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How do I resize a CBitmap?

Posted on 2000-04-25
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Last Modified: 2013-11-20
Ive got several bitmaps of varying dimensions between 5*5 and 20*25. I need to be able to resize them programatically to a standard 16*16 bits to fit into an existing CImageList.
Any ideas how I do this? Code appreciated.

Thanks in advance
Yakky
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Question by:yakky
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Expert Comment

by:DKostov
ID: 2748931
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Expert Comment

by:captainkirk
ID: 2749164
A nice way to do this is to use a DIB or Device Independent Bitmap instead - some image processing software like PaintShop Pro will do the conversion for you. If this is of interest to you, I can provide code to load and display DIBs...
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Accepted Solution

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chensu earned 100 total points
ID: 2749655
1. Create a CBitmap with desired size using CBitmap::CreateCompatibleBitmap.

2. Create two memory DC using CDC::CreateCompatibleDC.

3. Select the original bitmap and the newly created bitmap into two memory DC respectively.

4. Use CDC::StretchBlt to copy the original bitmap to the newly created bitmap.

5. Deselect the two bitmaps from the memory DCs.
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Author Comment

by:yakky
ID: 2750527
Ok Ive got this far but have got stuck,
can anyone help
Thanks
Yakky

hSmallicon = LoadImage(0, file, IMAGE_BITMAP,0,0,LR_LOADFROMFILE);

if ((hSmallicon !=NULL))
{
   CBitmap bmp = new CBitmap;
   CBitmap ibmp;
   bmp->Attach(hSmallicon);
   CDC     dc1, dc2;  

   ibmp.CreateCompatibleBitmap&dc2,16,16);
CDC    *pWndDC;
pWndDC= AfxGetMainWnd()->GetDC();
if(pWndDC)
{
   dc1.CreateCompatibleDC(pWndDC);
   dc2.CreateCompatibleDC(pWndDC);
   AfxGetMainWnd()->ReleaseDC(pWndDC);
}
if (SelectObject(dc1,m_bmp)==NULL)
{
   TRACE("not selected m_bmp\n");
}
if (SelectObject(dc2,ibmp)==NULL)
{
   TRACE("not selected m_bmp\n");
}
      
TRACE("%d\n",
StretchBlt(dc2.m_hDC, 0, 0,16,16, dc1,0,0,16,16,SRCCOPY));
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Expert Comment

by:chensu
ID: 2751950
CBitmap bmpDest;
const int nWidth = 16, nHeight = 16;

hSmallicon = ::LoadImage(NULL, file, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

if (hSmallicon != NULL)
{
    CBitmap bmpOrig;
    bmpOrig.Attach(hSmallicon);
    BITMAP b;
    bmpOrig.GetBitmap(&b);

    CDC ScrnDC, dc1, dc2;
    ScrnDC.CreateIC(_T("DISPLAY"), NULL, NULL, NULL);
    dc1.CreateCompatibleDC(&ScrnDC);
    dc2.CreateCompatibleDC(&ScrnDC);

    bmpDest.CreateCompatibleBitmap(&ScrnDC, nWidth, nHeight);

    ScrnDC.DeleteDC();

    CBitmap *pOldBmp1 = dc1.SelectObject(bmpOrig),
            *pOldBmp2 = dc2.SelectObject(bmpDest);

    dc2.StretchBlt(0, 0, nWidth, nHeight, &dc1, 0, 0, b.bmWidth, b.bmHeight, SRCCOPY);
   
    dc1.SelectObject(pOldBmp1);
    dc2.SelectObject(pOldBmp2);

    bmpOrig.Detach();

    ::DeleteObject(hSmallicon);
}
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Author Comment

by:yakky
ID: 2752138
Thank you very much indead

Yakky
0

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