Width = outWidth
    If Height = 0 Then Height = outHeight
        
    With bi32BitInfo.bmiHeader
        .biBitCount = 32
        .biPlanes = 1
        .biSize = Len(bi32BitInfo.bmiHeader)
        .biWidth = outWidth
        .biHeight = outHeight
        .biSizeImage = 4 * outWidth * outHeight
    End With

      
    'draw image transparent or not
    'draw image mirrored or not
    If blnTiles = True Then
        lngTileLimitX = Picture.ScaleWidth
        lngTileLimitY = Picture.ScaleHeight
    Else
        lngTileLimitX = 1
        lngTileLimitY = 1
    End If
    
    For lngTileY = 0 To lngTileLimitY Step outHeight
        For lngTileX = 0 To lngTileLimitX Step outWidth
            If msMirrorState = None Then
                If blnTransparent = False Then
                    StretchDIBits Picture.hdc, lngTileX, lngTileY, Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcCopy
                ElseIf blnTransparent = True Then
                    StretchDIBits Picture.hdc, lngTileX, lngTileY, Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                    StretchDIBits Picture.hdc, lngTileX, lngTileY, Width, Height, 0, 0, _
                        outWidth, outHeight, MaskImage(0, 0), bi32BitInfo, 0, vbSrcAnd
                    StretchDIBits Picture.hdc, lngTileX, lngTileY, Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                End If
            ElseIf msMirrorState = Horizontal Then
                If blnTransparent = False Then
                    StretchDIBits Picture.hdc, Width + lngTileX, lngTileY, -Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcCopy
                ElseIf blnTransparent = True Then
                    StretchDIBits Picture.hdc, Width + lngTileX, lngTileY, -Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                    StretchDIBits Picture.hdc, Width + lngTileX, lngTileY, -Width, Height, 0, 0, _
                        outWidth, outHeight, MaskImage(0, 0), bi32BitInfo, 0, vbSrcAnd
                    StretchDIBits Picture.hdc, Width + lngTileX, lngTileY, -Width, Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                End If
            ElseIf msMirrorState = Vertical Then
                If blnTransparent = False Then
                    StretchDIBits Picture.hdc, lngTileX, Height + lngTileY, Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcCopy
                ElseIf blnTransparent = True Then
                    StretchDIBits Picture.hdc, lngTileX, Height + lngTileY, Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                    StretchDIBits Picture.hdc, lngTileX, Height + lngTileY, Width, -Height, 0, 0, _
                        outWidth, outHeight, MaskImage(0, 0), bi32BitInfo, 0, vbSrcAnd
                    StretchDIBits Picture.hdc, lngTileX, Height + lngTileY, Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                End If
            ElseIf msMirrorState = HorizontalVertical Then
                If blnTransparent = False Then
                    StretchDIBits Picture.hdc, Width + lngTileX, Height + lngTileY, -Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcCopy
                ElseIf blnTransparent = True Then
                    StretchDIBits Picture.hdc, Width + lngTileX, Height + lngTileY, -Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                    StretchDIBits Picture.hdc, Width + lngTileX, Height + lngTileY, -Width, -Height, 0, 0, _
                        outWidth, outHeight, MaskImage(0, 0), bi32BitInfo, 0, vbSrcAnd
                    StretchDIBits Picture.hdc, Width + lngTileX, Height + lngTileY, -Width, -Height, 0, 0, _
                        outWidth, outHeight, ChangedImage(0, 0), bi32BitInfo, 0, vbSrcInvert
                End If
            End If
        Next lngTileX
    Next lngTileY
End Sub

someone can advice me how can i speed up these for's(that i use for show the image and tile it, if is selected)?