Coba ini, mudah2an bisa. Buat obyek CBitmapnya dari handle bitmap. Gambar obyek
CBitmap dengan prosedur biasa, yaitu dg fungsi BitBlt.
HBITMAP CreateBmpBackgroundTransparent(HBITMAP m_hBitmapColor, COLORREF
m_colorTransparent)
{
HDC m_hDcMem1, m_hDcMem2;
HBITMAP m_BitmapTransparent;
BITMAP bm;
//monochrome bitmap.
GetObject(m_hBitmapColor, sizeof(BITMAP), &bm);
m_BitmapTransparent = CreateBitmap(bm.bmWidth, bm.bmHeight, 1, 1, NULL);
//dc compatible with display driver
m_hDcMem1 = CreateCompatibleDC(0);
m_hDcMem2 = CreateCompatibleDC(0);
SelectBitmap(m_hDcMem1, m_hBitmapColor);
SelectBitmap(m_hDcMem2, m_BitmapTransparent);
//background colour want to be transparent
SetBkColor(m_hDcMem1, m_colorTransparent);
//copy the bits
BitBlt(m_hDcMem2, 0, 0, bm.bmWidth, bm.bmHeight, m_hDcMem1, 0, 0, SRCCOPY);
//set transparent color
BitBlt(m_hDcMem1, 0, 0, bm.bmWidth, bm.bmHeight, m_hDcMem2, 0, 0,
SRCINVERT);
//clean
DeleteDC(m_hDcMem1);
DeleteDC(m_hDcMem2);
return m_BitmapTransparent;
}
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