Drawing Text to a decompressed video frame

[PetrSM]

I'm trying to draw text to a DIB

void CRenderer::RenderScreen(BYTE* data) 
{

    BITMAPINFOHEADER* pbitmapInfoHeader = (BITMAPINFOHEADER*)data;
    (HBITMAP*)(data+sizeof(BITMAPINFOHEADER));

    const char *DemoText = "ABCD0123456789\0"; 
    RECT TextArea = {400, 400, 400, 400}; 
    HFONT fontHandle = CreateFont(60, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_OUTLINE_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY, VARIABLE_PITCH || FF_DONTCARE, "Arial\0");

    HDC hdc = CreateDC(m_DispDevice.DeviceName,NULL,NULL,NULL);   // creates a device context (DC) for a device ("\\.\DISPLAY2")

    SelectObject ( hdc, fontHandle);     
    SetTextColor( hdc, RGB (128, 128, 128)); 
    SetBkMode( hdc, TRANSPARENT);

    DrawDibDraw(m_hDrwScr,hdc,m_ptScrPos.x,m_ptScrPos.y,-1,-1,pbitmapInfoHeader,phbitmap, 0,0,pbitmapInfoHeader->biWidth,pbitmapInfoHeader->biHeight,0);            // draws a DIB to the screen

    DrawTextA ( hdc, DemoText, 14, &TextArea, DT_LEFT | DT_SINGLELINE | DT_NOCLIP);                        // draws formatted text in the specified rectangle 
    DeleteObject( fontHandle); 
    DeleteDC(hdc); 

};

(data=(BYTE*)AVIStreamGetFrame(m_pGetFrame,Num);)

the code is working, but text is flicker because i can't draw text to decompresed frame and after this draws a DIB to the screen

Any ideas?

thanks

[Marc G]

How are you decompressing the video frames?
If you are using the Media Foundation SDK, take a look at the example here: http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

[OReubens]

if you only want the visual appearance of text on top of video but don't need the actual text "in" the bitmap, then you could also have a look at window layering. You basically create a new window place it on top of the videstream, make the window transparent and then just draw what you need to draw (transparently) onto your own window. The Windows WDM will then be responsible for proper painting of everything.


see http://msdn.microsoft.com/en-us/libr...px#layered_win