/// <summary>
/// Override of PopulateSample to fill in the sample data
/// </summary>
/// <param name="ip">Pointer to the buffer to fill</param>
/// <param name="iSize">Size of the buffer</param>
/// <param name="iRead">Returns the number of buffer bytes used</param>
/// <returns>HRESULT for failure, S_Ok for success, or S_False for end of stream</returns>
override protected int PopulateSample(IntPtr ip, int iSize, out int iRead)
{
int hr = S_Ok;
// Send back MAXFRAMES frames, then end the stream
if (m_rtSampleTime < m_rtStopTime)
{
// It is *much* easier to draw in a Format32bppArgb buffer than a YUYV buffer. So,
// we draw in ARGB, and translate to the appropriate format.
Graphics g;
float sLeft;
float sTop;
SizeF d;
// The string to print
string sString = DateTime.Now.ToString("h:mm:ss");
sString = m_iFrameNumber.ToString();
// Get a graphics handle. We do the drawing on an ARGB32 bitmap, then
// convert the bitmap to the appropriate format (below)
g = Graphics.FromImage(m_bitmapOverlay);
try
{
// Clear the entire box to transparent
g.Clear(Color.Transparent);
// Prepare to put the specified string on the image
g.DrawRectangle(Pens.Blue, 0, 0, m_Width - 1, m_Height - 1);
g.DrawRectangle(Pens.Blue, 1, 1, m_Width - 3, m_Height - 3);
// Print the string in the box
d = g.MeasureString(sString, m_fontOverlay);
sLeft = (m_Width - d.Width) / 2;
sTop = (m_Height - d.Height) / 2;
g.DrawString(sString, m_fontOverlay, Brushes.Red, sLeft, sTop, StringFormat.GenericTypographic);
}
finally
{
g.Dispose();
}
// Convert the RGB bitmap to the appropriate format
iRead = ConvertImage.ToFormat((int)m_SubType, m_Width, m_Height, m_Stride, m_pData, ip);
Debug.Assert(iRead <= iSize);
}
else
{
hr = S_False; // End of stream
iRead = 0;
}
return(hr);
}
/// <summary>
/// Override of PopulateSample to fill in the sample data
/// </summary>
/// <param name="ip">Pointer to the buffer to fill</param>
/// <param name="iSize">Size of the buffer</param>
/// <param name="iRead">Returns the number of buffer bytes used</param>
/// <returns>HRESULT for failure, S_Ok for success, or S_False for end of stream</returns>
override protected int PopulateSample(IntPtr ip, int iSize, out int iRead)
{
int hr = S_Ok;
// Send back MAXFRAMES frames, then end the stream
if (m_rtSampleTime < m_rtStopTime)
{
// It is *much* easier to draw in a Format32bppArgb buffer than a YUYV, NV12, etc buffer. So,
// we draw in ARGB, then translate it to the appropriate format.
Graphics g;
Rectangle r1 = new Rectangle(0, 0, m_Width - 1, m_Height - 1);
// Get a graphics handle.
g = Graphics.FromImage(m_bitmapOverlay);
try
{
// Clear the entire box to the specified color
g.Clear(Color.FromArgb(255, m_r % 255, m_g % 255, m_b % 255));
// For testing purposes, sometimes it's useful to clear to a solid color
//g.Clear(Color.Red);
// Draw a pie chart segment on the background, simply because we can
g.FillPie(Brushes.BlueViolet, r1, m_iFrameNumber, (m_iFrameNumber + 123) % 360);
}
finally
{
g.Dispose();
}
// Convert the RGB bitmap to the appropriate output format
iRead = ConvertImage.ToFormat((int)m_SubType, m_Width, m_Height, m_Stride, m_pData, ip);
Debug.Assert(iRead <= iSize);
// Reset for the next call
m_r += 1;
m_g += 3;
m_b += 7;
}
else
{
hr = S_False; // End of stream
iRead = 0;
}
return(hr);
}