Code:
Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Declare Function GetPixel Lib "gdi32" (ByVal hdc As Long, ByVal X As Long, ByVal Y As Long) As Long
Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Declare Function SetWindowRgn Lib "user32" (ByVal hwnd As Long, ByVal hRgn As Long, ByVal bRedraw As Long) As Long
Declare Function CombineRgn Lib "gdi32" (ByVal hDestRgn As Long, ByVal hSrcRgn1 As Long, ByVal hSrcRgn2 As Long, ByVal nCombineMode As Long) As Long
Sub FormLoad(frm As Form)
Dim maskcolor As Long 'declare variable for the transparent color
'set transparent color as great pink
maskcolor = RGB(255, 0, 255)
'perform function to make windows transparent
TransBack 0, 0, frm.Width / 15, frm.Height / 15, maskcolor, frm.hdc, frm.hwnd
End Sub
Sub PicLoad(pic As PictureBox)
Dim maskcolor As Long 'declare variable for the transparent color
'set transparent color as great pink
maskcolor = RGB(255, 0, 255)
'perform function to make pictures transparent
TransBack 0, 0, pic.Width / 15, pic.Height / 15, maskcolor, pic.hdc, pic.hwnd
End Sub
Private Sub TransBack(ByVal xstart As Long, ByVal ystart As Long, ByVal xend As Long, ByVal yend As Long, ByVal bgcolor As Long, ByVal thdc As Long, ByVal thWnd As Long)
'declare region variables
Dim rgn2 As Long, rgn3 As Long, rgn4 As Long
'declare substitute variables for the function parameters
Dim Top As Long, Left As Long, Right As Long, Bottom As Long, temptop As Long
'create some region buffers
rgn = CreateRectRgn(0, 0, 0, 0)
rgn2 = CreateRectRgn(0, 0, 0, 0)
rgn3 = CreateRectRgn(0, 0, 0, 0)
'this loop picks out the transparent colors,
'there MUST be three loops or Windows has a hard
'time handling the complex regions
Left = xstart
Right = (xend - xstart) + 1: Bottom = (yend - ystart) + 1
Do While Left < Right 'go through and scan left to right
Top = ystart
Do While Top < Bottom 'go through and scan top to botom
If GetPixel(thdc, Left, Top) <> bgcolor Then
temptop = Top
Do While GetPixel(thdc, Left, Top + 1) <> bgcolor
Top = Top + 1
If Top = Bottom Then Exit Do
Loop
rgn4 = CreateRectRgn(Left, temptop, Left + 1, Top + 1)
CombineRgn rgn3, rgn2, rgn2, 5
CombineRgn rgn2, rgn4, rgn3, 2
DeleteObject rgn4
End If
Top = Top + 1
Loop
CombineRgn rgn3, rgn, rgn, 5
CombineRgn rgn, rgn2, rgn3, 2
DoEvents
Left = Left + 1
Loop
DeleteObject rgn2
SetWindowRgn thWnd, rgn, True
End Sub