winctrl.cpp

basic class basic classbasic class

    *pVideoHeight = pVideoInfo->bmiHeader.biHeight;
    return NOERROR;
}


// This returns the current palette the video is using as an array allocated
// by the user. To remain consistent we use PALETTEENTRY fields to return the
// colours in rather than RGBQUADs that multimedia decided to use. The memory
// is allocated by the user so we simple copy each in turn. We check that the
// number of entries requested and the start position offset are both valid
// If the number of entries evaluates to zero then we return an S_FALSE code

STDMETHODIMP CBaseControlVideo::GetVideoPaletteEntries(long StartIndex,
                                                       long Entries,
                                                       long *pRetrieved,
                                                       long *pPalette)
{
    CheckPointer(pRetrieved,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    CMediaType MediaType;
    
    // Get the video format from the derived class
    
    VIDEOINFOHEADER *pVideoInfo = GetVideoFormat();
    if (pVideoInfo == NULL)
        return E_OUTOFMEMORY;
    BITMAPINFOHEADER *pHeader = HEADER(pVideoInfo);
    
    // Is the current format palettised
    
    if (PALETTISED(pVideoInfo) == FALSE) {
        *pRetrieved = 0;
        return VFW_E_NO_PALETTE_AVAILABLE;
    }
    
    // Do they just want to know how many are available
    
    if (pPalette == NULL) {
        *pRetrieved = pHeader->biClrUsed;
        return NOERROR;
    }
    
    // Make sure the start position is a valid offset
    
    if (StartIndex >= (LONG) pHeader->biClrUsed || StartIndex < 0) {
        *pRetrieved = 0;
        return E_INVALIDARG;
    }
    
    // Correct the number we can retrieve
    
    LONG Available = (LONG) pHeader->biClrUsed - StartIndex;
    *pRetrieved = max(0,min(Available,Entries));
    if (*pRetrieved == 0) {
        return S_FALSE;
    }
    
    // Copy the palette entries to the output buffer
    
    PALETTEENTRY *pEntries = (PALETTEENTRY *) pPalette;
    RGBQUAD *pColours = COLORS(pVideoInfo) + StartIndex;
    
    for (LONG Count = 0;Count < *pRetrieved;Count++) {
        pEntries[Count].peRed = pColours[Count].rgbRed;
        pEntries[Count].peGreen = pColours[Count].rgbGreen;
        pEntries[Count].peBlue = pColours[Count].rgbBlue;
        pEntries[Count].peFlags = 0;
    }
    return NOERROR;
}


// This returns the current video dimensions as a method rather than a number
// of individual property get calls. For the same reasons as said before we
// cannot access the renderer media type directly as the window object thread
// may be updating it since dynamic format changes may change these values

STDMETHODIMP CBaseControlVideo::GetVideoSize(long *pWidth,long *pHeight)
{
    CheckPointer(pWidth,E_POINTER);
    CheckPointer(pHeight,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    
    // Get the video format from the derived class
    VIDEOINFOHEADER *pVideoInfo = GetVideoFormat();
    if (pVideoInfo == NULL)
        return E_OUTOFMEMORY;
    *pWidth = pVideoInfo->bmiHeader.biWidth;
    *pHeight = pVideoInfo->bmiHeader.biHeight;
    return NOERROR;
}


// Set the source video rectangle as left,top,right and bottom coordinates
// rather than left,top,width and height as per OLE automation interfaces
// Then pass the rectangle on to the window object to set the source

STDMETHODIMP
CBaseControlVideo::SetSourcePosition(long Left,long Top,long Width,long Height)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    SourceRect.left = Left;
    SourceRect.top = Top;
    SourceRect.right = Left + Width;
    SourceRect.bottom = Top + Height;
    
    // Check the source rectangle is valid
    
    HRESULT hr = CheckSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the source rectangle
    
    hr = SetSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the source rectangle in left,top,width and height rather than the
// left,top,right and bottom values that RECT uses (and which the window
// object returns through GetSourceRect) which requires a little work

STDMETHODIMP
CBaseControlVideo::GetSourcePosition(long *pLeft,long *pTop,long *pWidth,long *pHeight)
{
    // Should check the pointers are non NULL
    
    CheckPointer(pLeft,E_POINTER);
    CheckPointer(pTop,E_POINTER);
    CheckPointer(pWidth,E_POINTER);
    CheckPointer(pHeight,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    RECT SourceRect;
    
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    GetSourceRect(&SourceRect);
    
    *pLeft = SourceRect.left;
    *pTop = SourceRect.top;
    *pWidth = WIDTH(&SourceRect);
    *pHeight = HEIGHT(&SourceRect);
    
    return NOERROR;
}


// Set the video destination as left,top,right and bottom coordinates rather
// than the left,top,width and height uses as per OLE automation interfaces
// Then pass the rectangle on to the window object to set the destination

STDMETHODIMP
CBaseControlVideo::SetDestinationPosition(long Left,long Top,long Width,long Height)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT DestinationRect;
    
