Method GenerateBitmap

DuiLib/Core/UIRender.cpp:1898–1938

}

HBITMAP CRenderEngine::GenerateBitmap(CPaintManagerUI* pManager, CControlUI* pControl, RECT rc)
{
    int cx = rc.right - rc.left;
    int cy = rc.bottom - rc.top;

    HDC hPaintDC = ::CreateCompatibleDC(pManager->GetPaintDC());
    HBITMAP hPaintBitmap = ::CreateCompatibleBitmap(pManager->GetPaintDC(), rc.right, rc.bottom);
    ASSERT(hPaintDC);
    ASSERT(hPaintBitmap);
    HBITMAP hOldPaintBitmap = (HBITMAP) ::SelectObject(hPaintDC, hPaintBitmap);
    pControl->DoPaint(hPaintDC, rc);

    BITMAPINFO bmi = { 0 };
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth = cx;
    bmi.bmiHeader.biHeight = cy;
    bmi.bmiHeader.biPlanes = 1;
    bmi.bmiHeader.biBitCount = 32;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biSizeImage = cx * cy * sizeof(DWORD);
    LPDWORD pDest = NULL;
    HDC hCloneDC = ::CreateCompatibleDC(pManager->GetPaintDC());
    HBITMAP hBitmap = ::CreateDIBSection(pManager->GetPaintDC(), &bmi, DIB_RGB_COLORS, (LPVOID*) &pDest, NULL, 0);
    ASSERT(hCloneDC);
    ASSERT(hBitmap);
    if( hBitmap != NULL )
    {
        HBITMAP hOldBitmap = (HBITMAP) ::SelectObject(hCloneDC, hBitmap);
        ::BitBlt(hCloneDC, 0, 0, cx, cy, hPaintDC, rc.left, rc.top, SRCCOPY);
        ::SelectObject(hCloneDC, hOldBitmap);
        ::DeleteDC(hCloneDC);  
        ::GdiFlush();
    }

    // Cleanup
    ::SelectObject(hPaintDC, hOldPaintBitmap);
    ::DeleteObject(hPaintBitmap);
    ::DeleteDC(hPaintDC);

    return hBitmap;
}

SIZE CRenderEngine::GetTextSize( HDC hDC, CPaintManagerUI* pManager , LPCTSTR pstrText, int iFont, UINT uStyle )
{