static void update_picture (HWND wnd_image, int num_bitmap, int backcolor)
{
// Update picture with a background color
// The top left pixel color will be replaced with the background color
// And result will be send to the wnd_image control
// Destination

int idd_bitmap = 0;


switch(num_bitmap)

{
case 0: idd_bitmap=IDB_BITMAP; break;
case 1: idd_bitmap=IDB_BITMAP1;break;
case 2: idd_bitmap=IDB_BITMAP2;break;
case 3: idd_bitmap=IDB_BITMAP3;break;
case 4: idd_bitmap=IDB_BITMAP4;break;
case 5: idd_bitmap=IDB_BITMAP5;break;
case 6: idd_bitmap=IDB_BITMAP6;break;
case 7: idd_bitmap=IDB_BITMAP7;break;
case 8: idd_bitmap=IDB_BITMAP8;break;
case 9: idd_bitmap=IDB_BITMAP9;break;
case 10: idd_bitmap=IDC_TEST;break;
default: return;
}



bmp = (HBITMAP)uLoadImage(core_api::get_my_instance(),
MAKEINTRESOURCE(idd_bitmap), IMAGE_BITMAP, 20, 16, LR_DEFAULTCOLOR);

DestDC = ::GetDC(wnd_image);
// Source
HDC SourceDC = ::CreateCompatibleDC(DestDC);
// Associate source with bitmap
HBITMAP hOld = (HBITMAP)::SelectObject(SourceDC,bmp);
// Get bitmap info
GetObject(bmp, sizeof(bmpInfo), &bmpInfo);


//hRgn = CreateRectRgn(0,0,16,22);

DWORD dwLoopY = 0, dwLoopX = 0;
COLORREF crPixel = 0, tsPixel = 0;
tsPixel = ::GetPixel(SourceDC, 0, 0);

//Browse bitmap and replace color of the first pixel
//with our background color


for (dwLoopY = 0; dwLoopY < (DWORD)bmpInfo.bmHeight; dwLoopY++)
{
for (dwLoopX = 0; dwLoopX < (DWORD)bmpInfo.bmWidth; dwLoopX++)
{
crPixel = ::GetPixel(SourceDC, dwLoopX, dwLoopY);
if (!crPixel) continue;
if (crPixel==tsPixel)
::SetPixel(SourceDC, dwLoopX, dwLoopY, backcolor);
} // for
} // for

// Copy source to dest

::BitBlt(DestDC,0,0,bmpInfo.bmWidth,bmpInfo.bmHeight,SourceDC,0,0,SRCCOPY);
// House keeping
::SelectObject(SourceDC,hOld);
::ReleaseDC(wnd_image,SourceDC);
//ReleaseDC(wnd_image,DestDC);
//DeleteObject(bmp);


//InvalidateRgn(wnd_image, hRgn, false);
//SetWindowRgn(wnd_image, hRgn, TRUE);

return;
}