    DestinationRect.left = Left;
    DestinationRect.top = Top;
    DestinationRect.right = Left + Width;
    DestinationRect.bottom = Top + Height;
    
    // Check the target rectangle is valid
    
    HRESULT hr = CheckTargetRect(&DestinationRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the new target rectangle
    
    hr = SetTargetRect(&DestinationRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the destination rectangle in left,top,width and height rather than
// the left,top,right and bottom values that RECT uses (and which the window
// object returns through GetDestinationRect) which requires a little work

STDMETHODIMP
CBaseControlVideo::GetDestinationPosition(long *pLeft,long *pTop,long *pWidth,long *pHeight)
{
    // Should check the pointers are not NULL
    
    CheckPointer(pLeft,E_POINTER);
    CheckPointer(pTop,E_POINTER);
    CheckPointer(pWidth,E_POINTER);
    CheckPointer(pHeight,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    RECT DestinationRect;
    
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    GetTargetRect(&DestinationRect);
    
    *pLeft = DestinationRect.left;
    *pTop = DestinationRect.top;
    *pWidth = WIDTH(&DestinationRect);
    *pHeight = HEIGHT(&DestinationRect);
    
    return NOERROR;
}


// Set the source left position, the source rectangle we get back from the
// window object is a true rectangle in left,top,right and bottom positions
// so all we have to do is to update the left position and pass it back. We
// must keep the current width constant when we're updating this property

STDMETHODIMP CBaseControlVideo::put_SourceLeft(long SourceLeft)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    GetSourceRect(&SourceRect);
    SourceRect.right = SourceLeft + WIDTH(&SourceRect);
    SourceRect.left = SourceLeft;
    
    // Check the source rectangle is valid
    
    HRESULT hr = CheckSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the source rectangle
    
    hr = SetSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the current left source video position

STDMETHODIMP CBaseControlVideo::get_SourceLeft(long *pSourceLeft)
{
    CheckPointer(pSourceLeft,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    
    GetSourceRect(&SourceRect);
    *pSourceLeft = SourceRect.left;
    return NOERROR;
}


// Set the source width, we get the current source rectangle and then update
// the right position to be the left position (thereby keeping it constant)
// plus the new source width we are passed in (it expands to the right)

STDMETHODIMP CBaseControlVideo::put_SourceWidth(long SourceWidth)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    GetSourceRect(&SourceRect);
    SourceRect.right = SourceRect.left + SourceWidth;
    
    // Check the source rectangle is valid
    
    HRESULT hr = CheckSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the source rectangle
    
    hr = SetSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the current source width

STDMETHODIMP CBaseControlVideo::get_SourceWidth(long *pSourceWidth)
{
    CheckPointer(pSourceWidth,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    
    GetSourceRect(&SourceRect);
    *pSourceWidth = WIDTH(&SourceRect);
    return NOERROR;
}


// Set the source top position - changing this property does not affect the
// current source height. So changing this shunts the source rectangle up and
// down appropriately. Changing the height complements this functionality by
// keeping the top position constant and simply changing the source height

STDMETHODIMP CBaseControlVideo::put_SourceTop(long SourceTop)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    GetSourceRect(&SourceRect);
    SourceRect.bottom = SourceTop + HEIGHT(&SourceRect);
    SourceRect.top = SourceTop;
    
    // Check the source rectangle is valid
    
    HRESULT hr = CheckSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the source rectangle
    
    hr = SetSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the current top position

STDMETHODIMP CBaseControlVideo::get_SourceTop(long *pSourceTop)
{
    CheckPointer(pSourceTop,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    
    GetSourceRect(&SourceRect);
    *pSourceTop = SourceRect.top;
    return NOERROR;
}


// Set the source height

STDMETHODIMP CBaseControlVideo::put_SourceHeight(long SourceHeight)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    GetSourceRect(&SourceRect);
    SourceRect.bottom = SourceRect.top + SourceHeight;
    
    // Check the source rectangle is valid
    
    HRESULT hr = CheckSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    
    // Now set the source rectangle
    
    hr = SetSourceRect(&SourceRect);
    if (FAILED(hr)) {
        return hr;
    }
    return OnUpdateRectangles();
}


// Return the current source height

STDMETHODIMP CBaseControlVideo::get_SourceHeight(long *pSourceHeight)
{
    CheckPointer(pSourceHeight,E_POINTER);
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);
    CAutoLock cInterfaceLock(m_pInterfaceLock);
    RECT SourceRect;
    
    GetSourceRect(&SourceRect);
    *pSourceHeight = HEIGHT(&SourceRect);
    return NOERROR;
}


// Set the target left position, the target rectangle we get back from the
// window object is a true rectangle in left,top,right and bottom positions
// so all we have to do is to update the left position and pass it back. We
// must keep the current width constant when we're updating this property

STDMETHODIMP CBaseControlVideo::put_DestinationLeft(long DestinationLeft)
{
    CheckConnected(m_pPin,VFW_E_NOT_CONNECTED);