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Working with 32BPP DIBSection using HDC regardless of display settings

Last Modified: 2013-12-03

I have a DIB section, and I want to use standard GDI functions like LineTo, BitBlt, AlphaBlend etc. to work with it. Hovewer, I don't want to be dependent on current display settings. I would like to create DC not compatible with any device, but with memory, so I can use the full power of 32BPP bitmaps, when user has for example 256 color display mode. How to do that?

VC++ 6.0 (MFC Dialog App), SP6, PSDK Feb 2003, WinXP

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Do you have a surce code to work on?


Sure, here is the DIB section creation:

HDC        m_hDC;
DWORD     *m_pData;
HBITMAP    m_hOldBmp;

        // Create device context
        m_hDC = CreateCompatibleDC(NULL);
        if(m_hDC != NULL)
            // Init struct
            ZeroMemory(&m_tBI, sizeof(m_tBI));
            m_tBI.bmiHeader.biSize = sizeof(m_tBI.bmiHeader);
            m_tBI.bmiHeader.biPlanes = 1;
            m_tBI.bmiHeader.biBitCount = 32;
            m_tBI.bmiHeader.biCompression = BI_RGB;
            m_tBI.bmiHeader.biWidth = dwWidth;
            m_tBI.bmiHeader.biHeight = dwHeight;
            m_tBI.bmiHeader.biSizeImage = dwWidth * dwHeight * 4;

            // Create DIB section
            m_hDIB = CreateDIBSection(m_hDC, &m_tBI, DIB_RGB_COLORS, (LPVOID*)&m_pData, 0, 0);
            if(m_hDIB != NULL)
                // Select DIB into device context
                m_hOldBmp = (HBITMAP)SelectObject(m_hDC, m_hDIB);
                // Guarantee that GDI has completed any drawing to a bitmap
                // Save sizes
                m_dwWidth = dwWidth;
                m_dwHeight = dwHeight;
                // Validate image
                m_bValid = TRUE;
                // Return success
                return TRUE;
            // Error, so clean up

As you can see, I'm using current display DC. Hovewer, I want to not use such a DC, but 'memory' DC. I'm sure you understand.


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