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BitMap Contour To Windows Region

, 16 Sep 2005
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An article on how to generate an outline of a bitmap. Used when designing user shaped dialogs.

Sample screenshot


The CBitmapHandling class was designed to calculate the contour points in a bitmap. It looks at the bitmap and finds pixel points different from white, it then places these start and stop pixel points in a Vertex of CPoint class. When it has found the outline of the bitmap, it then generates a Windows region. If you use this region in your OnInitDialog and then set the window region using SetWindowRgn(m_WinRgn, TRUE ), your window will then be shaped like the outline.

Using the code

The code consists of a header file and a CPP file.

#include "BitMapHandling.h"
using namespace HandlingBitmaps;

BOOL CMyShapedWindowDlg::OnInitDialog()
 VERIFY( SetWindowPos( NULL, 0, 0, m_nW, 
         m_nH, SWP_NOMOVE | SWP_NOOWNERZORDER ) ); // size and pos. of window
         // cut of areas of region, which you do not really need. 
         // fx. maybe you have bitmap buttons drawn under your bitmap window.
 CBitmapHandling bh;
 bh.BitMapContourToWinRgn(&m_WinRgn, IDB_BITMAP);
 VERIFY( SetWindowRgn(m_WinRgn , TRUE ) );

 return TRUE; // return TRUE unless you set the focus to a control


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Software Developer (Senior) Nokia
Denmark Denmark
I have been working with languages ranging from assembly 68000 to COBOL, OOC, MySQL, Perl, VC++ MFC and WinSockets.
I am currently working as a senior software architect at Nokia Mobile Phones Denmark
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Comments and Discussions

GeneralDemo Project Pinmembergancev18-Apr-07 3:14 
GeneralBitmap PinmemberSangeetha_J25-Jan-07 20:17 
Hi Serup,
I came to know your article while searching for concepts related to contour. Am working as a software engineer in Visual C++ for the past two years. No one is here for me to train. Am reading for myself and doing things as much as my effort makes it possible. Now am in a need to accomplish the following one:
1. I need to show a bitmap in a full screen mode
2. Then i need to scatter that bitmap here and there all over the screen and then have to reassemble it to make it return back to its original form.
I had posted one message asking about this. Then i got the reply to look for finding contours of that bitmap and then to carry on from there. One more reply suggested me to study about 3DMax.
Now i posted this to have your ideas and suggestions. If there any book for me to read and proceed, please refer to me. I am ready to read and implement the procedure.
My email id is
Thanking you,
With Regards,
With Regards,

Generalembedded systems Pinmemberjamal odibat18-Sep-05 21:05 
GeneralBetter solution Pinmemberserup31-Aug-05 2:15 
GeneralRe: Better solution Pinmemberserup31-Aug-05 2:35 
GeneralSome Bugs Pinmembernebbi27-Jan-04 21:47 
GeneralRe: Some Bugs Pinmemberserup28-Jan-04 20:32 
GeneralA guess (or two) at your low mark... PinmemberIain Clarke26-Nov-03 5:10 
GeneralRe: A guess (or two) at your low mark... PinsitebuilderUwe Keim26-Nov-03 5:25 
GeneralRe: A guess (or two) at your low mark... PinmemberIain Clarke26-Nov-03 5:33 
GeneralRe: A guess (or two) at your low mark... Pinmemberserup27-Nov-03 3:38 
GeneralRe: A guess (or two) at your low mark... Pinmembergordon8824-Jul-08 12:50 

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